[linux.git] / drivers / hwmon / pmbus / ucd9000.c

/*
 * Hardware monitoring driver for UCD90xxx Sequencer and System Health
 * Controller series
 *
 * 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/of_device.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/pmbus.h>
#include "pmbus.h"

enum chips { ucd9000, ucd90120, ucd90124, ucd90160, ucd9090, ucd90910 };

#define UCD9000_MONITOR_CONFIG		0xd5
#define UCD9000_NUM_PAGES		0xd6
#define UCD9000_FAN_CONFIG_INDEX	0xe7
#define UCD9000_FAN_CONFIG		0xe8
#define UCD9000_DEVICE_ID		0xfd

#define UCD9000_MON_TYPE(x)	(((x) >> 5) & 0x07)
#define UCD9000_MON_PAGE(x)	((x) & 0x0f)

#define UCD9000_MON_VOLTAGE	1
#define UCD9000_MON_TEMPERATURE	2
#define UCD9000_MON_CURRENT	3
#define UCD9000_MON_VOLTAGE_HW	4

#define UCD9000_NUM_FAN		4

struct ucd9000_data {
	u8 fan_data[UCD9000_NUM_FAN][I2C_SMBUS_BLOCK_MAX];
	struct pmbus_driver_info info;
};
#define to_ucd9000_data(_info) container_of(_info, struct ucd9000_data, info)

static int ucd9000_get_fan_config(struct i2c_client *client, int fan)
{
	int fan_config = 0;
	struct ucd9000_data *data
	  = to_ucd9000_data(pmbus_get_driver_info(client));

	if (data->fan_data[fan][3] & 1)
		fan_config |= PB_FAN_2_INSTALLED;   /* Use lower bit position */

	/* Pulses/revolution */
	fan_config |= (data->fan_data[fan][3] & 0x06) >> 1;

	return fan_config;
}

static int ucd9000_read_byte_data(struct i2c_client *client, int page, int reg)
{
	int ret = 0;
	int fan_config;

	switch (reg) {
	case PMBUS_FAN_CONFIG_12:
		if (page > 0)
			return -ENXIO;

		ret = ucd9000_get_fan_config(client, 0);
		if (ret < 0)
			return ret;
		fan_config = ret << 4;
		ret = ucd9000_get_fan_config(client, 1);
		if (ret < 0)
			return ret;
		fan_config |= ret;
		ret = fan_config;
		break;
	case PMBUS_FAN_CONFIG_34:
		if (page > 0)
			return -ENXIO;

		ret = ucd9000_get_fan_config(client, 2);
		if (ret < 0)
			return ret;
		fan_config = ret << 4;
		ret = ucd9000_get_fan_config(client, 3);
		if (ret < 0)
			return ret;
		fan_config |= ret;
		ret = fan_config;
		break;
	default:
		ret = -ENODATA;
		break;
	}
	return ret;
}

static const struct i2c_device_id ucd9000_id[] = {
	{"ucd9000", ucd9000},
	{"ucd90120", ucd90120},
	{"ucd90124", ucd90124},
	{"ucd90160", ucd90160},
	{"ucd9090", ucd9090},
	{"ucd90910", ucd90910},
	{}
};
MODULE_DEVICE_TABLE(i2c, ucd9000_id);

static const struct of_device_id ucd9000_of_match[] = {
	{
		.compatible = "ti,ucd9000",
		.data = (void *)ucd9000
	},
	{
		.compatible = "ti,ucd90120",
		.data = (void *)ucd90120
	},
	{
		.compatible = "ti,ucd90124",
		.data = (void *)ucd90124
	},
	{
		.compatible = "ti,ucd90160",
		.data = (void *)ucd90160
	},
	{
		.compatible = "ti,ucd9090",
		.data = (void *)ucd9090
	},
	{
		.compatible = "ti,ucd90910",
		.data = (void *)ucd90910
	},
	{ },
};
MODULE_DEVICE_TABLE(of, ucd9000_of_match);

static int ucd9000_probe(struct i2c_client *client,
			 const struct i2c_device_id *id)
{
	u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1];
	struct ucd9000_data *data;
	struct pmbus_driver_info *info;
	const struct i2c_device_id *mid;
	enum chips chip;
	int i, ret;

	if (!i2c_check_functionality(client->adapter,
				     I2C_FUNC_SMBUS_BYTE_DATA |
				     I2C_FUNC_SMBUS_BLOCK_DATA))
		return -ENODEV;

	ret = i2c_smbus_read_block_data(client, UCD9000_DEVICE_ID,
					block_buffer);
	if (ret < 0) {
		dev_err(&client->dev, "Failed to read device ID\n");
		return ret;
	}
	block_buffer[ret] = '\0';
	dev_info(&client->dev, "Device ID %s\n", block_buffer);

	for (mid = ucd9000_id; mid->name[0]; mid++) {
		if (!strncasecmp(mid->name, block_buffer, strlen(mid->name)))
			break;
	}
	if (!mid->name[0]) {
		dev_err(&client->dev, "Unsupported device\n");
		return -ENODEV;
	}

	if (client->dev.of_node)
		chip = (enum chips)of_device_get_match_data(&client->dev);
	else
		chip = id->driver_data;

	if (chip != ucd9000 && chip != mid->driver_data)
		dev_notice(&client->dev,
			   "Device mismatch: Configured %s, detected %s\n",
			   id->name, mid->name);

	data = devm_kzalloc(&client->dev, sizeof(struct ucd9000_data),
			    GFP_KERNEL);
	if (!data)
		return -ENOMEM;
	info = &data->info;

	ret = i2c_smbus_read_byte_data(client, UCD9000_NUM_PAGES);
	if (ret < 0) {
		dev_err(&client->dev,
			"Failed to read number of active pages\n");
		return ret;
	}
	info->pages = ret;
	if (!info->pages) {
		dev_err(&client->dev, "No pages configured\n");
		return -ENODEV;
	}

	/* The internal temperature sensor is always active */
	info->func[0] = PMBUS_HAVE_TEMP;

	/* Everything else is configurable */
	ret = i2c_smbus_read_block_data(client, UCD9000_MONITOR_CONFIG,
					block_buffer);
	if (ret <= 0) {
		dev_err(&client->dev, "Failed to read configuration data\n");
		return -ENODEV;
	}
	for (i = 0; i < ret; i++) {
		int page = UCD9000_MON_PAGE(block_buffer[i]);

		if (page >= info->pages)
			continue;

		switch (UCD9000_MON_TYPE(block_buffer[i])) {
		case UCD9000_MON_VOLTAGE:
		case UCD9000_MON_VOLTAGE_HW:
			info->func[page] |= PMBUS_HAVE_VOUT
			  | PMBUS_HAVE_STATUS_VOUT;
			break;
		case UCD9000_MON_TEMPERATURE:
			info->func[page] |= PMBUS_HAVE_TEMP2
			  | PMBUS_HAVE_STATUS_TEMP;
			break;
		case UCD9000_MON_CURRENT:
			info->func[page] |= PMBUS_HAVE_IOUT
			  | PMBUS_HAVE_STATUS_IOUT;
			break;
		default:
			break;
		}
	}

	/* Fan configuration */
	if (mid->driver_data == ucd90124) {
		for (i = 0; i < UCD9000_NUM_FAN; i++) {
			i2c_smbus_write_byte_data(client,
						  UCD9000_FAN_CONFIG_INDEX, i);
			ret = i2c_smbus_read_block_data(client,
							UCD9000_FAN_CONFIG,
							data->fan_data[i]);
			if (ret < 0)
				return ret;
		}
		i2c_smbus_write_byte_data(client, UCD9000_FAN_CONFIG_INDEX, 0);

		info->read_byte_data = ucd9000_read_byte_data;
		info->func[0] |= PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12
		  | PMBUS_HAVE_FAN34 | PMBUS_HAVE_STATUS_FAN34;
	}

	return pmbus_do_probe(client, mid, info);
}

/* This is the driver that will be inserted */
static struct i2c_driver ucd9000_driver = {
	.driver = {
		.name = "ucd9000",
		.of_match_table = of_match_ptr(ucd9000_of_match),
	},
	.probe = ucd9000_probe,
	.remove = pmbus_do_remove,
	.id_table = ucd9000_id,
};

module_i2c_driver(ucd9000_driver);

MODULE_AUTHOR("Guenter Roeck");
MODULE_DESCRIPTION("PMBus driver for TI UCD90xxx");
MODULE_LICENSE("GPL");
Commit	Line	Data
0c0a0615 GR	1	/*
	2	* Hardware monitoring driver for UCD90xxx Sequencer and System Health
	3	* Controller series
	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	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	20	*/
	21
	22	#include <linux/kernel.h>
	23	#include <linux/module.h>
8881a191	24	#include <linux/of_device.h>
0c0a0615 GR	25	#include <linux/init.h>
	26	#include <linux/err.h>
	27	#include <linux/slab.h>
	28	#include <linux/i2c.h>
4ba1bb12	29	#include <linux/pmbus.h>
0c0a0615 GR	30	#include "pmbus.h"
0c0a0615 GR	31
50b2b02c	32	enum chips { ucd9000, ucd90120, ucd90124, ucd90160, ucd9090, ucd90910 };
0c0a0615 GR	33
	34	#define UCD9000_MONITOR_CONFIG 0xd5
	35	#define UCD9000_NUM_PAGES 0xd6
	36	#define UCD9000_FAN_CONFIG_INDEX 0xe7
	37	#define UCD9000_FAN_CONFIG 0xe8
	38	#define UCD9000_DEVICE_ID 0xfd
	39
	40	#define UCD9000_MON_TYPE(x) (((x) >> 5) & 0x07)
	41	#define UCD9000_MON_PAGE(x) ((x) & 0x0f)
	42
	43	#define UCD9000_MON_VOLTAGE 1
	44	#define UCD9000_MON_TEMPERATURE 2
	45	#define UCD9000_MON_CURRENT 3
	46	#define UCD9000_MON_VOLTAGE_HW 4
	47
	48	#define UCD9000_NUM_FAN 4
	49
	50	struct ucd9000_data {
	51	u8 fan_data[UCD9000_NUM_FAN][I2C_SMBUS_BLOCK_MAX];
	52	struct pmbus_driver_info info;
	53	};
	54	#define to_ucd9000_data(_info) container_of(_info, struct ucd9000_data, info)
	55
	56	static int ucd9000_get_fan_config(struct i2c_client *client, int fan)
	57	{
	58	int fan_config = 0;
	59	struct ucd9000_data *data
	60	= to_ucd9000_data(pmbus_get_driver_info(client));
	61
	62	if (data->fan_data[fan][3] & 1)
	63	fan_config \|= PB_FAN_2_INSTALLED; /* Use lower bit position */
	64
	65	/* Pulses/revolution */
	66	fan_config \|= (data->fan_data[fan][3] & 0x06) >> 1;
	67
	68	return fan_config;
	69	}
	70
	71	static int ucd9000_read_byte_data(struct i2c_client *client, int page, int reg)
	72	{
	73	int ret = 0;
	74	int fan_config;
	75
	76	switch (reg) {
	77	case PMBUS_FAN_CONFIG_12:
da8e48ab	78	if (page > 0)
179144a0	79	return -ENXIO;
0c0a0615 GR	80
	81	ret = ucd9000_get_fan_config(client, 0);
	82	if (ret < 0)
	83	return ret;
	84	fan_config = ret << 4;
	85	ret = ucd9000_get_fan_config(client, 1);
	86	if (ret < 0)
	87	return ret;
	88	fan_config \|= ret;
	89	ret = fan_config;
	90	break;
	91	case PMBUS_FAN_CONFIG_34:
da8e48ab	92	if (page > 0)
179144a0	93	return -ENXIO;
0c0a0615 GR	94
	95	ret = ucd9000_get_fan_config(client, 2);
	96	if (ret < 0)
	97	return ret;
	98	fan_config = ret << 4;
	99	ret = ucd9000_get_fan_config(client, 3);
	100	if (ret < 0)
	101	return ret;
	102	fan_config \|= ret;
	103	ret = fan_config;
	104	break;
	105	default:
	106	ret = -ENODATA;
	107	break;
	108	}
	109	return ret;
	110	}
	111
	112	static const struct i2c_device_id ucd9000_id[] = {
	113	{"ucd9000", ucd9000},
	114	{"ucd90120", ucd90120},
	115	{"ucd90124", ucd90124},
50b2b02c	116	{"ucd90160", ucd90160},
0c0a0615 GR	117	{"ucd9090", ucd9090},
	118	{"ucd90910", ucd90910},
	119	{}
	120	};
	121	MODULE_DEVICE_TABLE(i2c, ucd9000_id);
	122
8881a191 JMC	123	static const struct of_device_id ucd9000_of_match[] = {
	124	{
	125	.compatible = "ti,ucd9000",
	126	.data = (void *)ucd9000
	127	},
	128	{
	129	.compatible = "ti,ucd90120",
	130	.data = (void *)ucd90120
	131	},
	132	{
	133	.compatible = "ti,ucd90124",
	134	.data = (void *)ucd90124
	135	},
	136	{
	137	.compatible = "ti,ucd90160",
	138	.data = (void *)ucd90160
	139	},
	140	{
	141	.compatible = "ti,ucd9090",
	142	.data = (void *)ucd9090
	143	},
	144	{
	145	.compatible = "ti,ucd90910",
	146	.data = (void *)ucd90910
	147	},
	148	{ },
	149	};
	150	MODULE_DEVICE_TABLE(of, ucd9000_of_match);
	151
0c0a0615 GR	152	static int ucd9000_probe(struct i2c_client *client,
	153	const struct i2c_device_id *id)
	154	{
	155	u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1];
	156	struct ucd9000_data *data;
	157	struct pmbus_driver_info *info;
	158	const struct i2c_device_id *mid;
8881a191	159	enum chips chip;
0c0a0615 GR	160	int i, ret;
	161
	162	if (!i2c_check_functionality(client->adapter,
	163	I2C_FUNC_SMBUS_BYTE_DATA \|
	164	I2C_FUNC_SMBUS_BLOCK_DATA))
	165	return -ENODEV;
	166
	167	ret = i2c_smbus_read_block_data(client, UCD9000_DEVICE_ID,
	168	block_buffer);
	169	if (ret < 0) {
	170	dev_err(&client->dev, "Failed to read device ID\n");
	171	return ret;
	172	}
	173	block_buffer[ret] = '\0';
	174	dev_info(&client->dev, "Device ID %s\n", block_buffer);
	175
f020b007	176	for (mid = ucd9000_id; mid->name[0]; mid++) {
0c0a0615 GR	177	if (!strncasecmp(mid->name, block_buffer, strlen(mid->name)))
	178	break;
	179	}
f020b007	180	if (!mid->name[0]) {
0c0a0615 GR	181	dev_err(&client->dev, "Unsupported device\n");
	182	return -ENODEV;
	183	}
	184
8881a191 JMC	185	if (client->dev.of_node)
	186	chip = (enum chips)of_device_get_match_data(&client->dev);
	187	else
	188	chip = id->driver_data;
	189
	190	if (chip != ucd9000 && chip != mid->driver_data)
0c0a0615 GR	191	dev_notice(&client->dev,
	192	"Device mismatch: Configured %s, detected %s\n",
	193	id->name, mid->name);
	194
8b313ca7 GR	195	data = devm_kzalloc(&client->dev, sizeof(struct ucd9000_data),
8b313ca7 GR	196	GFP_KERNEL);
0c0a0615 GR	197	if (!data)
	198	return -ENOMEM;
	199	info = &data->info;
	200
	201	ret = i2c_smbus_read_byte_data(client, UCD9000_NUM_PAGES);
	202	if (ret < 0) {
	203	dev_err(&client->dev,
	204	"Failed to read number of active pages\n");
8b313ca7	205	return ret;
0c0a0615 GR	206	}
	207	info->pages = ret;
	208	if (!info->pages) {
	209	dev_err(&client->dev, "No pages configured\n");
8b313ca7	210	return -ENODEV;
0c0a0615 GR	211	}
	212
	213	/* The internal temperature sensor is always active */
	214	info->func[0] = PMBUS_HAVE_TEMP;
	215
	216	/* Everything else is configurable */
	217	ret = i2c_smbus_read_block_data(client, UCD9000_MONITOR_CONFIG,
	218	block_buffer);
	219	if (ret <= 0) {
	220	dev_err(&client->dev, "Failed to read configuration data\n");
8b313ca7	221	return -ENODEV;
0c0a0615 GR	222	}
	223	for (i = 0; i < ret; i++) {
	224	int page = UCD9000_MON_PAGE(block_buffer[i]);
	225
	226	if (page >= info->pages)
	227	continue;
	228
	229	switch (UCD9000_MON_TYPE(block_buffer[i])) {
	230	case UCD9000_MON_VOLTAGE:
	231	case UCD9000_MON_VOLTAGE_HW:
	232	info->func[page] \|= PMBUS_HAVE_VOUT
	233	\| PMBUS_HAVE_STATUS_VOUT;
	234	break;
	235	case UCD9000_MON_TEMPERATURE:
	236	info->func[page] \|= PMBUS_HAVE_TEMP2
	237	\| PMBUS_HAVE_STATUS_TEMP;
	238	break;
	239	case UCD9000_MON_CURRENT:
	240	info->func[page] \|= PMBUS_HAVE_IOUT
	241	\| PMBUS_HAVE_STATUS_IOUT;
	242	break;
	243	default:
	244	break;
	245	}
	246	}
	247
	248	/* Fan configuration */
	249	if (mid->driver_data == ucd90124) {
	250	for (i = 0; i < UCD9000_NUM_FAN; i++) {
	251	i2c_smbus_write_byte_data(client,
	252	UCD9000_FAN_CONFIG_INDEX, i);
	253	ret = i2c_smbus_read_block_data(client,
	254	UCD9000_FAN_CONFIG,
	255	data->fan_data[i]);
	256	if (ret < 0)
8b313ca7	257	return ret;
0c0a0615 GR	258	}
	259	i2c_smbus_write_byte_data(client, UCD9000_FAN_CONFIG_INDEX, 0);
	260
	261	info->read_byte_data = ucd9000_read_byte_data;
	262	info->func[0] \|= PMBUS_HAVE_FAN12 \| PMBUS_HAVE_STATUS_FAN12
	263	\| PMBUS_HAVE_FAN34 \| PMBUS_HAVE_STATUS_FAN34;
	264	}
	265
8b313ca7	266	return pmbus_do_probe(client, mid, info);
0c0a0615 GR	267	}
0c0a0615 GR	268
0c0a0615 GR	269	/* This is the driver that will be inserted */
	270	static struct i2c_driver ucd9000_driver = {
	271	.driver = {
	272	.name = "ucd9000",
8881a191	273	.of_match_table = of_match_ptr(ucd9000_of_match),
0c0a0615 GR	274	},
0c0a0615 GR	275	.probe = ucd9000_probe,
dd285ad7	276	.remove = pmbus_do_remove,
0c0a0615 GR	277	.id_table = ucd9000_id,
	278	};
	279
f0967eea	280	module_i2c_driver(ucd9000_driver);
0c0a0615 GR	281
	282	MODULE_AUTHOR("Guenter Roeck");
	283	MODULE_DESCRIPTION("PMBus driver for TI UCD90xxx");
	284	MODULE_LICENSE("GPL");