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 	int values[PHY_MDM6600_NR_CMD_LINES];
161 	int i;
162 
163 	val &= (1 << PHY_MDM6600_NR_CMD_LINES) - 1;
164 	for (i = 0; i < PHY_MDM6600_NR_CMD_LINES; i++)
165 		values[i] = (val & BIT(i)) >> i;
166 
167 	gpiod_set_array_value_cansleep(PHY_MDM6600_NR_CMD_LINES,
168 				       ddata->cmd_gpios->desc, values);
169 }
170 
171 /**
172  * phy_mdm6600_status() - read mdm6600 status lines
173  * @ddata: device driver data
174  */
175 static void phy_mdm6600_status(struct work_struct *work)
176 {
177 	struct phy_mdm6600 *ddata;
178 	struct device *dev;
179 	int values[PHY_MDM6600_NR_STATUS_LINES];
180 	int error, i, val = 0;
181 
182 	ddata = container_of(work, struct phy_mdm6600, status_work.work);
183 	dev = ddata->dev;
184 
185 	error = gpiod_get_array_value_cansleep(PHY_MDM6600_NR_CMD_LINES,
186 					       ddata->status_gpios->desc,
187 					       values);
188 	if (error)
189 		return;
190 
191 	for (i = 0; i < PHY_MDM6600_NR_CMD_LINES; i++) {
192 		val |= values[i] << i;
193 		dev_dbg(ddata->dev, "XXX %s: i: %i values[i]: %i val: %i\n",
194 			__func__, i, values[i], val);
195 	}
196 	ddata->status = val;
197 
198 	dev_info(dev, "modem status: %i %s\n",
199 		 ddata->status,
200 		 phy_mdm6600_status_name[ddata->status & 7]);
201 	complete(&ddata->ack);
202 }
203 
204 static irqreturn_t phy_mdm6600_irq_thread(int irq, void *data)
205 {
206 	struct phy_mdm6600 *ddata = data;
207 
208 	schedule_delayed_work(&ddata->status_work, msecs_to_jiffies(10));
209 
210 	return IRQ_HANDLED;
211 }
212 
213 /**
214  * phy_mdm6600_wakeirq_thread - handle mode1 line OOB wake after booting
215  * @irq: interrupt
216  * @data: interrupt handler data
217  *
218  * GPIO mode1 is used initially as output to configure the USB boot
219  * mode for mdm6600. After booting it is used as input for OOB wake
220  * signal from mdm6600 to the SoC. Just use it for debug info only
221  * for now.
222  */
223 static irqreturn_t phy_mdm6600_wakeirq_thread(int irq, void *data)
224 {
225 	struct phy_mdm6600 *ddata = data;
226 	struct gpio_desc *mode_gpio1;
227 
228 	mode_gpio1 = ddata->mode_gpios->desc[PHY_MDM6600_MODE1];
229 	dev_dbg(ddata->dev, "OOB wake on mode_gpio1: %i\n",
230 		gpiod_get_value(mode_gpio1));
231 
232 	return IRQ_HANDLED;
233 }
234 
235 /**
236  * phy_mdm6600_init_irq() - initialize mdm6600 status IRQ lines
237  * @ddata: device driver data
238  */
239 static void phy_mdm6600_init_irq(struct phy_mdm6600 *ddata)
240 {
241 	struct device *dev = ddata->dev;
242 	int i, error, irq;
243 
244 	for (i = PHY_MDM6600_STATUS0;
245 	     i <= PHY_MDM6600_STATUS2; i++) {
246 		struct gpio_desc *gpio = ddata->status_gpios->desc[i];
247 
248 		irq = gpiod_to_irq(gpio);
249 		if (irq <= 0)
250 			continue;
251 
252 		error = devm_request_threaded_irq(dev, irq, NULL,
253 					phy_mdm6600_irq_thread,
254 					IRQF_TRIGGER_RISING |
255 					IRQF_TRIGGER_FALLING |
256 					IRQF_ONESHOT,
257 					"mdm6600",
258 					ddata);
259 		if (error)
260 			dev_warn(dev, "no modem status irq%i: %i\n",
261 				 irq, error);
262 	}
263 }
264 
265 struct phy_mdm6600_map {
266 	const char *name;
267 	int direction;
268 };
269 
270 static const struct phy_mdm6600_map
271 phy_mdm6600_ctrl_gpio_map[PHY_MDM6600_NR_CTRL_LINES] = {
272 	{ "enable", GPIOD_OUT_LOW, },		/* low = phy disabled */
273 	{ "power", GPIOD_OUT_LOW, },		/* low = off */
274 	{ "reset", GPIOD_OUT_HIGH, },		/* high = reset */
275 };
276 
277 /**
278  * phy_mdm6600_init_lines() - initialize mdm6600 GPIO lines
279  * @ddata: device driver data
280  */
281 static int phy_mdm6600_init_lines(struct phy_mdm6600 *ddata)
282 {
283 	struct device *dev = ddata->dev;
284 	int i;
285 
286 	/* MDM6600 control lines */
287 	for (i = 0; i < ARRAY_SIZE(phy_mdm6600_ctrl_gpio_map); i++) {
288 		const struct phy_mdm6600_map *map =
289 			&phy_mdm6600_ctrl_gpio_map[i];
290 		struct gpio_desc **gpio = &ddata->ctrl_gpios[i];
291 
292 		*gpio = devm_gpiod_get(dev, map->name, map->direction);
293 		if (IS_ERR(*gpio)) {
294 			dev_info(dev, "gpio %s error %li\n",
295 				 map->name, PTR_ERR(*gpio));
296 			return PTR_ERR(*gpio);
297 		}
298 	}
299 
300 	/* MDM6600 USB start-up mode output lines */
301 	ddata->mode_gpios = devm_gpiod_get_array(dev, "motorola,mode",
302 						 GPIOD_OUT_LOW);
303 	if (IS_ERR(ddata->mode_gpios))
304 		return PTR_ERR(ddata->mode_gpios);
305 
306 	if (ddata->mode_gpios->ndescs != PHY_MDM6600_NR_MODE_LINES)
307 		return -EINVAL;
308 
309 	/* MDM6600 status input lines */
310 	ddata->status_gpios = devm_gpiod_get_array(dev, "motorola,status",
311 						   GPIOD_IN);
312 	if (IS_ERR(ddata->status_gpios))
313 		return PTR_ERR(ddata->status_gpios);
314 
315 	if (ddata->status_gpios->ndescs != PHY_MDM6600_NR_STATUS_LINES)
316 		return -EINVAL;
317 
318 	/* MDM6600 cmd output lines */
319 	ddata->cmd_gpios = devm_gpiod_get_array(dev, "motorola,cmd",
320 						GPIOD_OUT_LOW);
321 	if (IS_ERR(ddata->cmd_gpios))
322 		return PTR_ERR(ddata->cmd_gpios);
323 
324 	if (ddata->cmd_gpios->ndescs != PHY_MDM6600_NR_CMD_LINES)
325 		return -EINVAL;
326 
327 	return 0;
328 }
329 
330 /**
331  * phy_mdm6600_device_power_on() - power on mdm6600 device
332  * @ddata: device driver data
333  *
334  * To get the integrated USB phy in MDM6600 takes some hoops. We must ensure
335  * the shared USB bootmode GPIOs are configured, then request modem start-up,
336  * reset and power-up.. And then we need to recycle the shared USB bootmode
337  * GPIOs as they are also used for Out of Band (OOB) wake for the USB and
338  * TS 27.010 serial mux.
339  */
340 static int phy_mdm6600_device_power_on(struct phy_mdm6600 *ddata)
341 {
342 	struct gpio_desc *mode_gpio0, *mode_gpio1, *reset_gpio, *power_gpio;
343 	int error = 0, wakeirq;
344 
345 	mode_gpio0 = ddata->mode_gpios->desc[PHY_MDM6600_MODE0];
346 	mode_gpio1 = ddata->mode_gpios->desc[PHY_MDM6600_MODE1];
347 	reset_gpio = ddata->ctrl_gpios[PHY_MDM6600_RESET];
348 	power_gpio = ddata->ctrl_gpios[PHY_MDM6600_POWER];
349 
350 	/*
351 	 * Shared GPIOs must be low for normal USB mode. After booting
352 	 * they are used for OOB wake signaling. These can be also used
353 	 * to configure USB flashing mode later on based on a module
354 	 * parameter.
355 	 */
356 	gpiod_set_value_cansleep(mode_gpio0, 0);
357 	gpiod_set_value_cansleep(mode_gpio1, 0);
358 
359 	/* Request start-up mode */
360 	phy_mdm6600_cmd(ddata, PHY_MDM6600_CMD_NO_BYPASS);
361 
362 	/* Request a reset first */
363 	gpiod_set_value_cansleep(reset_gpio, 0);
364 	msleep(100);
365 
366 	/* Toggle power GPIO to request mdm6600 to start */
367 	gpiod_set_value_cansleep(power_gpio, 1);
368 	msleep(100);
369 	gpiod_set_value_cansleep(power_gpio, 0);
370 
371 	/*
372 	 * Looks like the USB PHY needs between 2.2 to 4 seconds.
373 	 * If we try to use it before that, we will get L3 errors
374 	 * from omap-usb-host trying to access the PHY. See also
375 	 * phy_mdm6600_init() for -EPROBE_DEFER.
376 	 */
377 	msleep(PHY_MDM6600_PHY_DELAY_MS);
378 	ddata->enabled = true;
379 
380 	/* Booting up the rest of MDM6600 will take total about 8 seconds */
381 	dev_info(ddata->dev, "Waiting for power up request to complete..\n");
382 	if (wait_for_completion_timeout(&ddata->ack,
383 			msecs_to_jiffies(PHY_MDM6600_ENABLED_DELAY_MS))) {
384 		if (ddata->status > PHY_MDM6600_STATUS_PANIC &&
385 		    ddata->status < PHY_MDM6600_STATUS_SHUTDOWN_ACK)
386 			dev_info(ddata->dev, "Powered up OK\n");
387 	} else {
388 		ddata->enabled = false;
389 		error = -ETIMEDOUT;
390 		dev_err(ddata->dev, "Timed out powering up\n");
391 	}
392 
393 	/* Reconfigure mode1 GPIO as input for OOB wake */
394 	gpiod_direction_input(mode_gpio1);
395 
396 	wakeirq = gpiod_to_irq(mode_gpio1);
397 	if (wakeirq <= 0)
398 		return wakeirq;
399 
400 	error = devm_request_threaded_irq(ddata->dev, wakeirq, NULL,
401 					  phy_mdm6600_wakeirq_thread,
402 					  IRQF_TRIGGER_RISING |
403 					  IRQF_TRIGGER_FALLING |
404 					  IRQF_ONESHOT,
405 					  "mdm6600-wake",
406 					  ddata);
407 	if (error)
408 		dev_warn(ddata->dev, "no modem wakeirq irq%i: %i\n",
409 			 wakeirq, error);
410 
411 	ddata->running = true;
412 
413 	return error;
414 }
415 
416 /**
417  * phy_mdm6600_device_power_off() - power off mdm6600 device
418  * @ddata: device driver data
419  */
420 static void phy_mdm6600_device_power_off(struct phy_mdm6600 *ddata)
421 {
422 	struct gpio_desc *reset_gpio =
423 		ddata->ctrl_gpios[PHY_MDM6600_RESET];
424 
425 	ddata->enabled = false;
426 	phy_mdm6600_cmd(ddata, PHY_MDM6600_CMD_BP_SHUTDOWN_REQ);
427 	msleep(100);
428 
429 	gpiod_set_value_cansleep(reset_gpio, 1);
430 
431 	dev_info(ddata->dev, "Waiting for power down request to complete.. ");
432 	if (wait_for_completion_timeout(&ddata->ack,
433 					msecs_to_jiffies(5000))) {
434 		if (ddata->status == PHY_MDM6600_STATUS_PANIC)
435 			dev_info(ddata->dev, "Powered down OK\n");
436 	} else {
437 		dev_err(ddata->dev, "Timed out powering down\n");
438 	}
439 }
440 
441 static void phy_mdm6600_deferred_power_on(struct work_struct *work)
442 {
443 	struct phy_mdm6600 *ddata;
444 	int error;
445 
446 	ddata = container_of(work, struct phy_mdm6600, bootup_work.work);
447 
448 	error = phy_mdm6600_device_power_on(ddata);
449 	if (error)
450 		dev_err(ddata->dev, "Device not functional\n");
451 }
452 
453 /*
454  * USB suspend puts mdm6600 into low power mode. For any n_gsm using apps,
455  * we need to keep the modem awake by kicking it's mode0 GPIO. This will
456  * keep the modem awake for about 1.2 seconds. When no n_gsm apps are using
457  * the modem, runtime PM auto mode can be enabled so modem can enter low
458  * power mode.
459  */
460 static void phy_mdm6600_wake_modem(struct phy_mdm6600 *ddata)
461 {
462 	struct gpio_desc *mode_gpio0;
463 
464 	mode_gpio0 = ddata->mode_gpios->desc[PHY_MDM6600_MODE0];
465 	gpiod_set_value_cansleep(mode_gpio0, 1);
466 	usleep_range(5, 15);
467 	gpiod_set_value_cansleep(mode_gpio0, 0);
468 	if (ddata->awake)
469 		usleep_range(5, 15);
470 	else
471 		msleep(MDM6600_MODEM_WAKE_DELAY_MS);
472 }
473 
474 static void phy_mdm6600_modem_wake(struct work_struct *work)
475 {
476 	struct phy_mdm6600 *ddata;
477 
478 	ddata = container_of(work, struct phy_mdm6600, modem_wake_work.work);
479 	phy_mdm6600_wake_modem(ddata);
480 	schedule_delayed_work(&ddata->modem_wake_work,
481 			      msecs_to_jiffies(MDM6600_MODEM_IDLE_DELAY_MS));
482 }
483 
484 static int __maybe_unused phy_mdm6600_runtime_suspend(struct device *dev)
485 {
486 	struct phy_mdm6600 *ddata = dev_get_drvdata(dev);
487 
488 	cancel_delayed_work_sync(&ddata->modem_wake_work);
489 	ddata->awake = false;
490 
491 	return 0;
492 }
493 
494 static int __maybe_unused phy_mdm6600_runtime_resume(struct device *dev)
495 {
496 	struct phy_mdm6600 *ddata = dev_get_drvdata(dev);
497 
498 	phy_mdm6600_modem_wake(&ddata->modem_wake_work.work);
499 	ddata->awake = true;
500 
501 	return 0;
502 }
503 
504 static const struct dev_pm_ops phy_mdm6600_pm_ops = {
505 	SET_RUNTIME_PM_OPS(phy_mdm6600_runtime_suspend,
506 			   phy_mdm6600_runtime_resume, NULL)
507 };
508 
509 static const struct of_device_id phy_mdm6600_id_table[] = {
510 	{ .compatible = "motorola,mapphone-mdm6600", },
511 	{},
512 };
513 MODULE_DEVICE_TABLE(of, phy_mdm6600_id_table);
514 
515 static int phy_mdm6600_probe(struct platform_device *pdev)
516 {
517 	struct phy_mdm6600 *ddata;
518 	int error;
519 
520 	ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
521 	if (!ddata)
522 		return -ENOMEM;
523 
524 	INIT_DELAYED_WORK(&ddata->bootup_work,
525 			  phy_mdm6600_deferred_power_on);
526 	INIT_DELAYED_WORK(&ddata->status_work, phy_mdm6600_status);
527 	INIT_DELAYED_WORK(&ddata->modem_wake_work, phy_mdm6600_modem_wake);
528 	init_completion(&ddata->ack);
529 
530 	ddata->dev = &pdev->dev;
531 	platform_set_drvdata(pdev, ddata);
532 
533 	error = phy_mdm6600_init_lines(ddata);
534 	if (error)
535 		return error;
536 
537 	phy_mdm6600_init_irq(ddata);
538 
539 	ddata->generic_phy = devm_phy_create(ddata->dev, NULL, &gpio_usb_ops);
540 	if (IS_ERR(ddata->generic_phy)) {
541 		error = PTR_ERR(ddata->generic_phy);
542 		goto cleanup;
543 	}
544 
545 	phy_set_drvdata(ddata->generic_phy, ddata);
546 
547 	ddata->phy_provider =
548 		devm_of_phy_provider_register(ddata->dev,
549 					      of_phy_simple_xlate);
550 	if (IS_ERR(ddata->phy_provider)) {
551 		error = PTR_ERR(ddata->phy_provider);
552 		goto cleanup;
553 	}
554 
555 	schedule_delayed_work(&ddata->bootup_work, 0);
556 
557 	/*
558 	 * See phy_mdm6600_device_power_on(). We should be able
559 	 * to remove this eventually when ohci-platform can deal
560 	 * with -EPROBE_DEFER.
561 	 */
562 	msleep(PHY_MDM6600_PHY_DELAY_MS + 500);
563 
564 	/*
565 	 * Enable PM runtime only after PHY has been powered up properly.
566 	 * It is currently only needed after USB suspends mdm6600 and n_gsm
567 	 * needs to access the device. We don't want to do this earlier as
568 	 * gpio mode0 pin doubles as mdm6600 wake-up gpio.
569 	 */
570 	pm_runtime_use_autosuspend(ddata->dev);
571 	pm_runtime_set_autosuspend_delay(ddata->dev,
572 					 MDM6600_MODEM_IDLE_DELAY_MS);
573 	pm_runtime_enable(ddata->dev);
574 	error = pm_runtime_get_sync(ddata->dev);
575 	if (error < 0) {
576 		dev_warn(ddata->dev, "failed to wake modem: %i\n", error);
577 		pm_runtime_put_noidle(ddata->dev);
578 	}
579 	pm_runtime_mark_last_busy(ddata->dev);
580 	pm_runtime_put_autosuspend(ddata->dev);
581 
582 	return 0;
583 
584 cleanup:
585 	phy_mdm6600_device_power_off(ddata);
586 	return error;
587 }
588 
589 static int phy_mdm6600_remove(struct platform_device *pdev)
590 {
591 	struct phy_mdm6600 *ddata = platform_get_drvdata(pdev);
592 	struct gpio_desc *reset_gpio = ddata->ctrl_gpios[PHY_MDM6600_RESET];
593 
594 	pm_runtime_dont_use_autosuspend(ddata->dev);
595 	pm_runtime_put_sync(ddata->dev);
596 	pm_runtime_disable(ddata->dev);
597 
598 	if (!ddata->running)
599 		wait_for_completion_timeout(&ddata->ack,
600 			msecs_to_jiffies(PHY_MDM6600_ENABLED_DELAY_MS));
601 
602 	gpiod_set_value_cansleep(reset_gpio, 1);
603 	phy_mdm6600_device_power_off(ddata);
604 
605 	cancel_delayed_work_sync(&ddata->modem_wake_work);
606 	cancel_delayed_work_sync(&ddata->bootup_work);
607 	cancel_delayed_work_sync(&ddata->status_work);
608 
609 	return 0;
610 }
611 
612 static struct platform_driver phy_mdm6600_driver = {
613 	.probe = phy_mdm6600_probe,
614 	.remove = phy_mdm6600_remove,
615 	.driver = {
616 		.name = "phy-mapphone-mdm6600",
617 		.pm = &phy_mdm6600_pm_ops,
618 		.of_match_table = of_match_ptr(phy_mdm6600_id_table),
619 	},
620 };
621 
622 module_platform_driver(phy_mdm6600_driver);
623 
624 MODULE_ALIAS("platform:gpio_usb");
625 MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
626 MODULE_DESCRIPTION("mdm6600 gpio usb phy driver");
627 MODULE_LICENSE("GPL v2");
628