drivers/mfd/tps6586x.c - maze/linux - Git at Google

 /*
  * 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, &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, &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, &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");
	/*
	* 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, &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, &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, &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");