diff options
| -rw-r--r-- | drivers/mfd/Kconfig | 14 | ||||
| -rw-r--r-- | drivers/mfd/Makefile | 1 | ||||
| -rw-r--r-- | drivers/mfd/tps6586x.c | 375 | ||||
| -rw-r--r-- | include/linux/mfd/tps6586x.h | 47 |
4 files changed, 437 insertions, 0 deletions
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index 23a891f396e4..d75909e7cf2f 100644 --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig @@ -531,6 +531,20 @@ config MFD_JZ4740_ADC Say yes here if you want support for the ADC unit in the JZ4740 SoC. This driver is necessary for jz4740-battery and jz4740-hwmon driver. +config MFD_TPS6586X + tristate "TPS6586x Power Management chips" + depends on I2C && GPIOLIB + select MFD_CORE + help + If you say yes here you get support for the TPS6586X series of + Power Management chips. + This driver provides common support for accessing the device, + additional drivers must be enabled in order to use the + functionality of the device. + + This driver can also be built as a module. If so, the module + will be called tps6586x. + endif # MFD_SUPPORT menu "Multimedia Capabilities Port drivers" diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile index cc7cce0976f3..1e48d7e3e884 100644 --- a/drivers/mfd/Makefile +++ b/drivers/mfd/Makefile @@ -74,3 +74,4 @@ obj-$(CONFIG_LPC_SCH) += lpc_sch.o obj-$(CONFIG_MFD_RDC321X) += rdc321x-southbridge.o obj-$(CONFIG_MFD_JANZ_CMODIO) += janz-cmodio.o obj-$(CONFIG_MFD_JZ4740_ADC) += jz4740-adc.o +obj-$(CONFIG_MFD_TPS6586X) += tps6586x.o diff --git a/drivers/mfd/tps6586x.c b/drivers/mfd/tps6586x.c new file mode 100644 index 000000000000..4cde31e6a252 --- /dev/null +++ b/drivers/mfd/tps6586x.c @@ -0,0 +1,375 @@ +/* + * Core driver for TI TPS6586x PMIC family + * + * Copyright (c) 2010 CompuLab Ltd. + * Mike Rapoport <mike@compulab.co.il> + * + * Based on da903x.c. + * Copyright (C) 2008 Compulab, Ltd. + * Mike Rapoport <mike@compulab.co.il> + * Copyright (C) 2006-2008 Marvell International Ltd. + * Eric Miao <eric.miao@marvell.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/slab.h> +#include <linux/gpio.h> +#include <linux/i2c.h> + +#include <linux/mfd/core.h> +#include <linux/mfd/tps6586x.h> + +/* GPIO control registers */ +#define TPS6586X_GPIOSET1 0x5d +#define TPS6586X_GPIOSET2 0x5e + +/* device id */ +#define TPS6586X_VERSIONCRC 0xcd +#define TPS658621A_VERSIONCRC 0x15 + +struct tps6586x { + struct mutex lock; + struct device *dev; + struct i2c_client *client; + + struct gpio_chip gpio; +}; + +static inline int __tps6586x_read(struct i2c_client *client, + int reg, uint8_t *val) +{ + int ret; + + ret = i2c_smbus_read_byte_data(client, reg); + if (ret < 0) { + dev_err(&client->dev, "failed reading at 0x%02x\n", reg); + return ret; + } + + *val = (uint8_t)ret; + + return 0; +} + +static inline int __tps6586x_reads(struct i2c_client *client, int reg, + int len, uint8_t *val) +{ + int ret; + + ret = i2c_smbus_read_i2c_block_data(client, reg, len, val); + if (ret < 0) { + dev_err(&client->dev, "failed reading from 0x%02x\n", reg); + return ret; + } + + return 0; +} + +static inline int __tps6586x_write(struct i2c_client *client, + int reg, uint8_t val) +{ + int ret; + + ret = i2c_smbus_write_byte_data(client, reg, val); + if (ret < 0) { + dev_err(&client->dev, "failed writing 0x%02x to 0x%02x\n", + val, reg); + return ret; + } + + return 0; +} + +static inline int __tps6586x_writes(struct i2c_client *client, int reg, + int len, uint8_t *val) +{ + int ret; + + ret = i2c_smbus_write_i2c_block_data(client, reg, len, val); + if (ret < 0) { + dev_err(&client->dev, "failed writings to 0x%02x\n", reg); + return ret; + } + + return 0; +} + +int tps6586x_write(struct device *dev, int reg, uint8_t val) +{ + return __tps6586x_write(to_i2c_client(dev), reg, val); +} +EXPORT_SYMBOL_GPL(tps6586x_write); + +int tps6586x_writes(struct device *dev, int reg, int len, uint8_t *val) +{ + return __tps6586x_writes(to_i2c_client(dev), reg, len, val); +} +EXPORT_SYMBOL_GPL(tps6586x_writes); + +int tps6586x_read(struct device *dev, int reg, uint8_t *val) +{ + return __tps6586x_read(to_i2c_client(dev), reg, val); +} +EXPORT_SYMBOL_GPL(tps6586x_read); + +int tps6586x_reads(struct device *dev, int reg, int len, uint8_t *val) +{ + return __tps6586x_reads(to_i2c_client(dev), reg, len, val); +} +EXPORT_SYMBOL_GPL(tps6586x_reads); + +int tps6586x_set_bits(struct device *dev, int reg, uint8_t bit_mask) +{ + struct tps6586x *tps6586x = dev_get_drvdata(dev); + uint8_t reg_val; + int ret = 0; + + mutex_lock(&tps6586x->lock); + + ret = __tps6586x_read(to_i2c_client(dev), reg, ®_val); + if (ret) + goto out; + + if ((reg_val & bit_mask) == 0) { + reg_val |= bit_mask; + ret = __tps6586x_write(to_i2c_client(dev), reg, reg_val); + } +out: + mutex_unlock(&tps6586x->lock); + return ret; +} +EXPORT_SYMBOL_GPL(tps6586x_set_bits); + +int tps6586x_clr_bits(struct device *dev, int reg, uint8_t bit_mask) +{ + struct tps6586x *tps6586x = dev_get_drvdata(dev); + uint8_t reg_val; + int ret = 0; + + mutex_lock(&tps6586x->lock); + + ret = __tps6586x_read(to_i2c_client(dev), reg, ®_val); + if (ret) + goto out; + + if (reg_val & bit_mask) { + reg_val &= ~bit_mask; + ret = __tps6586x_write(to_i2c_client(dev), reg, reg_val); + } +out: + mutex_unlock(&tps6586x->lock); + return ret; +} +EXPORT_SYMBOL_GPL(tps6586x_clr_bits); + +int tps6586x_update(struct device *dev, int reg, uint8_t val, uint8_t mask) +{ + struct tps6586x *tps6586x = dev_get_drvdata(dev); + uint8_t reg_val; + int ret = 0; + + mutex_lock(&tps6586x->lock); + + ret = __tps6586x_read(tps6586x->client, reg, ®_val); + if (ret) + goto out; + + if ((reg_val & mask) != val) { + reg_val = (reg_val & ~mask) | val; + ret = __tps6586x_write(tps6586x->client, reg, reg_val); + } +out: + mutex_unlock(&tps6586x->lock); + return ret; +} +EXPORT_SYMBOL_GPL(tps6586x_update); + +static int tps6586x_gpio_get(struct gpio_chip *gc, unsigned offset) +{ + struct tps6586x *tps6586x = container_of(gc, struct tps6586x, gpio); + uint8_t val; + int ret; + + ret = __tps6586x_read(tps6586x->client, TPS6586X_GPIOSET2, &val); + if (ret) + return ret; + + return !!(val & (1 << offset)); +} + + +static void tps6586x_gpio_set(struct gpio_chip *chip, unsigned offset, + int value) +{ + struct tps6586x *tps6586x = container_of(chip, struct tps6586x, gpio); + + __tps6586x_write(tps6586x->client, TPS6586X_GPIOSET2, + value << offset); +} + +static int tps6586x_gpio_output(struct gpio_chip *gc, unsigned offset, + int value) +{ + struct tps6586x *tps6586x = container_of(gc, struct tps6586x, gpio); + uint8_t val, mask; + + tps6586x_gpio_set(gc, offset, value); + + val = 0x1 << (offset * 2); + mask = 0x3 << (offset * 2); + + return tps6586x_update(tps6586x->dev, TPS6586X_GPIOSET1, val, mask); +} + +static void tps6586x_gpio_init(struct tps6586x *tps6586x, int gpio_base) +{ + int ret; + + if (!gpio_base) + return; + + tps6586x->gpio.owner = THIS_MODULE; + tps6586x->gpio.label = tps6586x->client->name; + tps6586x->gpio.dev = tps6586x->dev; + tps6586x->gpio.base = gpio_base; + tps6586x->gpio.ngpio = 4; + tps6586x->gpio.can_sleep = 1; + + /* FIXME: add handling of GPIOs as dedicated inputs */ + tps6586x->gpio.direction_output = tps6586x_gpio_output; + tps6586x->gpio.set = tps6586x_gpio_set; + tps6586x->gpio.get = tps6586x_gpio_get; + + ret = gpiochip_add(&tps6586x->gpio); + if (ret) + dev_warn(tps6586x->dev, "GPIO registration failed: %d\n", ret); +} + +static int __remove_subdev(struct device *dev, void *unused) +{ + platform_device_unregister(to_platform_device(dev)); + return 0; +} + +static int tps6586x_remove_subdevs(struct tps6586x *tps6586x) +{ + return device_for_each_child(tps6586x->dev, NULL, __remove_subdev); +} + +static int __devinit tps6586x_add_subdevs(struct tps6586x *tps6586x, + struct tps6586x_platform_data *pdata) +{ + struct tps6586x_subdev_info *subdev; + struct platform_device *pdev; + int i, ret = 0; + + for (i = 0; i < pdata->num_subdevs; i++) { + subdev = &pdata->subdevs[i]; + + pdev = platform_device_alloc(subdev->name, subdev->id); + + pdev->dev.parent = tps6586x->dev; + pdev->dev.platform_data = subdev->platform_data; + + ret = platform_device_add(pdev); + if (ret) + goto failed; + } + return 0; + +failed: + tps6586x_remove_subdevs(tps6586x); + return ret; +} + +static int __devinit tps6586x_i2c_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct tps6586x_platform_data *pdata = client->dev.platform_data; + struct tps6586x *tps6586x; + int ret; + + if (!pdata) { + dev_err(&client->dev, "tps6586x requires platform data\n"); + return -ENOTSUPP; + } + + ret = i2c_smbus_read_byte_data(client, TPS6586X_VERSIONCRC); + if (ret < 0) { + dev_err(&client->dev, "Chip ID read failed: %d\n", ret); + return -EIO; + } + + if (ret != TPS658621A_VERSIONCRC) { + dev_err(&client->dev, "Unsupported chip ID: %x\n", ret); + return -ENODEV; + } + + tps6586x = kzalloc(sizeof(struct tps6586x), GFP_KERNEL); + if (tps6586x == NULL) + return -ENOMEM; + + tps6586x->client = client; + tps6586x->dev = &client->dev; + i2c_set_clientdata(client, tps6586x); + + mutex_init(&tps6586x->lock); + + ret = tps6586x_add_subdevs(tps6586x, pdata); + if (ret) { + dev_err(&client->dev, "add devices failed: %d\n", ret); + goto err_add_devs; + } + + tps6586x_gpio_init(tps6586x, pdata->gpio_base); + + return 0; + +err_add_devs: + kfree(tps6586x); + return ret; +} + +static int __devexit tps6586x_i2c_remove(struct i2c_client *client) +{ + return 0; +} + +static const struct i2c_device_id tps6586x_id_table[] = { + { "tps6586x", 0 }, + { }, +}; +MODULE_DEVICE_TABLE(i2c, tps6586x_id_table); + +static struct i2c_driver tps6586x_driver = { + .driver = { + .name = "tps6586x", + .owner = THIS_MODULE, + }, + .probe = tps6586x_i2c_probe, + .remove = __devexit_p(tps6586x_i2c_remove), + .id_table = tps6586x_id_table, +}; + +static int __init tps6586x_init(void) +{ + return i2c_add_driver(&tps6586x_driver); +} +subsys_initcall(tps6586x_init); + +static void __exit tps6586x_exit(void) +{ + i2c_del_driver(&tps6586x_driver); +} +module_exit(tps6586x_exit); + +MODULE_DESCRIPTION("TPS6586X core driver"); +MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>"); +MODULE_LICENSE("GPL"); + diff --git a/include/linux/mfd/tps6586x.h b/include/linux/mfd/tps6586x.h new file mode 100644 index 000000000000..772b3ae640af --- /dev/null +++ b/include/linux/mfd/tps6586x.h @@ -0,0 +1,47 @@ +#ifndef __LINUX_MFD_TPS6586X_H +#define __LINUX_MFD_TPS6586X_H + +enum { + TPS6586X_ID_SM_0, + TPS6586X_ID_SM_1, + TPS6586X_ID_SM_2, + TPS6586X_ID_LDO_0, + TPS6586X_ID_LDO_1, + TPS6586X_ID_LDO_2, + TPS6586X_ID_LDO_3, + TPS6586X_ID_LDO_4, + TPS6586X_ID_LDO_5, + TPS6586X_ID_LDO_6, + TPS6586X_ID_LDO_7, + TPS6586X_ID_LDO_8, + TPS6586X_ID_LDO_9, + TPS6586X_ID_LDO_RTC, +}; + +struct tps6586x_subdev_info { + int id; + const char *name; + void *platform_data; +}; + +struct tps6586x_platform_data { + int num_subdevs; + struct tps6586x_subdev_info *subdevs; + + int gpio_base; +}; + +/* + * NOTE: the functions below are not intended for use outside + * of the TPS6586X sub-device drivers + */ +extern int tps6586x_write(struct device *dev, int reg, uint8_t val); +extern int tps6586x_writes(struct device *dev, int reg, int len, uint8_t *val); +extern int tps6586x_read(struct device *dev, int reg, uint8_t *val); +extern int tps6586x_reads(struct device *dev, int reg, int len, uint8_t *val); +extern int tps6586x_set_bits(struct device *dev, int reg, uint8_t bit_mask); +extern int tps6586x_clr_bits(struct device *dev, int reg, uint8_t bit_mask); +extern int tps6586x_update(struct device *dev, int reg, uint8_t val, + uint8_t mask); + +#endif /*__LINUX_MFD_TPS6586X_H */ |