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b1f254e3 GG |
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> | |
f63d32d4 | 26 | #include <linux/slab.h> |
b1f254e3 GG |
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 | ||
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 | ||
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; | |
3f79a3fb | 60 | extcon_set_cable_state(palmas_usb->edev, "USB", true); |
002945f0 | 61 | dev_info(palmas_usb->dev, "USB cable is attached\n"); |
b1f254e3 GG |
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; | |
3f79a3fb | 69 | extcon_set_cable_state(palmas_usb->edev, "USB", false); |
002945f0 | 70 | dev_info(palmas_usb->dev, "USB cable is detached\n"); |
b1f254e3 GG |
71 | } else { |
72 | dev_dbg(palmas_usb->dev, | |
73 | "Spurious disconnect event detected\n"); | |
74 | } | |
75 | } | |
76 | ||
77 | return IRQ_HANDLED; | |
78 | } | |
79 | ||
80 | static irqreturn_t palmas_id_irq_handler(int irq, void *_palmas_usb) | |
81 | { | |
b7d2d5be | 82 | unsigned int set, id_src; |
b1f254e3 GG |
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); | |
b7d2d5be GC |
87 | palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE, |
88 | PALMAS_USB_ID_INT_SRC, &id_src); | |
b1f254e3 | 89 | |
b7d2d5be GC |
90 | if ((set & PALMAS_USB_ID_INT_SRC_ID_GND) && |
91 | (id_src & PALMAS_USB_ID_INT_SRC_ID_GND)) { | |
b1f254e3 GG |
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; | |
3f79a3fb | 96 | extcon_set_cable_state(palmas_usb->edev, "USB-HOST", true); |
002945f0 | 97 | dev_info(palmas_usb->dev, "USB-HOST cable is attached\n"); |
b7d2d5be GC |
98 | } else if ((set & PALMAS_USB_ID_INT_SRC_ID_FLOAT) && |
99 | (id_src & PALMAS_USB_ID_INT_SRC_ID_FLOAT)) { | |
b1f254e3 GG |
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; | |
3f79a3fb | 104 | extcon_set_cable_state(palmas_usb->edev, "USB-HOST", false); |
002945f0 LD |
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; | |
3f79a3fb | 109 | extcon_set_cable_state(palmas_usb->edev, "USB-HOST", false); |
002945f0 | 110 | dev_info(palmas_usb->dev, "USB-HOST cable is detached\n"); |
b7d2d5be GC |
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; | |
3f79a3fb | 114 | extcon_set_cable_state(palmas_usb->edev, "USB-HOST", true); |
b7d2d5be | 115 | dev_info(palmas_usb->dev, " USB-HOST cable is attached\n"); |
b1f254e3 GG |
116 | } |
117 | ||
118 | return IRQ_HANDLED; | |
119 | } | |
120 | ||
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, | |
002945f0 LD |
132 | PALMAS_USB_ID_INT_EN_HI_SET_ID_GND | |
133 | PALMAS_USB_ID_INT_EN_HI_SET_ID_FLOAT); | |
b1f254e3 | 134 | |
7281e05a LD |
135 | if (palmas_usb->enable_vbus_detection) |
136 | palmas_vbus_irq_handler(palmas_usb->vbus_irq, palmas_usb); | |
b1f254e3 GG |
137 | |
138 | /* cold plug for host mode needs this delay */ | |
7281e05a LD |
139 | if (palmas_usb->enable_id_detection) { |
140 | msleep(30); | |
141 | palmas_id_irq_handler(palmas_usb->id_irq, palmas_usb); | |
142 | } | |
b1f254e3 GG |
143 | } |
144 | ||
145 | static int palmas_usb_probe(struct platform_device *pdev) | |
146 | { | |
147 | struct palmas *palmas = dev_get_drvdata(pdev->dev.parent); | |
7c0f6558 | 148 | struct palmas_usb_platform_data *pdata = dev_get_platdata(&pdev->dev); |
b1f254e3 GG |
149 | struct device_node *node = pdev->dev.of_node; |
150 | struct palmas_usb *palmas_usb; | |
151 | int status; | |
152 | ||
b1f254e3 GG |
153 | palmas_usb = devm_kzalloc(&pdev->dev, sizeof(*palmas_usb), GFP_KERNEL); |
154 | if (!palmas_usb) | |
155 | return -ENOMEM; | |
156 | ||
7281e05a LD |
157 | if (node && !pdata) { |
158 | palmas_usb->wakeup = of_property_read_bool(node, "ti,wakeup"); | |
159 | palmas_usb->enable_id_detection = of_property_read_bool(node, | |
160 | "ti,enable-id-detection"); | |
161 | palmas_usb->enable_vbus_detection = of_property_read_bool(node, | |
162 | "ti,enable-vbus-detection"); | |
163 | } else { | |
164 | palmas_usb->wakeup = true; | |
165 | palmas_usb->enable_id_detection = true; | |
166 | palmas_usb->enable_vbus_detection = true; | |
167 | ||
168 | if (pdata) | |
169 | palmas_usb->wakeup = pdata->wakeup; | |
170 | } | |
171 | ||
b1f254e3 GG |
172 | palmas->usb = palmas_usb; |
173 | palmas_usb->palmas = palmas; | |
174 | ||
175 | palmas_usb->dev = &pdev->dev; | |
176 | ||
177 | palmas_usb->id_otg_irq = regmap_irq_get_virq(palmas->irq_data, | |
178 | PALMAS_ID_OTG_IRQ); | |
179 | palmas_usb->id_irq = regmap_irq_get_virq(palmas->irq_data, | |
180 | PALMAS_ID_IRQ); | |
181 | palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data, | |
182 | PALMAS_VBUS_OTG_IRQ); | |
183 | palmas_usb->vbus_irq = regmap_irq_get_virq(palmas->irq_data, | |
184 | PALMAS_VBUS_IRQ); | |
185 | ||
7281e05a | 186 | palmas_usb_wakeup(palmas, palmas_usb->wakeup); |
b1f254e3 GG |
187 | |
188 | platform_set_drvdata(pdev, palmas_usb); | |
189 | ||
3f79a3fb CC |
190 | palmas_usb->edev = devm_extcon_dev_allocate(&pdev->dev, |
191 | palmas_extcon_cable); | |
192 | if (IS_ERR(palmas_usb->edev)) { | |
193 | dev_err(&pdev->dev, "failed to allocate extcon device\n"); | |
194 | return -ENOMEM; | |
195 | } | |
196 | palmas_usb->edev->name = kstrdup(node->name, GFP_KERNEL); | |
197 | palmas_usb->edev->dev.parent = palmas_usb->dev; | |
198 | palmas_usb->edev->mutually_exclusive = mutually_exclusive; | |
b1f254e3 | 199 | |
3f79a3fb | 200 | status = devm_extcon_dev_register(&pdev->dev, palmas_usb->edev); |
b1f254e3 GG |
201 | if (status) { |
202 | dev_err(&pdev->dev, "failed to register extcon device\n"); | |
3f79a3fb | 203 | kfree(palmas_usb->edev->name); |
b1f254e3 GG |
204 | return status; |
205 | } | |
206 | ||
7281e05a LD |
207 | if (palmas_usb->enable_id_detection) { |
208 | status = devm_request_threaded_irq(palmas_usb->dev, | |
209 | palmas_usb->id_irq, | |
210 | NULL, palmas_id_irq_handler, | |
211 | IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | | |
212 | IRQF_ONESHOT | IRQF_EARLY_RESUME, | |
213 | "palmas_usb_id", palmas_usb); | |
214 | if (status < 0) { | |
215 | dev_err(&pdev->dev, "can't get IRQ %d, err %d\n", | |
b1f254e3 | 216 | palmas_usb->id_irq, status); |
3f79a3fb | 217 | kfree(palmas_usb->edev->name); |
b4dad55a | 218 | return status; |
7281e05a | 219 | } |
b1f254e3 GG |
220 | } |
221 | ||
7281e05a LD |
222 | if (palmas_usb->enable_vbus_detection) { |
223 | status = devm_request_threaded_irq(palmas_usb->dev, | |
224 | palmas_usb->vbus_irq, NULL, | |
225 | palmas_vbus_irq_handler, | |
226 | IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | | |
227 | IRQF_ONESHOT | IRQF_EARLY_RESUME, | |
228 | "palmas_usb_vbus", palmas_usb); | |
229 | if (status < 0) { | |
230 | dev_err(&pdev->dev, "can't get IRQ %d, err %d\n", | |
b1f254e3 | 231 | palmas_usb->vbus_irq, status); |
3f79a3fb | 232 | kfree(palmas_usb->edev->name); |
b4dad55a | 233 | return status; |
7281e05a | 234 | } |
b1f254e3 GG |
235 | } |
236 | ||
237 | palmas_enable_irq(palmas_usb); | |
024783ef | 238 | device_set_wakeup_capable(&pdev->dev, true); |
b1f254e3 | 239 | return 0; |
b1f254e3 GG |
240 | } |
241 | ||
242 | static int palmas_usb_remove(struct platform_device *pdev) | |
243 | { | |
244 | struct palmas_usb *palmas_usb = platform_get_drvdata(pdev); | |
245 | ||
3f79a3fb | 246 | kfree(palmas_usb->edev->name); |
b1f254e3 GG |
247 | |
248 | return 0; | |
249 | } | |
250 | ||
024783ef LD |
251 | #ifdef CONFIG_PM_SLEEP |
252 | static int palmas_usb_suspend(struct device *dev) | |
253 | { | |
254 | struct palmas_usb *palmas_usb = dev_get_drvdata(dev); | |
255 | ||
256 | if (device_may_wakeup(dev)) { | |
7281e05a LD |
257 | if (palmas_usb->enable_vbus_detection) |
258 | enable_irq_wake(palmas_usb->vbus_irq); | |
259 | if (palmas_usb->enable_id_detection) | |
260 | enable_irq_wake(palmas_usb->id_irq); | |
024783ef LD |
261 | } |
262 | return 0; | |
263 | } | |
264 | ||
265 | static int palmas_usb_resume(struct device *dev) | |
266 | { | |
267 | struct palmas_usb *palmas_usb = dev_get_drvdata(dev); | |
268 | ||
269 | if (device_may_wakeup(dev)) { | |
7281e05a LD |
270 | if (palmas_usb->enable_vbus_detection) |
271 | disable_irq_wake(palmas_usb->vbus_irq); | |
272 | if (palmas_usb->enable_id_detection) | |
273 | disable_irq_wake(palmas_usb->id_irq); | |
024783ef LD |
274 | } |
275 | return 0; | |
276 | }; | |
277 | #endif | |
278 | ||
8d4288fb | 279 | static SIMPLE_DEV_PM_OPS(palmas_pm_ops, palmas_usb_suspend, palmas_usb_resume); |
024783ef | 280 | |
b1f254e3 GG |
281 | static struct of_device_id of_palmas_match_tbl[] = { |
282 | { .compatible = "ti,palmas-usb", }, | |
5fbc77d6 | 283 | { .compatible = "ti,palmas-usb-vid", }, |
b1f254e3 | 284 | { .compatible = "ti,twl6035-usb", }, |
5fbc77d6 | 285 | { .compatible = "ti,twl6035-usb-vid", }, |
b1f254e3 GG |
286 | { /* end */ } |
287 | }; | |
288 | ||
289 | static struct platform_driver palmas_usb_driver = { | |
290 | .probe = palmas_usb_probe, | |
291 | .remove = palmas_usb_remove, | |
292 | .driver = { | |
293 | .name = "palmas-usb", | |
294 | .of_match_table = of_palmas_match_tbl, | |
295 | .owner = THIS_MODULE, | |
024783ef | 296 | .pm = &palmas_pm_ops, |
b1f254e3 GG |
297 | }, |
298 | }; | |
299 | ||
300 | module_platform_driver(palmas_usb_driver); | |
301 | ||
302 | MODULE_ALIAS("platform:palmas-usb"); | |
303 | MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>"); | |
304 | MODULE_DESCRIPTION("Palmas USB transceiver driver"); | |
305 | MODULE_LICENSE("GPL"); | |
306 | MODULE_DEVICE_TABLE(of, of_palmas_match_tbl); |