drivers/hwmon/pmbus/ucd9000.c - kernel/mindspeed - Git at Google

 /*
  * Hardware monitoring driver for UCD90xxx Sequencer and System Health
  * Controller series
  *
  * 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/i2c/pmbus.h>
 #include "pmbus.h"

 enum chips { ucd9000, ucd90120, ucd90124, ucd9090, ucd90910 };

 #define UCD9000_MONITOR_CONFIG		0xd5
 #define UCD9000_NUM_PAGES		0xd6
 #define UCD9000_FAN_CONFIG_INDEX	0xe7
 #define UCD9000_FAN_CONFIG		0xe8
 #define UCD9000_DEVICE_ID		0xfd

 #define UCD9000_MON_TYPE(x)	(((x) >> 5) & 0x07)
 #define UCD9000_MON_PAGE(x)	((x) & 0x0f)

 #define UCD9000_MON_VOLTAGE	1
 #define UCD9000_MON_TEMPERATURE	2
 #define UCD9000_MON_CURRENT	3
 #define UCD9000_MON_VOLTAGE_HW	4

 #define UCD9000_NUM_FAN		4

 struct ucd9000_data {
 	u8 fan_data[UCD9000_NUM_FAN][I2C_SMBUS_BLOCK_MAX];
 	struct pmbus_driver_info info;
 };
 #define to_ucd9000_data(_info) container_of(_info, struct ucd9000_data, info)

 static int ucd9000_get_fan_config(struct i2c_client *client, int fan)
 {
 	int fan_config = 0;
 	struct ucd9000_data *data
 	  = to_ucd9000_data(pmbus_get_driver_info(client));

 	if (data->fan_data[fan][3] & 1)
 		fan_config |= PB_FAN_2_INSTALLED;   /* Use lower bit position */

 	/* Pulses/revolution */
 	fan_config |= (data->fan_data[fan][3] & 0x06) >> 1;

 	return fan_config;
 }

 static int ucd9000_read_byte_data(struct i2c_client *client, int page, int reg)
 {
 	int ret = 0;
 	int fan_config;

 	switch (reg) {
 	case PMBUS_FAN_CONFIG_12:
 		if (page > 0)
 			return -ENXIO;

 		ret = ucd9000_get_fan_config(client, 0);
 		if (ret < 0)
 			return ret;
 		fan_config = ret << 4;
 		ret = ucd9000_get_fan_config(client, 1);
 		if (ret < 0)
 			return ret;
 		fan_config |= ret;
 		ret = fan_config;
 		break;
 	case PMBUS_FAN_CONFIG_34:
 		if (page > 0)
 			return -ENXIO;

 		ret = ucd9000_get_fan_config(client, 2);
 		if (ret < 0)
 			return ret;
 		fan_config = ret << 4;
 		ret = ucd9000_get_fan_config(client, 3);
 		if (ret < 0)
 			return ret;
 		fan_config |= ret;
 		ret = fan_config;
 		break;
 	default:
 		ret = -ENODATA;
 		break;
 	}
 	return ret;
 }

 static const struct i2c_device_id ucd9000_id[] = {
 	{"ucd9000", ucd9000},
 	{"ucd90120", ucd90120},
 	{"ucd90124", ucd90124},
 	{"ucd9090", ucd9090},
 	{"ucd90910", ucd90910},
 	{}
 };
 MODULE_DEVICE_TABLE(i2c, ucd9000_id);

 static int ucd9000_probe(struct i2c_client *client,
 			 const struct i2c_device_id *id)
 {
 	u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1];
 	struct ucd9000_data *data;
 	struct pmbus_driver_info *info;
 	const struct i2c_device_id *mid;
 	int i, ret;

 	if (!i2c_check_functionality(client->adapter,
 				     I2C_FUNC_SMBUS_BYTE_DATA |
 				     I2C_FUNC_SMBUS_BLOCK_DATA))
 		return -ENODEV;

 	ret = i2c_smbus_read_block_data(client, UCD9000_DEVICE_ID,
 					block_buffer);
 	if (ret < 0) {
 		dev_err(&client->dev, "Failed to read device ID\n");
 		return ret;
 	}
 	block_buffer[ret] = '\0';
 	dev_info(&client->dev, "Device ID %s\n", block_buffer);

 	for (mid = ucd9000_id; mid->name[0]; mid++) {
 		if (!strncasecmp(mid->name, block_buffer, strlen(mid->name)))
 			break;
 	}
 	if (!mid->name[0]) {
 		dev_err(&client->dev, "Unsupported device\n");
 		return -ENODEV;
 	}

 	if (id->driver_data != ucd9000 && 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 ucd9000_data), GFP_KERNEL);
 	if (!data)
 		return -ENOMEM;
 	info = &data->info;

 	ret = i2c_smbus_read_byte_data(client, UCD9000_NUM_PAGES);
 	if (ret < 0) {
 		dev_err(&client->dev,
 			"Failed to read number of active pages\n");
 		goto out;
 	}
 	info->pages = ret;
 	if (!info->pages) {
 		dev_err(&client->dev, "No pages configured\n");
 		ret = -ENODEV;
 		goto out;
 	}

 	/* The internal temperature sensor is always active */
 	info->func[0] = PMBUS_HAVE_TEMP;

 	/* Everything else is configurable */
 	ret = i2c_smbus_read_block_data(client, UCD9000_MONITOR_CONFIG,
 					block_buffer);
 	if (ret <= 0) {
 		dev_err(&client->dev, "Failed to read configuration data\n");
 		ret = -ENODEV;
 		goto out;
 	}
 	for (i = 0; i < ret; i++) {
 		int page = UCD9000_MON_PAGE(block_buffer[i]);

 		if (page >= info->pages)
 			continue;

 		switch (UCD9000_MON_TYPE(block_buffer[i])) {
 		case UCD9000_MON_VOLTAGE:
 		case UCD9000_MON_VOLTAGE_HW:
 			info->func[page] |= PMBUS_HAVE_VOUT
 			  | PMBUS_HAVE_STATUS_VOUT;
 			break;
 		case UCD9000_MON_TEMPERATURE:
 			info->func[page] |= PMBUS_HAVE_TEMP2
 			  | PMBUS_HAVE_STATUS_TEMP;
 			break;
 		case UCD9000_MON_CURRENT:
 			info->func[page] |= PMBUS_HAVE_IOUT
 			  | PMBUS_HAVE_STATUS_IOUT;
 			break;
 		default:
 			break;
 		}
 	}

 	/* Fan configuration */
 	if (mid->driver_data == ucd90124) {
 		for (i = 0; i < UCD9000_NUM_FAN; i++) {
 			i2c_smbus_write_byte_data(client,
 						  UCD9000_FAN_CONFIG_INDEX, i);
 			ret = i2c_smbus_read_block_data(client,
 							UCD9000_FAN_CONFIG,
 							data->fan_data[i]);
 			if (ret < 0)
 				goto out;
 		}
 		i2c_smbus_write_byte_data(client, UCD9000_FAN_CONFIG_INDEX, 0);

 		info->read_byte_data = ucd9000_read_byte_data;
 		info->func[0] |= PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12
 		  | PMBUS_HAVE_FAN34 | PMBUS_HAVE_STATUS_FAN34;
 	}

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

 out:
 	kfree(data);
 	return ret;
 }

 static int ucd9000_remove(struct i2c_client *client)
 {
 	struct ucd9000_data *data;

 	data = to_ucd9000_data(pmbus_get_driver_info(client));
 	pmbus_do_remove(client);
 	kfree(data);
 	return 0;
 }


 /* This is the driver that will be inserted */
 static struct i2c_driver ucd9000_driver = {
 	.driver = {
 		.name = "ucd9000",
 	},
 	.probe = ucd9000_probe,
 	.remove = ucd9000_remove,
 	.id_table = ucd9000_id,
 };

 static int __init ucd9000_init(void)
 {
 	return i2c_add_driver(&ucd9000_driver);
 }

 static void __exit ucd9000_exit(void)
 {
 	i2c_del_driver(&ucd9000_driver);
 }

 MODULE_AUTHOR("Guenter Roeck");
 MODULE_DESCRIPTION("PMBus driver for TI UCD90xxx");
 MODULE_LICENSE("GPL");
 module_init(ucd9000_init);
 module_exit(ucd9000_exit);
	/*
	* Hardware monitoring driver for UCD90xxx Sequencer and System Health
	* Controller series
	*
	* 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/i2c/pmbus.h>
	#include "pmbus.h"

	enum chips { ucd9000, ucd90120, ucd90124, ucd9090, ucd90910 };

	#define UCD9000_MONITOR_CONFIG 0xd5
	#define UCD9000_NUM_PAGES 0xd6
	#define UCD9000_FAN_CONFIG_INDEX 0xe7
	#define UCD9000_FAN_CONFIG 0xe8
	#define UCD9000_DEVICE_ID 0xfd

	#define UCD9000_MON_TYPE(x) (((x) >> 5) & 0x07)
	#define UCD9000_MON_PAGE(x) ((x) & 0x0f)

	#define UCD9000_MON_VOLTAGE 1
	#define UCD9000_MON_TEMPERATURE 2
	#define UCD9000_MON_CURRENT 3
	#define UCD9000_MON_VOLTAGE_HW 4

	#define UCD9000_NUM_FAN 4

	struct ucd9000_data {
	u8 fan_data[UCD9000_NUM_FAN][I2C_SMBUS_BLOCK_MAX];
	struct pmbus_driver_info info;
	};
	#define to_ucd9000_data(_info) container_of(_info, struct ucd9000_data, info)

	static int ucd9000_get_fan_config(struct i2c_client *client, int fan)
	{
	int fan_config = 0;
	struct ucd9000_data *data
	= to_ucd9000_data(pmbus_get_driver_info(client));

	if (data->fan_data[fan][3] & 1)
	fan_config \|= PB_FAN_2_INSTALLED; /* Use lower bit position */

	/* Pulses/revolution */
	fan_config \|= (data->fan_data[fan][3] & 0x06) >> 1;

	return fan_config;
	}

	static int ucd9000_read_byte_data(struct i2c_client *client, int page, int reg)
	{
	int ret = 0;
	int fan_config;

	switch (reg) {
	case PMBUS_FAN_CONFIG_12:
	if (page > 0)
	return -ENXIO;

	ret = ucd9000_get_fan_config(client, 0);
	if (ret < 0)
	return ret;
	fan_config = ret << 4;
	ret = ucd9000_get_fan_config(client, 1);
	if (ret < 0)
	return ret;
	fan_config \|= ret;
	ret = fan_config;
	break;
	case PMBUS_FAN_CONFIG_34:
	if (page > 0)
	return -ENXIO;

	ret = ucd9000_get_fan_config(client, 2);
	if (ret < 0)
	return ret;
	fan_config = ret << 4;
	ret = ucd9000_get_fan_config(client, 3);
	if (ret < 0)
	return ret;
	fan_config \|= ret;
	ret = fan_config;
	break;
	default:
	ret = -ENODATA;
	break;
	}
	return ret;
	}

	static const struct i2c_device_id ucd9000_id[] = {
	{"ucd9000", ucd9000},
	{"ucd90120", ucd90120},
	{"ucd90124", ucd90124},
	{"ucd9090", ucd9090},
	{"ucd90910", ucd90910},
	{}
	};
	MODULE_DEVICE_TABLE(i2c, ucd9000_id);

	static int ucd9000_probe(struct i2c_client *client,
	const struct i2c_device_id *id)
	{
	u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1];
	struct ucd9000_data *data;
	struct pmbus_driver_info *info;
	const struct i2c_device_id *mid;
	int i, ret;

	if (!i2c_check_functionality(client->adapter,
	I2C_FUNC_SMBUS_BYTE_DATA \|
	I2C_FUNC_SMBUS_BLOCK_DATA))
	return -ENODEV;

	ret = i2c_smbus_read_block_data(client, UCD9000_DEVICE_ID,
	block_buffer);
	if (ret < 0) {
	dev_err(&client->dev, "Failed to read device ID\n");
	return ret;
	}
	block_buffer[ret] = '\0';
	dev_info(&client->dev, "Device ID %s\n", block_buffer);

	for (mid = ucd9000_id; mid->name[0]; mid++) {
	if (!strncasecmp(mid->name, block_buffer, strlen(mid->name)))
	break;
	}
	if (!mid->name[0]) {
	dev_err(&client->dev, "Unsupported device\n");
	return -ENODEV;
	}

	if (id->driver_data != ucd9000 && 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 ucd9000_data), GFP_KERNEL);
	if (!data)
	return -ENOMEM;
	info = &data->info;

	ret = i2c_smbus_read_byte_data(client, UCD9000_NUM_PAGES);
	if (ret < 0) {
	dev_err(&client->dev,
	"Failed to read number of active pages\n");
	goto out;
	}
	info->pages = ret;
	if (!info->pages) {
	dev_err(&client->dev, "No pages configured\n");
	ret = -ENODEV;
	goto out;
	}

	/* The internal temperature sensor is always active */
	info->func[0] = PMBUS_HAVE_TEMP;

	/* Everything else is configurable */
	ret = i2c_smbus_read_block_data(client, UCD9000_MONITOR_CONFIG,
	block_buffer);
	if (ret <= 0) {
	dev_err(&client->dev, "Failed to read configuration data\n");
	ret = -ENODEV;
	goto out;
	}
	for (i = 0; i < ret; i++) {
	int page = UCD9000_MON_PAGE(block_buffer[i]);

	if (page >= info->pages)
	continue;

	switch (UCD9000_MON_TYPE(block_buffer[i])) {
	case UCD9000_MON_VOLTAGE:
	case UCD9000_MON_VOLTAGE_HW:
	info->func[page] \|= PMBUS_HAVE_VOUT
	\| PMBUS_HAVE_STATUS_VOUT;
	break;
	case UCD9000_MON_TEMPERATURE:
	info->func[page] \|= PMBUS_HAVE_TEMP2
	\| PMBUS_HAVE_STATUS_TEMP;
	break;
	case UCD9000_MON_CURRENT:
	info->func[page] \|= PMBUS_HAVE_IOUT
	\| PMBUS_HAVE_STATUS_IOUT;
	break;
	default:
	break;
	}
	}

	/* Fan configuration */
	if (mid->driver_data == ucd90124) {
	for (i = 0; i < UCD9000_NUM_FAN; i++) {
	i2c_smbus_write_byte_data(client,
	UCD9000_FAN_CONFIG_INDEX, i);
	ret = i2c_smbus_read_block_data(client,
	UCD9000_FAN_CONFIG,
	data->fan_data[i]);
	if (ret < 0)
	goto out;
	}
	i2c_smbus_write_byte_data(client, UCD9000_FAN_CONFIG_INDEX, 0);

	info->read_byte_data = ucd9000_read_byte_data;
	info->func[0] \|= PMBUS_HAVE_FAN12 \| PMBUS_HAVE_STATUS_FAN12
	\| PMBUS_HAVE_FAN34 \| PMBUS_HAVE_STATUS_FAN34;
	}

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

	out:
	kfree(data);
	return ret;
	}

	static int ucd9000_remove(struct i2c_client *client)
	{
	struct ucd9000_data *data;

	data = to_ucd9000_data(pmbus_get_driver_info(client));
	pmbus_do_remove(client);
	kfree(data);
	return 0;
	}


	/* This is the driver that will be inserted */
	static struct i2c_driver ucd9000_driver = {
	.driver = {
	.name = "ucd9000",
	},
	.probe = ucd9000_probe,
	.remove = ucd9000_remove,
	.id_table = ucd9000_id,
	};

	static int __init ucd9000_init(void)
	{
	return i2c_add_driver(&ucd9000_driver);
	}

	static void __exit ucd9000_exit(void)
	{
	i2c_del_driver(&ucd9000_driver);
	}

	MODULE_AUTHOR("Guenter Roeck");
	MODULE_DESCRIPTION("PMBus driver for TI UCD90xxx");
	MODULE_LICENSE("GPL");
	module_init(ucd9000_init);
	module_exit(ucd9000_exit);