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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 (IS_ERR(palmas_usb->id_gpiod)) {
209 dev_err(&pdev->dev, "failed to get id gpio\n");
210 return PTR_ERR(palmas_usb->id_gpiod);
211 }
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 dev_err(&pdev->dev, "failed to get vbus gpio\n");
217 return PTR_ERR(palmas_usb->vbus_gpiod);
218 }
219
220 if (palmas_usb->enable_id_detection && palmas_usb->id_gpiod) {
221 palmas_usb->enable_id_detection = false;
222 palmas_usb->enable_gpio_id_detection = true;
223 }
224
225 if (palmas_usb->enable_vbus_detection && palmas_usb->vbus_gpiod) {
226 palmas_usb->enable_vbus_detection = false;
227 palmas_usb->enable_gpio_vbus_detection = true;
228 }
229
230 if (palmas_usb->enable_gpio_id_detection) {
231 u32 debounce;
232
233 if (of_property_read_u32(node, "debounce-delay-ms", &debounce))
234 debounce = USB_GPIO_DEBOUNCE_MS;
235
236 status = gpiod_set_debounce(palmas_usb->id_gpiod,
237 debounce * 1000);
238 if (status < 0)
239 palmas_usb->sw_debounce_jiffies = msecs_to_jiffies(debounce);
240 }
241
242 INIT_DELAYED_WORK(&palmas_usb->wq_detectid, palmas_gpio_id_detect);
243
244 palmas->usb = palmas_usb;
245 palmas_usb->palmas = palmas;
246
247 palmas_usb->dev = &pdev->dev;
248
249 palmas_usb_wakeup(palmas, palmas_usb->wakeup);
250
251 platform_set_drvdata(pdev, palmas_usb);
252
253 palmas_usb->edev = devm_extcon_dev_allocate(&pdev->dev,
254 palmas_extcon_cable);
255 if (IS_ERR(palmas_usb->edev)) {
256 dev_err(&pdev->dev, "failed to allocate extcon device\n");
257 return -ENOMEM;
258 }
259
260 status = devm_extcon_dev_register(&pdev->dev, palmas_usb->edev);
261 if (status) {
262 dev_err(&pdev->dev, "failed to register extcon device\n");
263 return status;
264 }
265
266 if (palmas_usb->enable_id_detection) {
267 palmas_usb->id_otg_irq = regmap_irq_get_virq(palmas->irq_data,
268 PALMAS_ID_OTG_IRQ);
269 palmas_usb->id_irq = regmap_irq_get_virq(palmas->irq_data,
270 PALMAS_ID_IRQ);
271 status = devm_request_threaded_irq(palmas_usb->dev,
272 palmas_usb->id_irq,
273 NULL, palmas_id_irq_handler,
274 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
275 IRQF_ONESHOT,
276 "palmas_usb_id", palmas_usb);
277 if (status < 0) {
278 dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
279 palmas_usb->id_irq, status);
280 return status;
281 }
282 } else if (palmas_usb->enable_gpio_id_detection) {
283 palmas_usb->gpio_id_irq = gpiod_to_irq(palmas_usb->id_gpiod);
284 if (palmas_usb->gpio_id_irq < 0) {
285 dev_err(&pdev->dev, "failed to get id irq\n");
286 return palmas_usb->gpio_id_irq;
287 }
288 status = devm_request_threaded_irq(&pdev->dev,
289 palmas_usb->gpio_id_irq,
290 NULL,
291 palmas_gpio_id_irq_handler,
292 IRQF_TRIGGER_RISING |
293 IRQF_TRIGGER_FALLING |
294 IRQF_ONESHOT,
295 "palmas_usb_id",
296 palmas_usb);
297 if (status < 0) {
298 dev_err(&pdev->dev,
299 "failed to request handler for id irq\n");
300 return status;
301 }
302 }
303
304 if (palmas_usb->enable_vbus_detection) {
305 palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data,
306 PALMAS_VBUS_OTG_IRQ);
307 palmas_usb->vbus_irq = regmap_irq_get_virq(palmas->irq_data,
308 PALMAS_VBUS_IRQ);
309 status = devm_request_threaded_irq(palmas_usb->dev,
310 palmas_usb->vbus_irq, NULL,
311 palmas_vbus_irq_handler,
312 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
313 IRQF_ONESHOT,
314 "palmas_usb_vbus", palmas_usb);
315 if (status < 0) {
316 dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
317 palmas_usb->vbus_irq, status);
318 return status;
319 }
320 } else if (palmas_usb->enable_gpio_vbus_detection) {
321 /* remux GPIO_1 as VBUSDET */
322 status = palmas_update_bits(palmas,
323 PALMAS_PU_PD_OD_BASE,
324 PALMAS_PRIMARY_SECONDARY_PAD1,
325 PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_MASK,
326 (1 << PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_SHIFT));
327 if (status < 0) {
328 dev_err(&pdev->dev, "can't remux GPIO1\n");
329 return status;
330 }
331
332 palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data,
333 PALMAS_VBUS_OTG_IRQ);
334 palmas_usb->gpio_vbus_irq = gpiod_to_irq(palmas_usb->vbus_gpiod);
335 if (palmas_usb->gpio_vbus_irq < 0) {
336 dev_err(&pdev->dev, "failed to get vbus irq\n");
337 return palmas_usb->gpio_vbus_irq;
338 }
339 status = devm_request_threaded_irq(&pdev->dev,
340 palmas_usb->gpio_vbus_irq,
341 NULL,
342 palmas_vbus_irq_handler,
343 IRQF_TRIGGER_FALLING |
344 IRQF_TRIGGER_RISING |
345 IRQF_ONESHOT,
346 "palmas_usb_vbus",
347 palmas_usb);
348 if (status < 0) {
349 dev_err(&pdev->dev,
350 "failed to request handler for vbus irq\n");
351 return status;
352 }
353 }
354
355 palmas_enable_irq(palmas_usb);
356 /* perform initial detection */
357 if (palmas_usb->enable_gpio_vbus_detection)
358 palmas_vbus_irq_handler(palmas_usb->gpio_vbus_irq, palmas_usb);
359 palmas_gpio_id_detect(&palmas_usb->wq_detectid.work);
360 device_set_wakeup_capable(&pdev->dev, true);
361 return 0;
362}
363
364static int palmas_usb_remove(struct platform_device *pdev)
365{
366 struct palmas_usb *palmas_usb = platform_get_drvdata(pdev);
367
368 cancel_delayed_work_sync(&palmas_usb->wq_detectid);
369
370 return 0;
371}
372
373#ifdef CONFIG_PM_SLEEP
374static int palmas_usb_suspend(struct device *dev)
375{
376 struct palmas_usb *palmas_usb = dev_get_drvdata(dev);
377
378 if (device_may_wakeup(dev)) {
379 if (palmas_usb->enable_vbus_detection)
380 enable_irq_wake(palmas_usb->vbus_irq);
381 if (palmas_usb->enable_gpio_vbus_detection)
382 enable_irq_wake(palmas_usb->gpio_vbus_irq);
383 if (palmas_usb->enable_id_detection)
384 enable_irq_wake(palmas_usb->id_irq);
385 if (palmas_usb->enable_gpio_id_detection)
386 enable_irq_wake(palmas_usb->gpio_id_irq);
387 }
388 return 0;
389}
390
391static int palmas_usb_resume(struct device *dev)
392{
393 struct palmas_usb *palmas_usb = dev_get_drvdata(dev);
394
395 if (device_may_wakeup(dev)) {
396 if (palmas_usb->enable_vbus_detection)
397 disable_irq_wake(palmas_usb->vbus_irq);
398 if (palmas_usb->enable_gpio_vbus_detection)
399 disable_irq_wake(palmas_usb->gpio_vbus_irq);
400 if (palmas_usb->enable_id_detection)
401 disable_irq_wake(palmas_usb->id_irq);
402 if (palmas_usb->enable_gpio_id_detection)
403 disable_irq_wake(palmas_usb->gpio_id_irq);
404 }
405
406 /* check if GPIO states changed while suspend/resume */
407 if (palmas_usb->enable_gpio_vbus_detection)
408 palmas_vbus_irq_handler(palmas_usb->gpio_vbus_irq, palmas_usb);
409 palmas_gpio_id_detect(&palmas_usb->wq_detectid.work);
410
411 return 0;
412};
413#endif
414
415static SIMPLE_DEV_PM_OPS(palmas_pm_ops, palmas_usb_suspend, palmas_usb_resume);
416
417static const struct of_device_id of_palmas_match_tbl[] = {
418 { .compatible = "ti,palmas-usb", },
419 { .compatible = "ti,palmas-usb-vid", },
420 { .compatible = "ti,twl6035-usb", },
421 { .compatible = "ti,twl6035-usb-vid", },
422 { /* end */ }
423};
424
425static struct platform_driver palmas_usb_driver = {
426 .probe = palmas_usb_probe,
427 .remove = palmas_usb_remove,
428 .driver = {
429 .name = "palmas-usb",
430 .of_match_table = of_palmas_match_tbl,
431 .pm = &palmas_pm_ops,
432 },
433};
434
435module_platform_driver(palmas_usb_driver);
436
437MODULE_ALIAS("platform:palmas-usb");
438MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>");
439MODULE_DESCRIPTION("Palmas USB transceiver driver");
440MODULE_LICENSE("GPL");
441MODULE_DEVICE_TABLE(of, of_palmas_match_tbl);