drivers/mfd/tps65217.c - kernel/common.git - Git at Google

 /*
  * tps65217.c
  *
  * TPS65217 chip family multi-function driver
  *
  * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
  *
  * 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 version 2.
  *
  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
  * kind, whether express or implied; without even the implied warranty
  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  */

 #include <linux/kernel.h>
 #include <linux/device.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/init.h>
 #include <linux/i2c.h>
 #include <linux/slab.h>
 #include <linux/regmap.h>
 #include <linux/err.h>
 #include <linux/of.h>
 #include <linux/of_device.h>

 #include <linux/mfd/core.h>
 #include <linux/mfd/tps65217.h>

 static const struct mfd_cell tps65217s[] = {
 	{
 		.name = "tps65217-pmic",
 		.of_compatible = "ti,tps65217-pmic",
 	},
 	{
 		.name = "tps65217-bl",
 		.of_compatible = "ti,tps65217-bl",
 	},
 	{
 		.name = "tps65217-charger",
 		.of_compatible = "ti,tps65217-charger",
 	},
 };

 /**
  * tps65217_reg_read: Read a single tps65217 register.
  *
  * @tps: Device to read from.
  * @reg: Register to read.
  * @val: Contians the value
  */
 int tps65217_reg_read(struct tps65217 *tps, unsigned int reg,
 			unsigned int *val)
 {
 	return regmap_read(tps->regmap, reg, val);
 }
 EXPORT_SYMBOL_GPL(tps65217_reg_read);

 /**
  * tps65217_reg_write: Write a single tps65217 register.
  *
  * @tps65217: Device to write to.
  * @reg: Register to write to.
  * @val: Value to write.
  * @level: Password protected level
  */
 int tps65217_reg_write(struct tps65217 *tps, unsigned int reg,
 			unsigned int val, unsigned int level)
 {
 	int ret;
 	unsigned int xor_reg_val;

 	switch (level) {
 	case TPS65217_PROTECT_NONE:
 		return regmap_write(tps->regmap, reg, val);
 	case TPS65217_PROTECT_L1:
 		xor_reg_val = reg ^ TPS65217_PASSWORD_REGS_UNLOCK;
 		ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
 							xor_reg_val);
 		if (ret < 0)
 			return ret;

 		return regmap_write(tps->regmap, reg, val);
 	case TPS65217_PROTECT_L2:
 		xor_reg_val = reg ^ TPS65217_PASSWORD_REGS_UNLOCK;
 		ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
 							xor_reg_val);
 		if (ret < 0)
 			return ret;
 		ret = regmap_write(tps->regmap, reg, val);
 		if (ret < 0)
 			return ret;
 		ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
 							xor_reg_val);
 		if (ret < 0)
 			return ret;
 		return regmap_write(tps->regmap, reg, val);
 	default:
 		return -EINVAL;
 	}
 }
 EXPORT_SYMBOL_GPL(tps65217_reg_write);

 /**
  * tps65217_update_bits: Modify bits w.r.t mask, val and level.
  *
  * @tps65217: Device to write to.
  * @reg: Register to read-write to.
  * @mask: Mask.
  * @val: Value to write.
  * @level: Password protected level
  */
 static int tps65217_update_bits(struct tps65217 *tps, unsigned int reg,
 		unsigned int mask, unsigned int val, unsigned int level)
 {
 	int ret;
 	unsigned int data;

 	ret = tps65217_reg_read(tps, reg, &data);
 	if (ret) {
 		dev_err(tps->dev, "Read from reg 0x%x failed\n", reg);
 		return ret;
 	}

 	data &= ~mask;
 	data |= val & mask;

 	ret = tps65217_reg_write(tps, reg, data, level);
 	if (ret)
 		dev_err(tps->dev, "Write for reg 0x%x failed\n", reg);

 	return ret;
 }

 int tps65217_set_bits(struct tps65217 *tps, unsigned int reg,
 		unsigned int mask, unsigned int val, unsigned int level)
 {
 	return tps65217_update_bits(tps, reg, mask, val, level);
 }
 EXPORT_SYMBOL_GPL(tps65217_set_bits);

 int tps65217_clear_bits(struct tps65217 *tps, unsigned int reg,
 		unsigned int mask, unsigned int level)
 {
 	return tps65217_update_bits(tps, reg, mask, 0, level);
 }
 EXPORT_SYMBOL_GPL(tps65217_clear_bits);

 static const struct regmap_config tps65217_regmap_config = {
 	.reg_bits = 8,
 	.val_bits = 8,

 	.max_register = TPS65217_REG_MAX,
 };

 static const struct of_device_id tps65217_of_match[] = {
 	{ .compatible = "ti,tps65217", .data = (void *)TPS65217 },
 	{ /* sentinel */ },
 };
 MODULE_DEVICE_TABLE(of, tps65217_of_match);

 static int tps65217_probe(struct i2c_client *client,
 				const struct i2c_device_id *ids)
 {
 	struct tps65217 *tps;
 	unsigned int version;
 	unsigned long chip_id = ids->driver_data;
 	const struct of_device_id *match;
 	bool status_off = false;
 	int ret;

 	if (client->dev.of_node) {
 		match = of_match_device(tps65217_of_match, &client->dev);
 		if (!match) {
 			dev_err(&client->dev,
 				"Failed to find matching dt id\n");
 			return -EINVAL;
 		}
 		chip_id = (unsigned long)match->data;
 		status_off = of_property_read_bool(client->dev.of_node,
 					"ti,pmic-shutdown-controller");
 	}

 	if (!chip_id) {
 		dev_err(&client->dev, "id is null.\n");
 		return -ENODEV;
 	}

 	tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
 	if (!tps)
 		return -ENOMEM;

 	i2c_set_clientdata(client, tps);
 	tps->dev = &client->dev;
 	tps->id = chip_id;

 	tps->regmap = devm_regmap_init_i2c(client, &tps65217_regmap_config);
 	if (IS_ERR(tps->regmap)) {
 		ret = PTR_ERR(tps->regmap);
 		dev_err(tps->dev, "Failed to allocate register map: %d\n",
 			ret);
 		return ret;
 	}

 	ret = mfd_add_devices(tps->dev, -1, tps65217s,
 			      ARRAY_SIZE(tps65217s), NULL, 0, NULL);
 	if (ret < 0) {
 		dev_err(tps->dev, "mfd_add_devices failed: %d\n", ret);
 		return ret;
 	}

 	ret = tps65217_reg_read(tps, TPS65217_REG_CHIPID, &version);
 	if (ret < 0) {
 		dev_err(tps->dev, "Failed to read revision register: %d\n",
 			ret);
 		return ret;
 	}

 	/* Set the PMIC to shutdown on PWR_EN toggle */
 	if (status_off) {
 		ret = tps65217_set_bits(tps, TPS65217_REG_STATUS,
 				TPS65217_STATUS_OFF, TPS65217_STATUS_OFF,
 				TPS65217_PROTECT_NONE);
 		if (ret)
 			dev_warn(tps->dev, "unable to set the status OFF\n");
 	}

 	dev_info(tps->dev, "TPS65217 ID %#x version 1.%d\n",
 			(version & TPS65217_CHIPID_CHIP_MASK) >> 4,
 			version & TPS65217_CHIPID_REV_MASK);

 	return 0;
 }

 static int tps65217_remove(struct i2c_client *client)
 {
 	struct tps65217 *tps = i2c_get_clientdata(client);

 	mfd_remove_devices(tps->dev);

 	return 0;
 }

 static const struct i2c_device_id tps65217_id_table[] = {
 	{"tps65217", TPS65217},
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(i2c, tps65217_id_table);

 static struct i2c_driver tps65217_driver = {
 	.driver		= {
 		.name	= "tps65217",
 		.of_match_table = tps65217_of_match,
 	},
 	.id_table	= tps65217_id_table,
 	.probe		= tps65217_probe,
 	.remove		= tps65217_remove,
 };

 static int __init tps65217_init(void)
 {
 	return i2c_add_driver(&tps65217_driver);
 }
 subsys_initcall(tps65217_init);

 static void __exit tps65217_exit(void)
 {
 	i2c_del_driver(&tps65217_driver);
 }
 module_exit(tps65217_exit);

 MODULE_AUTHOR("AnilKumar Ch <anilkumar@ti.com>");
 MODULE_DESCRIPTION("TPS65217 chip family multi-function driver");
 MODULE_LICENSE("GPL v2");
	/*
	* tps65217.c
	*
	* TPS65217 chip family multi-function driver
	*
	* Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
	*
	* 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 version 2.
	*
	* This program is distributed "as is" WITHOUT ANY WARRANTY of any
	* kind, whether express or implied; without even the implied warranty
	* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*/

	#include <linux/kernel.h>
	#include <linux/device.h>
	#include <linux/module.h>
	#include <linux/platform_device.h>
	#include <linux/init.h>
	#include <linux/i2c.h>
	#include <linux/slab.h>
	#include <linux/regmap.h>
	#include <linux/err.h>
	#include <linux/of.h>
	#include <linux/of_device.h>

	#include <linux/mfd/core.h>
	#include <linux/mfd/tps65217.h>

	static const struct mfd_cell tps65217s[] = {
	{
	.name = "tps65217-pmic",
	.of_compatible = "ti,tps65217-pmic",
	},
	{
	.name = "tps65217-bl",
	.of_compatible = "ti,tps65217-bl",
	},
	{
	.name = "tps65217-charger",
	.of_compatible = "ti,tps65217-charger",
	},
	};

	/**
	* tps65217_reg_read: Read a single tps65217 register.
	*
	* @tps: Device to read from.
	* @reg: Register to read.
	* @val: Contians the value
	*/
	int tps65217_reg_read(struct tps65217 *tps, unsigned int reg,
	unsigned int *val)
	{
	return regmap_read(tps->regmap, reg, val);
	}
	EXPORT_SYMBOL_GPL(tps65217_reg_read);

	/**
	* tps65217_reg_write: Write a single tps65217 register.
	*
	* @tps65217: Device to write to.
	* @reg: Register to write to.
	* @val: Value to write.
	* @level: Password protected level
	*/
	int tps65217_reg_write(struct tps65217 *tps, unsigned int reg,
	unsigned int val, unsigned int level)
	{
	int ret;
	unsigned int xor_reg_val;

	switch (level) {
	case TPS65217_PROTECT_NONE:
	return regmap_write(tps->regmap, reg, val);
	case TPS65217_PROTECT_L1:
	xor_reg_val = reg ^ TPS65217_PASSWORD_REGS_UNLOCK;
	ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
	xor_reg_val);
	if (ret < 0)
	return ret;

	return regmap_write(tps->regmap, reg, val);
	case TPS65217_PROTECT_L2:
	xor_reg_val = reg ^ TPS65217_PASSWORD_REGS_UNLOCK;
	ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
	xor_reg_val);
	if (ret < 0)
	return ret;
	ret = regmap_write(tps->regmap, reg, val);
	if (ret < 0)
	return ret;
	ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
	xor_reg_val);
	if (ret < 0)
	return ret;
	return regmap_write(tps->regmap, reg, val);
	default:
	return -EINVAL;
	}
	}
	EXPORT_SYMBOL_GPL(tps65217_reg_write);

	/**
	* tps65217_update_bits: Modify bits w.r.t mask, val and level.
	*
	* @tps65217: Device to write to.
	* @reg: Register to read-write to.
	* @mask: Mask.
	* @val: Value to write.
	* @level: Password protected level
	*/
	static int tps65217_update_bits(struct tps65217 *tps, unsigned int reg,
	unsigned int mask, unsigned int val, unsigned int level)
	{
	int ret;
	unsigned int data;

	ret = tps65217_reg_read(tps, reg, &data);
	if (ret) {
	dev_err(tps->dev, "Read from reg 0x%x failed\n", reg);
	return ret;
	}

	data &= ~mask;
	data \|= val & mask;

	ret = tps65217_reg_write(tps, reg, data, level);
	if (ret)
	dev_err(tps->dev, "Write for reg 0x%x failed\n", reg);

	return ret;
	}

	int tps65217_set_bits(struct tps65217 *tps, unsigned int reg,
	unsigned int mask, unsigned int val, unsigned int level)
	{
	return tps65217_update_bits(tps, reg, mask, val, level);
	}
	EXPORT_SYMBOL_GPL(tps65217_set_bits);

	int tps65217_clear_bits(struct tps65217 *tps, unsigned int reg,
	unsigned int mask, unsigned int level)
	{
	return tps65217_update_bits(tps, reg, mask, 0, level);
	}
	EXPORT_SYMBOL_GPL(tps65217_clear_bits);

	static const struct regmap_config tps65217_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,

	.max_register = TPS65217_REG_MAX,
	};

	static const struct of_device_id tps65217_of_match[] = {
	{ .compatible = "ti,tps65217", .data = (void *)TPS65217 },
	{ /* sentinel */ },
	};
	MODULE_DEVICE_TABLE(of, tps65217_of_match);

	static int tps65217_probe(struct i2c_client *client,
	const struct i2c_device_id *ids)
	{
	struct tps65217 *tps;
	unsigned int version;
	unsigned long chip_id = ids->driver_data;
	const struct of_device_id *match;
	bool status_off = false;
	int ret;

	if (client->dev.of_node) {
	match = of_match_device(tps65217_of_match, &client->dev);
	if (!match) {
	dev_err(&client->dev,
	"Failed to find matching dt id\n");
	return -EINVAL;
	}
	chip_id = (unsigned long)match->data;
	status_off = of_property_read_bool(client->dev.of_node,
	"ti,pmic-shutdown-controller");
	}

	if (!chip_id) {
	dev_err(&client->dev, "id is null.\n");
	return -ENODEV;
	}

	tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
	if (!tps)
	return -ENOMEM;

	i2c_set_clientdata(client, tps);
	tps->dev = &client->dev;
	tps->id = chip_id;

	tps->regmap = devm_regmap_init_i2c(client, &tps65217_regmap_config);
	if (IS_ERR(tps->regmap)) {
	ret = PTR_ERR(tps->regmap);
	dev_err(tps->dev, "Failed to allocate register map: %d\n",
	ret);
	return ret;
	}

	ret = mfd_add_devices(tps->dev, -1, tps65217s,
	ARRAY_SIZE(tps65217s), NULL, 0, NULL);
	if (ret < 0) {
	dev_err(tps->dev, "mfd_add_devices failed: %d\n", ret);
	return ret;
	}

	ret = tps65217_reg_read(tps, TPS65217_REG_CHIPID, &version);
	if (ret < 0) {
	dev_err(tps->dev, "Failed to read revision register: %d\n",
	ret);
	return ret;
	}

	/* Set the PMIC to shutdown on PWR_EN toggle */
	if (status_off) {
	ret = tps65217_set_bits(tps, TPS65217_REG_STATUS,
	TPS65217_STATUS_OFF, TPS65217_STATUS_OFF,
	TPS65217_PROTECT_NONE);
	if (ret)
	dev_warn(tps->dev, "unable to set the status OFF\n");
	}

	dev_info(tps->dev, "TPS65217 ID %#x version 1.%d\n",
	(version & TPS65217_CHIPID_CHIP_MASK) >> 4,
	version & TPS65217_CHIPID_REV_MASK);

	return 0;
	}

	static int tps65217_remove(struct i2c_client *client)
	{
	struct tps65217 *tps = i2c_get_clientdata(client);

	mfd_remove_devices(tps->dev);

	return 0;
	}

	static const struct i2c_device_id tps65217_id_table[] = {
	{"tps65217", TPS65217},
	{ /* sentinel */ }
	};
	MODULE_DEVICE_TABLE(i2c, tps65217_id_table);

	static struct i2c_driver tps65217_driver = {
	.driver = {
	.name = "tps65217",
	.of_match_table = tps65217_of_match,
	},
	.id_table = tps65217_id_table,
	.probe = tps65217_probe,
	.remove = tps65217_remove,
	};

	static int __init tps65217_init(void)
	{
	return i2c_add_driver(&tps65217_driver);
	}
	subsys_initcall(tps65217_init);

	static void __exit tps65217_exit(void)
	{
	i2c_del_driver(&tps65217_driver);
	}
	module_exit(tps65217_exit);

	MODULE_AUTHOR("AnilKumar Ch <anilkumar@ti.com>");
	MODULE_DESCRIPTION("TPS65217 chip family multi-function driver");
	MODULE_LICENSE("GPL v2");