Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[pandora-kernel.git] / drivers / hwmon / pmbus / adm1275.c
1 /*
2  * Hardware monitoring driver for Analog Devices ADM1275 Hot-Swap Controller
3  * and Digital Power Monitor
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
18 #include <linux/kernel.h>
19 #include <linux/module.h>
20 #include <linux/init.h>
21 #include <linux/err.h>
22 #include <linux/slab.h>
23 #include <linux/i2c.h>
24 #include "pmbus.h"
25
26 enum chips { adm1275, adm1276 };
27
28 #define ADM1275_PEAK_IOUT               0xd0
29 #define ADM1275_PEAK_VIN                0xd1
30 #define ADM1275_PEAK_VOUT               0xd2
31 #define ADM1275_PMON_CONFIG             0xd4
32
33 #define ADM1275_VIN_VOUT_SELECT         (1 << 6)
34 #define ADM1275_VRANGE                  (1 << 5)
35
36 #define ADM1275_IOUT_WARN2_LIMIT        0xd7
37 #define ADM1275_DEVICE_CONFIG           0xd8
38
39 #define ADM1275_IOUT_WARN2_SELECT       (1 << 4)
40
41 #define ADM1276_PEAK_PIN                0xda
42
43 #define ADM1275_MFR_STATUS_IOUT_WARN2   (1 << 0)
44
45 struct adm1275_data {
46         int id;
47         bool have_oc_fault;
48         struct pmbus_driver_info info;
49 };
50
51 #define to_adm1275_data(x)  container_of(x, struct adm1275_data, info)
52
53 static int adm1275_read_word_data(struct i2c_client *client, int page, int reg)
54 {
55         const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
56         const struct adm1275_data *data = to_adm1275_data(info);
57         int ret = 0;
58
59         if (page)
60                 return -ENXIO;
61
62         switch (reg) {
63         case PMBUS_IOUT_UC_FAULT_LIMIT:
64                 if (data->have_oc_fault) {
65                         ret = -ENXIO;
66                         break;
67                 }
68                 ret = pmbus_read_word_data(client, 0, ADM1275_IOUT_WARN2_LIMIT);
69                 break;
70         case PMBUS_IOUT_OC_FAULT_LIMIT:
71                 if (!data->have_oc_fault) {
72                         ret = -ENXIO;
73                         break;
74                 }
75                 ret = pmbus_read_word_data(client, 0, ADM1275_IOUT_WARN2_LIMIT);
76                 break;
77         case PMBUS_VIRT_READ_IOUT_MAX:
78                 ret = pmbus_read_word_data(client, 0, ADM1275_PEAK_IOUT);
79                 break;
80         case PMBUS_VIRT_READ_VOUT_MAX:
81                 ret = pmbus_read_word_data(client, 0, ADM1275_PEAK_VOUT);
82                 break;
83         case PMBUS_VIRT_READ_VIN_MAX:
84                 ret = pmbus_read_word_data(client, 0, ADM1275_PEAK_VIN);
85                 break;
86         case PMBUS_VIRT_READ_PIN_MAX:
87                 if (data->id != adm1276) {
88                         ret = -ENXIO;
89                         break;
90                 }
91                 ret = pmbus_read_word_data(client, 0, ADM1276_PEAK_PIN);
92                 break;
93         case PMBUS_VIRT_RESET_IOUT_HISTORY:
94         case PMBUS_VIRT_RESET_VOUT_HISTORY:
95         case PMBUS_VIRT_RESET_VIN_HISTORY:
96                 break;
97         case PMBUS_VIRT_RESET_PIN_HISTORY:
98                 if (data->id != adm1276)
99                         ret = -ENXIO;
100                 break;
101         default:
102                 ret = -ENODATA;
103                 break;
104         }
105         return ret;
106 }
107
108 static int adm1275_write_word_data(struct i2c_client *client, int page, int reg,
109                                    u16 word)
110 {
111         int ret;
112
113         if (page)
114                 return -ENXIO;
115
116         switch (reg) {
117         case PMBUS_IOUT_UC_FAULT_LIMIT:
118         case PMBUS_IOUT_OC_FAULT_LIMIT:
119                 ret = pmbus_write_word_data(client, 0, ADM1275_IOUT_WARN2_LIMIT,
120                                             word);
121                 break;
122         case PMBUS_VIRT_RESET_IOUT_HISTORY:
123                 ret = pmbus_write_word_data(client, 0, ADM1275_PEAK_IOUT, 0);
124                 break;
125         case PMBUS_VIRT_RESET_VOUT_HISTORY:
126                 ret = pmbus_write_word_data(client, 0, ADM1275_PEAK_VOUT, 0);
127                 break;
128         case PMBUS_VIRT_RESET_VIN_HISTORY:
129                 ret = pmbus_write_word_data(client, 0, ADM1275_PEAK_VIN, 0);
130                 break;
131         case PMBUS_VIRT_RESET_PIN_HISTORY:
132                 ret = pmbus_write_word_data(client, 0, ADM1276_PEAK_PIN, 0);
133                 break;
134         default:
135                 ret = -ENODATA;
136                 break;
137         }
138         return ret;
139 }
140
141 static int adm1275_read_byte_data(struct i2c_client *client, int page, int reg)
142 {
143         const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
144         const struct adm1275_data *data = to_adm1275_data(info);
145         int mfr_status, ret;
146
147         if (page > 0)
148                 return -ENXIO;
149
150         switch (reg) {
151         case PMBUS_STATUS_IOUT:
152                 ret = pmbus_read_byte_data(client, page, PMBUS_STATUS_IOUT);
153                 if (ret < 0)
154                         break;
155                 mfr_status = pmbus_read_byte_data(client, page,
156                                                   PMBUS_STATUS_MFR_SPECIFIC);
157                 if (mfr_status < 0) {
158                         ret = mfr_status;
159                         break;
160                 }
161                 if (mfr_status & ADM1275_MFR_STATUS_IOUT_WARN2) {
162                         ret |= data->have_oc_fault ?
163                           PB_IOUT_OC_FAULT : PB_IOUT_UC_FAULT;
164                 }
165                 break;
166         default:
167                 ret = -ENODATA;
168                 break;
169         }
170         return ret;
171 }
172
173 static int adm1275_probe(struct i2c_client *client,
174                          const struct i2c_device_id *id)
175 {
176         int config, device_config;
177         int ret;
178         struct pmbus_driver_info *info;
179         struct adm1275_data *data;
180
181         if (!i2c_check_functionality(client->adapter,
182                                      I2C_FUNC_SMBUS_READ_BYTE_DATA))
183                 return -ENODEV;
184
185         data = kzalloc(sizeof(struct adm1275_data), GFP_KERNEL);
186         if (!data)
187                 return -ENOMEM;
188
189         config = i2c_smbus_read_byte_data(client, ADM1275_PMON_CONFIG);
190         if (config < 0) {
191                 ret = config;
192                 goto err_mem;
193         }
194
195         device_config = i2c_smbus_read_byte_data(client, ADM1275_DEVICE_CONFIG);
196         if (device_config < 0) {
197                 ret = device_config;
198                 goto err_mem;
199         }
200
201         data->id = id->driver_data;
202         info = &data->info;
203
204         info->pages = 1;
205         info->format[PSC_VOLTAGE_IN] = direct;
206         info->format[PSC_VOLTAGE_OUT] = direct;
207         info->format[PSC_CURRENT_OUT] = direct;
208         info->m[PSC_CURRENT_OUT] = 807;
209         info->b[PSC_CURRENT_OUT] = 20475;
210         info->R[PSC_CURRENT_OUT] = -1;
211         info->func[0] = PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT;
212
213         info->read_word_data = adm1275_read_word_data;
214         info->read_byte_data = adm1275_read_byte_data;
215         info->write_word_data = adm1275_write_word_data;
216
217         if (config & ADM1275_VRANGE) {
218                 info->m[PSC_VOLTAGE_IN] = 19199;
219                 info->b[PSC_VOLTAGE_IN] = 0;
220                 info->R[PSC_VOLTAGE_IN] = -2;
221                 info->m[PSC_VOLTAGE_OUT] = 19199;
222                 info->b[PSC_VOLTAGE_OUT] = 0;
223                 info->R[PSC_VOLTAGE_OUT] = -2;
224         } else {
225                 info->m[PSC_VOLTAGE_IN] = 6720;
226                 info->b[PSC_VOLTAGE_IN] = 0;
227                 info->R[PSC_VOLTAGE_IN] = -1;
228                 info->m[PSC_VOLTAGE_OUT] = 6720;
229                 info->b[PSC_VOLTAGE_OUT] = 0;
230                 info->R[PSC_VOLTAGE_OUT] = -1;
231         }
232
233         if (device_config & ADM1275_IOUT_WARN2_SELECT)
234                 data->have_oc_fault = true;
235
236         switch (id->driver_data) {
237         case adm1275:
238                 if (config & ADM1275_VIN_VOUT_SELECT)
239                         info->func[0] |=
240                           PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
241                 else
242                         info->func[0] |=
243                           PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT;
244                 break;
245         case adm1276:
246                 info->format[PSC_POWER] = direct;
247                 info->func[0] |= PMBUS_HAVE_VIN | PMBUS_HAVE_PIN
248                   | PMBUS_HAVE_STATUS_INPUT;
249                 if (config & ADM1275_VIN_VOUT_SELECT)
250                         info->func[0] |=
251                           PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
252                 if (config & ADM1275_VRANGE) {
253                         info->m[PSC_POWER] = 6043;
254                         info->b[PSC_POWER] = 0;
255                         info->R[PSC_POWER] = -2;
256                 } else {
257                         info->m[PSC_POWER] = 2115;
258                         info->b[PSC_POWER] = 0;
259                         info->R[PSC_POWER] = -1;
260                 }
261                 break;
262         }
263
264         ret = pmbus_do_probe(client, id, info);
265         if (ret)
266                 goto err_mem;
267         return 0;
268
269 err_mem:
270         kfree(data);
271         return ret;
272 }
273
274 static int adm1275_remove(struct i2c_client *client)
275 {
276         const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
277         const struct adm1275_data *data = to_adm1275_data(info);
278
279         pmbus_do_remove(client);
280         kfree(data);
281         return 0;
282 }
283
284 static const struct i2c_device_id adm1275_id[] = {
285         { "adm1275", adm1275 },
286         { "adm1276", adm1276 },
287         { }
288 };
289 MODULE_DEVICE_TABLE(i2c, adm1275_id);
290
291 static struct i2c_driver adm1275_driver = {
292         .driver = {
293                    .name = "adm1275",
294                    },
295         .probe = adm1275_probe,
296         .remove = adm1275_remove,
297         .id_table = adm1275_id,
298 };
299
300 static int __init adm1275_init(void)
301 {
302         return i2c_add_driver(&adm1275_driver);
303 }
304
305 static void __exit adm1275_exit(void)
306 {
307         i2c_del_driver(&adm1275_driver);
308 }
309
310 MODULE_AUTHOR("Guenter Roeck");
311 MODULE_DESCRIPTION("PMBus driver for Analog Devices ADM1275 and compatibles");
312 MODULE_LICENSE("GPL");
313 module_init(adm1275_init);
314 module_exit(adm1275_exit);