[deliverable/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)
			return -EINVAL;

		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)
			return -EINVAL;

		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);

	mid = NULL;
	for (i = 0; i < ARRAY_SIZE(ucd9000_id); i++) {
		mid = &ucd9000_id[i];
		if (!strncasecmp(mid->name, block_buffer, strlen(mid->name)))
			break;
	}
	if (!mid || !strlen(mid->name)) {
		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)
{
	int ret;
	struct ucd9000_data *data;

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


/* 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:
77	if (page)
78	return -EINVAL;
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:
91	if (page)
92	return -EINVAL;
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
144	mid = NULL;
145	for (i = 0; i < ARRAY_SIZE(ucd9000_id); i++) {
146	mid = &ucd9000_id[i];
147	if (!strncasecmp(mid->name, block_buffer, strlen(mid->name)))
148	break;
149	}
150	if (!mid \|\| !strlen(mid->name)) {
151	dev_err(&client->dev, "Unsupported device\n");
152	return -ENODEV;
153	}
154
155	if (id->driver_data != ucd9000 && id->driver_data != mid->driver_data)
156	dev_notice(&client->dev,
157	"Device mismatch: Configured %s, detected %s\n",
158	id->name, mid->name);
159
160	data = kzalloc(sizeof(struct ucd9000_data), GFP_KERNEL);
161	if (!data)
162	return -ENOMEM;
163	info = &data->info;
164
165	ret = i2c_smbus_read_byte_data(client, UCD9000_NUM_PAGES);
166	if (ret < 0) {
167	dev_err(&client->dev,
168	"Failed to read number of active pages\n");
169	goto out;
170	}
171	info->pages = ret;
172	if (!info->pages) {
173	dev_err(&client->dev, "No pages configured\n");
174	ret = -ENODEV;
175	goto out;
176	}
177
178	/* The internal temperature sensor is always active */
179	info->func[0] = PMBUS_HAVE_TEMP;
180
181	/* Everything else is configurable */
182	ret = i2c_smbus_read_block_data(client, UCD9000_MONITOR_CONFIG,
183	block_buffer);
184	if (ret <= 0) {
185	dev_err(&client->dev, "Failed to read configuration data\n");
186	ret = -ENODEV;
187	goto out;
188	}
189	for (i = 0; i < ret; i++) {
190	int page = UCD9000_MON_PAGE(block_buffer[i]);
191
192	if (page >= info->pages)
193	continue;
194
195	switch (UCD9000_MON_TYPE(block_buffer[i])) {
196	case UCD9000_MON_VOLTAGE:
197	case UCD9000_MON_VOLTAGE_HW:
198	info->func[page] \|= PMBUS_HAVE_VOUT
199	\| PMBUS_HAVE_STATUS_VOUT;
200	break;
201	case UCD9000_MON_TEMPERATURE:
202	info->func[page] \|= PMBUS_HAVE_TEMP2
203	\| PMBUS_HAVE_STATUS_TEMP;
204	break;
205	case UCD9000_MON_CURRENT:
206	info->func[page] \|= PMBUS_HAVE_IOUT
207	\| PMBUS_HAVE_STATUS_IOUT;
208	break;
209	default:
210	break;
211	}
212	}
213
214	/* Fan configuration */
215	if (mid->driver_data == ucd90124) {
216	for (i = 0; i < UCD9000_NUM_FAN; i++) {
217	i2c_smbus_write_byte_data(client,
218	UCD9000_FAN_CONFIG_INDEX, i);
219	ret = i2c_smbus_read_block_data(client,
220	UCD9000_FAN_CONFIG,
221	data->fan_data[i]);
222	if (ret < 0)
223	goto out;
224	}
225	i2c_smbus_write_byte_data(client, UCD9000_FAN_CONFIG_INDEX, 0);
226
227	info->read_byte_data = ucd9000_read_byte_data;
228	info->func[0] \|= PMBUS_HAVE_FAN12 \| PMBUS_HAVE_STATUS_FAN12
229	\| PMBUS_HAVE_FAN34 \| PMBUS_HAVE_STATUS_FAN34;
230	}
231
232	ret = pmbus_do_probe(client, mid, info);
233	if (ret < 0)
234	goto out;
235	return 0;
236
237	out:
238	kfree(data);
239	return ret;
240	}
241
242	static int ucd9000_remove(struct i2c_client *client)
243	{
244	int ret;
245	struct ucd9000_data *data;
246
247	data = to_ucd9000_data(pmbus_get_driver_info(client));
248	ret = pmbus_do_remove(client);
249	kfree(data);
250	return ret;
251	}
252
253
254	/* This is the driver that will be inserted */
255	static struct i2c_driver ucd9000_driver = {
256	.driver = {
257	.name = "ucd9000",
258	},
259	.probe = ucd9000_probe,
260	.remove = ucd9000_remove,
261	.id_table = ucd9000_id,
262	};
263
264	static int __init ucd9000_init(void)
265	{
266	return i2c_add_driver(&ucd9000_driver);
267	}
268
269	static void __exit ucd9000_exit(void)
270	{
271	i2c_del_driver(&ucd9000_driver);
272	}
273
274	MODULE_AUTHOR("Guenter Roeck");
275	MODULE_DESCRIPTION("PMBus driver for TI UCD90xxx");
276	MODULE_LICENSE("GPL");
277	module_init(ucd9000_init);
278	module_exit(ucd9000_exit);