Sonic Zhang | 7924425 | 2010-10-27 21:43:59 -0400 | [diff] [blame] | 1 | /* |
| 2 | * AD7816 digital temperature sensor driver supporting AD7816/7/8 |
| 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> |
Sonic Zhang | 7924425 | 2010-10-27 21:43:59 -0400 | [diff] [blame] | 11 | #include <linux/device.h> |
| 12 | #include <linux/kernel.h> |
| 13 | #include <linux/slab.h> |
| 14 | #include <linux/sysfs.h> |
| 15 | #include <linux/list.h> |
| 16 | #include <linux/spi/spi.h> |
Paul Gortmaker | 99c9785 | 2011-07-03 15:49:50 -0400 | [diff] [blame] | 17 | #include <linux/module.h> |
Sonic Zhang | 7924425 | 2010-10-27 21:43:59 -0400 | [diff] [blame] | 18 | |
Jonathan Cameron | 06458e2 | 2012-04-25 15:54:58 +0100 | [diff] [blame] | 19 | #include <linux/iio/iio.h> |
| 20 | #include <linux/iio/sysfs.h> |
| 21 | #include <linux/iio/events.h> |
Sonic Zhang | 7924425 | 2010-10-27 21:43:59 -0400 | [diff] [blame] | 22 | |
| 23 | /* |
| 24 | * AD7816 config masks |
| 25 | */ |
| 26 | #define AD7816_FULL 0x1 |
| 27 | #define AD7816_PD 0x2 |
| 28 | #define AD7816_CS_MASK 0x7 |
| 29 | #define AD7816_CS_MAX 0x4 |
| 30 | |
| 31 | /* |
| 32 | * AD7816 temperature masks |
| 33 | */ |
| 34 | #define AD7816_VALUE_OFFSET 6 |
| 35 | #define AD7816_BOUND_VALUE_BASE 0x8 |
| 36 | #define AD7816_BOUND_VALUE_MIN -95 |
| 37 | #define AD7816_BOUND_VALUE_MAX 152 |
| 38 | #define AD7816_TEMP_FLOAT_OFFSET 2 |
| 39 | #define AD7816_TEMP_FLOAT_MASK 0x3 |
| 40 | |
| 41 | |
| 42 | /* |
| 43 | * struct ad7816_chip_info - chip specifc information |
| 44 | */ |
| 45 | |
| 46 | struct ad7816_chip_info { |
Sonic Zhang | 7924425 | 2010-10-27 21:43:59 -0400 | [diff] [blame] | 47 | struct spi_device *spi_dev; |
Sonic Zhang | 7924425 | 2010-10-27 21:43:59 -0400 | [diff] [blame] | 48 | u16 rdwr_pin; |
| 49 | u16 convert_pin; |
| 50 | u16 busy_pin; |
| 51 | u8 oti_data[AD7816_CS_MAX+1]; |
| 52 | u8 channel_id; /* 0 always be temperature */ |
| 53 | u8 mode; |
| 54 | }; |
| 55 | |
| 56 | /* |
| 57 | * ad7816 data access by SPI |
| 58 | */ |
| 59 | static int ad7816_spi_read(struct ad7816_chip_info *chip, u16 *data) |
| 60 | { |
| 61 | struct spi_device *spi_dev = chip->spi_dev; |
| 62 | int ret = 0; |
| 63 | |
| 64 | gpio_set_value(chip->rdwr_pin, 1); |
| 65 | gpio_set_value(chip->rdwr_pin, 0); |
| 66 | ret = spi_write(spi_dev, &chip->channel_id, sizeof(chip->channel_id)); |
| 67 | if (ret < 0) { |
| 68 | dev_err(&spi_dev->dev, "SPI channel setting error\n"); |
| 69 | return ret; |
| 70 | } |
| 71 | gpio_set_value(chip->rdwr_pin, 1); |
| 72 | |
| 73 | |
| 74 | if (chip->mode == AD7816_PD) { /* operating mode 2 */ |
| 75 | gpio_set_value(chip->convert_pin, 1); |
| 76 | gpio_set_value(chip->convert_pin, 0); |
| 77 | } else { /* operating mode 1 */ |
| 78 | gpio_set_value(chip->convert_pin, 0); |
| 79 | gpio_set_value(chip->convert_pin, 1); |
| 80 | } |
| 81 | |
| 82 | while (gpio_get_value(chip->busy_pin)) |
| 83 | cpu_relax(); |
| 84 | |
| 85 | gpio_set_value(chip->rdwr_pin, 0); |
| 86 | gpio_set_value(chip->rdwr_pin, 1); |
| 87 | ret = spi_read(spi_dev, (u8 *)data, sizeof(*data)); |
| 88 | if (ret < 0) { |
| 89 | dev_err(&spi_dev->dev, "SPI data read error\n"); |
| 90 | return ret; |
| 91 | } |
| 92 | |
| 93 | *data = be16_to_cpu(*data); |
| 94 | |
| 95 | return ret; |
| 96 | } |
| 97 | |
| 98 | static int ad7816_spi_write(struct ad7816_chip_info *chip, u8 data) |
| 99 | { |
| 100 | struct spi_device *spi_dev = chip->spi_dev; |
| 101 | int ret = 0; |
| 102 | |
| 103 | gpio_set_value(chip->rdwr_pin, 1); |
| 104 | gpio_set_value(chip->rdwr_pin, 0); |
| 105 | ret = spi_write(spi_dev, &data, sizeof(data)); |
| 106 | if (ret < 0) |
| 107 | dev_err(&spi_dev->dev, "SPI oti data write error\n"); |
| 108 | |
| 109 | return ret; |
| 110 | } |
| 111 | |
| 112 | static ssize_t ad7816_show_mode(struct device *dev, |
| 113 | struct device_attribute *attr, |
| 114 | char *buf) |
| 115 | { |
Lars-Peter Clausen | 62c5183 | 2012-05-12 15:39:42 +0200 | [diff] [blame] | 116 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
Jonathan Cameron | 84f79ec | 2011-10-06 17:14:37 +0100 | [diff] [blame] | 117 | struct ad7816_chip_info *chip = iio_priv(indio_dev); |
Sonic Zhang | 7924425 | 2010-10-27 21:43:59 -0400 | [diff] [blame] | 118 | |
| 119 | if (chip->mode) |
| 120 | return sprintf(buf, "power-save\n"); |
| 121 | else |
| 122 | return sprintf(buf, "full\n"); |
| 123 | } |
| 124 | |
| 125 | static ssize_t ad7816_store_mode(struct device *dev, |
| 126 | struct device_attribute *attr, |
| 127 | const char *buf, |
| 128 | size_t len) |
| 129 | { |
Lars-Peter Clausen | 62c5183 | 2012-05-12 15:39:42 +0200 | [diff] [blame] | 130 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
Jonathan Cameron | 84f79ec | 2011-10-06 17:14:37 +0100 | [diff] [blame] | 131 | struct ad7816_chip_info *chip = iio_priv(indio_dev); |
Sonic Zhang | 7924425 | 2010-10-27 21:43:59 -0400 | [diff] [blame] | 132 | |
| 133 | if (strcmp(buf, "full")) { |
| 134 | gpio_set_value(chip->rdwr_pin, 1); |
| 135 | chip->mode = AD7816_FULL; |
| 136 | } else { |
| 137 | gpio_set_value(chip->rdwr_pin, 0); |
| 138 | chip->mode = AD7816_PD; |
| 139 | } |
| 140 | |
| 141 | return len; |
| 142 | } |
| 143 | |
| 144 | static IIO_DEVICE_ATTR(mode, S_IRUGO | S_IWUSR, |
| 145 | ad7816_show_mode, |
| 146 | ad7816_store_mode, |
| 147 | 0); |
| 148 | |
| 149 | static ssize_t ad7816_show_available_modes(struct device *dev, |
| 150 | struct device_attribute *attr, |
| 151 | char *buf) |
| 152 | { |
| 153 | return sprintf(buf, "full\npower-save\n"); |
| 154 | } |
| 155 | |
| 156 | static IIO_DEVICE_ATTR(available_modes, S_IRUGO, ad7816_show_available_modes, NULL, 0); |
| 157 | |
| 158 | static ssize_t ad7816_show_channel(struct device *dev, |
| 159 | struct device_attribute *attr, |
| 160 | char *buf) |
| 161 | { |
Lars-Peter Clausen | 62c5183 | 2012-05-12 15:39:42 +0200 | [diff] [blame] | 162 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
Jonathan Cameron | 84f79ec | 2011-10-06 17:14:37 +0100 | [diff] [blame] | 163 | struct ad7816_chip_info *chip = iio_priv(indio_dev); |
Sonic Zhang | 7924425 | 2010-10-27 21:43:59 -0400 | [diff] [blame] | 164 | |
| 165 | return sprintf(buf, "%d\n", chip->channel_id); |
| 166 | } |
| 167 | |
| 168 | static ssize_t ad7816_store_channel(struct device *dev, |
| 169 | struct device_attribute *attr, |
| 170 | const char *buf, |
| 171 | size_t len) |
| 172 | { |
Lars-Peter Clausen | 62c5183 | 2012-05-12 15:39:42 +0200 | [diff] [blame] | 173 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
Jonathan Cameron | 84f79ec | 2011-10-06 17:14:37 +0100 | [diff] [blame] | 174 | struct ad7816_chip_info *chip = iio_priv(indio_dev); |
Sonic Zhang | 7924425 | 2010-10-27 21:43:59 -0400 | [diff] [blame] | 175 | unsigned long data; |
| 176 | int ret; |
| 177 | |
Aida Mynzhasova | f86f836 | 2013-05-07 00:04:41 +0400 | [diff] [blame] | 178 | ret = kstrtoul(buf, 10, &data); |
Sonic Zhang | 7924425 | 2010-10-27 21:43:59 -0400 | [diff] [blame] | 179 | if (ret) |
Aida Mynzhasova | f86f836 | 2013-05-07 00:04:41 +0400 | [diff] [blame] | 180 | return ret; |
Sonic Zhang | 7924425 | 2010-10-27 21:43:59 -0400 | [diff] [blame] | 181 | |
| 182 | if (data > AD7816_CS_MAX && data != AD7816_CS_MASK) { |
| 183 | dev_err(&chip->spi_dev->dev, "Invalid channel id %lu for %s.\n", |
Jonathan Cameron | 84f79ec | 2011-10-06 17:14:37 +0100 | [diff] [blame] | 184 | data, indio_dev->name); |
Sonic Zhang | 7924425 | 2010-10-27 21:43:59 -0400 | [diff] [blame] | 185 | return -EINVAL; |
Jonathan Cameron | 84f79ec | 2011-10-06 17:14:37 +0100 | [diff] [blame] | 186 | } else if (strcmp(indio_dev->name, "ad7818") == 0 && data > 1) { |
Sonic Zhang | 7924425 | 2010-10-27 21:43:59 -0400 | [diff] [blame] | 187 | dev_err(&chip->spi_dev->dev, |
| 188 | "Invalid channel id %lu for ad7818.\n", data); |
| 189 | return -EINVAL; |
Jonathan Cameron | 84f79ec | 2011-10-06 17:14:37 +0100 | [diff] [blame] | 190 | } else if (strcmp(indio_dev->name, "ad7816") == 0 && data > 0) { |
Sonic Zhang | 7924425 | 2010-10-27 21:43:59 -0400 | [diff] [blame] | 191 | dev_err(&chip->spi_dev->dev, |
| 192 | "Invalid channel id %lu for ad7816.\n", data); |
| 193 | return -EINVAL; |
| 194 | } |
| 195 | |
| 196 | chip->channel_id = data; |
| 197 | |
| 198 | return len; |
| 199 | } |
| 200 | |
| 201 | static IIO_DEVICE_ATTR(channel, S_IRUGO | S_IWUSR, |
| 202 | ad7816_show_channel, |
| 203 | ad7816_store_channel, |
| 204 | 0); |
| 205 | |
| 206 | |
| 207 | static ssize_t ad7816_show_value(struct device *dev, |
| 208 | struct device_attribute *attr, |
| 209 | char *buf) |
| 210 | { |
Lars-Peter Clausen | 62c5183 | 2012-05-12 15:39:42 +0200 | [diff] [blame] | 211 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
Jonathan Cameron | 84f79ec | 2011-10-06 17:14:37 +0100 | [diff] [blame] | 212 | struct ad7816_chip_info *chip = iio_priv(indio_dev); |
Sonic Zhang | 7924425 | 2010-10-27 21:43:59 -0400 | [diff] [blame] | 213 | u16 data; |
| 214 | s8 value; |
| 215 | int ret; |
| 216 | |
| 217 | ret = ad7816_spi_read(chip, &data); |
| 218 | if (ret) |
| 219 | return -EIO; |
| 220 | |
| 221 | data >>= AD7816_VALUE_OFFSET; |
| 222 | |
| 223 | if (chip->channel_id == 0) { |
| 224 | value = (s8)((data >> AD7816_TEMP_FLOAT_OFFSET) - 103); |
| 225 | data &= AD7816_TEMP_FLOAT_MASK; |
| 226 | if (value < 0) |
| 227 | data = (1 << AD7816_TEMP_FLOAT_OFFSET) - data; |
| 228 | return sprintf(buf, "%d.%.2d\n", value, data * 25); |
| 229 | } else |
| 230 | return sprintf(buf, "%u\n", data); |
| 231 | } |
| 232 | |
| 233 | static IIO_DEVICE_ATTR(value, S_IRUGO, ad7816_show_value, NULL, 0); |
| 234 | |
Sonic Zhang | 7924425 | 2010-10-27 21:43:59 -0400 | [diff] [blame] | 235 | static struct attribute *ad7816_attributes[] = { |
| 236 | &iio_dev_attr_available_modes.dev_attr.attr, |
| 237 | &iio_dev_attr_mode.dev_attr.attr, |
| 238 | &iio_dev_attr_channel.dev_attr.attr, |
| 239 | &iio_dev_attr_value.dev_attr.attr, |
Sonic Zhang | 7924425 | 2010-10-27 21:43:59 -0400 | [diff] [blame] | 240 | NULL, |
| 241 | }; |
| 242 | |
| 243 | static const struct attribute_group ad7816_attribute_group = { |
| 244 | .attrs = ad7816_attributes, |
| 245 | }; |
| 246 | |
| 247 | /* |
| 248 | * temperature bound events |
| 249 | */ |
| 250 | |
Jonathan Cameron | c4b14d9 | 2011-08-12 17:56:04 +0100 | [diff] [blame] | 251 | #define IIO_EVENT_CODE_AD7816_OTI IIO_UNMOD_EVENT_CODE(IIO_TEMP, \ |
Jonathan Cameron | 0bb8be6 | 2011-05-18 14:42:14 +0100 | [diff] [blame] | 252 | 0, \ |
| 253 | IIO_EV_TYPE_THRESH, \ |
| 254 | IIO_EV_DIR_FALLING) |
Sonic Zhang | 7924425 | 2010-10-27 21:43:59 -0400 | [diff] [blame] | 255 | |
Jonathan Cameron | db9afe2 | 2011-05-18 14:41:07 +0100 | [diff] [blame] | 256 | static irqreturn_t ad7816_event_handler(int irq, void *private) |
Sonic Zhang | 7924425 | 2010-10-27 21:43:59 -0400 | [diff] [blame] | 257 | { |
Jonathan Cameron | 5aa9618 | 2011-08-30 12:41:06 +0100 | [diff] [blame] | 258 | iio_push_event(private, IIO_EVENT_CODE_AD7816_OTI, iio_get_time_ns()); |
Jonathan Cameron | db9afe2 | 2011-05-18 14:41:07 +0100 | [diff] [blame] | 259 | return IRQ_HANDLED; |
Sonic Zhang | 7924425 | 2010-10-27 21:43:59 -0400 | [diff] [blame] | 260 | } |
| 261 | |
Sonic Zhang | 7924425 | 2010-10-27 21:43:59 -0400 | [diff] [blame] | 262 | static ssize_t ad7816_show_oti(struct device *dev, |
| 263 | struct device_attribute *attr, |
| 264 | char *buf) |
| 265 | { |
Lars-Peter Clausen | 62c5183 | 2012-05-12 15:39:42 +0200 | [diff] [blame] | 266 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
Jonathan Cameron | 84f79ec | 2011-10-06 17:14:37 +0100 | [diff] [blame] | 267 | struct ad7816_chip_info *chip = iio_priv(indio_dev); |
Sonic Zhang | 7924425 | 2010-10-27 21:43:59 -0400 | [diff] [blame] | 268 | int value; |
| 269 | |
| 270 | if (chip->channel_id > AD7816_CS_MAX) { |
| 271 | dev_err(dev, "Invalid oti channel id %d.\n", chip->channel_id); |
| 272 | return -EINVAL; |
| 273 | } else if (chip->channel_id == 0) { |
| 274 | value = AD7816_BOUND_VALUE_MIN + |
| 275 | (chip->oti_data[chip->channel_id] - |
| 276 | AD7816_BOUND_VALUE_BASE); |
| 277 | return sprintf(buf, "%d\n", value); |
| 278 | } else |
| 279 | return sprintf(buf, "%u\n", chip->oti_data[chip->channel_id]); |
| 280 | } |
| 281 | |
| 282 | static inline ssize_t ad7816_set_oti(struct device *dev, |
| 283 | struct device_attribute *attr, |
| 284 | const char *buf, |
| 285 | size_t len) |
| 286 | { |
Lars-Peter Clausen | 62c5183 | 2012-05-12 15:39:42 +0200 | [diff] [blame] | 287 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
Jonathan Cameron | 84f79ec | 2011-10-06 17:14:37 +0100 | [diff] [blame] | 288 | struct ad7816_chip_info *chip = iio_priv(indio_dev); |
Sonic Zhang | 7924425 | 2010-10-27 21:43:59 -0400 | [diff] [blame] | 289 | long value; |
| 290 | u8 data; |
| 291 | int ret; |
| 292 | |
Aida Mynzhasova | f86f836 | 2013-05-07 00:04:41 +0400 | [diff] [blame] | 293 | ret = kstrtol(buf, 10, &value); |
| 294 | if (ret) |
| 295 | return ret; |
Sonic Zhang | 7924425 | 2010-10-27 21:43:59 -0400 | [diff] [blame] | 296 | |
| 297 | if (chip->channel_id > AD7816_CS_MAX) { |
| 298 | dev_err(dev, "Invalid oti channel id %d.\n", chip->channel_id); |
| 299 | return -EINVAL; |
| 300 | } else if (chip->channel_id == 0) { |
| 301 | if (ret || value < AD7816_BOUND_VALUE_MIN || |
| 302 | value > AD7816_BOUND_VALUE_MAX) |
| 303 | return -EINVAL; |
| 304 | |
| 305 | data = (u8)(value - AD7816_BOUND_VALUE_MIN + |
| 306 | AD7816_BOUND_VALUE_BASE); |
| 307 | } else { |
| 308 | if (ret || value < AD7816_BOUND_VALUE_BASE || value > 255) |
| 309 | return -EINVAL; |
| 310 | |
| 311 | data = (u8)value; |
| 312 | } |
| 313 | |
| 314 | ret = ad7816_spi_write(chip, data); |
| 315 | if (ret) |
| 316 | return -EIO; |
| 317 | |
| 318 | chip->oti_data[chip->channel_id] = data; |
| 319 | |
| 320 | return len; |
| 321 | } |
| 322 | |
Jonathan Cameron | db9afe2 | 2011-05-18 14:41:07 +0100 | [diff] [blame] | 323 | static IIO_DEVICE_ATTR(oti, S_IRUGO | S_IWUSR, |
| 324 | ad7816_show_oti, ad7816_set_oti, 0); |
Sonic Zhang | 7924425 | 2010-10-27 21:43:59 -0400 | [diff] [blame] | 325 | |
| 326 | static struct attribute *ad7816_event_attributes[] = { |
Jonathan Cameron | db9afe2 | 2011-05-18 14:41:07 +0100 | [diff] [blame] | 327 | &iio_dev_attr_oti.dev_attr.attr, |
Sonic Zhang | 7924425 | 2010-10-27 21:43:59 -0400 | [diff] [blame] | 328 | NULL, |
| 329 | }; |
| 330 | |
| 331 | static struct attribute_group ad7816_event_attribute_group = { |
| 332 | .attrs = ad7816_event_attributes, |
Jonathan Cameron | 8e7d967 | 2011-08-30 12:32:45 +0100 | [diff] [blame] | 333 | .name = "events", |
Sonic Zhang | 7924425 | 2010-10-27 21:43:59 -0400 | [diff] [blame] | 334 | }; |
| 335 | |
Jonathan Cameron | 6fe8135 | 2011-05-18 14:42:37 +0100 | [diff] [blame] | 336 | static const struct iio_info ad7816_info = { |
| 337 | .attrs = &ad7816_attribute_group, |
Jonathan Cameron | 6fe8135 | 2011-05-18 14:42:37 +0100 | [diff] [blame] | 338 | .event_attrs = &ad7816_event_attribute_group, |
| 339 | .driver_module = THIS_MODULE, |
| 340 | }; |
| 341 | |
Sonic Zhang | 7924425 | 2010-10-27 21:43:59 -0400 | [diff] [blame] | 342 | /* |
| 343 | * device probe and remove |
| 344 | */ |
| 345 | |
Bill Pemberton | 4ae1c61 | 2012-11-19 13:21:57 -0500 | [diff] [blame] | 346 | static int ad7816_probe(struct spi_device *spi_dev) |
Sonic Zhang | 7924425 | 2010-10-27 21:43:59 -0400 | [diff] [blame] | 347 | { |
| 348 | struct ad7816_chip_info *chip; |
Jonathan Cameron | b0011d6 | 2011-06-27 13:07:26 +0100 | [diff] [blame] | 349 | struct iio_dev *indio_dev; |
Sonic Zhang | 7924425 | 2010-10-27 21:43:59 -0400 | [diff] [blame] | 350 | unsigned short *pins = spi_dev->dev.platform_data; |
| 351 | int ret = 0; |
| 352 | int i; |
| 353 | |
| 354 | if (!pins) { |
| 355 | dev_err(&spi_dev->dev, "No necessary GPIO platform data.\n"); |
| 356 | return -EINVAL; |
| 357 | } |
| 358 | |
Lars-Peter Clausen | 7cbb753 | 2012-04-26 13:35:01 +0200 | [diff] [blame] | 359 | indio_dev = iio_device_alloc(sizeof(*chip)); |
Jonathan Cameron | b0011d6 | 2011-06-27 13:07:26 +0100 | [diff] [blame] | 360 | if (indio_dev == NULL) { |
| 361 | ret = -ENOMEM; |
| 362 | goto error_ret; |
| 363 | } |
| 364 | chip = iio_priv(indio_dev); |
Sonic Zhang | 7924425 | 2010-10-27 21:43:59 -0400 | [diff] [blame] | 365 | /* this is only used for device removal purposes */ |
Jonathan Cameron | b0011d6 | 2011-06-27 13:07:26 +0100 | [diff] [blame] | 366 | dev_set_drvdata(&spi_dev->dev, indio_dev); |
Sonic Zhang | 7924425 | 2010-10-27 21:43:59 -0400 | [diff] [blame] | 367 | |
| 368 | chip->spi_dev = spi_dev; |
Sonic Zhang | 7924425 | 2010-10-27 21:43:59 -0400 | [diff] [blame] | 369 | for (i = 0; i <= AD7816_CS_MAX; i++) |
| 370 | chip->oti_data[i] = 203; |
| 371 | chip->rdwr_pin = pins[0]; |
| 372 | chip->convert_pin = pins[1]; |
| 373 | chip->busy_pin = pins[2]; |
| 374 | |
Jonathan Cameron | 845bd12 | 2011-05-18 14:41:44 +0100 | [diff] [blame] | 375 | ret = gpio_request(chip->rdwr_pin, spi_get_device_id(spi_dev)->name); |
Sonic Zhang | 7924425 | 2010-10-27 21:43:59 -0400 | [diff] [blame] | 376 | if (ret) { |
| 377 | dev_err(&spi_dev->dev, "Fail to request rdwr gpio PIN %d.\n", |
| 378 | chip->rdwr_pin); |
Jonathan Cameron | b0011d6 | 2011-06-27 13:07:26 +0100 | [diff] [blame] | 379 | goto error_free_device; |
Sonic Zhang | 7924425 | 2010-10-27 21:43:59 -0400 | [diff] [blame] | 380 | } |
| 381 | gpio_direction_input(chip->rdwr_pin); |
Jonathan Cameron | 845bd12 | 2011-05-18 14:41:44 +0100 | [diff] [blame] | 382 | ret = gpio_request(chip->convert_pin, spi_get_device_id(spi_dev)->name); |
Sonic Zhang | 7924425 | 2010-10-27 21:43:59 -0400 | [diff] [blame] | 383 | if (ret) { |
| 384 | dev_err(&spi_dev->dev, "Fail to request convert gpio PIN %d.\n", |
| 385 | chip->convert_pin); |
| 386 | goto error_free_gpio_rdwr; |
| 387 | } |
| 388 | gpio_direction_input(chip->convert_pin); |
Jonathan Cameron | 845bd12 | 2011-05-18 14:41:44 +0100 | [diff] [blame] | 389 | ret = gpio_request(chip->busy_pin, spi_get_device_id(spi_dev)->name); |
Sonic Zhang | 7924425 | 2010-10-27 21:43:59 -0400 | [diff] [blame] | 390 | if (ret) { |
| 391 | dev_err(&spi_dev->dev, "Fail to request busy gpio PIN %d.\n", |
| 392 | chip->busy_pin); |
| 393 | goto error_free_gpio_convert; |
| 394 | } |
| 395 | gpio_direction_input(chip->busy_pin); |
| 396 | |
Jonathan Cameron | b0011d6 | 2011-06-27 13:07:26 +0100 | [diff] [blame] | 397 | indio_dev->name = spi_get_device_id(spi_dev)->name; |
| 398 | indio_dev->dev.parent = &spi_dev->dev; |
| 399 | indio_dev->info = &ad7816_info; |
| 400 | indio_dev->modes = INDIO_DIRECT_MODE; |
Sonic Zhang | 7924425 | 2010-10-27 21:43:59 -0400 | [diff] [blame] | 401 | |
Sonic Zhang | 7924425 | 2010-10-27 21:43:59 -0400 | [diff] [blame] | 402 | if (spi_dev->irq) { |
| 403 | /* Only low trigger is supported in ad7816/7/8 */ |
Jonathan Cameron | db9afe2 | 2011-05-18 14:41:07 +0100 | [diff] [blame] | 404 | ret = request_threaded_irq(spi_dev->irq, |
| 405 | NULL, |
| 406 | &ad7816_event_handler, |
Lars-Peter Clausen | a91aff1 | 2012-07-02 10:54:45 +0200 | [diff] [blame] | 407 | IRQF_TRIGGER_LOW | IRQF_ONESHOT, |
Jonathan Cameron | b0011d6 | 2011-06-27 13:07:26 +0100 | [diff] [blame] | 408 | indio_dev->name, |
| 409 | indio_dev); |
Sonic Zhang | 7924425 | 2010-10-27 21:43:59 -0400 | [diff] [blame] | 410 | if (ret) |
Jonathan Cameron | 26d25ae | 2011-09-02 17:14:40 +0100 | [diff] [blame] | 411 | goto error_free_gpio; |
Sonic Zhang | 7924425 | 2010-10-27 21:43:59 -0400 | [diff] [blame] | 412 | } |
| 413 | |
Jonathan Cameron | 26d25ae | 2011-09-02 17:14:40 +0100 | [diff] [blame] | 414 | ret = iio_device_register(indio_dev); |
| 415 | if (ret) |
| 416 | goto error_free_irq; |
| 417 | |
Sonic Zhang | 7924425 | 2010-10-27 21:43:59 -0400 | [diff] [blame] | 418 | dev_info(&spi_dev->dev, "%s temperature sensor and ADC registered.\n", |
Jonathan Cameron | b0011d6 | 2011-06-27 13:07:26 +0100 | [diff] [blame] | 419 | indio_dev->name); |
Sonic Zhang | 7924425 | 2010-10-27 21:43:59 -0400 | [diff] [blame] | 420 | |
| 421 | return 0; |
Jonathan Cameron | 26d25ae | 2011-09-02 17:14:40 +0100 | [diff] [blame] | 422 | error_free_irq: |
| 423 | free_irq(spi_dev->irq, indio_dev); |
Sonic Zhang | 7924425 | 2010-10-27 21:43:59 -0400 | [diff] [blame] | 424 | error_free_gpio: |
| 425 | gpio_free(chip->busy_pin); |
| 426 | error_free_gpio_convert: |
| 427 | gpio_free(chip->convert_pin); |
| 428 | error_free_gpio_rdwr: |
| 429 | gpio_free(chip->rdwr_pin); |
Jonathan Cameron | b0011d6 | 2011-06-27 13:07:26 +0100 | [diff] [blame] | 430 | error_free_device: |
Lars-Peter Clausen | 7cbb753 | 2012-04-26 13:35:01 +0200 | [diff] [blame] | 431 | iio_device_free(indio_dev); |
Jonathan Cameron | b0011d6 | 2011-06-27 13:07:26 +0100 | [diff] [blame] | 432 | error_ret: |
Sonic Zhang | 7924425 | 2010-10-27 21:43:59 -0400 | [diff] [blame] | 433 | return ret; |
| 434 | } |
| 435 | |
Bill Pemberton | 447d4f2 | 2012-11-19 13:26:37 -0500 | [diff] [blame] | 436 | static int ad7816_remove(struct spi_device *spi_dev) |
Sonic Zhang | 7924425 | 2010-10-27 21:43:59 -0400 | [diff] [blame] | 437 | { |
Jonathan Cameron | b0011d6 | 2011-06-27 13:07:26 +0100 | [diff] [blame] | 438 | struct iio_dev *indio_dev = dev_get_drvdata(&spi_dev->dev); |
| 439 | struct ad7816_chip_info *chip = iio_priv(indio_dev); |
Sonic Zhang | 7924425 | 2010-10-27 21:43:59 -0400 | [diff] [blame] | 440 | |
Jonathan Cameron | d2fffd6 | 2011-10-14 14:46:58 +0100 | [diff] [blame] | 441 | iio_device_unregister(indio_dev); |
Sonic Zhang | 7924425 | 2010-10-27 21:43:59 -0400 | [diff] [blame] | 442 | dev_set_drvdata(&spi_dev->dev, NULL); |
| 443 | if (spi_dev->irq) |
Jonathan Cameron | db9afe2 | 2011-05-18 14:41:07 +0100 | [diff] [blame] | 444 | free_irq(spi_dev->irq, indio_dev); |
Sonic Zhang | 7924425 | 2010-10-27 21:43:59 -0400 | [diff] [blame] | 445 | gpio_free(chip->busy_pin); |
| 446 | gpio_free(chip->convert_pin); |
| 447 | gpio_free(chip->rdwr_pin); |
Lars-Peter Clausen | 7cbb753 | 2012-04-26 13:35:01 +0200 | [diff] [blame] | 448 | iio_device_free(indio_dev); |
Sonic Zhang | 7924425 | 2010-10-27 21:43:59 -0400 | [diff] [blame] | 449 | |
| 450 | return 0; |
| 451 | } |
| 452 | |
| 453 | static const struct spi_device_id ad7816_id[] = { |
| 454 | { "ad7816", 0 }, |
| 455 | { "ad7817", 0 }, |
| 456 | { "ad7818", 0 }, |
| 457 | {} |
| 458 | }; |
| 459 | |
| 460 | MODULE_DEVICE_TABLE(spi, ad7816_id); |
| 461 | |
| 462 | static struct spi_driver ad7816_driver = { |
| 463 | .driver = { |
| 464 | .name = "ad7816", |
Sonic Zhang | 7924425 | 2010-10-27 21:43:59 -0400 | [diff] [blame] | 465 | .owner = THIS_MODULE, |
| 466 | }, |
| 467 | .probe = ad7816_probe, |
Bill Pemberton | e543acf | 2012-11-19 13:21:38 -0500 | [diff] [blame] | 468 | .remove = ad7816_remove, |
Sonic Zhang | 7924425 | 2010-10-27 21:43:59 -0400 | [diff] [blame] | 469 | .id_table = ad7816_id, |
| 470 | }; |
Lars-Peter Clausen | ae6ae6f | 2011-11-16 10:13:39 +0100 | [diff] [blame] | 471 | module_spi_driver(ad7816_driver); |
Sonic Zhang | 7924425 | 2010-10-27 21:43:59 -0400 | [diff] [blame] | 472 | |
| 473 | MODULE_AUTHOR("Sonic Zhang <sonic.zhang@analog.com>"); |
| 474 | MODULE_DESCRIPTION("Analog Devices AD7816/7/8 digital" |
| 475 | " temperature sensor driver"); |
| 476 | MODULE_LICENSE("GPL v2"); |