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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 | ||
73b6ecdb | 32 | static const unsigned int palmas_extcon_cable[] = { |
2a9de9c0 CC |
33 | EXTCON_USB, |
34 | EXTCON_USB_HOST, | |
35 | EXTCON_NONE, | |
b1f254e3 GG |
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; | |
2a9de9c0 | 52 | struct extcon_dev *edev = palmas_usb->edev; |
b1f254e3 GG |
53 | 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; | |
2a9de9c0 | 61 | extcon_set_cable_state_(edev, EXTCON_USB, true); |
002945f0 | 62 | dev_info(palmas_usb->dev, "USB cable is attached\n"); |
b1f254e3 GG |
63 | } 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; | |
2a9de9c0 | 70 | extcon_set_cable_state_(edev, EXTCON_USB, false); |
002945f0 | 71 | dev_info(palmas_usb->dev, "USB cable is detached\n"); |
b1f254e3 GG |
72 | } else { |
73 | dev_dbg(palmas_usb->dev, | |
74 | "Spurious disconnect event detected\n"); | |
75 | } | |
76 | } | |
77 | ||
78 | return IRQ_HANDLED; | |
79 | } | |
80 | ||
81 | static irqreturn_t palmas_id_irq_handler(int irq, void *_palmas_usb) | |
82 | { | |
b7d2d5be | 83 | unsigned int set, id_src; |
b1f254e3 | 84 | struct palmas_usb *palmas_usb = _palmas_usb; |
2a9de9c0 | 85 | struct extcon_dev *edev = palmas_usb->edev; |
b1f254e3 GG |
86 | |
87 | palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE, | |
88 | PALMAS_USB_ID_INT_LATCH_SET, &set); | |
b7d2d5be GC |
89 | palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE, |
90 | PALMAS_USB_ID_INT_SRC, &id_src); | |
b1f254e3 | 91 | |
b7d2d5be GC |
92 | if ((set & PALMAS_USB_ID_INT_SRC_ID_GND) && |
93 | (id_src & PALMAS_USB_ID_INT_SRC_ID_GND)) { | |
b1f254e3 GG |
94 | palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE, |
95 | PALMAS_USB_ID_INT_LATCH_CLR, | |
96 | PALMAS_USB_ID_INT_EN_HI_CLR_ID_GND); | |
97 | palmas_usb->linkstat = PALMAS_USB_STATE_ID; | |
2a9de9c0 | 98 | extcon_set_cable_state_(edev, EXTCON_USB_HOST, true); |
002945f0 | 99 | dev_info(palmas_usb->dev, "USB-HOST cable is attached\n"); |
b7d2d5be GC |
100 | } else if ((set & PALMAS_USB_ID_INT_SRC_ID_FLOAT) && |
101 | (id_src & PALMAS_USB_ID_INT_SRC_ID_FLOAT)) { | |
b1f254e3 GG |
102 | palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE, |
103 | PALMAS_USB_ID_INT_LATCH_CLR, | |
104 | PALMAS_USB_ID_INT_EN_HI_CLR_ID_FLOAT); | |
105 | palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT; | |
2a9de9c0 | 106 | extcon_set_cable_state_(edev, EXTCON_USB_HOST, false); |
002945f0 LD |
107 | 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; | |
2a9de9c0 | 111 | extcon_set_cable_state_(edev, EXTCON_USB_HOST, false); |
002945f0 | 112 | dev_info(palmas_usb->dev, "USB-HOST cable is detached\n"); |
b7d2d5be GC |
113 | } 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; | |
2a9de9c0 | 116 | extcon_set_cable_state_(edev, EXTCON_USB_HOST, true); |
b7d2d5be | 117 | dev_info(palmas_usb->dev, " USB-HOST cable is attached\n"); |
b1f254e3 GG |
118 | } |
119 | ||
120 | return IRQ_HANDLED; | |
121 | } | |
122 | ||
123 | static 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, | |
002945f0 LD |
134 | PALMAS_USB_ID_INT_EN_HI_SET_ID_GND | |
135 | PALMAS_USB_ID_INT_EN_HI_SET_ID_FLOAT); | |
b1f254e3 | 136 | |
7281e05a LD |
137 | if (palmas_usb->enable_vbus_detection) |
138 | palmas_vbus_irq_handler(palmas_usb->vbus_irq, palmas_usb); | |
b1f254e3 GG |
139 | |
140 | /* cold plug for host mode needs this delay */ | |
7281e05a LD |
141 | if (palmas_usb->enable_id_detection) { |
142 | msleep(30); | |
143 | palmas_id_irq_handler(palmas_usb->id_irq, palmas_usb); | |
144 | } | |
b1f254e3 GG |
145 | } |
146 | ||
147 | static int palmas_usb_probe(struct platform_device *pdev) | |
148 | { | |
149 | struct palmas *palmas = dev_get_drvdata(pdev->dev.parent); | |
7c0f6558 | 150 | struct palmas_usb_platform_data *pdata = dev_get_platdata(&pdev->dev); |
b1f254e3 GG |
151 | struct device_node *node = pdev->dev.of_node; |
152 | struct palmas_usb *palmas_usb; | |
153 | int status; | |
154 | ||
b1f254e3 GG |
155 | palmas_usb = devm_kzalloc(&pdev->dev, sizeof(*palmas_usb), GFP_KERNEL); |
156 | if (!palmas_usb) | |
157 | return -ENOMEM; | |
158 | ||
7281e05a LD |
159 | 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 | ||
b1f254e3 GG |
174 | 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 | ||
7281e05a | 188 | palmas_usb_wakeup(palmas, palmas_usb->wakeup); |
b1f254e3 GG |
189 | |
190 | platform_set_drvdata(pdev, palmas_usb); | |
191 | ||
3f79a3fb CC |
192 | 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 | } | |
3f79a3fb | 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"); | |
203 | return status; | |
204 | } | |
205 | ||
7281e05a LD |
206 | 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", | |
b1f254e3 | 215 | palmas_usb->id_irq, status); |
b4dad55a | 216 | return status; |
7281e05a | 217 | } |
b1f254e3 GG |
218 | } |
219 | ||
7281e05a LD |
220 | 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", | |
b1f254e3 | 229 | palmas_usb->vbus_irq, status); |
b4dad55a | 230 | return status; |
7281e05a | 231 | } |
b1f254e3 GG |
232 | } |
233 | ||
234 | palmas_enable_irq(palmas_usb); | |
024783ef | 235 | device_set_wakeup_capable(&pdev->dev, true); |
b1f254e3 | 236 | return 0; |
b1f254e3 GG |
237 | } |
238 | ||
024783ef LD |
239 | #ifdef CONFIG_PM_SLEEP |
240 | static 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)) { | |
7281e05a LD |
245 | 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); | |
024783ef LD |
249 | } |
250 | return 0; | |
251 | } | |
252 | ||
253 | static 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)) { | |
7281e05a LD |
258 | 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); | |
024783ef LD |
262 | } |
263 | return 0; | |
264 | }; | |
265 | #endif | |
266 | ||
8d4288fb | 267 | static SIMPLE_DEV_PM_OPS(palmas_pm_ops, palmas_usb_suspend, palmas_usb_resume); |
024783ef | 268 | |
3bc2ac7d | 269 | static const struct of_device_id of_palmas_match_tbl[] = { |
b1f254e3 | 270 | { .compatible = "ti,palmas-usb", }, |
5fbc77d6 | 271 | { .compatible = "ti,palmas-usb-vid", }, |
b1f254e3 | 272 | { .compatible = "ti,twl6035-usb", }, |
5fbc77d6 | 273 | { .compatible = "ti,twl6035-usb-vid", }, |
b1f254e3 GG |
274 | { /* end */ } |
275 | }; | |
276 | ||
277 | static struct platform_driver palmas_usb_driver = { | |
278 | .probe = palmas_usb_probe, | |
b1f254e3 GG |
279 | .driver = { |
280 | .name = "palmas-usb", | |
281 | .of_match_table = of_palmas_match_tbl, | |
024783ef | 282 | .pm = &palmas_pm_ops, |
b1f254e3 GG |
283 | }, |
284 | }; | |
285 | ||
286 | module_platform_driver(palmas_usb_driver); | |
287 | ||
288 | MODULE_ALIAS("platform:palmas-usb"); | |
289 | MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>"); | |
290 | MODULE_DESCRIPTION("Palmas USB transceiver driver"); | |
291 | MODULE_LICENSE("GPL"); | |
292 | MODULE_DEVICE_TABLE(of, of_palmas_match_tbl); |