blob: ace1c731973435581b4d41efedf72bf19f8a888f [file] [log] [blame]
Guenter Roeck0c0a0612011-03-08 22:01:39 -08001/*
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 -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
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 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
237out:
238 kfree(data);
239 return ret;
240}
241
242static 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 */
255static 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
264static int __init ucd9000_init(void)
265{
266 return i2c_add_driver(&ucd9000_driver);
267}
268
269static void __exit ucd9000_exit(void)
270{
271 i2c_del_driver(&ucd9000_driver);
272}
273
274MODULE_AUTHOR("Guenter Roeck");
275MODULE_DESCRIPTION("PMBus driver for TI UCD90xxx");
276MODULE_LICENSE("GPL");
277module_init(ucd9000_init);
278module_exit(ucd9000_exit);