From a6d160b21fe6f9e3ac868ab1d79194d3e7977cd5 Mon Sep 17 00:00:00 2001 From: Matti Vaittinen Date: Fri, 20 Oct 2023 13:53:47 +0300 Subject: iio: bu27008: Add illuminance channel The RGB + IR data can be used to calculate the illuminance value (luxes). Implement the equation obtained from the ROHM HW colleagues and add a raw light data channel outputting illuminance values in (nano) Luxes. Both the read_raw and buffering values are supported, with the limitation that buffering is only allowed when a suitable scan-mask is used. (RGB+IR, no clear). The equation has been developed by ROHM HW colleagues for open air sensor. Adding any lens to the sensor is likely to impact to used c1, c2, c3 coefficients. Also, the output values have only been tested on BU27008. According to the HW colleagues, the very same equation should work on BU27010 as well. Calculate and output illuminance values from BU27008 and BU27010. Signed-off-by: Matti Vaittinen Link: https://lore.kernel.org/r/ZTJcOxSb/WHzdN8h@dc78bmyyyyyyyyyyyyydt-3.rev.dnainternet.fi Signed-off-by: Jonathan Cameron --- drivers/iio/light/rohm-bu27008.c | 201 ++++++++++++++++++++++++++++++++++++++- 1 file changed, 196 insertions(+), 5 deletions(-) (limited to 'drivers/iio/light') diff --git a/drivers/iio/light/rohm-bu27008.c b/drivers/iio/light/rohm-bu27008.c index 6a6d77805091..0f010eff1981 100644 --- a/drivers/iio/light/rohm-bu27008.c +++ b/drivers/iio/light/rohm-bu27008.c @@ -130,6 +130,7 @@ * @BU27008_BLUE: Blue channel. Via data2 (when used). * @BU27008_CLEAR: Clear channel. Via data2 or data3 (when used). * @BU27008_IR: IR channel. Via data3 (when used). + * @BU27008_LUX: Illuminance channel, computed using RGB and IR. * @BU27008_NUM_CHANS: Number of channel types. */ enum bu27008_chan_type { @@ -138,6 +139,7 @@ enum bu27008_chan_type { BU27008_BLUE, BU27008_CLEAR, BU27008_IR, + BU27008_LUX, BU27008_NUM_CHANS }; @@ -172,6 +174,8 @@ static const unsigned long bu27008_scan_masks[] = { ALWAYS_SCANNABLE | BIT(BU27008_CLEAR) | BIT(BU27008_IR), /* buffer is R, G, B, IR */ ALWAYS_SCANNABLE | BIT(BU27008_BLUE) | BIT(BU27008_IR), + /* buffer is R, G, B, IR, LUX */ + ALWAYS_SCANNABLE | BIT(BU27008_BLUE) | BIT(BU27008_IR) | BIT(BU27008_LUX), 0 }; @@ -331,6 +335,19 @@ static const struct iio_chan_spec bu27008_channels[] = { * Hence we don't advertise available ones either. */ BU27008_CHAN(IR, DATA3, 0), + { + .type = IIO_LIGHT, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | + BIT(IIO_CHAN_INFO_SCALE), + .channel = BU27008_LUX, + .scan_index = BU27008_LUX, + .scan_type = { + .sign = 'u', + .realbits = 64, + .storagebits = 64, + .endianness = IIO_CPU, + }, + }, IIO_CHAN_SOFT_TIMESTAMP(BU27008_NUM_CHANS), }; @@ -1004,6 +1021,169 @@ static int bu27008_read_one(struct bu27008_data *data, struct iio_dev *idev, return ret; } +#define BU27008_LUX_DATA_RED 0 +#define BU27008_LUX_DATA_GREEN 1 +#define BU27008_LUX_DATA_BLUE 2 +#define BU27008_LUX_DATA_IR 3 +#define LUX_DATA_SIZE (BU27008_NUM_HW_CHANS * sizeof(__le16)) + +static int bu27008_read_lux_chans(struct bu27008_data *data, unsigned int time, + __le16 *chan_data) +{ + int ret, chan_sel, tmpret, valid; + + chan_sel = BU27008_BLUE2_IR3 << (ffs(data->cd->chan_sel_mask) - 1); + + ret = regmap_update_bits(data->regmap, data->cd->chan_sel_reg, + data->cd->chan_sel_mask, chan_sel); + if (ret) + return ret; + + ret = bu27008_meas_set(data, true); + if (ret) + return ret; + + msleep(time / USEC_PER_MSEC); + + ret = regmap_read_poll_timeout(data->regmap, data->cd->valid_reg, + valid, (valid & BU27008_MASK_VALID), + BU27008_VALID_RESULT_WAIT_QUANTA_US, + BU27008_MAX_VALID_RESULT_WAIT_US); + if (ret) + goto out; + + ret = regmap_bulk_read(data->regmap, BU27008_REG_DATA0_LO, chan_data, + LUX_DATA_SIZE); + if (ret) + goto out; +out: + tmpret = bu27008_meas_set(data, false); + if (tmpret) + dev_warn(data->dev, "Stopping measurement failed\n"); + + return ret; +} + +/* + * Following equation for computing lux out of register values was given by + * ROHM HW colleagues; + * + * Red = RedData*1024 / Gain * 20 / meas_mode + * Green = GreenData* 1024 / Gain * 20 / meas_mode + * Blue = BlueData* 1024 / Gain * 20 / meas_mode + * IR = IrData* 1024 / Gain * 20 / meas_mode + * + * where meas_mode is the integration time in mS / 10 + * + * IRratio = (IR > 0.18 * Green) ? 0 : 1 + * + * Lx = max(c1*Red + c2*Green + c3*Blue,0) + * + * for + * IRratio 0: c1 = -0.00002237, c2 = 0.0003219, c3 = -0.000120371 + * IRratio 1: c1 = -0.00001074, c2 = 0.000305415, c3 = -0.000129367 + */ + +/* + * The max chan data is 0xffff. When we multiply it by 1024 * 20, we'll get + * 0x4FFFB000 which still fits in 32-bit integer. This won't overflow. + */ +#define NORM_CHAN_DATA_FOR_LX_CALC(chan, gain, time) (le16_to_cpu(chan) * \ + 1024 * 20 / (gain) / (time)) +static u64 bu27008_calc_nlux(struct bu27008_data *data, __le16 *lux_data, + unsigned int gain, unsigned int gain_ir, unsigned int time) +{ + unsigned int red, green, blue, ir; + s64 c1, c2, c3, nlux; + + time /= 10000; + ir = NORM_CHAN_DATA_FOR_LX_CALC(lux_data[BU27008_LUX_DATA_IR], gain_ir, time); + red = NORM_CHAN_DATA_FOR_LX_CALC(lux_data[BU27008_LUX_DATA_RED], gain, time); + green = NORM_CHAN_DATA_FOR_LX_CALC(lux_data[BU27008_LUX_DATA_GREEN], gain, time); + blue = NORM_CHAN_DATA_FOR_LX_CALC(lux_data[BU27008_LUX_DATA_BLUE], gain, time); + + if ((u64)ir * 100LLU > (u64)green * 18LLU) { + c1 = -22370; + c2 = 321900; + c3 = -120371; + } else { + c1 = -10740; + c2 = 305415; + c3 = -129367; + } + nlux = c1 * red + c2 * green + c3 * blue; + + return max_t(s64, 0, nlux); +} + +static int bu27008_get_time_n_gains(struct bu27008_data *data, + unsigned int *gain, unsigned int *gain_ir, unsigned int *time) +{ + int ret; + + ret = bu27008_get_gain(data, &data->gts, gain); + if (ret < 0) + return ret; + + ret = bu27008_get_gain(data, &data->gts_ir, gain_ir); + if (ret < 0) + return ret; + + ret = bu27008_get_int_time_us(data); + if (ret < 0) + return ret; + + /* Max integration time is 400000. Fits in signed int. */ + *time = ret; + + return 0; +} + +struct bu27008_buf { + __le16 chan[BU27008_NUM_HW_CHANS]; + u64 lux __aligned(8); + s64 ts __aligned(8); +}; + +static int bu27008_buffer_fill_lux(struct bu27008_data *data, + struct bu27008_buf *raw) +{ + unsigned int gain, gain_ir, time; + int ret; + + ret = bu27008_get_time_n_gains(data, &gain, &gain_ir, &time); + if (ret) + return ret; + + raw->lux = bu27008_calc_nlux(data, raw->chan, gain, gain_ir, time); + + return 0; +} + +static int bu27008_read_lux(struct bu27008_data *data, struct iio_dev *idev, + struct iio_chan_spec const *chan, + int *val, int *val2) +{ + __le16 lux_data[BU27008_NUM_HW_CHANS]; + unsigned int gain, gain_ir, time; + u64 nlux; + int ret; + + ret = bu27008_get_time_n_gains(data, &gain, &gain_ir, &time); + if (ret) + return ret; + + ret = bu27008_read_lux_chans(data, time, lux_data); + if (ret) + return ret; + + nlux = bu27008_calc_nlux(data, lux_data, gain, gain_ir, time); + *val = (int)nlux; + *val2 = nlux >> 32LLU; + + return IIO_VAL_INT_64; +} + static int bu27008_read_raw(struct iio_dev *idev, struct iio_chan_spec const *chan, int *val, int *val2, long mask) @@ -1018,7 +1198,10 @@ static int bu27008_read_raw(struct iio_dev *idev, return -EBUSY; mutex_lock(&data->mutex); - ret = bu27008_read_one(data, idev, chan, val, val2); + if (chan->type == IIO_LIGHT) + ret = bu27008_read_lux(data, idev, chan, val, val2); + else + ret = bu27008_read_one(data, idev, chan, val, val2); mutex_unlock(&data->mutex); iio_device_release_direct_mode(idev); @@ -1026,6 +1209,11 @@ static int bu27008_read_raw(struct iio_dev *idev, return ret; case IIO_CHAN_INFO_SCALE: + if (chan->type == IIO_LIGHT) { + *val = 0; + *val2 = 1; + return IIO_VAL_INT_PLUS_NANO; + } ret = bu27008_get_scale(data, chan->scan_index == BU27008_IR, val, val2); if (ret) @@ -1236,10 +1424,7 @@ static irqreturn_t bu27008_trigger_handler(int irq, void *p) struct iio_poll_func *pf = p; struct iio_dev *idev = pf->indio_dev; struct bu27008_data *data = iio_priv(idev); - struct { - __le16 chan[BU27008_NUM_HW_CHANS]; - s64 ts __aligned(8); - } raw; + struct bu27008_buf raw; int ret, dummy; memset(&raw, 0, sizeof(raw)); @@ -1257,6 +1442,12 @@ static irqreturn_t bu27008_trigger_handler(int irq, void *p) if (ret < 0) goto err_read; + if (test_bit(BU27008_LUX, idev->active_scan_mask)) { + ret = bu27008_buffer_fill_lux(data, &raw); + if (ret) + goto err_read; + } + iio_push_to_buffers_with_timestamp(idev, &raw, pf->timestamp); err_read: iio_trigger_notify_done(idev->trig); -- cgit v1.2.3-58-ga151 From 00799564bafdd73db1bb0482eefbe1aba7d5e15f Mon Sep 17 00:00:00 2001 From: Shreeya Patel Date: Wed, 8 Nov 2023 00:50:05 +0530 Subject: iio: light: ltrf216a: Return floating point values For better precision of input light intesity, return floating point values through sysfs instead of an integer value Signed-off-by: Shreeya Patel Link: https://lore.kernel.org/r/20231107192005.285534-1-shreeya.patel@collabora.com Signed-off-by: Jonathan Cameron --- drivers/iio/light/ltrf216a.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) (limited to 'drivers/iio/light') diff --git a/drivers/iio/light/ltrf216a.c b/drivers/iio/light/ltrf216a.c index 8de4dd849936..68dc48420a88 100644 --- a/drivers/iio/light/ltrf216a.c +++ b/drivers/iio/light/ltrf216a.c @@ -234,7 +234,7 @@ static int ltrf216a_read_data(struct ltrf216a_data *data, u8 addr) static int ltrf216a_get_lux(struct ltrf216a_data *data) { int ret, greendata; - u64 lux, div; + u64 lux; ret = ltrf216a_set_power_state(data, true); if (ret) @@ -246,10 +246,9 @@ static int ltrf216a_get_lux(struct ltrf216a_data *data) ltrf216a_set_power_state(data, false); - lux = greendata * 45 * LTRF216A_WIN_FAC * 100; - div = data->als_gain_fac * data->int_time_fac * 100; + lux = greendata * 45 * LTRF216A_WIN_FAC; - return div_u64(lux, div); + return lux; } static int ltrf216a_read_raw(struct iio_dev *indio_dev, @@ -279,7 +278,8 @@ static int ltrf216a_read_raw(struct iio_dev *indio_dev, if (ret < 0) return ret; *val = ret; - return IIO_VAL_INT; + *val2 = data->als_gain_fac * data->int_time_fac; + return IIO_VAL_FRACTIONAL; case IIO_CHAN_INFO_INT_TIME: mutex_lock(&data->lock); ret = ltrf216a_get_int_time(data, val, val2); -- cgit v1.2.3-58-ga151 From 3b82f43238aecd73464aeacc9c73407079511533 Mon Sep 17 00:00:00 2001 From: Javier Carrasco Date: Mon, 27 Nov 2023 18:34:30 +0100 Subject: iio: light: add VEML6075 UVA and UVB light sensor driver The Vishay VEMl6075 is a low power, 16-bit resolution UVA and UVB light sensor with I2C interface and noise compensation (visible and infrarred). Every UV channel generates an output signal measured in counts per integration period, where the integration time is configurable. This driver adds support for both UV channels and the ultraviolet index (UVI) inferred from them according to the device application note with open-air (no teflon) coefficients. Signed-off-by: Javier Carrasco Link: https://lore.kernel.org/r/20231110-veml6075-v3-3-6ee46775b422@gmail.com Signed-off-by: Jonathan Cameron --- MAINTAINERS | 6 + drivers/iio/light/Kconfig | 11 + drivers/iio/light/Makefile | 1 + drivers/iio/light/veml6075.c | 474 +++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 492 insertions(+) create mode 100644 drivers/iio/light/veml6075.c (limited to 'drivers/iio/light') diff --git a/MAINTAINERS b/MAINTAINERS index cd9591df77d7..1338e1176ea5 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -23192,6 +23192,12 @@ S: Maintained F: drivers/input/serio/userio.c F: include/uapi/linux/userio.h +VISHAY VEML6075 UVA AND UVB LIGHT SENSOR DRIVER +M: Javier Carrasco +S: Maintained +F: Documentation/devicetree/bindings/iio/light/vishay,veml6075.yaml +F: drivers/iio/light/veml6075.c + VISL VIRTUAL STATELESS DECODER DRIVER M: Daniel Almeida L: linux-media@vger.kernel.org diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig index 45edba797e4c..f68e62196bc2 100644 --- a/drivers/iio/light/Kconfig +++ b/drivers/iio/light/Kconfig @@ -637,6 +637,17 @@ config VEML6070 To compile this driver as a module, choose M here: the module will be called veml6070. +config VEML6075 + tristate "VEML6075 UVA and UVB light sensor" + select REGMAP_I2C + depends on I2C + help + Say Y here if you want to build a driver for the Vishay VEML6075 UVA + and UVB light sensor. + + To compile this driver as a module, choose M here: the + module will be called veml6075. + config VL6180 tristate "VL6180 ALS, range and proximity sensor" depends on I2C diff --git a/drivers/iio/light/Makefile b/drivers/iio/light/Makefile index c0db4c4c36ec..c8289e24e3f6 100644 --- a/drivers/iio/light/Makefile +++ b/drivers/iio/light/Makefile @@ -60,5 +60,6 @@ obj-$(CONFIG_VCNL4000) += vcnl4000.o obj-$(CONFIG_VCNL4035) += vcnl4035.o obj-$(CONFIG_VEML6030) += veml6030.o obj-$(CONFIG_VEML6070) += veml6070.o +obj-$(CONFIG_VEML6075) += veml6075.o obj-$(CONFIG_VL6180) += vl6180.o obj-$(CONFIG_ZOPT2201) += zopt2201.o diff --git a/drivers/iio/light/veml6075.c b/drivers/iio/light/veml6075.c new file mode 100644 index 000000000000..05d4c0e9015d --- /dev/null +++ b/drivers/iio/light/veml6075.c @@ -0,0 +1,474 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Vishay VEML6075 UVA and UVB light sensor + * + * Copyright 2023 Javier Carrasco + * + * 7-bit I2C slave, address 0x10 + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#define VEML6075_CMD_CONF 0x00 /* configuration register */ +#define VEML6075_CMD_UVA 0x07 /* UVA channel */ +#define VEML6075_CMD_UVB 0x09 /* UVB channel */ +#define VEML6075_CMD_COMP1 0x0A /* visible light compensation */ +#define VEML6075_CMD_COMP2 0x0B /* infrarred light compensation */ +#define VEML6075_CMD_ID 0x0C /* device ID */ + +#define VEML6075_CONF_IT GENMASK(6, 4) /* intregration time */ +#define VEML6075_CONF_HD BIT(3) /* dynamic setting */ +#define VEML6075_CONF_TRIG BIT(2) /* trigger */ +#define VEML6075_CONF_AF BIT(1) /* active force enable */ +#define VEML6075_CONF_SD BIT(0) /* shutdown */ + +#define VEML6075_IT_50_MS 0x00 +#define VEML6075_IT_100_MS 0x01 +#define VEML6075_IT_200_MS 0x02 +#define VEML6075_IT_400_MS 0x03 +#define VEML6075_IT_800_MS 0x04 + +#define VEML6075_AF_DISABLE 0x00 +#define VEML6075_AF_ENABLE 0x01 + +#define VEML6075_SD_DISABLE 0x00 +#define VEML6075_SD_ENABLE 0x01 + +/* Open-air coefficients and responsivity */ +#define VEML6075_A_COEF 2220 +#define VEML6075_B_COEF 1330 +#define VEML6075_C_COEF 2950 +#define VEML6075_D_COEF 1740 +#define VEML6075_UVA_RESP 1461 +#define VEML6075_UVB_RESP 2591 + +static const int veml6075_it_ms[] = { 50, 100, 200, 400, 800 }; + +struct veml6075_data { + struct i2c_client *client; + struct regmap *regmap; + /* + * prevent integration time modification and triggering + * measurements while a measurement is underway. + */ + struct mutex lock; +}; + +/* channel number */ +enum veml6075_chan { + CH_UVA, + CH_UVB, +}; + +static const struct iio_chan_spec veml6075_channels[] = { + { + .type = IIO_INTENSITY, + .channel = CH_UVA, + .modified = 1, + .channel2 = IIO_MOD_LIGHT_UVA, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | + BIT(IIO_CHAN_INFO_SCALE), + .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_INT_TIME), + .info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_INT_TIME), + }, + { + .type = IIO_INTENSITY, + .channel = CH_UVB, + .modified = 1, + .channel2 = IIO_MOD_LIGHT_UVB, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | + BIT(IIO_CHAN_INFO_SCALE), + .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_INT_TIME), + .info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_INT_TIME), + }, + { + .type = IIO_UVINDEX, + .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), + .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_INT_TIME), + .info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_INT_TIME), + }, +}; + +static int veml6075_request_measurement(struct veml6075_data *data) +{ + int ret, conf, int_time; + + ret = regmap_read(data->regmap, VEML6075_CMD_CONF, &conf); + if (ret < 0) + return ret; + + /* disable shutdown and trigger measurement */ + ret = regmap_write(data->regmap, VEML6075_CMD_CONF, + (conf | VEML6075_CONF_TRIG) & ~VEML6075_CONF_SD); + if (ret < 0) + return ret; + + /* + * A measurement requires between 1.30 and 1.40 times the integration + * time for all possible configurations. Using a 1.50 factor simplifies + * operations and ensures reliability under all circumstances. + */ + int_time = veml6075_it_ms[FIELD_GET(VEML6075_CONF_IT, conf)]; + msleep(int_time + (int_time / 2)); + + /* shutdown again, data registers are still accessible */ + return regmap_update_bits(data->regmap, VEML6075_CMD_CONF, + VEML6075_CONF_SD, VEML6075_CONF_SD); +} + +static int veml6075_uva_comp(int raw_uva, int comp1, int comp2) +{ + int comp1a_c, comp2a_c, uva_comp; + + comp1a_c = (comp1 * VEML6075_A_COEF) / 1000U; + comp2a_c = (comp2 * VEML6075_B_COEF) / 1000U; + uva_comp = raw_uva - comp1a_c - comp2a_c; + + return clamp_val(uva_comp, 0, U16_MAX); +} + +static int veml6075_uvb_comp(int raw_uvb, int comp1, int comp2) +{ + int comp1b_c, comp2b_c, uvb_comp; + + comp1b_c = (comp1 * VEML6075_C_COEF) / 1000U; + comp2b_c = (comp2 * VEML6075_D_COEF) / 1000U; + uvb_comp = raw_uvb - comp1b_c - comp2b_c; + + return clamp_val(uvb_comp, 0, U16_MAX); +} + +static int veml6075_read_comp(struct veml6075_data *data, int *c1, int *c2) +{ + int ret; + + ret = regmap_read(data->regmap, VEML6075_CMD_COMP1, c1); + if (ret < 0) + return ret; + + return regmap_read(data->regmap, VEML6075_CMD_COMP2, c2); +} + +static int veml6075_read_uv_direct(struct veml6075_data *data, int chan, + int *val) +{ + int c1, c2, ret; + + guard(mutex)(&data->lock); + + ret = veml6075_request_measurement(data); + if (ret < 0) + return ret; + + ret = veml6075_read_comp(data, &c1, &c2); + if (ret < 0) + return ret; + + switch (chan) { + case CH_UVA: + ret = regmap_read(data->regmap, VEML6075_CMD_UVA, val); + if (ret < 0) + return ret; + + *val = veml6075_uva_comp(*val, c1, c2); + return IIO_VAL_INT; + case CH_UVB: + ret = regmap_read(data->regmap, VEML6075_CMD_UVB, val); + if (ret < 0) + return ret; + + *val = veml6075_uvb_comp(*val, c1, c2); + return IIO_VAL_INT; + default: + return -EINVAL; + } +} + +static int veml6075_read_int_time_index(struct veml6075_data *data) +{ + int ret, conf; + + ret = regmap_read(data->regmap, VEML6075_CMD_CONF, &conf); + if (ret < 0) + return ret; + + return FIELD_GET(VEML6075_CONF_IT, conf); +} + +static int veml6075_read_int_time_ms(struct veml6075_data *data, int *val) +{ + int int_index; + + guard(mutex)(&data->lock); + int_index = veml6075_read_int_time_index(data); + if (int_index < 0) + return int_index; + + *val = veml6075_it_ms[int_index]; + + return IIO_VAL_INT; +} + +static int veml6075_get_uvi_micro(struct veml6075_data *data, int uva_comp, + int uvb_comp) +{ + int uvia_micro = uva_comp * VEML6075_UVA_RESP; + int uvib_micro = uvb_comp * VEML6075_UVB_RESP; + int int_index; + + int_index = veml6075_read_int_time_index(data); + if (int_index < 0) + return int_index; + + switch (int_index) { + case VEML6075_IT_50_MS: + return uvia_micro + uvib_micro; + case VEML6075_IT_100_MS: + case VEML6075_IT_200_MS: + case VEML6075_IT_400_MS: + case VEML6075_IT_800_MS: + return (uvia_micro + uvib_micro) / (2 << int_index); + default: + return -EINVAL; + } +} + +static int veml6075_read_uvi(struct veml6075_data *data, int *val, int *val2) +{ + int ret, c1, c2, uva, uvb, uvi_micro; + + guard(mutex)(&data->lock); + + ret = veml6075_request_measurement(data); + if (ret < 0) + return ret; + + ret = veml6075_read_comp(data, &c1, &c2); + if (ret < 0) + return ret; + + ret = regmap_read(data->regmap, VEML6075_CMD_UVA, &uva); + if (ret < 0) + return ret; + + ret = regmap_read(data->regmap, VEML6075_CMD_UVB, &uvb); + if (ret < 0) + return ret; + + uvi_micro = veml6075_get_uvi_micro(data, veml6075_uva_comp(uva, c1, c2), + veml6075_uvb_comp(uvb, c1, c2)); + if (uvi_micro < 0) + return uvi_micro; + + *val = uvi_micro / MICRO; + *val2 = uvi_micro % MICRO; + + return IIO_VAL_INT_PLUS_MICRO; +} + +static int veml6075_read_responsivity(int chan, int *val, int *val2) +{ + /* scale = 1 / resp */ + switch (chan) { + case CH_UVA: + /* resp = 0.93 c/uW/cm2: scale = 1.75268817 */ + *val = 1; + *val2 = 75268817; + return IIO_VAL_INT_PLUS_NANO; + case CH_UVB: + /* resp = 2.1 c/uW/cm2: scale = 0.476190476 */ + *val = 0; + *val2 = 476190476; + return IIO_VAL_INT_PLUS_NANO; + default: + return -EINVAL; + } +} + +static int veml6075_read_avail(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + const int **vals, int *type, int *length, + long mask) +{ + switch (mask) { + case IIO_CHAN_INFO_INT_TIME: + *length = ARRAY_SIZE(veml6075_it_ms); + *vals = veml6075_it_ms; + *type = IIO_VAL_INT; + return IIO_AVAIL_LIST; + + default: + return -EINVAL; + } +} + +static int veml6075_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, int *val2, long mask) +{ + struct veml6075_data *data = iio_priv(indio_dev); + + switch (mask) { + case IIO_CHAN_INFO_RAW: + return veml6075_read_uv_direct(data, chan->channel, val); + case IIO_CHAN_INFO_PROCESSED: + return veml6075_read_uvi(data, val, val2); + case IIO_CHAN_INFO_INT_TIME: + return veml6075_read_int_time_ms(data, val); + case IIO_CHAN_INFO_SCALE: + return veml6075_read_responsivity(chan->channel, val, val2); + default: + return -EINVAL; + } +} + +static int veml6075_write_int_time_ms(struct veml6075_data *data, int val) +{ + int i = ARRAY_SIZE(veml6075_it_ms); + + guard(mutex)(&data->lock); + + while (i-- > 0) { + if (val == veml6075_it_ms[i]) + break; + } + if (i < 0) + return -EINVAL; + + return regmap_update_bits(data->regmap, VEML6075_CMD_CONF, + VEML6075_CONF_IT, + FIELD_PREP(VEML6075_CONF_IT, i)); +} + +static int veml6075_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int val, int val2, long mask) +{ + struct veml6075_data *data = iio_priv(indio_dev); + + switch (mask) { + case IIO_CHAN_INFO_INT_TIME: + return veml6075_write_int_time_ms(data, val); + default: + return -EINVAL; + } +} + +static const struct iio_info veml6075_info = { + .read_avail = veml6075_read_avail, + .read_raw = veml6075_read_raw, + .write_raw = veml6075_write_raw, +}; + +static bool veml6075_readable_reg(struct device *dev, unsigned int reg) +{ + switch (reg) { + case VEML6075_CMD_CONF: + case VEML6075_CMD_UVA: + case VEML6075_CMD_UVB: + case VEML6075_CMD_COMP1: + case VEML6075_CMD_COMP2: + case VEML6075_CMD_ID: + return true; + default: + return false; + } +} + +static bool veml6075_writable_reg(struct device *dev, unsigned int reg) +{ + switch (reg) { + case VEML6075_CMD_CONF: + return true; + default: + return false; + } +} + +static const struct regmap_config veml6075_regmap_config = { + .name = "veml6075", + .reg_bits = 8, + .val_bits = 16, + .max_register = VEML6075_CMD_ID, + .readable_reg = veml6075_readable_reg, + .writeable_reg = veml6075_writable_reg, + .val_format_endian = REGMAP_ENDIAN_LITTLE, +}; + +static int veml6075_probe(struct i2c_client *client) +{ + struct veml6075_data *data; + struct iio_dev *indio_dev; + struct regmap *regmap; + int config, ret; + + indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); + if (!indio_dev) + return -ENOMEM; + + regmap = devm_regmap_init_i2c(client, &veml6075_regmap_config); + if (IS_ERR(regmap)) + return PTR_ERR(regmap); + + data = iio_priv(indio_dev); + data->client = client; + data->regmap = regmap; + + mutex_init(&data->lock); + + indio_dev->name = "veml6075"; + indio_dev->info = &veml6075_info; + indio_dev->channels = veml6075_channels; + indio_dev->num_channels = ARRAY_SIZE(veml6075_channels); + indio_dev->modes = INDIO_DIRECT_MODE; + + ret = devm_regulator_get_enable(&client->dev, "vdd"); + if (ret < 0) + return ret; + + /* default: 100ms integration time, active force enable, shutdown */ + config = FIELD_PREP(VEML6075_CONF_IT, VEML6075_IT_100_MS) | + FIELD_PREP(VEML6075_CONF_AF, VEML6075_AF_ENABLE) | + FIELD_PREP(VEML6075_CONF_SD, VEML6075_SD_ENABLE); + ret = regmap_write(data->regmap, VEML6075_CMD_CONF, config); + if (ret < 0) + return ret; + + return devm_iio_device_register(&client->dev, indio_dev); +} + +static const struct i2c_device_id veml6075_id[] = { + { "veml6075" }, + { } +}; +MODULE_DEVICE_TABLE(i2c, veml6075_id); + +static const struct of_device_id veml6075_of_match[] = { + { .compatible = "vishay,veml6075" }, + {} +}; +MODULE_DEVICE_TABLE(of, veml6075_of_match); + +static struct i2c_driver veml6075_driver = { + .driver = { + .name = "veml6075", + .of_match_table = veml6075_of_match, + }, + .probe = veml6075_probe, + .id_table = veml6075_id, +}; + +module_i2c_driver(veml6075_driver); + +MODULE_AUTHOR("Javier Carrasco "); +MODULE_DESCRIPTION("Vishay VEML6075 UVA and UVB light sensor driver"); +MODULE_LICENSE("GPL"); -- cgit v1.2.3-58-ga151 From 4347f5114ab776c60727f94a7ab19538401c9ee1 Mon Sep 17 00:00:00 2001 From: Marek Vasut Date: Mon, 27 Nov 2023 22:26:53 +0100 Subject: iio: light: isl76682: Add ISL76682 driver The ISL76682 is very basic ALS which only supports ALS or IR mode in four ranges, 1k/4k/16k/64k LUX. There is no IRQ support or any other fancy functionality. Reviewed-by: Andy Shevchenko Reviewed-by: Matti Vaittinen Signed-off-by: Marek Vasut Link: https://lore.kernel.org/r/20231127212726.77707-2-marex@denx.de Signed-off-by: Jonathan Cameron --- drivers/iio/light/Kconfig | 15 ++ drivers/iio/light/Makefile | 1 + drivers/iio/light/isl76682.c | 346 +++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 362 insertions(+) create mode 100644 drivers/iio/light/isl76682.c (limited to 'drivers/iio/light') diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig index f68e62196bc2..9ac6c737207f 100644 --- a/drivers/iio/light/Kconfig +++ b/drivers/iio/light/Kconfig @@ -252,6 +252,21 @@ config ISL29125 To compile this driver as a module, choose M here: the module will be called isl29125. +config ISL76682 + tristate "Intersil ISL76682 Light Sensor" + depends on I2C + select REGMAP_I2C + help + Say Y here if you want to build a driver for the Intersil ISL76682 + Ambient Light Sensor and IR Intensity sensor. This driver provides + the readouts via standard IIO sysfs and device interface. Both ALS + illuminance and IR illuminance are provided raw with separate scale + setting which can be configured via sysfs, the default scale is 1000 + lux, other options are 4000/16000/64000 lux. + + To compile this driver as a module, choose M here: the module will be + called isl76682. + config HID_SENSOR_ALS depends on HID_SENSOR_HUB select IIO_BUFFER diff --git a/drivers/iio/light/Makefile b/drivers/iio/light/Makefile index c8289e24e3f6..4aa0835ece5d 100644 --- a/drivers/iio/light/Makefile +++ b/drivers/iio/light/Makefile @@ -28,6 +28,7 @@ obj-$(CONFIG_IQS621_ALS) += iqs621-als.o obj-$(CONFIG_SENSORS_ISL29018) += isl29018.o obj-$(CONFIG_SENSORS_ISL29028) += isl29028.o obj-$(CONFIG_ISL29125) += isl29125.o +obj-$(CONFIG_ISL76682) += isl76682.o obj-$(CONFIG_JSA1212) += jsa1212.o obj-$(CONFIG_SENSORS_LM3533) += lm3533-als.o obj-$(CONFIG_LTR501) += ltr501.o diff --git a/drivers/iio/light/isl76682.c b/drivers/iio/light/isl76682.c new file mode 100644 index 000000000000..0a7c3b09c3c0 --- /dev/null +++ b/drivers/iio/light/isl76682.c @@ -0,0 +1,346 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * IIO driver for the light sensor ISL76682. + * ISL76682 is Ambient Light Sensor + * + * Copyright (c) 2023 Marek Vasut + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#define ISL76682_REG_COMMAND 0x00 + +#define ISL76682_COMMAND_EN BIT(7) +#define ISL76682_COMMAND_MODE_CONTINUOUS BIT(6) +#define ISL76682_COMMAND_LIGHT_IR BIT(5) + +#define ISL76682_COMMAND_RANGE_LUX_1K 0x0 +#define ISL76682_COMMAND_RANGE_LUX_4K 0x1 +#define ISL76682_COMMAND_RANGE_LUX_16K 0x2 +#define ISL76682_COMMAND_RANGE_LUX_64K 0x3 +#define ISL76682_COMMAND_RANGE_LUX_MASK GENMASK(1, 0) + +#define ISL76682_REG_ALSIR_L 0x01 + +#define ISL76682_REG_ALSIR_U 0x02 + +#define ISL76682_NUM_REGS (ISL76682_REG_ALSIR_U + 1) + +#define ISL76682_CONV_TIME_MS 100 +#define ISL76682_INT_TIME_US 90000 + +#define ISL76682_ADC_MAX (BIT(16) - 1) + +struct isl76682_chip { + /* + * Lock to synchronize access to device command register + * and the content of range variable below. + */ + struct mutex lock; + struct regmap *regmap; + u8 range; + u8 command; +}; + +struct isl76682_range { + u8 range; + u32 als; + u32 ir; +}; + +static struct isl76682_range isl76682_range_table[] = { + { ISL76682_COMMAND_RANGE_LUX_1K, 15000, 10500 }, + { ISL76682_COMMAND_RANGE_LUX_4K, 60000, 42000 }, + { ISL76682_COMMAND_RANGE_LUX_16K, 240000, 168000 }, + { ISL76682_COMMAND_RANGE_LUX_64K, 960000, 673000 } +}; + +static int isl76682_get(struct isl76682_chip *chip, bool mode_ir, int *data) +{ + u8 command; + int ret; + + command = ISL76682_COMMAND_EN | ISL76682_COMMAND_MODE_CONTINUOUS | + chip->range; + + if (mode_ir) + command |= ISL76682_COMMAND_LIGHT_IR; + + if (command != chip->command) { + ret = regmap_write(chip->regmap, ISL76682_REG_COMMAND, command); + if (ret) + return ret; + + /* Need to wait for conversion time if ALS/IR mode enabled */ + msleep(ISL76682_CONV_TIME_MS); + + chip->command = command; + } + + ret = regmap_bulk_read(chip->regmap, ISL76682_REG_ALSIR_L, data, 2); + *data &= ISL76682_ADC_MAX; + return ret; +} + +static int isl76682_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int val, int val2, long mask) +{ + struct isl76682_chip *chip = iio_priv(indio_dev); + int i; + + if (mask != IIO_CHAN_INFO_SCALE) + return -EINVAL; + + if (val != 0) + return -EINVAL; + + for (i = 0; i < ARRAY_SIZE(isl76682_range_table); i++) { + if (chan->type == IIO_LIGHT && val2 != isl76682_range_table[i].als) + continue; + if (chan->type == IIO_INTENSITY && val2 != isl76682_range_table[i].ir) + continue; + + scoped_guard(mutex, &chip->lock) + chip->range = isl76682_range_table[i].range; + return 0; + } + + return -EINVAL; +} + +static int isl76682_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, int *val2, long mask) +{ + struct isl76682_chip *chip = iio_priv(indio_dev); + int ret; + int i; + + guard(mutex)(&chip->lock); + + switch (mask) { + case IIO_CHAN_INFO_RAW: + switch (chan->type) { + case IIO_LIGHT: + ret = isl76682_get(chip, false, val); + return (ret < 0) ? ret : IIO_VAL_INT; + case IIO_INTENSITY: + ret = isl76682_get(chip, true, val); + return (ret < 0) ? ret : IIO_VAL_INT; + default: + return -EINVAL; + } + return -EINVAL; + case IIO_CHAN_INFO_SCALE: + for (i = 0; i < ARRAY_SIZE(isl76682_range_table); i++) { + if (chip->range != isl76682_range_table[i].range) + continue; + + *val = 0; + switch (chan->type) { + case IIO_LIGHT: + *val2 = isl76682_range_table[i].als; + return IIO_VAL_INT_PLUS_MICRO; + case IIO_INTENSITY: + *val2 = isl76682_range_table[i].ir; + return IIO_VAL_INT_PLUS_MICRO; + default: + return -EINVAL; + } + } + return -EINVAL; + case IIO_CHAN_INFO_INT_TIME: + *val = 0; + *val2 = ISL76682_INT_TIME_US; + return IIO_VAL_INT_PLUS_MICRO; + default: + return -EINVAL; + } +} + +static int illuminance_scale_available[] = { + 0, 15000, + 0, 60000, + 0, 240000, + 0, 960000, +}; + +static int intensity_scale_available[] = { + 0, 10500, + 0, 42000, + 0, 168000, + 0, 673000, +}; + +static int isl76682_read_avail(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + const int **vals, int *type, + int *length, long mask) +{ + switch (mask) { + case IIO_CHAN_INFO_SCALE: + switch (chan->type) { + case IIO_LIGHT: + *vals = illuminance_scale_available; + *length = ARRAY_SIZE(illuminance_scale_available); + *type = IIO_VAL_INT_PLUS_MICRO; + return IIO_AVAIL_LIST; + case IIO_INTENSITY: + *vals = intensity_scale_available; + *length = ARRAY_SIZE(intensity_scale_available); + *type = IIO_VAL_INT_PLUS_MICRO; + return IIO_AVAIL_LIST; + default: + return -EINVAL; + } + default: + return -EINVAL; + } +} + +static const struct iio_chan_spec isl76682_channels[] = { + { + .type = IIO_LIGHT, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | + BIT(IIO_CHAN_INFO_SCALE), + .info_mask_shared_by_type_available = BIT(IIO_CHAN_INFO_SCALE), + .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_INT_TIME), + }, { + .type = IIO_INTENSITY, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | + BIT(IIO_CHAN_INFO_SCALE), + .info_mask_shared_by_type_available = BIT(IIO_CHAN_INFO_SCALE), + .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_INT_TIME), + } +}; + +static const struct iio_info isl76682_info = { + .read_avail = isl76682_read_avail, + .read_raw = isl76682_read_raw, + .write_raw = isl76682_write_raw, +}; + +static int isl76682_clear_configure_reg(struct isl76682_chip *chip) +{ + struct device *dev = regmap_get_device(chip->regmap); + int ret; + + ret = regmap_write(chip->regmap, ISL76682_REG_COMMAND, 0x0); + if (ret < 0) + dev_err(dev, "Error %d clearing the CONFIGURE register\n", ret); + + /* + * In the success case, the command register was zeroed out. + * + * In the error case, we do not know in which state the command + * register is, so we assume it is zeroed out, so that it would + * be reprogrammed at the next data read out, and at that time + * we hope it would be reprogrammed successfully. That is very + * much a best effort approach. + */ + chip->command = 0; + + return ret; +} + +static void isl76682_reset_action(void *chip) +{ + isl76682_clear_configure_reg(chip); +} + +static bool isl76682_is_volatile_reg(struct device *dev, unsigned int reg) +{ + switch (reg) { + case ISL76682_REG_ALSIR_L: + case ISL76682_REG_ALSIR_U: + return true; + default: + return false; + } +} + +static const struct regmap_config isl76682_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .volatile_reg = isl76682_is_volatile_reg, + .max_register = ISL76682_NUM_REGS - 1, + .num_reg_defaults_raw = ISL76682_NUM_REGS, + .cache_type = REGCACHE_FLAT, +}; + +static int isl76682_probe(struct i2c_client *client) +{ + struct device *dev = &client->dev; + struct isl76682_chip *chip; + struct iio_dev *indio_dev; + int ret; + + indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*chip)); + if (!indio_dev) + return -ENOMEM; + + chip = iio_priv(indio_dev); + + mutex_init(&chip->lock); + + chip->regmap = devm_regmap_init_i2c(client, &isl76682_regmap_config); + ret = PTR_ERR_OR_ZERO(chip->regmap); + if (ret) + return dev_err_probe(dev, ret, "Error initializing regmap\n"); + + chip->range = ISL76682_COMMAND_RANGE_LUX_1K; + + ret = isl76682_clear_configure_reg(chip); + if (ret < 0) + return ret; + + ret = devm_add_action_or_reset(dev, isl76682_reset_action, chip); + if (ret) + return ret; + + indio_dev->info = &isl76682_info; + indio_dev->channels = isl76682_channels; + indio_dev->num_channels = ARRAY_SIZE(isl76682_channels); + indio_dev->name = "isl76682"; + indio_dev->modes = INDIO_DIRECT_MODE; + + return devm_iio_device_register(dev, indio_dev); +} + +static const struct i2c_device_id isl76682_id[] = { + { "isl76682" }, + { } +}; +MODULE_DEVICE_TABLE(i2c, isl76682_id); + +static const struct of_device_id isl76682_of_match[] = { + { .compatible = "isil,isl76682" }, + { } +}; +MODULE_DEVICE_TABLE(of, isl76682_of_match); + +static struct i2c_driver isl76682_driver = { + .driver = { + .name = "isl76682", + .of_match_table = isl76682_of_match, + }, + .probe = isl76682_probe, + .id_table = isl76682_id, +}; +module_i2c_driver(isl76682_driver); + +MODULE_DESCRIPTION("ISL76682 Ambient Light Sensor driver"); +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Marek Vasut "); -- cgit v1.2.3-58-ga151 From 9f4e9ffee97414d882889a943e550c53b5fa1d5c Mon Sep 17 00:00:00 2001 From: Jonathan Cameron Date: Thu, 16 Nov 2023 19:27:11 +0000 Subject: iio: light: pa1203001: Drop ACPI_PTR() protection. The extra cost of always including the acpi_device_id table is trivial vs the complexity of adding guards or __maybe_unused markings so just stop using the ACPI_PTR() macro. Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202311160851.FDA4CDVE-lkp@intel.com/ Link: https://lore.kernel.org/r/20231116192711.366441-1-jic23@kernel.org Signed-off-by: Jonathan Cameron --- drivers/iio/light/pa12203001.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/iio/light') diff --git a/drivers/iio/light/pa12203001.c b/drivers/iio/light/pa12203001.c index ed241598aefb..636432c45651 100644 --- a/drivers/iio/light/pa12203001.c +++ b/drivers/iio/light/pa12203001.c @@ -472,7 +472,7 @@ static struct i2c_driver pa12203001_driver = { .driver = { .name = PA12203001_DRIVER_NAME, .pm = &pa12203001_pm_ops, - .acpi_match_table = ACPI_PTR(pa12203001_acpi_match), + .acpi_match_table = pa12203001_acpi_match, }, .probe = pa12203001_probe, .remove = pa12203001_remove, -- cgit v1.2.3-58-ga151 From c95e0a719820054b28ef8687cc05b8deeb1c9106 Mon Sep 17 00:00:00 2001 From: Jiapeng Chong Date: Fri, 8 Dec 2023 10:17:15 +0800 Subject: iio: light: isl76682: remove unreachable code The function isl76682_read_raw cannot execute return -EINVAL up to 145 lines, delete the invalid code. drivers/iio/light/isl76682.c:145 isl76682_read_raw() warn: ignoring unreachable code. Reported-by: Abaci Robot Closes: https://bugzilla.openanolis.cn/show_bug.cgi?id=7698 Signed-off-by: Jiapeng Chong Link: https://lore.kernel.org/r/20231208021715.32450-1-jiapeng.chong@linux.alibaba.com Signed-off-by: Jonathan Cameron --- drivers/iio/light/isl76682.c | 1 - 1 file changed, 1 deletion(-) (limited to 'drivers/iio/light') diff --git a/drivers/iio/light/isl76682.c b/drivers/iio/light/isl76682.c index 0a7c3b09c3c0..cf6ddee44ffc 100644 --- a/drivers/iio/light/isl76682.c +++ b/drivers/iio/light/isl76682.c @@ -142,7 +142,6 @@ static int isl76682_read_raw(struct iio_dev *indio_dev, default: return -EINVAL; } - return -EINVAL; case IIO_CHAN_INFO_SCALE: for (i = 0; i < ARRAY_SIZE(isl76682_range_table); i++) { if (chip->range != isl76682_range_table[i].range) -- cgit v1.2.3-58-ga151 From 8b0d4c40d704cb7d01ad4f647ff5a51881767acd Mon Sep 17 00:00:00 2001 From: Anshul Dalal Date: Fri, 8 Dec 2023 15:52:10 +0530 Subject: iio: light: driver for Lite-On ltr390 Implements driver for the Ambient/UV Light sensor LTR390. The driver exposes two ways of getting sensor readings: 1. Raw UV Counts directly from the sensor 2. The computed UV Index value with a percision of 2 decimal places [NOTE] Ambient light sensing has not been implemented yet. Driver tested on RPi Zero 2W Datasheet: https://optoelectronics.liteon.com/upload/download/DS86-2015-0004/LTR-390UV_Final_%20DS_V1%201.pdf Signed-off-by: Anshul Dalal Link: https://lore.kernel.org/r/20231208102211.413019-2-anshulusr@gmail.com Signed-off-by: Jonathan Cameron --- MAINTAINERS | 7 ++ drivers/iio/light/Kconfig | 11 +++ drivers/iio/light/Makefile | 1 + drivers/iio/light/ltr390.c | 196 +++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 215 insertions(+) create mode 100644 drivers/iio/light/ltr390.c (limited to 'drivers/iio/light') diff --git a/MAINTAINERS b/MAINTAINERS index cf1ce6e6c1e1..4eddc4212f2b 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -12663,6 +12663,13 @@ S: Maintained W: http://linux-test-project.github.io/ T: git https://github.com/linux-test-project/ltp.git +LTR390 AMBIENT/UV LIGHT SENSOR DRIVER +M: Anshul Dalal +L: linux-iio@vger.kernel.org +S: Maintained +F: Documentation/devicetree/bindings/iio/light/liteon,ltr390.yaml +F: drivers/iio/light/ltr390.c + LYNX 28G SERDES PHY DRIVER M: Ioana Ciornei L: netdev@vger.kernel.org diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig index 9ac6c737207f..143003232d1c 100644 --- a/drivers/iio/light/Kconfig +++ b/drivers/iio/light/Kconfig @@ -362,6 +362,17 @@ config SENSORS_LM3533 changes. The ALS-control output values can be set per zone for the three current output channels. +config LTR390 + tristate "LTR-390UV-01 ambient light and UV sensor" + depends on I2C + select REGMAP_I2C + help + If you say yes here you get support for the Lite-On LTR-390UV-01 + ambient light and UV sensor. + + This driver can also be built as a module. If so, the module + will be called ltr390. + config LTR501 tristate "LTR-501ALS-01 light sensor" depends on I2C diff --git a/drivers/iio/light/Makefile b/drivers/iio/light/Makefile index 4aa0835ece5d..2e5fdb33e0e9 100644 --- a/drivers/iio/light/Makefile +++ b/drivers/iio/light/Makefile @@ -31,6 +31,7 @@ obj-$(CONFIG_ISL29125) += isl29125.o obj-$(CONFIG_ISL76682) += isl76682.o obj-$(CONFIG_JSA1212) += jsa1212.o obj-$(CONFIG_SENSORS_LM3533) += lm3533-als.o +obj-$(CONFIG_LTR390) += ltr390.o obj-$(CONFIG_LTR501) += ltr501.o obj-$(CONFIG_LTRF216A) += ltrf216a.o obj-$(CONFIG_LV0104CS) += lv0104cs.o diff --git a/drivers/iio/light/ltr390.c b/drivers/iio/light/ltr390.c new file mode 100644 index 000000000000..fff1e899097d --- /dev/null +++ b/drivers/iio/light/ltr390.c @@ -0,0 +1,196 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * IIO driver for Lite-On LTR390 ALS and UV sensor + * (7-bit I2C slave address 0x53) + * + * Based on the work of: + * Shreeya Patel and Shi Zhigang (LTRF216 Driver) + * + * Copyright (C) 2023 Anshul Dalal + * + * Datasheet: + * https://optoelectronics.liteon.com/upload/download/DS86-2015-0004/LTR-390UV_Final_%20DS_V1%201.pdf + * + * TODO: + * - Support for configurable gain and resolution + * - Sensor suspend/resume support + * - Add support for reading the ALS + * - Interrupt support + */ + +#include +#include +#include +#include +#include + +#include + +#include + +#define LTR390_MAIN_CTRL 0x00 +#define LTR390_PART_ID 0x06 +#define LTR390_UVS_DATA 0x10 + +#define LTR390_SW_RESET BIT(4) +#define LTR390_UVS_MODE BIT(3) +#define LTR390_SENSOR_ENABLE BIT(1) + +#define LTR390_PART_NUMBER_ID 0xb + +/* + * At 20-bit resolution (integration time: 400ms) and 18x gain, 2300 counts of + * the sensor are equal to 1 UV Index [Datasheet Page#8]. + * + * For the default resolution of 18-bit (integration time: 100ms) and default + * gain of 3x, the counts/uvi are calculated as follows: + * 2300 / ((3/18) * (100/400)) = 95.83 + */ +#define LTR390_COUNTS_PER_UVI 96 + +/* + * Window Factor is needed when the device is under Window glass with coated + * tinted ink. This is to compensate for the light loss due to the lower + * transmission rate of the window glass and helps * in calculating lux. + */ +#define LTR390_WINDOW_FACTOR 1 + +struct ltr390_data { + struct regmap *regmap; + struct i2c_client *client; + /* Protects device from simulataneous reads */ + struct mutex lock; +}; + +static const struct regmap_config ltr390_regmap_config = { + .name = "ltr390", + .reg_bits = 8, + .reg_stride = 1, + .val_bits = 8, +}; + +static int ltr390_register_read(struct ltr390_data *data, u8 register_address) +{ + struct device *dev = &data->client->dev; + int ret; + u8 recieve_buffer[3]; + + guard(mutex)(&data->lock); + + ret = regmap_bulk_read(data->regmap, register_address, recieve_buffer, + sizeof(recieve_buffer)); + if (ret) { + dev_err(dev, "failed to read measurement data"); + return ret; + } + + return get_unaligned_le24(recieve_buffer); +} + +static int ltr390_read_raw(struct iio_dev *iio_device, + struct iio_chan_spec const *chan, int *val, + int *val2, long mask) +{ + int ret; + struct ltr390_data *data = iio_priv(iio_device); + + switch (mask) { + case IIO_CHAN_INFO_RAW: + ret = ltr390_register_read(data, LTR390_UVS_DATA); + if (ret < 0) + return ret; + *val = ret; + return IIO_VAL_INT; + case IIO_CHAN_INFO_SCALE: + *val = LTR390_WINDOW_FACTOR; + *val2 = LTR390_COUNTS_PER_UVI; + return IIO_VAL_FRACTIONAL; + default: + return -EINVAL; + } +} + +static const struct iio_info ltr390_info = { + .read_raw = ltr390_read_raw, +}; + +static const struct iio_chan_spec ltr390_channel = { + .type = IIO_UVINDEX, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE) +}; + +static int ltr390_probe(struct i2c_client *client) +{ + struct ltr390_data *data; + struct iio_dev *indio_dev; + struct device *dev; + int ret, part_number; + + dev = &client->dev; + indio_dev = devm_iio_device_alloc(dev, sizeof(*data)); + if (!indio_dev) + return -ENOMEM; + + data = iio_priv(indio_dev); + + data->regmap = devm_regmap_init_i2c(client, <r390_regmap_config); + if (IS_ERR(data->regmap)) + return dev_err_probe(dev, PTR_ERR(data->regmap), + "regmap initialization failed\n"); + + data->client = client; + mutex_init(&data->lock); + + indio_dev->info = <r390_info; + indio_dev->channels = <r390_channel; + indio_dev->num_channels = 1; + indio_dev->name = "ltr390"; + + ret = regmap_read(data->regmap, LTR390_PART_ID, &part_number); + if (ret) + return dev_err_probe(dev, ret, + "failed to get sensor's part id\n"); + /* Lower 4 bits of `part_number` change with hardware revisions */ + if (part_number >> 4 != LTR390_PART_NUMBER_ID) + dev_info(dev, "received invalid product id: 0x%x", part_number); + dev_dbg(dev, "LTR390, product id: 0x%x\n", part_number); + + /* reset sensor, chip fails to respond to this, so ignore any errors */ + regmap_set_bits(data->regmap, LTR390_MAIN_CTRL, LTR390_SW_RESET); + + /* Wait for the registers to reset before proceeding */ + usleep_range(1000, 2000); + + ret = regmap_set_bits(data->regmap, LTR390_MAIN_CTRL, + LTR390_SENSOR_ENABLE | LTR390_UVS_MODE); + if (ret) + return dev_err_probe(dev, ret, "failed to enable the sensor\n"); + + return devm_iio_device_register(dev, indio_dev); +} + +static const struct i2c_device_id ltr390_id[] = { + { "ltr390" }, + { /* Sentinel */ } +}; +MODULE_DEVICE_TABLE(i2c, ltr390_id); + +static const struct of_device_id ltr390_of_table[] = { + { .compatible = "liteon,ltr390" }, + { /* Sentinel */ } +}; +MODULE_DEVICE_TABLE(of, ltr390_of_table); + +static struct i2c_driver ltr390_driver = { + .driver = { + .name = "ltr390", + .of_match_table = ltr390_of_table, + }, + .probe = ltr390_probe, + .id_table = ltr390_id, +}; +module_i2c_driver(ltr390_driver); + +MODULE_AUTHOR("Anshul Dalal "); +MODULE_DESCRIPTION("Lite-On LTR390 ALS and UV sensor Driver"); +MODULE_LICENSE("GPL"); -- cgit v1.2.3-58-ga151