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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 - 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);