drivers/hwmon/ucd9000.c

   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);