[deliverable/linux.git] / drivers / hwmon / pmbus / adm1275.c

/*
 * Hardware monitoring driver for Analog Devices ADM1275 Hot-Swap Controller
 * and Digital Power Monitor
 *
 * 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.
 */

#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"

#define ADM1275_PEAK_IOUT		0xd0
#define ADM1275_PEAK_VIN		0xd1
#define ADM1275_PEAK_VOUT		0xd2
#define ADM1275_PMON_CONFIG		0xd4

#define ADM1275_VIN_VOUT_SELECT		(1 << 6)
#define ADM1275_VRANGE			(1 << 5)

static int adm1275_read_word_data(struct i2c_client *client, int page, int reg)
{
	int ret;

	if (page)
		return -EINVAL;

	switch (reg) {
	case PMBUS_VIRT_READ_IOUT_MAX:
		ret = pmbus_read_word_data(client, 0, ADM1275_PEAK_IOUT);
		break;
	case PMBUS_VIRT_READ_VOUT_MAX:
		ret = pmbus_read_word_data(client, 0, ADM1275_PEAK_VOUT);
		break;
	case PMBUS_VIRT_READ_VIN_MAX:
		ret = pmbus_read_word_data(client, 0, ADM1275_PEAK_VIN);
		break;
	case PMBUS_VIRT_RESET_IOUT_HISTORY:
	case PMBUS_VIRT_RESET_VOUT_HISTORY:
	case PMBUS_VIRT_RESET_VIN_HISTORY:
		ret = 0;
		break;
	default:
		ret = -ENODATA;
		break;
	}
	return ret;
}

static int adm1275_write_word_data(struct i2c_client *client, int page, int reg,
				   u16 word)
{
	int ret;

	if (page)
		return -EINVAL;

	switch (reg) {
	case PMBUS_VIRT_RESET_IOUT_HISTORY:
		ret = pmbus_write_word_data(client, 0, ADM1275_PEAK_IOUT, 0);
		break;
	case PMBUS_VIRT_RESET_VOUT_HISTORY:
		ret = pmbus_write_word_data(client, 0, ADM1275_PEAK_VOUT, 0);
		break;
	case PMBUS_VIRT_RESET_VIN_HISTORY:
		ret = pmbus_write_word_data(client, 0, ADM1275_PEAK_VIN, 0);
		break;
	default:
		ret = -ENODATA;
		break;
	}
	return ret;
}

static int adm1275_probe(struct i2c_client *client,
			 const struct i2c_device_id *id)
{
	int config;
	int ret;
	struct pmbus_driver_info *info;

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

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

	config = i2c_smbus_read_byte_data(client, ADM1275_PMON_CONFIG);
	if (config < 0) {
		ret = config;
		goto err_mem;
	}

	info->pages = 1;
	info->format[PSC_VOLTAGE_IN] = direct;
	info->format[PSC_VOLTAGE_OUT] = direct;
	info->format[PSC_CURRENT_OUT] = direct;
	info->m[PSC_CURRENT_OUT] = 807;
	info->b[PSC_CURRENT_OUT] = 20475;
	info->R[PSC_CURRENT_OUT] = -1;
	info->func[0] = PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT;

	info->read_word_data = adm1275_read_word_data;
	info->write_word_data = adm1275_write_word_data;

	if (config & ADM1275_VRANGE) {
		info->m[PSC_VOLTAGE_IN] = 19199;
		info->b[PSC_VOLTAGE_IN] = 0;
		info->R[PSC_VOLTAGE_IN] = -2;
		info->m[PSC_VOLTAGE_OUT] = 19199;
		info->b[PSC_VOLTAGE_OUT] = 0;
		info->R[PSC_VOLTAGE_OUT] = -2;
	} else {
		info->m[PSC_VOLTAGE_IN] = 6720;
		info->b[PSC_VOLTAGE_IN] = 0;
		info->R[PSC_VOLTAGE_IN] = -1;
		info->m[PSC_VOLTAGE_OUT] = 6720;
		info->b[PSC_VOLTAGE_OUT] = 0;
		info->R[PSC_VOLTAGE_OUT] = -1;
	}

	if (config & ADM1275_VIN_VOUT_SELECT)
		info->func[0] |= PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
	else
		info->func[0] |= PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT;

	ret = pmbus_do_probe(client, id, info);
	if (ret)
		goto err_mem;
	return 0;

err_mem:
	kfree(info);
	return ret;
}

static int adm1275_remove(struct i2c_client *client)
{
	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
	int ret;

	ret = pmbus_do_remove(client);
	kfree(info);
	return ret;
}

static const struct i2c_device_id adm1275_id[] = {
	{"adm1275", 0},
	{ }
};
MODULE_DEVICE_TABLE(i2c, adm1275_id);

static struct i2c_driver adm1275_driver = {
	.driver = {
		   .name = "adm1275",
		   },
	.probe = adm1275_probe,
	.remove = adm1275_remove,
	.id_table = adm1275_id,
};

static int __init adm1275_init(void)
{
	return i2c_add_driver(&adm1275_driver);
}

static void __exit adm1275_exit(void)
{
	i2c_del_driver(&adm1275_driver);
}

MODULE_AUTHOR("Guenter Roeck");
MODULE_DESCRIPTION("PMBus driver for Analog Devices ADM1275");
MODULE_LICENSE("GPL");
module_init(adm1275_init);
module_exit(adm1275_exit);
Commit	Line	Data
83f7649c GR	1	/*
	2	* Hardware monitoring driver for Analog Devices ADM1275 Hot-Swap Controller
	3	* and Digital Power Monitor
	4	*
	5	* Copyright (c) 2011 Ericsson AB.
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*/
	17
	18	#include <linux/kernel.h>
	19	#include <linux/module.h>
	20	#include <linux/init.h>
	21	#include <linux/err.h>
	22	#include <linux/slab.h>
	23	#include <linux/i2c.h>
	24	#include "pmbus.h"
	25
c576e30c GR	26	#define ADM1275_PEAK_IOUT 0xd0
	27	#define ADM1275_PEAK_VIN 0xd1
	28	#define ADM1275_PEAK_VOUT 0xd2
83f7649c GR	29	#define ADM1275_PMON_CONFIG 0xd4
	30
	31	#define ADM1275_VIN_VOUT_SELECT (1 << 6)
	32	#define ADM1275_VRANGE (1 << 5)
	33
c576e30c GR	34	static int adm1275_read_word_data(struct i2c_client *client, int page, int reg)
	35	{
	36	int ret;
	37
	38	if (page)
	39	return -EINVAL;
	40
	41	switch (reg) {
	42	case PMBUS_VIRT_READ_IOUT_MAX:
	43	ret = pmbus_read_word_data(client, 0, ADM1275_PEAK_IOUT);
	44	break;
	45	case PMBUS_VIRT_READ_VOUT_MAX:
	46	ret = pmbus_read_word_data(client, 0, ADM1275_PEAK_VOUT);
	47	break;
	48	case PMBUS_VIRT_READ_VIN_MAX:
	49	ret = pmbus_read_word_data(client, 0, ADM1275_PEAK_VIN);
	50	break;
	51	case PMBUS_VIRT_RESET_IOUT_HISTORY:
	52	case PMBUS_VIRT_RESET_VOUT_HISTORY:
	53	case PMBUS_VIRT_RESET_VIN_HISTORY:
	54	ret = 0;
	55	break;
	56	default:
	57	ret = -ENODATA;
	58	break;
	59	}
	60	return ret;
	61	}
	62
	63	static int adm1275_write_word_data(struct i2c_client *client, int page, int reg,
	64	u16 word)
	65	{
	66	int ret;
	67
	68	if (page)
	69	return -EINVAL;
	70
	71	switch (reg) {
	72	case PMBUS_VIRT_RESET_IOUT_HISTORY:
	73	ret = pmbus_write_word_data(client, 0, ADM1275_PEAK_IOUT, 0);
	74	break;
	75	case PMBUS_VIRT_RESET_VOUT_HISTORY:
	76	ret = pmbus_write_word_data(client, 0, ADM1275_PEAK_VOUT, 0);
	77	break;
	78	case PMBUS_VIRT_RESET_VIN_HISTORY:
	79	ret = pmbus_write_word_data(client, 0, ADM1275_PEAK_VIN, 0);
	80	break;
	81	default:
	82	ret = -ENODATA;
	83	break;
	84	}
	85	return ret;
	86	}
	87
83f7649c GR	88	static int adm1275_probe(struct i2c_client *client,
	89	const struct i2c_device_id *id)
	90	{
	91	int config;
3b33ca41	92	int ret;
83f7649c GR	93	struct pmbus_driver_info *info;
	94
	95	if (!i2c_check_functionality(client->adapter,
	96	I2C_FUNC_SMBUS_READ_BYTE_DATA))
	97	return -ENODEV;
	98
	99	info = kzalloc(sizeof(struct pmbus_driver_info), GFP_KERNEL);
	100	if (!info)
	101	return -ENOMEM;
	102
	103	config = i2c_smbus_read_byte_data(client, ADM1275_PMON_CONFIG);
3b33ca41 GR	104	if (config < 0) {
	105	ret = config;
	106	goto err_mem;
	107	}
83f7649c GR	108
83f7649c GR	109	info->pages = 1;
1061d851 GR	110	info->format[PSC_VOLTAGE_IN] = direct;
	111	info->format[PSC_VOLTAGE_OUT] = direct;
	112	info->format[PSC_CURRENT_OUT] = direct;
7e97bbba	113	info->m[PSC_CURRENT_OUT] = 807;
83f7649c GR	114	info->b[PSC_CURRENT_OUT] = 20475;
	115	info->R[PSC_CURRENT_OUT] = -1;
	116	info->func[0] = PMBUS_HAVE_IOUT \| PMBUS_HAVE_STATUS_IOUT;
	117
c576e30c GR	118	info->read_word_data = adm1275_read_word_data;
	119	info->write_word_data = adm1275_write_word_data;
	120
83f7649c	121	if (config & ADM1275_VRANGE) {
7e97bbba	122	info->m[PSC_VOLTAGE_IN] = 19199;
83f7649c GR	123	info->b[PSC_VOLTAGE_IN] = 0;
83f7649c GR	124	info->R[PSC_VOLTAGE_IN] = -2;
7e97bbba	125	info->m[PSC_VOLTAGE_OUT] = 19199;
83f7649c GR	126	info->b[PSC_VOLTAGE_OUT] = 0;
	127	info->R[PSC_VOLTAGE_OUT] = -2;
	128	} else {
7e97bbba	129	info->m[PSC_VOLTAGE_IN] = 6720;
83f7649c GR	130	info->b[PSC_VOLTAGE_IN] = 0;
83f7649c GR	131	info->R[PSC_VOLTAGE_IN] = -1;
7e97bbba	132	info->m[PSC_VOLTAGE_OUT] = 6720;
83f7649c GR	133	info->b[PSC_VOLTAGE_OUT] = 0;
	134	info->R[PSC_VOLTAGE_OUT] = -1;
	135	}
	136
	137	if (config & ADM1275_VIN_VOUT_SELECT)
	138	info->func[0] \|= PMBUS_HAVE_VOUT \| PMBUS_HAVE_STATUS_VOUT;
	139	else
	140	info->func[0] \|= PMBUS_HAVE_VIN \| PMBUS_HAVE_STATUS_INPUT;
	141
3b33ca41 GR	142	ret = pmbus_do_probe(client, id, info);
	143	if (ret)
	144	goto err_mem;
	145	return 0;
	146
	147	err_mem:
	148	kfree(info);
	149	return ret;
83f7649c GR	150	}
	151
	152	static int adm1275_remove(struct i2c_client *client)
	153	{
	154	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
	155	int ret;
	156
	157	ret = pmbus_do_remove(client);
	158	kfree(info);
	159	return ret;
	160	}
	161
	162	static const struct i2c_device_id adm1275_id[] = {
	163	{"adm1275", 0},
	164	{ }
	165	};
	166	MODULE_DEVICE_TABLE(i2c, adm1275_id);
	167
	168	static struct i2c_driver adm1275_driver = {
	169	.driver = {
	170	.name = "adm1275",
	171	},
	172	.probe = adm1275_probe,
	173	.remove = adm1275_remove,
	174	.id_table = adm1275_id,
	175	};
	176
	177	static int __init adm1275_init(void)
	178	{
	179	return i2c_add_driver(&adm1275_driver);
	180	}
	181
	182	static void __exit adm1275_exit(void)
	183	{
	184	i2c_del_driver(&adm1275_driver);
	185	}
	186
	187	MODULE_AUTHOR("Guenter Roeck");
	188	MODULE_DESCRIPTION("PMBus driver for Analog Devices ADM1275");
	189	MODULE_LICENSE("GPL");
	190	module_init(adm1275_init);
	191	module_exit(adm1275_exit);