drivers/power/supply/bq27xxx_battery_i2c.c - linux - Git at Google

 /*
  * BQ27xxx battery monitor I2C driver
  *
  * Copyright (C) 2015 Texas Instruments Incorporated - https://www.ti.com/
  *	Andrew F. Davis <afd@ti.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.
  *
  * 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/i2c.h>
 #include <linux/interrupt.h>
 #include <linux/module.h>
 #include <asm/unaligned.h>

 #include <linux/power/bq27xxx_battery.h>

 static DEFINE_IDR(battery_id);
 static DEFINE_MUTEX(battery_mutex);

 static irqreturn_t bq27xxx_battery_irq_handler_thread(int irq, void *data)
 {
 	struct bq27xxx_device_info *di = data;

 	bq27xxx_battery_update(di);

 	return IRQ_HANDLED;
 }

 static int bq27xxx_battery_i2c_read(struct bq27xxx_device_info *di, u8 reg,
 				    bool single)
 {
 	struct i2c_client *client = to_i2c_client(di->dev);
 	struct i2c_msg msg[2];
 	u8 data[2];
 	int ret;

 	if (!client->adapter)
 		return -ENODEV;

 	msg[0].addr = client->addr;
 	msg[0].flags = 0;
 	msg[0].buf = &reg;
 	msg[0].len = sizeof(reg);
 	msg[1].addr = client->addr;
 	msg[1].flags = I2C_M_RD;
 	msg[1].buf = data;
 	if (single)
 		msg[1].len = 1;
 	else
 		msg[1].len = 2;

 	ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
 	if (ret < 0)
 		return ret;

 	if (!single)
 		ret = get_unaligned_le16(data);
 	else
 		ret = data[0];

 	return ret;
 }

 static int bq27xxx_battery_i2c_write(struct bq27xxx_device_info *di, u8 reg,
 				     int value, bool single)
 {
 	struct i2c_client *client = to_i2c_client(di->dev);
 	struct i2c_msg msg;
 	u8 data[4];
 	int ret;

 	if (!client->adapter)
 		return -ENODEV;

 	data[0] = reg;
 	if (single) {
 		data[1] = (u8) value;
 		msg.len = 2;
 	} else {
 		put_unaligned_le16(value, &data[1]);
 		msg.len = 3;
 	}

 	msg.buf = data;
 	msg.addr = client->addr;
 	msg.flags = 0;

 	ret = i2c_transfer(client->adapter, &msg, 1);
 	if (ret < 0)
 		return ret;
 	if (ret != 1)
 		return -EINVAL;
 	return 0;
 }

 static int bq27xxx_battery_i2c_bulk_read(struct bq27xxx_device_info *di, u8 reg,
 					 u8 *data, int len)
 {
 	struct i2c_client *client = to_i2c_client(di->dev);
 	int ret;

 	if (!client->adapter)
 		return -ENODEV;

 	ret = i2c_smbus_read_i2c_block_data(client, reg, len, data);
 	if (ret < 0)
 		return ret;
 	if (ret != len)
 		return -EINVAL;
 	return 0;
 }

 static int bq27xxx_battery_i2c_bulk_write(struct bq27xxx_device_info *di,
 					  u8 reg, u8 *data, int len)
 {
 	struct i2c_client *client = to_i2c_client(di->dev);
 	struct i2c_msg msg;
 	u8 buf[33];
 	int ret;

 	if (!client->adapter)
 		return -ENODEV;

 	buf[0] = reg;
 	memcpy(&buf[1], data, len);

 	msg.buf = buf;
 	msg.addr = client->addr;
 	msg.flags = 0;
 	msg.len = len + 1;

 	ret = i2c_transfer(client->adapter, &msg, 1);
 	if (ret < 0)
 		return ret;
 	if (ret != 1)
 		return -EINVAL;
 	return 0;
 }

 static int bq27xxx_battery_i2c_probe(struct i2c_client *client,
 				     const struct i2c_device_id *id)
 {
 	struct bq27xxx_device_info *di;
 	int ret;
 	char *name;
 	int num;

 	/* Get new ID for the new battery device */
 	mutex_lock(&battery_mutex);
 	num = idr_alloc(&battery_id, client, 0, 0, GFP_KERNEL);
 	mutex_unlock(&battery_mutex);
 	if (num < 0)
 		return num;

 	name = devm_kasprintf(&client->dev, GFP_KERNEL, "%s-%d", id->name, num);
 	if (!name)
 		goto err_mem;

 	di = devm_kzalloc(&client->dev, sizeof(*di), GFP_KERNEL);
 	if (!di)
 		goto err_mem;

 	di->id = num;
 	di->dev = &client->dev;
 	di->chip = id->driver_data;
 	di->name = name;

 	di->bus.read = bq27xxx_battery_i2c_read;
 	di->bus.write = bq27xxx_battery_i2c_write;
 	di->bus.read_bulk = bq27xxx_battery_i2c_bulk_read;
 	di->bus.write_bulk = bq27xxx_battery_i2c_bulk_write;

 	ret = bq27xxx_battery_setup(di);
 	if (ret)
 		goto err_failed;

 	/* Schedule a polling after about 1 min */
 	schedule_delayed_work(&di->work, 60 * HZ);

 	i2c_set_clientdata(client, di);

 	if (client->irq) {
 		ret = devm_request_threaded_irq(&client->dev, client->irq,
 				NULL, bq27xxx_battery_irq_handler_thread,
 				IRQF_ONESHOT,
 				di->name, di);
 		if (ret) {
 			dev_err(&client->dev,
 				"Unable to register IRQ %d error %d\n",
 				client->irq, ret);
 			return ret;
 		}
 	}

 	return 0;

 err_mem:
 	ret = -ENOMEM;

 err_failed:
 	mutex_lock(&battery_mutex);
 	idr_remove(&battery_id, num);
 	mutex_unlock(&battery_mutex);

 	return ret;
 }

 static int bq27xxx_battery_i2c_remove(struct i2c_client *client)
 {
 	struct bq27xxx_device_info *di = i2c_get_clientdata(client);

 	bq27xxx_battery_teardown(di);

 	mutex_lock(&battery_mutex);
 	idr_remove(&battery_id, di->id);
 	mutex_unlock(&battery_mutex);

 	return 0;
 }

 static const struct i2c_device_id bq27xxx_i2c_id_table[] = {
 	{ "bq27200", BQ27000 },
 	{ "bq27210", BQ27010 },
 	{ "bq27500", BQ2750X },
 	{ "bq27510", BQ2751X },
 	{ "bq27520", BQ2752X },
 	{ "bq27500-1", BQ27500 },
 	{ "bq27510g1", BQ27510G1 },
 	{ "bq27510g2", BQ27510G2 },
 	{ "bq27510g3", BQ27510G3 },
 	{ "bq27520g1", BQ27520G1 },
 	{ "bq27520g2", BQ27520G2 },
 	{ "bq27520g3", BQ27520G3 },
 	{ "bq27520g4", BQ27520G4 },
 	{ "bq27521", BQ27521 },
 	{ "bq27530", BQ27530 },
 	{ "bq27531", BQ27531 },
 	{ "bq27541", BQ27541 },
 	{ "bq27542", BQ27542 },
 	{ "bq27546", BQ27546 },
 	{ "bq27742", BQ27742 },
 	{ "bq27545", BQ27545 },
 	{ "bq27411", BQ27411 },
 	{ "bq27421", BQ27421 },
 	{ "bq27425", BQ27425 },
 	{ "bq27426", BQ27426 },
 	{ "bq27441", BQ27441 },
 	{ "bq27621", BQ27621 },
 	{ "bq27z561", BQ27Z561 },
 	{ "bq28z610", BQ28Z610 },
 	{},
 };
 MODULE_DEVICE_TABLE(i2c, bq27xxx_i2c_id_table);

 #ifdef CONFIG_OF
 static const struct of_device_id bq27xxx_battery_i2c_of_match_table[] = {
 	{ .compatible = "ti,bq27200" },
 	{ .compatible = "ti,bq27210" },
 	{ .compatible = "ti,bq27500" },
 	{ .compatible = "ti,bq27510" },
 	{ .compatible = "ti,bq27520" },
 	{ .compatible = "ti,bq27500-1" },
 	{ .compatible = "ti,bq27510g1" },
 	{ .compatible = "ti,bq27510g2" },
 	{ .compatible = "ti,bq27510g3" },
 	{ .compatible = "ti,bq27520g1" },
 	{ .compatible = "ti,bq27520g2" },
 	{ .compatible = "ti,bq27520g3" },
 	{ .compatible = "ti,bq27520g4" },
 	{ .compatible = "ti,bq27521" },
 	{ .compatible = "ti,bq27530" },
 	{ .compatible = "ti,bq27531" },
 	{ .compatible = "ti,bq27541" },
 	{ .compatible = "ti,bq27542" },
 	{ .compatible = "ti,bq27546" },
 	{ .compatible = "ti,bq27742" },
 	{ .compatible = "ti,bq27545" },
 	{ .compatible = "ti,bq27411" },
 	{ .compatible = "ti,bq27421" },
 	{ .compatible = "ti,bq27425" },
 	{ .compatible = "ti,bq27426" },
 	{ .compatible = "ti,bq27441" },
 	{ .compatible = "ti,bq27621" },
 	{ .compatible = "ti,bq27z561" },
 	{ .compatible = "ti,bq28z610" },
 	{},
 };
 MODULE_DEVICE_TABLE(of, bq27xxx_battery_i2c_of_match_table);
 #endif

 static struct i2c_driver bq27xxx_battery_i2c_driver = {
 	.driver = {
 		.name = "bq27xxx-battery",
 		.of_match_table = of_match_ptr(bq27xxx_battery_i2c_of_match_table),
 	},
 	.probe = bq27xxx_battery_i2c_probe,
 	.remove = bq27xxx_battery_i2c_remove,
 	.id_table = bq27xxx_i2c_id_table,
 };
 module_i2c_driver(bq27xxx_battery_i2c_driver);

 MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
 MODULE_DESCRIPTION("BQ27xxx battery monitor i2c driver");
 MODULE_LICENSE("GPL");
	/*
	* BQ27xxx battery monitor I2C driver
	*
	* Copyright (C) 2015 Texas Instruments Incorporated - https://www.ti.com/
	* Andrew F. Davis <afd@ti.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.
	*
	* 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/i2c.h>
	#include <linux/interrupt.h>
	#include <linux/module.h>
	#include <asm/unaligned.h>

	#include <linux/power/bq27xxx_battery.h>

	static DEFINE_IDR(battery_id);
	static DEFINE_MUTEX(battery_mutex);

	static irqreturn_t bq27xxx_battery_irq_handler_thread(int irq, void *data)
	{
	struct bq27xxx_device_info *di = data;

	bq27xxx_battery_update(di);

	return IRQ_HANDLED;
	}

	static int bq27xxx_battery_i2c_read(struct bq27xxx_device_info *di, u8 reg,
	bool single)
	{
	struct i2c_client *client = to_i2c_client(di->dev);
	struct i2c_msg msg[2];
	u8 data[2];
	int ret;

	if (!client->adapter)
	return -ENODEV;

	msg[0].addr = client->addr;
	msg[0].flags = 0;
	msg[0].buf = ®
	msg[0].len = sizeof(reg);
	msg[1].addr = client->addr;
	msg[1].flags = I2C_M_RD;
	msg[1].buf = data;
	if (single)
	msg[1].len = 1;
	else
	msg[1].len = 2;

	ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
	if (ret < 0)
	return ret;

	if (!single)
	ret = get_unaligned_le16(data);
	else
	ret = data[0];

	return ret;
	}

	static int bq27xxx_battery_i2c_write(struct bq27xxx_device_info *di, u8 reg,
	int value, bool single)
	{
	struct i2c_client *client = to_i2c_client(di->dev);
	struct i2c_msg msg;
	u8 data[4];
	int ret;

	if (!client->adapter)
	return -ENODEV;

	data[0] = reg;
	if (single) {
	data[1] = (u8) value;
	msg.len = 2;
	} else {
	put_unaligned_le16(value, &data[1]);
	msg.len = 3;
	}

	msg.buf = data;
	msg.addr = client->addr;
	msg.flags = 0;

	ret = i2c_transfer(client->adapter, &msg, 1);
	if (ret < 0)
	return ret;
	if (ret != 1)
	return -EINVAL;
	return 0;
	}

	static int bq27xxx_battery_i2c_bulk_read(struct bq27xxx_device_info *di, u8 reg,
	u8 *data, int len)
	{
	struct i2c_client *client = to_i2c_client(di->dev);
	int ret;

	if (!client->adapter)
	return -ENODEV;

	ret = i2c_smbus_read_i2c_block_data(client, reg, len, data);
	if (ret < 0)
	return ret;
	if (ret != len)
	return -EINVAL;
	return 0;
	}

	static int bq27xxx_battery_i2c_bulk_write(struct bq27xxx_device_info *di,
	u8 reg, u8 *data, int len)
	{
	struct i2c_client *client = to_i2c_client(di->dev);
	struct i2c_msg msg;
	u8 buf[33];
	int ret;

	if (!client->adapter)
	return -ENODEV;

	buf[0] = reg;
	memcpy(&buf[1], data, len);

	msg.buf = buf;
	msg.addr = client->addr;
	msg.flags = 0;
	msg.len = len + 1;

	ret = i2c_transfer(client->adapter, &msg, 1);
	if (ret < 0)
	return ret;
	if (ret != 1)
	return -EINVAL;
	return 0;
	}

	static int bq27xxx_battery_i2c_probe(struct i2c_client *client,
	const struct i2c_device_id *id)
	{
	struct bq27xxx_device_info *di;
	int ret;
	char *name;
	int num;

	/* Get new ID for the new battery device */
	mutex_lock(&battery_mutex);
	num = idr_alloc(&battery_id, client, 0, 0, GFP_KERNEL);
	mutex_unlock(&battery_mutex);
	if (num < 0)
	return num;

	name = devm_kasprintf(&client->dev, GFP_KERNEL, "%s-%d", id->name, num);
	if (!name)
	goto err_mem;

	di = devm_kzalloc(&client->dev, sizeof(*di), GFP_KERNEL);
	if (!di)
	goto err_mem;

	di->id = num;
	di->dev = &client->dev;
	di->chip = id->driver_data;
	di->name = name;

	di->bus.read = bq27xxx_battery_i2c_read;
	di->bus.write = bq27xxx_battery_i2c_write;
	di->bus.read_bulk = bq27xxx_battery_i2c_bulk_read;
	di->bus.write_bulk = bq27xxx_battery_i2c_bulk_write;

	ret = bq27xxx_battery_setup(di);
	if (ret)
	goto err_failed;

	/* Schedule a polling after about 1 min */
	schedule_delayed_work(&di->work, 60 * HZ);

	i2c_set_clientdata(client, di);

	if (client->irq) {
	ret = devm_request_threaded_irq(&client->dev, client->irq,
	NULL, bq27xxx_battery_irq_handler_thread,
	IRQF_ONESHOT,
	di->name, di);
	if (ret) {
	dev_err(&client->dev,
	"Unable to register IRQ %d error %d\n",
	client->irq, ret);
	return ret;
	}
	}

	return 0;

	err_mem:
	ret = -ENOMEM;

	err_failed:
	mutex_lock(&battery_mutex);
	idr_remove(&battery_id, num);
	mutex_unlock(&battery_mutex);

	return ret;
	}

	static int bq27xxx_battery_i2c_remove(struct i2c_client *client)
	{
	struct bq27xxx_device_info *di = i2c_get_clientdata(client);

	bq27xxx_battery_teardown(di);

	mutex_lock(&battery_mutex);
	idr_remove(&battery_id, di->id);
	mutex_unlock(&battery_mutex);

	return 0;
	}

	static const struct i2c_device_id bq27xxx_i2c_id_table[] = {
	{ "bq27200", BQ27000 },
	{ "bq27210", BQ27010 },
	{ "bq27500", BQ2750X },
	{ "bq27510", BQ2751X },
	{ "bq27520", BQ2752X },
	{ "bq27500-1", BQ27500 },
	{ "bq27510g1", BQ27510G1 },
	{ "bq27510g2", BQ27510G2 },
	{ "bq27510g3", BQ27510G3 },
	{ "bq27520g1", BQ27520G1 },
	{ "bq27520g2", BQ27520G2 },
	{ "bq27520g3", BQ27520G3 },
	{ "bq27520g4", BQ27520G4 },
	{ "bq27521", BQ27521 },
	{ "bq27530", BQ27530 },
	{ "bq27531", BQ27531 },
	{ "bq27541", BQ27541 },
	{ "bq27542", BQ27542 },
	{ "bq27546", BQ27546 },
	{ "bq27742", BQ27742 },
	{ "bq27545", BQ27545 },
	{ "bq27411", BQ27411 },
	{ "bq27421", BQ27421 },
	{ "bq27425", BQ27425 },
	{ "bq27426", BQ27426 },
	{ "bq27441", BQ27441 },
	{ "bq27621", BQ27621 },
	{ "bq27z561", BQ27Z561 },
	{ "bq28z610", BQ28Z610 },
	{},
	};
	MODULE_DEVICE_TABLE(i2c, bq27xxx_i2c_id_table);

	#ifdef CONFIG_OF
	static const struct of_device_id bq27xxx_battery_i2c_of_match_table[] = {
	{ .compatible = "ti,bq27200" },
	{ .compatible = "ti,bq27210" },
	{ .compatible = "ti,bq27500" },
	{ .compatible = "ti,bq27510" },
	{ .compatible = "ti,bq27520" },
	{ .compatible = "ti,bq27500-1" },
	{ .compatible = "ti,bq27510g1" },
	{ .compatible = "ti,bq27510g2" },
	{ .compatible = "ti,bq27510g3" },
	{ .compatible = "ti,bq27520g1" },
	{ .compatible = "ti,bq27520g2" },
	{ .compatible = "ti,bq27520g3" },
	{ .compatible = "ti,bq27520g4" },
	{ .compatible = "ti,bq27521" },
	{ .compatible = "ti,bq27530" },
	{ .compatible = "ti,bq27531" },
	{ .compatible = "ti,bq27541" },
	{ .compatible = "ti,bq27542" },
	{ .compatible = "ti,bq27546" },
	{ .compatible = "ti,bq27742" },
	{ .compatible = "ti,bq27545" },
	{ .compatible = "ti,bq27411" },
	{ .compatible = "ti,bq27421" },
	{ .compatible = "ti,bq27425" },
	{ .compatible = "ti,bq27426" },
	{ .compatible = "ti,bq27441" },
	{ .compatible = "ti,bq27621" },
	{ .compatible = "ti,bq27z561" },
	{ .compatible = "ti,bq28z610" },
	{},
	};
	MODULE_DEVICE_TABLE(of, bq27xxx_battery_i2c_of_match_table);
	#endif

	static struct i2c_driver bq27xxx_battery_i2c_driver = {
	.driver = {
	.name = "bq27xxx-battery",
	.of_match_table = of_match_ptr(bq27xxx_battery_i2c_of_match_table),
	},
	.probe = bq27xxx_battery_i2c_probe,
	.remove = bq27xxx_battery_i2c_remove,
	.id_table = bq27xxx_i2c_id_table,
	};
	module_i2c_driver(bq27xxx_battery_i2c_driver);

	MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
	MODULE_DESCRIPTION("BQ27xxx battery monitor i2c driver");
	MODULE_LICENSE("GPL");