[mirror_ubuntu-artful-kernel.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/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		(1 << 4)
#define MAX8688_STATUS_OV_FAULT		(1 << 5)
#define MAX8688_STATUS_OV_WARNING	(1 << 8)
#define MAX8688_STATUS_UV_FAULT		(1 << 9)
#define MAX8688_STATUS_UV_WARNING	(1 << 10)
#define MAX8688_STATUS_UC_FAULT		(1 << 11)
#define MAX8688_STATUS_OC_WARNING	(1 << 12)
#define MAX8688_STATUS_OT_FAULT		(1 << 13)
#define MAX8688_STATUS_OT_WARNING	(1 << 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 int max8688_remove(struct i2c_client *client)
{
	pmbus_do_remove(client);
	return 0;
}

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 = max8688_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
	21	#include <linux/kernel.h>
	22	#include <linux/module.h>
	23	#include <linux/init.h>
	24	#include <linux/err.h>
	25	#include <linux/i2c.h>
	26	#include "pmbus.h"
	27
70e94b27 GR	28	#define MAX8688_MFR_VOUT_PEAK 0xd4
	29	#define MAX8688_MFR_IOUT_PEAK 0xd5
	30	#define MAX8688_MFR_TEMPERATURE_PEAK 0xd6
8ea3238b GR	31	#define MAX8688_MFG_STATUS 0xd8
	32
	33	#define MAX8688_STATUS_OC_FAULT (1 << 4)
	34	#define MAX8688_STATUS_OV_FAULT (1 << 5)
	35	#define MAX8688_STATUS_OV_WARNING (1 << 8)
	36	#define MAX8688_STATUS_UV_FAULT (1 << 9)
	37	#define MAX8688_STATUS_UV_WARNING (1 << 10)
	38	#define MAX8688_STATUS_UC_FAULT (1 << 11)
	39	#define MAX8688_STATUS_OC_WARNING (1 << 12)
	40	#define MAX8688_STATUS_OT_FAULT (1 << 13)
	41	#define MAX8688_STATUS_OT_WARNING (1 << 14)
	42
70e94b27 GR	43	static int max8688_read_word_data(struct i2c_client *client, int page, int reg)
	44	{
	45	int ret;
	46
	47	if (page)
179144a0	48	return -ENXIO;
70e94b27 GR	49
	50	switch (reg) {
	51	case PMBUS_VIRT_READ_VOUT_MAX:
	52	ret = pmbus_read_word_data(client, 0, MAX8688_MFR_VOUT_PEAK);
	53	break;
	54	case PMBUS_VIRT_READ_IOUT_MAX:
	55	ret = pmbus_read_word_data(client, 0, MAX8688_MFR_IOUT_PEAK);
	56	break;
	57	case PMBUS_VIRT_READ_TEMP_MAX:
	58	ret = pmbus_read_word_data(client, 0,
	59	MAX8688_MFR_TEMPERATURE_PEAK);
	60	break;
	61	case PMBUS_VIRT_RESET_VOUT_HISTORY:
	62	case PMBUS_VIRT_RESET_IOUT_HISTORY:
	63	case PMBUS_VIRT_RESET_TEMP_HISTORY:
	64	ret = 0;
	65	break;
	66	default:
	67	ret = -ENODATA;
	68	break;
	69	}
	70	return ret;
	71	}
	72
	73	static int max8688_write_word_data(struct i2c_client *client, int page, int reg,
	74	u16 word)
	75	{
	76	int ret;
	77
	78	switch (reg) {
	79	case PMBUS_VIRT_RESET_VOUT_HISTORY:
	80	ret = pmbus_write_word_data(client, 0, MAX8688_MFR_VOUT_PEAK,
	81	0);
	82	break;
	83	case PMBUS_VIRT_RESET_IOUT_HISTORY:
	84	ret = pmbus_write_word_data(client, 0, MAX8688_MFR_IOUT_PEAK,
	85	0);
	86	break;
	87	case PMBUS_VIRT_RESET_TEMP_HISTORY:
	88	ret = pmbus_write_word_data(client, 0,
	89	MAX8688_MFR_TEMPERATURE_PEAK,
	90	0xffff);
	91	break;
	92	default:
	93	ret = -ENODATA;
	94	break;
	95	}
	96	return ret;
	97	}
	98
2cfa6aed	99	static int max8688_read_byte_data(struct i2c_client *client, int page, int reg)
8ea3238b GR	100	{
	101	int ret = 0;
	102	int mfg_status;
	103
da8e48ab	104	if (page > 0)
179144a0	105	return -ENXIO;
8ea3238b GR	106
	107	switch (reg) {
	108	case PMBUS_STATUS_VOUT:
	109	mfg_status = pmbus_read_word_data(client, 0,
	110	MAX8688_MFG_STATUS);
	111	if (mfg_status < 0)
	112	return mfg_status;
	113	if (mfg_status & MAX8688_STATUS_UV_WARNING)
	114	ret \|= PB_VOLTAGE_UV_WARNING;
	115	if (mfg_status & MAX8688_STATUS_UV_FAULT)
	116	ret \|= PB_VOLTAGE_UV_FAULT;
	117	if (mfg_status & MAX8688_STATUS_OV_WARNING)
	118	ret \|= PB_VOLTAGE_OV_WARNING;
	119	if (mfg_status & MAX8688_STATUS_OV_FAULT)
	120	ret \|= PB_VOLTAGE_OV_FAULT;
	121	break;
	122	case PMBUS_STATUS_IOUT:
	123	mfg_status = pmbus_read_word_data(client, 0,
	124	MAX8688_MFG_STATUS);
	125	if (mfg_status < 0)
	126	return mfg_status;
	127	if (mfg_status & MAX8688_STATUS_UC_FAULT)
	128	ret \|= PB_IOUT_UC_FAULT;
	129	if (mfg_status & MAX8688_STATUS_OC_WARNING)
	130	ret \|= PB_IOUT_OC_WARNING;
	131	if (mfg_status & MAX8688_STATUS_OC_FAULT)
	132	ret \|= PB_IOUT_OC_FAULT;
	133	break;
	134	case PMBUS_STATUS_TEMPERATURE:
	135	mfg_status = pmbus_read_word_data(client, 0,
	136	MAX8688_MFG_STATUS);
	137	if (mfg_status < 0)
	138	return mfg_status;
	139	if (mfg_status & MAX8688_STATUS_OT_WARNING)
	140	ret \|= PB_TEMP_OT_WARNING;
	141	if (mfg_status & MAX8688_STATUS_OT_FAULT)
	142	ret \|= PB_TEMP_OT_FAULT;
	143	break;
	144	default:
	145	ret = -ENODATA;
	146	break;
	147	}
	148	return ret;
	149	}
	150
	151	static struct pmbus_driver_info max8688_info = {
	152	.pages = 1,
1061d851 GR	153	.format[PSC_VOLTAGE_IN] = direct,
	154	.format[PSC_VOLTAGE_OUT] = direct,
	155	.format[PSC_TEMPERATURE] = direct,
	156	.format[PSC_CURRENT_OUT] = direct,
8ea3238b GR	157	.m[PSC_VOLTAGE_IN] = 19995,
	158	.b[PSC_VOLTAGE_IN] = 0,
	159	.R[PSC_VOLTAGE_IN] = -1,
	160	.m[PSC_VOLTAGE_OUT] = 19995,
	161	.b[PSC_VOLTAGE_OUT] = 0,
	162	.R[PSC_VOLTAGE_OUT] = -1,
	163	.m[PSC_CURRENT_OUT] = 23109,
	164	.b[PSC_CURRENT_OUT] = 0,
	165	.R[PSC_CURRENT_OUT] = -2,
	166	.m[PSC_TEMPERATURE] = -7612,
	167	.b[PSC_TEMPERATURE] = 335,
	168	.R[PSC_TEMPERATURE] = -3,
	169	.func[0] = PMBUS_HAVE_VOUT \| PMBUS_HAVE_IOUT \| PMBUS_HAVE_TEMP
	170	\| PMBUS_HAVE_STATUS_VOUT \| PMBUS_HAVE_STATUS_IOUT
	171	\| PMBUS_HAVE_STATUS_TEMP,
2cfa6aed	172	.read_byte_data = max8688_read_byte_data,
70e94b27 GR	173	.read_word_data = max8688_read_word_data,
70e94b27 GR	174	.write_word_data = max8688_write_word_data,
8ea3238b GR	175	};
	176
	177	static int max8688_probe(struct i2c_client *client,
	178	const struct i2c_device_id *id)
	179	{
	180	return pmbus_do_probe(client, id, &max8688_info);
	181	}
	182
	183	static int max8688_remove(struct i2c_client *client)
	184	{
866cf12a GR	185	pmbus_do_remove(client);
866cf12a GR	186	return 0;
8ea3238b GR	187	}
	188
	189	static const struct i2c_device_id max8688_id[] = {
	190	{"max8688", 0},
	191	{ }
	192	};
	193
	194	MODULE_DEVICE_TABLE(i2c, max8688_id);
	195
	196	/* This is the driver that will be inserted */
	197	static struct i2c_driver max8688_driver = {
	198	.driver = {
	199	.name = "max8688",
	200	},
	201	.probe = max8688_probe,
	202	.remove = max8688_remove,
	203	.id_table = max8688_id,
	204	};
	205
f0967eea	206	module_i2c_driver(max8688_driver);
8ea3238b GR	207
	208	MODULE_AUTHOR("Guenter Roeck");
	209	MODULE_DESCRIPTION("PMBus driver for Maxim MAX8688");
	210	MODULE_LICENSE("GPL");