Guenter Roeck | 0c0a061 | 2011-03-08 22:01:39 -0800 | [diff] [blame^] | 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); |