Sonic Zhang | a5d8c6b | 2010-10-27 21:44:01 -0400 | [diff] [blame^] | 1 | /* |
| 2 | * ADT7310 digital temperature sensor driver supporting ADT7310 |
| 3 | * |
| 4 | * Copyright 2010 Analog Devices Inc. |
| 5 | * |
| 6 | * Licensed under the GPL-2 or later. |
| 7 | */ |
| 8 | |
| 9 | #include <linux/interrupt.h> |
| 10 | #include <linux/gpio.h> |
| 11 | #include <linux/workqueue.h> |
| 12 | #include <linux/device.h> |
| 13 | #include <linux/kernel.h> |
| 14 | #include <linux/slab.h> |
| 15 | #include <linux/sysfs.h> |
| 16 | #include <linux/list.h> |
| 17 | #include <linux/spi/spi.h> |
| 18 | #include <linux/rtc.h> |
| 19 | |
| 20 | #include "../iio.h" |
| 21 | #include "../sysfs.h" |
| 22 | |
| 23 | /* |
| 24 | * ADT7310 registers definition |
| 25 | */ |
| 26 | |
| 27 | #define ADT7310_STATUS 0 |
| 28 | #define ADT7310_CONFIG 1 |
| 29 | #define ADT7310_TEMPERATURE 2 |
| 30 | #define ADT7310_ID 3 |
| 31 | #define ADT7310_T_CRIT 4 |
| 32 | #define ADT7310_T_HYST 5 |
| 33 | #define ADT7310_T_ALARM_HIGH 6 |
| 34 | #define ADT7310_T_ALARM_LOW 7 |
| 35 | |
| 36 | /* |
| 37 | * ADT7310 status |
| 38 | */ |
| 39 | #define ADT7310_STAT_T_LOW 0x10 |
| 40 | #define ADT7310_STAT_T_HIGH 0x20 |
| 41 | #define ADT7310_STAT_T_CRIT 0x40 |
| 42 | #define ADT7310_STAT_NOT_RDY 0x80 |
| 43 | |
| 44 | /* |
| 45 | * ADT7310 config |
| 46 | */ |
| 47 | #define ADT7310_FAULT_QUEUE_MASK 0x3 |
| 48 | #define ADT7310_CT_POLARITY 0x4 |
| 49 | #define ADT7310_INT_POLARITY 0x8 |
| 50 | #define ADT7310_EVENT_MODE 0x10 |
| 51 | #define ADT7310_MODE_MASK 0x60 |
| 52 | #define ADT7310_ONESHOT 0x20 |
| 53 | #define ADT7310_SPS 0x40 |
| 54 | #define ADT7310_PD 0x60 |
| 55 | #define ADT7310_RESOLUTION 0x80 |
| 56 | |
| 57 | /* |
| 58 | * ADT7310 masks |
| 59 | */ |
| 60 | #define ADT7310_T16_VALUE_SIGN 0x8000 |
| 61 | #define ADT7310_T16_VALUE_FLOAT_OFFSET 7 |
| 62 | #define ADT7310_T16_VALUE_FLOAT_MASK 0x7F |
| 63 | #define ADT7310_T13_VALUE_SIGN 0x1000 |
| 64 | #define ADT7310_T13_VALUE_OFFSET 3 |
| 65 | #define ADT7310_T13_VALUE_FLOAT_OFFSET 4 |
| 66 | #define ADT7310_T13_VALUE_FLOAT_MASK 0xF |
| 67 | #define ADT7310_T_HYST_MASK 0xF |
| 68 | #define ADT7310_DEVICE_ID_MASK 0x7 |
| 69 | #define ADT7310_MANUFACTORY_ID_MASK 0xF8 |
| 70 | #define ADT7310_MANUFACTORY_ID_OFFSET 3 |
| 71 | |
| 72 | |
| 73 | #define ADT7310_CMD_REG_MASK 0x28 |
| 74 | #define ADT7310_CMD_REG_OFFSET 3 |
| 75 | #define ADT7310_CMD_READ 0x40 |
| 76 | #define ADT7310_CMD_CON_READ 0x4 |
| 77 | |
| 78 | #define ADT7310_IRQS 2 |
| 79 | |
| 80 | /* |
| 81 | * struct adt7310_chip_info - chip specifc information |
| 82 | */ |
| 83 | |
| 84 | struct adt7310_chip_info { |
| 85 | const char *name; |
| 86 | struct spi_device *spi_dev; |
| 87 | struct iio_dev *indio_dev; |
| 88 | struct work_struct thresh_work; |
| 89 | s64 last_timestamp; |
| 90 | u8 config; |
| 91 | }; |
| 92 | |
| 93 | /* |
| 94 | * adt7310 register access by SPI |
| 95 | */ |
| 96 | |
| 97 | static int adt7310_spi_read_word(struct adt7310_chip_info *chip, u8 reg, u16 *data) |
| 98 | { |
| 99 | struct spi_device *spi_dev = chip->spi_dev; |
| 100 | u8 command = (reg << ADT7310_CMD_REG_OFFSET) & ADT7310_CMD_REG_MASK; |
| 101 | int ret = 0; |
| 102 | |
| 103 | command |= ADT7310_CMD_READ; |
| 104 | ret = spi_write(spi_dev, &command, sizeof(command)); |
| 105 | if (ret < 0) { |
| 106 | dev_err(&spi_dev->dev, "SPI write command error\n"); |
| 107 | return ret; |
| 108 | } |
| 109 | |
| 110 | ret = spi_read(spi_dev, (u8 *)data, sizeof(*data)); |
| 111 | if (ret < 0) { |
| 112 | dev_err(&spi_dev->dev, "SPI read word error\n"); |
| 113 | return ret; |
| 114 | } |
| 115 | |
| 116 | *data = be16_to_cpu(*data); |
| 117 | |
| 118 | return 0; |
| 119 | } |
| 120 | |
| 121 | static int adt7310_spi_write_word(struct adt7310_chip_info *chip, u8 reg, u16 data) |
| 122 | { |
| 123 | struct spi_device *spi_dev = chip->spi_dev; |
| 124 | u8 buf[3]; |
| 125 | int ret = 0; |
| 126 | |
| 127 | buf[0] = (reg << ADT7310_CMD_REG_OFFSET) & ADT7310_CMD_REG_MASK; |
| 128 | buf[1] = (u8)(data >> 8); |
| 129 | buf[2] = (u8)(data & 0xFF); |
| 130 | |
| 131 | ret = spi_write(spi_dev, buf, 3); |
| 132 | if (ret < 0) { |
| 133 | dev_err(&spi_dev->dev, "SPI write word error\n"); |
| 134 | return ret; |
| 135 | } |
| 136 | |
| 137 | return ret; |
| 138 | } |
| 139 | |
| 140 | static int adt7310_spi_read_byte(struct adt7310_chip_info *chip, u8 reg, u8 *data) |
| 141 | { |
| 142 | struct spi_device *spi_dev = chip->spi_dev; |
| 143 | u8 command = (reg << ADT7310_CMD_REG_OFFSET) & ADT7310_CMD_REG_MASK; |
| 144 | int ret = 0; |
| 145 | |
| 146 | command |= ADT7310_CMD_READ; |
| 147 | ret = spi_write(spi_dev, &command, sizeof(command)); |
| 148 | if (ret < 0) { |
| 149 | dev_err(&spi_dev->dev, "SPI write command error\n"); |
| 150 | return ret; |
| 151 | } |
| 152 | |
| 153 | ret = spi_read(spi_dev, data, sizeof(*data)); |
| 154 | if (ret < 0) { |
| 155 | dev_err(&spi_dev->dev, "SPI read byte error\n"); |
| 156 | return ret; |
| 157 | } |
| 158 | |
| 159 | return 0; |
| 160 | } |
| 161 | |
| 162 | static int adt7310_spi_write_byte(struct adt7310_chip_info *chip, u8 reg, u8 data) |
| 163 | { |
| 164 | struct spi_device *spi_dev = chip->spi_dev; |
| 165 | u8 buf[2]; |
| 166 | int ret = 0; |
| 167 | |
| 168 | buf[0] = (reg << ADT7310_CMD_REG_OFFSET) & ADT7310_CMD_REG_MASK; |
| 169 | buf[1] = data; |
| 170 | |
| 171 | ret = spi_write(spi_dev, buf, 2); |
| 172 | if (ret < 0) { |
| 173 | dev_err(&spi_dev->dev, "SPI write byte error\n"); |
| 174 | return ret; |
| 175 | } |
| 176 | |
| 177 | return ret; |
| 178 | } |
| 179 | |
| 180 | static ssize_t adt7310_show_mode(struct device *dev, |
| 181 | struct device_attribute *attr, |
| 182 | char *buf) |
| 183 | { |
| 184 | struct iio_dev *dev_info = dev_get_drvdata(dev); |
| 185 | struct adt7310_chip_info *chip = dev_info->dev_data; |
| 186 | u8 config; |
| 187 | |
| 188 | config = chip->config & ADT7310_MODE_MASK; |
| 189 | |
| 190 | switch (config) { |
| 191 | case ADT7310_PD: |
| 192 | return sprintf(buf, "power-down\n"); |
| 193 | case ADT7310_ONESHOT: |
| 194 | return sprintf(buf, "one-shot\n"); |
| 195 | case ADT7310_SPS: |
| 196 | return sprintf(buf, "sps\n"); |
| 197 | default: |
| 198 | return sprintf(buf, "full\n"); |
| 199 | } |
| 200 | } |
| 201 | |
| 202 | static ssize_t adt7310_store_mode(struct device *dev, |
| 203 | struct device_attribute *attr, |
| 204 | const char *buf, |
| 205 | size_t len) |
| 206 | { |
| 207 | struct iio_dev *dev_info = dev_get_drvdata(dev); |
| 208 | struct adt7310_chip_info *chip = dev_info->dev_data; |
| 209 | u16 config; |
| 210 | int ret; |
| 211 | |
| 212 | ret = adt7310_spi_read_byte(chip, ADT7310_CONFIG, &chip->config); |
| 213 | if (ret) |
| 214 | return -EIO; |
| 215 | |
| 216 | config = chip->config & (~ADT7310_MODE_MASK); |
| 217 | if (strcmp(buf, "power-down")) |
| 218 | config |= ADT7310_PD; |
| 219 | else if (strcmp(buf, "one-shot")) |
| 220 | config |= ADT7310_ONESHOT; |
| 221 | else if (strcmp(buf, "sps")) |
| 222 | config |= ADT7310_SPS; |
| 223 | |
| 224 | ret = adt7310_spi_write_byte(chip, ADT7310_CONFIG, config); |
| 225 | if (ret) |
| 226 | return -EIO; |
| 227 | |
| 228 | chip->config = config; |
| 229 | |
| 230 | return len; |
| 231 | } |
| 232 | |
| 233 | static IIO_DEVICE_ATTR(mode, S_IRUGO | S_IWUSR, |
| 234 | adt7310_show_mode, |
| 235 | adt7310_store_mode, |
| 236 | 0); |
| 237 | |
| 238 | static ssize_t adt7310_show_available_modes(struct device *dev, |
| 239 | struct device_attribute *attr, |
| 240 | char *buf) |
| 241 | { |
| 242 | return sprintf(buf, "full\none-shot\nsps\npower-down\n"); |
| 243 | } |
| 244 | |
| 245 | static IIO_DEVICE_ATTR(available_modes, S_IRUGO, adt7310_show_available_modes, NULL, 0); |
| 246 | |
| 247 | static ssize_t adt7310_show_resolution(struct device *dev, |
| 248 | struct device_attribute *attr, |
| 249 | char *buf) |
| 250 | { |
| 251 | struct iio_dev *dev_info = dev_get_drvdata(dev); |
| 252 | struct adt7310_chip_info *chip = dev_info->dev_data; |
| 253 | int ret; |
| 254 | int bits; |
| 255 | |
| 256 | ret = adt7310_spi_read_byte(chip, ADT7310_CONFIG, &chip->config); |
| 257 | if (ret) |
| 258 | return -EIO; |
| 259 | |
| 260 | if (chip->config & ADT7310_RESOLUTION) |
| 261 | bits = 16; |
| 262 | else |
| 263 | bits = 13; |
| 264 | |
| 265 | return sprintf(buf, "%d bits\n", bits); |
| 266 | } |
| 267 | |
| 268 | static ssize_t adt7310_store_resolution(struct device *dev, |
| 269 | struct device_attribute *attr, |
| 270 | const char *buf, |
| 271 | size_t len) |
| 272 | { |
| 273 | struct iio_dev *dev_info = dev_get_drvdata(dev); |
| 274 | struct adt7310_chip_info *chip = dev_info->dev_data; |
| 275 | unsigned long data; |
| 276 | u16 config; |
| 277 | int ret; |
| 278 | |
| 279 | ret = strict_strtoul(buf, 10, &data); |
| 280 | if (ret) |
| 281 | return -EINVAL; |
| 282 | |
| 283 | ret = adt7310_spi_read_byte(chip, ADT7310_CONFIG, &chip->config); |
| 284 | if (ret) |
| 285 | return -EIO; |
| 286 | |
| 287 | config = chip->config & (~ADT7310_RESOLUTION); |
| 288 | if (data) |
| 289 | config |= ADT7310_RESOLUTION; |
| 290 | |
| 291 | ret = adt7310_spi_write_byte(chip, ADT7310_CONFIG, config); |
| 292 | if (ret) |
| 293 | return -EIO; |
| 294 | |
| 295 | chip->config = config; |
| 296 | |
| 297 | return len; |
| 298 | } |
| 299 | |
| 300 | static IIO_DEVICE_ATTR(resolution, S_IRUGO | S_IWUSR, |
| 301 | adt7310_show_resolution, |
| 302 | adt7310_store_resolution, |
| 303 | 0); |
| 304 | |
| 305 | static ssize_t adt7310_show_id(struct device *dev, |
| 306 | struct device_attribute *attr, |
| 307 | char *buf) |
| 308 | { |
| 309 | struct iio_dev *dev_info = dev_get_drvdata(dev); |
| 310 | struct adt7310_chip_info *chip = dev_info->dev_data; |
| 311 | u8 id; |
| 312 | int ret; |
| 313 | |
| 314 | ret = adt7310_spi_read_byte(chip, ADT7310_ID, &id); |
| 315 | if (ret) |
| 316 | return -EIO; |
| 317 | |
| 318 | return sprintf(buf, "device id: 0x%x\nmanufactory id: 0x%x\n", |
| 319 | id & ADT7310_DEVICE_ID_MASK, |
| 320 | (id & ADT7310_MANUFACTORY_ID_MASK) >> ADT7310_MANUFACTORY_ID_OFFSET); |
| 321 | } |
| 322 | |
| 323 | static IIO_DEVICE_ATTR(id, S_IRUGO | S_IWUSR, |
| 324 | adt7310_show_id, |
| 325 | NULL, |
| 326 | 0); |
| 327 | |
| 328 | static ssize_t adt7310_convert_temperature(struct adt7310_chip_info *chip, |
| 329 | u16 data, char *buf) |
| 330 | { |
| 331 | char sign = ' '; |
| 332 | |
| 333 | if (chip->config & ADT7310_RESOLUTION) { |
| 334 | if (data & ADT7310_T16_VALUE_SIGN) { |
| 335 | /* convert supplement to positive value */ |
| 336 | data = (u16)((ADT7310_T16_VALUE_SIGN << 1) - (u32)data); |
| 337 | sign = '-'; |
| 338 | } |
| 339 | return sprintf(buf, "%c%d.%.7d\n", sign, |
| 340 | (data >> ADT7310_T16_VALUE_FLOAT_OFFSET), |
| 341 | (data & ADT7310_T16_VALUE_FLOAT_MASK) * 78125); |
| 342 | } else { |
| 343 | if (data & ADT7310_T13_VALUE_SIGN) { |
| 344 | /* convert supplement to positive value */ |
| 345 | data >>= ADT7310_T13_VALUE_OFFSET; |
| 346 | data = (ADT7310_T13_VALUE_SIGN << 1) - data; |
| 347 | sign = '-'; |
| 348 | } |
| 349 | return sprintf(buf, "%c%d.%.4d\n", sign, |
| 350 | (data >> ADT7310_T13_VALUE_FLOAT_OFFSET), |
| 351 | (data & ADT7310_T13_VALUE_FLOAT_MASK) * 625); |
| 352 | } |
| 353 | } |
| 354 | |
| 355 | static ssize_t adt7310_show_value(struct device *dev, |
| 356 | struct device_attribute *attr, |
| 357 | char *buf) |
| 358 | { |
| 359 | struct iio_dev *dev_info = dev_get_drvdata(dev); |
| 360 | struct adt7310_chip_info *chip = dev_info->dev_data; |
| 361 | u8 status; |
| 362 | u16 data; |
| 363 | int ret, i = 0; |
| 364 | |
| 365 | do { |
| 366 | ret = adt7310_spi_read_byte(chip, ADT7310_STATUS, &status); |
| 367 | if (ret) |
| 368 | return -EIO; |
| 369 | i++; |
| 370 | if (i == 10000) |
| 371 | return -EIO; |
| 372 | } while (status & ADT7310_STAT_NOT_RDY); |
| 373 | |
| 374 | ret = adt7310_spi_read_word(chip, ADT7310_TEMPERATURE, &data); |
| 375 | if (ret) |
| 376 | return -EIO; |
| 377 | |
| 378 | return adt7310_convert_temperature(chip, data, buf); |
| 379 | } |
| 380 | |
| 381 | static IIO_DEVICE_ATTR(value, S_IRUGO, adt7310_show_value, NULL, 0); |
| 382 | |
| 383 | static ssize_t adt7310_show_name(struct device *dev, |
| 384 | struct device_attribute *attr, |
| 385 | char *buf) |
| 386 | { |
| 387 | struct iio_dev *dev_info = dev_get_drvdata(dev); |
| 388 | struct adt7310_chip_info *chip = dev_info->dev_data; |
| 389 | return sprintf(buf, "%s\n", chip->name); |
| 390 | } |
| 391 | |
| 392 | static IIO_DEVICE_ATTR(name, S_IRUGO, adt7310_show_name, NULL, 0); |
| 393 | |
| 394 | static struct attribute *adt7310_attributes[] = { |
| 395 | &iio_dev_attr_available_modes.dev_attr.attr, |
| 396 | &iio_dev_attr_mode.dev_attr.attr, |
| 397 | &iio_dev_attr_resolution.dev_attr.attr, |
| 398 | &iio_dev_attr_id.dev_attr.attr, |
| 399 | &iio_dev_attr_value.dev_attr.attr, |
| 400 | &iio_dev_attr_name.dev_attr.attr, |
| 401 | NULL, |
| 402 | }; |
| 403 | |
| 404 | static const struct attribute_group adt7310_attribute_group = { |
| 405 | .attrs = adt7310_attributes, |
| 406 | }; |
| 407 | |
| 408 | /* |
| 409 | * temperature bound events |
| 410 | */ |
| 411 | |
| 412 | #define IIO_EVENT_CODE_ADT7310_ABOVE_ALARM IIO_BUFFER_EVENT_CODE(0) |
| 413 | #define IIO_EVENT_CODE_ADT7310_BELLOW_ALARM IIO_BUFFER_EVENT_CODE(1) |
| 414 | #define IIO_EVENT_CODE_ADT7310_ABOVE_CRIT IIO_BUFFER_EVENT_CODE(2) |
| 415 | |
| 416 | static void adt7310_interrupt_bh(struct work_struct *work_s) |
| 417 | { |
| 418 | struct adt7310_chip_info *chip = |
| 419 | container_of(work_s, struct adt7310_chip_info, thresh_work); |
| 420 | u8 status; |
| 421 | |
| 422 | if (adt7310_spi_read_byte(chip, ADT7310_STATUS, &status)) |
| 423 | return; |
| 424 | |
| 425 | if (status & ADT7310_STAT_T_HIGH) |
| 426 | iio_push_event(chip->indio_dev, 0, |
| 427 | IIO_EVENT_CODE_ADT7310_ABOVE_ALARM, |
| 428 | chip->last_timestamp); |
| 429 | if (status & ADT7310_STAT_T_LOW) |
| 430 | iio_push_event(chip->indio_dev, 0, |
| 431 | IIO_EVENT_CODE_ADT7310_BELLOW_ALARM, |
| 432 | chip->last_timestamp); |
| 433 | if (status & ADT7310_STAT_T_CRIT) |
| 434 | iio_push_event(chip->indio_dev, 0, |
| 435 | IIO_EVENT_CODE_ADT7310_ABOVE_CRIT, |
| 436 | chip->last_timestamp); |
| 437 | } |
| 438 | |
| 439 | static int adt7310_interrupt(struct iio_dev *dev_info, |
| 440 | int index, |
| 441 | s64 timestamp, |
| 442 | int no_test) |
| 443 | { |
| 444 | struct adt7310_chip_info *chip = dev_info->dev_data; |
| 445 | |
| 446 | chip->last_timestamp = timestamp; |
| 447 | schedule_work(&chip->thresh_work); |
| 448 | |
| 449 | return 0; |
| 450 | } |
| 451 | |
| 452 | IIO_EVENT_SH(adt7310, &adt7310_interrupt); |
| 453 | IIO_EVENT_SH(adt7310_ct, &adt7310_interrupt); |
| 454 | |
| 455 | static ssize_t adt7310_show_event_mode(struct device *dev, |
| 456 | struct device_attribute *attr, |
| 457 | char *buf) |
| 458 | { |
| 459 | struct iio_dev *dev_info = dev_get_drvdata(dev); |
| 460 | struct adt7310_chip_info *chip = dev_info->dev_data; |
| 461 | int ret; |
| 462 | |
| 463 | ret = adt7310_spi_read_byte(chip, ADT7310_CONFIG, &chip->config); |
| 464 | if (ret) |
| 465 | return -EIO; |
| 466 | |
| 467 | if (chip->config & ADT7310_EVENT_MODE) |
| 468 | return sprintf(buf, "interrupt\n"); |
| 469 | else |
| 470 | return sprintf(buf, "comparator\n"); |
| 471 | } |
| 472 | |
| 473 | static ssize_t adt7310_set_event_mode(struct device *dev, |
| 474 | struct device_attribute *attr, |
| 475 | const char *buf, |
| 476 | size_t len) |
| 477 | { |
| 478 | struct iio_dev *dev_info = dev_get_drvdata(dev); |
| 479 | struct adt7310_chip_info *chip = dev_info->dev_data; |
| 480 | u16 config; |
| 481 | int ret; |
| 482 | |
| 483 | ret = adt7310_spi_read_byte(chip, ADT7310_CONFIG, &chip->config); |
| 484 | if (ret) |
| 485 | return -EIO; |
| 486 | |
| 487 | config = chip->config &= ~ADT7310_EVENT_MODE; |
| 488 | if (strcmp(buf, "comparator") != 0) |
| 489 | config |= ADT7310_EVENT_MODE; |
| 490 | |
| 491 | ret = adt7310_spi_write_byte(chip, ADT7310_CONFIG, config); |
| 492 | if (ret) |
| 493 | return -EIO; |
| 494 | |
| 495 | chip->config = config; |
| 496 | |
| 497 | return len; |
| 498 | } |
| 499 | |
| 500 | static ssize_t adt7310_show_available_event_modes(struct device *dev, |
| 501 | struct device_attribute *attr, |
| 502 | char *buf) |
| 503 | { |
| 504 | return sprintf(buf, "comparator\ninterrupt\n"); |
| 505 | } |
| 506 | |
| 507 | static ssize_t adt7310_show_fault_queue(struct device *dev, |
| 508 | struct device_attribute *attr, |
| 509 | char *buf) |
| 510 | { |
| 511 | struct iio_dev *dev_info = dev_get_drvdata(dev); |
| 512 | struct adt7310_chip_info *chip = dev_info->dev_data; |
| 513 | int ret; |
| 514 | |
| 515 | ret = adt7310_spi_read_byte(chip, ADT7310_CONFIG, &chip->config); |
| 516 | if (ret) |
| 517 | return -EIO; |
| 518 | |
| 519 | return sprintf(buf, "%d\n", chip->config & ADT7310_FAULT_QUEUE_MASK); |
| 520 | } |
| 521 | |
| 522 | static ssize_t adt7310_set_fault_queue(struct device *dev, |
| 523 | struct device_attribute *attr, |
| 524 | const char *buf, |
| 525 | size_t len) |
| 526 | { |
| 527 | struct iio_dev *dev_info = dev_get_drvdata(dev); |
| 528 | struct adt7310_chip_info *chip = dev_info->dev_data; |
| 529 | unsigned long data; |
| 530 | int ret; |
| 531 | u8 config; |
| 532 | |
| 533 | ret = strict_strtoul(buf, 10, &data); |
| 534 | if (ret || data > 3) |
| 535 | return -EINVAL; |
| 536 | |
| 537 | ret = adt7310_spi_read_byte(chip, ADT7310_CONFIG, &chip->config); |
| 538 | if (ret) |
| 539 | return -EIO; |
| 540 | |
| 541 | config = chip->config & ~ADT7310_FAULT_QUEUE_MASK; |
| 542 | config |= data; |
| 543 | ret = adt7310_spi_write_byte(chip, ADT7310_CONFIG, config); |
| 544 | if (ret) |
| 545 | return -EIO; |
| 546 | |
| 547 | chip->config = config; |
| 548 | |
| 549 | return len; |
| 550 | } |
| 551 | |
| 552 | static inline ssize_t adt7310_show_t_bound(struct device *dev, |
| 553 | struct device_attribute *attr, |
| 554 | u8 bound_reg, |
| 555 | char *buf) |
| 556 | { |
| 557 | struct iio_dev *dev_info = dev_get_drvdata(dev); |
| 558 | struct adt7310_chip_info *chip = dev_info->dev_data; |
| 559 | u16 data; |
| 560 | int ret; |
| 561 | |
| 562 | ret = adt7310_spi_read_word(chip, bound_reg, &data); |
| 563 | if (ret) |
| 564 | return -EIO; |
| 565 | |
| 566 | return adt7310_convert_temperature(chip, data, buf); |
| 567 | } |
| 568 | |
| 569 | static inline ssize_t adt7310_set_t_bound(struct device *dev, |
| 570 | struct device_attribute *attr, |
| 571 | u8 bound_reg, |
| 572 | const char *buf, |
| 573 | size_t len) |
| 574 | { |
| 575 | struct iio_dev *dev_info = dev_get_drvdata(dev); |
| 576 | struct adt7310_chip_info *chip = dev_info->dev_data; |
| 577 | long tmp1, tmp2; |
| 578 | u16 data; |
| 579 | char *pos; |
| 580 | int ret; |
| 581 | |
| 582 | pos = strchr(buf, '.'); |
| 583 | |
| 584 | ret = strict_strtol(buf, 10, &tmp1); |
| 585 | |
| 586 | if (ret || tmp1 > 127 || tmp1 < -128) |
| 587 | return -EINVAL; |
| 588 | |
| 589 | if (pos) { |
| 590 | len = strlen(pos); |
| 591 | |
| 592 | if (chip->config & ADT7310_RESOLUTION) { |
| 593 | if (len > ADT7310_T16_VALUE_FLOAT_OFFSET) |
| 594 | len = ADT7310_T16_VALUE_FLOAT_OFFSET; |
| 595 | pos[len] = 0; |
| 596 | ret = strict_strtol(pos, 10, &tmp2); |
| 597 | |
| 598 | if (!ret) |
| 599 | tmp2 = (tmp2 / 78125) * 78125; |
| 600 | } else { |
| 601 | if (len > ADT7310_T13_VALUE_FLOAT_OFFSET) |
| 602 | len = ADT7310_T13_VALUE_FLOAT_OFFSET; |
| 603 | pos[len] = 0; |
| 604 | ret = strict_strtol(pos, 10, &tmp2); |
| 605 | |
| 606 | if (!ret) |
| 607 | tmp2 = (tmp2 / 625) * 625; |
| 608 | } |
| 609 | } |
| 610 | |
| 611 | if (tmp1 < 0) |
| 612 | data = (u16)(-tmp1); |
| 613 | else |
| 614 | data = (u16)tmp1; |
| 615 | |
| 616 | if (chip->config & ADT7310_RESOLUTION) { |
| 617 | data = (data << ADT7310_T16_VALUE_FLOAT_OFFSET) | |
| 618 | (tmp2 & ADT7310_T16_VALUE_FLOAT_MASK); |
| 619 | |
| 620 | if (tmp1 < 0) |
| 621 | /* convert positive value to supplyment */ |
| 622 | data = (u16)((ADT7310_T16_VALUE_SIGN << 1) - (u32)data); |
| 623 | } else { |
| 624 | data = (data << ADT7310_T13_VALUE_FLOAT_OFFSET) | |
| 625 | (tmp2 & ADT7310_T13_VALUE_FLOAT_MASK); |
| 626 | |
| 627 | if (tmp1 < 0) |
| 628 | /* convert positive value to supplyment */ |
| 629 | data = (ADT7310_T13_VALUE_SIGN << 1) - data; |
| 630 | data <<= ADT7310_T13_VALUE_OFFSET; |
| 631 | } |
| 632 | |
| 633 | ret = adt7310_spi_write_word(chip, bound_reg, data); |
| 634 | if (ret) |
| 635 | return -EIO; |
| 636 | |
| 637 | return len; |
| 638 | } |
| 639 | |
| 640 | static ssize_t adt7310_show_t_alarm_high(struct device *dev, |
| 641 | struct device_attribute *attr, |
| 642 | char *buf) |
| 643 | { |
| 644 | return adt7310_show_t_bound(dev, attr, |
| 645 | ADT7310_T_ALARM_HIGH, buf); |
| 646 | } |
| 647 | |
| 648 | static inline ssize_t adt7310_set_t_alarm_high(struct device *dev, |
| 649 | struct device_attribute *attr, |
| 650 | const char *buf, |
| 651 | size_t len) |
| 652 | { |
| 653 | return adt7310_set_t_bound(dev, attr, |
| 654 | ADT7310_T_ALARM_HIGH, buf, len); |
| 655 | } |
| 656 | |
| 657 | static ssize_t adt7310_show_t_alarm_low(struct device *dev, |
| 658 | struct device_attribute *attr, |
| 659 | char *buf) |
| 660 | { |
| 661 | return adt7310_show_t_bound(dev, attr, |
| 662 | ADT7310_T_ALARM_LOW, buf); |
| 663 | } |
| 664 | |
| 665 | static inline ssize_t adt7310_set_t_alarm_low(struct device *dev, |
| 666 | struct device_attribute *attr, |
| 667 | const char *buf, |
| 668 | size_t len) |
| 669 | { |
| 670 | return adt7310_set_t_bound(dev, attr, |
| 671 | ADT7310_T_ALARM_LOW, buf, len); |
| 672 | } |
| 673 | |
| 674 | static ssize_t adt7310_show_t_crit(struct device *dev, |
| 675 | struct device_attribute *attr, |
| 676 | char *buf) |
| 677 | { |
| 678 | return adt7310_show_t_bound(dev, attr, |
| 679 | ADT7310_T_CRIT, buf); |
| 680 | } |
| 681 | |
| 682 | static inline ssize_t adt7310_set_t_crit(struct device *dev, |
| 683 | struct device_attribute *attr, |
| 684 | const char *buf, |
| 685 | size_t len) |
| 686 | { |
| 687 | return adt7310_set_t_bound(dev, attr, |
| 688 | ADT7310_T_CRIT, buf, len); |
| 689 | } |
| 690 | |
| 691 | static ssize_t adt7310_show_t_hyst(struct device *dev, |
| 692 | struct device_attribute *attr, |
| 693 | char *buf) |
| 694 | { |
| 695 | struct iio_dev *dev_info = dev_get_drvdata(dev); |
| 696 | struct adt7310_chip_info *chip = dev_info->dev_data; |
| 697 | int ret; |
| 698 | u8 t_hyst; |
| 699 | |
| 700 | ret = adt7310_spi_read_byte(chip, ADT7310_T_HYST, &t_hyst); |
| 701 | if (ret) |
| 702 | return -EIO; |
| 703 | |
| 704 | return sprintf(buf, "%d\n", t_hyst & ADT7310_T_HYST_MASK); |
| 705 | } |
| 706 | |
| 707 | static inline ssize_t adt7310_set_t_hyst(struct device *dev, |
| 708 | struct device_attribute *attr, |
| 709 | const char *buf, |
| 710 | size_t len) |
| 711 | { |
| 712 | struct iio_dev *dev_info = dev_get_drvdata(dev); |
| 713 | struct adt7310_chip_info *chip = dev_info->dev_data; |
| 714 | int ret; |
| 715 | unsigned long data; |
| 716 | u8 t_hyst; |
| 717 | |
| 718 | ret = strict_strtol(buf, 10, &data); |
| 719 | |
| 720 | if (ret || data > ADT7310_T_HYST_MASK) |
| 721 | return -EINVAL; |
| 722 | |
| 723 | t_hyst = (u8)data; |
| 724 | |
| 725 | ret = adt7310_spi_write_byte(chip, ADT7310_T_HYST, t_hyst); |
| 726 | if (ret) |
| 727 | return -EIO; |
| 728 | |
| 729 | return len; |
| 730 | } |
| 731 | |
| 732 | IIO_EVENT_ATTR_SH(event_mode, iio_event_adt7310, |
| 733 | adt7310_show_event_mode, adt7310_set_event_mode, 0); |
| 734 | IIO_EVENT_ATTR_SH(available_event_modes, iio_event_adt7310, |
| 735 | adt7310_show_available_event_modes, NULL, 0); |
| 736 | IIO_EVENT_ATTR_SH(fault_queue, iio_event_adt7310, |
| 737 | adt7310_show_fault_queue, adt7310_set_fault_queue, 0); |
| 738 | IIO_EVENT_ATTR_SH(t_alarm_high, iio_event_adt7310, |
| 739 | adt7310_show_t_alarm_high, adt7310_set_t_alarm_high, 0); |
| 740 | IIO_EVENT_ATTR_SH(t_alarm_low, iio_event_adt7310, |
| 741 | adt7310_show_t_alarm_low, adt7310_set_t_alarm_low, 0); |
| 742 | IIO_EVENT_ATTR_SH(t_crit, iio_event_adt7310_ct, |
| 743 | adt7310_show_t_crit, adt7310_set_t_crit, 0); |
| 744 | IIO_EVENT_ATTR_SH(t_hyst, iio_event_adt7310, |
| 745 | adt7310_show_t_hyst, adt7310_set_t_hyst, 0); |
| 746 | |
| 747 | static struct attribute *adt7310_event_int_attributes[] = { |
| 748 | &iio_event_attr_event_mode.dev_attr.attr, |
| 749 | &iio_event_attr_available_event_modes.dev_attr.attr, |
| 750 | &iio_event_attr_fault_queue.dev_attr.attr, |
| 751 | &iio_event_attr_t_alarm_high.dev_attr.attr, |
| 752 | &iio_event_attr_t_alarm_low.dev_attr.attr, |
| 753 | &iio_event_attr_t_hyst.dev_attr.attr, |
| 754 | NULL, |
| 755 | }; |
| 756 | |
| 757 | static struct attribute *adt7310_event_ct_attributes[] = { |
| 758 | &iio_event_attr_event_mode.dev_attr.attr, |
| 759 | &iio_event_attr_available_event_modes.dev_attr.attr, |
| 760 | &iio_event_attr_fault_queue.dev_attr.attr, |
| 761 | &iio_event_attr_t_crit.dev_attr.attr, |
| 762 | &iio_event_attr_t_hyst.dev_attr.attr, |
| 763 | NULL, |
| 764 | }; |
| 765 | |
| 766 | static struct attribute_group adt7310_event_attribute_group[ADT7310_IRQS] = { |
| 767 | { |
| 768 | .attrs = adt7310_event_int_attributes, |
| 769 | }, |
| 770 | { |
| 771 | .attrs = adt7310_event_ct_attributes, |
| 772 | } |
| 773 | }; |
| 774 | |
| 775 | /* |
| 776 | * device probe and remove |
| 777 | */ |
| 778 | |
| 779 | static int __devinit adt7310_probe(struct spi_device *spi_dev) |
| 780 | { |
| 781 | struct adt7310_chip_info *chip; |
| 782 | int ret = 0; |
| 783 | unsigned long *adt7310_platform_data = spi_dev->dev.platform_data; |
| 784 | unsigned long irq_flags; |
| 785 | |
| 786 | chip = kzalloc(sizeof(struct adt7310_chip_info), GFP_KERNEL); |
| 787 | |
| 788 | if (chip == NULL) |
| 789 | return -ENOMEM; |
| 790 | |
| 791 | /* this is only used for device removal purposes */ |
| 792 | dev_set_drvdata(&spi_dev->dev, chip); |
| 793 | |
| 794 | chip->spi_dev = spi_dev; |
| 795 | chip->name = spi_dev->modalias; |
| 796 | |
| 797 | chip->indio_dev = iio_allocate_device(); |
| 798 | if (chip->indio_dev == NULL) { |
| 799 | ret = -ENOMEM; |
| 800 | goto error_free_chip; |
| 801 | } |
| 802 | |
| 803 | chip->indio_dev->dev.parent = &spi_dev->dev; |
| 804 | chip->indio_dev->attrs = &adt7310_attribute_group; |
| 805 | chip->indio_dev->event_attrs = adt7310_event_attribute_group; |
| 806 | chip->indio_dev->dev_data = (void *)chip; |
| 807 | chip->indio_dev->driver_module = THIS_MODULE; |
| 808 | chip->indio_dev->num_interrupt_lines = ADT7310_IRQS; |
| 809 | chip->indio_dev->modes = INDIO_DIRECT_MODE; |
| 810 | |
| 811 | ret = iio_device_register(chip->indio_dev); |
| 812 | if (ret) |
| 813 | goto error_free_dev; |
| 814 | |
| 815 | /* CT critcal temperature event. line 0 */ |
| 816 | if (spi_dev->irq) { |
| 817 | if (adt7310_platform_data[2]) |
| 818 | irq_flags = adt7310_platform_data[2]; |
| 819 | else |
| 820 | irq_flags = IRQF_TRIGGER_LOW; |
| 821 | ret = iio_register_interrupt_line(spi_dev->irq, |
| 822 | chip->indio_dev, |
| 823 | 0, |
| 824 | irq_flags, |
| 825 | chip->name); |
| 826 | if (ret) |
| 827 | goto error_unreg_dev; |
| 828 | |
| 829 | /* |
| 830 | * The event handler list element refer to iio_event_adt7310. |
| 831 | * All event attributes bind to the same event handler. |
| 832 | * One event handler can only be added to one event list. |
| 833 | */ |
| 834 | iio_add_event_to_list(&iio_event_adt7310, |
| 835 | &chip->indio_dev->interrupts[0]->ev_list); |
| 836 | } |
| 837 | |
| 838 | /* INT bound temperature alarm event. line 1 */ |
| 839 | if (adt7310_platform_data[0]) { |
| 840 | ret = iio_register_interrupt_line(adt7310_platform_data[0], |
| 841 | chip->indio_dev, |
| 842 | 1, |
| 843 | adt7310_platform_data[1], |
| 844 | chip->name); |
| 845 | if (ret) |
| 846 | goto error_unreg_ct_irq; |
| 847 | |
| 848 | /* |
| 849 | * The event handler list element refer to iio_event_adt7310. |
| 850 | * All event attributes bind to the same event handler. |
| 851 | * One event handler can only be added to one event list. |
| 852 | */ |
| 853 | iio_add_event_to_list(&iio_event_adt7310_ct, |
| 854 | &chip->indio_dev->interrupts[1]->ev_list); |
| 855 | } |
| 856 | |
| 857 | if (spi_dev->irq && adt7310_platform_data[0]) { |
| 858 | INIT_WORK(&chip->thresh_work, adt7310_interrupt_bh); |
| 859 | |
| 860 | ret = adt7310_spi_read_byte(chip, ADT7310_CONFIG, &chip->config); |
| 861 | if (ret) { |
| 862 | ret = -EIO; |
| 863 | goto error_unreg_int_irq; |
| 864 | } |
| 865 | |
| 866 | /* set irq polarity low level */ |
| 867 | chip->config &= ~ADT7310_CT_POLARITY; |
| 868 | |
| 869 | if (adt7310_platform_data[1] & IRQF_TRIGGER_HIGH) |
| 870 | chip->config |= ADT7310_INT_POLARITY; |
| 871 | else |
| 872 | chip->config &= ~ADT7310_INT_POLARITY; |
| 873 | |
| 874 | ret = adt7310_spi_write_byte(chip, ADT7310_CONFIG, chip->config); |
| 875 | if (ret) { |
| 876 | ret = -EIO; |
| 877 | goto error_unreg_int_irq; |
| 878 | } |
| 879 | } |
| 880 | |
| 881 | dev_info(&spi_dev->dev, "%s temperature sensor registered.\n", |
| 882 | chip->name); |
| 883 | |
| 884 | return 0; |
| 885 | |
| 886 | error_unreg_int_irq: |
| 887 | iio_unregister_interrupt_line(chip->indio_dev, 1); |
| 888 | error_unreg_ct_irq: |
| 889 | iio_unregister_interrupt_line(chip->indio_dev, 0); |
| 890 | error_unreg_dev: |
| 891 | iio_device_unregister(chip->indio_dev); |
| 892 | error_free_dev: |
| 893 | iio_free_device(chip->indio_dev); |
| 894 | error_free_chip: |
| 895 | kfree(chip); |
| 896 | |
| 897 | return ret; |
| 898 | } |
| 899 | |
| 900 | static int __devexit adt7310_remove(struct spi_device *spi_dev) |
| 901 | { |
| 902 | struct adt7310_chip_info *chip = dev_get_drvdata(&spi_dev->dev); |
| 903 | struct iio_dev *indio_dev = chip->indio_dev; |
| 904 | unsigned long *adt7310_platform_data = spi_dev->dev.platform_data; |
| 905 | |
| 906 | dev_set_drvdata(&spi_dev->dev, NULL); |
| 907 | if (adt7310_platform_data[0]) |
| 908 | iio_unregister_interrupt_line(indio_dev, 1); |
| 909 | if (spi_dev->irq) |
| 910 | iio_unregister_interrupt_line(indio_dev, 0); |
| 911 | iio_device_unregister(indio_dev); |
| 912 | iio_free_device(chip->indio_dev); |
| 913 | kfree(chip); |
| 914 | |
| 915 | return 0; |
| 916 | } |
| 917 | |
| 918 | static const struct spi_device_id adt7310_id[] = { |
| 919 | { "adt7310", 0 }, |
| 920 | {} |
| 921 | }; |
| 922 | |
| 923 | MODULE_DEVICE_TABLE(spi, adt7310_id); |
| 924 | |
| 925 | static struct spi_driver adt7310_driver = { |
| 926 | .driver = { |
| 927 | .name = "adt7310", |
| 928 | .bus = &spi_bus_type, |
| 929 | .owner = THIS_MODULE, |
| 930 | }, |
| 931 | .probe = adt7310_probe, |
| 932 | .remove = __devexit_p(adt7310_remove), |
| 933 | .id_table = adt7310_id, |
| 934 | }; |
| 935 | |
| 936 | static __init int adt7310_init(void) |
| 937 | { |
| 938 | return spi_register_driver(&adt7310_driver); |
| 939 | } |
| 940 | |
| 941 | static __exit void adt7310_exit(void) |
| 942 | { |
| 943 | spi_unregister_driver(&adt7310_driver); |
| 944 | } |
| 945 | |
| 946 | MODULE_AUTHOR("Sonic Zhang <sonic.zhang@analog.com>"); |
| 947 | MODULE_DESCRIPTION("Analog Devices ADT7310 digital" |
| 948 | " temperature sensor driver"); |
| 949 | MODULE_LICENSE("GPL v2"); |
| 950 | |
| 951 | module_init(adt7310_init); |
| 952 | module_exit(adt7310_exit); |