drivers/phy/motorola/phy-mapphone-mdm6600.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Motorola Mapphone MDM6600 modem GPIO controlled USB PHY driver
   4  * Copyright (C) 2018 Tony Lindgren <tony@atomide.com>
   5  */
   6
   7 #include <linux/delay.h>
   8 #include <linux/err.h>
   9 #include <linux/io.h>
  10 #include <linux/interrupt.h>
  11 #include <linux/module.h>
  12 #include <linux/of.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/slab.h>
  15
  16 #include <linux/gpio/consumer.h>
  17 #include <linux/of_platform.h>
  18 #include <linux/phy/phy.h>
  19
  20 #define PHY_MDM6600_PHY_DELAY_MS        4000    /* PHY enable 2.2s to 3.5s */
  21 #define PHY_MDM6600_ENABLED_DELAY_MS    8000    /* 8s more total for MDM6600 */
  22 #define MDM6600_MODEM_IDLE_DELAY_MS     1000    /* modem after USB suspend */
  23 #define MDM6600_MODEM_WAKE_DELAY_MS     200     /* modem response after idle */
  24
  25 enum phy_mdm6600_ctrl_lines {
  26         PHY_MDM6600_ENABLE,                     /* USB PHY enable */
  27         PHY_MDM6600_POWER,                      /* Device power */
  28         PHY_MDM6600_RESET,                      /* Device reset */
  29         PHY_MDM6600_NR_CTRL_LINES,
  30 };
  31
  32 enum phy_mdm6600_bootmode_lines {
  33         PHY_MDM6600_MODE0,                      /* out USB mode0 and OOB wake */
  34         PHY_MDM6600_MODE1,                      /* out USB mode1, in OOB wake */
  35         PHY_MDM6600_NR_MODE_LINES,
  36 };
  37
  38 enum phy_mdm6600_cmd_lines {
  39         PHY_MDM6600_CMD0,
  40         PHY_MDM6600_CMD1,
  41         PHY_MDM6600_CMD2,
  42         PHY_MDM6600_NR_CMD_LINES,
  43 };
  44
  45 enum phy_mdm6600_status_lines {
  46         PHY_MDM6600_STATUS0,
  47         PHY_MDM6600_STATUS1,
  48         PHY_MDM6600_STATUS2,
  49         PHY_MDM6600_NR_STATUS_LINES,
  50 };
  51
  52 /*
  53  * MDM6600 command codes. These are based on Motorola Mapphone Linux
  54  * kernel tree.
  55  */
  56 enum phy_mdm6600_cmd {
  57         PHY_MDM6600_CMD_BP_PANIC_ACK,
  58         PHY_MDM6600_CMD_DATA_ONLY_BYPASS,       /* Reroute USB to CPCAP PHY */
  59         PHY_MDM6600_CMD_FULL_BYPASS,            /* Reroute USB to CPCAP PHY */
  60         PHY_MDM6600_CMD_NO_BYPASS,              /* Request normal USB mode */
  61         PHY_MDM6600_CMD_BP_SHUTDOWN_REQ,        /* Request device power off */
  62         PHY_MDM6600_CMD_BP_UNKNOWN_5,
  63         PHY_MDM6600_CMD_BP_UNKNOWN_6,
  64         PHY_MDM6600_CMD_UNDEFINED,
  65 };
  66
  67 /*
  68  * MDM6600 status codes. These are based on Motorola Mapphone Linux
  69  * kernel tree.
  70  */
  71 enum phy_mdm6600_status {
  72         PHY_MDM6600_STATUS_PANIC,               /* Seems to be really off */
  73         PHY_MDM6600_STATUS_PANIC_BUSY_WAIT,
  74         PHY_MDM6600_STATUS_QC_DLOAD,
  75         PHY_MDM6600_STATUS_RAM_DOWNLOADER,      /* MDM6600 USB flashing mode */
  76         PHY_MDM6600_STATUS_PHONE_CODE_AWAKE,    /* MDM6600 normal USB mode */
  77         PHY_MDM6600_STATUS_PHONE_CODE_ASLEEP,
  78         PHY_MDM6600_STATUS_SHUTDOWN_ACK,
  79         PHY_MDM6600_STATUS_UNDEFINED,
  80 };
  81
  82 static const char * const
  83 phy_mdm6600_status_name[] = {
  84         "off", "busy", "qc_dl", "ram_dl", "awake",
  85         "asleep", "shutdown", "undefined",
  86 };
  87
  88 struct phy_mdm6600 {
  89         struct device *dev;
  90         struct phy *generic_phy;
  91         struct phy_provider *phy_provider;
  92         struct gpio_desc *ctrl_gpios[PHY_MDM6600_NR_CTRL_LINES];
  93         struct gpio_descs *mode_gpios;
  94         struct gpio_descs *status_gpios;
  95         struct gpio_descs *cmd_gpios;
  96         struct delayed_work bootup_work;
  97         struct delayed_work status_work;
  98         struct delayed_work modem_wake_work;
  99         struct completion ack;
 100         bool enabled;                           /* mdm6600 phy enabled */
 101         bool running;                           /* mdm6600 boot done */
 102         bool awake;                             /* mdm6600 respnds on n_gsm */
 103         int status;
 104 };
 105
 106 static int phy_mdm6600_init(struct phy *x)
 107 {
 108         struct phy_mdm6600 *ddata = phy_get_drvdata(x);
 109         struct gpio_desc *enable_gpio = ddata->ctrl_gpios[PHY_MDM6600_ENABLE];
 110
 111         if (!ddata->enabled)
 112                 return -EPROBE_DEFER;
 113
 114         gpiod_set_value_cansleep(enable_gpio, 0);
 115
 116         return 0;
 117 }
 118
 119 static int phy_mdm6600_power_on(struct phy *x)
 120 {
 121         struct phy_mdm6600 *ddata = phy_get_drvdata(x);
 122         struct gpio_desc *enable_gpio = ddata->ctrl_gpios[PHY_MDM6600_ENABLE];
 123
 124         if (!ddata->enabled)
 125                 return -ENODEV;
 126
 127         gpiod_set_value_cansleep(enable_gpio, 1);
 128
 129         return 0;
 130 }
 131
 132 static int phy_mdm6600_power_off(struct phy *x)
 133 {
 134         struct phy_mdm6600 *ddata = phy_get_drvdata(x);
 135         struct gpio_desc *enable_gpio = ddata->ctrl_gpios[PHY_MDM6600_ENABLE];
 136
 137         if (!ddata->enabled)
 138                 return -ENODEV;
 139
 140         gpiod_set_value_cansleep(enable_gpio, 0);
 141
 142         return 0;
 143 }
 144
 145 static const struct phy_ops gpio_usb_ops = {
 146         .init = phy_mdm6600_init,
 147         .power_on = phy_mdm6600_power_on,
 148         .power_off = phy_mdm6600_power_off,
 149         .owner = THIS_MODULE,
 150 };
 151
 152 /**
 153  * phy_mdm6600_cmd() - send a command request to mdm6600
 154  * @ddata: device driver data
 155  *
 156  * Configures the three command request GPIOs to the specified value.
 157  */
 158 static void phy_mdm6600_cmd(struct phy_mdm6600 *ddata, int val)
 159 {
 160         DECLARE_BITMAP(values, PHY_MDM6600_NR_CMD_LINES);
 161
 162         values[0] = val;
 163
 164         gpiod_set_array_value_cansleep(PHY_MDM6600_NR_CMD_LINES,
 165                                        ddata->cmd_gpios->desc,
 166                                        ddata->cmd_gpios->info, values);
 167 }
 168
 169 /**
 170  * phy_mdm6600_status() - read mdm6600 status lines
 171  * @ddata: device driver data
 172  */
 173 static void phy_mdm6600_status(struct work_struct *work)
 174 {
 175         struct phy_mdm6600 *ddata;
 176         struct device *dev;
 177         DECLARE_BITMAP(values, PHY_MDM6600_NR_STATUS_LINES);
 178         int error, i, val = 0;
 179
 180         ddata = container_of(work, struct phy_mdm6600, status_work.work);
 181         dev = ddata->dev;
 182
 183         error = gpiod_get_array_value_cansleep(PHY_MDM6600_NR_STATUS_LINES,
 184                                                ddata->status_gpios->desc,
 185                                                ddata->status_gpios->info,
 186                                                values);
 187         if (error)
 188                 return;
 189
 190         for (i = 0; i < PHY_MDM6600_NR_STATUS_LINES; i++) {
 191                 val |= test_bit(i, values) << i;
 192                 dev_dbg(ddata->dev, "XXX %s: i: %i values[i]: %i val: %i\n",
 193                         __func__, i, test_bit(i, values), val);
 194         }
 195         ddata->status = values[0];
 196
 197         dev_info(dev, "modem status: %i %s\n",
 198                  ddata->status,
 199                  phy_mdm6600_status_name[ddata->status & 7]);
 200         complete(&ddata->ack);
 201 }
 202
 203 static irqreturn_t phy_mdm6600_irq_thread(int irq, void *data)
 204 {
 205         struct phy_mdm6600 *ddata = data;
 206
 207         schedule_delayed_work(&ddata->status_work, msecs_to_jiffies(10));
 208
 209         return IRQ_HANDLED;
 210 }
 211
 212 /**
 213  * phy_mdm6600_wakeirq_thread - handle mode1 line OOB wake after booting
 214  * @irq: interrupt
 215  * @data: interrupt handler data
 216  *
 217  * GPIO mode1 is used initially as output to configure the USB boot
 218  * mode for mdm6600. After booting it is used as input for OOB wake
 219  * signal from mdm6600 to the SoC. Just use it for debug info only
 220  * for now.
 221  */
 222 static irqreturn_t phy_mdm6600_wakeirq_thread(int irq, void *data)
 223 {
 224         struct phy_mdm6600 *ddata = data;
 225         struct gpio_desc *mode_gpio1;
 226
 227         mode_gpio1 = ddata->mode_gpios->desc[PHY_MDM6600_MODE1];
 228         dev_dbg(ddata->dev, "OOB wake on mode_gpio1: %i\n",
 229                 gpiod_get_value(mode_gpio1));
 230
 231         return IRQ_HANDLED;
 232 }
 233
 234 /**
 235  * phy_mdm6600_init_irq() - initialize mdm6600 status IRQ lines
 236  * @ddata: device driver data
 237  */
 238 static void phy_mdm6600_init_irq(struct phy_mdm6600 *ddata)
 239 {
 240         struct device *dev = ddata->dev;
 241         int i, error, irq;
 242
 243         for (i = PHY_MDM6600_STATUS0;
 244              i <= PHY_MDM6600_STATUS2; i++) {
 245                 struct gpio_desc *gpio = ddata->status_gpios->desc[i];
 246
 247                 irq = gpiod_to_irq(gpio);
 248                 if (irq <= 0)
 249                         continue;
 250
 251                 error = devm_request_threaded_irq(dev, irq, NULL,
 252                                         phy_mdm6600_irq_thread,
 253                                         IRQF_TRIGGER_RISING |
 254                                         IRQF_TRIGGER_FALLING |
 255                                         IRQF_ONESHOT,
 256                                         "mdm6600",
 257                                         ddata);
 258                 if (error)
 259                         dev_warn(dev, "no modem status irq%i: %i\n",
 260                                  irq, error);
 261         }
 262 }
 263
 264 struct phy_mdm6600_map {
 265         const char *name;
 266         int direction;
 267 };
 268
 269 static const struct phy_mdm6600_map
 270 phy_mdm6600_ctrl_gpio_map[PHY_MDM6600_NR_CTRL_LINES] = {
 271         { "enable", GPIOD_OUT_LOW, },           /* low = phy disabled */
 272         { "power", GPIOD_OUT_LOW, },            /* low = off */
 273         { "reset", GPIOD_OUT_HIGH, },           /* high = reset */
 274 };
 275
 276 /**
 277  * phy_mdm6600_init_lines() - initialize mdm6600 GPIO lines
 278  * @ddata: device driver data
 279  */
 280 static int phy_mdm6600_init_lines(struct phy_mdm6600 *ddata)
 281 {
 282         struct device *dev = ddata->dev;
 283         int i;
 284
 285         /* MDM6600 control lines */
 286         for (i = 0; i < ARRAY_SIZE(phy_mdm6600_ctrl_gpio_map); i++) {
 287                 const struct phy_mdm6600_map *map =
 288                         &phy_mdm6600_ctrl_gpio_map[i];
 289                 struct gpio_desc **gpio = &ddata->ctrl_gpios[i];
 290
 291                 *gpio = devm_gpiod_get(dev, map->name, map->direction);
 292                 if (IS_ERR(*gpio)) {
 293                         dev_info(dev, "gpio %s error %li\n",
 294                                  map->name, PTR_ERR(*gpio));
 295                         return PTR_ERR(*gpio);
 296                 }
 297         }
 298
 299         /* MDM6600 USB start-up mode output lines */
 300         ddata->mode_gpios = devm_gpiod_get_array(dev, "motorola,mode",
 301                                                  GPIOD_OUT_LOW);
 302         if (IS_ERR(ddata->mode_gpios))
 303                 return PTR_ERR(ddata->mode_gpios);
 304
 305         if (ddata->mode_gpios->ndescs != PHY_MDM6600_NR_MODE_LINES)
 306                 return -EINVAL;
 307
 308         /* MDM6600 status input lines */
 309         ddata->status_gpios = devm_gpiod_get_array(dev, "motorola,status",
 310                                                    GPIOD_IN);
 311         if (IS_ERR(ddata->status_gpios))
 312                 return PTR_ERR(ddata->status_gpios);
 313
 314         if (ddata->status_gpios->ndescs != PHY_MDM6600_NR_STATUS_LINES)
 315                 return -EINVAL;
 316
 317         /* MDM6600 cmd output lines */
 318         ddata->cmd_gpios = devm_gpiod_get_array(dev, "motorola,cmd",
 319                                                 GPIOD_OUT_LOW);
 320         if (IS_ERR(ddata->cmd_gpios))
 321                 return PTR_ERR(ddata->cmd_gpios);
 322
 323         if (ddata->cmd_gpios->ndescs != PHY_MDM6600_NR_CMD_LINES)
 324                 return -EINVAL;
 325
 326         return 0;
 327 }
 328
 329 /**
 330  * phy_mdm6600_device_power_on() - power on mdm6600 device
 331  * @ddata: device driver data
 332  *
 333  * To get the integrated USB phy in MDM6600 takes some hoops. We must ensure
 334  * the shared USB bootmode GPIOs are configured, then request modem start-up,
 335  * reset and power-up.. And then we need to recycle the shared USB bootmode
 336  * GPIOs as they are also used for Out of Band (OOB) wake for the USB and
 337  * TS 27.010 serial mux.
 338  */
 339 static int phy_mdm6600_device_power_on(struct phy_mdm6600 *ddata)
 340 {
 341         struct gpio_desc *mode_gpio0, *mode_gpio1, *reset_gpio, *power_gpio;
 342         int error = 0, wakeirq;
 343
 344         mode_gpio0 = ddata->mode_gpios->desc[PHY_MDM6600_MODE0];
 345         mode_gpio1 = ddata->mode_gpios->desc[PHY_MDM6600_MODE1];
 346         reset_gpio = ddata->ctrl_gpios[PHY_MDM6600_RESET];
 347         power_gpio = ddata->ctrl_gpios[PHY_MDM6600_POWER];
 348
 349         /*
 350          * Shared GPIOs must be low for normal USB mode. After booting
 351          * they are used for OOB wake signaling. These can be also used
 352          * to configure USB flashing mode later on based on a module
 353          * parameter.
 354          */
 355         gpiod_set_value_cansleep(mode_gpio0, 0);
 356         gpiod_set_value_cansleep(mode_gpio1, 0);
 357
 358         /* Request start-up mode */
 359         phy_mdm6600_cmd(ddata, PHY_MDM6600_CMD_NO_BYPASS);
 360
 361         /* Request a reset first */
 362         gpiod_set_value_cansleep(reset_gpio, 0);
 363         msleep(100);
 364
 365         /* Toggle power GPIO to request mdm6600 to start */
 366         gpiod_set_value_cansleep(power_gpio, 1);
 367         msleep(100);
 368         gpiod_set_value_cansleep(power_gpio, 0);
 369
 370         /*
 371          * Looks like the USB PHY needs between 2.2 to 4 seconds.
 372          * If we try to use it before that, we will get L3 errors
 373          * from omap-usb-host trying to access the PHY. See also
 374          * phy_mdm6600_init() for -EPROBE_DEFER.
 375          */
 376         msleep(PHY_MDM6600_PHY_DELAY_MS);
 377         ddata->enabled = true;
 378
 379         /* Booting up the rest of MDM6600 will take total about 8 seconds */
 380         dev_info(ddata->dev, "Waiting for power up request to complete..\n");
 381         if (wait_for_completion_timeout(&ddata->ack,
 382                         msecs_to_jiffies(PHY_MDM6600_ENABLED_DELAY_MS))) {
 383                 if (ddata->status > PHY_MDM6600_STATUS_PANIC &&
 384                     ddata->status < PHY_MDM6600_STATUS_SHUTDOWN_ACK)
 385                         dev_info(ddata->dev, "Powered up OK\n");
 386         } else {
 387                 ddata->enabled = false;
 388                 error = -ETIMEDOUT;
 389                 dev_err(ddata->dev, "Timed out powering up\n");
 390         }
 391
 392         /* Reconfigure mode1 GPIO as input for OOB wake */
 393         gpiod_direction_input(mode_gpio1);
 394
 395         wakeirq = gpiod_to_irq(mode_gpio1);
 396         if (wakeirq <= 0)
 397                 return wakeirq;
 398
 399         error = devm_request_threaded_irq(ddata->dev, wakeirq, NULL,
 400                                           phy_mdm6600_wakeirq_thread,
 401                                           IRQF_TRIGGER_RISING |
 402                                           IRQF_TRIGGER_FALLING |
 403                                           IRQF_ONESHOT,
 404                                           "mdm6600-wake",
 405                                           ddata);
 406         if (error)
 407                 dev_warn(ddata->dev, "no modem wakeirq irq%i: %i\n",
 408                          wakeirq, error);
 409
 410         ddata->running = true;
 411
 412         return error;
 413 }
 414
 415 /**
 416  * phy_mdm6600_device_power_off() - power off mdm6600 device
 417  * @ddata: device driver data
 418  */
 419 static void phy_mdm6600_device_power_off(struct phy_mdm6600 *ddata)
 420 {
 421         struct gpio_desc *reset_gpio =
 422                 ddata->ctrl_gpios[PHY_MDM6600_RESET];
 423
 424         ddata->enabled = false;
 425         phy_mdm6600_cmd(ddata, PHY_MDM6600_CMD_BP_SHUTDOWN_REQ);
 426         msleep(100);
 427
 428         gpiod_set_value_cansleep(reset_gpio, 1);
 429
 430         dev_info(ddata->dev, "Waiting for power down request to complete.. ");
 431         if (wait_for_completion_timeout(&ddata->ack,
 432                                         msecs_to_jiffies(5000))) {
 433                 if (ddata->status == PHY_MDM6600_STATUS_PANIC)
 434                         dev_info(ddata->dev, "Powered down OK\n");
 435         } else {
 436                 dev_err(ddata->dev, "Timed out powering down\n");
 437         }
 438 }
 439
 440 static void phy_mdm6600_deferred_power_on(struct work_struct *work)
 441 {
 442         struct phy_mdm6600 *ddata;
 443         int error;
 444
 445         ddata = container_of(work, struct phy_mdm6600, bootup_work.work);
 446
 447         error = phy_mdm6600_device_power_on(ddata);
 448         if (error)
 449                 dev_err(ddata->dev, "Device not functional\n");
 450 }
 451
 452 /*
 453  * USB suspend puts mdm6600 into low power mode. For any n_gsm using apps,
 454  * we need to keep the modem awake by kicking it's mode0 GPIO. This will
 455  * keep the modem awake for about 1.2 seconds. When no n_gsm apps are using
 456  * the modem, runtime PM auto mode can be enabled so modem can enter low
 457  * power mode.
 458  */
 459 static void phy_mdm6600_wake_modem(struct phy_mdm6600 *ddata)
 460 {
 461         struct gpio_desc *mode_gpio0;
 462
 463         mode_gpio0 = ddata->mode_gpios->desc[PHY_MDM6600_MODE0];
 464         gpiod_set_value_cansleep(mode_gpio0, 1);
 465         usleep_range(5, 15);
 466         gpiod_set_value_cansleep(mode_gpio0, 0);
 467         if (ddata->awake)
 468                 usleep_range(5, 15);
 469         else
 470                 msleep(MDM6600_MODEM_WAKE_DELAY_MS);
 471 }
 472
 473 static void phy_mdm6600_modem_wake(struct work_struct *work)
 474 {
 475         struct phy_mdm6600 *ddata;
 476
 477         ddata = container_of(work, struct phy_mdm6600, modem_wake_work.work);
 478         phy_mdm6600_wake_modem(ddata);
 479         schedule_delayed_work(&ddata->modem_wake_work,
 480                               msecs_to_jiffies(MDM6600_MODEM_IDLE_DELAY_MS));
 481 }
 482
 483 static int __maybe_unused phy_mdm6600_runtime_suspend(struct device *dev)
 484 {
 485         struct phy_mdm6600 *ddata = dev_get_drvdata(dev);
 486
 487         cancel_delayed_work_sync(&ddata->modem_wake_work);
 488         ddata->awake = false;
 489
 490         return 0;
 491 }
 492
 493 static int __maybe_unused phy_mdm6600_runtime_resume(struct device *dev)
 494 {
 495         struct phy_mdm6600 *ddata = dev_get_drvdata(dev);
 496
 497         phy_mdm6600_modem_wake(&ddata->modem_wake_work.work);
 498         ddata->awake = true;
 499
 500         return 0;
 501 }
 502
 503 static const struct dev_pm_ops phy_mdm6600_pm_ops = {
 504         SET_RUNTIME_PM_OPS(phy_mdm6600_runtime_suspend,
 505                            phy_mdm6600_runtime_resume, NULL)
 506 };
 507
 508 static const struct of_device_id phy_mdm6600_id_table[] = {
 509         { .compatible = "motorola,mapphone-mdm6600", },
 510         {},
 511 };
 512 MODULE_DEVICE_TABLE(of, phy_mdm6600_id_table);
 513
 514 static int phy_mdm6600_probe(struct platform_device *pdev)
 515 {
 516         struct phy_mdm6600 *ddata;
 517         int error;
 518
 519         ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
 520         if (!ddata)
 521                 return -ENOMEM;
 522
 523         INIT_DELAYED_WORK(&ddata->bootup_work,
 524                           phy_mdm6600_deferred_power_on);
 525         INIT_DELAYED_WORK(&ddata->status_work, phy_mdm6600_status);
 526         INIT_DELAYED_WORK(&ddata->modem_wake_work, phy_mdm6600_modem_wake);
 527         init_completion(&ddata->ack);
 528
 529         ddata->dev = &pdev->dev;
 530         platform_set_drvdata(pdev, ddata);
 531
 532         error = phy_mdm6600_init_lines(ddata);
 533         if (error)
 534                 return error;
 535
 536         phy_mdm6600_init_irq(ddata);
 537
 538         ddata->generic_phy = devm_phy_create(ddata->dev, NULL, &gpio_usb_ops);
 539         if (IS_ERR(ddata->generic_phy)) {
 540                 error = PTR_ERR(ddata->generic_phy);
 541                 goto cleanup;
 542         }
 543
 544         phy_set_drvdata(ddata->generic_phy, ddata);
 545
 546         ddata->phy_provider =
 547                 devm_of_phy_provider_register(ddata->dev,
 548                                               of_phy_simple_xlate);
 549         if (IS_ERR(ddata->phy_provider)) {
 550                 error = PTR_ERR(ddata->phy_provider);
 551                 goto cleanup;
 552         }
 553
 554         schedule_delayed_work(&ddata->bootup_work, 0);
 555
 556         /*
 557          * See phy_mdm6600_device_power_on(). We should be able
 558          * to remove this eventually when ohci-platform can deal
 559          * with -EPROBE_DEFER.
 560          */
 561         msleep(PHY_MDM6600_PHY_DELAY_MS + 500);
 562
 563         /*
 564          * Enable PM runtime only after PHY has been powered up properly.
 565          * It is currently only needed after USB suspends mdm6600 and n_gsm
 566          * needs to access the device. We don't want to do this earlier as
 567          * gpio mode0 pin doubles as mdm6600 wake-up gpio.
 568          */
 569         pm_runtime_use_autosuspend(ddata->dev);
 570         pm_runtime_set_autosuspend_delay(ddata->dev,
 571                                          MDM6600_MODEM_IDLE_DELAY_MS);
 572         pm_runtime_enable(ddata->dev);
 573         error = pm_runtime_get_sync(ddata->dev);
 574         if (error < 0) {
 575                 dev_warn(ddata->dev, "failed to wake modem: %i\n", error);
 576                 pm_runtime_put_noidle(ddata->dev);
 577         }
 578         pm_runtime_mark_last_busy(ddata->dev);
 579         pm_runtime_put_autosuspend(ddata->dev);
 580
 581         return 0;
 582
 583 cleanup:
 584         phy_mdm6600_device_power_off(ddata);
 585         return error;
 586 }
 587
 588 static int phy_mdm6600_remove(struct platform_device *pdev)
 589 {
 590         struct phy_mdm6600 *ddata = platform_get_drvdata(pdev);
 591         struct gpio_desc *reset_gpio = ddata->ctrl_gpios[PHY_MDM6600_RESET];
 592
 593         pm_runtime_dont_use_autosuspend(ddata->dev);
 594         pm_runtime_put_sync(ddata->dev);
 595         pm_runtime_disable(ddata->dev);
 596
 597         if (!ddata->running)
 598                 wait_for_completion_timeout(&ddata->ack,
 599                         msecs_to_jiffies(PHY_MDM6600_ENABLED_DELAY_MS));
 600
 601         gpiod_set_value_cansleep(reset_gpio, 1);
 602         phy_mdm6600_device_power_off(ddata);
 603
 604         cancel_delayed_work_sync(&ddata->modem_wake_work);
 605         cancel_delayed_work_sync(&ddata->bootup_work);
 606         cancel_delayed_work_sync(&ddata->status_work);
 607
 608         return 0;
 609 }
 610
 611 static struct platform_driver phy_mdm6600_driver = {
 612         .probe = phy_mdm6600_probe,
 613         .remove = phy_mdm6600_remove,
 614         .driver = {
 615                 .name = "phy-mapphone-mdm6600",
 616                 .pm = &phy_mdm6600_pm_ops,
 617                 .of_match_table = of_match_ptr(phy_mdm6600_id_table),
 618         },
 619 };
 620
 621 module_platform_driver(phy_mdm6600_driver);
 622
 623 MODULE_ALIAS("platform:gpio_usb");
 624 MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
 625 MODULE_DESCRIPTION("mdm6600 gpio usb phy driver");
 626 MODULE_LICENSE("GPL v2");