drivers/hwmon/pmbus/lm25066.c - kernel/bruno - Git at Google

 /*
  * Hardware monitoring driver for LM25056 / LM25063 / LM25066 / LM5064 / LM5066
  *
  * Copyright (c) 2011 Ericsson AB.
  * Copyright (c) 2013 Guenter Roeck
  *
  * 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/bitops.h>
 #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 "pmbus.h"

 enum chips { lm25056, lm25063, lm25066, lm5064, lm5066 };

 #define LM25066_READ_VAUX		0xd0
 #define LM25066_MFR_READ_IIN		0xd1
 #define LM25066_MFR_READ_PIN		0xd2
 #define LM25066_MFR_IIN_OC_WARN_LIMIT	0xd3
 #define LM25066_MFR_PIN_OP_WARN_LIMIT	0xd4
 #define LM25066_READ_PIN_PEAK		0xd5
 #define LM25066_CLEAR_PIN_PEAK		0xd6
 #define LM25066_DEVICE_SETUP		0xd9
 #define LM25066_READ_AVG_VIN		0xdc
 #define LM25066_READ_AVG_VOUT		0xdd
 #define LM25066_READ_AVG_IIN		0xde
 #define LM25066_READ_AVG_PIN		0xdf

 #define LM25066_DEV_SETUP_CL		BIT(4)	/* Current limit */

 /* LM25056 only */

 #define LM25056_VAUX_OV_WARN_LIMIT	0xe3
 #define LM25056_VAUX_UV_WARN_LIMIT	0xe4

 #define LM25056_MFR_STS_VAUX_OV_WARN	BIT(1)
 #define LM25056_MFR_STS_VAUX_UV_WARN	BIT(0)

 /* LM25063 only */

 #define LM25063_READ_VOUT_MAX		0xe5
 #define LM25063_READ_VOUT_MIN		0xe6

 struct __coeff {
 	short m, b, R;
 };

 #define PSC_CURRENT_IN_L	(PSC_NUM_CLASSES)
 #define PSC_POWER_L		(PSC_NUM_CLASSES + 1)

 static struct __coeff lm25066_coeff[5][PSC_NUM_CLASSES + 2] = {
 	[lm25056] = {
 		[PSC_VOLTAGE_IN] = {
 			.m = 16296,
 			.R = -2,
 		},
 		[PSC_CURRENT_IN] = {
 			.m = 13797,
 			.R = -2,
 		},
 		[PSC_CURRENT_IN_L] = {
 			.m = 6726,
 			.R = -2,
 		},
 		[PSC_POWER] = {
 			.m = 5501,
 			.R = -3,
 		},
 		[PSC_POWER_L] = {
 			.m = 26882,
 			.R = -4,
 		},
 		[PSC_TEMPERATURE] = {
 			.m = 1580,
 			.b = -14500,
 			.R = -2,
 		},
 	},
 	[lm25066] = {
 		[PSC_VOLTAGE_IN] = {
 			.m = 22070,
 			.R = -2,
 		},
 		[PSC_VOLTAGE_OUT] = {
 			.m = 22070,
 			.R = -2,
 		},
 		[PSC_CURRENT_IN] = {
 			.m = 13661,
 			.R = -2,
 		},
 		[PSC_CURRENT_IN_L] = {
 			.m = 6852,
 			.R = -2,
 		},
 		[PSC_POWER] = {
 			.m = 736,
 			.R = -2,
 		},
 		[PSC_POWER_L] = {
 			.m = 369,
 			.R = -2,
 		},
 		[PSC_TEMPERATURE] = {
 			.m = 16,
 		},
 	},
 	[lm25063] = {
 		[PSC_VOLTAGE_IN] = {
 			.m = 16000,
 			.R = -2,
 		},
 		[PSC_VOLTAGE_OUT] = {
 			.m = 16000,
 			.R = -2,
 		},
 		[PSC_CURRENT_IN] = {
 			.m = 10000,
 			.R = -2,
 		},
 		[PSC_CURRENT_IN_L] = {
 			.m = 10000,
 			.R = -2,
 		},
 		[PSC_POWER] = {
 			.m = 5000,
 			.R = -3,
 		},
 		[PSC_POWER_L] = {
 			.m = 5000,
 			.R = -3,
 		},
 		[PSC_TEMPERATURE] = {
 			.m = 15596,
 			.R = -3,
 		},
 	},
 	[lm5064] = {
 		[PSC_VOLTAGE_IN] = {
 			.m = 4611,
 			.R = -2,
 		},
 		[PSC_VOLTAGE_OUT] = {
 			.m = 4621,
 			.R = -2,
 		},
 		[PSC_CURRENT_IN] = {
 			.m = 10742,
 			.R = -2,
 		},
 		[PSC_CURRENT_IN_L] = {
 			.m = 5456,
 			.R = -2,
 		},
 		[PSC_POWER] = {
 			.m = 1204,
 			.R = -3,
 		},
 		[PSC_POWER_L] = {
 			.m = 612,
 			.R = -3,
 		},
 		[PSC_TEMPERATURE] = {
 			.m = 16,
 		},
 	},
 	[lm5066] = {
 		[PSC_VOLTAGE_IN] = {
 			.m = 4587,
 			.R = -2,
 		},
 		[PSC_VOLTAGE_OUT] = {
 			.m = 4587,
 			.R = -2,
 		},
 		[PSC_CURRENT_IN] = {
 			.m = 10753,
 			.R = -2,
 		},
 		[PSC_CURRENT_IN_L] = {
 			.m = 5405,
 			.R = -2,
 		},
 		[PSC_POWER] = {
 			.m = 1204,
 			.R = -3,
 		},
 		[PSC_POWER_L] = {
 			.m = 605,
 			.R = -3,
 		},
 		[PSC_TEMPERATURE] = {
 			.m = 16,
 		},
 	},
 };

 struct lm25066_data {
 	int id;
 	u16 rlimit;			/* Maximum register value */
 	struct pmbus_driver_info info;
 };

 #define to_lm25066_data(x)  container_of(x, struct lm25066_data, info)

 static int lm25066_read_word_data(struct i2c_client *client, int page, int reg)
 {
 	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
 	const struct lm25066_data *data = to_lm25066_data(info);
 	int ret;

 	switch (reg) {
 	case PMBUS_VIRT_READ_VMON:
 		ret = pmbus_read_word_data(client, 0, LM25066_READ_VAUX);
 		if (ret < 0)
 			break;
 		/* Adjust returned value to match VIN coefficients */
 		switch (data->id) {
 		case lm25056:
 			/* VIN: 6.14 mV VAUX: 293 uV LSB */
 			ret = DIV_ROUND_CLOSEST(ret * 293, 6140);
 			break;
 		case lm25063:
 			/* VIN: 6.25 mV VAUX: 200.0 uV LSB */
 			ret = DIV_ROUND_CLOSEST(ret * 20, 625);
 			break;
 		case lm25066:
 			/* VIN: 4.54 mV VAUX: 283.2 uV LSB */
 			ret = DIV_ROUND_CLOSEST(ret * 2832, 45400);
 			break;
 		case lm5064:
 			/* VIN: 4.53 mV VAUX: 700 uV LSB */
 			ret = DIV_ROUND_CLOSEST(ret * 70, 453);
 			break;
 		case lm5066:
 			/* VIN: 2.18 mV VAUX: 725 uV LSB */
 			ret = DIV_ROUND_CLOSEST(ret * 725, 2180);
 			break;
 		}
 		break;
 	case PMBUS_READ_IIN:
 		ret = pmbus_read_word_data(client, 0, LM25066_MFR_READ_IIN);
 		break;
 	case PMBUS_READ_PIN:
 		ret = pmbus_read_word_data(client, 0, LM25066_MFR_READ_PIN);
 		break;
 	case PMBUS_IIN_OC_WARN_LIMIT:
 		ret = pmbus_read_word_data(client, 0,
 					   LM25066_MFR_IIN_OC_WARN_LIMIT);
 		break;
 	case PMBUS_PIN_OP_WARN_LIMIT:
 		ret = pmbus_read_word_data(client, 0,
 					   LM25066_MFR_PIN_OP_WARN_LIMIT);
 		break;
 	case PMBUS_VIRT_READ_VIN_AVG:
 		ret = pmbus_read_word_data(client, 0, LM25066_READ_AVG_VIN);
 		break;
 	case PMBUS_VIRT_READ_VOUT_AVG:
 		ret = pmbus_read_word_data(client, 0, LM25066_READ_AVG_VOUT);
 		break;
 	case PMBUS_VIRT_READ_IIN_AVG:
 		ret = pmbus_read_word_data(client, 0, LM25066_READ_AVG_IIN);
 		break;
 	case PMBUS_VIRT_READ_PIN_AVG:
 		ret = pmbus_read_word_data(client, 0, LM25066_READ_AVG_PIN);
 		break;
 	case PMBUS_VIRT_READ_PIN_MAX:
 		ret = pmbus_read_word_data(client, 0, LM25066_READ_PIN_PEAK);
 		break;
 	case PMBUS_VIRT_RESET_PIN_HISTORY:
 		ret = 0;
 		break;
 	default:
 		ret = -ENODATA;
 		break;
 	}
 	return ret;
 }

 static int lm25063_read_word_data(struct i2c_client *client, int page, int reg)
 {
 	int ret;

 	switch (reg) {
 	case PMBUS_VIRT_READ_VOUT_MAX:
 		ret = pmbus_read_word_data(client, 0, LM25063_READ_VOUT_MAX);
 		break;
 	case PMBUS_VIRT_READ_VOUT_MIN:
 		ret = pmbus_read_word_data(client, 0, LM25063_READ_VOUT_MIN);
 		break;
 	default:
 		ret = lm25066_read_word_data(client, page, reg);
 		break;
 	}
 	return ret;
 }

 static int lm25056_read_word_data(struct i2c_client *client, int page, int reg)
 {
 	int ret;

 	switch (reg) {
 	case PMBUS_VIRT_VMON_UV_WARN_LIMIT:
 		ret = pmbus_read_word_data(client, 0,
 					   LM25056_VAUX_UV_WARN_LIMIT);
 		if (ret < 0)
 			break;
 		/* Adjust returned value to match VIN coefficients */
 		ret = DIV_ROUND_CLOSEST(ret * 293, 6140);
 		break;
 	case PMBUS_VIRT_VMON_OV_WARN_LIMIT:
 		ret = pmbus_read_word_data(client, 0,
 					   LM25056_VAUX_OV_WARN_LIMIT);
 		if (ret < 0)
 			break;
 		/* Adjust returned value to match VIN coefficients */
 		ret = DIV_ROUND_CLOSEST(ret * 293, 6140);
 		break;
 	default:
 		ret = lm25066_read_word_data(client, page, reg);
 		break;
 	}
 	return ret;
 }

 static int lm25056_read_byte_data(struct i2c_client *client, int page, int reg)
 {
 	int ret, s;

 	switch (reg) {
 	case PMBUS_VIRT_STATUS_VMON:
 		ret = pmbus_read_byte_data(client, 0,
 					   PMBUS_STATUS_MFR_SPECIFIC);
 		if (ret < 0)
 			break;
 		s = 0;
 		if (ret & LM25056_MFR_STS_VAUX_UV_WARN)
 			s |= PB_VOLTAGE_UV_WARNING;
 		if (ret & LM25056_MFR_STS_VAUX_OV_WARN)
 			s |= PB_VOLTAGE_OV_WARNING;
 		ret = s;
 		break;
 	default:
 		ret = -ENODATA;
 		break;
 	}
 	return ret;
 }

 static int lm25066_write_word_data(struct i2c_client *client, int page, int reg,
 				   u16 word)
 {
 	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
 	const struct lm25066_data *data = to_lm25066_data(info);
 	int ret;

 	switch (reg) {
 	case PMBUS_POUT_OP_FAULT_LIMIT:
 	case PMBUS_POUT_OP_WARN_LIMIT:
 	case PMBUS_VOUT_UV_WARN_LIMIT:
 	case PMBUS_OT_FAULT_LIMIT:
 	case PMBUS_OT_WARN_LIMIT:
 	case PMBUS_IIN_OC_FAULT_LIMIT:
 	case PMBUS_VIN_UV_WARN_LIMIT:
 	case PMBUS_VIN_UV_FAULT_LIMIT:
 	case PMBUS_VIN_OV_FAULT_LIMIT:
 	case PMBUS_VIN_OV_WARN_LIMIT:
 		word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit);
 		ret = pmbus_write_word_data(client, 0, reg, word);
 		pmbus_clear_cache(client);
 		break;
 	case PMBUS_IIN_OC_WARN_LIMIT:
 		word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit);
 		ret = pmbus_write_word_data(client, 0,
 					    LM25066_MFR_IIN_OC_WARN_LIMIT,
 					    word);
 		pmbus_clear_cache(client);
 		break;
 	case PMBUS_PIN_OP_WARN_LIMIT:
 		word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit);
 		ret = pmbus_write_word_data(client, 0,
 					    LM25066_MFR_PIN_OP_WARN_LIMIT,
 					    word);
 		pmbus_clear_cache(client);
 		break;
 	case PMBUS_VIRT_VMON_UV_WARN_LIMIT:
 		/* Adjust from VIN coefficients (for LM25056) */
 		word = DIV_ROUND_CLOSEST((int)word * 6140, 293);
 		word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit);
 		ret = pmbus_write_word_data(client, 0,
 					    LM25056_VAUX_UV_WARN_LIMIT, word);
 		pmbus_clear_cache(client);
 		break;
 	case PMBUS_VIRT_VMON_OV_WARN_LIMIT:
 		/* Adjust from VIN coefficients (for LM25056) */
 		word = DIV_ROUND_CLOSEST((int)word * 6140, 293);
 		word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit);
 		ret = pmbus_write_word_data(client, 0,
 					    LM25056_VAUX_OV_WARN_LIMIT, word);
 		pmbus_clear_cache(client);
 		break;
 	case PMBUS_VIRT_RESET_PIN_HISTORY:
 		ret = pmbus_write_byte(client, 0, LM25066_CLEAR_PIN_PEAK);
 		break;
 	default:
 		ret = -ENODATA;
 		break;
 	}
 	return ret;
 }

 static int lm25066_probe(struct i2c_client *client,
 			  const struct i2c_device_id *id)
 {
 	int config;
 	struct lm25066_data *data;
 	struct pmbus_driver_info *info;
 	struct __coeff *coeff;

 	if (!i2c_check_functionality(client->adapter,
 				     I2C_FUNC_SMBUS_READ_BYTE_DATA))
 		return -ENODEV;

 	data = devm_kzalloc(&client->dev, sizeof(struct lm25066_data),
 			    GFP_KERNEL);
 	if (!data)
 		return -ENOMEM;

 	config = i2c_smbus_read_byte_data(client, LM25066_DEVICE_SETUP);
 	if (config < 0)
 		return config;

 	data->id = id->driver_data;
 	info = &data->info;

 	info->pages = 1;
 	info->format[PSC_VOLTAGE_IN] = direct;
 	info->format[PSC_VOLTAGE_OUT] = direct;
 	info->format[PSC_CURRENT_IN] = direct;
 	info->format[PSC_TEMPERATURE] = direct;
 	info->format[PSC_POWER] = direct;

 	info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VMON
 	  | PMBUS_HAVE_PIN | PMBUS_HAVE_IIN | PMBUS_HAVE_STATUS_INPUT
 	  | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;

 	if (data->id == lm25056) {
 		info->func[0] |= PMBUS_HAVE_STATUS_VMON;
 		info->read_word_data = lm25056_read_word_data;
 		info->read_byte_data = lm25056_read_byte_data;
 		data->rlimit = 0x0fff;
 	} else if (data->id == lm25063) {
 		info->func[0] |= PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
 		  | PMBUS_HAVE_POUT;
 		info->read_word_data = lm25063_read_word_data;
 		data->rlimit = 0xffff;
 	} else {
 		info->func[0] |= PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
 		info->read_word_data = lm25066_read_word_data;
 		data->rlimit = 0x0fff;
 	}
 	info->write_word_data = lm25066_write_word_data;

 	coeff = &lm25066_coeff[data->id][0];
 	info->m[PSC_TEMPERATURE] = coeff[PSC_TEMPERATURE].m;
 	info->b[PSC_TEMPERATURE] = coeff[PSC_TEMPERATURE].b;
 	info->R[PSC_TEMPERATURE] = coeff[PSC_TEMPERATURE].R;
 	info->m[PSC_VOLTAGE_IN] = coeff[PSC_VOLTAGE_IN].m;
 	info->b[PSC_VOLTAGE_IN] = coeff[PSC_VOLTAGE_IN].b;
 	info->R[PSC_VOLTAGE_IN] = coeff[PSC_VOLTAGE_IN].R;
 	info->m[PSC_VOLTAGE_OUT] = coeff[PSC_VOLTAGE_OUT].m;
 	info->b[PSC_VOLTAGE_OUT] = coeff[PSC_VOLTAGE_OUT].b;
 	info->R[PSC_VOLTAGE_OUT] = coeff[PSC_VOLTAGE_OUT].R;
 	info->b[PSC_CURRENT_IN] = coeff[PSC_CURRENT_IN].b;
 	info->R[PSC_CURRENT_IN] = coeff[PSC_CURRENT_IN].R;
 	info->b[PSC_POWER] = coeff[PSC_POWER].b;
 	info->R[PSC_POWER] = coeff[PSC_POWER].R;
 	if (config & LM25066_DEV_SETUP_CL) {
 		info->m[PSC_CURRENT_IN] = coeff[PSC_CURRENT_IN_L].m;
 		info->m[PSC_POWER] = coeff[PSC_POWER_L].m;
 	} else {
 		info->m[PSC_CURRENT_IN] = coeff[PSC_CURRENT_IN].m;
 		info->m[PSC_POWER] = coeff[PSC_POWER].m;
 	}

 	return pmbus_do_probe(client, id, info);
 }

 static const struct i2c_device_id lm25066_id[] = {
 	{"lm25056", lm25056},
 	{"lm25063", lm25063},
 	{"lm25066", lm25066},
 	{"lm5064", lm5064},
 	{"lm5066", lm5066},
 	{ }
 };

 MODULE_DEVICE_TABLE(i2c, lm25066_id);

 /* This is the driver that will be inserted */
 static struct i2c_driver lm25066_driver = {
 	.driver = {
 		   .name = "lm25066",
 		   },
 	.probe = lm25066_probe,
 	.remove = pmbus_do_remove,
 	.id_table = lm25066_id,
 };

 module_i2c_driver(lm25066_driver);

 MODULE_AUTHOR("Guenter Roeck");
 MODULE_DESCRIPTION("PMBus driver for LM25066 and compatible chips");
 MODULE_LICENSE("GPL");
	/*
	* Hardware monitoring driver for LM25056 / LM25063 / LM25066 / LM5064 / LM5066
	*
	* Copyright (c) 2011 Ericsson AB.
	* Copyright (c) 2013 Guenter Roeck
	*
	* 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/bitops.h>
	#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 "pmbus.h"

	enum chips { lm25056, lm25063, lm25066, lm5064, lm5066 };

	#define LM25066_READ_VAUX 0xd0
	#define LM25066_MFR_READ_IIN 0xd1
	#define LM25066_MFR_READ_PIN 0xd2
	#define LM25066_MFR_IIN_OC_WARN_LIMIT 0xd3
	#define LM25066_MFR_PIN_OP_WARN_LIMIT 0xd4
	#define LM25066_READ_PIN_PEAK 0xd5
	#define LM25066_CLEAR_PIN_PEAK 0xd6
	#define LM25066_DEVICE_SETUP 0xd9
	#define LM25066_READ_AVG_VIN 0xdc
	#define LM25066_READ_AVG_VOUT 0xdd
	#define LM25066_READ_AVG_IIN 0xde
	#define LM25066_READ_AVG_PIN 0xdf

	#define LM25066_DEV_SETUP_CL BIT(4) /* Current limit */

	/* LM25056 only */

	#define LM25056_VAUX_OV_WARN_LIMIT 0xe3
	#define LM25056_VAUX_UV_WARN_LIMIT 0xe4

	#define LM25056_MFR_STS_VAUX_OV_WARN BIT(1)
	#define LM25056_MFR_STS_VAUX_UV_WARN BIT(0)

	/* LM25063 only */

	#define LM25063_READ_VOUT_MAX 0xe5
	#define LM25063_READ_VOUT_MIN 0xe6

	struct __coeff {
	short m, b, R;
	};

	#define PSC_CURRENT_IN_L (PSC_NUM_CLASSES)
	#define PSC_POWER_L (PSC_NUM_CLASSES + 1)

	static struct __coeff lm25066_coeff[5][PSC_NUM_CLASSES + 2] = {
	[lm25056] = {
	[PSC_VOLTAGE_IN] = {
	.m = 16296,
	.R = -2,
	},
	[PSC_CURRENT_IN] = {
	.m = 13797,
	.R = -2,
	},
	[PSC_CURRENT_IN_L] = {
	.m = 6726,
	.R = -2,
	},
	[PSC_POWER] = {
	.m = 5501,
	.R = -3,
	},
	[PSC_POWER_L] = {
	.m = 26882,
	.R = -4,
	},
	[PSC_TEMPERATURE] = {
	.m = 1580,
	.b = -14500,
	.R = -2,
	},
	},
	[lm25066] = {
	[PSC_VOLTAGE_IN] = {
	.m = 22070,
	.R = -2,
	},
	[PSC_VOLTAGE_OUT] = {
	.m = 22070,
	.R = -2,
	},
	[PSC_CURRENT_IN] = {
	.m = 13661,
	.R = -2,
	},
	[PSC_CURRENT_IN_L] = {
	.m = 6852,
	.R = -2,
	},
	[PSC_POWER] = {
	.m = 736,
	.R = -2,
	},
	[PSC_POWER_L] = {
	.m = 369,
	.R = -2,
	},
	[PSC_TEMPERATURE] = {
	.m = 16,
	},
	},
	[lm25063] = {
	[PSC_VOLTAGE_IN] = {
	.m = 16000,
	.R = -2,
	},
	[PSC_VOLTAGE_OUT] = {
	.m = 16000,
	.R = -2,
	},
	[PSC_CURRENT_IN] = {
	.m = 10000,
	.R = -2,
	},
	[PSC_CURRENT_IN_L] = {
	.m = 10000,
	.R = -2,
	},
	[PSC_POWER] = {
	.m = 5000,
	.R = -3,
	},
	[PSC_POWER_L] = {
	.m = 5000,
	.R = -3,
	},
	[PSC_TEMPERATURE] = {
	.m = 15596,
	.R = -3,
	},
	},
	[lm5064] = {
	[PSC_VOLTAGE_IN] = {
	.m = 4611,
	.R = -2,
	},
	[PSC_VOLTAGE_OUT] = {
	.m = 4621,
	.R = -2,
	},
	[PSC_CURRENT_IN] = {
	.m = 10742,
	.R = -2,
	},
	[PSC_CURRENT_IN_L] = {
	.m = 5456,
	.R = -2,
	},
	[PSC_POWER] = {
	.m = 1204,
	.R = -3,
	},
	[PSC_POWER_L] = {
	.m = 612,
	.R = -3,
	},
	[PSC_TEMPERATURE] = {
	.m = 16,
	},
	},
	[lm5066] = {
	[PSC_VOLTAGE_IN] = {
	.m = 4587,
	.R = -2,
	},
	[PSC_VOLTAGE_OUT] = {
	.m = 4587,
	.R = -2,
	},
	[PSC_CURRENT_IN] = {
	.m = 10753,
	.R = -2,
	},
	[PSC_CURRENT_IN_L] = {
	.m = 5405,
	.R = -2,
	},
	[PSC_POWER] = {
	.m = 1204,
	.R = -3,
	},
	[PSC_POWER_L] = {
	.m = 605,
	.R = -3,
	},
	[PSC_TEMPERATURE] = {
	.m = 16,
	},
	},
	};

	struct lm25066_data {
	int id;
	u16 rlimit; /* Maximum register value */
	struct pmbus_driver_info info;
	};

	#define to_lm25066_data(x) container_of(x, struct lm25066_data, info)

	static int lm25066_read_word_data(struct i2c_client *client, int page, int reg)
	{
	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
	const struct lm25066_data *data = to_lm25066_data(info);
	int ret;

	switch (reg) {
	case PMBUS_VIRT_READ_VMON:
	ret = pmbus_read_word_data(client, 0, LM25066_READ_VAUX);
	if (ret < 0)
	break;
	/* Adjust returned value to match VIN coefficients */
	switch (data->id) {
	case lm25056:
	/* VIN: 6.14 mV VAUX: 293 uV LSB */
	ret = DIV_ROUND_CLOSEST(ret * 293, 6140);
	break;
	case lm25063:
	/* VIN: 6.25 mV VAUX: 200.0 uV LSB */
	ret = DIV_ROUND_CLOSEST(ret * 20, 625);
	break;
	case lm25066:
	/* VIN: 4.54 mV VAUX: 283.2 uV LSB */
	ret = DIV_ROUND_CLOSEST(ret * 2832, 45400);
	break;
	case lm5064:
	/* VIN: 4.53 mV VAUX: 700 uV LSB */
	ret = DIV_ROUND_CLOSEST(ret * 70, 453);
	break;
	case lm5066:
	/* VIN: 2.18 mV VAUX: 725 uV LSB */
	ret = DIV_ROUND_CLOSEST(ret * 725, 2180);
	break;
	}
	break;
	case PMBUS_READ_IIN:
	ret = pmbus_read_word_data(client, 0, LM25066_MFR_READ_IIN);
	break;
	case PMBUS_READ_PIN:
	ret = pmbus_read_word_data(client, 0, LM25066_MFR_READ_PIN);
	break;
	case PMBUS_IIN_OC_WARN_LIMIT:
	ret = pmbus_read_word_data(client, 0,
	LM25066_MFR_IIN_OC_WARN_LIMIT);
	break;
	case PMBUS_PIN_OP_WARN_LIMIT:
	ret = pmbus_read_word_data(client, 0,
	LM25066_MFR_PIN_OP_WARN_LIMIT);
	break;
	case PMBUS_VIRT_READ_VIN_AVG:
	ret = pmbus_read_word_data(client, 0, LM25066_READ_AVG_VIN);
	break;
	case PMBUS_VIRT_READ_VOUT_AVG:
	ret = pmbus_read_word_data(client, 0, LM25066_READ_AVG_VOUT);
	break;
	case PMBUS_VIRT_READ_IIN_AVG:
	ret = pmbus_read_word_data(client, 0, LM25066_READ_AVG_IIN);
	break;
	case PMBUS_VIRT_READ_PIN_AVG:
	ret = pmbus_read_word_data(client, 0, LM25066_READ_AVG_PIN);
	break;
	case PMBUS_VIRT_READ_PIN_MAX:
	ret = pmbus_read_word_data(client, 0, LM25066_READ_PIN_PEAK);
	break;
	case PMBUS_VIRT_RESET_PIN_HISTORY:
	ret = 0;
	break;
	default:
	ret = -ENODATA;
	break;
	}
	return ret;
	}

	static int lm25063_read_word_data(struct i2c_client *client, int page, int reg)
	{
	int ret;

	switch (reg) {
	case PMBUS_VIRT_READ_VOUT_MAX:
	ret = pmbus_read_word_data(client, 0, LM25063_READ_VOUT_MAX);
	break;
	case PMBUS_VIRT_READ_VOUT_MIN:
	ret = pmbus_read_word_data(client, 0, LM25063_READ_VOUT_MIN);
	break;
	default:
	ret = lm25066_read_word_data(client, page, reg);
	break;
	}
	return ret;
	}

	static int lm25056_read_word_data(struct i2c_client *client, int page, int reg)
	{
	int ret;

	switch (reg) {
	case PMBUS_VIRT_VMON_UV_WARN_LIMIT:
	ret = pmbus_read_word_data(client, 0,
	LM25056_VAUX_UV_WARN_LIMIT);
	if (ret < 0)
	break;
	/* Adjust returned value to match VIN coefficients */
	ret = DIV_ROUND_CLOSEST(ret * 293, 6140);
	break;
	case PMBUS_VIRT_VMON_OV_WARN_LIMIT:
	ret = pmbus_read_word_data(client, 0,
	LM25056_VAUX_OV_WARN_LIMIT);
	if (ret < 0)
	break;
	/* Adjust returned value to match VIN coefficients */
	ret = DIV_ROUND_CLOSEST(ret * 293, 6140);
	break;
	default:
	ret = lm25066_read_word_data(client, page, reg);
	break;
	}
	return ret;
	}

	static int lm25056_read_byte_data(struct i2c_client *client, int page, int reg)
	{
	int ret, s;

	switch (reg) {
	case PMBUS_VIRT_STATUS_VMON:
	ret = pmbus_read_byte_data(client, 0,
	PMBUS_STATUS_MFR_SPECIFIC);
	if (ret < 0)
	break;
	s = 0;
	if (ret & LM25056_MFR_STS_VAUX_UV_WARN)
	s \|= PB_VOLTAGE_UV_WARNING;
	if (ret & LM25056_MFR_STS_VAUX_OV_WARN)
	s \|= PB_VOLTAGE_OV_WARNING;
	ret = s;
	break;
	default:
	ret = -ENODATA;
	break;
	}
	return ret;
	}

	static int lm25066_write_word_data(struct i2c_client *client, int page, int reg,
	u16 word)
	{
	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
	const struct lm25066_data *data = to_lm25066_data(info);
	int ret;

	switch (reg) {
	case PMBUS_POUT_OP_FAULT_LIMIT:
	case PMBUS_POUT_OP_WARN_LIMIT:
	case PMBUS_VOUT_UV_WARN_LIMIT:
	case PMBUS_OT_FAULT_LIMIT:
	case PMBUS_OT_WARN_LIMIT:
	case PMBUS_IIN_OC_FAULT_LIMIT:
	case PMBUS_VIN_UV_WARN_LIMIT:
	case PMBUS_VIN_UV_FAULT_LIMIT:
	case PMBUS_VIN_OV_FAULT_LIMIT:
	case PMBUS_VIN_OV_WARN_LIMIT:
	word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit);
	ret = pmbus_write_word_data(client, 0, reg, word);
	pmbus_clear_cache(client);
	break;
	case PMBUS_IIN_OC_WARN_LIMIT:
	word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit);
	ret = pmbus_write_word_data(client, 0,
	LM25066_MFR_IIN_OC_WARN_LIMIT,
	word);
	pmbus_clear_cache(client);
	break;
	case PMBUS_PIN_OP_WARN_LIMIT:
	word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit);
	ret = pmbus_write_word_data(client, 0,
	LM25066_MFR_PIN_OP_WARN_LIMIT,
	word);
	pmbus_clear_cache(client);
	break;
	case PMBUS_VIRT_VMON_UV_WARN_LIMIT:
	/* Adjust from VIN coefficients (for LM25056) */
	word = DIV_ROUND_CLOSEST((int)word * 6140, 293);
	word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit);
	ret = pmbus_write_word_data(client, 0,
	LM25056_VAUX_UV_WARN_LIMIT, word);
	pmbus_clear_cache(client);
	break;
	case PMBUS_VIRT_VMON_OV_WARN_LIMIT:
	/* Adjust from VIN coefficients (for LM25056) */
	word = DIV_ROUND_CLOSEST((int)word * 6140, 293);
	word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit);
	ret = pmbus_write_word_data(client, 0,
	LM25056_VAUX_OV_WARN_LIMIT, word);
	pmbus_clear_cache(client);
	break;
	case PMBUS_VIRT_RESET_PIN_HISTORY:
	ret = pmbus_write_byte(client, 0, LM25066_CLEAR_PIN_PEAK);
	break;
	default:
	ret = -ENODATA;
	break;
	}
	return ret;
	}

	static int lm25066_probe(struct i2c_client *client,
	const struct i2c_device_id *id)
	{
	int config;
	struct lm25066_data *data;
	struct pmbus_driver_info *info;
	struct __coeff *coeff;

	if (!i2c_check_functionality(client->adapter,
	I2C_FUNC_SMBUS_READ_BYTE_DATA))
	return -ENODEV;

	data = devm_kzalloc(&client->dev, sizeof(struct lm25066_data),
	GFP_KERNEL);
	if (!data)
	return -ENOMEM;

	config = i2c_smbus_read_byte_data(client, LM25066_DEVICE_SETUP);
	if (config < 0)
	return config;

	data->id = id->driver_data;
	info = &data->info;

	info->pages = 1;
	info->format[PSC_VOLTAGE_IN] = direct;
	info->format[PSC_VOLTAGE_OUT] = direct;
	info->format[PSC_CURRENT_IN] = direct;
	info->format[PSC_TEMPERATURE] = direct;
	info->format[PSC_POWER] = direct;

	info->func[0] = PMBUS_HAVE_VIN \| PMBUS_HAVE_VMON
	\| PMBUS_HAVE_PIN \| PMBUS_HAVE_IIN \| PMBUS_HAVE_STATUS_INPUT
	\| PMBUS_HAVE_TEMP \| PMBUS_HAVE_STATUS_TEMP;

	if (data->id == lm25056) {
	info->func[0] \|= PMBUS_HAVE_STATUS_VMON;
	info->read_word_data = lm25056_read_word_data;
	info->read_byte_data = lm25056_read_byte_data;
	data->rlimit = 0x0fff;
	} else if (data->id == lm25063) {
	info->func[0] \|= PMBUS_HAVE_VOUT \| PMBUS_HAVE_STATUS_VOUT
	\| PMBUS_HAVE_POUT;
	info->read_word_data = lm25063_read_word_data;
	data->rlimit = 0xffff;
	} else {
	info->func[0] \|= PMBUS_HAVE_VOUT \| PMBUS_HAVE_STATUS_VOUT;
	info->read_word_data = lm25066_read_word_data;
	data->rlimit = 0x0fff;
	}
	info->write_word_data = lm25066_write_word_data;

	coeff = &lm25066_coeff[data->id][0];
	info->m[PSC_TEMPERATURE] = coeff[PSC_TEMPERATURE].m;
	info->b[PSC_TEMPERATURE] = coeff[PSC_TEMPERATURE].b;
	info->R[PSC_TEMPERATURE] = coeff[PSC_TEMPERATURE].R;
	info->m[PSC_VOLTAGE_IN] = coeff[PSC_VOLTAGE_IN].m;
	info->b[PSC_VOLTAGE_IN] = coeff[PSC_VOLTAGE_IN].b;
	info->R[PSC_VOLTAGE_IN] = coeff[PSC_VOLTAGE_IN].R;
	info->m[PSC_VOLTAGE_OUT] = coeff[PSC_VOLTAGE_OUT].m;
	info->b[PSC_VOLTAGE_OUT] = coeff[PSC_VOLTAGE_OUT].b;
	info->R[PSC_VOLTAGE_OUT] = coeff[PSC_VOLTAGE_OUT].R;
	info->b[PSC_CURRENT_IN] = coeff[PSC_CURRENT_IN].b;
	info->R[PSC_CURRENT_IN] = coeff[PSC_CURRENT_IN].R;
	info->b[PSC_POWER] = coeff[PSC_POWER].b;
	info->R[PSC_POWER] = coeff[PSC_POWER].R;
	if (config & LM25066_DEV_SETUP_CL) {
	info->m[PSC_CURRENT_IN] = coeff[PSC_CURRENT_IN_L].m;
	info->m[PSC_POWER] = coeff[PSC_POWER_L].m;
	} else {
	info->m[PSC_CURRENT_IN] = coeff[PSC_CURRENT_IN].m;
	info->m[PSC_POWER] = coeff[PSC_POWER].m;
	}

	return pmbus_do_probe(client, id, info);
	}

	static const struct i2c_device_id lm25066_id[] = {
	{"lm25056", lm25056},
	{"lm25063", lm25063},
	{"lm25066", lm25066},
	{"lm5064", lm5064},
	{"lm5066", lm5066},
	{ }
	};

	MODULE_DEVICE_TABLE(i2c, lm25066_id);

	/* This is the driver that will be inserted */
	static struct i2c_driver lm25066_driver = {
	.driver = {
	.name = "lm25066",
	},
	.probe = lm25066_probe,
	.remove = pmbus_do_remove,
	.id_table = lm25066_id,
	};

	module_i2c_driver(lm25066_driver);

	MODULE_AUTHOR("Guenter Roeck");
	MODULE_DESCRIPTION("PMBus driver for LM25066 and compatible chips");
	MODULE_LICENSE("GPL");