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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
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);
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
79static 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
120static 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
144static 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
231fail_extcon:
232 extcon_dev_unregister(&palmas_usb->edev);
233
234 return status;
235}
236
237static 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
247static 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
260static 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
274static SIMPLE_DEV_PM_OPS(palmas_pm_ops, palmas_usb_suspend, palmas_usb_resume);
275
276static struct of_device_id of_palmas_match_tbl[] = {
277 { .compatible = "ti,palmas-usb", },
278 { .compatible = "ti,palmas-usb-vid", },
279 { .compatible = "ti,twl6035-usb", },
280 { .compatible = "ti,twl6035-usb-vid", },
281 { /* end */ }
282};
283
284static struct platform_driver palmas_usb_driver = {
285 .probe = palmas_usb_probe,
286 .remove = palmas_usb_remove,
287 .driver = {
288 .name = "palmas-usb",
289 .of_match_table = of_palmas_match_tbl,
290 .owner = THIS_MODULE,
291 .pm = &palmas_pm_ops,
292 },
293};
294
295module_platform_driver(palmas_usb_driver);
296
297MODULE_ALIAS("platform:palmas-usb");
298MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>");
299MODULE_DESCRIPTION("Palmas USB transceiver driver");
300MODULE_LICENSE("GPL");
301MODULE_DEVICE_TABLE(of, of_palmas_match_tbl);