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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Palmas USB transceiver driver
4 *
5 * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com
6 * Author: Graeme Gregory <gg@slimlogic.co.uk>
7 * Author: Kishon Vijay Abraham I <kishon@ti.com>
8 * Based on twl6030_usb.c
9 * Author: Hema HK <hemahk@ti.com>
10 */
11
12#include <linux/module.h>
13#include <linux/interrupt.h>
14#include <linux/platform_device.h>
15#include <linux/slab.h>
16#include <linux/err.h>
17#include <linux/mfd/palmas.h>
18#include <linux/of.h>
19#include <linux/of_platform.h>
20#include <linux/of_gpio.h>
21#include <linux/gpio/consumer.h>
22#include <linux/workqueue.h>
23
24#define USB_GPIO_DEBOUNCE_MS 20 /* ms */
25
26static const unsigned int palmas_extcon_cable[] = {
27 EXTCON_USB,
28 EXTCON_USB_HOST,
29 EXTCON_NONE,
30};
31
32static void palmas_usb_wakeup(struct palmas *palmas, int enable)
33{
34 if (enable)
35 palmas_write(palmas, PALMAS_USB_OTG_BASE, PALMAS_USB_WAKEUP,
36 PALMAS_USB_WAKEUP_ID_WK_UP_COMP);
37 else
38 palmas_write(palmas, PALMAS_USB_OTG_BASE, PALMAS_USB_WAKEUP, 0);
39}
40
41static irqreturn_t palmas_vbus_irq_handler(int irq, void *_palmas_usb)
42{
43 struct palmas_usb *palmas_usb = _palmas_usb;
44 struct extcon_dev *edev = palmas_usb->edev;
45 unsigned int vbus_line_state;
46
47 palmas_read(palmas_usb->palmas, PALMAS_INTERRUPT_BASE,
48 PALMAS_INT3_LINE_STATE, &vbus_line_state);
49
50 if (vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS) {
51 if (palmas_usb->linkstat != PALMAS_USB_STATE_VBUS) {
52 palmas_usb->linkstat = PALMAS_USB_STATE_VBUS;
53 extcon_set_state_sync(edev, EXTCON_USB, true);
54 dev_dbg(palmas_usb->dev, "USB cable is attached\n");
55 } else {
56 dev_dbg(palmas_usb->dev,
57 "Spurious connect event detected\n");
58 }
59 } else if (!(vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS)) {
60 if (palmas_usb->linkstat == PALMAS_USB_STATE_VBUS) {
61 palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
62 extcon_set_state_sync(edev, EXTCON_USB, false);
63 dev_dbg(palmas_usb->dev, "USB cable is detached\n");
64 } else {
65 dev_dbg(palmas_usb->dev,
66 "Spurious disconnect event detected\n");
67 }
68 }
69
70 return IRQ_HANDLED;
71}
72
73static irqreturn_t palmas_id_irq_handler(int irq, void *_palmas_usb)
74{
75 unsigned int set, id_src;
76 struct palmas_usb *palmas_usb = _palmas_usb;
77 struct extcon_dev *edev = palmas_usb->edev;
78
79 palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
80 PALMAS_USB_ID_INT_LATCH_SET, &set);
81 palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
82 PALMAS_USB_ID_INT_SRC, &id_src);
83
84 if ((set & PALMAS_USB_ID_INT_SRC_ID_GND) &&
85 (id_src & PALMAS_USB_ID_INT_SRC_ID_GND)) {
86 palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
87 PALMAS_USB_ID_INT_LATCH_CLR,
88 PALMAS_USB_ID_INT_EN_HI_CLR_ID_GND);
89 palmas_usb->linkstat = PALMAS_USB_STATE_ID;
90 extcon_set_state_sync(edev, EXTCON_USB_HOST, true);
91 dev_dbg(palmas_usb->dev, "USB-HOST cable is attached\n");
92 } else if ((set & PALMAS_USB_ID_INT_SRC_ID_FLOAT) &&
93 (id_src & PALMAS_USB_ID_INT_SRC_ID_FLOAT)) {
94 palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
95 PALMAS_USB_ID_INT_LATCH_CLR,
96 PALMAS_USB_ID_INT_EN_HI_CLR_ID_FLOAT);
97 palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
98 extcon_set_state_sync(edev, EXTCON_USB_HOST, false);
99 dev_dbg(palmas_usb->dev, "USB-HOST cable is detached\n");
100 } else if ((palmas_usb->linkstat == PALMAS_USB_STATE_ID) &&
101 (!(set & PALMAS_USB_ID_INT_SRC_ID_GND))) {
102 palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
103 extcon_set_state_sync(edev, EXTCON_USB_HOST, false);
104 dev_dbg(palmas_usb->dev, "USB-HOST cable is detached\n");
105 } else if ((palmas_usb->linkstat == PALMAS_USB_STATE_DISCONNECT) &&
106 (id_src & PALMAS_USB_ID_INT_SRC_ID_GND)) {
107 palmas_usb->linkstat = PALMAS_USB_STATE_ID;
108 extcon_set_state_sync(edev, EXTCON_USB_HOST, true);
109 dev_dbg(palmas_usb->dev, " USB-HOST cable is attached\n");
110 }
111
112 return IRQ_HANDLED;
113}
114
115static void palmas_gpio_id_detect(struct work_struct *work)
116{
117 int id;
118 struct palmas_usb *palmas_usb = container_of(to_delayed_work(work),
119 struct palmas_usb,
120 wq_detectid);
121 struct extcon_dev *edev = palmas_usb->edev;
122
123 if (!palmas_usb->id_gpiod)
124 return;
125
126 id = gpiod_get_value_cansleep(palmas_usb->id_gpiod);
127
128 if (id) {
129 extcon_set_state_sync(edev, EXTCON_USB_HOST, false);
130 dev_dbg(palmas_usb->dev, "USB-HOST cable is detached\n");
131 } else {
132 extcon_set_state_sync(edev, EXTCON_USB_HOST, true);
133 dev_dbg(palmas_usb->dev, "USB-HOST cable is attached\n");
134 }
135}
136
137static irqreturn_t palmas_gpio_id_irq_handler(int irq, void *_palmas_usb)
138{
139 struct palmas_usb *palmas_usb = _palmas_usb;
140
141 queue_delayed_work(system_power_efficient_wq, &palmas_usb->wq_detectid,
142 palmas_usb->sw_debounce_jiffies);
143
144 return IRQ_HANDLED;
145}
146
147static void palmas_enable_irq(struct palmas_usb *palmas_usb)
148{
149 palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
150 PALMAS_USB_VBUS_CTRL_SET,
151 PALMAS_USB_VBUS_CTRL_SET_VBUS_ACT_COMP);
152
153 if (palmas_usb->enable_id_detection) {
154 palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
155 PALMAS_USB_ID_CTRL_SET,
156 PALMAS_USB_ID_CTRL_SET_ID_ACT_COMP);
157
158 palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
159 PALMAS_USB_ID_INT_EN_HI_SET,
160 PALMAS_USB_ID_INT_EN_HI_SET_ID_GND |
161 PALMAS_USB_ID_INT_EN_HI_SET_ID_FLOAT);
162 }
163
164 if (palmas_usb->enable_vbus_detection)
165 palmas_vbus_irq_handler(palmas_usb->vbus_irq, palmas_usb);
166
167 /* cold plug for host mode needs this delay */
168 if (palmas_usb->enable_id_detection) {
169 msleep(30);
170 palmas_id_irq_handler(palmas_usb->id_irq, palmas_usb);
171 }
172}
173
174static int palmas_usb_probe(struct platform_device *pdev)
175{
176 struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);
177 struct palmas_usb_platform_data *pdata = dev_get_platdata(&pdev->dev);
178 struct device_node *node = pdev->dev.of_node;
179 struct palmas_usb *palmas_usb;
180 int status;
181
182 if (!palmas) {
183 dev_err(&pdev->dev, "failed to get valid parent\n");
184 return -EINVAL;
185 }
186
187 palmas_usb = devm_kzalloc(&pdev->dev, sizeof(*palmas_usb), GFP_KERNEL);
188 if (!palmas_usb)
189 return -ENOMEM;
190
191 if (node && !pdata) {
192 palmas_usb->wakeup = of_property_read_bool(node, "ti,wakeup");
193 palmas_usb->enable_id_detection = of_property_read_bool(node,
194 "ti,enable-id-detection");
195 palmas_usb->enable_vbus_detection = of_property_read_bool(node,
196 "ti,enable-vbus-detection");
197 } else {
198 palmas_usb->wakeup = true;
199 palmas_usb->enable_id_detection = true;
200 palmas_usb->enable_vbus_detection = true;
201
202 if (pdata)
203 palmas_usb->wakeup = pdata->wakeup;
204 }
205
206 palmas_usb->id_gpiod = devm_gpiod_get_optional(&pdev->dev, "id",
207 GPIOD_IN);
208 if (PTR_ERR(palmas_usb->id_gpiod) == -EPROBE_DEFER) {
209 return -EPROBE_DEFER;
210 } else if (IS_ERR(palmas_usb->id_gpiod)) {
211 dev_err(&pdev->dev, "failed to get id gpio\n");
212 return PTR_ERR(palmas_usb->id_gpiod);
213 }
214
215 palmas_usb->vbus_gpiod = devm_gpiod_get_optional(&pdev->dev, "vbus",
216 GPIOD_IN);
217 if (PTR_ERR(palmas_usb->vbus_gpiod) == -EPROBE_DEFER) {
218 return -EPROBE_DEFER;
219 } else if (IS_ERR(palmas_usb->vbus_gpiod)) {
220 dev_err(&pdev->dev, "failed to get vbus gpio\n");
221 return PTR_ERR(palmas_usb->vbus_gpiod);
222 }
223
224 if (palmas_usb->enable_id_detection && palmas_usb->id_gpiod) {
225 palmas_usb->enable_id_detection = false;
226 palmas_usb->enable_gpio_id_detection = true;
227 }
228
229 if (palmas_usb->enable_vbus_detection && palmas_usb->vbus_gpiod) {
230 palmas_usb->enable_vbus_detection = false;
231 palmas_usb->enable_gpio_vbus_detection = true;
232 }
233
234 if (palmas_usb->enable_gpio_id_detection) {
235 u32 debounce;
236
237 if (of_property_read_u32(node, "debounce-delay-ms", &debounce))
238 debounce = USB_GPIO_DEBOUNCE_MS;
239
240 status = gpiod_set_debounce(palmas_usb->id_gpiod,
241 debounce * 1000);
242 if (status < 0)
243 palmas_usb->sw_debounce_jiffies = msecs_to_jiffies(debounce);
244 }
245
246 INIT_DELAYED_WORK(&palmas_usb->wq_detectid, palmas_gpio_id_detect);
247
248 palmas->usb = palmas_usb;
249 palmas_usb->palmas = palmas;
250
251 palmas_usb->dev = &pdev->dev;
252
253 palmas_usb_wakeup(palmas, palmas_usb->wakeup);
254
255 platform_set_drvdata(pdev, palmas_usb);
256
257 palmas_usb->edev = devm_extcon_dev_allocate(&pdev->dev,
258 palmas_extcon_cable);
259 if (IS_ERR(palmas_usb->edev)) {
260 dev_err(&pdev->dev, "failed to allocate extcon device\n");
261 return -ENOMEM;
262 }
263
264 status = devm_extcon_dev_register(&pdev->dev, palmas_usb->edev);
265 if (status) {
266 dev_err(&pdev->dev, "failed to register extcon device\n");
267 return status;
268 }
269
270 if (palmas_usb->enable_id_detection) {
271 palmas_usb->id_otg_irq = regmap_irq_get_virq(palmas->irq_data,
272 PALMAS_ID_OTG_IRQ);
273 palmas_usb->id_irq = regmap_irq_get_virq(palmas->irq_data,
274 PALMAS_ID_IRQ);
275 status = devm_request_threaded_irq(palmas_usb->dev,
276 palmas_usb->id_irq,
277 NULL, palmas_id_irq_handler,
278 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
279 IRQF_ONESHOT,
280 "palmas_usb_id", palmas_usb);
281 if (status < 0) {
282 dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
283 palmas_usb->id_irq, status);
284 return status;
285 }
286 } else if (palmas_usb->enable_gpio_id_detection) {
287 palmas_usb->gpio_id_irq = gpiod_to_irq(palmas_usb->id_gpiod);
288 if (palmas_usb->gpio_id_irq < 0) {
289 dev_err(&pdev->dev, "failed to get id irq\n");
290 return palmas_usb->gpio_id_irq;
291 }
292 status = devm_request_threaded_irq(&pdev->dev,
293 palmas_usb->gpio_id_irq,
294 NULL,
295 palmas_gpio_id_irq_handler,
296 IRQF_TRIGGER_RISING |
297 IRQF_TRIGGER_FALLING |
298 IRQF_ONESHOT,
299 "palmas_usb_id",
300 palmas_usb);
301 if (status < 0) {
302 dev_err(&pdev->dev,
303 "failed to request handler for id irq\n");
304 return status;
305 }
306 }
307
308 if (palmas_usb->enable_vbus_detection) {
309 palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data,
310 PALMAS_VBUS_OTG_IRQ);
311 palmas_usb->vbus_irq = regmap_irq_get_virq(palmas->irq_data,
312 PALMAS_VBUS_IRQ);
313 status = devm_request_threaded_irq(palmas_usb->dev,
314 palmas_usb->vbus_irq, NULL,
315 palmas_vbus_irq_handler,
316 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
317 IRQF_ONESHOT,
318 "palmas_usb_vbus", palmas_usb);
319 if (status < 0) {
320 dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
321 palmas_usb->vbus_irq, status);
322 return status;
323 }
324 } else if (palmas_usb->enable_gpio_vbus_detection) {
325 /* remux GPIO_1 as VBUSDET */
326 status = palmas_update_bits(palmas,
327 PALMAS_PU_PD_OD_BASE,
328 PALMAS_PRIMARY_SECONDARY_PAD1,
329 PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_MASK,
330 (1 << PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_SHIFT));
331 if (status < 0) {
332 dev_err(&pdev->dev, "can't remux GPIO1\n");
333 return status;
334 }
335
336 palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data,
337 PALMAS_VBUS_OTG_IRQ);
338 palmas_usb->gpio_vbus_irq = gpiod_to_irq(palmas_usb->vbus_gpiod);
339 if (palmas_usb->gpio_vbus_irq < 0) {
340 dev_err(&pdev->dev, "failed to get vbus irq\n");
341 return palmas_usb->gpio_vbus_irq;
342 }
343 status = devm_request_threaded_irq(&pdev->dev,
344 palmas_usb->gpio_vbus_irq,
345 NULL,
346 palmas_vbus_irq_handler,
347 IRQF_TRIGGER_FALLING |
348 IRQF_TRIGGER_RISING |
349 IRQF_ONESHOT,
350 "palmas_usb_vbus",
351 palmas_usb);
352 if (status < 0) {
353 dev_err(&pdev->dev,
354 "failed to request handler for vbus irq\n");
355 return status;
356 }
357 }
358
359 palmas_enable_irq(palmas_usb);
360 /* perform initial detection */
361 if (palmas_usb->enable_gpio_vbus_detection)
362 palmas_vbus_irq_handler(palmas_usb->gpio_vbus_irq, palmas_usb);
363 palmas_gpio_id_detect(&palmas_usb->wq_detectid.work);
364 device_set_wakeup_capable(&pdev->dev, true);
365 return 0;
366}
367
368static int palmas_usb_remove(struct platform_device *pdev)
369{
370 struct palmas_usb *palmas_usb = platform_get_drvdata(pdev);
371
372 cancel_delayed_work_sync(&palmas_usb->wq_detectid);
373
374 return 0;
375}
376
377#ifdef CONFIG_PM_SLEEP
378static int palmas_usb_suspend(struct device *dev)
379{
380 struct palmas_usb *palmas_usb = dev_get_drvdata(dev);
381
382 if (device_may_wakeup(dev)) {
383 if (palmas_usb->enable_vbus_detection)
384 enable_irq_wake(palmas_usb->vbus_irq);
385 if (palmas_usb->enable_gpio_vbus_detection)
386 enable_irq_wake(palmas_usb->gpio_vbus_irq);
387 if (palmas_usb->enable_id_detection)
388 enable_irq_wake(palmas_usb->id_irq);
389 if (palmas_usb->enable_gpio_id_detection)
390 enable_irq_wake(palmas_usb->gpio_id_irq);
391 }
392 return 0;
393}
394
395static int palmas_usb_resume(struct device *dev)
396{
397 struct palmas_usb *palmas_usb = dev_get_drvdata(dev);
398
399 if (device_may_wakeup(dev)) {
400 if (palmas_usb->enable_vbus_detection)
401 disable_irq_wake(palmas_usb->vbus_irq);
402 if (palmas_usb->enable_gpio_vbus_detection)
403 disable_irq_wake(palmas_usb->gpio_vbus_irq);
404 if (palmas_usb->enable_id_detection)
405 disable_irq_wake(palmas_usb->id_irq);
406 if (palmas_usb->enable_gpio_id_detection)
407 disable_irq_wake(palmas_usb->gpio_id_irq);
408 }
409
410 /* check if GPIO states changed while suspend/resume */
411 if (palmas_usb->enable_gpio_vbus_detection)
412 palmas_vbus_irq_handler(palmas_usb->gpio_vbus_irq, palmas_usb);
413 palmas_gpio_id_detect(&palmas_usb->wq_detectid.work);
414
415 return 0;
416};
417#endif
418
419static SIMPLE_DEV_PM_OPS(palmas_pm_ops, palmas_usb_suspend, palmas_usb_resume);
420
421static const struct of_device_id of_palmas_match_tbl[] = {
422 { .compatible = "ti,palmas-usb", },
423 { .compatible = "ti,palmas-usb-vid", },
424 { .compatible = "ti,twl6035-usb", },
425 { .compatible = "ti,twl6035-usb-vid", },
426 { /* end */ }
427};
428
429static struct platform_driver palmas_usb_driver = {
430 .probe = palmas_usb_probe,
431 .remove = palmas_usb_remove,
432 .driver = {
433 .name = "palmas-usb",
434 .of_match_table = of_palmas_match_tbl,
435 .pm = &palmas_pm_ops,
436 },
437};
438
439module_platform_driver(palmas_usb_driver);
440
441MODULE_ALIAS("platform:palmas-usb");
442MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>");
443MODULE_DESCRIPTION("Palmas USB transceiver driver");
444MODULE_LICENSE("GPL");
445MODULE_DEVICE_TABLE(of, of_palmas_match_tbl);
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Palmas USB transceiver driver
4 *
5 * Copyright (C) 2013 Texas Instruments Incorporated - https://www.ti.com
6 * Author: Graeme Gregory <gg@slimlogic.co.uk>
7 * Author: Kishon Vijay Abraham I <kishon@ti.com>
8 * Based on twl6030_usb.c
9 * Author: Hema HK <hemahk@ti.com>
10 */
11
12#include <linux/devm-helpers.h>
13#include <linux/module.h>
14#include <linux/interrupt.h>
15#include <linux/platform_device.h>
16#include <linux/slab.h>
17#include <linux/err.h>
18#include <linux/mfd/palmas.h>
19#include <linux/of.h>
20#include <linux/of_platform.h>
21#include <linux/of_gpio.h>
22#include <linux/gpio/consumer.h>
23#include <linux/workqueue.h>
24
25#define USB_GPIO_DEBOUNCE_MS 20 /* ms */
26
27static const unsigned int palmas_extcon_cable[] = {
28 EXTCON_USB,
29 EXTCON_USB_HOST,
30 EXTCON_NONE,
31};
32
33static void palmas_usb_wakeup(struct palmas *palmas, int enable)
34{
35 if (enable)
36 palmas_write(palmas, PALMAS_USB_OTG_BASE, PALMAS_USB_WAKEUP,
37 PALMAS_USB_WAKEUP_ID_WK_UP_COMP);
38 else
39 palmas_write(palmas, PALMAS_USB_OTG_BASE, PALMAS_USB_WAKEUP, 0);
40}
41
42static irqreturn_t palmas_vbus_irq_handler(int irq, void *_palmas_usb)
43{
44 struct palmas_usb *palmas_usb = _palmas_usb;
45 struct extcon_dev *edev = palmas_usb->edev;
46 unsigned int vbus_line_state;
47
48 palmas_read(palmas_usb->palmas, PALMAS_INTERRUPT_BASE,
49 PALMAS_INT3_LINE_STATE, &vbus_line_state);
50
51 if (vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS) {
52 if (palmas_usb->linkstat != PALMAS_USB_STATE_VBUS) {
53 palmas_usb->linkstat = PALMAS_USB_STATE_VBUS;
54 extcon_set_state_sync(edev, EXTCON_USB, true);
55 dev_dbg(palmas_usb->dev, "USB cable is attached\n");
56 } else {
57 dev_dbg(palmas_usb->dev,
58 "Spurious connect event detected\n");
59 }
60 } else if (!(vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS)) {
61 if (palmas_usb->linkstat == PALMAS_USB_STATE_VBUS) {
62 palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
63 extcon_set_state_sync(edev, EXTCON_USB, false);
64 dev_dbg(palmas_usb->dev, "USB cable is detached\n");
65 } else {
66 dev_dbg(palmas_usb->dev,
67 "Spurious disconnect event detected\n");
68 }
69 }
70
71 return IRQ_HANDLED;
72}
73
74static irqreturn_t palmas_id_irq_handler(int irq, void *_palmas_usb)
75{
76 unsigned int set, id_src;
77 struct palmas_usb *palmas_usb = _palmas_usb;
78 struct extcon_dev *edev = palmas_usb->edev;
79
80 palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
81 PALMAS_USB_ID_INT_LATCH_SET, &set);
82 palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
83 PALMAS_USB_ID_INT_SRC, &id_src);
84
85 if ((set & PALMAS_USB_ID_INT_SRC_ID_GND) &&
86 (id_src & PALMAS_USB_ID_INT_SRC_ID_GND)) {
87 palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
88 PALMAS_USB_ID_INT_LATCH_CLR,
89 PALMAS_USB_ID_INT_EN_HI_CLR_ID_GND);
90 palmas_usb->linkstat = PALMAS_USB_STATE_ID;
91 extcon_set_state_sync(edev, EXTCON_USB_HOST, true);
92 dev_dbg(palmas_usb->dev, "USB-HOST cable is attached\n");
93 } else if ((set & PALMAS_USB_ID_INT_SRC_ID_FLOAT) &&
94 (id_src & PALMAS_USB_ID_INT_SRC_ID_FLOAT)) {
95 palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
96 PALMAS_USB_ID_INT_LATCH_CLR,
97 PALMAS_USB_ID_INT_EN_HI_CLR_ID_FLOAT);
98 palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
99 extcon_set_state_sync(edev, EXTCON_USB_HOST, false);
100 dev_dbg(palmas_usb->dev, "USB-HOST cable is detached\n");
101 } else if ((palmas_usb->linkstat == PALMAS_USB_STATE_ID) &&
102 (!(set & PALMAS_USB_ID_INT_SRC_ID_GND))) {
103 palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
104 extcon_set_state_sync(edev, EXTCON_USB_HOST, false);
105 dev_dbg(palmas_usb->dev, "USB-HOST cable is detached\n");
106 } else if ((palmas_usb->linkstat == PALMAS_USB_STATE_DISCONNECT) &&
107 (id_src & PALMAS_USB_ID_INT_SRC_ID_GND)) {
108 palmas_usb->linkstat = PALMAS_USB_STATE_ID;
109 extcon_set_state_sync(edev, EXTCON_USB_HOST, true);
110 dev_dbg(palmas_usb->dev, "USB-HOST cable is attached\n");
111 }
112
113 return IRQ_HANDLED;
114}
115
116static void palmas_gpio_id_detect(struct work_struct *work)
117{
118 int id;
119 struct palmas_usb *palmas_usb = container_of(to_delayed_work(work),
120 struct palmas_usb,
121 wq_detectid);
122 struct extcon_dev *edev = palmas_usb->edev;
123
124 if (!palmas_usb->id_gpiod)
125 return;
126
127 id = gpiod_get_value_cansleep(palmas_usb->id_gpiod);
128
129 if (id) {
130 extcon_set_state_sync(edev, EXTCON_USB_HOST, false);
131 dev_dbg(palmas_usb->dev, "USB-HOST cable is detached\n");
132 } else {
133 extcon_set_state_sync(edev, EXTCON_USB_HOST, true);
134 dev_dbg(palmas_usb->dev, "USB-HOST cable is attached\n");
135 }
136}
137
138static irqreturn_t palmas_gpio_id_irq_handler(int irq, void *_palmas_usb)
139{
140 struct palmas_usb *palmas_usb = _palmas_usb;
141
142 queue_delayed_work(system_power_efficient_wq, &palmas_usb->wq_detectid,
143 palmas_usb->sw_debounce_jiffies);
144
145 return IRQ_HANDLED;
146}
147
148static void palmas_enable_irq(struct palmas_usb *palmas_usb)
149{
150 palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
151 PALMAS_USB_VBUS_CTRL_SET,
152 PALMAS_USB_VBUS_CTRL_SET_VBUS_ACT_COMP);
153
154 if (palmas_usb->enable_id_detection) {
155 palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
156 PALMAS_USB_ID_CTRL_SET,
157 PALMAS_USB_ID_CTRL_SET_ID_ACT_COMP);
158
159 palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
160 PALMAS_USB_ID_INT_EN_HI_SET,
161 PALMAS_USB_ID_INT_EN_HI_SET_ID_GND |
162 PALMAS_USB_ID_INT_EN_HI_SET_ID_FLOAT);
163 }
164
165 if (palmas_usb->enable_vbus_detection)
166 palmas_vbus_irq_handler(palmas_usb->vbus_irq, palmas_usb);
167
168 /* cold plug for host mode needs this delay */
169 if (palmas_usb->enable_id_detection) {
170 msleep(30);
171 palmas_id_irq_handler(palmas_usb->id_irq, palmas_usb);
172 }
173}
174
175static int palmas_usb_probe(struct platform_device *pdev)
176{
177 struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);
178 struct palmas_usb_platform_data *pdata = dev_get_platdata(&pdev->dev);
179 struct device_node *node = pdev->dev.of_node;
180 struct palmas_usb *palmas_usb;
181 int status;
182
183 if (!palmas) {
184 dev_err(&pdev->dev, "failed to get valid parent\n");
185 return -EINVAL;
186 }
187
188 palmas_usb = devm_kzalloc(&pdev->dev, sizeof(*palmas_usb), GFP_KERNEL);
189 if (!palmas_usb)
190 return -ENOMEM;
191
192 if (node && !pdata) {
193 palmas_usb->wakeup = of_property_read_bool(node, "ti,wakeup");
194 palmas_usb->enable_id_detection = of_property_read_bool(node,
195 "ti,enable-id-detection");
196 palmas_usb->enable_vbus_detection = of_property_read_bool(node,
197 "ti,enable-vbus-detection");
198 } else {
199 palmas_usb->wakeup = true;
200 palmas_usb->enable_id_detection = true;
201 palmas_usb->enable_vbus_detection = true;
202
203 if (pdata)
204 palmas_usb->wakeup = pdata->wakeup;
205 }
206
207 palmas_usb->id_gpiod = devm_gpiod_get_optional(&pdev->dev, "id",
208 GPIOD_IN);
209 if (IS_ERR(palmas_usb->id_gpiod))
210 return dev_err_probe(&pdev->dev, PTR_ERR(palmas_usb->id_gpiod),
211 "failed to get id gpio\n");
212
213 palmas_usb->vbus_gpiod = devm_gpiod_get_optional(&pdev->dev, "vbus",
214 GPIOD_IN);
215 if (IS_ERR(palmas_usb->vbus_gpiod))
216 return dev_err_probe(&pdev->dev, PTR_ERR(palmas_usb->vbus_gpiod),
217 "failed to get id gpio\n");
218
219 if (palmas_usb->enable_id_detection && palmas_usb->id_gpiod) {
220 palmas_usb->enable_id_detection = false;
221 palmas_usb->enable_gpio_id_detection = true;
222 }
223
224 if (palmas_usb->enable_vbus_detection && palmas_usb->vbus_gpiod) {
225 palmas_usb->enable_vbus_detection = false;
226 palmas_usb->enable_gpio_vbus_detection = true;
227 }
228
229 if (palmas_usb->enable_gpio_id_detection) {
230 u32 debounce;
231
232 if (of_property_read_u32(node, "debounce-delay-ms", &debounce))
233 debounce = USB_GPIO_DEBOUNCE_MS;
234
235 status = gpiod_set_debounce(palmas_usb->id_gpiod,
236 debounce * 1000);
237 if (status < 0)
238 palmas_usb->sw_debounce_jiffies = msecs_to_jiffies(debounce);
239 }
240
241 status = devm_delayed_work_autocancel(&pdev->dev,
242 &palmas_usb->wq_detectid,
243 palmas_gpio_id_detect);
244 if (status)
245 return status;
246
247 palmas->usb = palmas_usb;
248 palmas_usb->palmas = palmas;
249
250 palmas_usb->dev = &pdev->dev;
251
252 palmas_usb_wakeup(palmas, palmas_usb->wakeup);
253
254 platform_set_drvdata(pdev, palmas_usb);
255
256 palmas_usb->edev = devm_extcon_dev_allocate(&pdev->dev,
257 palmas_extcon_cable);
258 if (IS_ERR(palmas_usb->edev)) {
259 dev_err(&pdev->dev, "failed to allocate extcon device\n");
260 return -ENOMEM;
261 }
262
263 status = devm_extcon_dev_register(&pdev->dev, palmas_usb->edev);
264 if (status) {
265 dev_err(&pdev->dev, "failed to register extcon device\n");
266 return status;
267 }
268
269 if (palmas_usb->enable_id_detection) {
270 palmas_usb->id_otg_irq = regmap_irq_get_virq(palmas->irq_data,
271 PALMAS_ID_OTG_IRQ);
272 palmas_usb->id_irq = regmap_irq_get_virq(palmas->irq_data,
273 PALMAS_ID_IRQ);
274 status = devm_request_threaded_irq(palmas_usb->dev,
275 palmas_usb->id_irq,
276 NULL, palmas_id_irq_handler,
277 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
278 IRQF_ONESHOT,
279 "palmas_usb_id", palmas_usb);
280 if (status < 0) {
281 dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
282 palmas_usb->id_irq, status);
283 return status;
284 }
285 } else if (palmas_usb->enable_gpio_id_detection) {
286 palmas_usb->gpio_id_irq = gpiod_to_irq(palmas_usb->id_gpiod);
287 if (palmas_usb->gpio_id_irq < 0) {
288 dev_err(&pdev->dev, "failed to get id irq\n");
289 return palmas_usb->gpio_id_irq;
290 }
291 status = devm_request_threaded_irq(&pdev->dev,
292 palmas_usb->gpio_id_irq,
293 NULL,
294 palmas_gpio_id_irq_handler,
295 IRQF_TRIGGER_RISING |
296 IRQF_TRIGGER_FALLING |
297 IRQF_ONESHOT,
298 "palmas_usb_id",
299 palmas_usb);
300 if (status < 0) {
301 dev_err(&pdev->dev,
302 "failed to request handler for id irq\n");
303 return status;
304 }
305 }
306
307 if (palmas_usb->enable_vbus_detection) {
308 palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data,
309 PALMAS_VBUS_OTG_IRQ);
310 palmas_usb->vbus_irq = regmap_irq_get_virq(palmas->irq_data,
311 PALMAS_VBUS_IRQ);
312 status = devm_request_threaded_irq(palmas_usb->dev,
313 palmas_usb->vbus_irq, NULL,
314 palmas_vbus_irq_handler,
315 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
316 IRQF_ONESHOT,
317 "palmas_usb_vbus", palmas_usb);
318 if (status < 0) {
319 dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
320 palmas_usb->vbus_irq, status);
321 return status;
322 }
323 } else if (palmas_usb->enable_gpio_vbus_detection) {
324 /* remux GPIO_1 as VBUSDET */
325 status = palmas_update_bits(palmas,
326 PALMAS_PU_PD_OD_BASE,
327 PALMAS_PRIMARY_SECONDARY_PAD1,
328 PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_MASK,
329 (1 << PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_SHIFT));
330 if (status < 0) {
331 dev_err(&pdev->dev, "can't remux GPIO1\n");
332 return status;
333 }
334
335 palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data,
336 PALMAS_VBUS_OTG_IRQ);
337 palmas_usb->gpio_vbus_irq = gpiod_to_irq(palmas_usb->vbus_gpiod);
338 if (palmas_usb->gpio_vbus_irq < 0) {
339 dev_err(&pdev->dev, "failed to get vbus irq\n");
340 return palmas_usb->gpio_vbus_irq;
341 }
342 status = devm_request_threaded_irq(&pdev->dev,
343 palmas_usb->gpio_vbus_irq,
344 NULL,
345 palmas_vbus_irq_handler,
346 IRQF_TRIGGER_FALLING |
347 IRQF_TRIGGER_RISING |
348 IRQF_ONESHOT,
349 "palmas_usb_vbus",
350 palmas_usb);
351 if (status < 0) {
352 dev_err(&pdev->dev,
353 "failed to request handler for vbus irq\n");
354 return status;
355 }
356 }
357
358 palmas_enable_irq(palmas_usb);
359 /* perform initial detection */
360 if (palmas_usb->enable_gpio_vbus_detection)
361 palmas_vbus_irq_handler(palmas_usb->gpio_vbus_irq, palmas_usb);
362 palmas_gpio_id_detect(&palmas_usb->wq_detectid.work);
363 device_set_wakeup_capable(&pdev->dev, true);
364 return 0;
365}
366
367#ifdef CONFIG_PM_SLEEP
368static int palmas_usb_suspend(struct device *dev)
369{
370 struct palmas_usb *palmas_usb = dev_get_drvdata(dev);
371
372 if (device_may_wakeup(dev)) {
373 if (palmas_usb->enable_vbus_detection)
374 enable_irq_wake(palmas_usb->vbus_irq);
375 if (palmas_usb->enable_gpio_vbus_detection)
376 enable_irq_wake(palmas_usb->gpio_vbus_irq);
377 if (palmas_usb->enable_id_detection)
378 enable_irq_wake(palmas_usb->id_irq);
379 if (palmas_usb->enable_gpio_id_detection)
380 enable_irq_wake(palmas_usb->gpio_id_irq);
381 }
382 return 0;
383}
384
385static int palmas_usb_resume(struct device *dev)
386{
387 struct palmas_usb *palmas_usb = dev_get_drvdata(dev);
388
389 if (device_may_wakeup(dev)) {
390 if (palmas_usb->enable_vbus_detection)
391 disable_irq_wake(palmas_usb->vbus_irq);
392 if (palmas_usb->enable_gpio_vbus_detection)
393 disable_irq_wake(palmas_usb->gpio_vbus_irq);
394 if (palmas_usb->enable_id_detection)
395 disable_irq_wake(palmas_usb->id_irq);
396 if (palmas_usb->enable_gpio_id_detection)
397 disable_irq_wake(palmas_usb->gpio_id_irq);
398 }
399
400 /* check if GPIO states changed while suspend/resume */
401 if (palmas_usb->enable_gpio_vbus_detection)
402 palmas_vbus_irq_handler(palmas_usb->gpio_vbus_irq, palmas_usb);
403 palmas_gpio_id_detect(&palmas_usb->wq_detectid.work);
404
405 return 0;
406};
407#endif
408
409static SIMPLE_DEV_PM_OPS(palmas_pm_ops, palmas_usb_suspend, palmas_usb_resume);
410
411static const struct of_device_id of_palmas_match_tbl[] = {
412 { .compatible = "ti,palmas-usb", },
413 { .compatible = "ti,palmas-usb-vid", },
414 { .compatible = "ti,twl6035-usb", },
415 { .compatible = "ti,twl6035-usb-vid", },
416 { /* end */ }
417};
418
419static struct platform_driver palmas_usb_driver = {
420 .probe = palmas_usb_probe,
421 .driver = {
422 .name = "palmas-usb",
423 .of_match_table = of_palmas_match_tbl,
424 .pm = &palmas_pm_ops,
425 },
426};
427
428module_platform_driver(palmas_usb_driver);
429
430MODULE_ALIAS("platform:palmas-usb");
431MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>");
432MODULE_DESCRIPTION("Palmas USB transceiver driver");
433MODULE_LICENSE("GPL");
434MODULE_DEVICE_TABLE(of, of_palmas_match_tbl);