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, values);
 166 }
 167
 168 /**
 169  * phy_mdm6600_status() - read mdm6600 status lines
 170  * @ddata: device driver data
 171  */
 172 static void phy_mdm6600_status(struct work_struct *work)
 173 {
 174         struct phy_mdm6600 *ddata;
 175         struct device *dev;
 176         DECLARE_BITMAP(values, PHY_MDM6600_NR_STATUS_LINES);
 177         int error, i, val = 0;
 178
 179         ddata = container_of(work, struct phy_mdm6600, status_work.work);
 180         dev = ddata->dev;
 181
 182         error = gpiod_get_array_value_cansleep(PHY_MDM6600_NR_STATUS_LINES,
 183                                                ddata->status_gpios->desc,
 184                                                values);
 185         if (error)
 186                 return;
 187
 188         for (i = 0; i < PHY_MDM6600_NR_STATUS_LINES; i++) {
 189                 val |= test_bit(i, values) << i;
 190                 dev_dbg(ddata->dev, "XXX %s: i: %i values[i]: %i val: %i\n",
 191                         __func__, i, test_bit(i, values), val);
 192         }
 193         ddata->status = values[0];
 194
 195         dev_info(dev, "modem status: %i %s\n",
 196                  ddata->status,
 197                  phy_mdm6600_status_name[ddata->status & 7]);
 198         complete(&ddata->ack);
 199 }
 200
 201 static irqreturn_t phy_mdm6600_irq_thread(int irq, void *data)
 202 {
 203         struct phy_mdm6600 *ddata = data;
 204
 205         schedule_delayed_work(&ddata->status_work, msecs_to_jiffies(10));
 206
 207         return IRQ_HANDLED;
 208 }
 209
 210 /**
 211  * phy_mdm6600_wakeirq_thread - handle mode1 line OOB wake after booting
 212  * @irq: interrupt
 213  * @data: interrupt handler data
 214  *
 215  * GPIO mode1 is used initially as output to configure the USB boot
 216  * mode for mdm6600. After booting it is used as input for OOB wake
 217  * signal from mdm6600 to the SoC. Just use it for debug info only
 218  * for now.
 219  */
 220 static irqreturn_t phy_mdm6600_wakeirq_thread(int irq, void *data)
 221 {
 222         struct phy_mdm6600 *ddata = data;
 223         struct gpio_desc *mode_gpio1;
 224
 225         mode_gpio1 = ddata->mode_gpios->desc[PHY_MDM6600_MODE1];
 226         dev_dbg(ddata->dev, "OOB wake on mode_gpio1: %i\n",
 227                 gpiod_get_value(mode_gpio1));
 228
 229         return IRQ_HANDLED;
 230 }
 231
 232 /**
 233  * phy_mdm6600_init_irq() - initialize mdm6600 status IRQ lines
 234  * @ddata: device driver data
 235  */
 236 static void phy_mdm6600_init_irq(struct phy_mdm6600 *ddata)
 237 {
 238         struct device *dev = ddata->dev;
 239         int i, error, irq;
 240
 241         for (i = PHY_MDM6600_STATUS0;
 242              i <= PHY_MDM6600_STATUS2; i++) {
 243                 struct gpio_desc *gpio = ddata->status_gpios->desc[i];
 244
 245                 irq = gpiod_to_irq(gpio);
 246                 if (irq <= 0)
 247                         continue;
 248
 249                 error = devm_request_threaded_irq(dev, irq, NULL,
 250                                         phy_mdm6600_irq_thread,
 251                                         IRQF_TRIGGER_RISING |
 252                                         IRQF_TRIGGER_FALLING |
 253                                         IRQF_ONESHOT,
 254                                         "mdm6600",
 255                                         ddata);
 256                 if (error)
 257                         dev_warn(dev, "no modem status irq%i: %i\n",
 258                                  irq, error);
 259         }
 260 }
 261
 262 struct phy_mdm6600_map {
 263         const char *name;
 264         int direction;
 265 };
 266
 267 static const struct phy_mdm6600_map
 268 phy_mdm6600_ctrl_gpio_map[PHY_MDM6600_NR_CTRL_LINES] = {
 269         { "enable", GPIOD_OUT_LOW, },           /* low = phy disabled */
 270         { "power", GPIOD_OUT_LOW, },            /* low = off */
 271         { "reset", GPIOD_OUT_HIGH, },           /* high = reset */
 272 };
 273
 274 /**
 275  * phy_mdm6600_init_lines() - initialize mdm6600 GPIO lines
 276  * @ddata: device driver data
 277  */
 278 static int phy_mdm6600_init_lines(struct phy_mdm6600 *ddata)
 279 {
 280         struct device *dev = ddata->dev;
 281         int i;
 282
 283         /* MDM6600 control lines */
 284         for (i = 0; i < ARRAY_SIZE(phy_mdm6600_ctrl_gpio_map); i++) {
 285                 const struct phy_mdm6600_map *map =
 286                         &phy_mdm6600_ctrl_gpio_map[i];
 287                 struct gpio_desc **gpio = &ddata->ctrl_gpios[i];
 288
 289                 *gpio = devm_gpiod_get(dev, map->name, map->direction);
 290                 if (IS_ERR(*gpio)) {
 291                         dev_info(dev, "gpio %s error %li\n",
 292                                  map->name, PTR_ERR(*gpio));
 293                         return PTR_ERR(*gpio);
 294                 }
 295         }
 296
 297         /* MDM6600 USB start-up mode output lines */
 298         ddata->mode_gpios = devm_gpiod_get_array(dev, "motorola,mode",
 299                                                  GPIOD_OUT_LOW);
 300         if (IS_ERR(ddata->mode_gpios))
 301                 return PTR_ERR(ddata->mode_gpios);
 302
 303         if (ddata->mode_gpios->ndescs != PHY_MDM6600_NR_MODE_LINES)
 304                 return -EINVAL;
 305
 306         /* MDM6600 status input lines */
 307         ddata->status_gpios = devm_gpiod_get_array(dev, "motorola,status",
 308                                                    GPIOD_IN);
 309         if (IS_ERR(ddata->status_gpios))
 310                 return PTR_ERR(ddata->status_gpios);
 311
 312         if (ddata->status_gpios->ndescs != PHY_MDM6600_NR_STATUS_LINES)
 313                 return -EINVAL;
 314
 315         /* MDM6600 cmd output lines */
 316         ddata->cmd_gpios = devm_gpiod_get_array(dev, "motorola,cmd",
 317                                                 GPIOD_OUT_LOW);
 318         if (IS_ERR(ddata->cmd_gpios))
 319                 return PTR_ERR(ddata->cmd_gpios);
 320
 321         if (ddata->cmd_gpios->ndescs != PHY_MDM6600_NR_CMD_LINES)
 322                 return -EINVAL;
 323
 324         return 0;
 325 }
 326
 327 /**
 328  * phy_mdm6600_device_power_on() - power on mdm6600 device
 329  * @ddata: device driver data
 330  *
 331  * To get the integrated USB phy in MDM6600 takes some hoops. We must ensure
 332  * the shared USB bootmode GPIOs are configured, then request modem start-up,
 333  * reset and power-up.. And then we need to recycle the shared USB bootmode
 334  * GPIOs as they are also used for Out of Band (OOB) wake for the USB and
 335  * TS 27.010 serial mux.
 336  */
 337 static int phy_mdm6600_device_power_on(struct phy_mdm6600 *ddata)
 338 {
 339         struct gpio_desc *mode_gpio0, *mode_gpio1, *reset_gpio, *power_gpio;
 340         int error = 0, wakeirq;
 341
 342         mode_gpio0 = ddata->mode_gpios->desc[PHY_MDM6600_MODE0];
 343         mode_gpio1 = ddata->mode_gpios->desc[PHY_MDM6600_MODE1];
 344         reset_gpio = ddata->ctrl_gpios[PHY_MDM6600_RESET];
 345         power_gpio = ddata->ctrl_gpios[PHY_MDM6600_POWER];
 346
 347         /*
 348          * Shared GPIOs must be low for normal USB mode. After booting
 349          * they are used for OOB wake signaling. These can be also used
 350          * to configure USB flashing mode later on based on a module
 351          * parameter.
 352          */
 353         gpiod_set_value_cansleep(mode_gpio0, 0);
 354         gpiod_set_value_cansleep(mode_gpio1, 0);
 355
 356         /* Request start-up mode */
 357         phy_mdm6600_cmd(ddata, PHY_MDM6600_CMD_NO_BYPASS);
 358
 359         /* Request a reset first */
 360         gpiod_set_value_cansleep(reset_gpio, 0);
 361         msleep(100);
 362
 363         /* Toggle power GPIO to request mdm6600 to start */
 364         gpiod_set_value_cansleep(power_gpio, 1);
 365         msleep(100);
 366         gpiod_set_value_cansleep(power_gpio, 0);
 367
 368         /*
 369          * Looks like the USB PHY needs between 2.2 to 4 seconds.
 370          * If we try to use it before that, we will get L3 errors
 371          * from omap-usb-host trying to access the PHY. See also
 372          * phy_mdm6600_init() for -EPROBE_DEFER.
 373          */
 374         msleep(PHY_MDM6600_PHY_DELAY_MS);
 375         ddata->enabled = true;
 376
 377         /* Booting up the rest of MDM6600 will take total about 8 seconds */
 378         dev_info(ddata->dev, "Waiting for power up request to complete..\n");
 379         if (wait_for_completion_timeout(&ddata->ack,
 380                         msecs_to_jiffies(PHY_MDM6600_ENABLED_DELAY_MS))) {
 381                 if (ddata->status > PHY_MDM6600_STATUS_PANIC &&
 382                     ddata->status < PHY_MDM6600_STATUS_SHUTDOWN_ACK)
 383                         dev_info(ddata->dev, "Powered up OK\n");
 384         } else {
 385                 ddata->enabled = false;
 386                 error = -ETIMEDOUT;
 387                 dev_err(ddata->dev, "Timed out powering up\n");
 388         }
 389
 390         /* Reconfigure mode1 GPIO as input for OOB wake */
 391         gpiod_direction_input(mode_gpio1);
 392
 393         wakeirq = gpiod_to_irq(mode_gpio1);
 394         if (wakeirq <= 0)
 395                 return wakeirq;
 396
 397         error = devm_request_threaded_irq(ddata->dev, wakeirq, NULL,
 398                                           phy_mdm6600_wakeirq_thread,
 399                                           IRQF_TRIGGER_RISING |
 400                                           IRQF_TRIGGER_FALLING |
 401                                           IRQF_ONESHOT,
 402                                           "mdm6600-wake",
 403                                           ddata);
 404         if (error)
 405                 dev_warn(ddata->dev, "no modem wakeirq irq%i: %i\n",
 406                          wakeirq, error);
 407
 408         ddata->running = true;
 409
 410         return error;
 411 }
 412
 413 /**
 414  * phy_mdm6600_device_power_off() - power off mdm6600 device
 415  * @ddata: device driver data
 416  */
 417 static void phy_mdm6600_device_power_off(struct phy_mdm6600 *ddata)
 418 {
 419         struct gpio_desc *reset_gpio =
 420                 ddata->ctrl_gpios[PHY_MDM6600_RESET];
 421
 422         ddata->enabled = false;
 423         phy_mdm6600_cmd(ddata, PHY_MDM6600_CMD_BP_SHUTDOWN_REQ);
 424         msleep(100);
 425
 426         gpiod_set_value_cansleep(reset_gpio, 1);
 427
 428         dev_info(ddata->dev, "Waiting for power down request to complete.. ");
 429         if (wait_for_completion_timeout(&ddata->ack,
 430                                         msecs_to_jiffies(5000))) {
 431                 if (ddata->status == PHY_MDM6600_STATUS_PANIC)
 432                         dev_info(ddata->dev, "Powered down OK\n");
 433         } else {
 434                 dev_err(ddata->dev, "Timed out powering down\n");
 435         }
 436 }
 437
 438 static void phy_mdm6600_deferred_power_on(struct work_struct *work)
 439 {
 440         struct phy_mdm6600 *ddata;
 441         int error;
 442
 443         ddata = container_of(work, struct phy_mdm6600, bootup_work.work);
 444
 445         error = phy_mdm6600_device_power_on(ddata);
 446         if (error)
 447                 dev_err(ddata->dev, "Device not functional\n");
 448 }
 449
 450 /*
 451  * USB suspend puts mdm6600 into low power mode. For any n_gsm using apps,
 452  * we need to keep the modem awake by kicking it's mode0 GPIO. This will
 453  * keep the modem awake for about 1.2 seconds. When no n_gsm apps are using
 454  * the modem, runtime PM auto mode can be enabled so modem can enter low
 455  * power mode.
 456  */
 457 static void phy_mdm6600_wake_modem(struct phy_mdm6600 *ddata)
 458 {
 459         struct gpio_desc *mode_gpio0;
 460
 461         mode_gpio0 = ddata->mode_gpios->desc[PHY_MDM6600_MODE0];
 462         gpiod_set_value_cansleep(mode_gpio0, 1);
 463         usleep_range(5, 15);
 464         gpiod_set_value_cansleep(mode_gpio0, 0);
 465         if (ddata->awake)
 466                 usleep_range(5, 15);
 467         else
 468                 msleep(MDM6600_MODEM_WAKE_DELAY_MS);
 469 }
 470
 471 static void phy_mdm6600_modem_wake(struct work_struct *work)
 472 {
 473         struct phy_mdm6600 *ddata;
 474
 475         ddata = container_of(work, struct phy_mdm6600, modem_wake_work.work);
 476         phy_mdm6600_wake_modem(ddata);
 477         schedule_delayed_work(&ddata->modem_wake_work,
 478                               msecs_to_jiffies(MDM6600_MODEM_IDLE_DELAY_MS));
 479 }
 480
 481 static int __maybe_unused phy_mdm6600_runtime_suspend(struct device *dev)
 482 {
 483         struct phy_mdm6600 *ddata = dev_get_drvdata(dev);
 484
 485         cancel_delayed_work_sync(&ddata->modem_wake_work);
 486         ddata->awake = false;
 487
 488         return 0;
 489 }
 490
 491 static int __maybe_unused phy_mdm6600_runtime_resume(struct device *dev)
 492 {
 493         struct phy_mdm6600 *ddata = dev_get_drvdata(dev);
 494
 495         phy_mdm6600_modem_wake(&ddata->modem_wake_work.work);
 496         ddata->awake = true;
 497
 498         return 0;
 499 }
 500
 501 static const struct dev_pm_ops phy_mdm6600_pm_ops = {
 502         SET_RUNTIME_PM_OPS(phy_mdm6600_runtime_suspend,
 503                            phy_mdm6600_runtime_resume, NULL)
 504 };
 505
 506 static const struct of_device_id phy_mdm6600_id_table[] = {
 507         { .compatible = "motorola,mapphone-mdm6600", },
 508         {},
 509 };
 510 MODULE_DEVICE_TABLE(of, phy_mdm6600_id_table);
 511
 512 static int phy_mdm6600_probe(struct platform_device *pdev)
 513 {
 514         struct phy_mdm6600 *ddata;
 515         int error;
 516
 517         ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
 518         if (!ddata)
 519                 return -ENOMEM;
 520
 521         INIT_DELAYED_WORK(&ddata->bootup_work,
 522                           phy_mdm6600_deferred_power_on);
 523         INIT_DELAYED_WORK(&ddata->status_work, phy_mdm6600_status);
 524         INIT_DELAYED_WORK(&ddata->modem_wake_work, phy_mdm6600_modem_wake);
 525         init_completion(&ddata->ack);
 526
 527         ddata->dev = &pdev->dev;
 528         platform_set_drvdata(pdev, ddata);
 529
 530         error = phy_mdm6600_init_lines(ddata);
 531         if (error)
 532                 return error;
 533
 534         phy_mdm6600_init_irq(ddata);
 535
 536         ddata->generic_phy = devm_phy_create(ddata->dev, NULL, &gpio_usb_ops);
 537         if (IS_ERR(ddata->generic_phy)) {
 538                 error = PTR_ERR(ddata->generic_phy);
 539                 goto cleanup;
 540         }
 541
 542         phy_set_drvdata(ddata->generic_phy, ddata);
 543
 544         ddata->phy_provider =
 545                 devm_of_phy_provider_register(ddata->dev,
 546                                               of_phy_simple_xlate);
 547         if (IS_ERR(ddata->phy_provider)) {
 548                 error = PTR_ERR(ddata->phy_provider);
 549                 goto cleanup;
 550         }
 551
 552         schedule_delayed_work(&ddata->bootup_work, 0);
 553
 554         /*
 555          * See phy_mdm6600_device_power_on(). We should be able
 556          * to remove this eventually when ohci-platform can deal
 557          * with -EPROBE_DEFER.
 558          */
 559         msleep(PHY_MDM6600_PHY_DELAY_MS + 500);
 560
 561         /*
 562          * Enable PM runtime only after PHY has been powered up properly.
 563          * It is currently only needed after USB suspends mdm6600 and n_gsm
 564          * needs to access the device. We don't want to do this earlier as
 565          * gpio mode0 pin doubles as mdm6600 wake-up gpio.
 566          */
 567         pm_runtime_use_autosuspend(ddata->dev);
 568         pm_runtime_set_autosuspend_delay(ddata->dev,
 569                                          MDM6600_MODEM_IDLE_DELAY_MS);
 570         pm_runtime_enable(ddata->dev);
 571         error = pm_runtime_get_sync(ddata->dev);
 572         if (error < 0) {
 573                 dev_warn(ddata->dev, "failed to wake modem: %i\n", error);
 574                 pm_runtime_put_noidle(ddata->dev);
 575         }
 576         pm_runtime_mark_last_busy(ddata->dev);
 577         pm_runtime_put_autosuspend(ddata->dev);
 578
 579         return 0;
 580
 581 cleanup:
 582         phy_mdm6600_device_power_off(ddata);
 583         return error;
 584 }
 585
 586 static int phy_mdm6600_remove(struct platform_device *pdev)
 587 {
 588         struct phy_mdm6600 *ddata = platform_get_drvdata(pdev);
 589         struct gpio_desc *reset_gpio = ddata->ctrl_gpios[PHY_MDM6600_RESET];
 590
 591         pm_runtime_dont_use_autosuspend(ddata->dev);
 592         pm_runtime_put_sync(ddata->dev);
 593         pm_runtime_disable(ddata->dev);
 594
 595         if (!ddata->running)
 596                 wait_for_completion_timeout(&ddata->ack,
 597                         msecs_to_jiffies(PHY_MDM6600_ENABLED_DELAY_MS));
 598
 599         gpiod_set_value_cansleep(reset_gpio, 1);
 600         phy_mdm6600_device_power_off(ddata);
 601
 602         cancel_delayed_work_sync(&ddata->modem_wake_work);
 603         cancel_delayed_work_sync(&ddata->bootup_work);
 604         cancel_delayed_work_sync(&ddata->status_work);
 605
 606         return 0;
 607 }
 608
 609 static struct platform_driver phy_mdm6600_driver = {
 610         .probe = phy_mdm6600_probe,
 611         .remove = phy_mdm6600_remove,
 612         .driver = {
 613                 .name = "phy-mapphone-mdm6600",
 614                 .pm = &phy_mdm6600_pm_ops,
 615                 .of_match_table = of_match_ptr(phy_mdm6600_id_table),
 616         },
 617 };
 618
 619 module_platform_driver(phy_mdm6600_driver);
 620
 621 MODULE_ALIAS("platform:gpio_usb");
 622 MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
 623 MODULE_DESCRIPTION("mdm6600 gpio usb phy driver");
 624 MODULE_LICENSE("GPL v2");