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, ucd90160, 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         {"ucd90160", ucd90160},
 116         {"ucd9090", ucd9090},
 117         {"ucd90910", ucd90910},
 118         {}
 119 };
 120 MODULE_DEVICE_TABLE(i2c, ucd9000_id);
 121
 122 static int ucd9000_probe(struct i2c_client *client,
 123                          const struct i2c_device_id *id)
 124 {
 125         u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1];
 126         struct ucd9000_data *data;
 127         struct pmbus_driver_info *info;
 128         const struct i2c_device_id *mid;
 129         int i, ret;
 130
 131         if (!i2c_check_functionality(client->adapter,
 132                                      I2C_FUNC_SMBUS_BYTE_DATA |
 133                                      I2C_FUNC_SMBUS_BLOCK_DATA))
 134                 return -ENODEV;
 135
 136         ret = i2c_smbus_read_block_data(client, UCD9000_DEVICE_ID,
 137                                         block_buffer);
 138         if (ret < 0) {
 139                 dev_err(&client->dev, "Failed to read device ID\n");
 140                 return ret;
 141         }
 142         block_buffer[ret] = '\0';
 143         dev_info(&client->dev, "Device ID %s\n", block_buffer);
 144
 145         for (mid = ucd9000_id; mid->name[0]; mid++) {
 146                 if (!strncasecmp(mid->name, block_buffer, strlen(mid->name)))
 147                         break;
 148         }
 149         if (!mid->name[0]) {
 150                 dev_err(&client->dev, "Unsupported device\n");
 151                 return -ENODEV;
 152         }
 153
 154         if (id->driver_data != ucd9000 && id->driver_data != mid->driver_data)
 155                 dev_notice(&client->dev,
 156                            "Device mismatch: Configured %s, detected %s\n",
 157                            id->name, mid->name);
 158
 159         data = devm_kzalloc(&client->dev, sizeof(struct ucd9000_data),
 160                             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                 return ret;
 170         }
 171         info->pages = ret;
 172         if (!info->pages) {
 173                 dev_err(&client->dev, "No pages configured\n");
 174                 return -ENODEV;
 175         }
 176
 177         /* The internal temperature sensor is always active */
 178         info->func[0] = PMBUS_HAVE_TEMP;
 179
 180         /* Everything else is configurable */
 181         ret = i2c_smbus_read_block_data(client, UCD9000_MONITOR_CONFIG,
 182                                         block_buffer);
 183         if (ret <= 0) {
 184                 dev_err(&client->dev, "Failed to read configuration data\n");
 185                 return -ENODEV;
 186         }
 187         for (i = 0; i < ret; i++) {
 188                 int page = UCD9000_MON_PAGE(block_buffer[i]);
 189
 190                 if (page >= info->pages)
 191                         continue;
 192
 193                 switch (UCD9000_MON_TYPE(block_buffer[i])) {
 194                 case UCD9000_MON_VOLTAGE:
 195                 case UCD9000_MON_VOLTAGE_HW:
 196                         info->func[page] |= PMBUS_HAVE_VOUT
 197                           | PMBUS_HAVE_STATUS_VOUT;
 198                         break;
 199                 case UCD9000_MON_TEMPERATURE:
 200                         info->func[page] |= PMBUS_HAVE_TEMP2
 201                           | PMBUS_HAVE_STATUS_TEMP;
 202                         break;
 203                 case UCD9000_MON_CURRENT:
 204                         info->func[page] |= PMBUS_HAVE_IOUT
 205                           | PMBUS_HAVE_STATUS_IOUT;
 206                         break;
 207                 default:
 208                         break;
 209                 }
 210         }
 211
 212         /* Fan configuration */
 213         if (mid->driver_data == ucd90124) {
 214                 for (i = 0; i < UCD9000_NUM_FAN; i++) {
 215                         i2c_smbus_write_byte_data(client,
 216                                                   UCD9000_FAN_CONFIG_INDEX, i);
 217                         ret = i2c_smbus_read_block_data(client,
 218                                                         UCD9000_FAN_CONFIG,
 219                                                         data->fan_data[i]);
 220                         if (ret < 0)
 221                                 return ret;
 222                 }
 223                 i2c_smbus_write_byte_data(client, UCD9000_FAN_CONFIG_INDEX, 0);
 224
 225                 info->read_byte_data = ucd9000_read_byte_data;
 226                 info->func[0] |= PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12
 227                   | PMBUS_HAVE_FAN34 | PMBUS_HAVE_STATUS_FAN34;
 228         }
 229
 230         return pmbus_do_probe(client, mid, info);
 231 }
 232
 233 /* This is the driver that will be inserted */
 234 static struct i2c_driver ucd9000_driver = {
 235         .driver = {
 236                 .name = "ucd9000",
 237         },
 238         .probe = ucd9000_probe,
 239         .remove = pmbus_do_remove,
 240         .id_table = ucd9000_id,
 241 };
 242
 243 module_i2c_driver(ucd9000_driver);
 244
 245 MODULE_AUTHOR("Guenter Roeck");
 246 MODULE_DESCRIPTION("PMBus driver for TI UCD90xxx");
 247 MODULE_LICENSE("GPL");