drivers/hwmon/pmbus/zl6100.c - kernel/windcharger - Git at Google

 /*
  * Hardware monitoring driver for ZL6100 and compatibles
  *
  * Copyright (c) 2011 Ericsson AB.
  *
  * 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; either version 2 of the License, or
  * (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */

 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/err.h>
 #include <linux/slab.h>
 #include <linux/i2c.h>
 #include <linux/ktime.h>
 #include <linux/delay.h>
 #include "pmbus.h"

 enum chips { zl2004, zl2005, zl2006, zl2008, zl2105, zl2106, zl6100, zl6105 };

 struct zl6100_data {
 	int id;
 	ktime_t access;		/* chip access time */
 	int delay;		/* Delay between chip accesses in uS */
 	struct pmbus_driver_info info;
 };

 #define to_zl6100_data(x)  container_of(x, struct zl6100_data, info)

 #define ZL6100_MFR_CONFIG		0xd0
 #define ZL6100_DEVICE_ID		0xe4

 #define ZL6100_MFR_XTEMP_ENABLE		(1 << 7)

 #define ZL6100_WAIT_TIME		1000	/* uS	*/

 static ushort delay = ZL6100_WAIT_TIME;
 module_param(delay, ushort, 0644);
 MODULE_PARM_DESC(delay, "Delay between chip accesses in uS");

 /* Some chips need a delay between accesses */
 static inline void zl6100_wait(const struct zl6100_data *data)
 {
 	if (data->delay) {
 		s64 delta = ktime_us_delta(ktime_get(), data->access);
 		if (delta < data->delay)
 			udelay(data->delay - delta);
 	}
 }

 static int zl6100_read_word_data(struct i2c_client *client, int page, int reg)
 {
 	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
 	struct zl6100_data *data = to_zl6100_data(info);
 	int ret;

 	if (page || reg >= PMBUS_VIRT_BASE)
 		return -ENXIO;

 	if (data->id == zl2005) {
 		/*
 		 * Limit register detection is not reliable on ZL2005.
 		 * Make sure registers are not erroneously detected.
 		 */
 		switch (reg) {
 		case PMBUS_VOUT_OV_WARN_LIMIT:
 		case PMBUS_VOUT_UV_WARN_LIMIT:
 		case PMBUS_IOUT_OC_WARN_LIMIT:
 			return -ENXIO;
 		}
 	}

 	zl6100_wait(data);
 	ret = pmbus_read_word_data(client, page, reg);
 	data->access = ktime_get();

 	return ret;
 }

 static int zl6100_read_byte_data(struct i2c_client *client, int page, int reg)
 {
 	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
 	struct zl6100_data *data = to_zl6100_data(info);
 	int ret;

 	if (page > 0)
 		return -ENXIO;

 	zl6100_wait(data);
 	ret = pmbus_read_byte_data(client, page, reg);
 	data->access = ktime_get();

 	return ret;
 }

 static int zl6100_write_word_data(struct i2c_client *client, int page, int reg,
 				  u16 word)
 {
 	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
 	struct zl6100_data *data = to_zl6100_data(info);
 	int ret;

 	if (page || reg >= PMBUS_VIRT_BASE)
 		return -ENXIO;

 	zl6100_wait(data);
 	ret = pmbus_write_word_data(client, page, reg, word);
 	data->access = ktime_get();

 	return ret;
 }

 static int zl6100_write_byte(struct i2c_client *client, int page, u8 value)
 {
 	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
 	struct zl6100_data *data = to_zl6100_data(info);
 	int ret;

 	if (page > 0)
 		return -ENXIO;

 	zl6100_wait(data);
 	ret = pmbus_write_byte(client, page, value);
 	data->access = ktime_get();

 	return ret;
 }

 static const struct i2c_device_id zl6100_id[] = {
 	{"bmr450", zl2005},
 	{"bmr451", zl2005},
 	{"bmr462", zl2008},
 	{"bmr463", zl2008},
 	{"bmr464", zl2008},
 	{"zl2004", zl2004},
 	{"zl2005", zl2005},
 	{"zl2006", zl2006},
 	{"zl2008", zl2008},
 	{"zl2105", zl2105},
 	{"zl2106", zl2106},
 	{"zl6100", zl6100},
 	{"zl6105", zl6105},
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, zl6100_id);

 static int zl6100_probe(struct i2c_client *client,
 			const struct i2c_device_id *id)
 {
 	int ret;
 	struct zl6100_data *data;
 	struct pmbus_driver_info *info;
 	u8 device_id[I2C_SMBUS_BLOCK_MAX + 1];
 	const struct i2c_device_id *mid;

 	if (!i2c_check_functionality(client->adapter,
 				     I2C_FUNC_SMBUS_READ_WORD_DATA
 				     | I2C_FUNC_SMBUS_READ_BLOCK_DATA))
 		return -ENODEV;

 	ret = i2c_smbus_read_block_data(client, ZL6100_DEVICE_ID,
 					device_id);
 	if (ret < 0) {
 		dev_err(&client->dev, "Failed to read device ID\n");
 		return ret;
 	}
 	device_id[ret] = '\0';
 	dev_info(&client->dev, "Device ID %s\n", device_id);

 	mid = NULL;
 	for (mid = zl6100_id; mid->name[0]; mid++) {
 		if (!strncasecmp(mid->name, device_id, strlen(mid->name)))
 			break;
 	}
 	if (!mid->name[0]) {
 		dev_err(&client->dev, "Unsupported device\n");
 		return -ENODEV;
 	}
 	if (id->driver_data != mid->driver_data)
 		dev_notice(&client->dev,
 			   "Device mismatch: Configured %s, detected %s\n",
 			   id->name, mid->name);

 	data = kzalloc(sizeof(struct zl6100_data), GFP_KERNEL);
 	if (!data)
 		return -ENOMEM;

 	data->id = mid->driver_data;

 	/*
 	 * According to information from the chip vendor, all currently
 	 * supported chips are known to require a wait time between I2C
 	 * accesses.
 	 */
 	data->delay = delay;

 	/*
 	 * Since there was a direct I2C device access above, wait before
 	 * accessing the chip again.
 	 */
 	data->access = ktime_get();
 	zl6100_wait(data);

 	info = &data->info;

 	info->pages = 1;
 	info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT
 	  | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
 	  | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
 	  | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;

 	ret = i2c_smbus_read_word_data(client, ZL6100_MFR_CONFIG);
 	if (ret < 0)
 		goto err_mem;
 	if (ret & ZL6100_MFR_XTEMP_ENABLE)
 		info->func[0] |= PMBUS_HAVE_TEMP2;

 	data->access = ktime_get();
 	zl6100_wait(data);

 	info->read_word_data = zl6100_read_word_data;
 	info->read_byte_data = zl6100_read_byte_data;
 	info->write_word_data = zl6100_write_word_data;
 	info->write_byte = zl6100_write_byte;

 	ret = pmbus_do_probe(client, mid, info);
 	if (ret)
 		goto err_mem;
 	return 0;

 err_mem:
 	kfree(data);
 	return ret;
 }

 static int zl6100_remove(struct i2c_client *client)
 {
 	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
 	const struct zl6100_data *data = to_zl6100_data(info);

 	pmbus_do_remove(client);
 	kfree(data);
 	return 0;
 }

 static struct i2c_driver zl6100_driver = {
 	.driver = {
 		   .name = "zl6100",
 		   },
 	.probe = zl6100_probe,
 	.remove = zl6100_remove,
 	.id_table = zl6100_id,
 };

 static int __init zl6100_init(void)
 {
 	return i2c_add_driver(&zl6100_driver);
 }

 static void __exit zl6100_exit(void)
 {
 	i2c_del_driver(&zl6100_driver);
 }

 MODULE_AUTHOR("Guenter Roeck");
 MODULE_DESCRIPTION("PMBus driver for ZL6100 and compatibles");
 MODULE_LICENSE("GPL");
 module_init(zl6100_init);
 module_exit(zl6100_exit);
	/*
	* Hardware monitoring driver for ZL6100 and compatibles
	*
	* Copyright (c) 2011 Ericsson AB.
	*
	* 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; either version 2 of the License, or
	* (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	*/

	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/err.h>
	#include <linux/slab.h>
	#include <linux/i2c.h>
	#include <linux/ktime.h>
	#include <linux/delay.h>
	#include "pmbus.h"

	enum chips { zl2004, zl2005, zl2006, zl2008, zl2105, zl2106, zl6100, zl6105 };

	struct zl6100_data {
	int id;
	ktime_t access; /* chip access time */
	int delay; /* Delay between chip accesses in uS */
	struct pmbus_driver_info info;
	};

	#define to_zl6100_data(x) container_of(x, struct zl6100_data, info)

	#define ZL6100_MFR_CONFIG 0xd0
	#define ZL6100_DEVICE_ID 0xe4

	#define ZL6100_MFR_XTEMP_ENABLE (1 << 7)

	#define ZL6100_WAIT_TIME 1000 /* uS */

	static ushort delay = ZL6100_WAIT_TIME;
	module_param(delay, ushort, 0644);
	MODULE_PARM_DESC(delay, "Delay between chip accesses in uS");

	/* Some chips need a delay between accesses */
	static inline void zl6100_wait(const struct zl6100_data *data)
	{
	if (data->delay) {
	s64 delta = ktime_us_delta(ktime_get(), data->access);
	if (delta < data->delay)
	udelay(data->delay - delta);
	}
	}

	static int zl6100_read_word_data(struct i2c_client *client, int page, int reg)
	{
	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
	struct zl6100_data *data = to_zl6100_data(info);
	int ret;

	if (page \|\| reg >= PMBUS_VIRT_BASE)
	return -ENXIO;

	if (data->id == zl2005) {
	/*
	* Limit register detection is not reliable on ZL2005.
	* Make sure registers are not erroneously detected.
	*/
	switch (reg) {
	case PMBUS_VOUT_OV_WARN_LIMIT:
	case PMBUS_VOUT_UV_WARN_LIMIT:
	case PMBUS_IOUT_OC_WARN_LIMIT:
	return -ENXIO;
	}
	}

	zl6100_wait(data);
	ret = pmbus_read_word_data(client, page, reg);
	data->access = ktime_get();

	return ret;
	}

	static int zl6100_read_byte_data(struct i2c_client *client, int page, int reg)
	{
	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
	struct zl6100_data *data = to_zl6100_data(info);
	int ret;

	if (page > 0)
	return -ENXIO;

	zl6100_wait(data);
	ret = pmbus_read_byte_data(client, page, reg);
	data->access = ktime_get();

	return ret;
	}

	static int zl6100_write_word_data(struct i2c_client *client, int page, int reg,
	u16 word)
	{
	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
	struct zl6100_data *data = to_zl6100_data(info);
	int ret;

	if (page \|\| reg >= PMBUS_VIRT_BASE)
	return -ENXIO;

	zl6100_wait(data);
	ret = pmbus_write_word_data(client, page, reg, word);
	data->access = ktime_get();

	return ret;
	}

	static int zl6100_write_byte(struct i2c_client *client, int page, u8 value)
	{
	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
	struct zl6100_data *data = to_zl6100_data(info);
	int ret;

	if (page > 0)
	return -ENXIO;

	zl6100_wait(data);
	ret = pmbus_write_byte(client, page, value);
	data->access = ktime_get();

	return ret;
	}

	static const struct i2c_device_id zl6100_id[] = {
	{"bmr450", zl2005},
	{"bmr451", zl2005},
	{"bmr462", zl2008},
	{"bmr463", zl2008},
	{"bmr464", zl2008},
	{"zl2004", zl2004},
	{"zl2005", zl2005},
	{"zl2006", zl2006},
	{"zl2008", zl2008},
	{"zl2105", zl2105},
	{"zl2106", zl2106},
	{"zl6100", zl6100},
	{"zl6105", zl6105},
	{ }
	};
	MODULE_DEVICE_TABLE(i2c, zl6100_id);

	static int zl6100_probe(struct i2c_client *client,
	const struct i2c_device_id *id)
	{
	int ret;
	struct zl6100_data *data;
	struct pmbus_driver_info *info;
	u8 device_id[I2C_SMBUS_BLOCK_MAX + 1];
	const struct i2c_device_id *mid;

	if (!i2c_check_functionality(client->adapter,
	I2C_FUNC_SMBUS_READ_WORD_DATA
	\| I2C_FUNC_SMBUS_READ_BLOCK_DATA))
	return -ENODEV;

	ret = i2c_smbus_read_block_data(client, ZL6100_DEVICE_ID,
	device_id);
	if (ret < 0) {
	dev_err(&client->dev, "Failed to read device ID\n");
	return ret;
	}
	device_id[ret] = '\0';
	dev_info(&client->dev, "Device ID %s\n", device_id);

	mid = NULL;
	for (mid = zl6100_id; mid->name[0]; mid++) {
	if (!strncasecmp(mid->name, device_id, strlen(mid->name)))
	break;
	}
	if (!mid->name[0]) {
	dev_err(&client->dev, "Unsupported device\n");
	return -ENODEV;
	}
	if (id->driver_data != mid->driver_data)
	dev_notice(&client->dev,
	"Device mismatch: Configured %s, detected %s\n",
	id->name, mid->name);

	data = kzalloc(sizeof(struct zl6100_data), GFP_KERNEL);
	if (!data)
	return -ENOMEM;

	data->id = mid->driver_data;

	/*
	* According to information from the chip vendor, all currently
	* supported chips are known to require a wait time between I2C
	* accesses.
	*/
	data->delay = delay;

	/*
	* Since there was a direct I2C device access above, wait before
	* accessing the chip again.
	*/
	data->access = ktime_get();
	zl6100_wait(data);

	info = &data->info;

	info->pages = 1;
	info->func[0] = PMBUS_HAVE_VIN \| PMBUS_HAVE_STATUS_INPUT
	\| PMBUS_HAVE_VOUT \| PMBUS_HAVE_STATUS_VOUT
	\| PMBUS_HAVE_IOUT \| PMBUS_HAVE_STATUS_IOUT
	\| PMBUS_HAVE_TEMP \| PMBUS_HAVE_STATUS_TEMP;

	ret = i2c_smbus_read_word_data(client, ZL6100_MFR_CONFIG);
	if (ret < 0)
	goto err_mem;
	if (ret & ZL6100_MFR_XTEMP_ENABLE)
	info->func[0] \|= PMBUS_HAVE_TEMP2;

	data->access = ktime_get();
	zl6100_wait(data);

	info->read_word_data = zl6100_read_word_data;
	info->read_byte_data = zl6100_read_byte_data;
	info->write_word_data = zl6100_write_word_data;
	info->write_byte = zl6100_write_byte;

	ret = pmbus_do_probe(client, mid, info);
	if (ret)
	goto err_mem;
	return 0;

	err_mem:
	kfree(data);
	return ret;
	}

	static int zl6100_remove(struct i2c_client *client)
	{
	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
	const struct zl6100_data *data = to_zl6100_data(info);

	pmbus_do_remove(client);
	kfree(data);
	return 0;
	}

	static struct i2c_driver zl6100_driver = {
	.driver = {
	.name = "zl6100",
	},
	.probe = zl6100_probe,
	.remove = zl6100_remove,
	.id_table = zl6100_id,
	};

	static int __init zl6100_init(void)
	{
	return i2c_add_driver(&zl6100_driver);
	}

	static void __exit zl6100_exit(void)
	{
	i2c_del_driver(&zl6100_driver);
	}

	MODULE_AUTHOR("Guenter Roeck");
	MODULE_DESCRIPTION("PMBus driver for ZL6100 and compatibles");
	MODULE_LICENSE("GPL");
	module_init(zl6100_init);
	module_exit(zl6100_exit);