Tirupathi Reddy | e5b5427 | 2017-09-25 12:21:03 +0530 | [diff] [blame] | 1 | /* Copyright (c) 2017 The Linux Foundation. All rights reserved. |
| 2 | * |
| 3 | * This program is free software; you can redistribute it and/or modify |
| 4 | * it under the terms of the GNU General Public License version 2 and |
| 5 | * only version 2 as published by the Free Software Foundation. |
| 6 | * |
| 7 | * This program is distributed in the hope that it will be useful, |
| 8 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 9 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 10 | * GNU General Public License for more details. |
| 11 | */ |
| 12 | |
| 13 | #define pr_fmt(fmt) "%s: " fmt, __func__ |
| 14 | |
| 15 | #include <linux/alarmtimer.h> |
| 16 | #include <linux/debugfs.h> |
| 17 | #include <linux/device.h> |
| 18 | #include <linux/errno.h> |
| 19 | #include <linux/i2c.h> |
| 20 | #include <linux/module.h> |
| 21 | #include <linux/mutex.h> |
| 22 | #include <linux/of.h> |
| 23 | #include <linux/of_gpio.h> |
| 24 | #include <linux/platform_device.h> |
| 25 | #include <linux/pm_wakeup.h> |
| 26 | #include <linux/power_supply.h> |
| 27 | #include <linux/regmap.h> |
| 28 | #include <linux/rtc.h> |
| 29 | |
| 30 | #define NX30P6093_ID_REG 0x0 |
| 31 | #define NX30P6093_VENDOR_ID_MASK GENMASK(7, 3) |
| 32 | #define NX30P6093_VENDOR_ID_SHIFT 3 |
| 33 | #define NX30P6093_VERSION_ID_MASK GENMASK(2, 0) |
| 34 | |
| 35 | #define NX30P6093_ENABLE_REG 0x01 |
| 36 | #define NX30P6093_DETECT_EN BIT(6) |
| 37 | |
| 38 | #define NX30P6093_STATUS_REG 0x02 |
| 39 | #define NX30P6093_PWRON_STS BIT(7) |
| 40 | #define NX30P6093_IMPEDANCE_MASK GENMASK(6, 5) |
| 41 | #define NX30P6093_IMPEDANCE_SHIFT 5 |
| 42 | #define NX30P6093_IMPEDANCE_GOOD_VAL 1 |
| 43 | #define NX30P6093_IMPEDANCE_BAD_VAL 3 |
| 44 | |
| 45 | #define NX30P6093_INTR_MASK_REG 0x04 |
| 46 | #define NX30P6093_OVER_TAG_STS_INTR_MASK BIT(6) |
| 47 | #define NX30P6093_TMR_OUT_STS_INTR_MASK BIT(5) |
| 48 | |
| 49 | #define NX30P6093_VIN_ISOURCE_REG 0x06 |
| 50 | #define NX30P6093_VIN_ISOURCE_MASK GENMASK(3, 0) |
| 51 | |
| 52 | #define NX30P6093_ISOURCE_TIMING_REG 0x07 |
| 53 | #define NX30P6093_ISOURCE_TDET_MASK GENMASK(7, 4) |
| 54 | #define NX30P6093_ISOURCE_TDET_SHIFT 4 |
| 55 | #define NX30P6093_ISOURCE_TDUTY_MASK GENMASK(3, 0) |
| 56 | |
| 57 | #define NX30P6093_VIN_VOLTAGE_TAG_REG 0x09 |
| 58 | #define NX30P6093_VIN_VOLTAGE_TAG_MASK GENMASK(7, 0) |
| 59 | |
| 60 | #define NX30P6093_SLEW_RATE_TUNE_REG 0x0f |
| 61 | |
| 62 | /* short duration is 5sec and long duration is 5hrs */ |
| 63 | #define NX30P6093_LONG_WAKEUP_SEC 18000 |
| 64 | #define NX30P6093_SHORT_WAKEUP_MS 5000 |
| 65 | |
| 66 | /* Default Tduty = 5mins when always-on detection is configured */ |
| 67 | #define NX30P6093_ISOURCE_ALWAYS_ON_TDUTY_MS 300000 |
| 68 | |
| 69 | /* configuration data */ |
| 70 | #define NX30P6093_VIN_ISOURCE_VAL 0xd |
| 71 | #define NX30P6093_VIN_VOLTAGE_TAG_VAL 0xad |
| 72 | #define NX30P6093_ISOURCE_TDET_VAL 0x5 |
| 73 | #define NX30P6093_ISOURCE_TDUTY_VAL 0x0 |
| 74 | #define NX30P6093_ISOURCE_TDET_MS 10 |
| 75 | |
| 76 | struct nx30p6093_info { |
| 77 | struct device *dev; |
| 78 | struct regmap *regmap; |
| 79 | struct power_supply *usb_psy; |
| 80 | struct alarm alarm_timer; |
| 81 | struct delayed_work config_impedance_detect; |
| 82 | struct mutex lock; |
| 83 | struct dentry *debugfs; |
| 84 | u8 tduty_val; |
| 85 | int irq; |
| 86 | |
| 87 | /* status data */ |
| 88 | bool irq_waiting; |
| 89 | bool high_impedance; |
| 90 | bool detection_on; |
| 91 | bool always_on; |
| 92 | bool use_alarm; |
| 93 | bool suspended; |
| 94 | |
| 95 | /* timer configuration */ |
| 96 | u64 long_wakeup_ms; |
| 97 | u64 short_wakeup_ms; |
| 98 | }; |
| 99 | |
| 100 | static const int nx30p6093_tduty_ms[] = {0, 10, 20, 50, 100, 200, 500, 1000, |
| 101 | 2000, 3000, 6000, 12000, 30000, 60000, |
| 102 | 120000, 300000}; |
| 103 | |
| 104 | static const struct regmap_config nx30p6093_regmap_config = { |
| 105 | .reg_bits = 8, |
| 106 | .val_bits = 8, |
| 107 | .max_register = NX30P6093_SLEW_RATE_TUNE_REG, |
| 108 | }; |
| 109 | |
| 110 | static int nx30p6093_dump_regs(struct nx30p6093_info *info) |
| 111 | { |
| 112 | unsigned int val; |
| 113 | int i, rc = 0; |
| 114 | |
| 115 | for (i = 0; i <= NX30P6093_SLEW_RATE_TUNE_REG; ++i) { |
| 116 | rc = regmap_read(info->regmap, i, &val); |
| 117 | if (rc < 0) |
| 118 | return rc; |
| 119 | pr_debug("NX30P6093(0x%02x) = 0x%02x\n", i, (uint8_t)val); |
| 120 | } |
| 121 | |
| 122 | return rc; |
| 123 | } |
| 124 | |
| 125 | static inline void nx30p6093_config_alarm(struct nx30p6093_info *info, |
| 126 | u64 wakeup_ms) |
| 127 | { |
| 128 | if (!info->use_alarm) |
| 129 | return; |
| 130 | |
| 131 | alarm_start_relative(&info->alarm_timer, ms_to_ktime(wakeup_ms)); |
| 132 | } |
| 133 | |
| 134 | static int nx30p6093_impedance_detect(struct nx30p6093_info *info, bool enable) |
| 135 | { |
| 136 | int rc = 0; |
| 137 | |
| 138 | if (enable == info->detection_on) |
| 139 | return rc; |
| 140 | |
| 141 | rc = regmap_update_bits(info->regmap, NX30P6093_ENABLE_REG, |
| 142 | NX30P6093_DETECT_EN, |
| 143 | enable ? NX30P6093_DETECT_EN : 0); |
| 144 | if (rc < 0) { |
| 145 | pr_err("failed to %s VIN impedance detection, rc=%d\n", |
| 146 | enable ? "enable" : "disable", rc); |
| 147 | return rc; |
| 148 | } |
| 149 | |
| 150 | /* wait for 3ms for HW activation and enters detection standby mode */ |
| 151 | usleep_range(3000, 3100); |
| 152 | |
| 153 | /* config Isource to VIN */ |
| 154 | rc = regmap_update_bits(info->regmap, NX30P6093_VIN_ISOURCE_REG, |
| 155 | NX30P6093_VIN_ISOURCE_MASK, |
| 156 | enable ? NX30P6093_VIN_ISOURCE_VAL : 0); |
| 157 | if (rc < 0) { |
| 158 | pr_err("failed to configure Vin Isource register, rc=%d\n", rc); |
| 159 | return rc; |
| 160 | } |
| 161 | |
| 162 | info->detection_on = enable; |
| 163 | nx30p6093_dump_regs(info); |
| 164 | |
| 165 | return rc; |
| 166 | } |
| 167 | |
| 168 | static int nx30p6093_read_impedance_status(struct nx30p6093_info *info) |
| 169 | { |
| 170 | union power_supply_propval psp_val; |
| 171 | unsigned int val; |
| 172 | u8 impedance; |
| 173 | int rc; |
| 174 | |
| 175 | /* Read status register */ |
| 176 | rc = regmap_read(info->regmap, NX30P6093_STATUS_REG, &val); |
| 177 | if (rc < 0) { |
| 178 | pr_err("failed to read status register, rc=%d\n", rc); |
| 179 | return rc; |
| 180 | } |
| 181 | |
| 182 | if (val & NX30P6093_PWRON_STS) { |
| 183 | /* VBUS present */ |
| 184 | return rc; |
| 185 | } |
| 186 | |
| 187 | impedance = (val & NX30P6093_IMPEDANCE_MASK) |
| 188 | >> NX30P6093_IMPEDANCE_SHIFT; |
| 189 | if (impedance == NX30P6093_IMPEDANCE_GOOD_VAL && info->high_impedance) { |
| 190 | info->high_impedance = false; |
| 191 | |
| 192 | /* enable the type-C CC detection */ |
| 193 | psp_val.intval = 0; |
| 194 | rc = power_supply_set_property(info->usb_psy, |
| 195 | POWER_SUPPLY_PROP_MOISTURE_DETECTED, |
| 196 | &psp_val); |
| 197 | } else if (impedance == NX30P6093_IMPEDANCE_BAD_VAL) { |
| 198 | info->high_impedance = true; |
| 199 | |
| 200 | /* disable the type-C CC detection */ |
| 201 | psp_val.intval = 1; |
| 202 | rc = power_supply_set_property(info->usb_psy, |
| 203 | POWER_SUPPLY_PROP_MOISTURE_DETECTED, |
| 204 | &psp_val); |
| 205 | } |
| 206 | |
| 207 | return rc; |
| 208 | } |
| 209 | |
| 210 | static irqreturn_t nx30p6093_irq_handler(int irq, void *data) |
| 211 | { |
| 212 | struct nx30p6093_info *info = data; |
| 213 | |
| 214 | mutex_lock(&info->lock); |
| 215 | |
| 216 | info->irq_waiting = true; |
| 217 | if (info->suspended) { |
| 218 | pr_debug("IRQ triggered before device-resume\n"); |
| 219 | disable_irq_nosync(irq); |
| 220 | mutex_unlock(&info->lock); |
| 221 | return IRQ_HANDLED; |
| 222 | } |
| 223 | info->irq_waiting = false; |
| 224 | mutex_unlock(&info->lock); |
| 225 | |
| 226 | nx30p6093_read_impedance_status(info); |
| 227 | |
| 228 | if (info->high_impedance) { |
| 229 | disable_irq_nosync(irq); |
| 230 | /* set up next detection event */ |
| 231 | nx30p6093_config_alarm(info, |
| 232 | NX30P6093_ISOURCE_ALWAYS_ON_TDUTY_MS); |
| 233 | } |
| 234 | |
| 235 | return IRQ_HANDLED; |
| 236 | } |
| 237 | |
| 238 | static int nx30p6093_trigger_impedance_detect(struct nx30p6093_info *info) |
| 239 | { |
| 240 | int rc; |
| 241 | |
| 242 | if (!info->always_on) { |
| 243 | rc = nx30p6093_impedance_detect(info, true); |
| 244 | if (rc < 0) { |
| 245 | pr_err("start impedance detection failed, rc=%d\n", rc); |
| 246 | return rc; |
| 247 | } |
| 248 | |
| 249 | /* wait for the detection complete(Tdet time). */ |
| 250 | usleep_range(NX30P6093_ISOURCE_TDET_MS * USEC_PER_MSEC, |
| 251 | NX30P6093_ISOURCE_TDET_MS * USEC_PER_MSEC + 100); |
| 252 | } |
| 253 | |
| 254 | /* Read and process the detection result. */ |
| 255 | rc = nx30p6093_read_impedance_status(info); |
| 256 | if (rc < 0) |
| 257 | pr_err("impedance status read failed, rc=%d\n", rc); |
| 258 | |
| 259 | if (!info->always_on) { |
| 260 | rc = nx30p6093_impedance_detect(info, false); |
| 261 | if (rc < 0) |
| 262 | pr_err("stop impedance detection failed, rc=%d\n", rc); |
| 263 | } |
| 264 | |
| 265 | return rc; |
| 266 | } |
| 267 | |
| 268 | static void nx30p6093_config_impedance_detect(struct work_struct *work) |
| 269 | { |
| 270 | struct nx30p6093_info *info = container_of(work, struct nx30p6093_info, |
| 271 | config_impedance_detect.work); |
| 272 | u64 wakeup_ms = 0; |
| 273 | |
| 274 | mutex_lock(&info->lock); |
| 275 | if (info->suspended) { |
| 276 | /* |
| 277 | * Defer the work as the device is still in suspend state and |
| 278 | * not yet resumed. |
| 279 | */ |
| 280 | schedule_delayed_work(&info->config_impedance_detect, |
| 281 | msecs_to_jiffies(500)); |
| 282 | mutex_unlock(&info->lock); |
| 283 | return; |
| 284 | } |
| 285 | |
| 286 | nx30p6093_trigger_impedance_detect(info); |
| 287 | |
| 288 | if (info->always_on) { |
| 289 | if (info->high_impedance) { |
| 290 | /* |
| 291 | * Bad impedance is not cleared yet. |
| 292 | * Set up a next detection event. |
| 293 | */ |
| 294 | nx30p6093_config_alarm(info, |
| 295 | NX30P6093_ISOURCE_ALWAYS_ON_TDUTY_MS); |
| 296 | } else { |
| 297 | /* Bad impedance is cleared. Enable detection IRQ */ |
| 298 | enable_irq(info->irq); |
| 299 | } |
| 300 | } else { |
| 301 | wakeup_ms = info->high_impedance ? info->short_wakeup_ms |
| 302 | : info->long_wakeup_ms; |
| 303 | |
| 304 | /* Set up a next detection event */ |
| 305 | nx30p6093_config_alarm(info, wakeup_ms); |
| 306 | } |
| 307 | |
| 308 | mutex_unlock(&info->lock); |
| 309 | pm_relax(info->dev); |
| 310 | } |
| 311 | |
| 312 | static enum alarmtimer_restart |
| 313 | nx30p6093_process_alarm_event(struct alarm *alarm, ktime_t now) |
| 314 | { |
| 315 | struct nx30p6093_info *info = container_of(alarm, struct nx30p6093_info, |
| 316 | alarm_timer); |
| 317 | union power_supply_propval val; |
| 318 | int rc; |
| 319 | |
| 320 | /* Read USB plugged-in */ |
| 321 | rc = power_supply_get_property(info->usb_psy, POWER_SUPPLY_PROP_PRESENT, |
| 322 | &val); |
| 323 | if (rc < 0) { |
| 324 | pr_err("read usb present failed, rc=%d\n", rc); |
| 325 | return ALARMTIMER_RESTART; |
| 326 | } |
| 327 | |
| 328 | if (val.intval) { |
| 329 | /* |
| 330 | * usb present - skip impedance detection and set up |
| 331 | * next detection event. |
| 332 | */ |
| 333 | nx30p6093_config_alarm(info, info->long_wakeup_ms); |
| 334 | } else { |
| 335 | pm_stay_awake(info->dev); |
| 336 | schedule_delayed_work(&info->config_impedance_detect, 0); |
| 337 | } |
| 338 | |
| 339 | return ALARMTIMER_NORESTART; |
| 340 | } |
| 341 | |
| 342 | static int nx30p6093_init_config(struct nx30p6093_info *info) |
| 343 | { |
| 344 | int rc; |
| 345 | u8 val; |
| 346 | |
| 347 | /* Enable OVER_TAG_STATUS interrupt if always-on detection enabled */ |
| 348 | rc = regmap_write(info->regmap, NX30P6093_INTR_MASK_REG, |
| 349 | info->always_on ? NX30P6093_OVER_TAG_STS_INTR_MASK |
| 350 | : 0); |
| 351 | if (rc < 0) { |
| 352 | pr_err("failed to enable timer out status interrupt, rc=%d\n", |
| 353 | rc); |
| 354 | return rc; |
| 355 | } |
| 356 | |
| 357 | /* config Isource timing (Default: 10ms) */ |
| 358 | val = NX30P6093_ISOURCE_TDET_VAL << NX30P6093_ISOURCE_TDET_SHIFT; |
| 359 | rc = regmap_update_bits(info->regmap, NX30P6093_ISOURCE_TIMING_REG, |
| 360 | NX30P6093_ISOURCE_TDET_MASK, val); |
| 361 | if (rc < 0) { |
| 362 | pr_err("failed to configure Isource timing, rc=%d\n", rc); |
| 363 | return rc; |
| 364 | } |
| 365 | |
| 366 | /* |
| 367 | * config Isource Tduty timing; |
| 368 | * Default value: |
| 369 | * 1) One shot - if Periodic detection enabled |
| 370 | * 2) 5 mins - if Always-on detection enabled |
| 371 | */ |
| 372 | rc = regmap_update_bits(info->regmap, NX30P6093_ISOURCE_TIMING_REG, |
| 373 | NX30P6093_ISOURCE_TDUTY_MASK, |
| 374 | info->always_on ? info->tduty_val |
| 375 | : NX30P6093_ISOURCE_TDUTY_VAL); |
| 376 | if (rc < 0) { |
| 377 | pr_err("failed to configure Isource Tduty timing, rc=%d\n", rc); |
| 378 | return rc; |
| 379 | } |
| 380 | |
| 381 | /* config VIN voltage tag (Default: 0xad) */ |
| 382 | rc = regmap_update_bits(info->regmap, NX30P6093_VIN_VOLTAGE_TAG_REG, |
| 383 | NX30P6093_VIN_VOLTAGE_TAG_MASK, |
| 384 | NX30P6093_VIN_VOLTAGE_TAG_VAL); |
| 385 | if (rc < 0) { |
| 386 | pr_err("failed to configure Vin voltage tag register, rc=%d\n", |
| 387 | rc); |
| 388 | return rc; |
| 389 | } |
| 390 | |
| 391 | return 0; |
| 392 | } |
| 393 | |
| 394 | static int nx30p6093_dt_init(struct i2c_client *client, |
| 395 | struct nx30p6093_info *info) |
| 396 | { |
| 397 | struct device_node *of_node = client->dev.of_node; |
| 398 | int i, tduty_ms; |
| 399 | u32 long_wakeup_sec, short_wakeup_ms; |
| 400 | |
| 401 | if (of_property_read_bool(of_node, "nxp,always-on-detect")) { |
| 402 | info->always_on = true; |
| 403 | tduty_ms = NX30P6093_ISOURCE_ALWAYS_ON_TDUTY_MS; |
| 404 | of_property_read_u32(of_node, "nxp,always-on-tduty-ms", |
| 405 | &tduty_ms); |
| 406 | for (i = 0; i < ARRAY_SIZE(nx30p6093_tduty_ms); i++) { |
| 407 | if (tduty_ms <= nx30p6093_tduty_ms[i]) { |
| 408 | info->tduty_val = (uint8_t)i; |
| 409 | break; |
| 410 | } |
| 411 | } |
| 412 | |
| 413 | if (!info->tduty_val) { |
| 414 | pr_err("invalid nxp,always-on-tduty-ms = %d\n", |
| 415 | tduty_ms); |
| 416 | return -EINVAL; |
| 417 | } |
| 418 | } else { |
| 419 | long_wakeup_sec = NX30P6093_LONG_WAKEUP_SEC; |
| 420 | short_wakeup_ms = NX30P6093_SHORT_WAKEUP_MS; |
| 421 | |
| 422 | of_property_read_u32(of_node, "nxp,long-wakeup-sec", |
| 423 | &long_wakeup_sec); |
| 424 | of_property_read_u32(of_node, "nxp,short-wakeup-ms", |
| 425 | &short_wakeup_ms); |
| 426 | if (!long_wakeup_sec || !short_wakeup_ms) { |
| 427 | pr_err("Invalid wakeup timings are configured\n"); |
| 428 | return -EINVAL; |
| 429 | } |
| 430 | |
| 431 | info->long_wakeup_ms = long_wakeup_sec * MSEC_PER_SEC; |
| 432 | info->short_wakeup_ms = short_wakeup_ms; |
| 433 | } |
| 434 | |
| 435 | return 0; |
| 436 | } |
| 437 | |
| 438 | static int nx30p6093_trigger_detect(struct seq_file *file, void *data) |
| 439 | { |
| 440 | struct nx30p6093_info *info = file->private; |
| 441 | |
| 442 | if (info->always_on) |
| 443 | return 0; |
| 444 | |
| 445 | mutex_lock(&info->lock); |
| 446 | nx30p6093_trigger_impedance_detect(info); |
| 447 | seq_printf(file, "%s impedance detected\n", |
| 448 | info->high_impedance ? "BAD" : "GOOD"); |
| 449 | mutex_unlock(&info->lock); |
| 450 | |
| 451 | return 0; |
| 452 | } |
| 453 | |
| 454 | static int nx30p6093_trigger_detect_open(struct inode *inode, struct file *file) |
| 455 | { |
| 456 | return single_open(file, nx30p6093_trigger_detect, inode->i_private); |
| 457 | } |
| 458 | |
| 459 | static const struct file_operations nx30p6093_trigger_detect_fops = { |
| 460 | .owner = THIS_MODULE, |
| 461 | .open = nx30p6093_trigger_detect_open, |
| 462 | .read = seq_read, |
| 463 | .llseek = seq_lseek, |
| 464 | .release = single_release, |
| 465 | }; |
| 466 | |
| 467 | static void nx30p6093_debugfs_init(struct nx30p6093_info *info) |
| 468 | { |
| 469 | struct dentry *temp; |
| 470 | |
| 471 | /* debugfs */ |
| 472 | info->debugfs = debugfs_create_dir("nx30p6093", NULL); |
| 473 | if (!info->debugfs) { |
| 474 | pr_err("Couldn't create debug dir\n"); |
| 475 | return; |
| 476 | } |
| 477 | |
| 478 | temp = debugfs_create_file("trigger_detection", 0644, info->debugfs, |
| 479 | info, &nx30p6093_trigger_detect_fops); |
| 480 | if (IS_ERR_OR_NULL(temp)) { |
| 481 | pr_err("debugfs_nx30p6093_reg_addr_fops debugfs file creation failed\n"); |
| 482 | debugfs_remove_recursive(info->debugfs); |
| 483 | } |
| 484 | } |
| 485 | |
| 486 | #if CONFIG_PM |
| 487 | static int nx30p6093_suspend(struct device *dev) |
| 488 | { |
| 489 | struct i2c_client *client = to_i2c_client(dev); |
| 490 | struct nx30p6093_info *info = i2c_get_clientdata(client); |
| 491 | |
| 492 | cancel_delayed_work_sync(&info->config_impedance_detect); |
| 493 | |
| 494 | mutex_lock(&info->lock); |
| 495 | info->suspended = true; |
| 496 | mutex_unlock(&info->lock); |
| 497 | |
| 498 | return 0; |
| 499 | } |
| 500 | |
| 501 | static int nx30p6093_suspend_noirq(struct device *dev) |
| 502 | { |
| 503 | struct i2c_client *client = to_i2c_client(dev); |
| 504 | struct nx30p6093_info *info = i2c_get_clientdata(client); |
| 505 | |
| 506 | if (info->irq_waiting) { |
| 507 | pr_err_ratelimited("Aborting suspend, an interrupt was detected while suspending\n"); |
| 508 | return -EBUSY; |
| 509 | } |
| 510 | return 0; |
| 511 | } |
| 512 | |
| 513 | static int nx30p6093_resume(struct device *dev) |
| 514 | { |
| 515 | struct i2c_client *client = to_i2c_client(dev); |
| 516 | struct nx30p6093_info *info = i2c_get_clientdata(client); |
| 517 | |
| 518 | mutex_lock(&info->lock); |
| 519 | info->suspended = false; |
| 520 | if (info->irq_waiting) { |
| 521 | mutex_unlock(&info->lock); |
| 522 | nx30p6093_irq_handler(client->irq, info); |
| 523 | enable_irq(client->irq); |
| 524 | } else { |
| 525 | mutex_unlock(&info->lock); |
| 526 | } |
| 527 | |
| 528 | return 0; |
| 529 | } |
| 530 | #else |
| 531 | static int nx30p6093_suspend(struct device *dev) |
| 532 | { |
| 533 | return 0; |
| 534 | } |
| 535 | |
| 536 | static int nx30p6093_resume(struct device *dev) |
| 537 | { |
| 538 | return 0; |
| 539 | } |
| 540 | #endif |
| 541 | |
| 542 | static const struct dev_pm_ops nx30p6093_pm_ops = { |
| 543 | .suspend = nx30p6093_suspend, |
| 544 | .suspend_noirq = nx30p6093_suspend_noirq, |
| 545 | .resume = nx30p6093_resume, |
| 546 | }; |
| 547 | |
| 548 | static int nx30p6093_probe(struct i2c_client *client, |
| 549 | const struct i2c_device_id *id) |
| 550 | { |
| 551 | struct nx30p6093_info *info; |
| 552 | unsigned int val; |
| 553 | int vendor_id, version_id, rc = 0; |
| 554 | |
| 555 | info = devm_kzalloc(&client->dev, sizeof(*info), GFP_KERNEL); |
| 556 | if (!info) |
| 557 | return -ENOMEM; |
| 558 | |
| 559 | info->dev = &client->dev; |
| 560 | info->regmap = devm_regmap_init_i2c(client, &nx30p6093_regmap_config); |
| 561 | if (IS_ERR(info->regmap)) { |
| 562 | pr_err("Error in allocating regmap, rc=%ld\n", |
| 563 | PTR_ERR(info->regmap)); |
| 564 | return PTR_ERR(info->regmap); |
| 565 | } |
| 566 | |
| 567 | rc = regmap_read(info->regmap, NX30P6093_ID_REG, &val); |
| 568 | if (rc < 0) { |
| 569 | pr_err("Unable to identify NX30P6093, rc=%d\n", rc); |
| 570 | return rc; |
| 571 | } |
| 572 | vendor_id = (val & NX30P6093_VENDOR_ID_MASK) |
| 573 | >> NX30P6093_VENDOR_ID_SHIFT; |
| 574 | version_id = val & NX30P6093_VERSION_ID_MASK; |
| 575 | |
| 576 | info->usb_psy = power_supply_get_by_name("usb"); |
| 577 | if (!info->usb_psy) { |
| 578 | pr_err("USB psy not found\n"); |
| 579 | return -EPROBE_DEFER; |
| 580 | } |
| 581 | |
| 582 | i2c_set_clientdata(client, info); |
| 583 | mutex_init(&info->lock); |
| 584 | INIT_DELAYED_WORK(&info->config_impedance_detect, |
| 585 | nx30p6093_config_impedance_detect); |
| 586 | |
| 587 | rc = nx30p6093_dt_init(client, info); |
| 588 | if (rc < 0) { |
| 589 | pr_err("device tree parsing failed, rc=%d\n", rc); |
| 590 | return rc; |
| 591 | } |
| 592 | |
| 593 | rc = nx30p6093_init_config(info); |
| 594 | if (rc < 0) { |
| 595 | pr_err("initial configuration programming failed, rc=%d\n", rc); |
| 596 | return rc; |
| 597 | } |
| 598 | |
| 599 | if (alarmtimer_get_rtcdev()) { |
| 600 | /* Initialize alarm timer */ |
| 601 | info->use_alarm = true; |
| 602 | alarm_init(&info->alarm_timer, ALARM_BOOTTIME, |
| 603 | nx30p6093_process_alarm_event); |
| 604 | } else { |
| 605 | pr_err("alarm initialization failed\n"); |
| 606 | return -ENODEV; |
| 607 | } |
| 608 | |
| 609 | if (info->always_on) { |
| 610 | /* Moisture detect irq configuration */ |
| 611 | if (client->irq) { |
| 612 | info->irq = client->irq; |
| 613 | rc = devm_request_threaded_irq(&client->dev, |
| 614 | client->irq, NULL, |
| 615 | nx30p6093_irq_handler, |
| 616 | IRQF_ONESHOT | IRQF_TRIGGER_FALLING, |
| 617 | client->name, info); |
| 618 | if (rc < 0) { |
| 619 | pr_err("Failed Moisture detect irq(%d) request, rc=%d\n", |
| 620 | client->irq, rc); |
| 621 | return rc; |
| 622 | } |
| 623 | enable_irq_wake(client->irq); |
| 624 | } else { |
| 625 | pr_err("Moisture detect irq not defined\n"); |
| 626 | return -EINVAL; |
| 627 | } |
| 628 | |
| 629 | nx30p6093_impedance_detect(info, true); |
| 630 | } else { |
| 631 | /* Run impedance detection for first time */ |
| 632 | pm_stay_awake(info->dev); |
| 633 | schedule_delayed_work(&info->config_impedance_detect, 0); |
| 634 | } |
| 635 | |
| 636 | nx30p6093_debugfs_init(info); |
| 637 | |
| 638 | if (info->always_on) |
| 639 | pr_info("NXP NX30P6093 Vendor(%d), Version(%d), configured to Always-on detection\n", |
| 640 | vendor_id, version_id); |
| 641 | else |
| 642 | pr_info("NXP NX30P6093 Vendor(%d), Version(%d), configured to periodic detection with Short_wakeup = %llu ms and Long_wakeup = %llu sec\n", |
| 643 | vendor_id, version_id, info->short_wakeup_ms, |
| 644 | info->long_wakeup_ms / MSEC_PER_SEC); |
| 645 | |
| 646 | return 0; |
| 647 | } |
| 648 | |
| 649 | static int nx30p6093_remove(struct i2c_client *client) |
| 650 | { |
| 651 | struct nx30p6093_info *info = i2c_get_clientdata(client); |
| 652 | |
| 653 | debugfs_remove_recursive(info->debugfs); |
| 654 | cancel_delayed_work_sync(&info->config_impedance_detect); |
| 655 | |
| 656 | if (info->use_alarm) |
| 657 | alarm_cancel(&info->alarm_timer); |
| 658 | |
| 659 | return 0; |
| 660 | } |
| 661 | |
| 662 | static const struct of_device_id nx30p6093_table[] = { |
| 663 | { .compatible = "nxp,nx30p6093" }, |
| 664 | { }, |
| 665 | }; |
| 666 | MODULE_DEVICE_TABLE(of, nx30p6093_table); |
| 667 | |
| 668 | static const struct i2c_device_id nx30p6093_id[] = { |
| 669 | {"nx30p6093", -1}, |
| 670 | { }, |
| 671 | }; |
| 672 | MODULE_DEVICE_TABLE(i2c, nx30p6093_id); |
| 673 | |
| 674 | static struct i2c_driver nx30p6093_driver = { |
| 675 | .driver = { |
| 676 | .name = "nxp,nx30p6093", |
| 677 | .owner = THIS_MODULE, |
| 678 | .of_match_table = nx30p6093_table, |
| 679 | .pm = &nx30p6093_pm_ops, |
| 680 | }, |
| 681 | .probe = nx30p6093_probe, |
| 682 | .remove = nx30p6093_remove, |
| 683 | .id_table = nx30p6093_id, |
| 684 | }; |
| 685 | module_i2c_driver(nx30p6093_driver); |
| 686 | |
| 687 | MODULE_DESCRIPTION("NX30P6093 driver"); |
| 688 | MODULE_LICENSE("GPL v2"); |