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b1f254e3 GG |
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> | |
f63d32d4 | 26 | #include <linux/slab.h> |
b1f254e3 GG |
27 | #include <linux/err.h> |
28 | #include <linux/mfd/palmas.h> | |
29 | #include <linux/of.h> | |
30 | #include <linux/of_platform.h> | |
92b7cb5d | 31 | #include <linux/of_gpio.h> |
ac22a1d3 | 32 | #include <linux/gpio/consumer.h> |
92b7cb5d RQ |
33 | #include <linux/workqueue.h> |
34 | ||
35 | #define USB_GPIO_DEBOUNCE_MS 20 /* ms */ | |
b1f254e3 | 36 | |
73b6ecdb | 37 | static const unsigned int palmas_extcon_cable[] = { |
2a9de9c0 CC |
38 | EXTCON_USB, |
39 | EXTCON_USB_HOST, | |
40 | EXTCON_NONE, | |
b1f254e3 GG |
41 | }; |
42 | ||
b1f254e3 GG |
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 | ||
52 | static irqreturn_t palmas_vbus_irq_handler(int irq, void *_palmas_usb) | |
53 | { | |
54 | struct palmas_usb *palmas_usb = _palmas_usb; | |
2a9de9c0 | 55 | struct extcon_dev *edev = palmas_usb->edev; |
b1f254e3 GG |
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; | |
2a9de9c0 | 64 | extcon_set_cable_state_(edev, EXTCON_USB, true); |
002945f0 | 65 | dev_info(palmas_usb->dev, "USB cable is attached\n"); |
b1f254e3 GG |
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; | |
2a9de9c0 | 73 | extcon_set_cable_state_(edev, EXTCON_USB, false); |
002945f0 | 74 | dev_info(palmas_usb->dev, "USB cable is detached\n"); |
b1f254e3 GG |
75 | } else { |
76 | dev_dbg(palmas_usb->dev, | |
77 | "Spurious disconnect event detected\n"); | |
78 | } | |
79 | } | |
80 | ||
81 | return IRQ_HANDLED; | |
82 | } | |
83 | ||
84 | static irqreturn_t palmas_id_irq_handler(int irq, void *_palmas_usb) | |
85 | { | |
b7d2d5be | 86 | unsigned int set, id_src; |
b1f254e3 | 87 | struct palmas_usb *palmas_usb = _palmas_usb; |
2a9de9c0 | 88 | struct extcon_dev *edev = palmas_usb->edev; |
b1f254e3 GG |
89 | |
90 | palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE, | |
91 | PALMAS_USB_ID_INT_LATCH_SET, &set); | |
b7d2d5be GC |
92 | palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE, |
93 | PALMAS_USB_ID_INT_SRC, &id_src); | |
b1f254e3 | 94 | |
b7d2d5be GC |
95 | if ((set & PALMAS_USB_ID_INT_SRC_ID_GND) && |
96 | (id_src & PALMAS_USB_ID_INT_SRC_ID_GND)) { | |
b1f254e3 GG |
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; | |
2a9de9c0 | 101 | extcon_set_cable_state_(edev, EXTCON_USB_HOST, true); |
002945f0 | 102 | dev_info(palmas_usb->dev, "USB-HOST cable is attached\n"); |
b7d2d5be GC |
103 | } else if ((set & PALMAS_USB_ID_INT_SRC_ID_FLOAT) && |
104 | (id_src & PALMAS_USB_ID_INT_SRC_ID_FLOAT)) { | |
b1f254e3 GG |
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; | |
2a9de9c0 | 109 | extcon_set_cable_state_(edev, EXTCON_USB_HOST, false); |
002945f0 LD |
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; | |
2a9de9c0 | 114 | extcon_set_cable_state_(edev, EXTCON_USB_HOST, false); |
002945f0 | 115 | dev_info(palmas_usb->dev, "USB-HOST cable is detached\n"); |
b7d2d5be GC |
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; | |
2a9de9c0 | 119 | extcon_set_cable_state_(edev, EXTCON_USB_HOST, true); |
b7d2d5be | 120 | dev_info(palmas_usb->dev, " USB-HOST cable is attached\n"); |
b1f254e3 GG |
121 | } |
122 | ||
123 | return IRQ_HANDLED; | |
124 | } | |
125 | ||
92b7cb5d RQ |
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 | ||
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 | ||
b1f254e3 GG |
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 | ||
92b7cb5d RQ |
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); | |
b1f254e3 | 168 | |
92b7cb5d RQ |
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 | } | |
b1f254e3 | 174 | |
7281e05a LD |
175 | if (palmas_usb->enable_vbus_detection) |
176 | palmas_vbus_irq_handler(palmas_usb->vbus_irq, palmas_usb); | |
b1f254e3 GG |
177 | |
178 | /* cold plug for host mode needs this delay */ | |
7281e05a LD |
179 | if (palmas_usb->enable_id_detection) { |
180 | msleep(30); | |
181 | palmas_id_irq_handler(palmas_usb->id_irq, palmas_usb); | |
182 | } | |
b1f254e3 GG |
183 | } |
184 | ||
185 | static int palmas_usb_probe(struct platform_device *pdev) | |
186 | { | |
187 | struct palmas *palmas = dev_get_drvdata(pdev->dev.parent); | |
7c0f6558 | 188 | struct palmas_usb_platform_data *pdata = dev_get_platdata(&pdev->dev); |
b1f254e3 GG |
189 | struct device_node *node = pdev->dev.of_node; |
190 | struct palmas_usb *palmas_usb; | |
191 | int status; | |
192 | ||
b1f254e3 GG |
193 | palmas_usb = devm_kzalloc(&pdev->dev, sizeof(*palmas_usb), GFP_KERNEL); |
194 | if (!palmas_usb) | |
195 | return -ENOMEM; | |
196 | ||
7281e05a LD |
197 | if (node && !pdata) { |
198 | palmas_usb->wakeup = of_property_read_bool(node, "ti,wakeup"); | |
199 | palmas_usb->enable_id_detection = of_property_read_bool(node, | |
200 | "ti,enable-id-detection"); | |
201 | palmas_usb->enable_vbus_detection = of_property_read_bool(node, | |
202 | "ti,enable-vbus-detection"); | |
203 | } else { | |
204 | palmas_usb->wakeup = true; | |
205 | palmas_usb->enable_id_detection = true; | |
206 | palmas_usb->enable_vbus_detection = true; | |
207 | ||
208 | if (pdata) | |
209 | palmas_usb->wakeup = pdata->wakeup; | |
210 | } | |
211 | ||
ac22a1d3 CC |
212 | palmas_usb->id_gpiod = devm_gpiod_get_optional(&pdev->dev, "id", |
213 | GPIOD_IN); | |
92b7cb5d RQ |
214 | if (IS_ERR(palmas_usb->id_gpiod)) { |
215 | dev_err(&pdev->dev, "failed to get id gpio\n"); | |
216 | return PTR_ERR(palmas_usb->id_gpiod); | |
217 | } | |
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_gpio_id_detection) { | |
225 | u32 debounce; | |
226 | ||
227 | if (of_property_read_u32(node, "debounce-delay-ms", &debounce)) | |
228 | debounce = USB_GPIO_DEBOUNCE_MS; | |
229 | ||
230 | status = gpiod_set_debounce(palmas_usb->id_gpiod, | |
231 | debounce * 1000); | |
232 | if (status < 0) | |
233 | palmas_usb->sw_debounce_jiffies = msecs_to_jiffies(debounce); | |
234 | } | |
235 | ||
236 | INIT_DELAYED_WORK(&palmas_usb->wq_detectid, palmas_gpio_id_detect); | |
237 | ||
b1f254e3 GG |
238 | palmas->usb = palmas_usb; |
239 | palmas_usb->palmas = palmas; | |
240 | ||
241 | palmas_usb->dev = &pdev->dev; | |
242 | ||
7281e05a | 243 | palmas_usb_wakeup(palmas, palmas_usb->wakeup); |
b1f254e3 GG |
244 | |
245 | platform_set_drvdata(pdev, palmas_usb); | |
246 | ||
3f79a3fb CC |
247 | palmas_usb->edev = devm_extcon_dev_allocate(&pdev->dev, |
248 | palmas_extcon_cable); | |
249 | if (IS_ERR(palmas_usb->edev)) { | |
250 | dev_err(&pdev->dev, "failed to allocate extcon device\n"); | |
251 | return -ENOMEM; | |
252 | } | |
b1f254e3 | 253 | |
3f79a3fb | 254 | status = devm_extcon_dev_register(&pdev->dev, palmas_usb->edev); |
b1f254e3 GG |
255 | if (status) { |
256 | dev_err(&pdev->dev, "failed to register extcon device\n"); | |
257 | return status; | |
258 | } | |
259 | ||
7281e05a | 260 | if (palmas_usb->enable_id_detection) { |
92b7cb5d RQ |
261 | palmas_usb->id_otg_irq = regmap_irq_get_virq(palmas->irq_data, |
262 | PALMAS_ID_OTG_IRQ); | |
263 | palmas_usb->id_irq = regmap_irq_get_virq(palmas->irq_data, | |
264 | PALMAS_ID_IRQ); | |
7281e05a LD |
265 | status = devm_request_threaded_irq(palmas_usb->dev, |
266 | palmas_usb->id_irq, | |
267 | NULL, palmas_id_irq_handler, | |
268 | IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | | |
269 | IRQF_ONESHOT | IRQF_EARLY_RESUME, | |
270 | "palmas_usb_id", palmas_usb); | |
271 | if (status < 0) { | |
272 | dev_err(&pdev->dev, "can't get IRQ %d, err %d\n", | |
b1f254e3 | 273 | palmas_usb->id_irq, status); |
b4dad55a | 274 | return status; |
7281e05a | 275 | } |
92b7cb5d RQ |
276 | } else if (palmas_usb->enable_gpio_id_detection) { |
277 | palmas_usb->gpio_id_irq = gpiod_to_irq(palmas_usb->id_gpiod); | |
278 | if (palmas_usb->gpio_id_irq < 0) { | |
279 | dev_err(&pdev->dev, "failed to get id irq\n"); | |
280 | return palmas_usb->gpio_id_irq; | |
281 | } | |
282 | status = devm_request_threaded_irq(&pdev->dev, | |
283 | palmas_usb->gpio_id_irq, | |
284 | NULL, | |
285 | palmas_gpio_id_irq_handler, | |
286 | IRQF_TRIGGER_RISING | | |
287 | IRQF_TRIGGER_FALLING | | |
288 | IRQF_ONESHOT, | |
289 | "palmas_usb_id", | |
290 | palmas_usb); | |
291 | if (status < 0) { | |
292 | dev_err(&pdev->dev, | |
293 | "failed to request handler for id irq\n"); | |
294 | return status; | |
295 | } | |
b1f254e3 GG |
296 | } |
297 | ||
7281e05a | 298 | if (palmas_usb->enable_vbus_detection) { |
92b7cb5d RQ |
299 | palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data, |
300 | PALMAS_VBUS_OTG_IRQ); | |
301 | palmas_usb->vbus_irq = regmap_irq_get_virq(palmas->irq_data, | |
302 | PALMAS_VBUS_IRQ); | |
7281e05a LD |
303 | status = devm_request_threaded_irq(palmas_usb->dev, |
304 | palmas_usb->vbus_irq, NULL, | |
305 | palmas_vbus_irq_handler, | |
306 | IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | | |
307 | IRQF_ONESHOT | IRQF_EARLY_RESUME, | |
308 | "palmas_usb_vbus", palmas_usb); | |
309 | if (status < 0) { | |
310 | dev_err(&pdev->dev, "can't get IRQ %d, err %d\n", | |
b1f254e3 | 311 | palmas_usb->vbus_irq, status); |
b4dad55a | 312 | return status; |
7281e05a | 313 | } |
b1f254e3 GG |
314 | } |
315 | ||
316 | palmas_enable_irq(palmas_usb); | |
92b7cb5d RQ |
317 | /* perform initial detection */ |
318 | palmas_gpio_id_detect(&palmas_usb->wq_detectid.work); | |
024783ef | 319 | device_set_wakeup_capable(&pdev->dev, true); |
b1f254e3 | 320 | return 0; |
b1f254e3 GG |
321 | } |
322 | ||
92b7cb5d RQ |
323 | static int palmas_usb_remove(struct platform_device *pdev) |
324 | { | |
325 | struct palmas_usb *palmas_usb = platform_get_drvdata(pdev); | |
326 | ||
327 | cancel_delayed_work_sync(&palmas_usb->wq_detectid); | |
328 | ||
329 | return 0; | |
330 | } | |
331 | ||
024783ef LD |
332 | #ifdef CONFIG_PM_SLEEP |
333 | static int palmas_usb_suspend(struct device *dev) | |
334 | { | |
335 | struct palmas_usb *palmas_usb = dev_get_drvdata(dev); | |
336 | ||
337 | if (device_may_wakeup(dev)) { | |
7281e05a LD |
338 | if (palmas_usb->enable_vbus_detection) |
339 | enable_irq_wake(palmas_usb->vbus_irq); | |
340 | if (palmas_usb->enable_id_detection) | |
341 | enable_irq_wake(palmas_usb->id_irq); | |
92b7cb5d RQ |
342 | if (palmas_usb->enable_gpio_id_detection) |
343 | enable_irq_wake(palmas_usb->gpio_id_irq); | |
024783ef LD |
344 | } |
345 | return 0; | |
346 | } | |
347 | ||
348 | static int palmas_usb_resume(struct device *dev) | |
349 | { | |
350 | struct palmas_usb *palmas_usb = dev_get_drvdata(dev); | |
351 | ||
352 | if (device_may_wakeup(dev)) { | |
7281e05a LD |
353 | if (palmas_usb->enable_vbus_detection) |
354 | disable_irq_wake(palmas_usb->vbus_irq); | |
355 | if (palmas_usb->enable_id_detection) | |
356 | disable_irq_wake(palmas_usb->id_irq); | |
92b7cb5d RQ |
357 | if (palmas_usb->enable_gpio_id_detection) |
358 | disable_irq_wake(palmas_usb->gpio_id_irq); | |
024783ef LD |
359 | } |
360 | return 0; | |
361 | }; | |
362 | #endif | |
363 | ||
8d4288fb | 364 | static SIMPLE_DEV_PM_OPS(palmas_pm_ops, palmas_usb_suspend, palmas_usb_resume); |
024783ef | 365 | |
3bc2ac7d | 366 | static const struct of_device_id of_palmas_match_tbl[] = { |
b1f254e3 | 367 | { .compatible = "ti,palmas-usb", }, |
5fbc77d6 | 368 | { .compatible = "ti,palmas-usb-vid", }, |
b1f254e3 | 369 | { .compatible = "ti,twl6035-usb", }, |
5fbc77d6 | 370 | { .compatible = "ti,twl6035-usb-vid", }, |
b1f254e3 GG |
371 | { /* end */ } |
372 | }; | |
373 | ||
374 | static struct platform_driver palmas_usb_driver = { | |
375 | .probe = palmas_usb_probe, | |
92b7cb5d | 376 | .remove = palmas_usb_remove, |
b1f254e3 GG |
377 | .driver = { |
378 | .name = "palmas-usb", | |
379 | .of_match_table = of_palmas_match_tbl, | |
024783ef | 380 | .pm = &palmas_pm_ops, |
b1f254e3 GG |
381 | }, |
382 | }; | |
383 | ||
384 | module_platform_driver(palmas_usb_driver); | |
385 | ||
386 | MODULE_ALIAS("platform:palmas-usb"); | |
387 | MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>"); | |
388 | MODULE_DESCRIPTION("Palmas USB transceiver driver"); | |
389 | MODULE_LICENSE("GPL"); | |
390 | MODULE_DEVICE_TABLE(of, of_palmas_match_tbl); |