[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/init.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/i2c/pmbus.h>
#include "pmbus.h"

enum chips { ucd9000, ucd90120, ucd90124, 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},
	{"ucd9090", ucd9090},
	{"ucd90910", ucd90910},
	{}
};
MODULE_DEVICE_TABLE(i2c, ucd9000_id);

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

	data = kzalloc(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");
		goto out;
	}
	info->pages = ret;
	if (!info->pages) {
		dev_err(&client->dev, "No pages configured\n");
		ret = -ENODEV;
		goto out;
	}

	/* 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");
		ret = -ENODEV;
		goto out;
	}
	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)
				goto out;
		}
		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;
	}

	ret = pmbus_do_probe(client, mid, info);
	if (ret < 0)
		goto out;
	return 0;

out:
	kfree(data);
	return ret;
}

static int ucd9000_remove(struct i2c_client *client)
{
	struct ucd9000_data *data;

	data = to_ucd9000_data(pmbus_get_driver_info(client));
	pmbus_do_remove(client);
	kfree(data);
	return 0;
}


/* This is the driver that will be inserted */
static struct i2c_driver ucd9000_driver = {
	.driver = {
		.name = "ucd9000",
	},
	.probe = ucd9000_probe,
	.remove = ucd9000_remove,
	.id_table = ucd9000_id,
};

static int __init ucd9000_init(void)
{
	return i2c_add_driver(&ucd9000_driver);
}

static void __exit ucd9000_exit(void)
{
	i2c_del_driver(&ucd9000_driver);
}

MODULE_AUTHOR("Guenter Roeck");
MODULE_DESCRIPTION("PMBus driver for TI UCD90xxx");
MODULE_LICENSE("GPL");
module_init(ucd9000_init);
module_exit(ucd9000_exit);
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>
	24	#include <linux/init.h>
	25	#include <linux/err.h>
	26	#include <linux/slab.h>
	27	#include <linux/i2c.h>
	28	#include <linux/i2c/pmbus.h>
	29	#include "pmbus.h"
	30
	31	enum chips { ucd9000, ucd90120, ucd90124, ucd9090, ucd90910 };
	32
	33	#define UCD9000_MONITOR_CONFIG 0xd5
	34	#define UCD9000_NUM_PAGES 0xd6
	35	#define UCD9000_FAN_CONFIG_INDEX 0xe7
	36	#define UCD9000_FAN_CONFIG 0xe8
	37	#define UCD9000_DEVICE_ID 0xfd
	38
	39	#define UCD9000_MON_TYPE(x) (((x) >> 5) & 0x07)
	40	#define UCD9000_MON_PAGE(x) ((x) & 0x0f)
	41
	42	#define UCD9000_MON_VOLTAGE 1
	43	#define UCD9000_MON_TEMPERATURE 2
	44	#define UCD9000_MON_CURRENT 3
	45	#define UCD9000_MON_VOLTAGE_HW 4
	46
	47	#define UCD9000_NUM_FAN 4
	48
	49	struct ucd9000_data {
	50	u8 fan_data[UCD9000_NUM_FAN][I2C_SMBUS_BLOCK_MAX];
	51	struct pmbus_driver_info info;
	52	};
	53	#define to_ucd9000_data(_info) container_of(_info, struct ucd9000_data, info)
	54
	55	static int ucd9000_get_fan_config(struct i2c_client *client, int fan)
	56	{
	57	int fan_config = 0;
	58	struct ucd9000_data *data
	59	= to_ucd9000_data(pmbus_get_driver_info(client));
	60
	61	if (data->fan_data[fan][3] & 1)
	62	fan_config \|= PB_FAN_2_INSTALLED; /* Use lower bit position */
	63
	64	/* Pulses/revolution */
65	fan_config \|= (data->fan_data[fan][3] & 0x06) >> 1;
66
67	return fan_config;
68	}
69
70	static int ucd9000_read_byte_data(struct i2c_client *client, int page, int reg)
71	{
72	int ret = 0;
73	int fan_config;
74
75	switch (reg) {
76	case PMBUS_FAN_CONFIG_12:
da8e48ab	77	if (page > 0)
179144a0	78	return -ENXIO;
0c0a0615 GR	79
	80	ret = ucd9000_get_fan_config(client, 0);
	81	if (ret < 0)
	82	return ret;
	83	fan_config = ret << 4;
	84	ret = ucd9000_get_fan_config(client, 1);
	85	if (ret < 0)
	86	return ret;
	87	fan_config \|= ret;
	88	ret = fan_config;
	89	break;
	90	case PMBUS_FAN_CONFIG_34:
da8e48ab	91	if (page > 0)
179144a0	92	return -ENXIO;
0c0a0615 GR	93
	94	ret = ucd9000_get_fan_config(client, 2);
	95	if (ret < 0)
	96	return ret;
	97	fan_config = ret << 4;
	98	ret = ucd9000_get_fan_config(client, 3);
	99	if (ret < 0)
	100	return ret;
	101	fan_config \|= ret;
	102	ret = fan_config;
	103	break;
	104	default:
	105	ret = -ENODATA;
	106	break;
	107	}
	108	return ret;
	109	}
	110
	111	static const struct i2c_device_id ucd9000_id[] = {
	112	{"ucd9000", ucd9000},
	113	{"ucd90120", ucd90120},
	114	{"ucd90124", ucd90124},
	115	{"ucd9090", ucd9090},
	116	{"ucd90910", ucd90910},
	117	{}
	118	};
	119	MODULE_DEVICE_TABLE(i2c, ucd9000_id);
	120
	121	static int ucd9000_probe(struct i2c_client *client,
	122	const struct i2c_device_id *id)
	123	{
	124	u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1];
	125	struct ucd9000_data *data;
	126	struct pmbus_driver_info *info;
	127	const struct i2c_device_id *mid;
	128	int i, ret;
	129
	130	if (!i2c_check_functionality(client->adapter,
	131	I2C_FUNC_SMBUS_BYTE_DATA \|
	132	I2C_FUNC_SMBUS_BLOCK_DATA))
	133	return -ENODEV;
	134
	135	ret = i2c_smbus_read_block_data(client, UCD9000_DEVICE_ID,
	136	block_buffer);
	137	if (ret < 0) {
	138	dev_err(&client->dev, "Failed to read device ID\n");
	139	return ret;
	140	}
	141	block_buffer[ret] = '\0';
	142	dev_info(&client->dev, "Device ID %s\n", block_buffer);
	143
f020b007	144	for (mid = ucd9000_id; mid->name[0]; mid++) {
0c0a0615 GR	145	if (!strncasecmp(mid->name, block_buffer, strlen(mid->name)))
	146	break;
	147	}
f020b007	148	if (!mid->name[0]) {
0c0a0615 GR	149	dev_err(&client->dev, "Unsupported device\n");
	150	return -ENODEV;
	151	}
	152
	153	if (id->driver_data != ucd9000 && id->driver_data != mid->driver_data)
	154	dev_notice(&client->dev,
	155	"Device mismatch: Configured %s, detected %s\n",
	156	id->name, mid->name);
	157
	158	data = kzalloc(sizeof(struct ucd9000_data), GFP_KERNEL);
	159	if (!data)
	160	return -ENOMEM;
	161	info = &data->info;
	162
	163	ret = i2c_smbus_read_byte_data(client, UCD9000_NUM_PAGES);
	164	if (ret < 0) {
	165	dev_err(&client->dev,
	166	"Failed to read number of active pages\n");
	167	goto out;
	168	}
	169	info->pages = ret;
	170	if (!info->pages) {
	171	dev_err(&client->dev, "No pages configured\n");
	172	ret = -ENODEV;
	173	goto out;
	174	}
	175
	176	/* The internal temperature sensor is always active */
	177	info->func[0] = PMBUS_HAVE_TEMP;
	178
	179	/* Everything else is configurable */
	180	ret = i2c_smbus_read_block_data(client, UCD9000_MONITOR_CONFIG,
	181	block_buffer);
	182	if (ret <= 0) {
	183	dev_err(&client->dev, "Failed to read configuration data\n");
	184	ret = -ENODEV;
	185	goto out;
	186	}
	187	for (i = 0; i < ret; i++) {
	188	int page = UCD9000_MON_PAGE(block_buffer[i]);
	189
	190	if (page >= info->pages)
	191	continue;
	192
	193	switch (UCD9000_MON_TYPE(block_buffer[i])) {
	194	case UCD9000_MON_VOLTAGE:
	195	case UCD9000_MON_VOLTAGE_HW:
	196	info->func[page] \|= PMBUS_HAVE_VOUT
	197	\| PMBUS_HAVE_STATUS_VOUT;
	198	break;
	199	case UCD9000_MON_TEMPERATURE:
	200	info->func[page] \|= PMBUS_HAVE_TEMP2
	201	\| PMBUS_HAVE_STATUS_TEMP;
	202	break;
	203	case UCD9000_MON_CURRENT:
	204	info->func[page] \|= PMBUS_HAVE_IOUT
	205	\| PMBUS_HAVE_STATUS_IOUT;
	206	break;
	207	default:
	208	break;
	209	}
	210	}
	211
	212	/* Fan configuration */
213	if (mid->driver_data == ucd90124) {
214	for (i = 0; i < UCD9000_NUM_FAN; i++) {
215	i2c_smbus_write_byte_data(client,
216	UCD9000_FAN_CONFIG_INDEX, i);
217	ret = i2c_smbus_read_block_data(client,
218	UCD9000_FAN_CONFIG,
219	data->fan_data[i]);
220	if (ret < 0)
221	goto out;
222	}
223	i2c_smbus_write_byte_data(client, UCD9000_FAN_CONFIG_INDEX, 0);
224
225	info->read_byte_data = ucd9000_read_byte_data;
226	info->func[0] \|= PMBUS_HAVE_FAN12 \| PMBUS_HAVE_STATUS_FAN12
227	\| PMBUS_HAVE_FAN34 \| PMBUS_HAVE_STATUS_FAN34;
228	}
229
230	ret = pmbus_do_probe(client, mid, info);
231	if (ret < 0)
232	goto out;
233	return 0;
234
235	out:
236	kfree(data);
237	return ret;
238	}
239
240	static int ucd9000_remove(struct i2c_client *client)
241	{
0c0a0615 GR	242	struct ucd9000_data *data;
	243
	244	data = to_ucd9000_data(pmbus_get_driver_info(client));
866cf12a	245	pmbus_do_remove(client);
0c0a0615	246	kfree(data);
866cf12a	247	return 0;
0c0a0615 GR	248	}
	249
	250
	251	/* This is the driver that will be inserted */
	252	static struct i2c_driver ucd9000_driver = {
	253	.driver = {
	254	.name = "ucd9000",
	255	},
	256	.probe = ucd9000_probe,
	257	.remove = ucd9000_remove,
	258	.id_table = ucd9000_id,
	259	};
	260
	261	static int __init ucd9000_init(void)
	262	{
	263	return i2c_add_driver(&ucd9000_driver);
	264	}
	265
	266	static void __exit ucd9000_exit(void)
	267	{
	268	i2c_del_driver(&ucd9000_driver);
	269	}
	270
	271	MODULE_AUTHOR("Guenter Roeck");
	272	MODULE_DESCRIPTION("PMBus driver for TI UCD90xxx");
	273	MODULE_LICENSE("GPL");
	274	module_init(ucd9000_init);
	275	module_exit(ucd9000_exit);