drivers/hwmon/pmbus/lm25066.c

   1 /*
   2  * Hardware monitoring driver for LM25066 / LM5064 / LM5066
   3  *
   4  * Copyright (c) 2011 Ericsson AB.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20
  21 #include <linux/kernel.h>
  22 #include <linux/module.h>
  23 #include <linux/init.h>
  24 #include <linux/err.h>
  25 #include <linux/slab.h>
  26 #include <linux/i2c.h>
  27 #include "pmbus.h"
  28
  29 enum chips { lm25066, lm5064, lm5066 };
  30
  31 #define LM25066_READ_VAUX               0xd0
  32 #define LM25066_MFR_READ_IIN            0xd1
  33 #define LM25066_MFR_READ_PIN            0xd2
  34 #define LM25066_MFR_IIN_OC_WARN_LIMIT   0xd3
  35 #define LM25066_MFR_PIN_OP_WARN_LIMIT   0xd4
  36 #define LM25066_READ_PIN_PEAK           0xd5
  37 #define LM25066_CLEAR_PIN_PEAK          0xd6
  38 #define LM25066_DEVICE_SETUP            0xd9
  39 #define LM25066_READ_AVG_VIN            0xdc
  40 #define LM25066_READ_AVG_VOUT           0xdd
  41 #define LM25066_READ_AVG_IIN            0xde
  42 #define LM25066_READ_AVG_PIN            0xdf
  43
  44 #define LM25066_DEV_SETUP_CL            (1 << 4)        /* Current limit */
  45
  46 struct lm25066_data {
  47         int id;
  48         struct pmbus_driver_info info;
  49 };
  50
  51 #define to_lm25066_data(x)  container_of(x, struct lm25066_data, info)
  52
  53 static int lm25066_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 lm25066_data *data = to_lm25066_data(info);
  57         int ret;
  58
  59         if (page > 1)
  60                 return -EINVAL;
  61
  62         /* Map READ_VAUX into READ_VOUT register on page 1 */
  63         if (page == 1) {
  64                 switch (reg) {
  65                 case PMBUS_READ_VOUT:
  66                         ret = pmbus_read_word_data(client, 0,
  67                                                    LM25066_READ_VAUX);
  68                         if (ret < 0)
  69                                 break;
  70                         /* Adjust returned value to match VOUT coefficients */
  71                         switch (data->id) {
  72                         case lm25066:
  73                                 /* VOUT: 4.54 mV VAUX: 283.2 uV LSB */
  74                                 ret = DIV_ROUND_CLOSEST(ret * 2832, 45400);
  75                                 break;
  76                         case lm5064:
  77                                 /* VOUT: 4.53 mV VAUX: 700 uV LSB */
  78                                 ret = DIV_ROUND_CLOSEST(ret * 70, 453);
  79                                 break;
  80                         case lm5066:
  81                                 /* VOUT: 2.18 mV VAUX: 725 uV LSB */
  82                                 ret = DIV_ROUND_CLOSEST(ret * 725, 2180);
  83                                 break;
  84                         }
  85                         break;
  86                 default:
  87                         /* No other valid registers on page 1 */
  88                         ret = -EINVAL;
  89                         break;
  90                 }
  91                 goto done;
  92         }
  93
  94         switch (reg) {
  95         case PMBUS_READ_IIN:
  96                 ret = pmbus_read_word_data(client, 0, LM25066_MFR_READ_IIN);
  97                 break;
  98         case PMBUS_READ_PIN:
  99                 ret = pmbus_read_word_data(client, 0, LM25066_MFR_READ_PIN);
 100                 break;
 101         case PMBUS_IIN_OC_WARN_LIMIT:
 102                 ret = pmbus_read_word_data(client, 0,
 103                                            LM25066_MFR_IIN_OC_WARN_LIMIT);
 104                 break;
 105         case PMBUS_PIN_OP_WARN_LIMIT:
 106                 ret = pmbus_read_word_data(client, 0,
 107                                            LM25066_MFR_PIN_OP_WARN_LIMIT);
 108                 break;
 109         case PMBUS_VIRT_READ_VIN_AVG:
 110                 ret = pmbus_read_word_data(client, 0, LM25066_READ_AVG_VIN);
 111                 break;
 112         case PMBUS_VIRT_READ_VOUT_AVG:
 113                 ret = pmbus_read_word_data(client, 0, LM25066_READ_AVG_VOUT);
 114                 break;
 115         case PMBUS_VIRT_READ_IIN_AVG:
 116                 ret = pmbus_read_word_data(client, 0, LM25066_READ_AVG_IIN);
 117                 break;
 118         case PMBUS_VIRT_READ_PIN_AVG:
 119                 ret = pmbus_read_word_data(client, 0, LM25066_READ_AVG_PIN);
 120                 break;
 121         case PMBUS_VIRT_READ_PIN_MAX:
 122                 ret = pmbus_read_word_data(client, 0, LM25066_READ_PIN_PEAK);
 123                 break;
 124         case PMBUS_VIRT_RESET_PIN_HISTORY:
 125                 ret = 0;
 126                 break;
 127         default:
 128                 ret = -ENODATA;
 129                 break;
 130         }
 131 done:
 132         return ret;
 133 }
 134
 135 static int lm25066_write_word_data(struct i2c_client *client, int page, int reg,
 136                                    u16 word)
 137 {
 138         int ret;
 139
 140         if (page > 1)
 141                 return -EINVAL;
 142
 143         switch (reg) {
 144         case PMBUS_IIN_OC_WARN_LIMIT:
 145                 ret = pmbus_write_word_data(client, 0,
 146                                             LM25066_MFR_IIN_OC_WARN_LIMIT,
 147                                             word);
 148                 break;
 149         case PMBUS_PIN_OP_WARN_LIMIT:
 150                 ret = pmbus_write_word_data(client, 0,
 151                                             LM25066_MFR_PIN_OP_WARN_LIMIT,
 152                                             word);
 153                 break;
 154         case PMBUS_VIRT_RESET_PIN_HISTORY:
 155                 ret = pmbus_write_byte(client, 0, LM25066_CLEAR_PIN_PEAK);
 156                 break;
 157         default:
 158                 ret = -ENODATA;
 159                 break;
 160         }
 161         return ret;
 162 }
 163
 164 static int lm25066_write_byte(struct i2c_client *client, int page, u8 value)
 165 {
 166         if (page > 1)
 167                 return -EINVAL;
 168
 169         if (page == 0)
 170                 return pmbus_write_byte(client, 0, value);
 171
 172         return 0;
 173 }
 174
 175 static int lm25066_probe(struct i2c_client *client,
 176                           const struct i2c_device_id *id)
 177 {
 178         int config;
 179         int ret;
 180         struct lm25066_data *data;
 181         struct pmbus_driver_info *info;
 182
 183         if (!i2c_check_functionality(client->adapter,
 184                                      I2C_FUNC_SMBUS_READ_BYTE_DATA))
 185                 return -ENODEV;
 186
 187         data = kzalloc(sizeof(struct lm25066_data), GFP_KERNEL);
 188         if (!data)
 189                 return -ENOMEM;
 190
 191         config = i2c_smbus_read_byte_data(client, LM25066_DEVICE_SETUP);
 192         if (config < 0) {
 193                 ret = config;
 194                 goto err_mem;
 195         }
 196
 197         data->id = id->driver_data;
 198         info = &data->info;
 199
 200         info->pages = 2;
 201         info->format[PSC_VOLTAGE_IN] = direct;
 202         info->format[PSC_VOLTAGE_OUT] = direct;
 203         info->format[PSC_CURRENT_IN] = direct;
 204         info->format[PSC_TEMPERATURE] = direct;
 205         info->format[PSC_POWER] = direct;
 206
 207         info->m[PSC_TEMPERATURE] = 16;
 208         info->b[PSC_TEMPERATURE] = 0;
 209         info->R[PSC_TEMPERATURE] = 0;
 210
 211         info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT
 212           | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_PIN | PMBUS_HAVE_IIN
 213           | PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
 214         info->func[1] = PMBUS_HAVE_VOUT;
 215
 216         info->read_word_data = lm25066_read_word_data;
 217         info->write_word_data = lm25066_write_word_data;
 218         info->write_byte = lm25066_write_byte;
 219
 220         switch (id->driver_data) {
 221         case lm25066:
 222                 info->m[PSC_VOLTAGE_IN] = 22070;
 223                 info->b[PSC_VOLTAGE_IN] = 0;
 224                 info->R[PSC_VOLTAGE_IN] = -2;
 225                 info->m[PSC_VOLTAGE_OUT] = 22070;
 226                 info->b[PSC_VOLTAGE_OUT] = 0;
 227                 info->R[PSC_VOLTAGE_OUT] = -2;
 228
 229                 if (config & LM25066_DEV_SETUP_CL) {
 230                         info->m[PSC_CURRENT_IN] = 6852;
 231                         info->b[PSC_CURRENT_IN] = 0;
 232                         info->R[PSC_CURRENT_IN] = -2;
 233                         info->m[PSC_POWER] = 369;
 234                         info->b[PSC_POWER] = 0;
 235                         info->R[PSC_POWER] = -2;
 236                 } else {
 237                         info->m[PSC_CURRENT_IN] = 13661;
 238                         info->b[PSC_CURRENT_IN] = 0;
 239                         info->R[PSC_CURRENT_IN] = -2;
 240                         info->m[PSC_POWER] = 736;
 241                         info->b[PSC_POWER] = 0;
 242                         info->R[PSC_POWER] = -2;
 243                 }
 244                 break;
 245         case lm5064:
 246                 info->m[PSC_VOLTAGE_IN] = 22075;
 247                 info->b[PSC_VOLTAGE_IN] = 0;
 248                 info->R[PSC_VOLTAGE_IN] = -2;
 249                 info->m[PSC_VOLTAGE_OUT] = 22075;
 250                 info->b[PSC_VOLTAGE_OUT] = 0;
 251                 info->R[PSC_VOLTAGE_OUT] = -2;
 252
 253                 if (config & LM25066_DEV_SETUP_CL) {
 254                         info->m[PSC_CURRENT_IN] = 6713;
 255                         info->b[PSC_CURRENT_IN] = 0;
 256                         info->R[PSC_CURRENT_IN] = -2;
 257                         info->m[PSC_POWER] = 3619;
 258                         info->b[PSC_POWER] = 0;
 259                         info->R[PSC_POWER] = -3;
 260                 } else {
 261                         info->m[PSC_CURRENT_IN] = 13426;
 262                         info->b[PSC_CURRENT_IN] = 0;
 263                         info->R[PSC_CURRENT_IN] = -2;
 264                         info->m[PSC_POWER] = 7238;
 265                         info->b[PSC_POWER] = 0;
 266                         info->R[PSC_POWER] = -3;
 267                 }
 268                 break;
 269         case lm5066:
 270                 info->m[PSC_VOLTAGE_IN] = 4587;
 271                 info->b[PSC_VOLTAGE_IN] = 0;
 272                 info->R[PSC_VOLTAGE_IN] = -2;
 273                 info->m[PSC_VOLTAGE_OUT] = 4587;
 274                 info->b[PSC_VOLTAGE_OUT] = 0;
 275                 info->R[PSC_VOLTAGE_OUT] = -2;
 276
 277                 if (config & LM25066_DEV_SETUP_CL) {
 278                         info->m[PSC_CURRENT_IN] = 10753;
 279                         info->b[PSC_CURRENT_IN] = 0;
 280                         info->R[PSC_CURRENT_IN] = -2;
 281                         info->m[PSC_POWER] = 1204;
 282                         info->b[PSC_POWER] = 0;
 283                         info->R[PSC_POWER] = -3;
 284                 } else {
 285                         info->m[PSC_CURRENT_IN] = 5405;
 286                         info->b[PSC_CURRENT_IN] = 0;
 287                         info->R[PSC_CURRENT_IN] = -2;
 288                         info->m[PSC_POWER] = 605;
 289                         info->b[PSC_POWER] = 0;
 290                         info->R[PSC_POWER] = -3;
 291                 }
 292                 break;
 293         default:
 294                 ret = -ENODEV;
 295                 goto err_mem;
 296         }
 297
 298         ret = pmbus_do_probe(client, id, info);
 299         if (ret)
 300                 goto err_mem;
 301         return 0;
 302
 303 err_mem:
 304         kfree(data);
 305         return ret;
 306 }
 307
 308 static int lm25066_remove(struct i2c_client *client)
 309 {
 310         const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
 311         const struct lm25066_data *data = to_lm25066_data(info);
 312         int ret;
 313
 314         ret = pmbus_do_remove(client);
 315         kfree(data);
 316         return ret;
 317 }
 318
 319 static const struct i2c_device_id lm25066_id[] = {
 320         {"lm25066", lm25066},
 321         {"lm5064", lm5064},
 322         {"lm5066", lm5066},
 323         { }
 324 };
 325
 326 MODULE_DEVICE_TABLE(i2c, lm25066_id);
 327
 328 /* This is the driver that will be inserted */
 329 static struct i2c_driver lm25066_driver = {
 330         .driver = {
 331                    .name = "lm25066",
 332                    },
 333         .probe = lm25066_probe,
 334         .remove = lm25066_remove,
 335         .id_table = lm25066_id,
 336 };
 337
 338 static int __init lm25066_init(void)
 339 {
 340         return i2c_add_driver(&lm25066_driver);
 341 }
 342
 343 static void __exit lm25066_exit(void)
 344 {
 345         i2c_del_driver(&lm25066_driver);
 346 }
 347
 348 MODULE_AUTHOR("Guenter Roeck");
 349 MODULE_DESCRIPTION("PMBus driver for LM25066/LM5064/LM5066");
 350 MODULE_LICENSE("GPL");
 351 module_init(lm25066_init);
 352 module_exit(lm25066_exit);