1 /* 2 * Copyright (c) 2015 Intel Corporation 3 * 4 * Driver for TXC PA12203001 Proximity and Ambient Light Sensor. 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 as published by 8 * the Free Software Foundation. 9 * To do: Interrupt support. 10 */ 11 12 #include <linux/kernel.h> 13 #include <linux/module.h> 14 #include <linux/acpi.h> 15 #include <linux/delay.h> 16 #include <linux/i2c.h> 17 #include <linux/iio/iio.h> 18 #include <linux/iio/sysfs.h> 19 #include <linux/mutex.h> 20 #include <linux/pm.h> 21 #include <linux/pm_runtime.h> 22 #include <linux/regmap.h> 23 24 #define PA12203001_DRIVER_NAME "pa12203001" 25 26 #define PA12203001_REG_CFG0 0x00 27 #define PA12203001_REG_CFG1 0x01 28 #define PA12203001_REG_CFG2 0x02 29 #define PA12203001_REG_CFG3 0x03 30 31 #define PA12203001_REG_ADL 0x0b 32 #define PA12203001_REG_PDH 0x0e 33 34 #define PA12203001_REG_POFS 0x10 35 #define PA12203001_REG_PSET 0x11 36 37 #define PA12203001_ALS_EN_MASK BIT(0) 38 #define PA12203001_PX_EN_MASK BIT(1) 39 #define PA12203001_PX_NORMAL_MODE_MASK GENMASK(7, 6) 40 #define PA12203001_AFSR_MASK GENMASK(5, 4) 41 #define PA12203001_AFSR_SHIFT 4 42 43 #define PA12203001_PSCAN 0x03 44 45 /* als range 31000, ps, als disabled */ 46 #define PA12203001_REG_CFG0_DEFAULT 0x30 47 48 /* led current: 100 mA */ 49 #define PA12203001_REG_CFG1_DEFAULT 0x20 50 51 /* ps mode: normal, interrupts not active */ 52 #define PA12203001_REG_CFG2_DEFAULT 0xcc 53 54 #define PA12203001_REG_CFG3_DEFAULT 0x00 55 56 #define PA12203001_SLEEP_DELAY_MS 3000 57 58 #define PA12203001_CHIP_ENABLE 0xff 59 #define PA12203001_CHIP_DISABLE 0x00 60 61 /* available scales: corresponding to [500, 4000, 7000, 31000] lux */ 62 static const int pa12203001_scales[] = { 7629, 61036, 106813, 473029}; 63 64 struct pa12203001_data { 65 struct i2c_client *client; 66 67 /* protect device states */ 68 struct mutex lock; 69 70 bool als_enabled; 71 bool px_enabled; 72 bool als_needs_enable; 73 bool px_needs_enable; 74 75 struct regmap *map; 76 }; 77 78 static const struct { 79 u8 reg; 80 u8 val; 81 } regvals[] = { 82 {PA12203001_REG_CFG0, PA12203001_REG_CFG0_DEFAULT}, 83 {PA12203001_REG_CFG1, PA12203001_REG_CFG1_DEFAULT}, 84 {PA12203001_REG_CFG2, PA12203001_REG_CFG2_DEFAULT}, 85 {PA12203001_REG_CFG3, PA12203001_REG_CFG3_DEFAULT}, 86 {PA12203001_REG_PSET, PA12203001_PSCAN}, 87 }; 88 89 static IIO_CONST_ATTR(in_illuminance_scale_available, 90 "0.007629 0.061036 0.106813 0.473029"); 91 92 static struct attribute *pa12203001_attrs[] = { 93 &iio_const_attr_in_illuminance_scale_available.dev_attr.attr, 94 NULL 95 }; 96 97 static const struct attribute_group pa12203001_attr_group = { 98 .attrs = pa12203001_attrs, 99 }; 100 101 static const struct iio_chan_spec pa12203001_channels[] = { 102 { 103 .type = IIO_LIGHT, 104 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | 105 BIT(IIO_CHAN_INFO_SCALE), 106 }, 107 { 108 .type = IIO_PROXIMITY, 109 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), 110 } 111 }; 112 113 static const struct regmap_range pa12203001_volatile_regs_ranges[] = { 114 regmap_reg_range(PA12203001_REG_ADL, PA12203001_REG_ADL + 1), 115 regmap_reg_range(PA12203001_REG_PDH, PA12203001_REG_PDH), 116 }; 117 118 static const struct regmap_access_table pa12203001_volatile_regs = { 119 .yes_ranges = pa12203001_volatile_regs_ranges, 120 .n_yes_ranges = ARRAY_SIZE(pa12203001_volatile_regs_ranges), 121 }; 122 123 static const struct regmap_config pa12203001_regmap_config = { 124 .reg_bits = 8, 125 .val_bits = 8, 126 .max_register = PA12203001_REG_PSET, 127 .cache_type = REGCACHE_RBTREE, 128 .volatile_table = &pa12203001_volatile_regs, 129 }; 130 131 static inline int pa12203001_als_enable(struct pa12203001_data *data, u8 enable) 132 { 133 int ret; 134 135 ret = regmap_update_bits(data->map, PA12203001_REG_CFG0, 136 PA12203001_ALS_EN_MASK, enable); 137 if (ret < 0) 138 return ret; 139 140 data->als_enabled = !!enable; 141 142 return 0; 143 } 144 145 static inline int pa12203001_px_enable(struct pa12203001_data *data, u8 enable) 146 { 147 int ret; 148 149 ret = regmap_update_bits(data->map, PA12203001_REG_CFG0, 150 PA12203001_PX_EN_MASK, enable); 151 if (ret < 0) 152 return ret; 153 154 data->px_enabled = !!enable; 155 156 return 0; 157 } 158 159 static int pa12203001_set_power_state(struct pa12203001_data *data, bool on, 160 u8 mask) 161 { 162 #ifdef CONFIG_PM 163 int ret; 164 165 if (on && (mask & PA12203001_ALS_EN_MASK)) { 166 mutex_lock(&data->lock); 167 if (data->px_enabled) { 168 ret = pa12203001_als_enable(data, 169 PA12203001_ALS_EN_MASK); 170 if (ret < 0) 171 goto err; 172 } else { 173 data->als_needs_enable = true; 174 } 175 mutex_unlock(&data->lock); 176 } 177 178 if (on && (mask & PA12203001_PX_EN_MASK)) { 179 mutex_lock(&data->lock); 180 if (data->als_enabled) { 181 ret = pa12203001_px_enable(data, PA12203001_PX_EN_MASK); 182 if (ret < 0) 183 goto err; 184 } else { 185 data->px_needs_enable = true; 186 } 187 mutex_unlock(&data->lock); 188 } 189 190 if (on) { 191 ret = pm_runtime_get_sync(&data->client->dev); 192 if (ret < 0) 193 pm_runtime_put_noidle(&data->client->dev); 194 195 } else { 196 pm_runtime_mark_last_busy(&data->client->dev); 197 ret = pm_runtime_put_autosuspend(&data->client->dev); 198 } 199 200 return ret; 201 202 err: 203 mutex_unlock(&data->lock); 204 return ret; 205 206 #endif 207 return 0; 208 } 209 210 static int pa12203001_read_raw(struct iio_dev *indio_dev, 211 struct iio_chan_spec const *chan, int *val, 212 int *val2, long mask) 213 { 214 struct pa12203001_data *data = iio_priv(indio_dev); 215 int ret; 216 u8 dev_mask; 217 unsigned int reg_byte; 218 __le16 reg_word; 219 220 switch (mask) { 221 case IIO_CHAN_INFO_RAW: 222 switch (chan->type) { 223 case IIO_LIGHT: 224 dev_mask = PA12203001_ALS_EN_MASK; 225 ret = pa12203001_set_power_state(data, true, dev_mask); 226 if (ret < 0) 227 return ret; 228 /* 229 * ALS ADC value is stored in registers 230 * PA12203001_REG_ADL and in PA12203001_REG_ADL + 1. 231 */ 232 ret = regmap_bulk_read(data->map, PA12203001_REG_ADL, 233 ®_word, 2); 234 if (ret < 0) 235 goto reg_err; 236 237 *val = le16_to_cpu(reg_word); 238 ret = pa12203001_set_power_state(data, false, dev_mask); 239 if (ret < 0) 240 return ret; 241 break; 242 case IIO_PROXIMITY: 243 dev_mask = PA12203001_PX_EN_MASK; 244 ret = pa12203001_set_power_state(data, true, dev_mask); 245 if (ret < 0) 246 return ret; 247 ret = regmap_read(data->map, PA12203001_REG_PDH, 248 ®_byte); 249 if (ret < 0) 250 goto reg_err; 251 252 *val = reg_byte; 253 ret = pa12203001_set_power_state(data, false, dev_mask); 254 if (ret < 0) 255 return ret; 256 break; 257 default: 258 return -EINVAL; 259 } 260 return IIO_VAL_INT; 261 case IIO_CHAN_INFO_SCALE: 262 ret = regmap_read(data->map, PA12203001_REG_CFG0, ®_byte); 263 if (ret < 0) 264 return ret; 265 *val = 0; 266 reg_byte = (reg_byte & PA12203001_AFSR_MASK); 267 *val2 = pa12203001_scales[reg_byte >> 4]; 268 return IIO_VAL_INT_PLUS_MICRO; 269 default: 270 return -EINVAL; 271 } 272 273 reg_err: 274 pa12203001_set_power_state(data, false, dev_mask); 275 return ret; 276 } 277 278 static int pa12203001_write_raw(struct iio_dev *indio_dev, 279 struct iio_chan_spec const *chan, int val, 280 int val2, long mask) 281 { 282 struct pa12203001_data *data = iio_priv(indio_dev); 283 int i, ret, new_val; 284 unsigned int reg_byte; 285 286 switch (mask) { 287 case IIO_CHAN_INFO_SCALE: 288 ret = regmap_read(data->map, PA12203001_REG_CFG0, ®_byte); 289 if (val != 0 || ret < 0) 290 return -EINVAL; 291 for (i = 0; i < ARRAY_SIZE(pa12203001_scales); i++) { 292 if (val2 == pa12203001_scales[i]) { 293 new_val = i << PA12203001_AFSR_SHIFT; 294 return regmap_update_bits(data->map, 295 PA12203001_REG_CFG0, 296 PA12203001_AFSR_MASK, 297 new_val); 298 } 299 } 300 break; 301 default: 302 break; 303 } 304 305 return -EINVAL; 306 } 307 308 static const struct iio_info pa12203001_info = { 309 .driver_module = THIS_MODULE, 310 .read_raw = pa12203001_read_raw, 311 .write_raw = pa12203001_write_raw, 312 .attrs = &pa12203001_attr_group, 313 }; 314 315 static int pa12203001_init(struct iio_dev *indio_dev) 316 { 317 struct pa12203001_data *data = iio_priv(indio_dev); 318 int i, ret; 319 320 for (i = 0; i < ARRAY_SIZE(regvals); i++) { 321 ret = regmap_write(data->map, regvals[i].reg, regvals[i].val); 322 if (ret < 0) 323 return ret; 324 } 325 326 return 0; 327 } 328 329 static int pa12203001_power_chip(struct iio_dev *indio_dev, u8 state) 330 { 331 struct pa12203001_data *data = iio_priv(indio_dev); 332 int ret; 333 334 mutex_lock(&data->lock); 335 ret = pa12203001_als_enable(data, state); 336 if (ret < 0) 337 goto out; 338 339 ret = pa12203001_px_enable(data, state); 340 341 out: 342 mutex_unlock(&data->lock); 343 return ret; 344 } 345 346 static int pa12203001_probe(struct i2c_client *client, 347 const struct i2c_device_id *id) 348 { 349 struct pa12203001_data *data; 350 struct iio_dev *indio_dev; 351 int ret; 352 353 indio_dev = devm_iio_device_alloc(&client->dev, 354 sizeof(struct pa12203001_data)); 355 if (!indio_dev) 356 return -ENOMEM; 357 358 data = iio_priv(indio_dev); 359 i2c_set_clientdata(client, indio_dev); 360 data->client = client; 361 362 data->map = devm_regmap_init_i2c(client, &pa12203001_regmap_config); 363 if (IS_ERR(data->map)) 364 return PTR_ERR(data->map); 365 366 mutex_init(&data->lock); 367 368 indio_dev->dev.parent = &client->dev; 369 indio_dev->info = &pa12203001_info; 370 indio_dev->name = PA12203001_DRIVER_NAME; 371 indio_dev->channels = pa12203001_channels; 372 indio_dev->num_channels = ARRAY_SIZE(pa12203001_channels); 373 indio_dev->modes = INDIO_DIRECT_MODE; 374 375 ret = pa12203001_init(indio_dev); 376 if (ret < 0) 377 return ret; 378 379 ret = pa12203001_power_chip(indio_dev, PA12203001_CHIP_ENABLE); 380 if (ret < 0) 381 return ret; 382 383 ret = pm_runtime_set_active(&client->dev); 384 if (ret < 0) { 385 pa12203001_power_chip(indio_dev, PA12203001_CHIP_DISABLE); 386 return ret; 387 } 388 389 pm_runtime_enable(&client->dev); 390 pm_runtime_set_autosuspend_delay(&client->dev, 391 PA12203001_SLEEP_DELAY_MS); 392 pm_runtime_use_autosuspend(&client->dev); 393 394 return iio_device_register(indio_dev); 395 } 396 397 static int pa12203001_remove(struct i2c_client *client) 398 { 399 struct iio_dev *indio_dev = i2c_get_clientdata(client); 400 401 iio_device_unregister(indio_dev); 402 403 pm_runtime_disable(&client->dev); 404 pm_runtime_set_suspended(&client->dev); 405 406 return pa12203001_power_chip(indio_dev, PA12203001_CHIP_DISABLE); 407 } 408 409 #if defined(CONFIG_PM_SLEEP) || defined(CONFIG_PM) 410 static int pa12203001_suspend(struct device *dev) 411 { 412 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); 413 414 return pa12203001_power_chip(indio_dev, PA12203001_CHIP_DISABLE); 415 } 416 #endif 417 418 #ifdef CONFIG_PM_SLEEP 419 static int pa12203001_resume(struct device *dev) 420 { 421 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); 422 423 return pa12203001_power_chip(indio_dev, PA12203001_CHIP_ENABLE); 424 } 425 #endif 426 427 #ifdef CONFIG_PM 428 static int pa12203001_runtime_resume(struct device *dev) 429 { 430 struct pa12203001_data *data; 431 432 data = iio_priv(i2c_get_clientdata(to_i2c_client(dev))); 433 434 mutex_lock(&data->lock); 435 if (data->als_needs_enable) { 436 pa12203001_als_enable(data, PA12203001_ALS_EN_MASK); 437 data->als_needs_enable = false; 438 } 439 if (data->px_needs_enable) { 440 pa12203001_px_enable(data, PA12203001_PX_EN_MASK); 441 data->px_needs_enable = false; 442 } 443 mutex_unlock(&data->lock); 444 445 return 0; 446 } 447 #endif 448 449 static const struct dev_pm_ops pa12203001_pm_ops = { 450 SET_SYSTEM_SLEEP_PM_OPS(pa12203001_suspend, pa12203001_resume) 451 SET_RUNTIME_PM_OPS(pa12203001_suspend, pa12203001_runtime_resume, NULL) 452 }; 453 454 static const struct acpi_device_id pa12203001_acpi_match[] = { 455 { "TXCPA122", 0}, 456 {} 457 }; 458 459 MODULE_DEVICE_TABLE(acpi, pa12203001_acpi_match); 460 461 static const struct i2c_device_id pa12203001_id[] = { 462 {"txcpa122", 0}, 463 {} 464 }; 465 466 MODULE_DEVICE_TABLE(i2c, pa12203001_id); 467 468 static struct i2c_driver pa12203001_driver = { 469 .driver = { 470 .name = PA12203001_DRIVER_NAME, 471 .pm = &pa12203001_pm_ops, 472 .acpi_match_table = ACPI_PTR(pa12203001_acpi_match), 473 }, 474 .probe = pa12203001_probe, 475 .remove = pa12203001_remove, 476 .id_table = pa12203001_id, 477 478 }; 479 module_i2c_driver(pa12203001_driver); 480 481 MODULE_AUTHOR("Adriana Reus <adriana.reus@intel.com>"); 482 MODULE_DESCRIPTION("Driver for TXC PA12203001 Proximity and Light Sensor"); 483 MODULE_LICENSE("GPL v2"); 484