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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/err.h>
 27 #include <linux/mfd/palmas.h>
 28 #include <linux/of.h>
 29 #include <linux/of_platform.h>
 30 
 31 static const char *palmas_extcon_cable[] = {
 32         [0] = "USB",
 33         [1] = "USB-HOST",
 34         NULL,
 35 };
 36 
 37 static const int mutually_exclusive[] = {0x3, 0x0};
 38 
 39 static void palmas_usb_wakeup(struct palmas *palmas, int enable)
 40 {
 41         if (enable)
 42                 palmas_write(palmas, PALMAS_USB_OTG_BASE, PALMAS_USB_WAKEUP,
 43                         PALMAS_USB_WAKEUP_ID_WK_UP_COMP);
 44         else
 45                 palmas_write(palmas, PALMAS_USB_OTG_BASE, PALMAS_USB_WAKEUP, 0);
 46 }
 47 
 48 static irqreturn_t palmas_vbus_irq_handler(int irq, void *_palmas_usb)
 49 {
 50         struct palmas_usb *palmas_usb = _palmas_usb;
 51         unsigned int vbus_line_state;
 52 
 53         palmas_read(palmas_usb->palmas, PALMAS_INTERRUPT_BASE,
 54                 PALMAS_INT3_LINE_STATE, &vbus_line_state);
 55 
 56         if (vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS) {
 57                 if (palmas_usb->linkstat != PALMAS_USB_STATE_VBUS) {
 58                         palmas_usb->linkstat = PALMAS_USB_STATE_VBUS;
 59                         extcon_set_cable_state(&palmas_usb->edev, "USB", true);
 60                         dev_info(palmas_usb->dev, "USB cable is attached\n");
 61                 } else {
 62                         dev_dbg(palmas_usb->dev,
 63                                 "Spurious connect event detected\n");
 64                 }
 65         } else if (!(vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS)) {
 66                 if (palmas_usb->linkstat == PALMAS_USB_STATE_VBUS) {
 67                         palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
 68                         extcon_set_cable_state(&palmas_usb->edev, "USB", false);
 69                         dev_info(palmas_usb->dev, "USB cable is detached\n");
 70                 } else {
 71                         dev_dbg(palmas_usb->dev,
 72                                 "Spurious disconnect event detected\n");
 73                 }
 74         }
 75 
 76         return IRQ_HANDLED;
 77 }
 78 
 79 static irqreturn_t palmas_id_irq_handler(int irq, void *_palmas_usb)
 80 {
 81         unsigned int set, id_src;
 82         struct palmas_usb *palmas_usb = _palmas_usb;
 83 
 84         palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
 85                 PALMAS_USB_ID_INT_LATCH_SET, &set);
 86         palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
 87                 PALMAS_USB_ID_INT_SRC, &id_src);
 88 
 89         if ((set & PALMAS_USB_ID_INT_SRC_ID_GND) &&
 90                                 (id_src & PALMAS_USB_ID_INT_SRC_ID_GND)) {
 91                 palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
 92                         PALMAS_USB_ID_INT_LATCH_CLR,
 93                         PALMAS_USB_ID_INT_EN_HI_CLR_ID_GND);
 94                 palmas_usb->linkstat = PALMAS_USB_STATE_ID;
 95                 extcon_set_cable_state(&palmas_usb->edev, "USB-HOST", true);
 96                 dev_info(palmas_usb->dev, "USB-HOST cable is attached\n");
 97         } else if ((set & PALMAS_USB_ID_INT_SRC_ID_FLOAT) &&
 98                                 (id_src & PALMAS_USB_ID_INT_SRC_ID_FLOAT)) {
 99                 palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
100                         PALMAS_USB_ID_INT_LATCH_CLR,
101                         PALMAS_USB_ID_INT_EN_HI_CLR_ID_FLOAT);
102                 palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
103                 extcon_set_cable_state(&palmas_usb->edev, "USB-HOST", false);
104                 dev_info(palmas_usb->dev, "USB-HOST cable is detached\n");
105         } else if ((palmas_usb->linkstat == PALMAS_USB_STATE_ID) &&
106                                 (!(set & PALMAS_USB_ID_INT_SRC_ID_GND))) {
107                 palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
108                 extcon_set_cable_state(&palmas_usb->edev, "USB-HOST", false);
109                 dev_info(palmas_usb->dev, "USB-HOST cable is detached\n");
110         } else if ((palmas_usb->linkstat == PALMAS_USB_STATE_DISCONNECT) &&
111                                 (id_src & PALMAS_USB_ID_INT_SRC_ID_GND)) {
112                 palmas_usb->linkstat = PALMAS_USB_STATE_ID;
113                 extcon_set_cable_state(&palmas_usb->edev, "USB-HOST", true);
114                 dev_info(palmas_usb->dev, " USB-HOST cable is attached\n");
115         }
116 
117         return IRQ_HANDLED;
118 }
119 
120 static void palmas_enable_irq(struct palmas_usb *palmas_usb)
121 {
122         palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
123                 PALMAS_USB_VBUS_CTRL_SET,
124                 PALMAS_USB_VBUS_CTRL_SET_VBUS_ACT_COMP);
125 
126         palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
127                 PALMAS_USB_ID_CTRL_SET, PALMAS_USB_ID_CTRL_SET_ID_ACT_COMP);
128 
129         palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
130                 PALMAS_USB_ID_INT_EN_HI_SET,
131                 PALMAS_USB_ID_INT_EN_HI_SET_ID_GND |
132                 PALMAS_USB_ID_INT_EN_HI_SET_ID_FLOAT);
133 
134         if (palmas_usb->enable_vbus_detection)
135                 palmas_vbus_irq_handler(palmas_usb->vbus_irq, palmas_usb);
136 
137         /* cold plug for host mode needs this delay */
138         if (palmas_usb->enable_id_detection) {
139                 msleep(30);
140                 palmas_id_irq_handler(palmas_usb->id_irq, palmas_usb);
141         }
142 }
143 
144 static int palmas_usb_probe(struct platform_device *pdev)
145 {
146         struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);
147         struct palmas_usb_platform_data *pdata = dev_get_platdata(&pdev->dev);
148         struct device_node *node = pdev->dev.of_node;
149         struct palmas_usb *palmas_usb;
150         int status;
151 
152         palmas_usb = devm_kzalloc(&pdev->dev, sizeof(*palmas_usb), GFP_KERNEL);
153         if (!palmas_usb)
154                 return -ENOMEM;
155 
156         if (node && !pdata) {
157                 palmas_usb->wakeup = of_property_read_bool(node, "ti,wakeup");
158                 palmas_usb->enable_id_detection = of_property_read_bool(node,
159                                                 "ti,enable-id-detection");
160                 palmas_usb->enable_vbus_detection = of_property_read_bool(node,
161                                                 "ti,enable-vbus-detection");
162         } else {
163                 palmas_usb->wakeup = true;
164                 palmas_usb->enable_id_detection = true;
165                 palmas_usb->enable_vbus_detection = true;
166 
167                 if (pdata)
168                         palmas_usb->wakeup = pdata->wakeup;
169         }
170 
171         palmas->usb = palmas_usb;
172         palmas_usb->palmas = palmas;
173 
174         palmas_usb->dev  = &pdev->dev;
175 
176         palmas_usb->id_otg_irq = regmap_irq_get_virq(palmas->irq_data,
177                                                 PALMAS_ID_OTG_IRQ);
178         palmas_usb->id_irq = regmap_irq_get_virq(palmas->irq_data,
179                                                 PALMAS_ID_IRQ);
180         palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data,
181                                                 PALMAS_VBUS_OTG_IRQ);
182         palmas_usb->vbus_irq = regmap_irq_get_virq(palmas->irq_data,
183                                                 PALMAS_VBUS_IRQ);
184 
185         palmas_usb_wakeup(palmas, palmas_usb->wakeup);
186 
187         platform_set_drvdata(pdev, palmas_usb);
188 
189         palmas_usb->edev.supported_cable = palmas_extcon_cable;
190         palmas_usb->edev.dev.parent = palmas_usb->dev;
191         palmas_usb->edev.mutually_exclusive = mutually_exclusive;
192 
193         status = extcon_dev_register(&palmas_usb->edev);
194         if (status) {
195                 dev_err(&pdev->dev, "failed to register extcon device\n");
196                 return status;
197         }
198 
199         if (palmas_usb->enable_id_detection) {
200                 status = devm_request_threaded_irq(palmas_usb->dev,
201                                 palmas_usb->id_irq,
202                                 NULL, palmas_id_irq_handler,
203                                 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
204                                 IRQF_ONESHOT | IRQF_EARLY_RESUME,
205                                 "palmas_usb_id", palmas_usb);
206                 if (status < 0) {
207                         dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
208                                         palmas_usb->id_irq, status);
209                         goto fail_extcon;
210                 }
211         }
212 
213         if (palmas_usb->enable_vbus_detection) {
214                 status = devm_request_threaded_irq(palmas_usb->dev,
215                                 palmas_usb->vbus_irq, NULL,
216                                 palmas_vbus_irq_handler,
217                                 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
218                                 IRQF_ONESHOT | IRQF_EARLY_RESUME,
219                                 "palmas_usb_vbus", palmas_usb);
220                 if (status < 0) {
221                         dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
222                                         palmas_usb->vbus_irq, status);
223                         goto fail_extcon;
224                 }
225         }
226 
227         palmas_enable_irq(palmas_usb);
228         device_set_wakeup_capable(&pdev->dev, true);
229         return 0;
230 
231 fail_extcon:
232         extcon_dev_unregister(&palmas_usb->edev);
233 
234         return status;
235 }
236 
237 static int palmas_usb_remove(struct platform_device *pdev)
238 {
239         struct palmas_usb *palmas_usb = platform_get_drvdata(pdev);
240 
241         extcon_dev_unregister(&palmas_usb->edev);
242 
243         return 0;
244 }
245 
246 #ifdef CONFIG_PM_SLEEP
247 static int palmas_usb_suspend(struct device *dev)
248 {
249         struct palmas_usb *palmas_usb = dev_get_drvdata(dev);
250 
251         if (device_may_wakeup(dev)) {
252                 if (palmas_usb->enable_vbus_detection)
253                         enable_irq_wake(palmas_usb->vbus_irq);
254                 if (palmas_usb->enable_id_detection)
255                         enable_irq_wake(palmas_usb->id_irq);
256         }
257         return 0;
258 }
259 
260 static int palmas_usb_resume(struct device *dev)
261 {
262         struct palmas_usb *palmas_usb = dev_get_drvdata(dev);
263 
264         if (device_may_wakeup(dev)) {
265                 if (palmas_usb->enable_vbus_detection)
266                         disable_irq_wake(palmas_usb->vbus_irq);
267                 if (palmas_usb->enable_id_detection)
268                         disable_irq_wake(palmas_usb->id_irq);
269         }
270         return 0;
271 };
272 #endif
273 
274 static const struct dev_pm_ops palmas_pm_ops = {
275         SET_SYSTEM_SLEEP_PM_OPS(palmas_usb_suspend,
276                                 palmas_usb_resume)
277 };
278 
279 static struct of_device_id of_palmas_match_tbl[] = {
280         { .compatible = "ti,palmas-usb", },
281         { .compatible = "ti,palmas-usb-vid", },
282         { .compatible = "ti,twl6035-usb", },
283         { .compatible = "ti,twl6035-usb-vid", },
284         { /* end */ }
285 };
286 
287 static struct platform_driver palmas_usb_driver = {
288         .probe = palmas_usb_probe,
289         .remove = palmas_usb_remove,
290         .driver = {
291                 .name = "palmas-usb",
292                 .of_match_table = of_palmas_match_tbl,
293                 .owner = THIS_MODULE,
294                 .pm = &palmas_pm_ops,
295         },
296 };
297 
298 module_platform_driver(palmas_usb_driver);
299 
300 MODULE_ALIAS("platform:palmas-usb");
301 MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>");
302 MODULE_DESCRIPTION("Palmas USB transceiver driver");
303 MODULE_LICENSE("GPL");
304 MODULE_DEVICE_TABLE(of, of_palmas_match_tbl);
305 

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