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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); |