[linux-2.6-block.git] / drivers / hwmon / pmbus / ir35221.c

/*
 * Hardware monitoring driver for IR35221
 *
 * Copyright (C) IBM Corporation 2017.
 *
 * 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.
 */

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

#define IR35221_MFR_VIN_PEAK		0xc5
#define IR35221_MFR_VOUT_PEAK		0xc6
#define IR35221_MFR_IOUT_PEAK		0xc7
#define IR35221_MFR_TEMP_PEAK		0xc8
#define IR35221_MFR_VIN_VALLEY		0xc9
#define IR35221_MFR_VOUT_VALLEY		0xca
#define IR35221_MFR_IOUT_VALLEY		0xcb
#define IR35221_MFR_TEMP_VALLEY		0xcc

static int ir35221_read_word_data(struct i2c_client *client, int page, int reg)
{
	int ret;

	switch (reg) {
	case PMBUS_VIRT_READ_VIN_MAX:
		ret = pmbus_read_word_data(client, page, IR35221_MFR_VIN_PEAK);
		break;
	case PMBUS_VIRT_READ_VOUT_MAX:
		ret = pmbus_read_word_data(client, page, IR35221_MFR_VOUT_PEAK);
		break;
	case PMBUS_VIRT_READ_IOUT_MAX:
		ret = pmbus_read_word_data(client, page, IR35221_MFR_IOUT_PEAK);
		break;
	case PMBUS_VIRT_READ_TEMP_MAX:
		ret = pmbus_read_word_data(client, page, IR35221_MFR_TEMP_PEAK);
		break;
	case PMBUS_VIRT_READ_VIN_MIN:
		ret = pmbus_read_word_data(client, page,
					   IR35221_MFR_VIN_VALLEY);
		break;
	case PMBUS_VIRT_READ_VOUT_MIN:
		ret = pmbus_read_word_data(client, page,
					   IR35221_MFR_VOUT_VALLEY);
		break;
	case PMBUS_VIRT_READ_IOUT_MIN:
		ret = pmbus_read_word_data(client, page,
					   IR35221_MFR_IOUT_VALLEY);
		break;
	case PMBUS_VIRT_READ_TEMP_MIN:
		ret = pmbus_read_word_data(client, page,
					   IR35221_MFR_TEMP_VALLEY);
		break;
	default:
		ret = -ENODATA;
		break;
	}

	return ret;
}

static int ir35221_probe(struct i2c_client *client,
			 const struct i2c_device_id *id)
{
	struct pmbus_driver_info *info;
	u8 buf[I2C_SMBUS_BLOCK_MAX];
	int ret;

	if (!i2c_check_functionality(client->adapter,
				     I2C_FUNC_SMBUS_READ_BYTE_DATA
				| I2C_FUNC_SMBUS_READ_WORD_DATA
				| I2C_FUNC_SMBUS_READ_BLOCK_DATA))
		return -ENODEV;

	ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, buf);
	if (ret < 0) {
		dev_err(&client->dev, "Failed to read PMBUS_MFR_ID\n");
		return ret;
	}
	if (ret != 2 || strncmp(buf, "RI", strlen("RI"))) {
		dev_err(&client->dev, "MFR_ID unrecognised\n");
		return -ENODEV;
	}

	ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf);
	if (ret < 0) {
		dev_err(&client->dev, "Failed to read PMBUS_MFR_MODEL\n");
		return ret;
	}
	if (ret != 2 || !(buf[0] == 0x6c && buf[1] == 0x00)) {
		dev_err(&client->dev, "MFR_MODEL unrecognised\n");
		return -ENODEV;
	}

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

	info->read_word_data = ir35221_read_word_data;

	info->pages = 2;
	info->format[PSC_VOLTAGE_IN] = linear;
	info->format[PSC_VOLTAGE_OUT] = linear;
	info->format[PSC_CURRENT_IN] = linear;
	info->format[PSC_CURRENT_OUT] = linear;
	info->format[PSC_POWER] = linear;
	info->format[PSC_TEMPERATURE] = linear;

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

	return pmbus_do_probe(client, id, info);
}

static const struct i2c_device_id ir35221_id[] = {
	{"ir35221", 0},
	{}
};

MODULE_DEVICE_TABLE(i2c, ir35221_id);

static struct i2c_driver ir35221_driver = {
	.driver = {
		.name	= "ir35221",
	},
	.probe		= ir35221_probe,
	.remove		= pmbus_do_remove,
	.id_table	= ir35221_id,
};

module_i2c_driver(ir35221_driver);

MODULE_AUTHOR("Samuel Mendoza-Jonas <sam@mendozajonas.com");
MODULE_DESCRIPTION("PMBus driver for IR35221");
MODULE_LICENSE("GPL");
Commit	Line	Data
8991ebd9 SMJ	1	/*
	2	* Hardware monitoring driver for IR35221
	3	*
	4	* Copyright (C) IBM Corporation 2017.
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License
	8	* as published by the Free Software Foundation; either version
	9	* 2 of the License, or (at your option) any later version.
	10	*/
	11
	12	#include <linux/err.h>
	13	#include <linux/i2c.h>
	14	#include <linux/init.h>
	15	#include <linux/kernel.h>
	16	#include <linux/module.h>
	17	#include "pmbus.h"
	18
	19	#define IR35221_MFR_VIN_PEAK 0xc5
	20	#define IR35221_MFR_VOUT_PEAK 0xc6
	21	#define IR35221_MFR_IOUT_PEAK 0xc7
	22	#define IR35221_MFR_TEMP_PEAK 0xc8
	23	#define IR35221_MFR_VIN_VALLEY 0xc9
	24	#define IR35221_MFR_VOUT_VALLEY 0xca
	25	#define IR35221_MFR_IOUT_VALLEY 0xcb
	26	#define IR35221_MFR_TEMP_VALLEY 0xcc
	27
8991ebd9 SMJ	28	static int ir35221_read_word_data(struct i2c_client *client, int page, int reg)
	29	{
	30	int ret;
	31
	32	switch (reg) {
8991ebd9 SMJ	33	case PMBUS_VIRT_READ_VIN_MAX:
8991ebd9 SMJ	34	ret = pmbus_read_word_data(client, page, IR35221_MFR_VIN_PEAK);
8991ebd9 SMJ	35	break;
	36	case PMBUS_VIRT_READ_VOUT_MAX:
	37	ret = pmbus_read_word_data(client, page, IR35221_MFR_VOUT_PEAK);
	38	break;
	39	case PMBUS_VIRT_READ_IOUT_MAX:
	40	ret = pmbus_read_word_data(client, page, IR35221_MFR_IOUT_PEAK);
8991ebd9 SMJ	41	break;
	42	case PMBUS_VIRT_READ_TEMP_MAX:
	43	ret = pmbus_read_word_data(client, page, IR35221_MFR_TEMP_PEAK);
	44	break;
	45	case PMBUS_VIRT_READ_VIN_MIN:
	46	ret = pmbus_read_word_data(client, page,
	47	IR35221_MFR_VIN_VALLEY);
8991ebd9 SMJ	48	break;
	49	case PMBUS_VIRT_READ_VOUT_MIN:
	50	ret = pmbus_read_word_data(client, page,
	51	IR35221_MFR_VOUT_VALLEY);
	52	break;
	53	case PMBUS_VIRT_READ_IOUT_MIN:
	54	ret = pmbus_read_word_data(client, page,
	55	IR35221_MFR_IOUT_VALLEY);
8991ebd9 SMJ	56	break;
	57	case PMBUS_VIRT_READ_TEMP_MIN:
	58	ret = pmbus_read_word_data(client, page,
	59	IR35221_MFR_TEMP_VALLEY);
	60	break;
	61	default:
	62	ret = -ENODATA;
	63	break;
	64	}
	65
	66	return ret;
	67	}
	68
8991ebd9 SMJ	69	static int ir35221_probe(struct i2c_client *client,
	70	const struct i2c_device_id *id)
	71	{
	72	struct pmbus_driver_info *info;
	73	u8 buf[I2C_SMBUS_BLOCK_MAX];
	74	int ret;
	75
	76	if (!i2c_check_functionality(client->adapter,
	77	I2C_FUNC_SMBUS_READ_BYTE_DATA
	78	\| I2C_FUNC_SMBUS_READ_WORD_DATA
	79	\| I2C_FUNC_SMBUS_READ_BLOCK_DATA))
	80	return -ENODEV;
	81
	82	ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, buf);
	83	if (ret < 0) {
	84	dev_err(&client->dev, "Failed to read PMBUS_MFR_ID\n");
	85	return ret;
	86	}
	87	if (ret != 2 \|\| strncmp(buf, "RI", strlen("RI"))) {
	88	dev_err(&client->dev, "MFR_ID unrecognised\n");
	89	return -ENODEV;
	90	}
	91
	92	ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf);
	93	if (ret < 0) {
	94	dev_err(&client->dev, "Failed to read PMBUS_MFR_MODEL\n");
	95	return ret;
	96	}
	97	if (ret != 2 \|\| !(buf[0] == 0x6c && buf[1] == 0x00)) {
	98	dev_err(&client->dev, "MFR_MODEL unrecognised\n");
	99	return -ENODEV;
	100	}
	101
	102	info = devm_kzalloc(&client->dev, sizeof(struct pmbus_driver_info),
	103	GFP_KERNEL);
	104	if (!info)
	105	return -ENOMEM;
	106
8991ebd9 SMJ	107	info->read_word_data = ir35221_read_word_data;
	108
	109	info->pages = 2;
	110	info->format[PSC_VOLTAGE_IN] = linear;
	111	info->format[PSC_VOLTAGE_OUT] = linear;
	112	info->format[PSC_CURRENT_IN] = linear;
	113	info->format[PSC_CURRENT_OUT] = linear;
	114	info->format[PSC_POWER] = linear;
	115	info->format[PSC_TEMPERATURE] = linear;
	116
	117	info->func[0] = PMBUS_HAVE_VIN
	118	\| PMBUS_HAVE_VOUT \| PMBUS_HAVE_IIN
	119	\| PMBUS_HAVE_IOUT \| PMBUS_HAVE_PIN
	120	\| PMBUS_HAVE_POUT \| PMBUS_HAVE_TEMP
	121	\| PMBUS_HAVE_STATUS_VOUT \| PMBUS_HAVE_STATUS_IOUT
	122	\| PMBUS_HAVE_STATUS_INPUT \| PMBUS_HAVE_STATUS_TEMP;
	123	info->func[1] = info->func[0];
	124
	125	return pmbus_do_probe(client, id, info);
	126	}
	127
	128	static const struct i2c_device_id ir35221_id[] = {
	129	{"ir35221", 0},
	130	{}
	131	};
	132
	133	MODULE_DEVICE_TABLE(i2c, ir35221_id);
	134
	135	static struct i2c_driver ir35221_driver = {
	136	.driver = {
	137	.name = "ir35221",
	138	},
	139	.probe = ir35221_probe,
	140	.remove = pmbus_do_remove,
	141	.id_table = ir35221_id,
	142	};
	143
	144	module_i2c_driver(ir35221_driver);
	145
	146	MODULE_AUTHOR("Samuel Mendoza-Jonas <sam@mendozajonas.com");
	147	MODULE_DESCRIPTION("PMBus driver for IR35221");
	148	MODULE_LICENSE("GPL");