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 char *palmas_extcon_cable[] = {
33 [0] = "USB",
34 [1] = "USB-HOST",
35 NULL,
36 };
37
38 static const int mutually_exclusive[] = {0x3, 0x0};
39
palmas_usb_wakeup(struct palmas * palmas,int enable)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
palmas_vbus_irq_handler(int irq,void * _palmas_usb)49 static irqreturn_t palmas_vbus_irq_handler(int irq, void *_palmas_usb)
50 {
51 struct palmas_usb *palmas_usb = _palmas_usb;
52 unsigned int vbus_line_state;
53
54 palmas_read(palmas_usb->palmas, PALMAS_INTERRUPT_BASE,
55 PALMAS_INT3_LINE_STATE, &vbus_line_state);
56
57 if (vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS) {
58 if (palmas_usb->linkstat != PALMAS_USB_STATE_VBUS) {
59 palmas_usb->linkstat = PALMAS_USB_STATE_VBUS;
60 extcon_set_cable_state(palmas_usb->edev, "USB", true);
61 dev_info(palmas_usb->dev, "USB cable is attached\n");
62 } else {
63 dev_dbg(palmas_usb->dev,
64 "Spurious connect event detected\n");
65 }
66 } else if (!(vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS)) {
67 if (palmas_usb->linkstat == PALMAS_USB_STATE_VBUS) {
68 palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
69 extcon_set_cable_state(palmas_usb->edev, "USB", false);
70 dev_info(palmas_usb->dev, "USB cable is detached\n");
71 } else {
72 dev_dbg(palmas_usb->dev,
73 "Spurious disconnect event detected\n");
74 }
75 }
76
77 return IRQ_HANDLED;
78 }
79
palmas_id_irq_handler(int irq,void * _palmas_usb)80 static irqreturn_t palmas_id_irq_handler(int irq, void *_palmas_usb)
81 {
82 unsigned int set, id_src;
83 struct palmas_usb *palmas_usb = _palmas_usb;
84
85 palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
86 PALMAS_USB_ID_INT_LATCH_SET, &set);
87 palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
88 PALMAS_USB_ID_INT_SRC, &id_src);
89
90 if ((set & PALMAS_USB_ID_INT_SRC_ID_GND) &&
91 (id_src & PALMAS_USB_ID_INT_SRC_ID_GND)) {
92 palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
93 PALMAS_USB_ID_INT_LATCH_CLR,
94 PALMAS_USB_ID_INT_EN_HI_CLR_ID_GND);
95 palmas_usb->linkstat = PALMAS_USB_STATE_ID;
96 extcon_set_cable_state(palmas_usb->edev, "USB-HOST", true);
97 dev_info(palmas_usb->dev, "USB-HOST cable is attached\n");
98 } else if ((set & PALMAS_USB_ID_INT_SRC_ID_FLOAT) &&
99 (id_src & PALMAS_USB_ID_INT_SRC_ID_FLOAT)) {
100 palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
101 PALMAS_USB_ID_INT_LATCH_CLR,
102 PALMAS_USB_ID_INT_EN_HI_CLR_ID_FLOAT);
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");
106 } else if ((palmas_usb->linkstat == PALMAS_USB_STATE_ID) &&
107 (!(set & PALMAS_USB_ID_INT_SRC_ID_GND))) {
108 palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
109 extcon_set_cable_state(palmas_usb->edev, "USB-HOST", false);
110 dev_info(palmas_usb->dev, "USB-HOST cable is detached\n");
111 } else if ((palmas_usb->linkstat == PALMAS_USB_STATE_DISCONNECT) &&
112 (id_src & PALMAS_USB_ID_INT_SRC_ID_GND)) {
113 palmas_usb->linkstat = PALMAS_USB_STATE_ID;
114 extcon_set_cable_state(palmas_usb->edev, "USB-HOST", true);
115 dev_info(palmas_usb->dev, " USB-HOST cable is attached\n");
116 }
117
118 return IRQ_HANDLED;
119 }
120
palmas_enable_irq(struct palmas_usb * palmas_usb)121 static void palmas_enable_irq(struct palmas_usb *palmas_usb)
122 {
123 palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
124 PALMAS_USB_VBUS_CTRL_SET,
125 PALMAS_USB_VBUS_CTRL_SET_VBUS_ACT_COMP);
126
127 palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
128 PALMAS_USB_ID_CTRL_SET, PALMAS_USB_ID_CTRL_SET_ID_ACT_COMP);
129
130 palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
131 PALMAS_USB_ID_INT_EN_HI_SET,
132 PALMAS_USB_ID_INT_EN_HI_SET_ID_GND |
133 PALMAS_USB_ID_INT_EN_HI_SET_ID_FLOAT);
134
135 if (palmas_usb->enable_vbus_detection)
136 palmas_vbus_irq_handler(palmas_usb->vbus_irq, palmas_usb);
137
138 /* cold plug for host mode needs this delay */
139 if (palmas_usb->enable_id_detection) {
140 msleep(30);
141 palmas_id_irq_handler(palmas_usb->id_irq, palmas_usb);
142 }
143 }
144
palmas_usb_probe(struct platform_device * pdev)145 static int palmas_usb_probe(struct platform_device *pdev)
146 {
147 struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);
148 struct palmas_usb_platform_data *pdata = dev_get_platdata(&pdev->dev);
149 struct device_node *node = pdev->dev.of_node;
150 struct palmas_usb *palmas_usb;
151 int status;
152
153 if (!palmas) {
154 dev_err(&pdev->dev, "failed to get valid parent\n");
155 return -EINVAL;
156 }
157
158 palmas_usb = devm_kzalloc(&pdev->dev, sizeof(*palmas_usb), GFP_KERNEL);
159 if (!palmas_usb)
160 return -ENOMEM;
161
162 if (node && !pdata) {
163 palmas_usb->wakeup = of_property_read_bool(node, "ti,wakeup");
164 palmas_usb->enable_id_detection = of_property_read_bool(node,
165 "ti,enable-id-detection");
166 palmas_usb->enable_vbus_detection = of_property_read_bool(node,
167 "ti,enable-vbus-detection");
168 } else {
169 palmas_usb->wakeup = true;
170 palmas_usb->enable_id_detection = true;
171 palmas_usb->enable_vbus_detection = true;
172
173 if (pdata)
174 palmas_usb->wakeup = pdata->wakeup;
175 }
176
177 palmas->usb = palmas_usb;
178 palmas_usb->palmas = palmas;
179
180 palmas_usb->dev = &pdev->dev;
181
182 palmas_usb->id_otg_irq = regmap_irq_get_virq(palmas->irq_data,
183 PALMAS_ID_OTG_IRQ);
184 palmas_usb->id_irq = regmap_irq_get_virq(palmas->irq_data,
185 PALMAS_ID_IRQ);
186 palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data,
187 PALMAS_VBUS_OTG_IRQ);
188 palmas_usb->vbus_irq = regmap_irq_get_virq(palmas->irq_data,
189 PALMAS_VBUS_IRQ);
190
191 palmas_usb_wakeup(palmas, palmas_usb->wakeup);
192
193 platform_set_drvdata(pdev, palmas_usb);
194
195 palmas_usb->edev = devm_extcon_dev_allocate(&pdev->dev,
196 palmas_extcon_cable);
197 if (IS_ERR(palmas_usb->edev)) {
198 dev_err(&pdev->dev, "failed to allocate extcon device\n");
199 return -ENOMEM;
200 }
201 palmas_usb->edev->name = kstrdup(node->name, GFP_KERNEL);
202 palmas_usb->edev->mutually_exclusive = mutually_exclusive;
203
204 status = devm_extcon_dev_register(&pdev->dev, palmas_usb->edev);
205 if (status) {
206 dev_err(&pdev->dev, "failed to register extcon device\n");
207 kfree(palmas_usb->edev->name);
208 return status;
209 }
210
211 if (palmas_usb->enable_id_detection) {
212 status = devm_request_threaded_irq(palmas_usb->dev,
213 palmas_usb->id_irq,
214 NULL, palmas_id_irq_handler,
215 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
216 IRQF_ONESHOT | IRQF_EARLY_RESUME,
217 "palmas_usb_id", palmas_usb);
218 if (status < 0) {
219 dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
220 palmas_usb->id_irq, status);
221 kfree(palmas_usb->edev->name);
222 return status;
223 }
224 }
225
226 if (palmas_usb->enable_vbus_detection) {
227 status = devm_request_threaded_irq(palmas_usb->dev,
228 palmas_usb->vbus_irq, NULL,
229 palmas_vbus_irq_handler,
230 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
231 IRQF_ONESHOT | IRQF_EARLY_RESUME,
232 "palmas_usb_vbus", palmas_usb);
233 if (status < 0) {
234 dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
235 palmas_usb->vbus_irq, status);
236 kfree(palmas_usb->edev->name);
237 return status;
238 }
239 }
240
241 palmas_enable_irq(palmas_usb);
242 device_set_wakeup_capable(&pdev->dev, true);
243 return 0;
244 }
245
palmas_usb_remove(struct platform_device * pdev)246 static int palmas_usb_remove(struct platform_device *pdev)
247 {
248 struct palmas_usb *palmas_usb = platform_get_drvdata(pdev);
249
250 kfree(palmas_usb->edev->name);
251
252 return 0;
253 }
254
255 #ifdef CONFIG_PM_SLEEP
palmas_usb_suspend(struct device * dev)256 static int palmas_usb_suspend(struct device *dev)
257 {
258 struct palmas_usb *palmas_usb = dev_get_drvdata(dev);
259
260 if (device_may_wakeup(dev)) {
261 if (palmas_usb->enable_vbus_detection)
262 enable_irq_wake(palmas_usb->vbus_irq);
263 if (palmas_usb->enable_id_detection)
264 enable_irq_wake(palmas_usb->id_irq);
265 }
266 return 0;
267 }
268
palmas_usb_resume(struct device * dev)269 static int palmas_usb_resume(struct device *dev)
270 {
271 struct palmas_usb *palmas_usb = dev_get_drvdata(dev);
272
273 if (device_may_wakeup(dev)) {
274 if (palmas_usb->enable_vbus_detection)
275 disable_irq_wake(palmas_usb->vbus_irq);
276 if (palmas_usb->enable_id_detection)
277 disable_irq_wake(palmas_usb->id_irq);
278 }
279 return 0;
280 };
281 #endif
282
283 static SIMPLE_DEV_PM_OPS(palmas_pm_ops, palmas_usb_suspend, palmas_usb_resume);
284
285 static const struct of_device_id of_palmas_match_tbl[] = {
286 { .compatible = "ti,palmas-usb", },
287 { .compatible = "ti,palmas-usb-vid", },
288 { .compatible = "ti,twl6035-usb", },
289 { .compatible = "ti,twl6035-usb-vid", },
290 { /* end */ }
291 };
292
293 static struct platform_driver palmas_usb_driver = {
294 .probe = palmas_usb_probe,
295 .remove = palmas_usb_remove,
296 .driver = {
297 .name = "palmas-usb",
298 .of_match_table = of_palmas_match_tbl,
299 .owner = THIS_MODULE,
300 .pm = &palmas_pm_ops,
301 },
302 };
303
304 module_platform_driver(palmas_usb_driver);
305
306 MODULE_ALIAS("platform:palmas-usb");
307 MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>");
308 MODULE_DESCRIPTION("Palmas USB transceiver driver");
309 MODULE_LICENSE("GPL");
310 MODULE_DEVICE_TABLE(of, of_palmas_match_tbl);
311