From 3740232925a3fee75f47ba51343d695b39d9cee6 Mon Sep 17 00:00:00 2001
From: Martin Kelly <martin@martingkelly.com>
Date: Sat, 2 Feb 2019 13:55:56 -0800
Subject: iio:bmi160: add SPDX identifiers

Add SPDX identifiers (GPL 2) for the BMI160 driver. bmi160.h had an
identifier, but the other files did not.

Signed-off-by: Martin Kelly <martin@martingkelly.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
---
 drivers/iio/imu/bmi160/bmi160_core.c | 5 +----
 drivers/iio/imu/bmi160/bmi160_i2c.c  | 5 +----
 drivers/iio/imu/bmi160/bmi160_spi.c  | 4 +---
 3 files changed, 3 insertions(+), 11 deletions(-)

(limited to 'drivers/iio')

diff --git a/drivers/iio/imu/bmi160/bmi160_core.c b/drivers/iio/imu/bmi160/bmi160_core.c
index b10330b0f93f..ce61026d84c3 100644
--- a/drivers/iio/imu/bmi160/bmi160_core.c
+++ b/drivers/iio/imu/bmi160/bmi160_core.c
@@ -1,12 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * BMI160 - Bosch IMU (accel, gyro plus external magnetometer)
  *
  * Copyright (c) 2016, Intel Corporation.
  *
- * This file is subject to the terms and conditions of version 2 of
- * the GNU General Public License.  See the file COPYING in the main
- * directory of this archive for more details.
- *
  * IIO core driver for BMI160, with support for I2C/SPI busses
  *
  * TODO: magnetometer, interrupts, hardware FIFO
diff --git a/drivers/iio/imu/bmi160/bmi160_i2c.c b/drivers/iio/imu/bmi160/bmi160_i2c.c
index 5b1f7e6af651..e36f5e82d400 100644
--- a/drivers/iio/imu/bmi160/bmi160_i2c.c
+++ b/drivers/iio/imu/bmi160/bmi160_i2c.c
@@ -1,12 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * BMI160 - Bosch IMU, I2C bits
  *
  * Copyright (c) 2016, Intel Corporation.
  *
- * This file is subject to the terms and conditions of version 2 of
- * the GNU General Public License.  See the file COPYING in the main
- * directory of this archive for more details.
- *
  * 7-bit I2C slave address is:
  *      - 0x68 if SDO is pulled to GND
  *      - 0x69 if SDO is pulled to VDDIO
diff --git a/drivers/iio/imu/bmi160/bmi160_spi.c b/drivers/iio/imu/bmi160/bmi160_spi.c
index e521ad14eeac..c19e3df35559 100644
--- a/drivers/iio/imu/bmi160/bmi160_spi.c
+++ b/drivers/iio/imu/bmi160/bmi160_spi.c
@@ -1,11 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * BMI160 - Bosch IMU, SPI bits
  *
  * Copyright (c) 2016, Intel Corporation.
  *
- * This file is subject to the terms and conditions of version 2 of
- * the GNU General Public License.  See the file COPYING in the main
- * directory of this archive for more details.
  */
 #include <linux/acpi.h>
 #include <linux/module.h>
-- 
cgit v1.2.3-58-ga151


From 895bf81e6bbfbcd37442aca87ad6ae44be34c54d Mon Sep 17 00:00:00 2001
From: Martin Kelly <martin@martingkelly.com>
Date: Sat, 2 Feb 2019 13:55:57 -0800
Subject: iio:bmi160: add drdy interrupt support

Add interrupt support for the data ready signal on the BMI160, which fires
an interrupt whenever new accelerometer/gyroscope data is ready to read.

Signed-off-by: Martin Kelly <martin@martingkelly.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
---
 drivers/iio/imu/bmi160/bmi160.h      |  11 ++
 drivers/iio/imu/bmi160/bmi160_core.c | 270 ++++++++++++++++++++++++++++++++++-
 2 files changed, 278 insertions(+), 3 deletions(-)

(limited to 'drivers/iio')

diff --git a/drivers/iio/imu/bmi160/bmi160.h b/drivers/iio/imu/bmi160/bmi160.h
index 2351049d930b..621f5309d735 100644
--- a/drivers/iio/imu/bmi160/bmi160.h
+++ b/drivers/iio/imu/bmi160/bmi160.h
@@ -2,9 +2,20 @@
 #ifndef BMI160_H_
 #define BMI160_H_
 
+#include <linux/iio/iio.h>
+
+struct bmi160_data {
+	struct regmap *regmap;
+	struct iio_trigger *trig;
+};
+
 extern const struct regmap_config bmi160_regmap_config;
 
 int bmi160_core_probe(struct device *dev, struct regmap *regmap,
 		      const char *name, bool use_spi);
 
+int bmi160_enable_irq(struct regmap *regmap, bool enable);
+
+int bmi160_probe_trigger(struct iio_dev *indio_dev, int irq, u32 irq_type);
+
 #endif  /* BMI160_H_ */
diff --git a/drivers/iio/imu/bmi160/bmi160_core.c b/drivers/iio/imu/bmi160/bmi160_core.c
index ce61026d84c3..007f7c532ac4 100644
--- a/drivers/iio/imu/bmi160/bmi160_core.c
+++ b/drivers/iio/imu/bmi160/bmi160_core.c
@@ -3,21 +3,25 @@
  * BMI160 - Bosch IMU (accel, gyro plus external magnetometer)
  *
  * Copyright (c) 2016, Intel Corporation.
+ * Copyright (c) 2019, Martin Kelly.
  *
  * IIO core driver for BMI160, with support for I2C/SPI busses
  *
- * TODO: magnetometer, interrupts, hardware FIFO
+ * TODO: magnetometer, hardware FIFO
  */
 #include <linux/module.h>
 #include <linux/regmap.h>
 #include <linux/acpi.h>
 #include <linux/delay.h>
+#include <linux/irq.h>
+#include <linux/of_irq.h>
 
 #include <linux/iio/iio.h>
 #include <linux/iio/triggered_buffer.h>
 #include <linux/iio/trigger_consumer.h>
 #include <linux/iio/buffer.h>
 #include <linux/iio/sysfs.h>
+#include <linux/iio/trigger.h>
 
 #include "bmi160.h"
 
@@ -61,8 +65,32 @@
 #define BMI160_CMD_GYRO_PM_FAST_STARTUP	0x17
 #define BMI160_CMD_SOFTRESET		0xB6
 
+#define BMI160_REG_INT_EN		0x51
+#define BMI160_DRDY_INT_EN		BIT(4)
+
+#define BMI160_REG_INT_OUT_CTRL		0x53
+#define BMI160_INT_OUT_CTRL_MASK	0x0f
+#define BMI160_INT1_OUT_CTRL_SHIFT	0
+#define BMI160_INT2_OUT_CTRL_SHIFT	4
+#define BMI160_EDGE_TRIGGERED		BIT(0)
+#define BMI160_ACTIVE_HIGH		BIT(1)
+#define BMI160_OPEN_DRAIN		BIT(2)
+#define BMI160_OUTPUT_EN		BIT(3)
+
+#define BMI160_REG_INT_LATCH		0x54
+#define BMI160_INT1_LATCH_MASK		BIT(4)
+#define BMI160_INT2_LATCH_MASK		BIT(5)
+
+/* INT1 and INT2 are in the opposite order as in INT_OUT_CTRL! */
+#define BMI160_REG_INT_MAP		0x56
+#define BMI160_INT1_MAP_DRDY_EN		0x80
+#define BMI160_INT2_MAP_DRDY_EN		0x08
+
 #define BMI160_REG_DUMMY		0x7F
 
+#define BMI160_NORMAL_WRITE_USLEEP	2
+#define BMI160_SUSPENDED_WRITE_USLEEP	450
+
 #define BMI160_ACCEL_PMU_MIN_USLEEP	3800
 #define BMI160_GYRO_PMU_MIN_USLEEP	80000
 #define BMI160_SOFTRESET_USLEEP		1000
@@ -105,8 +133,9 @@ enum bmi160_sensor_type {
 	BMI160_NUM_SENSORS /* must be last */
 };
 
-struct bmi160_data {
-	struct regmap *regmap;
+enum bmi160_int_pin {
+	BMI160_PIN_INT1,
+	BMI160_PIN_INT2
 };
 
 const struct regmap_config bmi160_regmap_config = {
@@ -495,6 +524,186 @@ static const char *bmi160_match_acpi_device(struct device *dev)
 	return dev_name(dev);
 }
 
+static int bmi160_write_conf_reg(struct regmap *regmap, unsigned int reg,
+				 unsigned int mask, unsigned int bits,
+				 unsigned int write_usleep)
+{
+	int ret;
+	unsigned int val;
+
+	ret = regmap_read(regmap, reg, &val);
+	if (ret)
+		return ret;
+
+	val = (val & ~mask) | bits;
+
+	ret = regmap_write(regmap, reg, val);
+	if (ret)
+		return ret;
+
+	/*
+	 * We need to wait after writing before we can write again. See the
+	 * datasheet, page 93.
+	 */
+	usleep_range(write_usleep, write_usleep + 1000);
+
+	return 0;
+}
+
+static int bmi160_config_pin(struct regmap *regmap, enum bmi160_int_pin pin,
+			     bool open_drain, u8 irq_mask,
+			     unsigned long write_usleep)
+{
+	int ret;
+	struct device *dev = regmap_get_device(regmap);
+	u8 int_out_ctrl_shift;
+	u8 int_latch_mask;
+	u8 int_map_mask;
+	u8 int_out_ctrl_mask;
+	u8 int_out_ctrl_bits;
+	const char *pin_name;
+
+	switch (pin) {
+	case BMI160_PIN_INT1:
+		int_out_ctrl_shift = BMI160_INT1_OUT_CTRL_SHIFT;
+		int_latch_mask = BMI160_INT1_LATCH_MASK;
+		int_map_mask = BMI160_INT1_MAP_DRDY_EN;
+		break;
+	case BMI160_PIN_INT2:
+		int_out_ctrl_shift = BMI160_INT2_OUT_CTRL_SHIFT;
+		int_latch_mask = BMI160_INT2_LATCH_MASK;
+		int_map_mask = BMI160_INT2_MAP_DRDY_EN;
+		break;
+	}
+	int_out_ctrl_mask = BMI160_INT_OUT_CTRL_MASK << int_out_ctrl_shift;
+
+	/*
+	 * Enable the requested pin with the right settings:
+	 * - Push-pull/open-drain
+	 * - Active low/high
+	 * - Edge/level triggered
+	 */
+	int_out_ctrl_bits = BMI160_OUTPUT_EN;
+	if (open_drain)
+		/* Default is push-pull. */
+		int_out_ctrl_bits |= BMI160_OPEN_DRAIN;
+	int_out_ctrl_bits |= irq_mask;
+	int_out_ctrl_bits <<= int_out_ctrl_shift;
+
+	ret = bmi160_write_conf_reg(regmap, BMI160_REG_INT_OUT_CTRL,
+				    int_out_ctrl_mask, int_out_ctrl_bits,
+				    write_usleep);
+	if (ret)
+		return ret;
+
+	/* Set the pin to input mode with no latching. */
+	ret = bmi160_write_conf_reg(regmap, BMI160_REG_INT_LATCH,
+				    int_latch_mask, int_latch_mask,
+				    write_usleep);
+	if (ret)
+		return ret;
+
+	/* Map interrupts to the requested pin. */
+	ret = bmi160_write_conf_reg(regmap, BMI160_REG_INT_MAP,
+				    int_map_mask, int_map_mask,
+				    write_usleep);
+	if (ret) {
+		switch (pin) {
+		case BMI160_PIN_INT1:
+			pin_name = "INT1";
+			break;
+		case BMI160_PIN_INT2:
+			pin_name = "INT2";
+			break;
+		}
+		dev_err(dev, "Failed to configure %s IRQ pin", pin_name);
+	}
+
+	return ret;
+}
+
+int bmi160_enable_irq(struct regmap *regmap, bool enable)
+{
+	unsigned int enable_bit = 0;
+
+	if (enable)
+		enable_bit = BMI160_DRDY_INT_EN;
+
+	return bmi160_write_conf_reg(regmap, BMI160_REG_INT_EN,
+				     BMI160_DRDY_INT_EN, enable_bit,
+				     BMI160_NORMAL_WRITE_USLEEP);
+}
+EXPORT_SYMBOL(bmi160_enable_irq);
+
+static int bmi160_get_irq(struct device_node *of_node, enum bmi160_int_pin *pin)
+{
+	int irq;
+
+	/* Use INT1 if possible, otherwise fall back to INT2. */
+	irq = of_irq_get_byname(of_node, "INT1");
+	if (irq > 0) {
+		*pin = BMI160_PIN_INT1;
+		return irq;
+	}
+
+	irq = of_irq_get_byname(of_node, "INT2");
+	if (irq > 0)
+		*pin = BMI160_PIN_INT2;
+
+	return irq;
+}
+
+static int bmi160_config_device_irq(struct iio_dev *indio_dev, int irq_type,
+				    enum bmi160_int_pin pin)
+{
+	bool open_drain;
+	u8 irq_mask;
+	struct bmi160_data *data = iio_priv(indio_dev);
+	struct device *dev = regmap_get_device(data->regmap);
+
+	/* Level-triggered, active-low is the default if we set all zeroes. */
+	if (irq_type == IRQF_TRIGGER_RISING)
+		irq_mask = BMI160_ACTIVE_HIGH | BMI160_EDGE_TRIGGERED;
+	else if (irq_type == IRQF_TRIGGER_FALLING)
+		irq_mask = BMI160_EDGE_TRIGGERED;
+	else if (irq_type == IRQF_TRIGGER_HIGH)
+		irq_mask = BMI160_ACTIVE_HIGH;
+	else if (irq_type == IRQF_TRIGGER_LOW)
+		irq_mask = 0;
+	else {
+		dev_err(&indio_dev->dev,
+			"Invalid interrupt type 0x%x specified\n", irq_type);
+		return -EINVAL;
+	}
+
+	open_drain = of_property_read_bool(dev->of_node, "drive-open-drain");
+
+	return bmi160_config_pin(data->regmap, pin, open_drain, irq_mask,
+				 BMI160_NORMAL_WRITE_USLEEP);
+}
+
+static int bmi160_setup_irq(struct iio_dev *indio_dev, int irq,
+			    enum bmi160_int_pin pin)
+{
+	struct irq_data *desc;
+	u32 irq_type;
+	int ret;
+
+	desc = irq_get_irq_data(irq);
+	if (!desc) {
+		dev_err(&indio_dev->dev, "Could not find IRQ %d\n", irq);
+		return -EINVAL;
+	}
+
+	irq_type = irqd_get_trigger_type(desc);
+
+	ret = bmi160_config_device_irq(indio_dev, irq_type, pin);
+	if (ret)
+		return ret;
+
+	return bmi160_probe_trigger(indio_dev, irq, irq_type);
+}
+
 static int bmi160_chip_init(struct bmi160_data *data, bool use_spi)
 {
 	int ret;
@@ -539,6 +748,49 @@ static int bmi160_chip_init(struct bmi160_data *data, bool use_spi)
 	return 0;
 }
 
+static int bmi160_data_rdy_trigger_set_state(struct iio_trigger *trig,
+					     bool enable)
+{
+	struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
+	struct bmi160_data *data = iio_priv(indio_dev);
+
+	return bmi160_enable_irq(data->regmap, enable);
+}
+
+static const struct iio_trigger_ops bmi160_trigger_ops = {
+	.set_trigger_state = &bmi160_data_rdy_trigger_set_state,
+};
+
+int bmi160_probe_trigger(struct iio_dev *indio_dev, int irq, u32 irq_type)
+{
+	struct bmi160_data *data = iio_priv(indio_dev);
+	int ret;
+
+	data->trig = devm_iio_trigger_alloc(&indio_dev->dev, "%s-dev%d",
+					    indio_dev->name, indio_dev->id);
+
+	if (data->trig == NULL)
+		return -ENOMEM;
+
+	ret = devm_request_irq(&indio_dev->dev, irq,
+			       &iio_trigger_generic_data_rdy_poll,
+			       irq_type, "bmi160", data->trig);
+	if (ret < 0)
+		return ret;
+
+	data->trig->dev.parent = regmap_get_device(data->regmap);
+	data->trig->ops = &bmi160_trigger_ops;
+	iio_trigger_set_drvdata(data->trig, indio_dev);
+
+	ret = devm_iio_trigger_register(&indio_dev->dev, data->trig);
+	if (ret)
+		return ret;
+
+	indio_dev->trig = iio_trigger_get(data->trig);
+
+	return 0;
+}
+
 static void bmi160_chip_uninit(void *data)
 {
 	struct bmi160_data *bmi_data = data;
@@ -552,6 +804,8 @@ int bmi160_core_probe(struct device *dev, struct regmap *regmap,
 {
 	struct iio_dev *indio_dev;
 	struct bmi160_data *data;
+	int irq;
+	enum bmi160_int_pin int_pin;
 	int ret;
 
 	indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
@@ -585,6 +839,16 @@ int bmi160_core_probe(struct device *dev, struct regmap *regmap,
 	if (ret < 0)
 		return ret;
 
+	irq = bmi160_get_irq(dev->of_node, &int_pin);
+	if (irq > 0) {
+		ret = bmi160_setup_irq(indio_dev, irq, int_pin);
+		if (ret)
+			dev_err(&indio_dev->dev, "Failed to setup IRQ %d\n",
+				irq);
+	} else {
+		dev_info(&indio_dev->dev, "Not setting up IRQ trigger\n");
+	}
+
 	ret = devm_iio_device_register(dev, indio_dev);
 	if (ret < 0)
 		return ret;
-- 
cgit v1.2.3-58-ga151


From 0a3f50e4d698e3d46ce10171dcd076c927bb60a8 Mon Sep 17 00:00:00 2001
From: Martin Kelly <martin@martingkelly.com>
Date: Sat, 2 Feb 2019 13:56:00 -0800
Subject: iio:bmi160: use iio_pollfunc_store_time

Currently, we snap the timestamp after reading from the buffer and
processing the event. When the IIO poll function is triggered by an
interrupt,  we can get a slightly more accurate timestamp by snapping it
prior to reading the data, since the data was already generated prior to
entering the trigger handler. This is not going to make a huge difference,
but we might as well improve slightly.

Do this by using iio_pollfunc_store_time as other drivers do.

Signed-off-by: Martin Kelly <martin@martingkelly.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
---
 drivers/iio/imu/bmi160/bmi160_core.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

(limited to 'drivers/iio')

diff --git a/drivers/iio/imu/bmi160/bmi160_core.c b/drivers/iio/imu/bmi160/bmi160_core.c
index 007f7c532ac4..f3c5b86a281e 100644
--- a/drivers/iio/imu/bmi160/bmi160_core.c
+++ b/drivers/iio/imu/bmi160/bmi160_core.c
@@ -425,8 +425,7 @@ static irqreturn_t bmi160_trigger_handler(int irq, void *p)
 		buf[j++] = sample;
 	}
 
-	iio_push_to_buffers_with_timestamp(indio_dev, buf,
-					   iio_get_time_ns(indio_dev));
+	iio_push_to_buffers_with_timestamp(indio_dev, buf, pf->timestamp);
 done:
 	iio_trigger_notify_done(indio_dev->trig);
 	return IRQ_HANDLED;
@@ -834,7 +833,8 @@ int bmi160_core_probe(struct device *dev, struct regmap *regmap,
 	indio_dev->modes = INDIO_DIRECT_MODE;
 	indio_dev->info = &bmi160_info;
 
-	ret = devm_iio_triggered_buffer_setup(dev, indio_dev, NULL,
+	ret = devm_iio_triggered_buffer_setup(dev, indio_dev,
+					      iio_pollfunc_store_time,
 					      bmi160_trigger_handler, NULL);
 	if (ret < 0)
 		return ret;
-- 
cgit v1.2.3-58-ga151


From 94edaac707e2882513b8b8b83482e4cba77863e7 Mon Sep 17 00:00:00 2001
From: Martin Kelly <martin@martingkelly.com>
Date: Sat, 2 Feb 2019 13:56:01 -0800
Subject: iio:bmi160: use if (ret) instead of if (ret < 0)

We are using "if (ret < 0)" in many places in which the function returns 0
on success. Use "if (ret)" instead for better clarity and correctness.

Signed-off-by: Martin Kelly <martin@martingkelly.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
---
 drivers/iio/imu/bmi160/bmi160_core.c | 40 ++++++++++++++++--------------------
 1 file changed, 18 insertions(+), 22 deletions(-)

(limited to 'drivers/iio')

diff --git a/drivers/iio/imu/bmi160/bmi160_core.c b/drivers/iio/imu/bmi160/bmi160_core.c
index f3c5b86a281e..6af65d6f1d28 100644
--- a/drivers/iio/imu/bmi160/bmi160_core.c
+++ b/drivers/iio/imu/bmi160/bmi160_core.c
@@ -299,7 +299,7 @@ int bmi160_set_mode(struct bmi160_data *data, enum bmi160_sensor_type t,
 		cmd = bmi160_regs[t].pmu_cmd_suspend;
 
 	ret = regmap_write(data->regmap, BMI160_REG_CMD, cmd);
-	if (ret < 0)
+	if (ret)
 		return ret;
 
 	usleep_range(bmi160_pmu_time[t], bmi160_pmu_time[t] + 1000);
@@ -331,7 +331,7 @@ int bmi160_get_scale(struct bmi160_data *data, enum bmi160_sensor_type t,
 	int i, ret, val;
 
 	ret = regmap_read(data->regmap, bmi160_regs[t].range, &val);
-	if (ret < 0)
+	if (ret)
 		return ret;
 
 	for (i = 0; i < bmi160_scale_table[t].num; i++)
@@ -354,7 +354,7 @@ static int bmi160_get_data(struct bmi160_data *data, int chan_type,
 	reg = bmi160_regs[t].data + (axis - IIO_MOD_X) * sizeof(sample);
 
 	ret = regmap_bulk_read(data->regmap, reg, &sample, sizeof(sample));
-	if (ret < 0)
+	if (ret)
 		return ret;
 
 	*val = sign_extend32(le16_to_cpu(sample), 15);
@@ -388,7 +388,7 @@ static int bmi160_get_odr(struct bmi160_data *data, enum bmi160_sensor_type t,
 	int i, val, ret;
 
 	ret = regmap_read(data->regmap, bmi160_regs[t].config, &val);
-	if (ret < 0)
+	if (ret)
 		return ret;
 
 	val &= bmi160_regs[t].config_odr_mask;
@@ -420,7 +420,7 @@ static irqreturn_t bmi160_trigger_handler(int irq, void *p)
 			 indio_dev->masklength) {
 		ret = regmap_bulk_read(data->regmap, base + i * sizeof(sample),
 				       &sample, sizeof(sample));
-		if (ret < 0)
+		if (ret)
 			goto done;
 		buf[j++] = sample;
 	}
@@ -441,18 +441,18 @@ static int bmi160_read_raw(struct iio_dev *indio_dev,
 	switch (mask) {
 	case IIO_CHAN_INFO_RAW:
 		ret = bmi160_get_data(data, chan->type, chan->channel2, val);
-		if (ret < 0)
+		if (ret)
 			return ret;
 		return IIO_VAL_INT;
 	case IIO_CHAN_INFO_SCALE:
 		*val = 0;
 		ret = bmi160_get_scale(data,
 				       bmi160_to_sensor(chan->type), val2);
-		return ret < 0 ? ret : IIO_VAL_INT_PLUS_MICRO;
+		return ret ? ret : IIO_VAL_INT_PLUS_MICRO;
 	case IIO_CHAN_INFO_SAMP_FREQ:
 		ret = bmi160_get_odr(data, bmi160_to_sensor(chan->type),
 				     val, val2);
-		return ret < 0 ? ret : IIO_VAL_INT_PLUS_MICRO;
+		return ret ? ret : IIO_VAL_INT_PLUS_MICRO;
 	default:
 		return -EINVAL;
 	}
@@ -710,7 +710,7 @@ static int bmi160_chip_init(struct bmi160_data *data, bool use_spi)
 	struct device *dev = regmap_get_device(data->regmap);
 
 	ret = regmap_write(data->regmap, BMI160_REG_CMD, BMI160_CMD_SOFTRESET);
-	if (ret < 0)
+	if (ret)
 		return ret;
 
 	usleep_range(BMI160_SOFTRESET_USLEEP, BMI160_SOFTRESET_USLEEP + 1);
@@ -721,12 +721,12 @@ static int bmi160_chip_init(struct bmi160_data *data, bool use_spi)
 	 */
 	if (use_spi) {
 		ret = regmap_read(data->regmap, BMI160_REG_DUMMY, &val);
-		if (ret < 0)
+		if (ret)
 			return ret;
 	}
 
 	ret = regmap_read(data->regmap, BMI160_REG_CHIP_ID, &val);
-	if (ret < 0) {
+	if (ret) {
 		dev_err(dev, "Error reading chip id\n");
 		return ret;
 	}
@@ -737,11 +737,11 @@ static int bmi160_chip_init(struct bmi160_data *data, bool use_spi)
 	}
 
 	ret = bmi160_set_mode(data, BMI160_ACCEL, true);
-	if (ret < 0)
+	if (ret)
 		return ret;
 
 	ret = bmi160_set_mode(data, BMI160_GYRO, true);
-	if (ret < 0)
+	if (ret)
 		return ret;
 
 	return 0;
@@ -774,7 +774,7 @@ int bmi160_probe_trigger(struct iio_dev *indio_dev, int irq, u32 irq_type)
 	ret = devm_request_irq(&indio_dev->dev, irq,
 			       &iio_trigger_generic_data_rdy_poll,
 			       irq_type, "bmi160", data->trig);
-	if (ret < 0)
+	if (ret)
 		return ret;
 
 	data->trig->dev.parent = regmap_get_device(data->regmap);
@@ -816,11 +816,11 @@ int bmi160_core_probe(struct device *dev, struct regmap *regmap,
 	data->regmap = regmap;
 
 	ret = bmi160_chip_init(data, use_spi);
-	if (ret < 0)
+	if (ret)
 		return ret;
 
 	ret = devm_add_action_or_reset(dev, bmi160_chip_uninit, data);
-	if (ret < 0)
+	if (ret)
 		return ret;
 
 	if (!name && ACPI_HANDLE(dev))
@@ -836,7 +836,7 @@ int bmi160_core_probe(struct device *dev, struct regmap *regmap,
 	ret = devm_iio_triggered_buffer_setup(dev, indio_dev,
 					      iio_pollfunc_store_time,
 					      bmi160_trigger_handler, NULL);
-	if (ret < 0)
+	if (ret)
 		return ret;
 
 	irq = bmi160_get_irq(dev->of_node, &int_pin);
@@ -849,11 +849,7 @@ int bmi160_core_probe(struct device *dev, struct regmap *regmap,
 		dev_info(&indio_dev->dev, "Not setting up IRQ trigger\n");
 	}
 
-	ret = devm_iio_device_register(dev, indio_dev);
-	if (ret < 0)
-		return ret;
-
-	return 0;
+	return devm_iio_device_register(dev, indio_dev);
 }
 EXPORT_SYMBOL_GPL(bmi160_core_probe);
 
-- 
cgit v1.2.3-58-ga151


From 1a78daea107ddb06233e80a44c26c6dd8310b607 Mon Sep 17 00:00:00 2001
From: Artur Rojek <contact@artur-rojek.eu>
Date: Mon, 4 Feb 2019 01:15:14 +0100
Subject: IIO: add Ingenic JZ47xx ADC driver.

Add an IIO driver for the ADC hardware present on Ingenic JZ47xx SoCs.

Signed-off-by: Artur Rojek <contact@artur-rojek.eu>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
---
 drivers/iio/adc/Kconfig       |   9 ++
 drivers/iio/adc/Makefile      |   1 +
 drivers/iio/adc/ingenic-adc.c | 364 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 374 insertions(+)
 create mode 100644 drivers/iio/adc/ingenic-adc.c

(limited to 'drivers/iio')

diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index 46ed6fa7e3f3..d61d939880b6 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -407,6 +407,15 @@ config INA2XX_ADC
 	  Say yes here to build support for TI INA2xx family of Power Monitors.
 	  This driver is mutually exclusive with the HWMON version.
 
+config INGENIC_ADC
+	tristate "Ingenic JZ47xx SoCs ADC driver"
+	depends on MIPS || COMPILE_TEST
+	help
+	  Say yes here to build support for the Ingenic JZ47xx SoCs ADC unit.
+
+	  This driver can also be built as a module. If so, the module will be
+	  called ingenic_adc.
+
 config IMX7D_ADC
 	tristate "Freescale IMX7D ADC driver"
 	depends on ARCH_MXC || COMPILE_TEST
diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
index 79d6511f0af3..d50eb47da484 100644
--- a/drivers/iio/adc/Makefile
+++ b/drivers/iio/adc/Makefile
@@ -40,6 +40,7 @@ obj-$(CONFIG_HI8435) += hi8435.o
 obj-$(CONFIG_HX711) += hx711.o
 obj-$(CONFIG_IMX7D_ADC) += imx7d_adc.o
 obj-$(CONFIG_INA2XX_ADC) += ina2xx-adc.o
+obj-$(CONFIG_INGENIC_ADC) += ingenic-adc.o
 obj-$(CONFIG_LP8788_ADC) += lp8788_adc.o
 obj-$(CONFIG_LPC18XX_ADC) += lpc18xx_adc.o
 obj-$(CONFIG_LPC32XX_ADC) += lpc32xx_adc.o
diff --git a/drivers/iio/adc/ingenic-adc.c b/drivers/iio/adc/ingenic-adc.c
new file mode 100644
index 000000000000..6ee1673deb0d
--- /dev/null
+++ b/drivers/iio/adc/ingenic-adc.c
@@ -0,0 +1,364 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * ADC driver for the Ingenic JZ47xx SoCs
+ * Copyright (c) 2019 Artur Rojek <contact@artur-rojek.eu>
+ *
+ * based on drivers/mfd/jz4740-adc.c
+ */
+
+#include <dt-bindings/iio/adc/ingenic,adc.h>
+#include <linux/clk.h>
+#include <linux/iio/iio.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/platform_device.h>
+
+#define JZ_ADC_REG_ENABLE		0x00
+#define JZ_ADC_REG_CFG			0x04
+#define JZ_ADC_REG_CTRL			0x08
+#define JZ_ADC_REG_STATUS		0x0c
+#define JZ_ADC_REG_ADTCH		0x18
+#define JZ_ADC_REG_ADBDAT		0x1c
+#define JZ_ADC_REG_ADSDAT		0x20
+
+#define JZ_ADC_REG_CFG_BAT_MD		BIT(4)
+
+#define JZ_ADC_AUX_VREF				3300
+#define JZ_ADC_AUX_VREF_BITS			12
+#define JZ_ADC_BATTERY_LOW_VREF			2500
+#define JZ_ADC_BATTERY_LOW_VREF_BITS		12
+#define JZ4725B_ADC_BATTERY_HIGH_VREF		7500
+#define JZ4725B_ADC_BATTERY_HIGH_VREF_BITS	10
+#define JZ4740_ADC_BATTERY_HIGH_VREF		(7500 * 0.986)
+#define JZ4740_ADC_BATTERY_HIGH_VREF_BITS	12
+
+struct ingenic_adc_soc_data {
+	unsigned int battery_high_vref;
+	unsigned int battery_high_vref_bits;
+	const int *battery_raw_avail;
+	size_t battery_raw_avail_size;
+	const int *battery_scale_avail;
+	size_t battery_scale_avail_size;
+};
+
+struct ingenic_adc {
+	void __iomem *base;
+	struct clk *clk;
+	struct mutex lock;
+	const struct ingenic_adc_soc_data *soc_data;
+	bool low_vref_mode;
+};
+
+static void ingenic_adc_set_config(struct ingenic_adc *adc,
+				   uint32_t mask,
+				   uint32_t val)
+{
+	uint32_t cfg;
+
+	clk_enable(adc->clk);
+	mutex_lock(&adc->lock);
+
+	cfg = readl(adc->base + JZ_ADC_REG_CFG) & ~mask;
+	cfg |= val;
+	writel(cfg, adc->base + JZ_ADC_REG_CFG);
+
+	mutex_unlock(&adc->lock);
+	clk_disable(adc->clk);
+}
+
+static void ingenic_adc_enable(struct ingenic_adc *adc,
+			       int engine,
+			       bool enabled)
+{
+	u8 val;
+
+	mutex_lock(&adc->lock);
+	val = readb(adc->base + JZ_ADC_REG_ENABLE);
+
+	if (enabled)
+		val |= BIT(engine);
+	else
+		val &= ~BIT(engine);
+
+	writeb(val, adc->base + JZ_ADC_REG_ENABLE);
+	mutex_unlock(&adc->lock);
+}
+
+static int ingenic_adc_capture(struct ingenic_adc *adc,
+			       int engine)
+{
+	u8 val;
+	int ret;
+
+	ingenic_adc_enable(adc, engine, true);
+	ret = readb_poll_timeout(adc->base + JZ_ADC_REG_ENABLE, val,
+				 !(val & BIT(engine)), 250, 1000);
+	if (ret)
+		ingenic_adc_enable(adc, engine, false);
+
+	return ret;
+}
+
+static int ingenic_adc_write_raw(struct iio_dev *iio_dev,
+				 struct iio_chan_spec const *chan,
+				 int val,
+				 int val2,
+				 long m)
+{
+	struct ingenic_adc *adc = iio_priv(iio_dev);
+
+	switch (m) {
+	case IIO_CHAN_INFO_SCALE:
+		switch (chan->channel) {
+		case INGENIC_ADC_BATTERY:
+			if (val > JZ_ADC_BATTERY_LOW_VREF) {
+				ingenic_adc_set_config(adc,
+						       JZ_ADC_REG_CFG_BAT_MD,
+						       0);
+				adc->low_vref_mode = false;
+			} else {
+				ingenic_adc_set_config(adc,
+						       JZ_ADC_REG_CFG_BAT_MD,
+						       JZ_ADC_REG_CFG_BAT_MD);
+				adc->low_vref_mode = true;
+			}
+			return 0;
+		default:
+			return -EINVAL;
+		}
+	default:
+		return -EINVAL;
+	}
+}
+
+static const int jz4725b_adc_battery_raw_avail[] = {
+	0, 1, (1 << JZ_ADC_BATTERY_LOW_VREF_BITS) - 1,
+};
+
+static const int jz4725b_adc_battery_scale_avail[] = {
+	JZ4725B_ADC_BATTERY_HIGH_VREF, JZ4725B_ADC_BATTERY_HIGH_VREF_BITS,
+	JZ_ADC_BATTERY_LOW_VREF, JZ_ADC_BATTERY_LOW_VREF_BITS,
+};
+
+static const int jz4740_adc_battery_raw_avail[] = {
+	0, 1, (1 << JZ_ADC_BATTERY_LOW_VREF_BITS) - 1,
+};
+
+static const int jz4740_adc_battery_scale_avail[] = {
+	JZ4740_ADC_BATTERY_HIGH_VREF, JZ4740_ADC_BATTERY_HIGH_VREF_BITS,
+	JZ_ADC_BATTERY_LOW_VREF, JZ_ADC_BATTERY_LOW_VREF_BITS,
+};
+
+static const struct ingenic_adc_soc_data jz4725b_adc_soc_data = {
+	.battery_high_vref = JZ4725B_ADC_BATTERY_HIGH_VREF,
+	.battery_high_vref_bits = JZ4725B_ADC_BATTERY_HIGH_VREF_BITS,
+	.battery_raw_avail = jz4725b_adc_battery_raw_avail,
+	.battery_raw_avail_size = ARRAY_SIZE(jz4725b_adc_battery_raw_avail),
+	.battery_scale_avail = jz4725b_adc_battery_scale_avail,
+	.battery_scale_avail_size = ARRAY_SIZE(jz4725b_adc_battery_scale_avail),
+};
+
+static const struct ingenic_adc_soc_data jz4740_adc_soc_data = {
+	.battery_high_vref = JZ4740_ADC_BATTERY_HIGH_VREF,
+	.battery_high_vref_bits = JZ4740_ADC_BATTERY_HIGH_VREF_BITS,
+	.battery_raw_avail = jz4740_adc_battery_raw_avail,
+	.battery_raw_avail_size = ARRAY_SIZE(jz4740_adc_battery_raw_avail),
+	.battery_scale_avail = jz4740_adc_battery_scale_avail,
+	.battery_scale_avail_size = ARRAY_SIZE(jz4740_adc_battery_scale_avail),
+};
+
+static int ingenic_adc_read_avail(struct iio_dev *iio_dev,
+				  struct iio_chan_spec const *chan,
+				  const int **vals,
+				  int *type,
+				  int *length,
+				  long m)
+{
+	struct ingenic_adc *adc = iio_priv(iio_dev);
+
+	switch (m) {
+	case IIO_CHAN_INFO_RAW:
+		*type = IIO_VAL_INT;
+		*length = adc->soc_data->battery_raw_avail_size;
+		*vals = adc->soc_data->battery_raw_avail;
+		return IIO_AVAIL_RANGE;
+	case IIO_CHAN_INFO_SCALE:
+		*type = IIO_VAL_FRACTIONAL_LOG2;
+		*length = adc->soc_data->battery_scale_avail_size;
+		*vals = adc->soc_data->battery_scale_avail;
+		return IIO_AVAIL_LIST;
+	default:
+		return -EINVAL;
+	};
+}
+
+static int ingenic_adc_read_raw(struct iio_dev *iio_dev,
+				struct iio_chan_spec const *chan,
+				int *val,
+				int *val2,
+				long m)
+{
+	struct ingenic_adc *adc = iio_priv(iio_dev);
+	int ret;
+
+	switch (m) {
+	case IIO_CHAN_INFO_RAW:
+		clk_enable(adc->clk);
+		ret = ingenic_adc_capture(adc, chan->channel);
+		if (ret) {
+			clk_disable(adc->clk);
+			return ret;
+		}
+
+		switch (chan->channel) {
+		case INGENIC_ADC_AUX:
+			*val = readw(adc->base + JZ_ADC_REG_ADSDAT);
+			break;
+		case INGENIC_ADC_BATTERY:
+			*val = readw(adc->base + JZ_ADC_REG_ADBDAT);
+			break;
+		}
+
+		clk_disable(adc->clk);
+
+		return IIO_VAL_INT;
+	case IIO_CHAN_INFO_SCALE:
+		switch (chan->channel) {
+		case INGENIC_ADC_AUX:
+			*val = JZ_ADC_AUX_VREF;
+			*val2 = JZ_ADC_AUX_VREF_BITS;
+			break;
+		case INGENIC_ADC_BATTERY:
+			if (adc->low_vref_mode) {
+				*val = JZ_ADC_BATTERY_LOW_VREF;
+				*val2 = JZ_ADC_BATTERY_LOW_VREF_BITS;
+			} else {
+				*val = adc->soc_data->battery_high_vref;
+				*val2 = adc->soc_data->battery_high_vref_bits;
+			}
+			break;
+		}
+
+		return IIO_VAL_FRACTIONAL_LOG2;
+	default:
+		return -EINVAL;
+	}
+}
+
+static void ingenic_adc_clk_cleanup(void *data)
+{
+	clk_unprepare(data);
+}
+
+static const struct iio_info ingenic_adc_info = {
+	.write_raw = ingenic_adc_write_raw,
+	.read_raw = ingenic_adc_read_raw,
+	.read_avail = ingenic_adc_read_avail,
+};
+
+static const struct iio_chan_spec ingenic_channels[] = {
+	{
+		.extend_name = "aux",
+		.type = IIO_VOLTAGE,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+				      BIT(IIO_CHAN_INFO_SCALE),
+		.indexed = 1,
+		.channel = INGENIC_ADC_AUX,
+	},
+	{
+		.extend_name = "battery",
+		.type = IIO_VOLTAGE,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+				      BIT(IIO_CHAN_INFO_SCALE),
+		.info_mask_separate_available = BIT(IIO_CHAN_INFO_RAW) |
+						BIT(IIO_CHAN_INFO_SCALE),
+		.indexed = 1,
+		.channel = INGENIC_ADC_BATTERY,
+	},
+};
+
+static int ingenic_adc_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct iio_dev *iio_dev;
+	struct ingenic_adc *adc;
+	struct resource *mem_base;
+	const struct ingenic_adc_soc_data *soc_data;
+	int ret;
+
+	soc_data = device_get_match_data(dev);
+	if (!soc_data)
+		return -EINVAL;
+
+	iio_dev = devm_iio_device_alloc(dev, sizeof(*adc));
+	if (!iio_dev)
+		return -ENOMEM;
+
+	adc = iio_priv(iio_dev);
+	mutex_init(&adc->lock);
+	adc->soc_data = soc_data;
+
+	mem_base = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	adc->base = devm_ioremap_resource(dev, mem_base);
+	if (IS_ERR(adc->base)) {
+		dev_err(dev, "Unable to ioremap mmio resource\n");
+		return PTR_ERR(adc->base);
+	}
+
+	adc->clk = devm_clk_get(dev, "adc");
+	if (IS_ERR(adc->clk)) {
+		dev_err(dev, "Unable to get clock\n");
+		return PTR_ERR(adc->clk);
+	}
+
+	ret = clk_prepare_enable(adc->clk);
+	if (ret) {
+		dev_err(dev, "Failed to enable clock\n");
+		return ret;
+	}
+
+	/* Put hardware in a known passive state. */
+	writeb(0x00, adc->base + JZ_ADC_REG_ENABLE);
+	writeb(0xff, adc->base + JZ_ADC_REG_CTRL);
+	clk_disable(adc->clk);
+
+	ret = devm_add_action_or_reset(dev, ingenic_adc_clk_cleanup, adc->clk);
+	if (ret) {
+		dev_err(dev, "Unable to add action\n");
+		return ret;
+	}
+
+	iio_dev->dev.parent = dev;
+	iio_dev->name = "jz-adc";
+	iio_dev->modes = INDIO_DIRECT_MODE;
+	iio_dev->channels = ingenic_channels;
+	iio_dev->num_channels = ARRAY_SIZE(ingenic_channels);
+	iio_dev->info = &ingenic_adc_info;
+
+	ret = devm_iio_device_register(dev, iio_dev);
+	if (ret)
+		dev_err(dev, "Unable to register IIO device\n");
+
+	return ret;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id ingenic_adc_of_match[] = {
+	{ .compatible = "ingenic,jz4725b-adc", .data = &jz4725b_adc_soc_data, },
+	{ .compatible = "ingenic,jz4740-adc", .data = &jz4740_adc_soc_data, },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, ingenic_adc_of_match);
+#endif
+
+static struct platform_driver ingenic_adc_driver = {
+	.driver = {
+		.name = "ingenic-adc",
+		.of_match_table = of_match_ptr(ingenic_adc_of_match),
+	},
+	.probe = ingenic_adc_probe,
+};
+module_platform_driver(ingenic_adc_driver);
+MODULE_LICENSE("GPL v2");
-- 
cgit v1.2.3-58-ga151


From cbd5dd387afab8511e055d0487e1ef747e7f72b5 Mon Sep 17 00:00:00 2001
From: Stefan Popa <stefan.popa@analog.com>
Date: Mon, 4 Feb 2019 11:19:35 +0200
Subject: drivers: iio: dac: Fix wrong license for ADI drivers

Analog Devices drivers are typically GPL v2 only. This patch fixes the
inconsistencies between the module license and SPDX.

Signed-off-by: Stefan Popa <stefan.popa@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
---
 drivers/iio/dac/ad5686-spi.c | 2 +-
 drivers/iio/dac/ad5686.c     | 2 +-
 drivers/iio/dac/ad5686.h     | 2 +-
 drivers/iio/dac/ad5696-i2c.c | 2 +-
 drivers/iio/dac/ad5758.c     | 2 +-
 5 files changed, 5 insertions(+), 5 deletions(-)

(limited to 'drivers/iio')

diff --git a/drivers/iio/dac/ad5686-spi.c b/drivers/iio/dac/ad5686-spi.c
index 4d857c8da2d2..0188ded5137c 100644
--- a/drivers/iio/dac/ad5686-spi.c
+++ b/drivers/iio/dac/ad5686-spi.c
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0+
+// SPDX-License-Identifier: GPL-2.0
 /*
  * AD5672R, AD5674R, AD5676, AD5676R, AD5679R,
  * AD5681R, AD5682R, AD5683, AD5683R, AD5684,
diff --git a/drivers/iio/dac/ad5686.c b/drivers/iio/dac/ad5686.c
index 6dd2759b9092..e06b29c565b9 100644
--- a/drivers/iio/dac/ad5686.c
+++ b/drivers/iio/dac/ad5686.c
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0+
+// SPDX-License-Identifier: GPL-2.0
 /*
  * AD5686R, AD5685R, AD5684R Digital to analog converters  driver
  *
diff --git a/drivers/iio/dac/ad5686.h b/drivers/iio/dac/ad5686.h
index 4c3e171ce0cc..70a779939ddb 100644
--- a/drivers/iio/dac/ad5686.h
+++ b/drivers/iio/dac/ad5686.h
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: GPL-2.0+ */
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * This file is part of AD5686 DAC driver
  *
diff --git a/drivers/iio/dac/ad5696-i2c.c b/drivers/iio/dac/ad5696-i2c.c
index 7350d9806a11..ccf794caef43 100644
--- a/drivers/iio/dac/ad5696-i2c.c
+++ b/drivers/iio/dac/ad5696-i2c.c
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0+
+// SPDX-License-Identifier: GPL-2.0
 /*
  * AD5671R, AD5675R, AD5691R, AD5692R, AD5693, AD5693R,
  * AD5694, AD5694R, AD5695R, AD5696, AD5696R
diff --git a/drivers/iio/dac/ad5758.c b/drivers/iio/dac/ad5758.c
index ef41f12bf262..2bdf1b0aee06 100644
--- a/drivers/iio/dac/ad5758.c
+++ b/drivers/iio/dac/ad5758.c
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0+
+// SPDX-License-Identifier: GPL-2.0
 /*
  * AD5758 Digital to analog converters driver
  *
-- 
cgit v1.2.3-58-ga151


From e9517dffd1d5adf575a4ad9a231a68d48dcc5e6b Mon Sep 17 00:00:00 2001
From: Stefan Popa <stefan.popa@analog.com>
Date: Mon, 4 Feb 2019 12:30:15 +0200
Subject: iio: adc: ad7768-1: Add support for setting the sampling frequency

The AD7768-1 core ADC receives a master clock signal (MCLK). The MCLK
frequency combined with the MCLK division and the digital filter
decimation rates, determines the sampling frequency. Along with
MCLK_DIV, the power mode is also configured according to datasheet
recommendations.

From user space, available sampling frequencies can be read. However,
it is not required for an exact value to be entered, since the driver
will look for the closest available match.

When the device configuration changes (for example, if the filter
decimation rate changes), a SYNC_IN pulse is required.

Signed-off-by: Stefan Popa <stefan.popa@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
---
 drivers/iio/adc/ad7768-1.c | 202 ++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 199 insertions(+), 3 deletions(-)

(limited to 'drivers/iio')

diff --git a/drivers/iio/adc/ad7768-1.c b/drivers/iio/adc/ad7768-1.c
index 78449e90b2f5..0d132708c429 100644
--- a/drivers/iio/adc/ad7768-1.c
+++ b/drivers/iio/adc/ad7768-1.c
@@ -9,6 +9,7 @@
 #include <linux/delay.h>
 #include <linux/device.h>
 #include <linux/err.h>
+#include <linux/gpio/consumer.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/regulator/consumer.h>
@@ -59,6 +60,18 @@
 #define AD7768_REG_DIG_DIAG_STATUS	0x30
 #define AD7768_REG_MCLK_COUNTER		0x31
 
+/* AD7768_REG_POWER_CLOCK */
+#define AD7768_PWR_MCLK_DIV_MSK		GENMASK(5, 4)
+#define AD7768_PWR_MCLK_DIV(x)		FIELD_PREP(AD7768_PWR_MCLK_DIV_MSK, x)
+#define AD7768_PWR_PWRMODE_MSK		GENMASK(1, 0)
+#define AD7768_PWR_PWRMODE(x)		FIELD_PREP(AD7768_PWR_PWRMODE_MSK, x)
+
+/* AD7768_REG_DIGITAL_FILTER */
+#define AD7768_DIG_FIL_FIL_MSK		GENMASK(6, 4)
+#define AD7768_DIG_FIL_FIL(x)		FIELD_PREP(AD7768_DIG_FIL_FIL_MSK, x)
+#define AD7768_DIG_FIL_DEC_MSK		GENMASK(2, 0)
+#define AD7768_DIG_FIL_DEC_RATE(x)	FIELD_PREP(AD7768_DIG_FIL_DEC_MSK, x)
+
 /* AD7768_REG_CONVERSION */
 #define AD7768_CONV_MODE_MSK		GENMASK(2, 0)
 #define AD7768_CONV_MODE(x)		FIELD_PREP(AD7768_CONV_MODE_MSK, x)
@@ -80,11 +93,51 @@ enum ad7768_pwrmode {
 	AD7768_FAST_MODE = 3
 };
 
+enum ad7768_mclk_div {
+	AD7768_MCLK_DIV_16,
+	AD7768_MCLK_DIV_8,
+	AD7768_MCLK_DIV_4,
+	AD7768_MCLK_DIV_2
+};
+
+enum ad7768_dec_rate {
+	AD7768_DEC_RATE_32 = 0,
+	AD7768_DEC_RATE_64 = 1,
+	AD7768_DEC_RATE_128 = 2,
+	AD7768_DEC_RATE_256 = 3,
+	AD7768_DEC_RATE_512 = 4,
+	AD7768_DEC_RATE_1024 = 5,
+	AD7768_DEC_RATE_8 = 9,
+	AD7768_DEC_RATE_16 = 10
+};
+
+struct ad7768_clk_configuration {
+	enum ad7768_mclk_div mclk_div;
+	enum ad7768_dec_rate dec_rate;
+	unsigned int clk_div;
+	enum ad7768_pwrmode pwrmode;
+};
+
+static const struct ad7768_clk_configuration ad7768_clk_config[] = {
+	{ AD7768_MCLK_DIV_2, AD7768_DEC_RATE_8, 16,  AD7768_FAST_MODE },
+	{ AD7768_MCLK_DIV_2, AD7768_DEC_RATE_16, 32,  AD7768_FAST_MODE },
+	{ AD7768_MCLK_DIV_2, AD7768_DEC_RATE_32, 64, AD7768_FAST_MODE },
+	{ AD7768_MCLK_DIV_2, AD7768_DEC_RATE_64, 128, AD7768_FAST_MODE },
+	{ AD7768_MCLK_DIV_2, AD7768_DEC_RATE_128, 256, AD7768_FAST_MODE },
+	{ AD7768_MCLK_DIV_4, AD7768_DEC_RATE_128, 512, AD7768_MED_MODE },
+	{ AD7768_MCLK_DIV_4, AD7768_DEC_RATE_256, 1024, AD7768_MED_MODE },
+	{ AD7768_MCLK_DIV_4, AD7768_DEC_RATE_512, 2048, AD7768_MED_MODE },
+	{ AD7768_MCLK_DIV_4, AD7768_DEC_RATE_1024, 4096, AD7768_MED_MODE },
+	{ AD7768_MCLK_DIV_8, AD7768_DEC_RATE_1024, 8192, AD7768_MED_MODE },
+	{ AD7768_MCLK_DIV_16, AD7768_DEC_RATE_1024, 16384, AD7768_ECO_MODE },
+};
+
 static const struct iio_chan_spec ad7768_channels[] = {
 	{
 		.type = IIO_VOLTAGE,
 		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
 		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
+		.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
 		.indexed = 1,
 		.channel = 0,
 		.scan_index = 0,
@@ -102,8 +155,12 @@ struct ad7768_state {
 	struct spi_device *spi;
 	struct regulator *vref;
 	struct mutex lock;
+	struct clk *mclk;
+	unsigned int mclk_freq;
+	unsigned int samp_freq;
 	struct completion completion;
 	struct iio_trigger *trig;
+	struct gpio_desc *gpio_sync_in;
 	/*
 	 * DMA (thus cache coherency maintenance) requires the
 	 * transfer buffers to live in their own cache lines.
@@ -210,6 +267,90 @@ err_unlock:
 	return ret;
 }
 
+static int ad7768_set_dig_fil(struct ad7768_state *st,
+			      enum ad7768_dec_rate dec_rate)
+{
+	unsigned int mode;
+	int ret;
+
+	if (dec_rate == AD7768_DEC_RATE_8 || dec_rate == AD7768_DEC_RATE_16)
+		mode = AD7768_DIG_FIL_FIL(dec_rate);
+	else
+		mode = AD7768_DIG_FIL_DEC_RATE(dec_rate);
+
+	ret = ad7768_spi_reg_write(st, AD7768_REG_DIGITAL_FILTER, mode);
+	if (ret < 0)
+		return ret;
+
+	/* A sync-in pulse is required every time the filter dec rate changes */
+	gpiod_set_value(st->gpio_sync_in, 1);
+	gpiod_set_value(st->gpio_sync_in, 0);
+
+	return 0;
+}
+
+static int ad7768_set_freq(struct ad7768_state *st,
+			   unsigned int freq)
+{
+	unsigned int diff_new, diff_old, pwr_mode, i, idx;
+	int res, ret;
+
+	diff_old = U32_MAX;
+	idx = 0;
+
+	res = DIV_ROUND_CLOSEST(st->mclk_freq, freq);
+
+	/* Find the closest match for the desired sampling frequency */
+	for (i = 0; i < ARRAY_SIZE(ad7768_clk_config); i++) {
+		diff_new = abs(res - ad7768_clk_config[i].clk_div);
+		if (diff_new < diff_old) {
+			diff_old = diff_new;
+			idx = i;
+		}
+	}
+
+	/*
+	 * Set both the mclk_div and pwrmode with a single write to the
+	 * POWER_CLOCK register
+	 */
+	pwr_mode = AD7768_PWR_MCLK_DIV(ad7768_clk_config[idx].mclk_div) |
+		   AD7768_PWR_PWRMODE(ad7768_clk_config[idx].pwrmode);
+	ret = ad7768_spi_reg_write(st, AD7768_REG_POWER_CLOCK, pwr_mode);
+	if (ret < 0)
+		return ret;
+
+	ret =  ad7768_set_dig_fil(st, ad7768_clk_config[idx].dec_rate);
+	if (ret < 0)
+		return ret;
+
+	st->samp_freq = DIV_ROUND_CLOSEST(st->mclk_freq,
+					  ad7768_clk_config[idx].clk_div);
+
+	return 0;
+}
+
+static ssize_t ad7768_sampling_freq_avail(struct device *dev,
+					  struct device_attribute *attr,
+					  char *buf)
+{
+	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+	struct ad7768_state *st = iio_priv(indio_dev);
+	unsigned int freq;
+	int i, len = 0;
+
+	for (i = 0; i < ARRAY_SIZE(ad7768_clk_config); i++) {
+		freq = DIV_ROUND_CLOSEST(st->mclk_freq,
+					 ad7768_clk_config[i].clk_div);
+		len += scnprintf(buf + len, PAGE_SIZE - len, "%d ", freq);
+	}
+
+	buf[len - 1] = '\n';
+
+	return len;
+}
+
+static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(ad7768_sampling_freq_avail);
+
 static int ad7768_read_raw(struct iio_dev *indio_dev,
 			   struct iio_chan_spec const *chan,
 			   int *val, int *val2, long info)
@@ -242,13 +383,43 @@ static int ad7768_read_raw(struct iio_dev *indio_dev,
 		*val2 = chan->scan_type.realbits;
 
 		return IIO_VAL_FRACTIONAL_LOG2;
+
+	case IIO_CHAN_INFO_SAMP_FREQ:
+		*val = st->samp_freq;
+
+		return IIO_VAL_INT;
 	}
 
 	return -EINVAL;
 }
 
+static int ad7768_write_raw(struct iio_dev *indio_dev,
+			    struct iio_chan_spec const *chan,
+			    int val, int val2, long info)
+{
+	struct ad7768_state *st = iio_priv(indio_dev);
+
+	switch (info) {
+	case IIO_CHAN_INFO_SAMP_FREQ:
+		return ad7768_set_freq(st, val);
+	default:
+		return -EINVAL;
+	}
+}
+
+static struct attribute *ad7768_attributes[] = {
+	&iio_dev_attr_sampling_frequency_available.dev_attr.attr,
+	NULL
+};
+
+static const struct attribute_group ad7768_group = {
+	.attrs = ad7768_attributes,
+};
+
 static const struct iio_info ad7768_info = {
+	.attrs = &ad7768_group,
 	.read_raw = &ad7768_read_raw,
+	.write_raw = &ad7768_write_raw,
 	.debugfs_reg_access = &ad7768_reg_access,
 };
 
@@ -270,9 +441,13 @@ static int ad7768_setup(struct ad7768_state *st)
 	if (ret)
 		return ret;
 
-	/* Set power mode to fast */
-	return ad7768_spi_reg_write(st, AD7768_REG_POWER_CLOCK,
-				    AD7768_FAST_MODE);
+	st->gpio_sync_in = devm_gpiod_get(&st->spi->dev, "adi,sync-in",
+					  GPIOD_OUT_LOW);
+	if (IS_ERR(st->gpio_sync_in))
+		return PTR_ERR(st->gpio_sync_in);
+
+	/* Set the default sampling frequency to 32000 kSPS */
+	return ad7768_set_freq(st, 32000);
 }
 
 static irqreturn_t ad7768_trigger_handler(int irq, void *p)
@@ -356,6 +531,13 @@ static void ad7768_regulator_disable(void *data)
 	regulator_disable(st->vref);
 }
 
+static void ad7768_clk_disable(void *data)
+{
+	struct ad7768_state *st = data;
+
+	clk_disable_unprepare(st->mclk);
+}
+
 static int ad7768_probe(struct spi_device *spi)
 {
 	struct ad7768_state *st;
@@ -383,6 +565,20 @@ static int ad7768_probe(struct spi_device *spi)
 	if (ret)
 		return ret;
 
+	st->mclk = devm_clk_get(&spi->dev, "mclk");
+	if (IS_ERR(st->mclk))
+		return PTR_ERR(st->mclk);
+
+	ret = clk_prepare_enable(st->mclk);
+	if (ret < 0)
+		return ret;
+
+	ret = devm_add_action_or_reset(&spi->dev, ad7768_clk_disable, st);
+	if (ret)
+		return ret;
+
+	st->mclk_freq = clk_get_rate(st->mclk);
+
 	spi_set_drvdata(spi, indio_dev);
 	mutex_init(&st->lock);
 
-- 
cgit v1.2.3-58-ga151


From 77c5a7f5c123a25f693506b9a347ad3acf3c6bbf Mon Sep 17 00:00:00 2001
From: Ricardo Ribalda Delgado <ricardo@ribalda.com>
Date: Mon, 4 Feb 2019 13:44:41 +0100
Subject: iio: adc: ad7476: Add support for TI ADS786X ADCs

Add support for Texas Instruments ADS7866, ADS7867 and ADS7868
8/10/12 bit Single channel ADC.

Datasheet: http://www.ti.com/lit/ds/symlink/ads7868.pdf

Signed-off-by: Ricardo Ribalda Delgado <ricardo@ribalda.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
---
 drivers/iio/adc/Kconfig  | 11 +++++++----
 drivers/iio/adc/ad7476.c | 20 ++++++++++++++++++++
 2 files changed, 27 insertions(+), 4 deletions(-)

(limited to 'drivers/iio')

diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index d61d939880b6..5debc67df70a 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -57,14 +57,17 @@ config AD7298
 	  module will be called ad7298.
 
 config AD7476
-	tristate "Analog Devices AD7476 and similar 1-channel ADCs driver"
+	tristate "Analog Devices AD7476 1-channel ADCs driver and other similar devices from AD an TI"
 	depends on SPI
 	select IIO_BUFFER
 	select IIO_TRIGGERED_BUFFER
 	help
-	  Say yes here to build support for Analog Devices AD7273, AD7274, AD7276,
-	  AD7277, AD7278, AD7475, AD7476, AD7477, AD7478, AD7466, AD7467, AD7468,
-	  AD7495, AD7910, AD7920, AD7920 SPI analog to digital converters (ADC).
+	  Say yes here to build support for the following SPI analog to
+	  digital converters (ADCs):
+	  Analog Devices: AD7273, AD7274, AD7276, AD7277, AD7278, AD7475,
+	  AD7476, AD7477, AD7478, AD7466, AD7467, AD7468, AD7495, AD7910,
+	  AD7920.
+	  Texas Instruments: ADS7866, ADS7867, ADS7868.
 
 	  To compile this driver as a module, choose M here: the
 	  module will be called ad7476.
diff --git a/drivers/iio/adc/ad7476.c b/drivers/iio/adc/ad7476.c
index 0549686b9ef8..76747488044b 100644
--- a/drivers/iio/adc/ad7476.c
+++ b/drivers/iio/adc/ad7476.c
@@ -59,6 +59,9 @@ enum ad7476_supported_device_ids {
 	ID_ADC081S,
 	ID_ADC101S,
 	ID_ADC121S,
+	ID_ADS7866,
+	ID_ADS7867,
+	ID_ADS7868,
 };
 
 static irqreturn_t ad7476_trigger_handler(int irq, void  *p)
@@ -157,6 +160,8 @@ static int ad7476_read_raw(struct iio_dev *indio_dev,
 #define AD7940_CHAN(bits) _AD7476_CHAN((bits), 15 - (bits), \
 		BIT(IIO_CHAN_INFO_RAW))
 #define AD7091R_CHAN(bits) _AD7476_CHAN((bits), 16 - (bits), 0)
+#define ADS786X_CHAN(bits) _AD7476_CHAN((bits), 12 - (bits), \
+		BIT(IIO_CHAN_INFO_RAW))
 
 static const struct ad7476_chip_info ad7476_chip_info_tbl[] = {
 	[ID_AD7091R] = {
@@ -209,6 +214,18 @@ static const struct ad7476_chip_info ad7476_chip_info_tbl[] = {
 		.channel[0] = ADC081S_CHAN(12),
 		.channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1),
 	},
+	[ID_ADS7866] = {
+		.channel[0] = ADS786X_CHAN(12),
+		.channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1),
+	},
+	[ID_ADS7867] = {
+		.channel[0] = ADS786X_CHAN(10),
+		.channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1),
+	},
+	[ID_ADS7868] = {
+		.channel[0] = ADS786X_CHAN(8),
+		.channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1),
+	},
 };
 
 static const struct iio_info ad7476_info = {
@@ -314,6 +331,9 @@ static const struct spi_device_id ad7476_id[] = {
 	{"adc081s", ID_ADC081S},
 	{"adc101s", ID_ADC101S},
 	{"adc121s", ID_ADC121S},
+	{"ads7866", ID_ADS7866},
+	{"ads7867", ID_ADS7867},
+	{"ads7868", ID_ADS7868},
 	{}
 };
 MODULE_DEVICE_TABLE(spi, ad7476_id);
-- 
cgit v1.2.3-58-ga151


From 977724d20584bd268b0a84bc2fbfffbc8681b595 Mon Sep 17 00:00:00 2001
From: Ricardo Ribalda Delgado <ricardo@ribalda.com>
Date: Mon, 4 Feb 2019 13:48:32 +0100
Subject: iio:dac:ti-dac7612: Add driver for Texas Instruments DAC7612

It is a driver for Texas Instruments Dual, 12-Bit Serial Input
Digital-to-Analog Converter.

Datasheet of this chip:
http://www.ti.com/lit/ds/sbas106/sbas106.pdf

Signed-off-by: Ricardo Ribalda Delgado <ricardo@ribalda.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
---
 MAINTAINERS                  |   6 ++
 drivers/iio/dac/Kconfig      |  10 +++
 drivers/iio/dac/Makefile     |   1 +
 drivers/iio/dac/ti-dac7612.c | 184 +++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 201 insertions(+)
 create mode 100644 drivers/iio/dac/ti-dac7612.c

(limited to 'drivers/iio')

diff --git a/MAINTAINERS b/MAINTAINERS
index f35c77b029ff..005a79379975 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -15082,6 +15082,12 @@ L:	alsa-devel@alsa-project.org (moderated for non-subscribers)
 S:	Maintained
 F:	sound/soc/ti/
 
+Texas Instruments' DAC7612 DAC Driver
+M:	Ricardo Ribalda <ricardo@ribalda.com>
+L:	linux-iio@vger.kernel.org
+S:	Supported
+F:	drivers/iio/dac/ti-dac7612.c
+
 THANKO'S RAREMONO AM/FM/SW RADIO RECEIVER USB DRIVER
 M:	Hans Verkuil <hverkuil@xs4all.nl>
 L:	linux-media@vger.kernel.org
diff --git a/drivers/iio/dac/Kconfig b/drivers/iio/dac/Kconfig
index f28daf67db6a..fbef9107acad 100644
--- a/drivers/iio/dac/Kconfig
+++ b/drivers/iio/dac/Kconfig
@@ -375,6 +375,16 @@ config TI_DAC7311
 
 	  If compiled as a module, it will be called ti-dac7311.
 
+config TI_DAC7612
+	tristate "Texas Instruments 12-bit 2-channel DAC driver"
+	depends on SPI_MASTER && GPIOLIB
+	help
+	  Driver for the Texas Instruments DAC7612, DAC7612U, DAC7612UB
+	  The driver hand drive the load pin automatically, otherwise
+	  it needs to be toggled manually.
+
+	  If compiled as a module, it will be called ti-dac7612.
+
 config VF610_DAC
 	tristate "Vybrid vf610 DAC driver"
 	depends on OF
diff --git a/drivers/iio/dac/Makefile b/drivers/iio/dac/Makefile
index f0a37c93de8e..1369fa1d2f0e 100644
--- a/drivers/iio/dac/Makefile
+++ b/drivers/iio/dac/Makefile
@@ -41,4 +41,5 @@ obj-$(CONFIG_STM32_DAC) += stm32-dac.o
 obj-$(CONFIG_TI_DAC082S085) += ti-dac082s085.o
 obj-$(CONFIG_TI_DAC5571) += ti-dac5571.o
 obj-$(CONFIG_TI_DAC7311) += ti-dac7311.o
+obj-$(CONFIG_TI_DAC7612) += ti-dac7612.o
 obj-$(CONFIG_VF610_DAC) += vf610_dac.o
diff --git a/drivers/iio/dac/ti-dac7612.c b/drivers/iio/dac/ti-dac7612.c
new file mode 100644
index 000000000000..c46805144dd4
--- /dev/null
+++ b/drivers/iio/dac/ti-dac7612.c
@@ -0,0 +1,184 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * DAC7612 Dual, 12-Bit Serial input Digital-to-Analog Converter
+ *
+ * Copyright 2019 Qtechnology A/S
+ * 2019 Ricardo Ribalda <ricardo@ribalda.com>
+ *
+ * Licensed under the GPL-2.
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/spi/spi.h>
+#include <linux/gpio/consumer.h>
+#include <linux/iio/iio.h>
+
+#define DAC7612_RESOLUTION 12
+#define DAC7612_ADDRESS 4
+#define DAC7612_START 5
+
+struct dac7612 {
+	struct spi_device *spi;
+	struct gpio_desc *loaddacs;
+	uint16_t cache[2];
+
+	/*
+	 * DMA (thus cache coherency maintenance) requires the
+	 * transfer buffers to live in their own cache lines.
+	 */
+	uint8_t data[2] ____cacheline_aligned;
+};
+
+static int dac7612_cmd_single(struct dac7612 *priv, int channel, u16 val)
+{
+	int ret;
+
+	priv->data[0] = BIT(DAC7612_START) | (channel << DAC7612_ADDRESS);
+	priv->data[0] |= val >> 8;
+	priv->data[1] = val & 0xff;
+
+	priv->cache[channel] = val;
+
+	ret = spi_write(priv->spi, priv->data, sizeof(priv->data));
+	if (ret)
+		return ret;
+
+	gpiod_set_value(priv->loaddacs, 1);
+	gpiod_set_value(priv->loaddacs, 0);
+
+	return 0;
+}
+
+#define dac7612_CHANNEL(chan, name) {				\
+	.type = IIO_VOLTAGE,					\
+	.channel = (chan),					\
+	.indexed = 1,						\
+	.output = 1,						\
+	.datasheet_name = name,					\
+	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),		\
+	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),	\
+}
+
+static const struct iio_chan_spec dac7612_channels[] = {
+	dac7612_CHANNEL(0, "OUTA"),
+	dac7612_CHANNEL(1, "OUTB"),
+};
+
+static int dac7612_read_raw(struct iio_dev *iio_dev,
+			    const struct iio_chan_spec *chan,
+			    int *val, int *val2, long mask)
+{
+	struct dac7612 *priv;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:
+		priv = iio_priv(iio_dev);
+		*val = priv->cache[chan->channel];
+		return IIO_VAL_INT;
+
+	case IIO_CHAN_INFO_SCALE:
+		*val = 1;
+		return IIO_VAL_INT;
+
+	default:
+		return -EINVAL;
+	}
+}
+
+static int dac7612_write_raw(struct iio_dev *iio_dev,
+			     const struct iio_chan_spec *chan,
+			     int val, int val2, long mask)
+{
+	struct dac7612 *priv = iio_priv(iio_dev);
+	int ret;
+
+	if (mask != IIO_CHAN_INFO_RAW)
+		return -EINVAL;
+
+	if ((val >= BIT(DAC7612_RESOLUTION)) || val < 0 || val2)
+		return -EINVAL;
+
+	if (val == priv->cache[chan->channel])
+		return 0;
+
+	mutex_lock(&iio_dev->mlock);
+	ret = dac7612_cmd_single(priv, chan->channel, val);
+	mutex_unlock(&iio_dev->mlock);
+
+	return ret;
+}
+
+static const struct iio_info dac7612_info = {
+	.read_raw = dac7612_read_raw,
+	.write_raw = dac7612_write_raw,
+};
+
+static int dac7612_probe(struct spi_device *spi)
+{
+	struct iio_dev *iio_dev;
+	struct dac7612 *priv;
+	int i;
+	int ret;
+
+	iio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*priv));
+	if (!iio_dev)
+		return -ENOMEM;
+
+	priv = iio_priv(iio_dev);
+	/*
+	 * LOADDACS pin can be controlled by the driver or externally.
+	 * When controlled by the driver, the DAC value is updated after
+	 * every write.
+	 * When the driver does not control the PIN, the user or an external
+	 * event can change the value of all DACs by pulsing down the LOADDACs
+	 * pin.
+	 */
+	priv->loaddacs = devm_gpiod_get_optional(&spi->dev, "ti,loaddacs",
+						 GPIOD_OUT_LOW);
+	if (IS_ERR(priv->loaddacs))
+		return PTR_ERR(priv->loaddacs);
+	priv->spi = spi;
+	spi_set_drvdata(spi, iio_dev);
+	iio_dev->dev.parent = &spi->dev;
+	iio_dev->info = &dac7612_info;
+	iio_dev->modes = INDIO_DIRECT_MODE;
+	iio_dev->channels = dac7612_channels;
+	iio_dev->num_channels = ARRAY_SIZE(priv->cache);
+	iio_dev->name = spi_get_device_id(spi)->name;
+
+	for (i = 0; i < ARRAY_SIZE(priv->cache); i++) {
+		ret = dac7612_cmd_single(priv, i, 0);
+		if (ret)
+			return ret;
+	}
+
+	return devm_iio_device_register(&spi->dev, iio_dev);
+}
+
+static const struct spi_device_id dac7612_id[] = {
+	{"ti-dac7612"},
+	{}
+};
+MODULE_DEVICE_TABLE(spi, dac7612_id);
+
+static const struct of_device_id dac7612_of_match[] = {
+	{ .compatible = "ti,dac7612" },
+	{ .compatible = "ti,dac7612u" },
+	{ .compatible = "ti,dac7612ub" },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, dac7612_of_match);
+
+static struct spi_driver dac7612_driver = {
+	.driver = {
+		   .name = "ti-dac7612",
+		   .of_match_table = dac7612_of_match,
+		   },
+	.probe = dac7612_probe,
+	.id_table = dac7612_id,
+};
+module_spi_driver(dac7612_driver);
+
+MODULE_AUTHOR("Ricardo Ribalda <ricardo@ribalda.com>");
+MODULE_DESCRIPTION("Texas Instruments DAC7612 DAC driver");
+MODULE_LICENSE("GPL v2");
-- 
cgit v1.2.3-58-ga151


From d4cd36220e861adb7dc5d507bae5524c6671e7d5 Mon Sep 17 00:00:00 2001
From: Luciana da Costa Marques <lucianadacostamarques@gmail.com>
Date: Sat, 9 Feb 2019 10:25:42 -0200
Subject: iio:accel:adxl345: Change alignment to match paranthesis

Align broken line to match upper line parenthesis. Solves the
checkpatch.pl's message:

CHECK: Alignment should match open parenthesis

Signed-off-by: Luciana da Costa Marques <lucianadacostamarques@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
---
 drivers/iio/accel/adxl345_core.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'drivers/iio')

diff --git a/drivers/iio/accel/adxl345_core.c b/drivers/iio/accel/adxl345_core.c
index 780f87f72338..f03ed00685ea 100644
--- a/drivers/iio/accel/adxl345_core.c
+++ b/drivers/iio/accel/adxl345_core.c
@@ -150,8 +150,8 @@ static int adxl345_read_raw(struct iio_dev *indio_dev,
 }
 
 static int adxl345_write_raw(struct iio_dev *indio_dev,
-			    struct iio_chan_spec const *chan,
-			    int val, int val2, long mask)
+			     struct iio_chan_spec const *chan,
+			     int val, int val2, long mask)
 {
 	struct adxl345_data *data = iio_priv(indio_dev);
 	s64 n;
-- 
cgit v1.2.3-58-ga151


From 905889b4a34c753a538015f0b2cdaa0c9e3a4fd5 Mon Sep 17 00:00:00 2001
From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Sat, 9 Feb 2019 12:03:52 +0300
Subject: iio: chemical: sps30: fix a loop timeout test

The "while (tries--) {" loop is a postop so it exits with "tries" set
to -1.

Fixes: 232e0f6ddeae ("iio: chemical: add support for Sensirion SPS30 sensor")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
---
 drivers/iio/chemical/sps30.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'drivers/iio')

diff --git a/drivers/iio/chemical/sps30.c b/drivers/iio/chemical/sps30.c
index e03a28a67146..375df5060ed5 100644
--- a/drivers/iio/chemical/sps30.c
+++ b/drivers/iio/chemical/sps30.c
@@ -210,7 +210,7 @@ static int sps30_do_meas(struct sps30_state *state, s32 *data, int size)
 		msleep_interruptible(300);
 	}
 
-	if (!tries)
+	if (tries == -1)
 		return -ETIMEDOUT;
 
 	ret = sps30_do_cmd(state, SPS30_READ_DATA, tmp, sizeof(int) * size);
-- 
cgit v1.2.3-58-ga151


From 2ea8bab4dd2a9014e723b28091831fa850b82d83 Mon Sep 17 00:00:00 2001
From: Krzysztof Kozlowski <krzk@kernel.org>
Date: Sat, 9 Feb 2019 00:39:27 +0100
Subject: iio: adc: exynos-adc: Fix NULL pointer exception on unbind

Fix NULL pointer exception on device unbind when device tree does not
contain "has-touchscreen" property.  In such case the input device is
not registered so it should not be unregistered.

    $ echo "12d10000.adc" > /sys/bus/platform/drivers/exynos-adc/unbind

    Unable to handle kernel NULL pointer dereference at virtual address 00000474
    ...
    (input_unregister_device) from [<c0772060>] (exynos_adc_remove+0x20/0x80)
    (exynos_adc_remove) from [<c0587d5c>] (platform_drv_remove+0x20/0x40)
    (platform_drv_remove) from [<c05860f0>] (device_release_driver_internal+0xdc/0x1ac)
    (device_release_driver_internal) from [<c0583ecc>] (unbind_store+0x60/0xd4)
    (unbind_store) from [<c031b89c>] (kernfs_fop_write+0x100/0x1e0)
    (kernfs_fop_write) from [<c029709c>] (__vfs_write+0x2c/0x17c)
    (__vfs_write) from [<c0297374>] (vfs_write+0xa4/0x184)
    (vfs_write) from [<c0297594>] (ksys_write+0x4c/0xac)
    (ksys_write) from [<c0101000>] (ret_fast_syscall+0x0/0x28)

Fixes: 2bb8ad9b44c5 ("iio: exynos-adc: add experimental touchscreen support")
Cc: <stable@vger.kernel.org>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
---
 drivers/iio/adc/exynos_adc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'drivers/iio')

diff --git a/drivers/iio/adc/exynos_adc.c b/drivers/iio/adc/exynos_adc.c
index fa2d2b5767f3..41da522fc673 100644
--- a/drivers/iio/adc/exynos_adc.c
+++ b/drivers/iio/adc/exynos_adc.c
@@ -929,7 +929,7 @@ static int exynos_adc_remove(struct platform_device *pdev)
 	struct iio_dev *indio_dev = platform_get_drvdata(pdev);
 	struct exynos_adc *info = iio_priv(indio_dev);
 
-	if (IS_REACHABLE(CONFIG_INPUT)) {
+	if (IS_REACHABLE(CONFIG_INPUT) && info->input) {
 		free_irq(info->tsirq, info);
 		input_unregister_device(info->input);
 	}
-- 
cgit v1.2.3-58-ga151


From fc4e0c97d10da4ef9578a7013ad6b9708bacbf51 Mon Sep 17 00:00:00 2001
From: Colin Ian King <colin.king@canonical.com>
Date: Thu, 7 Feb 2019 09:39:02 +0000
Subject: iio: adc: ads124s08: fix spelling mistake "converions" ->
 "conversions"

There is a spelling mistake in several dev_err messages. Fix these.

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Acked-by: Dan Murphy <dmurphy@ti.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
---
 drivers/iio/adc/ti-ads124s08.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

(limited to 'drivers/iio')

diff --git a/drivers/iio/adc/ti-ads124s08.c b/drivers/iio/adc/ti-ads124s08.c
index c2cf58908fc8..53f17e4f2f23 100644
--- a/drivers/iio/adc/ti-ads124s08.c
+++ b/drivers/iio/adc/ti-ads124s08.c
@@ -232,7 +232,7 @@ static int ads124s_read_raw(struct iio_dev *indio_dev,
 
 		ret = ads124s_write_cmd(indio_dev, ADS124S08_START_CONV);
 		if (ret) {
-			dev_err(&priv->spi->dev, "Start converions failed\n");
+			dev_err(&priv->spi->dev, "Start conversions failed\n");
 			goto out;
 		}
 
@@ -246,7 +246,7 @@ static int ads124s_read_raw(struct iio_dev *indio_dev,
 
 		ret = ads124s_write_cmd(indio_dev, ADS124S08_STOP_CONV);
 		if (ret) {
-			dev_err(&priv->spi->dev, "Stop converions failed\n");
+			dev_err(&priv->spi->dev, "Stop conversions failed\n");
 			goto out;
 		}
 
@@ -283,12 +283,12 @@ static irqreturn_t ads124s_trigger_handler(int irq, void *p)
 
 		ret = ads124s_write_cmd(indio_dev, ADS124S08_START_CONV);
 		if (ret)
-			dev_err(&priv->spi->dev, "Start ADC converions failed\n");
+			dev_err(&priv->spi->dev, "Start ADC conversions failed\n");
 
 		buffer[j] = ads124s_read(indio_dev, scan_index);
 		ret = ads124s_write_cmd(indio_dev, ADS124S08_STOP_CONV);
 		if (ret)
-			dev_err(&priv->spi->dev, "Stop ADC converions failed\n");
+			dev_err(&priv->spi->dev, "Stop ADC conversions failed\n");
 
 		j++;
 	}
-- 
cgit v1.2.3-58-ga151


From 430583493627eea5bbd95c913bc1bc23b2f5a046 Mon Sep 17 00:00:00 2001
From: Gregory CLEMENT <gregory.clement@bootlin.com>
Date: Fri, 8 Feb 2019 17:09:42 +0100
Subject: iio:adc:lpc32xx use SPDX-License-Identifier

Convert the driver to SPDX license description which allow removing
several lines in the file.

Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
---
 drivers/iio/adc/lpc32xx_adc.c | 15 +--------------
 1 file changed, 1 insertion(+), 14 deletions(-)

(limited to 'drivers/iio')

diff --git a/drivers/iio/adc/lpc32xx_adc.c b/drivers/iio/adc/lpc32xx_adc.c
index 20b36690fa4f..e361c1532a75 100644
--- a/drivers/iio/adc/lpc32xx_adc.c
+++ b/drivers/iio/adc/lpc32xx_adc.c
@@ -1,23 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  *  lpc32xx_adc.c - Support for ADC in LPC32XX
  *
  *  3-channel, 10-bit ADC
  *
  *  Copyright (C) 2011, 2012 Roland Stigge <stigge@antcom.de>
- *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License
- *  along with this program; if not, write to the Free Software
- *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
 #include <linux/module.h>
-- 
cgit v1.2.3-58-ga151


From 59b9bb0abca9efe47207301dbaf0d1beee2bd0f7 Mon Sep 17 00:00:00 2001
From: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Date: Sat, 9 Feb 2019 19:32:58 +0000
Subject: iio:chemical:sps30 Supress some switch fallthrough warnings.

Fixes warnings reported on linux-next but marking one path
and adding an explicit return in the other.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Andreas Brauchli <a.brauchli@elementarea.net>
Acked-by: Tomasz Duszynski <tduszyns@gmail.com>
---
 drivers/iio/chemical/sps30.c | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'drivers/iio')

diff --git a/drivers/iio/chemical/sps30.c b/drivers/iio/chemical/sps30.c
index 375df5060ed5..edbb956e81e8 100644
--- a/drivers/iio/chemical/sps30.c
+++ b/drivers/iio/chemical/sps30.c
@@ -118,6 +118,7 @@ static int sps30_do_cmd(struct sps30_state *state, u16 cmd, u8 *data, int size)
 	case SPS30_READ_AUTO_CLEANING_PERIOD:
 		buf[0] = SPS30_AUTO_CLEANING_PERIOD >> 8;
 		buf[1] = (u8)SPS30_AUTO_CLEANING_PERIOD;
+		/* fall through */
 	case SPS30_READ_DATA_READY_FLAG:
 	case SPS30_READ_DATA:
 	case SPS30_READ_SERIAL:
@@ -295,6 +296,8 @@ static int sps30_read_raw(struct iio_dev *indio_dev,
 				*val2 = 10000;
 
 				return IIO_VAL_INT_PLUS_MICRO;
+			default:
+				return -EINVAL;
 			}
 		default:
 			return -EINVAL;
-- 
cgit v1.2.3-58-ga151


From a1d642266c147b9e34bd683bed1b7a935cdbfb8c Mon Sep 17 00:00:00 2001
From: Tomasz Duszynski <tduszyns@gmail.com>
Date: Sat, 9 Feb 2019 18:36:07 +0100
Subject: iio: chemical: add support for Plantower PMS7003 sensor

Add support for Plantower PMS7003 particulate matter sensor.

Signed-off-by: Tomasz Duszynski <tduszyns@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
---
 drivers/iio/chemical/Kconfig   |  10 ++
 drivers/iio/chemical/Makefile  |   1 +
 drivers/iio/chemical/pms7003.c | 340 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 351 insertions(+)
 create mode 100644 drivers/iio/chemical/pms7003.c

(limited to 'drivers/iio')

diff --git a/drivers/iio/chemical/Kconfig b/drivers/iio/chemical/Kconfig
index 57832b4360e9..d5d146e9e372 100644
--- a/drivers/iio/chemical/Kconfig
+++ b/drivers/iio/chemical/Kconfig
@@ -61,6 +61,16 @@ config IAQCORE
 	  iAQ-Core Continuous/Pulsed VOC (Volatile Organic Compounds)
 	  sensors
 
+config PMS7003
+	tristate "Plantower PMS7003 particulate matter sensor"
+	depends on SERIAL_DEV_BUS
+	help
+	  Say Y here to build support for the Plantower PMS7003 particulate
+	  matter sensor.
+
+	  To compile this driver as a module, choose M here: the module will
+	  be called pms7003.
+
 config SPS30
 	tristate "SPS30 particulate matter sensor"
 	depends on I2C
diff --git a/drivers/iio/chemical/Makefile b/drivers/iio/chemical/Makefile
index 65bf0f89c0e4..f5d1365acb49 100644
--- a/drivers/iio/chemical/Makefile
+++ b/drivers/iio/chemical/Makefile
@@ -9,6 +9,7 @@ obj-$(CONFIG_BME680_I2C) += bme680_i2c.o
 obj-$(CONFIG_BME680_SPI) += bme680_spi.o
 obj-$(CONFIG_CCS811)		+= ccs811.o
 obj-$(CONFIG_IAQCORE)		+= ams-iaq-core.o
+obj-$(CONFIG_PMS7003) += pms7003.o
 obj-$(CONFIG_SENSIRION_SGP30)	+= sgp30.o
 obj-$(CONFIG_SPS30) += sps30.o
 obj-$(CONFIG_VZ89X)		+= vz89x.o
diff --git a/drivers/iio/chemical/pms7003.c b/drivers/iio/chemical/pms7003.c
new file mode 100644
index 000000000000..db8e7b2327b3
--- /dev/null
+++ b/drivers/iio/chemical/pms7003.c
@@ -0,0 +1,340 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Plantower PMS7003 particulate matter sensor driver
+ *
+ * Copyright (c) Tomasz Duszynski <tduszyns@gmail.com>
+ */
+
+#include <asm/unaligned.h>
+#include <linux/completion.h>
+#include <linux/device.h>
+#include <linux/errno.h>
+#include <linux/iio/buffer.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/trigger_consumer.h>
+#include <linux/iio/triggered_buffer.h>
+#include <linux/jiffies.h>
+#include <linux/kernel.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/serdev.h>
+
+#define PMS7003_DRIVER_NAME "pms7003"
+
+#define PMS7003_MAGIC 0x424d
+/* last 2 data bytes hold frame checksum */
+#define PMS7003_MAX_DATA_LENGTH 28
+#define PMS7003_CHECKSUM_LENGTH 2
+#define PMS7003_PM10_OFFSET 10
+#define PMS7003_PM2P5_OFFSET 8
+#define PMS7003_PM1_OFFSET 6
+
+#define PMS7003_TIMEOUT msecs_to_jiffies(6000)
+#define PMS7003_CMD_LENGTH 7
+#define PMS7003_PM_MAX 1000
+#define PMS7003_PM_MIN 0
+
+enum {
+	PM1,
+	PM2P5,
+	PM10,
+};
+
+enum pms7003_cmd {
+	CMD_WAKEUP,
+	CMD_ENTER_PASSIVE_MODE,
+	CMD_READ_PASSIVE,
+	CMD_SLEEP,
+};
+
+/*
+ * commands have following format:
+ *
+ * +------+------+-----+------+-----+-----------+-----------+
+ * | 0x42 | 0x4d | cmd | 0x00 | arg | cksum msb | cksum lsb |
+ * +------+------+-----+------+-----+-----------+-----------+
+ */
+static const u8 pms7003_cmd_tbl[][PMS7003_CMD_LENGTH] = {
+	[CMD_WAKEUP] = { 0x42, 0x4d, 0xe4, 0x00, 0x01, 0x01, 0x74 },
+	[CMD_ENTER_PASSIVE_MODE] = { 0x42, 0x4d, 0xe1, 0x00, 0x00, 0x01, 0x70 },
+	[CMD_READ_PASSIVE] = { 0x42, 0x4d, 0xe2, 0x00, 0x00, 0x01, 0x71 },
+	[CMD_SLEEP] = { 0x42, 0x4d, 0xe4, 0x00, 0x00, 0x01, 0x73 },
+};
+
+struct pms7003_frame {
+	u8 data[PMS7003_MAX_DATA_LENGTH];
+	u16 expected_length;
+	u16 length;
+};
+
+struct pms7003_state {
+	struct serdev_device *serdev;
+	struct pms7003_frame frame;
+	struct completion frame_ready;
+	struct mutex lock; /* must be held whenever state gets touched */
+};
+
+static int pms7003_do_cmd(struct pms7003_state *state, enum pms7003_cmd cmd)
+{
+	int ret;
+
+	ret = serdev_device_write(state->serdev, pms7003_cmd_tbl[cmd],
+				  PMS7003_CMD_LENGTH, PMS7003_TIMEOUT);
+	if (ret < PMS7003_CMD_LENGTH)
+		return ret < 0 ? ret : -EIO;
+
+	ret = wait_for_completion_interruptible_timeout(&state->frame_ready,
+							PMS7003_TIMEOUT);
+	if (!ret)
+		ret = -ETIMEDOUT;
+
+	return ret < 0 ? ret : 0;
+}
+
+static u16 pms7003_get_pm(const u8 *data)
+{
+	return clamp_val(get_unaligned_be16(data),
+			 PMS7003_PM_MIN, PMS7003_PM_MAX);
+}
+
+static irqreturn_t pms7003_trigger_handler(int irq, void *p)
+{
+	struct iio_poll_func *pf = p;
+	struct iio_dev *indio_dev = pf->indio_dev;
+	struct pms7003_state *state = iio_priv(indio_dev);
+	struct pms7003_frame *frame = &state->frame;
+	u16 data[3 + 1 + 4]; /* PM1, PM2P5, PM10, padding, timestamp */
+	int ret;
+
+	mutex_lock(&state->lock);
+	ret = pms7003_do_cmd(state, CMD_READ_PASSIVE);
+	if (ret) {
+		mutex_unlock(&state->lock);
+		goto err;
+	}
+
+	data[PM1] = pms7003_get_pm(frame->data + PMS7003_PM1_OFFSET);
+	data[PM2P5] = pms7003_get_pm(frame->data + PMS7003_PM2P5_OFFSET);
+	data[PM10] = pms7003_get_pm(frame->data + PMS7003_PM10_OFFSET);
+	mutex_unlock(&state->lock);
+
+	iio_push_to_buffers_with_timestamp(indio_dev, data,
+					   iio_get_time_ns(indio_dev));
+err:
+	iio_trigger_notify_done(indio_dev->trig);
+
+	return IRQ_HANDLED;
+}
+
+static int pms7003_read_raw(struct iio_dev *indio_dev,
+			    struct iio_chan_spec const *chan,
+			    int *val, int *val2, long mask)
+{
+	struct pms7003_state *state = iio_priv(indio_dev);
+	struct pms7003_frame *frame = &state->frame;
+	int ret;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_PROCESSED:
+		switch (chan->type) {
+		case IIO_MASSCONCENTRATION:
+			mutex_lock(&state->lock);
+			ret = pms7003_do_cmd(state, CMD_READ_PASSIVE);
+			if (ret) {
+				mutex_unlock(&state->lock);
+				return ret;
+			}
+
+			*val = pms7003_get_pm(frame->data + chan->address);
+			mutex_unlock(&state->lock);
+
+			return IIO_VAL_INT;
+		default:
+			return -EINVAL;
+		}
+	}
+
+	return -EINVAL;
+}
+
+static const struct iio_info pms7003_info = {
+	.read_raw = pms7003_read_raw,
+};
+
+#define PMS7003_CHAN(_index, _mod, _addr) { \
+	.type = IIO_MASSCONCENTRATION, \
+	.modified = 1, \
+	.channel2 = IIO_MOD_ ## _mod, \
+	.address = _addr, \
+	.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), \
+	.scan_index = _index, \
+	.scan_type = { \
+		.sign = 'u', \
+		.realbits = 10, \
+		.storagebits = 16, \
+		.endianness = IIO_CPU, \
+	}, \
+}
+
+static const struct iio_chan_spec pms7003_channels[] = {
+	PMS7003_CHAN(0, PM1, PMS7003_PM1_OFFSET),
+	PMS7003_CHAN(1, PM2P5, PMS7003_PM2P5_OFFSET),
+	PMS7003_CHAN(2, PM10, PMS7003_PM10_OFFSET),
+	IIO_CHAN_SOFT_TIMESTAMP(3),
+};
+
+static u16 pms7003_calc_checksum(struct pms7003_frame *frame)
+{
+	u16 checksum = (PMS7003_MAGIC >> 8) + (u8)(PMS7003_MAGIC & 0xff) +
+		       (frame->length >> 8) + (u8)frame->length;
+	int i;
+
+	for (i = 0; i < frame->length - PMS7003_CHECKSUM_LENGTH; i++)
+		checksum += frame->data[i];
+
+	return checksum;
+}
+
+static bool pms7003_frame_is_okay(struct pms7003_frame *frame)
+{
+	int offset = frame->length - PMS7003_CHECKSUM_LENGTH;
+	u16 checksum = get_unaligned_be16(frame->data + offset);
+
+	return checksum == pms7003_calc_checksum(frame);
+}
+
+static int pms7003_receive_buf(struct serdev_device *serdev,
+			       const unsigned char *buf, size_t size)
+{
+	struct iio_dev *indio_dev = serdev_device_get_drvdata(serdev);
+	struct pms7003_state *state = iio_priv(indio_dev);
+	struct pms7003_frame *frame = &state->frame;
+	int num;
+
+	if (!frame->expected_length) {
+		u16 magic;
+
+		/* wait for SOF and data length */
+		if (size < 4)
+			return 0;
+
+		magic = get_unaligned_be16(buf);
+		if (magic != PMS7003_MAGIC)
+			return 2;
+
+		num = get_unaligned_be16(buf + 2);
+		if (num <= PMS7003_MAX_DATA_LENGTH) {
+			frame->expected_length = num;
+			frame->length = 0;
+		}
+
+		return 4;
+	}
+
+	num = min(size, (size_t)(frame->expected_length - frame->length));
+	memcpy(frame->data + frame->length, buf, num);
+	frame->length += num;
+
+	if (frame->length == frame->expected_length) {
+		if (pms7003_frame_is_okay(frame))
+			complete(&state->frame_ready);
+
+		frame->expected_length = 0;
+	}
+
+	return num;
+}
+
+static const struct serdev_device_ops pms7003_serdev_ops = {
+	.receive_buf = pms7003_receive_buf,
+	.write_wakeup = serdev_device_write_wakeup,
+};
+
+static void pms7003_stop(void *data)
+{
+	struct pms7003_state *state = data;
+
+	pms7003_do_cmd(state, CMD_SLEEP);
+}
+
+static const unsigned long pms7003_scan_masks[] = { 0x07, 0x00 };
+
+static int pms7003_probe(struct serdev_device *serdev)
+{
+	struct pms7003_state *state;
+	struct iio_dev *indio_dev;
+	int ret;
+
+	indio_dev = devm_iio_device_alloc(&serdev->dev, sizeof(*state));
+	if (!indio_dev)
+		return -ENOMEM;
+
+	state = iio_priv(indio_dev);
+	serdev_device_set_drvdata(serdev, indio_dev);
+	state->serdev = serdev;
+	indio_dev->dev.parent = &serdev->dev;
+	indio_dev->info = &pms7003_info;
+	indio_dev->name = PMS7003_DRIVER_NAME;
+	indio_dev->channels = pms7003_channels,
+	indio_dev->num_channels = ARRAY_SIZE(pms7003_channels);
+	indio_dev->modes = INDIO_DIRECT_MODE;
+	indio_dev->available_scan_masks = pms7003_scan_masks;
+
+	mutex_init(&state->lock);
+	init_completion(&state->frame_ready);
+
+	serdev_device_set_client_ops(serdev, &pms7003_serdev_ops);
+	ret = devm_serdev_device_open(&serdev->dev, serdev);
+	if (ret)
+		return ret;
+
+	serdev_device_set_baudrate(serdev, 9600);
+	serdev_device_set_flow_control(serdev, false);
+
+	ret = serdev_device_set_parity(serdev, SERDEV_PARITY_NONE);
+	if (ret)
+		return ret;
+
+	ret = pms7003_do_cmd(state, CMD_WAKEUP);
+	if (ret) {
+		dev_err(&serdev->dev, "failed to wakeup sensor\n");
+		return ret;
+	}
+
+	ret = pms7003_do_cmd(state, CMD_ENTER_PASSIVE_MODE);
+	if (ret) {
+		dev_err(&serdev->dev, "failed to enter passive mode\n");
+		return ret;
+	}
+
+	ret = devm_add_action_or_reset(&serdev->dev, pms7003_stop, state);
+	if (ret)
+		return ret;
+
+	ret = devm_iio_triggered_buffer_setup(&serdev->dev, indio_dev, NULL,
+					      pms7003_trigger_handler, NULL);
+	if (ret)
+		return ret;
+
+	return devm_iio_device_register(&serdev->dev, indio_dev);
+}
+
+static const struct of_device_id pms7003_of_match[] = {
+	{ .compatible = "plantower,pms7003" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, pms7003_of_match);
+
+static struct serdev_device_driver pms7003_driver = {
+	.driver = {
+		.name = PMS7003_DRIVER_NAME,
+		.of_match_table = pms7003_of_match,
+	},
+	.probe = pms7003_probe,
+};
+module_serdev_device_driver(pms7003_driver);
+
+MODULE_AUTHOR("Tomasz Duszynski <tduszyns@gmail.com>");
+MODULE_DESCRIPTION("Plantower PMS7003 particulate matter sensor driver");
+MODULE_LICENSE("GPL v2");
-- 
cgit v1.2.3-58-ga151


From 103cda6a3b8d2c10d5f8cd7abad118e9db8f4776 Mon Sep 17 00:00:00 2001
From: Krzysztof Kozlowski <krzk@kernel.org>
Date: Tue, 12 Feb 2019 18:45:49 +0100
Subject: iio: adc: exynos-adc: Use proper number of channels for Exynos4x12

Exynos4212 and Exynos4412 have only four ADC channels so using
"samsung,exynos-adc-v1" compatible (for eight channels ADCv1) on them is
wrong.  Add a new compatible for Exynos4x12.

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
---
 .../devicetree/bindings/iio/adc/samsung,exynos-adc.txt  |  4 +++-
 drivers/iio/adc/exynos_adc.c                            | 17 +++++++++++++++++
 2 files changed, 20 insertions(+), 1 deletion(-)

(limited to 'drivers/iio')

diff --git a/Documentation/devicetree/bindings/iio/adc/samsung,exynos-adc.txt b/Documentation/devicetree/bindings/iio/adc/samsung,exynos-adc.txt
index a10c1f89037d..e1fe02f3e3e9 100644
--- a/Documentation/devicetree/bindings/iio/adc/samsung,exynos-adc.txt
+++ b/Documentation/devicetree/bindings/iio/adc/samsung,exynos-adc.txt
@@ -11,11 +11,13 @@ New driver handles the following
 
 Required properties:
 - compatible:		Must be "samsung,exynos-adc-v1"
-				for exynos4412/5250 controllers.
+				for Exynos5250 controllers.
 			Must be "samsung,exynos-adc-v2" for
 				future controllers.
 			Must be "samsung,exynos3250-adc" for
 				controllers compatible with ADC of Exynos3250.
+			Must be "samsung,exynos4212-adc" for
+				controllers compatible with ADC of Exynos4212 and Exynos4412.
 			Must be "samsung,exynos7-adc" for
 				the ADC in Exynos7 and compatibles
 			Must be "samsung,s3c2410-adc" for
diff --git a/drivers/iio/adc/exynos_adc.c b/drivers/iio/adc/exynos_adc.c
index 41da522fc673..1ca2c4d39f87 100644
--- a/drivers/iio/adc/exynos_adc.c
+++ b/drivers/iio/adc/exynos_adc.c
@@ -115,6 +115,7 @@
 #define MAX_ADC_V2_CHANNELS		10
 #define MAX_ADC_V1_CHANNELS		8
 #define MAX_EXYNOS3250_ADC_CHANNELS	2
+#define MAX_EXYNOS4212_ADC_CHANNELS	4
 #define MAX_S5PV210_ADC_CHANNELS	10
 
 /* Bit definitions common for ADC_V1 and ADC_V2 */
@@ -271,6 +272,19 @@ static void exynos_adc_v1_start_conv(struct exynos_adc *info,
 	writel(con1 | ADC_CON_EN_START, ADC_V1_CON(info->regs));
 }
 
+/* Exynos4212 and 4412 is like ADCv1 but with four channels only */
+static const struct exynos_adc_data exynos4212_adc_data = {
+	.num_channels	= MAX_EXYNOS4212_ADC_CHANNELS,
+	.mask		= ADC_DATX_MASK,	/* 12 bit ADC resolution */
+	.needs_adc_phy	= true,
+	.phy_offset	= EXYNOS_ADCV1_PHY_OFFSET,
+
+	.init_hw	= exynos_adc_v1_init_hw,
+	.exit_hw	= exynos_adc_v1_exit_hw,
+	.clear_irq	= exynos_adc_v1_clear_irq,
+	.start_conv	= exynos_adc_v1_start_conv,
+};
+
 static const struct exynos_adc_data exynos_adc_v1_data = {
 	.num_channels	= MAX_ADC_V1_CHANNELS,
 	.mask		= ADC_DATX_MASK,	/* 12 bit ADC resolution */
@@ -492,6 +506,9 @@ static const struct of_device_id exynos_adc_match[] = {
 	}, {
 		.compatible = "samsung,s5pv210-adc",
 		.data = &exynos_adc_s5pv210_data,
+	}, {
+		.compatible = "samsung,exynos4212-adc",
+		.data = &exynos4212_adc_data,
 	}, {
 		.compatible = "samsung,exynos-adc-v1",
 		.data = &exynos_adc_v1_data,
-- 
cgit v1.2.3-58-ga151