blob: 89fdd05c5fd61a39cb75f7c9488f261a9e04412a [file] [log] [blame]
Graeme Gregoryb1f254e2013-05-28 10:50:11 +09001/*
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
31static const char *palmas_extcon_cable[] = {
32 [0] = "USB",
33 [1] = "USB-HOST",
34 NULL,
35};
36
37static const int mutually_exclusive[] = {0x3, 0x0};
38
39static 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
48static 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);
Laxman Dewangan002945f2013-07-09 18:34:22 +053060 dev_info(palmas_usb->dev, "USB cable is attached\n");
Graeme Gregoryb1f254e2013-05-28 10:50:11 +090061 } 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);
Laxman Dewangan002945f2013-07-09 18:34:22 +053069 dev_info(palmas_usb->dev, "USB cable is detached\n");
Graeme Gregoryb1f254e2013-05-28 10:50:11 +090070 } else {
71 dev_dbg(palmas_usb->dev,
72 "Spurious disconnect event detected\n");
73 }
74 }
75
76 return IRQ_HANDLED;
77}
78
79static irqreturn_t palmas_id_irq_handler(int irq, void *_palmas_usb)
80{
81 unsigned int set;
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
87 if (set & PALMAS_USB_ID_INT_SRC_ID_GND) {
88 palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
Graeme Gregoryb1f254e2013-05-28 10:50:11 +090089 PALMAS_USB_ID_INT_LATCH_CLR,
90 PALMAS_USB_ID_INT_EN_HI_CLR_ID_GND);
91 palmas_usb->linkstat = PALMAS_USB_STATE_ID;
92 extcon_set_cable_state(&palmas_usb->edev, "USB-HOST", true);
Laxman Dewangan002945f2013-07-09 18:34:22 +053093 dev_info(palmas_usb->dev, "USB-HOST cable is attached\n");
Graeme Gregoryb1f254e2013-05-28 10:50:11 +090094 } else if (set & PALMAS_USB_ID_INT_SRC_ID_FLOAT) {
95 palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
Graeme Gregoryb1f254e2013-05-28 10:50:11 +090096 PALMAS_USB_ID_INT_LATCH_CLR,
97 PALMAS_USB_ID_INT_EN_HI_CLR_ID_FLOAT);
98 palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
99 extcon_set_cable_state(&palmas_usb->edev, "USB-HOST", false);
Laxman Dewangan002945f2013-07-09 18:34:22 +0530100 dev_info(palmas_usb->dev, "USB-HOST cable is detached\n");
101 } else if ((palmas_usb->linkstat == PALMAS_USB_STATE_ID) &&
102 (!(set & PALMAS_USB_ID_INT_SRC_ID_GND))) {
103 palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
104 extcon_set_cable_state(&palmas_usb->edev, "USB-HOST", false);
105 dev_info(palmas_usb->dev, "USB-HOST cable is detached\n");
Graeme Gregoryb1f254e2013-05-28 10:50:11 +0900106 }
107
108 return IRQ_HANDLED;
109}
110
111static void palmas_enable_irq(struct palmas_usb *palmas_usb)
112{
113 palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
114 PALMAS_USB_VBUS_CTRL_SET,
115 PALMAS_USB_VBUS_CTRL_SET_VBUS_ACT_COMP);
116
117 palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
118 PALMAS_USB_ID_CTRL_SET, PALMAS_USB_ID_CTRL_SET_ID_ACT_COMP);
119
120 palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
121 PALMAS_USB_ID_INT_EN_HI_SET,
Laxman Dewangan002945f2013-07-09 18:34:22 +0530122 PALMAS_USB_ID_INT_EN_HI_SET_ID_GND |
123 PALMAS_USB_ID_INT_EN_HI_SET_ID_FLOAT);
Graeme Gregoryb1f254e2013-05-28 10:50:11 +0900124
Laxman Dewangan7281e052013-07-10 14:59:06 +0530125 if (palmas_usb->enable_vbus_detection)
126 palmas_vbus_irq_handler(palmas_usb->vbus_irq, palmas_usb);
Graeme Gregoryb1f254e2013-05-28 10:50:11 +0900127
128 /* cold plug for host mode needs this delay */
Laxman Dewangan7281e052013-07-10 14:59:06 +0530129 if (palmas_usb->enable_id_detection) {
130 msleep(30);
131 palmas_id_irq_handler(palmas_usb->id_irq, palmas_usb);
132 }
Graeme Gregoryb1f254e2013-05-28 10:50:11 +0900133}
134
135static int palmas_usb_probe(struct platform_device *pdev)
136{
137 struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);
138 struct palmas_usb_platform_data *pdata = pdev->dev.platform_data;
139 struct device_node *node = pdev->dev.of_node;
140 struct palmas_usb *palmas_usb;
141 int status;
142
Graeme Gregoryb1f254e2013-05-28 10:50:11 +0900143 palmas_usb = devm_kzalloc(&pdev->dev, sizeof(*palmas_usb), GFP_KERNEL);
144 if (!palmas_usb)
145 return -ENOMEM;
146
Laxman Dewangan7281e052013-07-10 14:59:06 +0530147 if (node && !pdata) {
148 palmas_usb->wakeup = of_property_read_bool(node, "ti,wakeup");
149 palmas_usb->enable_id_detection = of_property_read_bool(node,
150 "ti,enable-id-detection");
151 palmas_usb->enable_vbus_detection = of_property_read_bool(node,
152 "ti,enable-vbus-detection");
153 } else {
154 palmas_usb->wakeup = true;
155 palmas_usb->enable_id_detection = true;
156 palmas_usb->enable_vbus_detection = true;
157
158 if (pdata)
159 palmas_usb->wakeup = pdata->wakeup;
160 }
161
Graeme Gregoryb1f254e2013-05-28 10:50:11 +0900162 palmas->usb = palmas_usb;
163 palmas_usb->palmas = palmas;
164
165 palmas_usb->dev = &pdev->dev;
166
167 palmas_usb->id_otg_irq = regmap_irq_get_virq(palmas->irq_data,
168 PALMAS_ID_OTG_IRQ);
169 palmas_usb->id_irq = regmap_irq_get_virq(palmas->irq_data,
170 PALMAS_ID_IRQ);
171 palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data,
172 PALMAS_VBUS_OTG_IRQ);
173 palmas_usb->vbus_irq = regmap_irq_get_virq(palmas->irq_data,
174 PALMAS_VBUS_IRQ);
175
Laxman Dewangan7281e052013-07-10 14:59:06 +0530176 palmas_usb_wakeup(palmas, palmas_usb->wakeup);
Graeme Gregoryb1f254e2013-05-28 10:50:11 +0900177
178 platform_set_drvdata(pdev, palmas_usb);
179
Graeme Gregoryb1f254e2013-05-28 10:50:11 +0900180 palmas_usb->edev.supported_cable = palmas_extcon_cable;
181 palmas_usb->edev.mutually_exclusive = mutually_exclusive;
182
183 status = extcon_dev_register(&palmas_usb->edev, palmas_usb->dev);
184 if (status) {
185 dev_err(&pdev->dev, "failed to register extcon device\n");
186 return status;
187 }
188
Laxman Dewangan7281e052013-07-10 14:59:06 +0530189 if (palmas_usb->enable_id_detection) {
190 status = devm_request_threaded_irq(palmas_usb->dev,
191 palmas_usb->id_irq,
192 NULL, palmas_id_irq_handler,
193 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
194 IRQF_ONESHOT | IRQF_EARLY_RESUME,
195 "palmas_usb_id", palmas_usb);
196 if (status < 0) {
197 dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
Graeme Gregoryb1f254e2013-05-28 10:50:11 +0900198 palmas_usb->id_irq, status);
Laxman Dewangan7281e052013-07-10 14:59:06 +0530199 goto fail_extcon;
200 }
Graeme Gregoryb1f254e2013-05-28 10:50:11 +0900201 }
202
Laxman Dewangan7281e052013-07-10 14:59:06 +0530203 if (palmas_usb->enable_vbus_detection) {
204 status = devm_request_threaded_irq(palmas_usb->dev,
205 palmas_usb->vbus_irq, NULL,
206 palmas_vbus_irq_handler,
207 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
208 IRQF_ONESHOT | IRQF_EARLY_RESUME,
209 "palmas_usb_vbus", palmas_usb);
210 if (status < 0) {
211 dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
Graeme Gregoryb1f254e2013-05-28 10:50:11 +0900212 palmas_usb->vbus_irq, status);
Laxman Dewangan7281e052013-07-10 14:59:06 +0530213 goto fail_extcon;
214 }
Graeme Gregoryb1f254e2013-05-28 10:50:11 +0900215 }
216
217 palmas_enable_irq(palmas_usb);
Laxman Dewangan024783e2013-07-09 18:34:23 +0530218 device_set_wakeup_capable(&pdev->dev, true);
Graeme Gregoryb1f254e2013-05-28 10:50:11 +0900219 return 0;
220
221fail_extcon:
222 extcon_dev_unregister(&palmas_usb->edev);
223
224 return status;
225}
226
227static int palmas_usb_remove(struct platform_device *pdev)
228{
229 struct palmas_usb *palmas_usb = platform_get_drvdata(pdev);
230
231 extcon_dev_unregister(&palmas_usb->edev);
232
233 return 0;
234}
235
Laxman Dewangan024783e2013-07-09 18:34:23 +0530236#ifdef CONFIG_PM_SLEEP
237static int palmas_usb_suspend(struct device *dev)
238{
239 struct palmas_usb *palmas_usb = dev_get_drvdata(dev);
240
241 if (device_may_wakeup(dev)) {
Laxman Dewangan7281e052013-07-10 14:59:06 +0530242 if (palmas_usb->enable_vbus_detection)
243 enable_irq_wake(palmas_usb->vbus_irq);
244 if (palmas_usb->enable_id_detection)
245 enable_irq_wake(palmas_usb->id_irq);
Laxman Dewangan024783e2013-07-09 18:34:23 +0530246 }
247 return 0;
248}
249
250static int palmas_usb_resume(struct device *dev)
251{
252 struct palmas_usb *palmas_usb = dev_get_drvdata(dev);
253
254 if (device_may_wakeup(dev)) {
Laxman Dewangan7281e052013-07-10 14:59:06 +0530255 if (palmas_usb->enable_vbus_detection)
256 disable_irq_wake(palmas_usb->vbus_irq);
257 if (palmas_usb->enable_id_detection)
258 disable_irq_wake(palmas_usb->id_irq);
Laxman Dewangan024783e2013-07-09 18:34:23 +0530259 }
260 return 0;
261};
262#endif
263
264static const struct dev_pm_ops palmas_pm_ops = {
265 SET_SYSTEM_SLEEP_PM_OPS(palmas_usb_suspend,
266 palmas_usb_resume)
267};
268
Graeme Gregoryb1f254e2013-05-28 10:50:11 +0900269static struct of_device_id of_palmas_match_tbl[] = {
270 { .compatible = "ti,palmas-usb", },
271 { .compatible = "ti,twl6035-usb", },
272 { /* end */ }
273};
274
275static struct platform_driver palmas_usb_driver = {
276 .probe = palmas_usb_probe,
277 .remove = palmas_usb_remove,
278 .driver = {
279 .name = "palmas-usb",
280 .of_match_table = of_palmas_match_tbl,
281 .owner = THIS_MODULE,
Laxman Dewangan024783e2013-07-09 18:34:23 +0530282 .pm = &palmas_pm_ops,
Graeme Gregoryb1f254e2013-05-28 10:50:11 +0900283 },
284};
285
286module_platform_driver(palmas_usb_driver);
287
288MODULE_ALIAS("platform:palmas-usb");
289MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>");
290MODULE_DESCRIPTION("Palmas USB transceiver driver");
291MODULE_LICENSE("GPL");
292MODULE_DEVICE_TABLE(of, of_palmas_match_tbl);