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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>
Kishon Vijay Abraham If63d32d2014-03-28 12:21:02 +053026#include <linux/slab.h>
Graeme Gregoryb1f254e2013-05-28 10:50:11 +090027#include <linux/err.h>
28#include <linux/mfd/palmas.h>
29#include <linux/of.h>
30#include <linux/of_platform.h>
31
Chanwoo Choi73b6ecd2015-06-12 11:10:06 +090032static const unsigned int palmas_extcon_cable[] = {
Chanwoo Choi2a9de9c2015-04-24 19:16:05 +090033 EXTCON_USB,
34 EXTCON_USB_HOST,
35 EXTCON_NONE,
Graeme Gregoryb1f254e2013-05-28 10:50:11 +090036};
37
38static const int mutually_exclusive[] = {0x3, 0x0};
39
40static 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
49static irqreturn_t palmas_vbus_irq_handler(int irq, void *_palmas_usb)
50{
51 struct palmas_usb *palmas_usb = _palmas_usb;
Chanwoo Choi2a9de9c2015-04-24 19:16:05 +090052 struct extcon_dev *edev = palmas_usb->edev;
Graeme Gregoryb1f254e2013-05-28 10:50:11 +090053 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;
Chanwoo Choi2a9de9c2015-04-24 19:16:05 +090061 extcon_set_cable_state_(edev, EXTCON_USB, true);
Laxman Dewangan002945f2013-07-09 18:34:22 +053062 dev_info(palmas_usb->dev, "USB cable is attached\n");
Graeme Gregoryb1f254e2013-05-28 10:50:11 +090063 } 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;
Chanwoo Choi2a9de9c2015-04-24 19:16:05 +090070 extcon_set_cable_state_(edev, EXTCON_USB, false);
Laxman Dewangan002945f2013-07-09 18:34:22 +053071 dev_info(palmas_usb->dev, "USB cable is detached\n");
Graeme Gregoryb1f254e2013-05-28 10:50:11 +090072 } else {
73 dev_dbg(palmas_usb->dev,
74 "Spurious disconnect event detected\n");
75 }
76 }
77
78 return IRQ_HANDLED;
79}
80
81static irqreturn_t palmas_id_irq_handler(int irq, void *_palmas_usb)
82{
George Cherianb7d2d5b2013-10-11 00:18:39 +053083 unsigned int set, id_src;
Graeme Gregoryb1f254e2013-05-28 10:50:11 +090084 struct palmas_usb *palmas_usb = _palmas_usb;
Chanwoo Choi2a9de9c2015-04-24 19:16:05 +090085 struct extcon_dev *edev = palmas_usb->edev;
Graeme Gregoryb1f254e2013-05-28 10:50:11 +090086
87 palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
88 PALMAS_USB_ID_INT_LATCH_SET, &set);
George Cherianb7d2d5b2013-10-11 00:18:39 +053089 palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
90 PALMAS_USB_ID_INT_SRC, &id_src);
Graeme Gregoryb1f254e2013-05-28 10:50:11 +090091
George Cherianb7d2d5b2013-10-11 00:18:39 +053092 if ((set & PALMAS_USB_ID_INT_SRC_ID_GND) &&
93 (id_src & PALMAS_USB_ID_INT_SRC_ID_GND)) {
Graeme Gregoryb1f254e2013-05-28 10:50:11 +090094 palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
Graeme Gregoryb1f254e2013-05-28 10:50:11 +090095 PALMAS_USB_ID_INT_LATCH_CLR,
96 PALMAS_USB_ID_INT_EN_HI_CLR_ID_GND);
97 palmas_usb->linkstat = PALMAS_USB_STATE_ID;
Chanwoo Choi2a9de9c2015-04-24 19:16:05 +090098 extcon_set_cable_state_(edev, EXTCON_USB_HOST, true);
Laxman Dewangan002945f2013-07-09 18:34:22 +053099 dev_info(palmas_usb->dev, "USB-HOST cable is attached\n");
George Cherianb7d2d5b2013-10-11 00:18:39 +0530100 } else if ((set & PALMAS_USB_ID_INT_SRC_ID_FLOAT) &&
101 (id_src & PALMAS_USB_ID_INT_SRC_ID_FLOAT)) {
Graeme Gregoryb1f254e2013-05-28 10:50:11 +0900102 palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
Graeme Gregoryb1f254e2013-05-28 10:50:11 +0900103 PALMAS_USB_ID_INT_LATCH_CLR,
104 PALMAS_USB_ID_INT_EN_HI_CLR_ID_FLOAT);
105 palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
Chanwoo Choi2a9de9c2015-04-24 19:16:05 +0900106 extcon_set_cable_state_(edev, EXTCON_USB_HOST, false);
Laxman Dewangan002945f2013-07-09 18:34:22 +0530107 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;
Chanwoo Choi2a9de9c2015-04-24 19:16:05 +0900111 extcon_set_cable_state_(edev, EXTCON_USB_HOST, false);
Laxman Dewangan002945f2013-07-09 18:34:22 +0530112 dev_info(palmas_usb->dev, "USB-HOST cable is detached\n");
George Cherianb7d2d5b2013-10-11 00:18:39 +0530113 } 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;
Chanwoo Choi2a9de9c2015-04-24 19:16:05 +0900116 extcon_set_cable_state_(edev, EXTCON_USB_HOST, true);
George Cherianb7d2d5b2013-10-11 00:18:39 +0530117 dev_info(palmas_usb->dev, " USB-HOST cable is attached\n");
Graeme Gregoryb1f254e2013-05-28 10:50:11 +0900118 }
119
120 return IRQ_HANDLED;
121}
122
123static 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,
Laxman Dewangan002945f2013-07-09 18:34:22 +0530134 PALMAS_USB_ID_INT_EN_HI_SET_ID_GND |
135 PALMAS_USB_ID_INT_EN_HI_SET_ID_FLOAT);
Graeme Gregoryb1f254e2013-05-28 10:50:11 +0900136
Laxman Dewangan7281e052013-07-10 14:59:06 +0530137 if (palmas_usb->enable_vbus_detection)
138 palmas_vbus_irq_handler(palmas_usb->vbus_irq, palmas_usb);
Graeme Gregoryb1f254e2013-05-28 10:50:11 +0900139
140 /* cold plug for host mode needs this delay */
Laxman Dewangan7281e052013-07-10 14:59:06 +0530141 if (palmas_usb->enable_id_detection) {
142 msleep(30);
143 palmas_id_irq_handler(palmas_usb->id_irq, palmas_usb);
144 }
Graeme Gregoryb1f254e2013-05-28 10:50:11 +0900145}
146
147static int palmas_usb_probe(struct platform_device *pdev)
148{
149 struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);
Jingoo Han7c0f65582013-09-11 13:22:18 +0900150 struct palmas_usb_platform_data *pdata = dev_get_platdata(&pdev->dev);
Graeme Gregoryb1f254e2013-05-28 10:50:11 +0900151 struct device_node *node = pdev->dev.of_node;
152 struct palmas_usb *palmas_usb;
153 int status;
154
Graeme Gregoryb1f254e2013-05-28 10:50:11 +0900155 palmas_usb = devm_kzalloc(&pdev->dev, sizeof(*palmas_usb), GFP_KERNEL);
156 if (!palmas_usb)
157 return -ENOMEM;
158
Laxman Dewangan7281e052013-07-10 14:59:06 +0530159 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
Graeme Gregoryb1f254e2013-05-28 10:50:11 +0900174 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
Laxman Dewangan7281e052013-07-10 14:59:06 +0530188 palmas_usb_wakeup(palmas, palmas_usb->wakeup);
Graeme Gregoryb1f254e2013-05-28 10:50:11 +0900189
190 platform_set_drvdata(pdev, palmas_usb);
191
Chanwoo Choi3f79a3f2014-04-21 20:44:53 +0900192 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 }
Chanwoo Choi3f79a3f2014-04-21 20:44:53 +0900198 palmas_usb->edev->mutually_exclusive = mutually_exclusive;
Graeme Gregoryb1f254e2013-05-28 10:50:11 +0900199
Chanwoo Choi3f79a3f2014-04-21 20:44:53 +0900200 status = devm_extcon_dev_register(&pdev->dev, palmas_usb->edev);
Graeme Gregoryb1f254e2013-05-28 10:50:11 +0900201 if (status) {
202 dev_err(&pdev->dev, "failed to register extcon device\n");
203 return status;
204 }
205
Laxman Dewangan7281e052013-07-10 14:59:06 +0530206 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",
Graeme Gregoryb1f254e2013-05-28 10:50:11 +0900215 palmas_usb->id_irq, status);
Sangjung Woob4dad552014-04-21 19:10:14 +0900216 return status;
Laxman Dewangan7281e052013-07-10 14:59:06 +0530217 }
Graeme Gregoryb1f254e2013-05-28 10:50:11 +0900218 }
219
Laxman Dewangan7281e052013-07-10 14:59:06 +0530220 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",
Graeme Gregoryb1f254e2013-05-28 10:50:11 +0900229 palmas_usb->vbus_irq, status);
Sangjung Woob4dad552014-04-21 19:10:14 +0900230 return status;
Laxman Dewangan7281e052013-07-10 14:59:06 +0530231 }
Graeme Gregoryb1f254e2013-05-28 10:50:11 +0900232 }
233
234 palmas_enable_irq(palmas_usb);
Laxman Dewangan024783e2013-07-09 18:34:23 +0530235 device_set_wakeup_capable(&pdev->dev, true);
Graeme Gregoryb1f254e2013-05-28 10:50:11 +0900236 return 0;
Graeme Gregoryb1f254e2013-05-28 10:50:11 +0900237}
238
Laxman Dewangan024783e2013-07-09 18:34:23 +0530239#ifdef CONFIG_PM_SLEEP
240static 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)) {
Laxman Dewangan7281e052013-07-10 14:59:06 +0530245 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);
Laxman Dewangan024783e2013-07-09 18:34:23 +0530249 }
250 return 0;
251}
252
253static 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)) {
Laxman Dewangan7281e052013-07-10 14:59:06 +0530258 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);
Laxman Dewangan024783e2013-07-09 18:34:23 +0530262 }
263 return 0;
264};
265#endif
266
Jingoo Han8d4288f2014-02-27 20:36:15 +0900267static SIMPLE_DEV_PM_OPS(palmas_pm_ops, palmas_usb_suspend, palmas_usb_resume);
Laxman Dewangan024783e2013-07-09 18:34:23 +0530268
Krzysztof Kozlowski3bc2ac72014-05-23 11:03:05 +0200269static const struct of_device_id of_palmas_match_tbl[] = {
Graeme Gregoryb1f254e2013-05-28 10:50:11 +0900270 { .compatible = "ti,palmas-usb", },
Kishon Vijay Abraham I5fbc77d2013-10-10 18:07:27 +0530271 { .compatible = "ti,palmas-usb-vid", },
Graeme Gregoryb1f254e2013-05-28 10:50:11 +0900272 { .compatible = "ti,twl6035-usb", },
Kishon Vijay Abraham I5fbc77d2013-10-10 18:07:27 +0530273 { .compatible = "ti,twl6035-usb-vid", },
Graeme Gregoryb1f254e2013-05-28 10:50:11 +0900274 { /* end */ }
275};
276
277static struct platform_driver palmas_usb_driver = {
278 .probe = palmas_usb_probe,
Graeme Gregoryb1f254e2013-05-28 10:50:11 +0900279 .driver = {
280 .name = "palmas-usb",
281 .of_match_table = of_palmas_match_tbl,
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);