Guenter Roeck | 502b5a0 | 2010-09-29 20:12:08 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Driver for Lineage Compact Power Line series of power entry modules. |
| 3 | * |
| 4 | * Copyright (C) 2010, 2011 Ericsson AB. |
| 5 | * |
| 6 | * Documentation: |
| 7 | * http://www.lineagepower.com/oem/pdf/CPLI2C.pdf |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License as published by |
| 11 | * the Free Software Foundation; either version 2 of the License, or |
| 12 | * (at your option) any later version. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | * GNU General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU General Public License |
| 20 | * along with this program; if not, write to the Free Software |
| 21 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 22 | */ |
| 23 | |
| 24 | #include <linux/kernel.h> |
| 25 | #include <linux/module.h> |
| 26 | #include <linux/init.h> |
| 27 | #include <linux/err.h> |
| 28 | #include <linux/slab.h> |
| 29 | #include <linux/i2c.h> |
| 30 | #include <linux/hwmon.h> |
| 31 | #include <linux/hwmon-sysfs.h> |
Jean Delvare | dcd8f39 | 2012-10-10 15:25:56 +0200 | [diff] [blame^] | 32 | #include <linux/jiffies.h> |
Guenter Roeck | 502b5a0 | 2010-09-29 20:12:08 -0700 | [diff] [blame] | 33 | |
| 34 | /* |
| 35 | * This driver supports various Lineage Compact Power Line DC/DC and AC/DC |
| 36 | * converters such as CP1800, CP2000AC, CP2000DC, CP2100DC, and others. |
| 37 | * |
| 38 | * The devices are nominally PMBus compliant. However, most standard PMBus |
| 39 | * commands are not supported. Specifically, all hardware monitoring and |
| 40 | * status reporting commands are non-standard. For this reason, a standard |
| 41 | * PMBus driver can not be used. |
| 42 | * |
| 43 | * All Lineage CPL devices have a built-in I2C bus master selector (PCA9541). |
| 44 | * To ensure device access, this driver should only be used as client driver |
| 45 | * to the pca9541 I2C master selector driver. |
| 46 | */ |
| 47 | |
| 48 | /* Command codes */ |
| 49 | #define PEM_OPERATION 0x01 |
| 50 | #define PEM_CLEAR_INFO_FLAGS 0x03 |
| 51 | #define PEM_VOUT_COMMAND 0x21 |
| 52 | #define PEM_VOUT_OV_FAULT_LIMIT 0x40 |
| 53 | #define PEM_READ_DATA_STRING 0xd0 |
| 54 | #define PEM_READ_INPUT_STRING 0xdc |
| 55 | #define PEM_READ_FIRMWARE_REV 0xdd |
| 56 | #define PEM_READ_RUN_TIMER 0xde |
| 57 | #define PEM_FAN_HI_SPEED 0xdf |
| 58 | #define PEM_FAN_NORMAL_SPEED 0xe0 |
| 59 | #define PEM_READ_FAN_SPEED 0xe1 |
| 60 | |
| 61 | /* offsets in data string */ |
| 62 | #define PEM_DATA_STATUS_2 0 |
| 63 | #define PEM_DATA_STATUS_1 1 |
| 64 | #define PEM_DATA_ALARM_2 2 |
| 65 | #define PEM_DATA_ALARM_1 3 |
| 66 | #define PEM_DATA_VOUT_LSB 4 |
| 67 | #define PEM_DATA_VOUT_MSB 5 |
| 68 | #define PEM_DATA_CURRENT 6 |
| 69 | #define PEM_DATA_TEMP 7 |
| 70 | |
| 71 | /* Virtual entries, to report constants */ |
| 72 | #define PEM_DATA_TEMP_MAX 10 |
| 73 | #define PEM_DATA_TEMP_CRIT 11 |
| 74 | |
| 75 | /* offsets in input string */ |
| 76 | #define PEM_INPUT_VOLTAGE 0 |
| 77 | #define PEM_INPUT_POWER_LSB 1 |
| 78 | #define PEM_INPUT_POWER_MSB 2 |
| 79 | |
| 80 | /* offsets in fan data */ |
| 81 | #define PEM_FAN_ADJUSTMENT 0 |
| 82 | #define PEM_FAN_FAN1 1 |
| 83 | #define PEM_FAN_FAN2 2 |
| 84 | #define PEM_FAN_FAN3 3 |
| 85 | |
| 86 | /* Status register bits */ |
| 87 | #define STS1_OUTPUT_ON (1 << 0) |
| 88 | #define STS1_LEDS_FLASHING (1 << 1) |
| 89 | #define STS1_EXT_FAULT (1 << 2) |
| 90 | #define STS1_SERVICE_LED_ON (1 << 3) |
| 91 | #define STS1_SHUTDOWN_OCCURRED (1 << 4) |
| 92 | #define STS1_INT_FAULT (1 << 5) |
| 93 | #define STS1_ISOLATION_TEST_OK (1 << 6) |
| 94 | |
| 95 | #define STS2_ENABLE_PIN_HI (1 << 0) |
| 96 | #define STS2_DATA_OUT_RANGE (1 << 1) |
| 97 | #define STS2_RESTARTED_OK (1 << 1) |
| 98 | #define STS2_ISOLATION_TEST_FAIL (1 << 3) |
| 99 | #define STS2_HIGH_POWER_CAP (1 << 4) |
| 100 | #define STS2_INVALID_INSTR (1 << 5) |
| 101 | #define STS2_WILL_RESTART (1 << 6) |
| 102 | #define STS2_PEC_ERR (1 << 7) |
| 103 | |
| 104 | /* Alarm register bits */ |
| 105 | #define ALRM1_VIN_OUT_LIMIT (1 << 0) |
| 106 | #define ALRM1_VOUT_OUT_LIMIT (1 << 1) |
| 107 | #define ALRM1_OV_VOLT_SHUTDOWN (1 << 2) |
| 108 | #define ALRM1_VIN_OVERCURRENT (1 << 3) |
| 109 | #define ALRM1_TEMP_WARNING (1 << 4) |
| 110 | #define ALRM1_TEMP_SHUTDOWN (1 << 5) |
| 111 | #define ALRM1_PRIMARY_FAULT (1 << 6) |
| 112 | #define ALRM1_POWER_LIMIT (1 << 7) |
| 113 | |
| 114 | #define ALRM2_5V_OUT_LIMIT (1 << 1) |
| 115 | #define ALRM2_TEMP_FAULT (1 << 2) |
| 116 | #define ALRM2_OV_LOW (1 << 3) |
| 117 | #define ALRM2_DCDC_TEMP_HIGH (1 << 4) |
| 118 | #define ALRM2_PRI_TEMP_HIGH (1 << 5) |
| 119 | #define ALRM2_NO_PRIMARY (1 << 6) |
| 120 | #define ALRM2_FAN_FAULT (1 << 7) |
| 121 | |
| 122 | #define FIRMWARE_REV_LEN 4 |
| 123 | #define DATA_STRING_LEN 9 |
| 124 | #define INPUT_STRING_LEN 5 /* 4 for most devices */ |
| 125 | #define FAN_SPEED_LEN 5 |
| 126 | |
| 127 | struct pem_data { |
| 128 | struct device *hwmon_dev; |
| 129 | |
| 130 | struct mutex update_lock; |
| 131 | bool valid; |
| 132 | bool fans_supported; |
| 133 | int input_length; |
| 134 | unsigned long last_updated; /* in jiffies */ |
| 135 | |
| 136 | u8 firmware_rev[FIRMWARE_REV_LEN]; |
| 137 | u8 data_string[DATA_STRING_LEN]; |
| 138 | u8 input_string[INPUT_STRING_LEN]; |
| 139 | u8 fan_speed[FAN_SPEED_LEN]; |
| 140 | }; |
| 141 | |
| 142 | static int pem_read_block(struct i2c_client *client, u8 command, u8 *data, |
| 143 | int data_len) |
| 144 | { |
| 145 | u8 block_buffer[I2C_SMBUS_BLOCK_MAX]; |
| 146 | int result; |
| 147 | |
| 148 | result = i2c_smbus_read_block_data(client, command, block_buffer); |
| 149 | if (unlikely(result < 0)) |
| 150 | goto abort; |
| 151 | if (unlikely(result == 0xff || result != data_len)) { |
| 152 | result = -EIO; |
| 153 | goto abort; |
| 154 | } |
| 155 | memcpy(data, block_buffer, data_len); |
| 156 | result = 0; |
| 157 | abort: |
| 158 | return result; |
| 159 | } |
| 160 | |
| 161 | static struct pem_data *pem_update_device(struct device *dev) |
| 162 | { |
| 163 | struct i2c_client *client = to_i2c_client(dev); |
| 164 | struct pem_data *data = i2c_get_clientdata(client); |
| 165 | struct pem_data *ret = data; |
| 166 | |
| 167 | mutex_lock(&data->update_lock); |
| 168 | |
| 169 | if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { |
| 170 | int result; |
| 171 | |
| 172 | /* Read data string */ |
| 173 | result = pem_read_block(client, PEM_READ_DATA_STRING, |
| 174 | data->data_string, |
| 175 | sizeof(data->data_string)); |
| 176 | if (unlikely(result < 0)) { |
| 177 | ret = ERR_PTR(result); |
| 178 | goto abort; |
| 179 | } |
| 180 | |
| 181 | /* Read input string */ |
| 182 | if (data->input_length) { |
| 183 | result = pem_read_block(client, PEM_READ_INPUT_STRING, |
| 184 | data->input_string, |
| 185 | data->input_length); |
| 186 | if (unlikely(result < 0)) { |
| 187 | ret = ERR_PTR(result); |
| 188 | goto abort; |
| 189 | } |
| 190 | } |
| 191 | |
| 192 | /* Read fan speeds */ |
| 193 | if (data->fans_supported) { |
| 194 | result = pem_read_block(client, PEM_READ_FAN_SPEED, |
| 195 | data->fan_speed, |
| 196 | sizeof(data->fan_speed)); |
| 197 | if (unlikely(result < 0)) { |
| 198 | ret = ERR_PTR(result); |
| 199 | goto abort; |
| 200 | } |
| 201 | } |
| 202 | |
| 203 | i2c_smbus_write_byte(client, PEM_CLEAR_INFO_FLAGS); |
| 204 | |
| 205 | data->last_updated = jiffies; |
| 206 | data->valid = 1; |
| 207 | } |
| 208 | abort: |
| 209 | mutex_unlock(&data->update_lock); |
| 210 | return ret; |
| 211 | } |
| 212 | |
| 213 | static long pem_get_data(u8 *data, int len, int index) |
| 214 | { |
| 215 | long val; |
| 216 | |
| 217 | switch (index) { |
| 218 | case PEM_DATA_VOUT_LSB: |
| 219 | val = (data[index] + (data[index+1] << 8)) * 5 / 2; |
| 220 | break; |
| 221 | case PEM_DATA_CURRENT: |
| 222 | val = data[index] * 200; |
| 223 | break; |
| 224 | case PEM_DATA_TEMP: |
| 225 | val = data[index] * 1000; |
| 226 | break; |
| 227 | case PEM_DATA_TEMP_MAX: |
| 228 | val = 97 * 1000; /* 97 degrees C per datasheet */ |
| 229 | break; |
| 230 | case PEM_DATA_TEMP_CRIT: |
| 231 | val = 107 * 1000; /* 107 degrees C per datasheet */ |
| 232 | break; |
| 233 | default: |
| 234 | WARN_ON_ONCE(1); |
| 235 | val = 0; |
| 236 | } |
| 237 | return val; |
| 238 | } |
| 239 | |
| 240 | static long pem_get_input(u8 *data, int len, int index) |
| 241 | { |
| 242 | long val; |
| 243 | |
| 244 | switch (index) { |
| 245 | case PEM_INPUT_VOLTAGE: |
| 246 | if (len == INPUT_STRING_LEN) |
| 247 | val = (data[index] + (data[index+1] << 8) - 75) * 1000; |
| 248 | else |
| 249 | val = (data[index] - 75) * 1000; |
| 250 | break; |
| 251 | case PEM_INPUT_POWER_LSB: |
| 252 | if (len == INPUT_STRING_LEN) |
| 253 | index++; |
| 254 | val = (data[index] + (data[index+1] << 8)) * 1000000L; |
| 255 | break; |
| 256 | default: |
| 257 | WARN_ON_ONCE(1); |
| 258 | val = 0; |
| 259 | } |
| 260 | return val; |
| 261 | } |
| 262 | |
| 263 | static long pem_get_fan(u8 *data, int len, int index) |
| 264 | { |
| 265 | long val; |
| 266 | |
| 267 | switch (index) { |
| 268 | case PEM_FAN_FAN1: |
| 269 | case PEM_FAN_FAN2: |
| 270 | case PEM_FAN_FAN3: |
| 271 | val = data[index] * 100; |
| 272 | break; |
| 273 | default: |
| 274 | WARN_ON_ONCE(1); |
| 275 | val = 0; |
| 276 | } |
| 277 | return val; |
| 278 | } |
| 279 | |
| 280 | /* |
| 281 | * Show boolean, either a fault or an alarm. |
| 282 | * .nr points to the register, .index is the bit mask to check |
| 283 | */ |
| 284 | static ssize_t pem_show_bool(struct device *dev, |
| 285 | struct device_attribute *da, char *buf) |
| 286 | { |
| 287 | struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(da); |
| 288 | struct pem_data *data = pem_update_device(dev); |
| 289 | u8 status; |
| 290 | |
| 291 | if (IS_ERR(data)) |
| 292 | return PTR_ERR(data); |
| 293 | |
| 294 | status = data->data_string[attr->nr] & attr->index; |
| 295 | return snprintf(buf, PAGE_SIZE, "%d\n", !!status); |
| 296 | } |
| 297 | |
| 298 | static ssize_t pem_show_data(struct device *dev, struct device_attribute *da, |
| 299 | char *buf) |
| 300 | { |
| 301 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); |
| 302 | struct pem_data *data = pem_update_device(dev); |
| 303 | long value; |
| 304 | |
| 305 | if (IS_ERR(data)) |
| 306 | return PTR_ERR(data); |
| 307 | |
| 308 | value = pem_get_data(data->data_string, sizeof(data->data_string), |
| 309 | attr->index); |
| 310 | |
| 311 | return snprintf(buf, PAGE_SIZE, "%ld\n", value); |
| 312 | } |
| 313 | |
| 314 | static ssize_t pem_show_input(struct device *dev, struct device_attribute *da, |
| 315 | char *buf) |
| 316 | { |
| 317 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); |
| 318 | struct pem_data *data = pem_update_device(dev); |
| 319 | long value; |
| 320 | |
| 321 | if (IS_ERR(data)) |
| 322 | return PTR_ERR(data); |
| 323 | |
| 324 | value = pem_get_input(data->input_string, sizeof(data->input_string), |
| 325 | attr->index); |
| 326 | |
| 327 | return snprintf(buf, PAGE_SIZE, "%ld\n", value); |
| 328 | } |
| 329 | |
| 330 | static ssize_t pem_show_fan(struct device *dev, struct device_attribute *da, |
| 331 | char *buf) |
| 332 | { |
| 333 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); |
| 334 | struct pem_data *data = pem_update_device(dev); |
| 335 | long value; |
| 336 | |
| 337 | if (IS_ERR(data)) |
| 338 | return PTR_ERR(data); |
| 339 | |
| 340 | value = pem_get_fan(data->fan_speed, sizeof(data->fan_speed), |
| 341 | attr->index); |
| 342 | |
| 343 | return snprintf(buf, PAGE_SIZE, "%ld\n", value); |
| 344 | } |
| 345 | |
| 346 | /* Voltages */ |
| 347 | static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, pem_show_data, NULL, |
| 348 | PEM_DATA_VOUT_LSB); |
Guenter Roeck | d668a8b | 2011-03-15 16:34:07 -0700 | [diff] [blame] | 349 | static SENSOR_DEVICE_ATTR_2(in1_alarm, S_IRUGO, pem_show_bool, NULL, |
Guenter Roeck | 502b5a0 | 2010-09-29 20:12:08 -0700 | [diff] [blame] | 350 | PEM_DATA_ALARM_1, ALRM1_VOUT_OUT_LIMIT); |
| 351 | static SENSOR_DEVICE_ATTR_2(in1_crit_alarm, S_IRUGO, pem_show_bool, NULL, |
| 352 | PEM_DATA_ALARM_1, ALRM1_OV_VOLT_SHUTDOWN); |
| 353 | static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, pem_show_input, NULL, |
| 354 | PEM_INPUT_VOLTAGE); |
| 355 | static SENSOR_DEVICE_ATTR_2(in2_alarm, S_IRUGO, pem_show_bool, NULL, |
| 356 | PEM_DATA_ALARM_1, |
| 357 | ALRM1_VIN_OUT_LIMIT | ALRM1_PRIMARY_FAULT); |
| 358 | |
| 359 | /* Currents */ |
| 360 | static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, pem_show_data, NULL, |
| 361 | PEM_DATA_CURRENT); |
| 362 | static SENSOR_DEVICE_ATTR_2(curr1_alarm, S_IRUGO, pem_show_bool, NULL, |
| 363 | PEM_DATA_ALARM_1, ALRM1_VIN_OVERCURRENT); |
| 364 | |
| 365 | /* Power */ |
| 366 | static SENSOR_DEVICE_ATTR(power1_input, S_IRUGO, pem_show_input, NULL, |
| 367 | PEM_INPUT_POWER_LSB); |
| 368 | static SENSOR_DEVICE_ATTR_2(power1_alarm, S_IRUGO, pem_show_bool, NULL, |
| 369 | PEM_DATA_ALARM_1, ALRM1_POWER_LIMIT); |
| 370 | |
| 371 | /* Fans */ |
| 372 | static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, pem_show_fan, NULL, |
| 373 | PEM_FAN_FAN1); |
| 374 | static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, pem_show_fan, NULL, |
| 375 | PEM_FAN_FAN2); |
| 376 | static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, pem_show_fan, NULL, |
| 377 | PEM_FAN_FAN3); |
| 378 | static SENSOR_DEVICE_ATTR_2(fan1_alarm, S_IRUGO, pem_show_bool, NULL, |
| 379 | PEM_DATA_ALARM_2, ALRM2_FAN_FAULT); |
| 380 | |
| 381 | /* Temperatures */ |
| 382 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, pem_show_data, NULL, |
| 383 | PEM_DATA_TEMP); |
| 384 | static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, pem_show_data, NULL, |
| 385 | PEM_DATA_TEMP_MAX); |
| 386 | static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, pem_show_data, NULL, |
| 387 | PEM_DATA_TEMP_CRIT); |
| 388 | static SENSOR_DEVICE_ATTR_2(temp1_alarm, S_IRUGO, pem_show_bool, NULL, |
| 389 | PEM_DATA_ALARM_1, ALRM1_TEMP_WARNING); |
| 390 | static SENSOR_DEVICE_ATTR_2(temp1_crit_alarm, S_IRUGO, pem_show_bool, NULL, |
| 391 | PEM_DATA_ALARM_1, ALRM1_TEMP_SHUTDOWN); |
| 392 | static SENSOR_DEVICE_ATTR_2(temp1_fault, S_IRUGO, pem_show_bool, NULL, |
| 393 | PEM_DATA_ALARM_2, ALRM2_TEMP_FAULT); |
| 394 | |
| 395 | static struct attribute *pem_attributes[] = { |
| 396 | &sensor_dev_attr_in1_input.dev_attr.attr, |
Guenter Roeck | d668a8b | 2011-03-15 16:34:07 -0700 | [diff] [blame] | 397 | &sensor_dev_attr_in1_alarm.dev_attr.attr, |
Guenter Roeck | 502b5a0 | 2010-09-29 20:12:08 -0700 | [diff] [blame] | 398 | &sensor_dev_attr_in1_crit_alarm.dev_attr.attr, |
| 399 | &sensor_dev_attr_in2_alarm.dev_attr.attr, |
| 400 | |
| 401 | &sensor_dev_attr_curr1_alarm.dev_attr.attr, |
| 402 | |
| 403 | &sensor_dev_attr_power1_alarm.dev_attr.attr, |
| 404 | |
| 405 | &sensor_dev_attr_fan1_alarm.dev_attr.attr, |
| 406 | |
| 407 | &sensor_dev_attr_temp1_input.dev_attr.attr, |
| 408 | &sensor_dev_attr_temp1_max.dev_attr.attr, |
| 409 | &sensor_dev_attr_temp1_crit.dev_attr.attr, |
| 410 | &sensor_dev_attr_temp1_alarm.dev_attr.attr, |
| 411 | &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr, |
| 412 | &sensor_dev_attr_temp1_fault.dev_attr.attr, |
| 413 | |
| 414 | NULL, |
| 415 | }; |
| 416 | |
| 417 | static const struct attribute_group pem_group = { |
| 418 | .attrs = pem_attributes, |
| 419 | }; |
| 420 | |
| 421 | static struct attribute *pem_input_attributes[] = { |
| 422 | &sensor_dev_attr_in2_input.dev_attr.attr, |
| 423 | &sensor_dev_attr_curr1_input.dev_attr.attr, |
| 424 | &sensor_dev_attr_power1_input.dev_attr.attr, |
| 425 | }; |
| 426 | |
| 427 | static const struct attribute_group pem_input_group = { |
| 428 | .attrs = pem_input_attributes, |
| 429 | }; |
| 430 | |
| 431 | static struct attribute *pem_fan_attributes[] = { |
| 432 | &sensor_dev_attr_fan1_input.dev_attr.attr, |
| 433 | &sensor_dev_attr_fan2_input.dev_attr.attr, |
| 434 | &sensor_dev_attr_fan3_input.dev_attr.attr, |
| 435 | }; |
| 436 | |
| 437 | static const struct attribute_group pem_fan_group = { |
| 438 | .attrs = pem_fan_attributes, |
| 439 | }; |
| 440 | |
| 441 | static int pem_probe(struct i2c_client *client, |
| 442 | const struct i2c_device_id *id) |
| 443 | { |
| 444 | struct i2c_adapter *adapter = client->adapter; |
| 445 | struct pem_data *data; |
| 446 | int ret; |
| 447 | |
| 448 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BLOCK_DATA |
| 449 | | I2C_FUNC_SMBUS_WRITE_BYTE)) |
| 450 | return -ENODEV; |
| 451 | |
Guenter Roeck | 07404aa | 2012-02-22 08:56:45 -0800 | [diff] [blame] | 452 | data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL); |
Guenter Roeck | 502b5a0 | 2010-09-29 20:12:08 -0700 | [diff] [blame] | 453 | if (!data) |
| 454 | return -ENOMEM; |
| 455 | |
| 456 | i2c_set_clientdata(client, data); |
| 457 | mutex_init(&data->update_lock); |
| 458 | |
| 459 | /* |
| 460 | * We use the next two commands to determine if the device is really |
| 461 | * there. |
| 462 | */ |
| 463 | ret = pem_read_block(client, PEM_READ_FIRMWARE_REV, |
| 464 | data->firmware_rev, sizeof(data->firmware_rev)); |
| 465 | if (ret < 0) |
Guenter Roeck | 07404aa | 2012-02-22 08:56:45 -0800 | [diff] [blame] | 466 | return ret; |
Guenter Roeck | 502b5a0 | 2010-09-29 20:12:08 -0700 | [diff] [blame] | 467 | |
| 468 | ret = i2c_smbus_write_byte(client, PEM_CLEAR_INFO_FLAGS); |
| 469 | if (ret < 0) |
Guenter Roeck | 07404aa | 2012-02-22 08:56:45 -0800 | [diff] [blame] | 470 | return ret; |
Guenter Roeck | 502b5a0 | 2010-09-29 20:12:08 -0700 | [diff] [blame] | 471 | |
| 472 | dev_info(&client->dev, "Firmware revision %d.%d.%d\n", |
| 473 | data->firmware_rev[0], data->firmware_rev[1], |
| 474 | data->firmware_rev[2]); |
| 475 | |
| 476 | /* Register sysfs hooks */ |
| 477 | ret = sysfs_create_group(&client->dev.kobj, &pem_group); |
| 478 | if (ret) |
Guenter Roeck | 07404aa | 2012-02-22 08:56:45 -0800 | [diff] [blame] | 479 | return ret; |
Guenter Roeck | 502b5a0 | 2010-09-29 20:12:08 -0700 | [diff] [blame] | 480 | |
| 481 | /* |
| 482 | * Check if input readings are supported. |
| 483 | * This is the case if we can read input data, |
| 484 | * and if the returned data is not all zeros. |
| 485 | * Note that input alarms are always supported. |
| 486 | */ |
| 487 | ret = pem_read_block(client, PEM_READ_INPUT_STRING, |
| 488 | data->input_string, |
| 489 | sizeof(data->input_string) - 1); |
| 490 | if (!ret && (data->input_string[0] || data->input_string[1] || |
| 491 | data->input_string[2])) |
| 492 | data->input_length = sizeof(data->input_string) - 1; |
| 493 | else if (ret < 0) { |
| 494 | /* Input string is one byte longer for some devices */ |
| 495 | ret = pem_read_block(client, PEM_READ_INPUT_STRING, |
| 496 | data->input_string, |
| 497 | sizeof(data->input_string)); |
| 498 | if (!ret && (data->input_string[0] || data->input_string[1] || |
| 499 | data->input_string[2] || data->input_string[3])) |
| 500 | data->input_length = sizeof(data->input_string); |
| 501 | } |
| 502 | ret = 0; |
| 503 | if (data->input_length) { |
| 504 | ret = sysfs_create_group(&client->dev.kobj, &pem_input_group); |
| 505 | if (ret) |
| 506 | goto out_remove_groups; |
| 507 | } |
| 508 | |
| 509 | /* |
| 510 | * Check if fan speed readings are supported. |
| 511 | * This is the case if we can read fan speed data, |
| 512 | * and if the returned data is not all zeros. |
| 513 | * Note that the fan alarm is always supported. |
| 514 | */ |
| 515 | ret = pem_read_block(client, PEM_READ_FAN_SPEED, |
| 516 | data->fan_speed, |
| 517 | sizeof(data->fan_speed)); |
| 518 | if (!ret && (data->fan_speed[0] || data->fan_speed[1] || |
| 519 | data->fan_speed[2] || data->fan_speed[3])) { |
| 520 | data->fans_supported = true; |
| 521 | ret = sysfs_create_group(&client->dev.kobj, &pem_fan_group); |
| 522 | if (ret) |
| 523 | goto out_remove_groups; |
| 524 | } |
| 525 | |
| 526 | data->hwmon_dev = hwmon_device_register(&client->dev); |
| 527 | if (IS_ERR(data->hwmon_dev)) { |
| 528 | ret = PTR_ERR(data->hwmon_dev); |
| 529 | goto out_remove_groups; |
| 530 | } |
| 531 | |
| 532 | return 0; |
| 533 | |
| 534 | out_remove_groups: |
| 535 | sysfs_remove_group(&client->dev.kobj, &pem_input_group); |
| 536 | sysfs_remove_group(&client->dev.kobj, &pem_fan_group); |
| 537 | sysfs_remove_group(&client->dev.kobj, &pem_group); |
Guenter Roeck | 502b5a0 | 2010-09-29 20:12:08 -0700 | [diff] [blame] | 538 | return ret; |
| 539 | } |
| 540 | |
| 541 | static int pem_remove(struct i2c_client *client) |
| 542 | { |
| 543 | struct pem_data *data = i2c_get_clientdata(client); |
| 544 | |
| 545 | hwmon_device_unregister(data->hwmon_dev); |
| 546 | |
| 547 | sysfs_remove_group(&client->dev.kobj, &pem_input_group); |
| 548 | sysfs_remove_group(&client->dev.kobj, &pem_fan_group); |
| 549 | sysfs_remove_group(&client->dev.kobj, &pem_group); |
| 550 | |
Guenter Roeck | 502b5a0 | 2010-09-29 20:12:08 -0700 | [diff] [blame] | 551 | return 0; |
| 552 | } |
| 553 | |
| 554 | static const struct i2c_device_id pem_id[] = { |
| 555 | {"lineage_pem", 0}, |
| 556 | {} |
| 557 | }; |
| 558 | MODULE_DEVICE_TABLE(i2c, pem_id); |
| 559 | |
| 560 | static struct i2c_driver pem_driver = { |
| 561 | .driver = { |
| 562 | .name = "lineage_pem", |
| 563 | }, |
| 564 | .probe = pem_probe, |
| 565 | .remove = pem_remove, |
| 566 | .id_table = pem_id, |
| 567 | }; |
| 568 | |
Axel Lin | f0967ee | 2012-01-20 15:38:18 +0800 | [diff] [blame] | 569 | module_i2c_driver(pem_driver); |
Guenter Roeck | 502b5a0 | 2010-09-29 20:12:08 -0700 | [diff] [blame] | 570 | |
Guenter Roeck | bb9a80e | 2012-06-22 12:07:25 -0700 | [diff] [blame] | 571 | MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>"); |
Guenter Roeck | 502b5a0 | 2010-09-29 20:12:08 -0700 | [diff] [blame] | 572 | MODULE_DESCRIPTION("Lineage CPL PEM hardware monitoring driver"); |
| 573 | MODULE_LICENSE("GPL"); |