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Linux/drivers/extcon/extcon-palmas.c

  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 
 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;
 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 
 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 
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 
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 
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         palmas_usb = devm_kzalloc(&pdev->dev, sizeof(*palmas_usb), GFP_KERNEL);
194         if (!palmas_usb)
195                 return -ENOMEM;
196 
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 
212         palmas_usb->id_gpiod = devm_gpiod_get_optional(&pdev->dev, "id",
213                                                         GPIOD_IN);
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 
238         palmas->usb = palmas_usb;
239         palmas_usb->palmas = palmas;
240 
241         palmas_usb->dev  = &pdev->dev;
242 
243         palmas_usb_wakeup(palmas, palmas_usb->wakeup);
244 
245         platform_set_drvdata(pdev, palmas_usb);
246 
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         }
253 
254         status = devm_extcon_dev_register(&pdev->dev, palmas_usb->edev);
255         if (status) {
256                 dev_err(&pdev->dev, "failed to register extcon device\n");
257                 return status;
258         }
259 
260         if (palmas_usb->enable_id_detection) {
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);
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",
273                                         palmas_usb->id_irq, status);
274                         return status;
275                 }
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                 }
296         }
297 
298         if (palmas_usb->enable_vbus_detection) {
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);
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",
311                                         palmas_usb->vbus_irq, status);
312                         return status;
313                 }
314         }
315 
316         palmas_enable_irq(palmas_usb);
317         /* perform initial detection */
318         palmas_gpio_id_detect(&palmas_usb->wq_detectid.work);
319         device_set_wakeup_capable(&pdev->dev, true);
320         return 0;
321 }
322 
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 
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)) {
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);
342                 if (palmas_usb->enable_gpio_id_detection)
343                         enable_irq_wake(palmas_usb->gpio_id_irq);
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)) {
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);
357                 if (palmas_usb->enable_gpio_id_detection)
358                         disable_irq_wake(palmas_usb->gpio_id_irq);
359         }
360         return 0;
361 };
362 #endif
363 
364 static SIMPLE_DEV_PM_OPS(palmas_pm_ops, palmas_usb_suspend, palmas_usb_resume);
365 
366 static const struct of_device_id of_palmas_match_tbl[] = {
367         { .compatible = "ti,palmas-usb", },
368         { .compatible = "ti,palmas-usb-vid", },
369         { .compatible = "ti,twl6035-usb", },
370         { .compatible = "ti,twl6035-usb-vid", },
371         { /* end */ }
372 };
373 
374 static struct platform_driver palmas_usb_driver = {
375         .probe = palmas_usb_probe,
376         .remove = palmas_usb_remove,
377         .driver = {
378                 .name = "palmas-usb",
379                 .of_match_table = of_palmas_match_tbl,
380                 .pm = &palmas_pm_ops,
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);
391 

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