drivers/hwmon/pmbus/pmbus.c - linux - Git at Google

 /*
  * Hardware monitoring driver for PMBus devices
  *
  * Copyright (c) 2010, 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/mutex.h>
 #include <linux/i2c.h>
 #include <linux/pmbus.h>
 #include "pmbus.h"

 struct pmbus_device_info {
 	int pages;
 	u32 flags;
 };

 /*
  * Find sensor groups and status registers on each page.
  */
 static void pmbus_find_sensor_groups(struct i2c_client *client,
 				     struct pmbus_driver_info *info)
 {
 	int page;

 	/* Sensors detected on page 0 only */
 	if (pmbus_check_word_register(client, 0, PMBUS_READ_VIN))
 		info->func[0] |= PMBUS_HAVE_VIN;
 	if (pmbus_check_word_register(client, 0, PMBUS_READ_VCAP))
 		info->func[0] |= PMBUS_HAVE_VCAP;
 	if (pmbus_check_word_register(client, 0, PMBUS_READ_IIN))
 		info->func[0] |= PMBUS_HAVE_IIN;
 	if (pmbus_check_word_register(client, 0, PMBUS_READ_PIN))
 		info->func[0] |= PMBUS_HAVE_PIN;
 	if (info->func[0]
 	    && pmbus_check_byte_register(client, 0, PMBUS_STATUS_INPUT))
 		info->func[0] |= PMBUS_HAVE_STATUS_INPUT;
 	if (pmbus_check_byte_register(client, 0, PMBUS_FAN_CONFIG_12) &&
 	    pmbus_check_word_register(client, 0, PMBUS_READ_FAN_SPEED_1)) {
 		info->func[0] |= PMBUS_HAVE_FAN12;
 		if (pmbus_check_byte_register(client, 0, PMBUS_STATUS_FAN_12))
 			info->func[0] |= PMBUS_HAVE_STATUS_FAN12;
 	}
 	if (pmbus_check_byte_register(client, 0, PMBUS_FAN_CONFIG_34) &&
 	    pmbus_check_word_register(client, 0, PMBUS_READ_FAN_SPEED_3)) {
 		info->func[0] |= PMBUS_HAVE_FAN34;
 		if (pmbus_check_byte_register(client, 0, PMBUS_STATUS_FAN_34))
 			info->func[0] |= PMBUS_HAVE_STATUS_FAN34;
 	}
 	if (pmbus_check_word_register(client, 0, PMBUS_READ_TEMPERATURE_1))
 		info->func[0] |= PMBUS_HAVE_TEMP;
 	if (pmbus_check_word_register(client, 0, PMBUS_READ_TEMPERATURE_2))
 		info->func[0] |= PMBUS_HAVE_TEMP2;
 	if (pmbus_check_word_register(client, 0, PMBUS_READ_TEMPERATURE_3))
 		info->func[0] |= PMBUS_HAVE_TEMP3;
 	if (info->func[0] & (PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2
 			     | PMBUS_HAVE_TEMP3)
 	    && pmbus_check_byte_register(client, 0,
 					 PMBUS_STATUS_TEMPERATURE))
 			info->func[0] |= PMBUS_HAVE_STATUS_TEMP;

 	/* Sensors detected on all pages */
 	for (page = 0; page < info->pages; page++) {
 		if (pmbus_check_word_register(client, page, PMBUS_READ_VOUT)) {
 			info->func[page] |= PMBUS_HAVE_VOUT;
 			if (pmbus_check_byte_register(client, page,
 						      PMBUS_STATUS_VOUT))
 				info->func[page] |= PMBUS_HAVE_STATUS_VOUT;
 		}
 		if (pmbus_check_word_register(client, page, PMBUS_READ_IOUT)) {
 			info->func[page] |= PMBUS_HAVE_IOUT;
 			if (pmbus_check_byte_register(client, 0,
 						      PMBUS_STATUS_IOUT))
 				info->func[page] |= PMBUS_HAVE_STATUS_IOUT;
 		}
 		if (pmbus_check_word_register(client, page, PMBUS_READ_POUT))
 			info->func[page] |= PMBUS_HAVE_POUT;
 	}
 }

 /*
  * Identify chip parameters.
  */
 static int pmbus_identify(struct i2c_client *client,
 			  struct pmbus_driver_info *info)
 {
 	int ret = 0;

 	if (!info->pages) {
 		/*
 		 * Check if the PAGE command is supported. If it is,
 		 * keep setting the page number until it fails or until the
 		 * maximum number of pages has been reached. Assume that
 		 * this is the number of pages supported by the chip.
 		 */
 		if (pmbus_check_byte_register(client, 0, PMBUS_PAGE)) {
 			int page;

 			for (page = 1; page < PMBUS_PAGES; page++) {
 				if (pmbus_set_page(client, page) < 0)
 					break;
 			}
 			pmbus_set_page(client, 0);
 			info->pages = page;
 		} else {
 			info->pages = 1;
 		}

 		pmbus_clear_faults(client);
 	}

 	if (pmbus_check_byte_register(client, 0, PMBUS_VOUT_MODE)) {
 		int vout_mode;

 		vout_mode = pmbus_read_byte_data(client, 0, PMBUS_VOUT_MODE);
 		if (vout_mode >= 0 && vout_mode != 0xff) {
 			switch (vout_mode >> 5) {
 			case 0:
 				break;
 			case 1:
 				info->format[PSC_VOLTAGE_OUT] = vid;
 				info->vrm_version = vr11;
 				break;
 			case 2:
 				info->format[PSC_VOLTAGE_OUT] = direct;
 				break;
 			default:
 				ret = -ENODEV;
 				goto abort;
 			}
 		}
 	}

 	/*
 	 * We should check if the COEFFICIENTS register is supported.
 	 * If it is, and the chip is configured for direct mode, we can read
 	 * the coefficients from the chip, one set per group of sensor
 	 * registers.
 	 *
 	 * To do this, we will need access to a chip which actually supports the
 	 * COEFFICIENTS command, since the command is too complex to implement
 	 * without testing it. Until then, abort if a chip configured for direct
 	 * mode was detected.
 	 */
 	if (info->format[PSC_VOLTAGE_OUT] == direct) {
 		ret = -ENODEV;
 		goto abort;
 	}

 	/* Try to find sensor groups  */
 	pmbus_find_sensor_groups(client, info);
 abort:
 	return ret;
 }

 static int pmbus_probe(struct i2c_client *client,
 		       const struct i2c_device_id *id)
 {
 	struct pmbus_driver_info *info;
 	struct pmbus_platform_data *pdata = NULL;
 	struct device *dev = &client->dev;
 	struct pmbus_device_info *device_info;

 	info = devm_kzalloc(dev, sizeof(struct pmbus_driver_info), GFP_KERNEL);
 	if (!info)
 		return -ENOMEM;

 	device_info = (struct pmbus_device_info *)id->driver_data;
 	if (device_info->flags & PMBUS_SKIP_STATUS_CHECK) {
 		pdata = devm_kzalloc(dev, sizeof(struct pmbus_platform_data),
 				     GFP_KERNEL);
 		if (!pdata)
 			return -ENOMEM;

 		pdata->flags = PMBUS_SKIP_STATUS_CHECK;
 	}

 	info->pages = device_info->pages;
 	info->identify = pmbus_identify;
 	dev->platform_data = pdata;

 	return pmbus_do_probe(client, id, info);
 }

 static const struct pmbus_device_info pmbus_info_one = {
 	.pages = 1,
 	.flags = 0
 };
 static const struct pmbus_device_info pmbus_info_zero = {
 	.pages = 0,
 	.flags = 0
 };
 static const struct pmbus_device_info pmbus_info_one_skip = {
 	.pages = 1,
 	.flags = PMBUS_SKIP_STATUS_CHECK
 };

 /*
  * Use driver_data to set the number of pages supported by the chip.
  */
 static const struct i2c_device_id pmbus_id[] = {
 	{"adp4000", (kernel_ulong_t)&pmbus_info_one},
 	{"bmr453", (kernel_ulong_t)&pmbus_info_one},
 	{"bmr454", (kernel_ulong_t)&pmbus_info_one},
 	{"dps460", (kernel_ulong_t)&pmbus_info_one_skip},
 	{"dps650ab", (kernel_ulong_t)&pmbus_info_one_skip},
 	{"dps800", (kernel_ulong_t)&pmbus_info_one_skip},
 	{"mdt040", (kernel_ulong_t)&pmbus_info_one},
 	{"ncp4200", (kernel_ulong_t)&pmbus_info_one},
 	{"ncp4208", (kernel_ulong_t)&pmbus_info_one},
 	{"pdt003", (kernel_ulong_t)&pmbus_info_one},
 	{"pdt006", (kernel_ulong_t)&pmbus_info_one},
 	{"pdt012", (kernel_ulong_t)&pmbus_info_one},
 	{"pmbus", (kernel_ulong_t)&pmbus_info_zero},
 	{"sgd009", (kernel_ulong_t)&pmbus_info_one_skip},
 	{"tps40400", (kernel_ulong_t)&pmbus_info_one},
 	{"tps544b20", (kernel_ulong_t)&pmbus_info_one},
 	{"tps544b25", (kernel_ulong_t)&pmbus_info_one},
 	{"tps544c20", (kernel_ulong_t)&pmbus_info_one},
 	{"tps544c25", (kernel_ulong_t)&pmbus_info_one},
 	{"udt020", (kernel_ulong_t)&pmbus_info_one},
 	{}
 };

 MODULE_DEVICE_TABLE(i2c, pmbus_id);

 /* This is the driver that will be inserted */
 static struct i2c_driver pmbus_driver = {
 	.driver = {
 		   .name = "pmbus",
 		   },
 	.probe = pmbus_probe,
 	.remove = pmbus_do_remove,
 	.id_table = pmbus_id,
 };

 module_i2c_driver(pmbus_driver);

 MODULE_AUTHOR("Guenter Roeck");
 MODULE_DESCRIPTION("Generic PMBus driver");
 MODULE_LICENSE("GPL");
	/*
	* Hardware monitoring driver for PMBus devices
	*
	* Copyright (c) 2010, 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/mutex.h>
	#include <linux/i2c.h>
	#include <linux/pmbus.h>
	#include "pmbus.h"

	struct pmbus_device_info {
	int pages;
	u32 flags;
	};

	/*
	* Find sensor groups and status registers on each page.
	*/
	static void pmbus_find_sensor_groups(struct i2c_client *client,
	struct pmbus_driver_info *info)
	{
	int page;

	/* Sensors detected on page 0 only */
	if (pmbus_check_word_register(client, 0, PMBUS_READ_VIN))
	info->func[0] \|= PMBUS_HAVE_VIN;
	if (pmbus_check_word_register(client, 0, PMBUS_READ_VCAP))
	info->func[0] \|= PMBUS_HAVE_VCAP;
	if (pmbus_check_word_register(client, 0, PMBUS_READ_IIN))
	info->func[0] \|= PMBUS_HAVE_IIN;
	if (pmbus_check_word_register(client, 0, PMBUS_READ_PIN))
	info->func[0] \|= PMBUS_HAVE_PIN;
	if (info->func[0]
	&& pmbus_check_byte_register(client, 0, PMBUS_STATUS_INPUT))
	info->func[0] \|= PMBUS_HAVE_STATUS_INPUT;
	if (pmbus_check_byte_register(client, 0, PMBUS_FAN_CONFIG_12) &&
	pmbus_check_word_register(client, 0, PMBUS_READ_FAN_SPEED_1)) {
	info->func[0] \|= PMBUS_HAVE_FAN12;
	if (pmbus_check_byte_register(client, 0, PMBUS_STATUS_FAN_12))
	info->func[0] \|= PMBUS_HAVE_STATUS_FAN12;
	}
	if (pmbus_check_byte_register(client, 0, PMBUS_FAN_CONFIG_34) &&
	pmbus_check_word_register(client, 0, PMBUS_READ_FAN_SPEED_3)) {
	info->func[0] \|= PMBUS_HAVE_FAN34;
	if (pmbus_check_byte_register(client, 0, PMBUS_STATUS_FAN_34))
	info->func[0] \|= PMBUS_HAVE_STATUS_FAN34;
	}
	if (pmbus_check_word_register(client, 0, PMBUS_READ_TEMPERATURE_1))
	info->func[0] \|= PMBUS_HAVE_TEMP;
	if (pmbus_check_word_register(client, 0, PMBUS_READ_TEMPERATURE_2))
	info->func[0] \|= PMBUS_HAVE_TEMP2;
	if (pmbus_check_word_register(client, 0, PMBUS_READ_TEMPERATURE_3))
	info->func[0] \|= PMBUS_HAVE_TEMP3;
	if (info->func[0] & (PMBUS_HAVE_TEMP \| PMBUS_HAVE_TEMP2
	\| PMBUS_HAVE_TEMP3)
	&& pmbus_check_byte_register(client, 0,
	PMBUS_STATUS_TEMPERATURE))
	info->func[0] \|= PMBUS_HAVE_STATUS_TEMP;

	/* Sensors detected on all pages */
	for (page = 0; page < info->pages; page++) {
	if (pmbus_check_word_register(client, page, PMBUS_READ_VOUT)) {
	info->func[page] \|= PMBUS_HAVE_VOUT;
	if (pmbus_check_byte_register(client, page,
	PMBUS_STATUS_VOUT))
	info->func[page] \|= PMBUS_HAVE_STATUS_VOUT;
	}
	if (pmbus_check_word_register(client, page, PMBUS_READ_IOUT)) {
	info->func[page] \|= PMBUS_HAVE_IOUT;
	if (pmbus_check_byte_register(client, 0,
	PMBUS_STATUS_IOUT))
	info->func[page] \|= PMBUS_HAVE_STATUS_IOUT;
	}
	if (pmbus_check_word_register(client, page, PMBUS_READ_POUT))
	info->func[page] \|= PMBUS_HAVE_POUT;
	}
	}

	/*
	* Identify chip parameters.
	*/
	static int pmbus_identify(struct i2c_client *client,
	struct pmbus_driver_info *info)
	{
	int ret = 0;

	if (!info->pages) {
	/*
	* Check if the PAGE command is supported. If it is,
	* keep setting the page number until it fails or until the
	* maximum number of pages has been reached. Assume that
	* this is the number of pages supported by the chip.
	*/
	if (pmbus_check_byte_register(client, 0, PMBUS_PAGE)) {
	int page;

	for (page = 1; page < PMBUS_PAGES; page++) {
	if (pmbus_set_page(client, page) < 0)
	break;
	}
	pmbus_set_page(client, 0);
	info->pages = page;
	} else {
	info->pages = 1;
	}

	pmbus_clear_faults(client);
	}

	if (pmbus_check_byte_register(client, 0, PMBUS_VOUT_MODE)) {
	int vout_mode;

	vout_mode = pmbus_read_byte_data(client, 0, PMBUS_VOUT_MODE);
	if (vout_mode >= 0 && vout_mode != 0xff) {
	switch (vout_mode >> 5) {
	case 0:
	break;
	case 1:
	info->format[PSC_VOLTAGE_OUT] = vid;
	info->vrm_version = vr11;
	break;
	case 2:
	info->format[PSC_VOLTAGE_OUT] = direct;
	break;
	default:
	ret = -ENODEV;
	goto abort;
	}
	}
	}

	/*
	* We should check if the COEFFICIENTS register is supported.
	* If it is, and the chip is configured for direct mode, we can read
	* the coefficients from the chip, one set per group of sensor
	* registers.
	*
	* To do this, we will need access to a chip which actually supports the
	* COEFFICIENTS command, since the command is too complex to implement
	* without testing it. Until then, abort if a chip configured for direct
	* mode was detected.
	*/
	if (info->format[PSC_VOLTAGE_OUT] == direct) {
	ret = -ENODEV;
	goto abort;
	}

	/* Try to find sensor groups */
	pmbus_find_sensor_groups(client, info);
	abort:
	return ret;
	}

	static int pmbus_probe(struct i2c_client *client,
	const struct i2c_device_id *id)
	{
	struct pmbus_driver_info *info;
	struct pmbus_platform_data *pdata = NULL;
	struct device *dev = &client->dev;
	struct pmbus_device_info *device_info;

	info = devm_kzalloc(dev, sizeof(struct pmbus_driver_info), GFP_KERNEL);
	if (!info)
	return -ENOMEM;

	device_info = (struct pmbus_device_info *)id->driver_data;
	if (device_info->flags & PMBUS_SKIP_STATUS_CHECK) {
	pdata = devm_kzalloc(dev, sizeof(struct pmbus_platform_data),
	GFP_KERNEL);
	if (!pdata)
	return -ENOMEM;

	pdata->flags = PMBUS_SKIP_STATUS_CHECK;
	}

	info->pages = device_info->pages;
	info->identify = pmbus_identify;
	dev->platform_data = pdata;

	return pmbus_do_probe(client, id, info);
	}

	static const struct pmbus_device_info pmbus_info_one = {
	.pages = 1,
	.flags = 0
	};
	static const struct pmbus_device_info pmbus_info_zero = {
	.pages = 0,
	.flags = 0
	};
	static const struct pmbus_device_info pmbus_info_one_skip = {
	.pages = 1,
	.flags = PMBUS_SKIP_STATUS_CHECK
	};

	/*
	* Use driver_data to set the number of pages supported by the chip.
	*/
	static const struct i2c_device_id pmbus_id[] = {
	{"adp4000", (kernel_ulong_t)&pmbus_info_one},
	{"bmr453", (kernel_ulong_t)&pmbus_info_one},
	{"bmr454", (kernel_ulong_t)&pmbus_info_one},
	{"dps460", (kernel_ulong_t)&pmbus_info_one_skip},
	{"dps650ab", (kernel_ulong_t)&pmbus_info_one_skip},
	{"dps800", (kernel_ulong_t)&pmbus_info_one_skip},
	{"mdt040", (kernel_ulong_t)&pmbus_info_one},
	{"ncp4200", (kernel_ulong_t)&pmbus_info_one},
	{"ncp4208", (kernel_ulong_t)&pmbus_info_one},
	{"pdt003", (kernel_ulong_t)&pmbus_info_one},
	{"pdt006", (kernel_ulong_t)&pmbus_info_one},
	{"pdt012", (kernel_ulong_t)&pmbus_info_one},
	{"pmbus", (kernel_ulong_t)&pmbus_info_zero},
	{"sgd009", (kernel_ulong_t)&pmbus_info_one_skip},
	{"tps40400", (kernel_ulong_t)&pmbus_info_one},
	{"tps544b20", (kernel_ulong_t)&pmbus_info_one},
	{"tps544b25", (kernel_ulong_t)&pmbus_info_one},
	{"tps544c20", (kernel_ulong_t)&pmbus_info_one},
	{"tps544c25", (kernel_ulong_t)&pmbus_info_one},
	{"udt020", (kernel_ulong_t)&pmbus_info_one},
	{}
	};

	MODULE_DEVICE_TABLE(i2c, pmbus_id);

	/* This is the driver that will be inserted */
	static struct i2c_driver pmbus_driver = {
	.driver = {
	.name = "pmbus",
	},
	.probe = pmbus_probe,
	.remove = pmbus_do_remove,
	.id_table = pmbus_id,
	};

	module_i2c_driver(pmbus_driver);

	MODULE_AUTHOR("Guenter Roeck");
	MODULE_DESCRIPTION("Generic PMBus driver");
	MODULE_LICENSE("GPL");