ucd9000.c revision 179144a0d4128e7588b3d613a14807402f5e7c37 
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
31enum 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
49struct 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
55static 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
70static 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 -ENXIO;
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 -ENXIO;
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
111static const struct i2c_device_id ucd9000_id[] = {
112	{"ucd9000", ucd9000},
113	{"ucd90120", ucd90120},
114	{"ucd90124", ucd90124},
115	{"ucd9090", ucd9090},
116	{"ucd90910", ucd90910},
117	{}
118};
119MODULE_DEVICE_TABLE(i2c, ucd9000_id);
120
121static 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	for (mid = ucd9000_id; mid->name[0]; mid++) {
145		if (!strncasecmp(mid->name, block_buffer, strlen(mid->name)))
146			break;
147	}
148	if (!mid->name[0]) {
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
235out:
236	kfree(data);
237	return ret;
238}
239
240static int ucd9000_remove(struct i2c_client *client)
241{
242	struct ucd9000_data *data;
243
244	data = to_ucd9000_data(pmbus_get_driver_info(client));
245	pmbus_do_remove(client);
246	kfree(data);
247	return 0;
248}
249
250
251/* This is the driver that will be inserted */
252static 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
261static int __init ucd9000_init(void)
262{
263	return i2c_add_driver(&ucd9000_driver);
264}
265
266static void __exit ucd9000_exit(void)
267{
268	i2c_del_driver(&ucd9000_driver);
269}
270
271MODULE_AUTHOR("Guenter Roeck");
272MODULE_DESCRIPTION("PMBus driver for TI UCD90xxx");
273MODULE_LICENSE("GPL");
274module_init(ucd9000_init);
275module_exit(ucd9000_exit);
276