[deliverable/linux.git] / drivers / hwmon / pmbus / max8688.c

/*
 * Hardware monitoring driver for Maxim MAX8688
 *
 * 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/bitops.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include "pmbus.h"

#define MAX8688_MFR_VOUT_PEAK		0xd4
#define MAX8688_MFR_IOUT_PEAK		0xd5
#define MAX8688_MFR_TEMPERATURE_PEAK	0xd6
#define MAX8688_MFG_STATUS		0xd8

#define MAX8688_STATUS_OC_FAULT		BIT(4)
#define MAX8688_STATUS_OV_FAULT		BIT(5)
#define MAX8688_STATUS_OV_WARNING	BIT(8)
#define MAX8688_STATUS_UV_FAULT		BIT(9)
#define MAX8688_STATUS_UV_WARNING	BIT(10)
#define MAX8688_STATUS_UC_FAULT		BIT(11)
#define MAX8688_STATUS_OC_WARNING	BIT(12)
#define MAX8688_STATUS_OT_FAULT		BIT(13)
#define MAX8688_STATUS_OT_WARNING	BIT(14)

static int max8688_read_word_data(struct i2c_client *client, int page, int reg)
{
	int ret;

	if (page)
		return -ENXIO;

	switch (reg) {
	case PMBUS_VIRT_READ_VOUT_MAX:
		ret = pmbus_read_word_data(client, 0, MAX8688_MFR_VOUT_PEAK);
		break;
	case PMBUS_VIRT_READ_IOUT_MAX:
		ret = pmbus_read_word_data(client, 0, MAX8688_MFR_IOUT_PEAK);
		break;
	case PMBUS_VIRT_READ_TEMP_MAX:
		ret = pmbus_read_word_data(client, 0,
					   MAX8688_MFR_TEMPERATURE_PEAK);
		break;
	case PMBUS_VIRT_RESET_VOUT_HISTORY:
	case PMBUS_VIRT_RESET_IOUT_HISTORY:
	case PMBUS_VIRT_RESET_TEMP_HISTORY:
		ret = 0;
		break;
	default:
		ret = -ENODATA;
		break;
	}
	return ret;
}

static int max8688_write_word_data(struct i2c_client *client, int page, int reg,
				   u16 word)
{
	int ret;

	switch (reg) {
	case PMBUS_VIRT_RESET_VOUT_HISTORY:
		ret = pmbus_write_word_data(client, 0, MAX8688_MFR_VOUT_PEAK,
					    0);
		break;
	case PMBUS_VIRT_RESET_IOUT_HISTORY:
		ret = pmbus_write_word_data(client, 0, MAX8688_MFR_IOUT_PEAK,
					    0);
		break;
	case PMBUS_VIRT_RESET_TEMP_HISTORY:
		ret = pmbus_write_word_data(client, 0,
					    MAX8688_MFR_TEMPERATURE_PEAK,
					    0xffff);
		break;
	default:
		ret = -ENODATA;
		break;
	}
	return ret;
}

static int max8688_read_byte_data(struct i2c_client *client, int page, int reg)
{
	int ret = 0;
	int mfg_status;

	if (page > 0)
		return -ENXIO;

	switch (reg) {
	case PMBUS_STATUS_VOUT:
		mfg_status = pmbus_read_word_data(client, 0,
						  MAX8688_MFG_STATUS);
		if (mfg_status < 0)
			return mfg_status;
		if (mfg_status & MAX8688_STATUS_UV_WARNING)
			ret |= PB_VOLTAGE_UV_WARNING;
		if (mfg_status & MAX8688_STATUS_UV_FAULT)
			ret |= PB_VOLTAGE_UV_FAULT;
		if (mfg_status & MAX8688_STATUS_OV_WARNING)
			ret |= PB_VOLTAGE_OV_WARNING;
		if (mfg_status & MAX8688_STATUS_OV_FAULT)
			ret |= PB_VOLTAGE_OV_FAULT;
		break;
	case PMBUS_STATUS_IOUT:
		mfg_status = pmbus_read_word_data(client, 0,
						  MAX8688_MFG_STATUS);
		if (mfg_status < 0)
			return mfg_status;
		if (mfg_status & MAX8688_STATUS_UC_FAULT)
			ret |= PB_IOUT_UC_FAULT;
		if (mfg_status & MAX8688_STATUS_OC_WARNING)
			ret |= PB_IOUT_OC_WARNING;
		if (mfg_status & MAX8688_STATUS_OC_FAULT)
			ret |= PB_IOUT_OC_FAULT;
		break;
	case PMBUS_STATUS_TEMPERATURE:
		mfg_status = pmbus_read_word_data(client, 0,
						  MAX8688_MFG_STATUS);
		if (mfg_status < 0)
			return mfg_status;
		if (mfg_status & MAX8688_STATUS_OT_WARNING)
			ret |= PB_TEMP_OT_WARNING;
		if (mfg_status & MAX8688_STATUS_OT_FAULT)
			ret |= PB_TEMP_OT_FAULT;
		break;
	default:
		ret = -ENODATA;
		break;
	}
	return ret;
}

static struct pmbus_driver_info max8688_info = {
	.pages = 1,
	.format[PSC_VOLTAGE_IN] = direct,
	.format[PSC_VOLTAGE_OUT] = direct,
	.format[PSC_TEMPERATURE] = direct,
	.format[PSC_CURRENT_OUT] = direct,
	.m[PSC_VOLTAGE_IN] = 19995,
	.b[PSC_VOLTAGE_IN] = 0,
	.R[PSC_VOLTAGE_IN] = -1,
	.m[PSC_VOLTAGE_OUT] = 19995,
	.b[PSC_VOLTAGE_OUT] = 0,
	.R[PSC_VOLTAGE_OUT] = -1,
	.m[PSC_CURRENT_OUT] = 23109,
	.b[PSC_CURRENT_OUT] = 0,
	.R[PSC_CURRENT_OUT] = -2,
	.m[PSC_TEMPERATURE] = -7612,
	.b[PSC_TEMPERATURE] = 335,
	.R[PSC_TEMPERATURE] = -3,
	.func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT | PMBUS_HAVE_TEMP
		| PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT
		| PMBUS_HAVE_STATUS_TEMP,
	.read_byte_data = max8688_read_byte_data,
	.read_word_data = max8688_read_word_data,
	.write_word_data = max8688_write_word_data,
};

static int max8688_probe(struct i2c_client *client,
			 const struct i2c_device_id *id)
{
	return pmbus_do_probe(client, id, &max8688_info);
}

static const struct i2c_device_id max8688_id[] = {
	{"max8688", 0},
	{ }
};

MODULE_DEVICE_TABLE(i2c, max8688_id);

/* This is the driver that will be inserted */
static struct i2c_driver max8688_driver = {
	.driver = {
		   .name = "max8688",
		   },
	.probe = max8688_probe,
	.remove = pmbus_do_remove,
	.id_table = max8688_id,
};

module_i2c_driver(max8688_driver);

MODULE_AUTHOR("Guenter Roeck");
MODULE_DESCRIPTION("PMBus driver for Maxim MAX8688");
MODULE_LICENSE("GPL");
Commit	Line	Data
8ea3238b GR	1	/*
	2	* Hardware monitoring driver for Maxim MAX8688
	3	*
	4	* Copyright (c) 2011 Ericsson AB.
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	19	*/
	20
2c052d42	21	#include <linux/bitops.h>
8ea3238b GR	22	#include <linux/kernel.h>
	23	#include <linux/module.h>
	24	#include <linux/init.h>
	25	#include <linux/err.h>
	26	#include <linux/i2c.h>
	27	#include "pmbus.h"
	28
70e94b27 GR	29	#define MAX8688_MFR_VOUT_PEAK 0xd4
	30	#define MAX8688_MFR_IOUT_PEAK 0xd5
	31	#define MAX8688_MFR_TEMPERATURE_PEAK 0xd6
8ea3238b GR	32	#define MAX8688_MFG_STATUS 0xd8
8ea3238b GR	33
2c052d42 GR	34	#define MAX8688_STATUS_OC_FAULT BIT(4)
	35	#define MAX8688_STATUS_OV_FAULT BIT(5)
	36	#define MAX8688_STATUS_OV_WARNING BIT(8)
	37	#define MAX8688_STATUS_UV_FAULT BIT(9)
	38	#define MAX8688_STATUS_UV_WARNING BIT(10)
	39	#define MAX8688_STATUS_UC_FAULT BIT(11)
	40	#define MAX8688_STATUS_OC_WARNING BIT(12)
	41	#define MAX8688_STATUS_OT_FAULT BIT(13)
	42	#define MAX8688_STATUS_OT_WARNING BIT(14)
8ea3238b	43
70e94b27 GR	44	static int max8688_read_word_data(struct i2c_client *client, int page, int reg)
	45	{
	46	int ret;
	47
	48	if (page)
179144a0	49	return -ENXIO;
70e94b27 GR	50
	51	switch (reg) {
	52	case PMBUS_VIRT_READ_VOUT_MAX:
	53	ret = pmbus_read_word_data(client, 0, MAX8688_MFR_VOUT_PEAK);
	54	break;
	55	case PMBUS_VIRT_READ_IOUT_MAX:
	56	ret = pmbus_read_word_data(client, 0, MAX8688_MFR_IOUT_PEAK);
	57	break;
	58	case PMBUS_VIRT_READ_TEMP_MAX:
	59	ret = pmbus_read_word_data(client, 0,
	60	MAX8688_MFR_TEMPERATURE_PEAK);
	61	break;
	62	case PMBUS_VIRT_RESET_VOUT_HISTORY:
	63	case PMBUS_VIRT_RESET_IOUT_HISTORY:
	64	case PMBUS_VIRT_RESET_TEMP_HISTORY:
	65	ret = 0;
	66	break;
	67	default:
	68	ret = -ENODATA;
	69	break;
	70	}
	71	return ret;
	72	}
	73
	74	static int max8688_write_word_data(struct i2c_client *client, int page, int reg,
	75	u16 word)
	76	{
	77	int ret;
	78
	79	switch (reg) {
	80	case PMBUS_VIRT_RESET_VOUT_HISTORY:
	81	ret = pmbus_write_word_data(client, 0, MAX8688_MFR_VOUT_PEAK,
	82	0);
	83	break;
	84	case PMBUS_VIRT_RESET_IOUT_HISTORY:
	85	ret = pmbus_write_word_data(client, 0, MAX8688_MFR_IOUT_PEAK,
	86	0);
	87	break;
	88	case PMBUS_VIRT_RESET_TEMP_HISTORY:
	89	ret = pmbus_write_word_data(client, 0,
	90	MAX8688_MFR_TEMPERATURE_PEAK,
	91	0xffff);
	92	break;
	93	default:
	94	ret = -ENODATA;
	95	break;
	96	}
	97	return ret;
	98	}
	99
2cfa6aed	100	static int max8688_read_byte_data(struct i2c_client *client, int page, int reg)
8ea3238b GR	101	{
	102	int ret = 0;
	103	int mfg_status;
	104
da8e48ab	105	if (page > 0)
179144a0	106	return -ENXIO;
8ea3238b GR	107
	108	switch (reg) {
	109	case PMBUS_STATUS_VOUT:
	110	mfg_status = pmbus_read_word_data(client, 0,
	111	MAX8688_MFG_STATUS);
	112	if (mfg_status < 0)
	113	return mfg_status;
	114	if (mfg_status & MAX8688_STATUS_UV_WARNING)
	115	ret \|= PB_VOLTAGE_UV_WARNING;
	116	if (mfg_status & MAX8688_STATUS_UV_FAULT)
	117	ret \|= PB_VOLTAGE_UV_FAULT;
	118	if (mfg_status & MAX8688_STATUS_OV_WARNING)
	119	ret \|= PB_VOLTAGE_OV_WARNING;
	120	if (mfg_status & MAX8688_STATUS_OV_FAULT)
	121	ret \|= PB_VOLTAGE_OV_FAULT;
	122	break;
	123	case PMBUS_STATUS_IOUT:
	124	mfg_status = pmbus_read_word_data(client, 0,
	125	MAX8688_MFG_STATUS);
	126	if (mfg_status < 0)
	127	return mfg_status;
	128	if (mfg_status & MAX8688_STATUS_UC_FAULT)
	129	ret \|= PB_IOUT_UC_FAULT;
	130	if (mfg_status & MAX8688_STATUS_OC_WARNING)
	131	ret \|= PB_IOUT_OC_WARNING;
	132	if (mfg_status & MAX8688_STATUS_OC_FAULT)
	133	ret \|= PB_IOUT_OC_FAULT;
	134	break;
	135	case PMBUS_STATUS_TEMPERATURE:
	136	mfg_status = pmbus_read_word_data(client, 0,
	137	MAX8688_MFG_STATUS);
	138	if (mfg_status < 0)
	139	return mfg_status;
	140	if (mfg_status & MAX8688_STATUS_OT_WARNING)
	141	ret \|= PB_TEMP_OT_WARNING;
	142	if (mfg_status & MAX8688_STATUS_OT_FAULT)
	143	ret \|= PB_TEMP_OT_FAULT;
	144	break;
	145	default:
	146	ret = -ENODATA;
	147	break;
	148	}
	149	return ret;
	150	}
	151
	152	static struct pmbus_driver_info max8688_info = {
	153	.pages = 1,
1061d851 GR	154	.format[PSC_VOLTAGE_IN] = direct,
	155	.format[PSC_VOLTAGE_OUT] = direct,
	156	.format[PSC_TEMPERATURE] = direct,
	157	.format[PSC_CURRENT_OUT] = direct,
8ea3238b GR	158	.m[PSC_VOLTAGE_IN] = 19995,
	159	.b[PSC_VOLTAGE_IN] = 0,
	160	.R[PSC_VOLTAGE_IN] = -1,
	161	.m[PSC_VOLTAGE_OUT] = 19995,
	162	.b[PSC_VOLTAGE_OUT] = 0,
	163	.R[PSC_VOLTAGE_OUT] = -1,
	164	.m[PSC_CURRENT_OUT] = 23109,
	165	.b[PSC_CURRENT_OUT] = 0,
	166	.R[PSC_CURRENT_OUT] = -2,
	167	.m[PSC_TEMPERATURE] = -7612,
	168	.b[PSC_TEMPERATURE] = 335,
	169	.R[PSC_TEMPERATURE] = -3,
	170	.func[0] = PMBUS_HAVE_VOUT \| PMBUS_HAVE_IOUT \| PMBUS_HAVE_TEMP
	171	\| PMBUS_HAVE_STATUS_VOUT \| PMBUS_HAVE_STATUS_IOUT
	172	\| PMBUS_HAVE_STATUS_TEMP,
2cfa6aed	173	.read_byte_data = max8688_read_byte_data,
70e94b27 GR	174	.read_word_data = max8688_read_word_data,
70e94b27 GR	175	.write_word_data = max8688_write_word_data,
8ea3238b GR	176	};
	177
	178	static int max8688_probe(struct i2c_client *client,
	179	const struct i2c_device_id *id)
	180	{
	181	return pmbus_do_probe(client, id, &max8688_info);
	182	}
	183
8ea3238b GR	184	static const struct i2c_device_id max8688_id[] = {
	185	{"max8688", 0},
	186	{ }
	187	};
	188
	189	MODULE_DEVICE_TABLE(i2c, max8688_id);
	190
	191	/* This is the driver that will be inserted */
	192	static struct i2c_driver max8688_driver = {
	193	.driver = {
	194	.name = "max8688",
	195	},
	196	.probe = max8688_probe,
dd285ad7	197	.remove = pmbus_do_remove,
8ea3238b GR	198	.id_table = max8688_id,
	199	};
	200
f0967eea	201	module_i2c_driver(max8688_driver);
8ea3238b GR	202
	203	MODULE_AUTHOR("Guenter Roeck");
	204	MODULE_DESCRIPTION("PMBus driver for Maxim MAX8688");
	205	MODULE_LICENSE("GPL");