Jonathan Cameron | d1325cf | 2009-08-18 18:06:20 +0100 | [diff] [blame] | 1 | /* |
| 2 | * linux/drivers/industrialio/adc/max1363.c |
| 3 | * Copyright (C) 2008 Jonathan Cameron |
| 4 | * |
| 5 | * based on linux/drivers/i2c/chips/max123x |
| 6 | * Copyright (C) 2002-2004 Stefan Eletzhofer |
| 7 | * |
| 8 | * based on linux/drivers/acron/char/pcf8583.c |
| 9 | * Copyright (C) 2000 Russell King |
| 10 | * |
| 11 | * This program is free software; you can redistribute it and/or modify |
| 12 | * it under the terms of the GNU General Public License version 2 as |
| 13 | * published by the Free Software Foundation. |
| 14 | * |
| 15 | * max1363.c |
| 16 | * |
| 17 | * Partial support for max1363 and similar chips. |
| 18 | * |
| 19 | * Not currently implemented. |
| 20 | * |
| 21 | * - Monitor interrrupt generation. |
| 22 | * - Control of internal reference. |
| 23 | * - Sysfs scan interface currently assumes unipolar mode. |
| 24 | */ |
| 25 | |
| 26 | #include <linux/interrupt.h> |
| 27 | #include <linux/gpio.h> |
| 28 | #include <linux/workqueue.h> |
| 29 | #include <linux/device.h> |
| 30 | #include <linux/kernel.h> |
| 31 | #include <linux/sysfs.h> |
| 32 | #include <linux/list.h> |
| 33 | #include <linux/i2c.h> |
| 34 | #include <linux/rtc.h> |
| 35 | #include <linux/regulator/consumer.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame^] | 36 | #include <linux/slab.h> |
Jonathan Cameron | d1325cf | 2009-08-18 18:06:20 +0100 | [diff] [blame] | 37 | |
| 38 | #include "../iio.h" |
| 39 | #include "../sysfs.h" |
| 40 | |
| 41 | #include "max1363.h" |
| 42 | |
| 43 | /* Available scan modes. |
| 44 | * Awkwardly the associated enum is in the header so it is available to |
| 45 | * the ring buffer code. |
| 46 | */ |
| 47 | static const struct max1363_mode max1363_mode_table[] = { |
| 48 | MAX1363_MODE_SINGLE(0), |
| 49 | MAX1363_MODE_SINGLE(1), |
| 50 | MAX1363_MODE_SINGLE(2), |
| 51 | MAX1363_MODE_SINGLE(3), |
| 52 | MAX1363_MODE_SINGLE(4), |
| 53 | MAX1363_MODE_SINGLE(5), |
| 54 | MAX1363_MODE_SINGLE(6), |
| 55 | MAX1363_MODE_SINGLE(7), |
| 56 | MAX1363_MODE_SINGLE(8), |
| 57 | MAX1363_MODE_SINGLE(9), |
| 58 | MAX1363_MODE_SINGLE(10), |
| 59 | MAX1363_MODE_SINGLE(11), |
| 60 | |
| 61 | MAX1363_MODE_SINGLE_TIMES_8(0), |
| 62 | MAX1363_MODE_SINGLE_TIMES_8(1), |
| 63 | MAX1363_MODE_SINGLE_TIMES_8(2), |
| 64 | MAX1363_MODE_SINGLE_TIMES_8(3), |
| 65 | MAX1363_MODE_SINGLE_TIMES_8(4), |
| 66 | MAX1363_MODE_SINGLE_TIMES_8(5), |
| 67 | MAX1363_MODE_SINGLE_TIMES_8(6), |
| 68 | MAX1363_MODE_SINGLE_TIMES_8(7), |
| 69 | MAX1363_MODE_SINGLE_TIMES_8(8), |
| 70 | MAX1363_MODE_SINGLE_TIMES_8(9), |
| 71 | MAX1363_MODE_SINGLE_TIMES_8(10), |
| 72 | MAX1363_MODE_SINGLE_TIMES_8(11), |
| 73 | |
| 74 | MAX1363_MODE_SCAN_TO_CHANNEL(1), |
| 75 | MAX1363_MODE_SCAN_TO_CHANNEL(2), |
| 76 | MAX1363_MODE_SCAN_TO_CHANNEL(3), |
| 77 | MAX1363_MODE_SCAN_TO_CHANNEL(4), |
| 78 | MAX1363_MODE_SCAN_TO_CHANNEL(5), |
| 79 | MAX1363_MODE_SCAN_TO_CHANNEL(6), |
| 80 | MAX1363_MODE_SCAN_TO_CHANNEL(7), |
| 81 | MAX1363_MODE_SCAN_TO_CHANNEL(8), |
| 82 | MAX1363_MODE_SCAN_TO_CHANNEL(9), |
| 83 | MAX1363_MODE_SCAN_TO_CHANNEL(10), |
| 84 | MAX1363_MODE_SCAN_TO_CHANNEL(11), |
| 85 | |
| 86 | MAX1363_MODE_DIFF_SINGLE(0, 1), |
| 87 | MAX1363_MODE_DIFF_SINGLE(2, 3), |
| 88 | MAX1363_MODE_DIFF_SINGLE(4, 5), |
| 89 | MAX1363_MODE_DIFF_SINGLE(6, 7), |
| 90 | MAX1363_MODE_DIFF_SINGLE(8, 9), |
| 91 | MAX1363_MODE_DIFF_SINGLE(10, 11), |
| 92 | MAX1363_MODE_DIFF_SINGLE(1, 0), |
| 93 | MAX1363_MODE_DIFF_SINGLE(3, 2), |
| 94 | MAX1363_MODE_DIFF_SINGLE(5, 4), |
| 95 | MAX1363_MODE_DIFF_SINGLE(7, 6), |
| 96 | MAX1363_MODE_DIFF_SINGLE(9, 8), |
| 97 | MAX1363_MODE_DIFF_SINGLE(11, 10), |
| 98 | |
| 99 | MAX1363_MODE_DIFF_SINGLE_TIMES_8(0, 1), |
| 100 | MAX1363_MODE_DIFF_SINGLE_TIMES_8(2, 3), |
| 101 | MAX1363_MODE_DIFF_SINGLE_TIMES_8(4, 5), |
| 102 | MAX1363_MODE_DIFF_SINGLE_TIMES_8(6, 7), |
| 103 | MAX1363_MODE_DIFF_SINGLE_TIMES_8(8, 9), |
| 104 | MAX1363_MODE_DIFF_SINGLE_TIMES_8(10, 11), |
| 105 | MAX1363_MODE_DIFF_SINGLE_TIMES_8(1, 0), |
| 106 | MAX1363_MODE_DIFF_SINGLE_TIMES_8(3, 2), |
| 107 | MAX1363_MODE_DIFF_SINGLE_TIMES_8(5, 4), |
| 108 | MAX1363_MODE_DIFF_SINGLE_TIMES_8(7, 6), |
| 109 | MAX1363_MODE_DIFF_SINGLE_TIMES_8(9, 8), |
| 110 | MAX1363_MODE_DIFF_SINGLE_TIMES_8(11, 10), |
| 111 | |
| 112 | MAX1363_MODE_DIFF_SCAN_TO_CHANNEL_NAMED(0-1...2-3, 2, 2), |
| 113 | MAX1363_MODE_DIFF_SCAN_TO_CHANNEL_NAMED(0-1...4-5, 4, 3), |
| 114 | MAX1363_MODE_DIFF_SCAN_TO_CHANNEL_NAMED(0-1...6-7, 6, 4), |
| 115 | MAX1363_MODE_DIFF_SCAN_TO_CHANNEL_NAMED(0-1...8-9, 8, 5), |
| 116 | MAX1363_MODE_DIFF_SCAN_TO_CHANNEL_NAMED(0-1...10-11, 10, 6), |
| 117 | MAX1363_MODE_DIFF_SCAN_TO_CHANNEL_NAMED(1-0...3-2, 3, 2), |
| 118 | MAX1363_MODE_DIFF_SCAN_TO_CHANNEL_NAMED(1-0...5-4, 5, 3), |
| 119 | MAX1363_MODE_DIFF_SCAN_TO_CHANNEL_NAMED(1-0...7-6, 7, 4), |
| 120 | MAX1363_MODE_DIFF_SCAN_TO_CHANNEL_NAMED(1-0...9-8, 9, 5), |
| 121 | MAX1363_MODE_DIFF_SCAN_TO_CHANNEL_NAMED(1-0...11-10, 11, 6), |
| 122 | |
| 123 | MAX1236_MODE_SCAN_MID_TO_CHANNEL(2, 3), |
| 124 | MAX1236_MODE_SCAN_MID_TO_CHANNEL(6, 7), |
| 125 | MAX1236_MODE_SCAN_MID_TO_CHANNEL(6, 8), |
| 126 | MAX1236_MODE_SCAN_MID_TO_CHANNEL(6, 9), |
| 127 | MAX1236_MODE_SCAN_MID_TO_CHANNEL(6, 10), |
| 128 | MAX1236_MODE_SCAN_MID_TO_CHANNEL(6, 11), |
| 129 | |
| 130 | MAX1236_MODE_DIFF_SCAN_MID_TO_CHANNEL_NAMED(6-7...8-9, 8, 2), |
| 131 | MAX1236_MODE_DIFF_SCAN_MID_TO_CHANNEL_NAMED(6-7...10-11, 10, 3), |
| 132 | MAX1236_MODE_DIFF_SCAN_MID_TO_CHANNEL_NAMED(7-6...9-8, 9, 2), |
| 133 | MAX1236_MODE_DIFF_SCAN_MID_TO_CHANNEL_NAMED(7-6...11-10, 11, 3), |
| 134 | }; |
| 135 | |
| 136 | /* Applies to max1363 */ |
| 137 | static const enum max1363_modes max1363_mode_list[] = { |
| 138 | _s0, _s1, _s2, _s3, |
| 139 | se0, se1, se2, se3, |
| 140 | s0to1, s0to2, s0to3, |
| 141 | d0m1, d2m3, d1m0, d3m2, |
| 142 | de0m1, de2m3, de1m0, de3m2, |
| 143 | d0m1to2m3, d1m0to3m2, |
| 144 | }; |
| 145 | |
| 146 | /* Appies to max1236, max1237 */ |
| 147 | static const enum max1363_modes max1236_mode_list[] = { |
| 148 | _s0, _s1, _s2, _s3, |
| 149 | se0, se1, se2, se3, |
| 150 | s0to1, s0to2, s0to3, |
| 151 | d0m1, d2m3, d1m0, d3m2, |
| 152 | de0m1, de2m3, de1m0, de3m2, |
| 153 | d0m1to2m3, d1m0to3m2, |
| 154 | s2to3, |
| 155 | }; |
| 156 | |
| 157 | /* Applies to max1238, max1239 */ |
| 158 | static const enum max1363_modes max1238_mode_list[] = { |
| 159 | _s0, _s1, _s2, _s3, _s4, _s5, _s6, _s7, _s8, _s9, _s10, _s11, |
| 160 | se0, se1, se2, se3, se4, se5, se6, se7, se8, se9, se10, se11, |
| 161 | s0to1, s0to2, s0to3, s0to4, s0to5, s0to6, |
| 162 | s0to7, s0to8, s0to9, s0to10, s0to11, |
| 163 | d0m1, d2m3, d4m5, d6m7, d8m9, d10m11, |
| 164 | d1m0, d3m2, d5m4, d7m6, d9m8, d11m10, |
| 165 | de0m1, de2m3, de4m5, de6m7, de8m9, de10m11, |
| 166 | de1m0, de3m2, de5m4, de7m6, de9m8, de11m10, |
| 167 | d0m1to2m3, d0m1to4m5, d0m1to6m7, d0m1to8m9, d0m1to10m11, |
| 168 | d1m0to3m2, d1m0to5m4, d1m0to7m6, d1m0to9m8, d1m0to11m10, |
| 169 | s6to7, s6to8, s6to9, s6to10, s6to11, |
| 170 | s6m7to8m9, s6m7to10m11, s7m6to9m8, s7m6to11m10, |
| 171 | }; |
| 172 | |
| 173 | |
| 174 | enum { max1361, |
| 175 | max1362, |
| 176 | max1363, |
| 177 | max1364, |
| 178 | max1136, |
| 179 | max1137, |
| 180 | max1138, |
| 181 | max1139, |
| 182 | max1236, |
| 183 | max1237, |
| 184 | max1238, |
| 185 | max1239, |
| 186 | }; |
| 187 | |
| 188 | /* max1363 and max1368 tested - rest from data sheet */ |
| 189 | static const struct max1363_chip_info max1363_chip_info_tbl[] = { |
| 190 | { |
| 191 | .name = "max1361", |
| 192 | .num_inputs = 4, |
| 193 | .monitor_mode = 1, |
| 194 | .mode_list = max1363_mode_list, |
| 195 | .num_modes = ARRAY_SIZE(max1363_mode_list), |
| 196 | .default_mode = s0to3, |
| 197 | }, { |
| 198 | .name = "max1362", |
| 199 | .num_inputs = 4, |
| 200 | .monitor_mode = 1, |
| 201 | .mode_list = max1363_mode_list, |
| 202 | .num_modes = ARRAY_SIZE(max1363_mode_list), |
| 203 | .default_mode = s0to3, |
| 204 | }, { |
| 205 | .name = "max1363", |
| 206 | .num_inputs = 4, |
| 207 | .monitor_mode = 1, |
| 208 | .mode_list = max1363_mode_list, |
| 209 | .num_modes = ARRAY_SIZE(max1363_mode_list), |
| 210 | .default_mode = s0to3, |
| 211 | }, { |
| 212 | .name = "max1364", |
| 213 | .num_inputs = 4, |
| 214 | .monitor_mode = 1, |
| 215 | .mode_list = max1363_mode_list, |
| 216 | .num_modes = ARRAY_SIZE(max1363_mode_list), |
| 217 | .default_mode = s0to3, |
| 218 | }, { |
| 219 | .name = "max1136", |
| 220 | .num_inputs = 4, |
| 221 | .int_vref_mv = 4096, |
| 222 | .mode_list = max1236_mode_list, |
| 223 | .num_modes = ARRAY_SIZE(max1236_mode_list), |
| 224 | .default_mode = s0to3, |
| 225 | }, { |
| 226 | .name = "max1137", |
| 227 | .num_inputs = 4, |
| 228 | .int_vref_mv = 2048, |
| 229 | .mode_list = max1236_mode_list, |
| 230 | .num_modes = ARRAY_SIZE(max1236_mode_list), |
| 231 | .default_mode = s0to3, |
| 232 | }, { |
| 233 | .name = "max1138", |
| 234 | .num_inputs = 12, |
| 235 | .int_vref_mv = 4096, |
| 236 | .mode_list = max1238_mode_list, |
| 237 | .num_modes = ARRAY_SIZE(max1238_mode_list), |
| 238 | .default_mode = s0to11, |
| 239 | }, { |
| 240 | .name = "max1139", |
| 241 | .num_inputs = 12, |
| 242 | .int_vref_mv = 2048, |
| 243 | .mode_list = max1238_mode_list, |
| 244 | .num_modes = ARRAY_SIZE(max1238_mode_list), |
| 245 | .default_mode = s0to11, |
| 246 | }, { |
| 247 | .name = "max1236", |
| 248 | .num_inputs = 4, |
| 249 | .int_vref_mv = 4096, |
| 250 | .mode_list = max1236_mode_list, |
| 251 | .num_modes = ARRAY_SIZE(max1236_mode_list), |
| 252 | .default_mode = s0to3, |
| 253 | }, { |
| 254 | .name = "max1237", |
| 255 | .num_inputs = 4, |
| 256 | .int_vref_mv = 2048, |
| 257 | .mode_list = max1236_mode_list, |
| 258 | .num_modes = ARRAY_SIZE(max1236_mode_list), |
| 259 | .default_mode = s0to3, |
| 260 | }, { |
| 261 | .name = "max1238", |
| 262 | .num_inputs = 12, |
| 263 | .int_vref_mv = 4096, |
| 264 | .mode_list = max1238_mode_list, |
| 265 | .num_modes = ARRAY_SIZE(max1238_mode_list), |
| 266 | .default_mode = s0to11, |
| 267 | }, { |
| 268 | .name = "max1239", |
| 269 | .num_inputs = 12, |
| 270 | .int_vref_mv = 2048, |
| 271 | .mode_list = max1238_mode_list, |
| 272 | .num_modes = ARRAY_SIZE(max1238_mode_list), |
| 273 | .default_mode = s0to11, |
| 274 | }, |
| 275 | }; |
| 276 | |
| 277 | static int max1363_write_basic_config(struct i2c_client *client, |
| 278 | unsigned char d1, |
| 279 | unsigned char d2) |
| 280 | { |
| 281 | int ret; |
| 282 | u8 *tx_buf = kmalloc(2 , GFP_KERNEL); |
| 283 | if (!tx_buf) |
| 284 | return -ENOMEM; |
| 285 | tx_buf[0] = d1; |
| 286 | tx_buf[1] = d2; |
| 287 | |
| 288 | ret = i2c_master_send(client, tx_buf, 2); |
| 289 | kfree(tx_buf); |
| 290 | return (ret > 0) ? 0 : ret; |
| 291 | } |
| 292 | |
| 293 | static int max1363_set_scan_mode(struct max1363_state *st) |
| 294 | { |
| 295 | st->configbyte &= ~(MAX1363_CHANNEL_SEL_MASK |
| 296 | | MAX1363_SCAN_MASK |
| 297 | | MAX1363_SE_DE_MASK); |
| 298 | st->configbyte |= st->current_mode->conf; |
| 299 | |
| 300 | return max1363_write_basic_config(st->client, |
| 301 | st->setupbyte, |
| 302 | st->configbyte); |
| 303 | } |
| 304 | |
| 305 | static int max1363_initial_setup(struct max1363_state *st) |
| 306 | { |
| 307 | st->setupbyte = MAX1363_SETUP_AIN3_IS_AIN3_REF_IS_VDD |
| 308 | | MAX1363_SETUP_POWER_UP_INT_REF |
| 309 | | MAX1363_SETUP_INT_CLOCK |
| 310 | | MAX1363_SETUP_UNIPOLAR |
| 311 | | MAX1363_SETUP_NORESET; |
| 312 | |
| 313 | /* Set scan mode writes the config anyway so wait until then*/ |
| 314 | st->setupbyte = MAX1363_SETUP_BYTE(st->setupbyte); |
| 315 | st->current_mode = &max1363_mode_table[st->chip_info->default_mode]; |
| 316 | st->configbyte = MAX1363_CONFIG_BYTE(st->configbyte); |
| 317 | |
| 318 | return max1363_set_scan_mode(st); |
| 319 | } |
| 320 | |
| 321 | static ssize_t max1363_show_av_scan_modes(struct device *dev, |
| 322 | struct device_attribute *attr, |
| 323 | char *buf) |
| 324 | { |
| 325 | struct iio_dev *dev_info = dev_get_drvdata(dev); |
| 326 | struct max1363_state *st = dev_info->dev_data; |
| 327 | int i, len = 0; |
| 328 | |
| 329 | for (i = 0; i < st->chip_info->num_modes; i++) |
| 330 | len += sprintf(buf + len, "%s ", |
| 331 | max1363_mode_table[st->chip_info |
| 332 | ->mode_list[i]].name); |
| 333 | len += sprintf(buf + len, "\n"); |
| 334 | |
| 335 | return len; |
| 336 | } |
| 337 | |
| 338 | |
| 339 | /* The dev here is the sysfs related one, not the underlying i2c one */ |
| 340 | static ssize_t max1363_scan_direct(struct device *dev, |
| 341 | struct device_attribute *attr, |
| 342 | char *buf) |
| 343 | { |
| 344 | struct iio_dev *dev_info = dev_get_drvdata(dev); |
| 345 | struct max1363_state *st = dev_info->dev_data; |
| 346 | int len = 0, ret, i; |
| 347 | struct i2c_client *client = st->client; |
| 348 | char *rxbuf; |
| 349 | |
| 350 | if (st->current_mode->numvals == 0) |
| 351 | return 0; |
| 352 | rxbuf = kmalloc(st->current_mode->numvals*2, GFP_KERNEL); |
| 353 | if (rxbuf == NULL) |
| 354 | return -ENOMEM; |
| 355 | |
| 356 | /* Interpretation depends on whether these are signed or not!*/ |
| 357 | /* Assume not for now */ |
| 358 | ret = i2c_master_recv(client, rxbuf, st->current_mode->numvals*2); |
| 359 | |
| 360 | if (ret < 0) |
| 361 | return ret; |
| 362 | for (i = 0; i < st->current_mode->numvals; i++) |
| 363 | len += sprintf(buf+len, "%d ", |
| 364 | ((int)(rxbuf[i*2+0]&0x0F) << 8) |
| 365 | + ((int)(rxbuf[i*2+1]))); |
| 366 | kfree(rxbuf); |
| 367 | len += sprintf(buf + len, "\n"); |
| 368 | |
| 369 | return len; |
| 370 | } |
| 371 | |
| 372 | static ssize_t max1363_scan(struct device *dev, |
| 373 | struct device_attribute *attr, |
| 374 | char *buf) |
| 375 | { |
| 376 | struct iio_dev *dev_info = dev_get_drvdata(dev); |
| 377 | int ret; |
| 378 | |
| 379 | mutex_lock(&dev_info->mlock); |
| 380 | if (dev_info->currentmode == INDIO_RING_TRIGGERED) |
| 381 | ret = max1363_scan_from_ring(dev, attr, buf); |
| 382 | else |
| 383 | ret = max1363_scan_direct(dev, attr, buf); |
| 384 | mutex_unlock(&dev_info->mlock); |
| 385 | |
| 386 | return ret; |
| 387 | } |
| 388 | |
| 389 | /* Cannot query the device, so use local copy of state */ |
| 390 | static ssize_t max1363_show_scan_mode(struct device *dev, |
| 391 | struct device_attribute *attr, |
| 392 | char *buf) |
| 393 | { |
| 394 | struct iio_dev *dev_info = dev_get_drvdata(dev); |
| 395 | struct max1363_state *st = dev_info->dev_data; |
| 396 | |
| 397 | return sprintf(buf, "%s\n", st->current_mode->name); |
| 398 | } |
| 399 | |
| 400 | static const struct max1363_mode |
| 401 | *__max1363_find_mode_in_ci(const struct max1363_chip_info *info, |
| 402 | const char *buf) |
| 403 | { |
| 404 | int i; |
| 405 | for (i = 0; i < info->num_modes; i++) |
| 406 | if (strcmp(max1363_mode_table[info->mode_list[i]].name, buf) |
| 407 | == 0) |
| 408 | return &max1363_mode_table[info->mode_list[i]]; |
| 409 | return NULL; |
| 410 | } |
| 411 | |
| 412 | static ssize_t max1363_store_scan_mode(struct device *dev, |
| 413 | struct device_attribute *attr, |
| 414 | const char *buf, |
| 415 | size_t len) |
| 416 | { |
| 417 | struct iio_dev *dev_info = dev_get_drvdata(dev); |
| 418 | struct max1363_state *st = dev_info->dev_data; |
| 419 | const struct max1363_mode *new_mode; |
| 420 | int ret; |
| 421 | |
| 422 | mutex_lock(&dev_info->mlock); |
| 423 | new_mode = NULL; |
| 424 | /* Avoid state changes if a ring buffer is enabled */ |
| 425 | if (!iio_ring_enabled(dev_info)) { |
| 426 | new_mode |
| 427 | = __max1363_find_mode_in_ci(st->chip_info, buf); |
| 428 | if (!new_mode) { |
| 429 | ret = -EINVAL; |
| 430 | goto error_ret; |
| 431 | } |
| 432 | st->current_mode = new_mode; |
| 433 | ret = max1363_set_scan_mode(st); |
| 434 | if (ret) |
| 435 | goto error_ret; |
| 436 | } else { |
| 437 | ret = -EBUSY; |
| 438 | goto error_ret; |
| 439 | } |
| 440 | mutex_unlock(&dev_info->mlock); |
| 441 | |
| 442 | return len; |
| 443 | |
| 444 | error_ret: |
| 445 | mutex_unlock(&dev_info->mlock); |
| 446 | |
| 447 | return ret; |
| 448 | } |
| 449 | |
| 450 | IIO_DEV_ATTR_AVAIL_SCAN_MODES(max1363_show_av_scan_modes); |
| 451 | IIO_DEV_ATTR_SCAN_MODE(S_IRUGO | S_IWUSR, |
| 452 | max1363_show_scan_mode, |
| 453 | max1363_store_scan_mode); |
| 454 | |
| 455 | IIO_DEV_ATTR_SCAN(max1363_scan); |
| 456 | |
| 457 | static ssize_t max1363_show_name(struct device *dev, |
| 458 | struct device_attribute *attr, |
| 459 | char *buf) |
| 460 | { |
| 461 | struct iio_dev *dev_info = dev_get_drvdata(dev); |
| 462 | struct max1363_state *st = dev_info->dev_data; |
| 463 | return sprintf(buf, "%s\n", st->chip_info->name); |
| 464 | } |
| 465 | |
| 466 | IIO_DEVICE_ATTR(name, S_IRUGO, max1363_show_name, NULL, 0); |
| 467 | |
| 468 | /*name export */ |
| 469 | |
| 470 | static struct attribute *max1363_attributes[] = { |
| 471 | &iio_dev_attr_available_scan_modes.dev_attr.attr, |
| 472 | &iio_dev_attr_scan_mode.dev_attr.attr, |
| 473 | &iio_dev_attr_scan.dev_attr.attr, |
| 474 | &iio_dev_attr_name.dev_attr.attr, |
| 475 | NULL, |
| 476 | }; |
| 477 | |
| 478 | static const struct attribute_group max1363_attribute_group = { |
| 479 | .attrs = max1363_attributes, |
| 480 | }; |
| 481 | |
| 482 | static int __devinit max1363_probe(struct i2c_client *client, |
| 483 | const struct i2c_device_id *id) |
| 484 | { |
| 485 | int ret, i, regdone = 0; |
| 486 | struct max1363_state *st = kzalloc(sizeof(*st), GFP_KERNEL); |
| 487 | if (st == NULL) { |
| 488 | ret = -ENOMEM; |
| 489 | goto error_ret; |
| 490 | } |
| 491 | |
| 492 | /* this is only used for device removal purposes */ |
| 493 | i2c_set_clientdata(client, st); |
| 494 | |
| 495 | atomic_set(&st->protect_ring, 0); |
| 496 | |
| 497 | /* Find the chip model specific data */ |
| 498 | for (i = 0; i < ARRAY_SIZE(max1363_chip_info_tbl); i++) |
| 499 | if (!strcmp(max1363_chip_info_tbl[i].name, id->name)) { |
| 500 | st->chip_info = &max1363_chip_info_tbl[i]; |
| 501 | break; |
| 502 | }; |
| 503 | /* Unsupported chip */ |
| 504 | if (!st->chip_info) { |
| 505 | dev_err(&client->dev, "%s is not supported\n", id->name); |
| 506 | ret = -ENODEV; |
| 507 | goto error_free_st; |
| 508 | } |
| 509 | st->reg = regulator_get(&client->dev, "vcc"); |
| 510 | if (!IS_ERR(st->reg)) { |
| 511 | ret = regulator_enable(st->reg); |
| 512 | if (ret) |
| 513 | goto error_put_reg; |
| 514 | } |
| 515 | st->client = client; |
| 516 | |
| 517 | st->indio_dev = iio_allocate_device(); |
| 518 | if (st->indio_dev == NULL) { |
| 519 | ret = -ENOMEM; |
| 520 | goto error_disable_reg; |
| 521 | } |
| 522 | |
| 523 | /* Estabilish that the iio_dev is a child of the i2c device */ |
| 524 | st->indio_dev->dev.parent = &client->dev; |
| 525 | st->indio_dev->attrs = &max1363_attribute_group; |
| 526 | st->indio_dev->dev_data = (void *)(st); |
| 527 | st->indio_dev->driver_module = THIS_MODULE; |
| 528 | st->indio_dev->modes = INDIO_DIRECT_MODE; |
| 529 | |
| 530 | ret = max1363_initial_setup(st); |
| 531 | if (ret) |
| 532 | goto error_free_device; |
| 533 | |
| 534 | ret = max1363_register_ring_funcs_and_init(st->indio_dev); |
| 535 | if (ret) |
| 536 | goto error_free_device; |
| 537 | |
| 538 | ret = iio_device_register(st->indio_dev); |
| 539 | if (ret) |
| 540 | goto error_cleanup_ring; |
| 541 | regdone = 1; |
| 542 | ret = max1363_initialize_ring(st->indio_dev->ring); |
| 543 | if (ret) |
| 544 | goto error_cleanup_ring; |
| 545 | return 0; |
| 546 | error_cleanup_ring: |
| 547 | max1363_ring_cleanup(st->indio_dev); |
| 548 | error_free_device: |
| 549 | if (!regdone) |
| 550 | iio_free_device(st->indio_dev); |
| 551 | else |
| 552 | iio_device_unregister(st->indio_dev); |
| 553 | error_disable_reg: |
| 554 | if (!IS_ERR(st->reg)) |
| 555 | regulator_disable(st->reg); |
| 556 | error_put_reg: |
| 557 | if (!IS_ERR(st->reg)) |
| 558 | regulator_put(st->reg); |
| 559 | error_free_st: |
| 560 | kfree(st); |
| 561 | |
| 562 | error_ret: |
| 563 | return ret; |
| 564 | } |
| 565 | |
| 566 | static int max1363_remove(struct i2c_client *client) |
| 567 | { |
| 568 | struct max1363_state *st = i2c_get_clientdata(client); |
| 569 | struct iio_dev *indio_dev = st->indio_dev; |
| 570 | max1363_uninitialize_ring(indio_dev->ring); |
| 571 | max1363_ring_cleanup(indio_dev); |
| 572 | iio_device_unregister(indio_dev); |
| 573 | if (!IS_ERR(st->reg)) { |
| 574 | regulator_disable(st->reg); |
| 575 | regulator_put(st->reg); |
| 576 | } |
| 577 | kfree(st); |
| 578 | |
| 579 | return 0; |
| 580 | } |
| 581 | |
| 582 | static const struct i2c_device_id max1363_id[] = { |
| 583 | { "max1361", max1361 }, |
| 584 | { "max1362", max1362 }, |
| 585 | { "max1363", max1363 }, |
| 586 | { "max1364", max1364 }, |
| 587 | { "max1136", max1136 }, |
| 588 | { "max1137", max1137 }, |
| 589 | { "max1138", max1138 }, |
| 590 | { "max1139", max1139 }, |
| 591 | { "max1236", max1236 }, |
| 592 | { "max1237", max1237 }, |
| 593 | { "max1238", max1238 }, |
| 594 | { "max1239", max1239 }, |
| 595 | {} |
| 596 | }; |
| 597 | |
| 598 | MODULE_DEVICE_TABLE(i2c, max1363_id); |
| 599 | |
| 600 | static struct i2c_driver max1363_driver = { |
| 601 | .driver = { |
| 602 | .name = "max1363", |
| 603 | }, |
| 604 | .probe = max1363_probe, |
| 605 | .remove = max1363_remove, |
| 606 | .id_table = max1363_id, |
| 607 | }; |
| 608 | |
| 609 | static __init int max1363_init(void) |
| 610 | { |
| 611 | return i2c_add_driver(&max1363_driver); |
| 612 | } |
| 613 | |
| 614 | static __exit void max1363_exit(void) |
| 615 | { |
| 616 | i2c_del_driver(&max1363_driver); |
| 617 | } |
| 618 | |
| 619 | MODULE_AUTHOR("Jonathan Cameron <jic23@cam.ac.uk>"); |
| 620 | MODULE_DESCRIPTION("Maxim 1363 ADC"); |
| 621 | MODULE_LICENSE("GPL v2"); |
| 622 | |
| 623 | module_init(max1363_init); |
| 624 | module_exit(max1363_exit); |