kernel/drivers/hwmon/pmbus/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 > 0)
  78                         return -ENXIO;
  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 > 0)
  92                         return -ENXIO;
  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         for (mid = ucd9000_id; mid->name[0]; mid++) {
 145                 if (!strncasecmp(mid->name, block_buffer, strlen(mid->name)))
 146                         break;
 147         }
 148         if (!mid->name[0]) {
 149                 dev_err(&client->dev, "Unsupported device\n");
 150                 return -ENODEV;
 151         }
 152
 153         if (id->driver_data != ucd9000 && id->driver_data != mid->driver_data)
 154                 dev_notice(&client->dev,
 155                            "Device mismatch: Configured %s, detected %s\n",
 156                            id->name, mid->name);
 157
 158         data = devm_kzalloc(&client->dev, sizeof(struct ucd9000_data),
 159                             GFP_KERNEL);
 160         if (!data)
 161                 return -ENOMEM;
 162         info = &data->info;
 163
 164         ret = i2c_smbus_read_byte_data(client, UCD9000_NUM_PAGES);
 165         if (ret < 0) {
 166                 dev_err(&client->dev,
 167                         "Failed to read number of active pages\n");
 168                 return ret;
 169         }
 170         info->pages = ret;
 171         if (!info->pages) {
 172                 dev_err(&client->dev, "No pages configured\n");
 173                 return -ENODEV;
 174         }
 175
 176         /* The internal temperature sensor is always active */
 177         info->func[0] = PMBUS_HAVE_TEMP;
 178
 179         /* Everything else is configurable */
 180         ret = i2c_smbus_read_block_data(client, UCD9000_MONITOR_CONFIG,
 181                                         block_buffer);
 182         if (ret <= 0) {
 183                 dev_err(&client->dev, "Failed to read configuration data\n");
 184                 return -ENODEV;
 185         }
 186         for (i = 0; i < ret; i++) {
 187                 int page = UCD9000_MON_PAGE(block_buffer[i]);
 188
 189                 if (page >= info->pages)
 190                         continue;
 191
 192                 switch (UCD9000_MON_TYPE(block_buffer[i])) {
 193                 case UCD9000_MON_VOLTAGE:
 194                 case UCD9000_MON_VOLTAGE_HW:
 195                         info->func[page] |= PMBUS_HAVE_VOUT
 196                           | PMBUS_HAVE_STATUS_VOUT;
 197                         break;
 198                 case UCD9000_MON_TEMPERATURE:
 199                         info->func[page] |= PMBUS_HAVE_TEMP2
 200                           | PMBUS_HAVE_STATUS_TEMP;
 201                         break;
 202                 case UCD9000_MON_CURRENT:
 203                         info->func[page] |= PMBUS_HAVE_IOUT
 204                           | PMBUS_HAVE_STATUS_IOUT;
 205                         break;
 206                 default:
 207                         break;
 208                 }
 209         }
 210
 211         /* Fan configuration */
 212         if (mid->driver_data == ucd90124) {
 213                 for (i = 0; i < UCD9000_NUM_FAN; i++) {
 214                         i2c_smbus_write_byte_data(client,
 215                                                   UCD9000_FAN_CONFIG_INDEX, i);
 216                         ret = i2c_smbus_read_block_data(client,
 217                                                         UCD9000_FAN_CONFIG,
 218                                                         data->fan_data[i]);
 219                         if (ret < 0)
 220                                 return ret;
 221                 }
 222                 i2c_smbus_write_byte_data(client, UCD9000_FAN_CONFIG_INDEX, 0);
 223
 224                 info->read_byte_data = ucd9000_read_byte_data;
 225                 info->func[0] |= PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12
 226                   | PMBUS_HAVE_FAN34 | PMBUS_HAVE_STATUS_FAN34;
 227         }
 228
 229         return pmbus_do_probe(client, mid, info);
 230 }
 231
 232 /* This is the driver that will be inserted */
 233 static struct i2c_driver ucd9000_driver = {
 234         .driver = {
 235                 .name = "ucd9000",
 236         },
 237         .probe = ucd9000_probe,
 238         .remove = pmbus_do_remove,
 239         .id_table = ucd9000_id,
 240 };
 241
 242 module_i2c_driver(ucd9000_driver);
 243
 244 MODULE_AUTHOR("Guenter Roeck");
 245 MODULE_DESCRIPTION("PMBus driver for TI UCD90xxx");
 246 MODULE_LICENSE("GPL");