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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 
 32 static const unsigned int palmas_extcon_cable[] = {
 33         EXTCON_USB,
 34         EXTCON_USB_HOST,
 35         EXTCON_NONE,
 36 };
 37 
 38 static const int mutually_exclusive[] = {0x3, 0x0};
 39 
 40 static void palmas_usb_wakeup(struct palmas *palmas, int enable)
 41 {
 42         if (enable)
 43                 palmas_write(palmas, PALMAS_USB_OTG_BASE, PALMAS_USB_WAKEUP,
 44                         PALMAS_USB_WAKEUP_ID_WK_UP_COMP);
 45         else
 46                 palmas_write(palmas, PALMAS_USB_OTG_BASE, PALMAS_USB_WAKEUP, 0);
 47 }
 48 
 49 static irqreturn_t palmas_vbus_irq_handler(int irq, void *_palmas_usb)
 50 {
 51         struct palmas_usb *palmas_usb = _palmas_usb;
 52         struct extcon_dev *edev = palmas_usb->edev;
 53         unsigned int vbus_line_state;
 54 
 55         palmas_read(palmas_usb->palmas, PALMAS_INTERRUPT_BASE,
 56                 PALMAS_INT3_LINE_STATE, &vbus_line_state);
 57 
 58         if (vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS) {
 59                 if (palmas_usb->linkstat != PALMAS_USB_STATE_VBUS) {
 60                         palmas_usb->linkstat = PALMAS_USB_STATE_VBUS;
 61                         extcon_set_cable_state_(edev, EXTCON_USB, true);
 62                         dev_info(palmas_usb->dev, "USB cable is attached\n");
 63                 } else {
 64                         dev_dbg(palmas_usb->dev,
 65                                 "Spurious connect event detected\n");
 66                 }
 67         } else if (!(vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS)) {
 68                 if (palmas_usb->linkstat == PALMAS_USB_STATE_VBUS) {
 69                         palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
 70                         extcon_set_cable_state_(edev, EXTCON_USB, false);
 71                         dev_info(palmas_usb->dev, "USB cable is detached\n");
 72                 } else {
 73                         dev_dbg(palmas_usb->dev,
 74                                 "Spurious disconnect event detected\n");
 75                 }
 76         }
 77 
 78         return IRQ_HANDLED;
 79 }
 80 
 81 static irqreturn_t palmas_id_irq_handler(int irq, void *_palmas_usb)
 82 {
 83         unsigned int set, id_src;
 84         struct palmas_usb *palmas_usb = _palmas_usb;
 85         struct extcon_dev *edev = palmas_usb->edev;
 86 
 87         palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
 88                 PALMAS_USB_ID_INT_LATCH_SET, &set);
 89         palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
 90                 PALMAS_USB_ID_INT_SRC, &id_src);
 91 
 92         if ((set & PALMAS_USB_ID_INT_SRC_ID_GND) &&
 93                                 (id_src & PALMAS_USB_ID_INT_SRC_ID_GND)) {
 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_GND);
 97                 palmas_usb->linkstat = PALMAS_USB_STATE_ID;
 98                 extcon_set_cable_state_(edev, EXTCON_USB_HOST, true);
 99                 dev_info(palmas_usb->dev, "USB-HOST cable is attached\n");
100         } else if ((set & PALMAS_USB_ID_INT_SRC_ID_FLOAT) &&
101                                 (id_src & PALMAS_USB_ID_INT_SRC_ID_FLOAT)) {
102                 palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
103                         PALMAS_USB_ID_INT_LATCH_CLR,
104                         PALMAS_USB_ID_INT_EN_HI_CLR_ID_FLOAT);
105                 palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
106                 extcon_set_cable_state_(edev, EXTCON_USB_HOST, false);
107                 dev_info(palmas_usb->dev, "USB-HOST cable is detached\n");
108         } else if ((palmas_usb->linkstat == PALMAS_USB_STATE_ID) &&
109                                 (!(set & PALMAS_USB_ID_INT_SRC_ID_GND))) {
110                 palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
111                 extcon_set_cable_state_(edev, EXTCON_USB_HOST, false);
112                 dev_info(palmas_usb->dev, "USB-HOST cable is detached\n");
113         } else if ((palmas_usb->linkstat == PALMAS_USB_STATE_DISCONNECT) &&
114                                 (id_src & PALMAS_USB_ID_INT_SRC_ID_GND)) {
115                 palmas_usb->linkstat = PALMAS_USB_STATE_ID;
116                 extcon_set_cable_state_(edev, EXTCON_USB_HOST, true);
117                 dev_info(palmas_usb->dev, " USB-HOST cable is attached\n");
118         }
119 
120         return IRQ_HANDLED;
121 }
122 
123 static void palmas_enable_irq(struct palmas_usb *palmas_usb)
124 {
125         palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
126                 PALMAS_USB_VBUS_CTRL_SET,
127                 PALMAS_USB_VBUS_CTRL_SET_VBUS_ACT_COMP);
128 
129         palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
130                 PALMAS_USB_ID_CTRL_SET, PALMAS_USB_ID_CTRL_SET_ID_ACT_COMP);
131 
132         palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
133                 PALMAS_USB_ID_INT_EN_HI_SET,
134                 PALMAS_USB_ID_INT_EN_HI_SET_ID_GND |
135                 PALMAS_USB_ID_INT_EN_HI_SET_ID_FLOAT);
136 
137         if (palmas_usb->enable_vbus_detection)
138                 palmas_vbus_irq_handler(palmas_usb->vbus_irq, palmas_usb);
139 
140         /* cold plug for host mode needs this delay */
141         if (palmas_usb->enable_id_detection) {
142                 msleep(30);
143                 palmas_id_irq_handler(palmas_usb->id_irq, palmas_usb);
144         }
145 }
146 
147 static int palmas_usb_probe(struct platform_device *pdev)
148 {
149         struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);
150         struct palmas_usb_platform_data *pdata = dev_get_platdata(&pdev->dev);
151         struct device_node *node = pdev->dev.of_node;
152         struct palmas_usb *palmas_usb;
153         int status;
154 
155         palmas_usb = devm_kzalloc(&pdev->dev, sizeof(*palmas_usb), GFP_KERNEL);
156         if (!palmas_usb)
157                 return -ENOMEM;
158 
159         if (node && !pdata) {
160                 palmas_usb->wakeup = of_property_read_bool(node, "ti,wakeup");
161                 palmas_usb->enable_id_detection = of_property_read_bool(node,
162                                                 "ti,enable-id-detection");
163                 palmas_usb->enable_vbus_detection = of_property_read_bool(node,
164                                                 "ti,enable-vbus-detection");
165         } else {
166                 palmas_usb->wakeup = true;
167                 palmas_usb->enable_id_detection = true;
168                 palmas_usb->enable_vbus_detection = true;
169 
170                 if (pdata)
171                         palmas_usb->wakeup = pdata->wakeup;
172         }
173 
174         palmas->usb = palmas_usb;
175         palmas_usb->palmas = palmas;
176 
177         palmas_usb->dev  = &pdev->dev;
178 
179         palmas_usb->id_otg_irq = regmap_irq_get_virq(palmas->irq_data,
180                                                 PALMAS_ID_OTG_IRQ);
181         palmas_usb->id_irq = regmap_irq_get_virq(palmas->irq_data,
182                                                 PALMAS_ID_IRQ);
183         palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data,
184                                                 PALMAS_VBUS_OTG_IRQ);
185         palmas_usb->vbus_irq = regmap_irq_get_virq(palmas->irq_data,
186                                                 PALMAS_VBUS_IRQ);
187 
188         palmas_usb_wakeup(palmas, palmas_usb->wakeup);
189 
190         platform_set_drvdata(pdev, palmas_usb);
191 
192         palmas_usb->edev = devm_extcon_dev_allocate(&pdev->dev,
193                                                     palmas_extcon_cable);
194         if (IS_ERR(palmas_usb->edev)) {
195                 dev_err(&pdev->dev, "failed to allocate extcon device\n");
196                 return -ENOMEM;
197         }
198         palmas_usb->edev->mutually_exclusive = mutually_exclusive;
199 
200         status = devm_extcon_dev_register(&pdev->dev, palmas_usb->edev);
201         if (status) {
202                 dev_err(&pdev->dev, "failed to register extcon device\n");
203                 return status;
204         }
205 
206         if (palmas_usb->enable_id_detection) {
207                 status = devm_request_threaded_irq(palmas_usb->dev,
208                                 palmas_usb->id_irq,
209                                 NULL, palmas_id_irq_handler,
210                                 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
211                                 IRQF_ONESHOT | IRQF_EARLY_RESUME,
212                                 "palmas_usb_id", palmas_usb);
213                 if (status < 0) {
214                         dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
215                                         palmas_usb->id_irq, status);
216                         return status;
217                 }
218         }
219 
220         if (palmas_usb->enable_vbus_detection) {
221                 status = devm_request_threaded_irq(palmas_usb->dev,
222                                 palmas_usb->vbus_irq, NULL,
223                                 palmas_vbus_irq_handler,
224                                 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
225                                 IRQF_ONESHOT | IRQF_EARLY_RESUME,
226                                 "palmas_usb_vbus", palmas_usb);
227                 if (status < 0) {
228                         dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
229                                         palmas_usb->vbus_irq, status);
230                         return status;
231                 }
232         }
233 
234         palmas_enable_irq(palmas_usb);
235         device_set_wakeup_capable(&pdev->dev, true);
236         return 0;
237 }
238 
239 #ifdef CONFIG_PM_SLEEP
240 static int palmas_usb_suspend(struct device *dev)
241 {
242         struct palmas_usb *palmas_usb = dev_get_drvdata(dev);
243 
244         if (device_may_wakeup(dev)) {
245                 if (palmas_usb->enable_vbus_detection)
246                         enable_irq_wake(palmas_usb->vbus_irq);
247                 if (palmas_usb->enable_id_detection)
248                         enable_irq_wake(palmas_usb->id_irq);
249         }
250         return 0;
251 }
252 
253 static int palmas_usb_resume(struct device *dev)
254 {
255         struct palmas_usb *palmas_usb = dev_get_drvdata(dev);
256 
257         if (device_may_wakeup(dev)) {
258                 if (palmas_usb->enable_vbus_detection)
259                         disable_irq_wake(palmas_usb->vbus_irq);
260                 if (palmas_usb->enable_id_detection)
261                         disable_irq_wake(palmas_usb->id_irq);
262         }
263         return 0;
264 };
265 #endif
266 
267 static SIMPLE_DEV_PM_OPS(palmas_pm_ops, palmas_usb_suspend, palmas_usb_resume);
268 
269 static const struct of_device_id of_palmas_match_tbl[] = {
270         { .compatible = "ti,palmas-usb", },
271         { .compatible = "ti,palmas-usb-vid", },
272         { .compatible = "ti,twl6035-usb", },
273         { .compatible = "ti,twl6035-usb-vid", },
274         { /* end */ }
275 };
276 
277 static struct platform_driver palmas_usb_driver = {
278         .probe = palmas_usb_probe,
279         .driver = {
280                 .name = "palmas-usb",
281                 .of_match_table = of_palmas_match_tbl,
282                 .pm = &palmas_pm_ops,
283         },
284 };
285 
286 module_platform_driver(palmas_usb_driver);
287 
288 MODULE_ALIAS("platform:palmas-usb");
289 MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>");
290 MODULE_DESCRIPTION("Palmas USB transceiver driver");
291 MODULE_LICENSE("GPL");
292 MODULE_DEVICE_TABLE(of, of_palmas_match_tbl);
293 

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