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