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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> | |
26 | #include <linux/err.h> | |
27 | #include <linux/mfd/palmas.h> | |
28 | #include <linux/of.h> | |
29 | #include <linux/of_platform.h> | |
30 | ||
31 | static const char *palmas_extcon_cable[] = { | |
32 | [0] = "USB", | |
33 | [1] = "USB-HOST", | |
34 | NULL, | |
35 | }; | |
36 | ||
37 | static const int mutually_exclusive[] = {0x3, 0x0}; | |
38 | ||
39 | static 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 | ||
48 | static 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 | } else { | |
61 | dev_dbg(palmas_usb->dev, | |
62 | "Spurious connect event detected\n"); | |
63 | } | |
64 | } else if (!(vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS)) { | |
65 | if (palmas_usb->linkstat == PALMAS_USB_STATE_VBUS) { | |
66 | palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT; | |
67 | extcon_set_cable_state(&palmas_usb->edev, "USB", false); | |
68 | } else { | |
69 | dev_dbg(palmas_usb->dev, | |
70 | "Spurious disconnect event detected\n"); | |
71 | } | |
72 | } | |
73 | ||
74 | return IRQ_HANDLED; | |
75 | } | |
76 | ||
77 | static irqreturn_t palmas_id_irq_handler(int irq, void *_palmas_usb) | |
78 | { | |
79 | unsigned int set; | |
80 | struct palmas_usb *palmas_usb = _palmas_usb; | |
81 | ||
82 | palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE, | |
83 | PALMAS_USB_ID_INT_LATCH_SET, &set); | |
84 | ||
85 | if (set & PALMAS_USB_ID_INT_SRC_ID_GND) { | |
86 | palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE, | |
87 | PALMAS_USB_ID_INT_EN_HI_SET, | |
88 | PALMAS_USB_ID_INT_EN_HI_SET_ID_FLOAT); | |
89 | palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE, | |
90 | PALMAS_USB_ID_INT_EN_HI_CLR, | |
91 | PALMAS_USB_ID_INT_EN_HI_CLR_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 | } else if (set & PALMAS_USB_ID_INT_SRC_ID_FLOAT) { | |
98 | palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE, | |
99 | PALMAS_USB_ID_INT_EN_HI_SET, | |
100 | PALMAS_USB_ID_INT_EN_HI_SET_ID_GND); | |
101 | palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE, | |
102 | PALMAS_USB_ID_INT_EN_HI_CLR, | |
103 | PALMAS_USB_ID_INT_EN_HI_CLR_ID_FLOAT); | |
104 | palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE, | |
105 | PALMAS_USB_ID_INT_LATCH_CLR, | |
106 | PALMAS_USB_ID_INT_EN_HI_CLR_ID_FLOAT); | |
107 | palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT; | |
108 | extcon_set_cable_state(&palmas_usb->edev, "USB-HOST", false); | |
109 | } | |
110 | ||
111 | return IRQ_HANDLED; | |
112 | } | |
113 | ||
114 | static void palmas_enable_irq(struct palmas_usb *palmas_usb) | |
115 | { | |
116 | palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE, | |
117 | PALMAS_USB_VBUS_CTRL_SET, | |
118 | PALMAS_USB_VBUS_CTRL_SET_VBUS_ACT_COMP); | |
119 | ||
120 | palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE, | |
121 | PALMAS_USB_ID_CTRL_SET, PALMAS_USB_ID_CTRL_SET_ID_ACT_COMP); | |
122 | ||
123 | palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE, | |
124 | PALMAS_USB_ID_INT_EN_HI_SET, | |
125 | PALMAS_USB_ID_INT_EN_HI_SET_ID_GND); | |
126 | ||
127 | palmas_vbus_irq_handler(palmas_usb->vbus_irq, palmas_usb); | |
128 | ||
129 | /* cold plug for host mode needs this delay */ | |
130 | msleep(30); | |
131 | palmas_id_irq_handler(palmas_usb->id_irq, palmas_usb); | |
132 | } | |
133 | ||
134 | static int palmas_usb_probe(struct platform_device *pdev) | |
135 | { | |
136 | struct palmas *palmas = dev_get_drvdata(pdev->dev.parent); | |
137 | struct palmas_usb_platform_data *pdata = pdev->dev.platform_data; | |
138 | struct device_node *node = pdev->dev.of_node; | |
139 | struct palmas_usb *palmas_usb; | |
140 | int status; | |
141 | ||
142 | if (node && !pdata) { | |
143 | pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); | |
144 | ||
145 | if (!pdata) | |
146 | return -ENOMEM; | |
147 | ||
148 | pdata->wakeup = of_property_read_bool(node, "ti,wakeup"); | |
149 | } else if (!pdata) { | |
150 | return -EINVAL; | |
151 | } | |
152 | ||
153 | palmas_usb = devm_kzalloc(&pdev->dev, sizeof(*palmas_usb), GFP_KERNEL); | |
154 | if (!palmas_usb) | |
155 | return -ENOMEM; | |
156 | ||
157 | palmas->usb = palmas_usb; | |
158 | palmas_usb->palmas = palmas; | |
159 | ||
160 | palmas_usb->dev = &pdev->dev; | |
161 | ||
162 | palmas_usb->id_otg_irq = regmap_irq_get_virq(palmas->irq_data, | |
163 | PALMAS_ID_OTG_IRQ); | |
164 | palmas_usb->id_irq = regmap_irq_get_virq(palmas->irq_data, | |
165 | PALMAS_ID_IRQ); | |
166 | palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data, | |
167 | PALMAS_VBUS_OTG_IRQ); | |
168 | palmas_usb->vbus_irq = regmap_irq_get_virq(palmas->irq_data, | |
169 | PALMAS_VBUS_IRQ); | |
170 | ||
171 | palmas_usb_wakeup(palmas, pdata->wakeup); | |
172 | ||
173 | platform_set_drvdata(pdev, palmas_usb); | |
174 | ||
175 | palmas_usb->edev.name = "palmas-usb"; | |
176 | palmas_usb->edev.supported_cable = palmas_extcon_cable; | |
177 | palmas_usb->edev.mutually_exclusive = mutually_exclusive; | |
178 | ||
179 | status = extcon_dev_register(&palmas_usb->edev, palmas_usb->dev); | |
180 | if (status) { | |
181 | dev_err(&pdev->dev, "failed to register extcon device\n"); | |
182 | return status; | |
183 | } | |
184 | ||
185 | status = devm_request_threaded_irq(palmas_usb->dev, palmas_usb->id_irq, | |
186 | NULL, palmas_id_irq_handler, | |
187 | IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING, | |
188 | "palmas_usb_id", palmas_usb); | |
189 | if (status < 0) { | |
190 | dev_err(&pdev->dev, "can't get IRQ %d, err %d\n", | |
191 | palmas_usb->id_irq, status); | |
192 | goto fail_extcon; | |
193 | } | |
194 | ||
195 | status = devm_request_threaded_irq(palmas_usb->dev, | |
196 | palmas_usb->vbus_irq, NULL, palmas_vbus_irq_handler, | |
197 | IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING, | |
198 | "palmas_usb_vbus", palmas_usb); | |
199 | if (status < 0) { | |
200 | dev_err(&pdev->dev, "can't get IRQ %d, err %d\n", | |
201 | palmas_usb->vbus_irq, status); | |
202 | goto fail_extcon; | |
203 | } | |
204 | ||
205 | palmas_enable_irq(palmas_usb); | |
206 | ||
207 | return 0; | |
208 | ||
209 | fail_extcon: | |
210 | extcon_dev_unregister(&palmas_usb->edev); | |
211 | ||
212 | return status; | |
213 | } | |
214 | ||
215 | static int palmas_usb_remove(struct platform_device *pdev) | |
216 | { | |
217 | struct palmas_usb *palmas_usb = platform_get_drvdata(pdev); | |
218 | ||
219 | extcon_dev_unregister(&palmas_usb->edev); | |
220 | ||
221 | return 0; | |
222 | } | |
223 | ||
224 | static struct of_device_id of_palmas_match_tbl[] = { | |
225 | { .compatible = "ti,palmas-usb", }, | |
226 | { .compatible = "ti,twl6035-usb", }, | |
227 | { /* end */ } | |
228 | }; | |
229 | ||
230 | static struct platform_driver palmas_usb_driver = { | |
231 | .probe = palmas_usb_probe, | |
232 | .remove = palmas_usb_remove, | |
233 | .driver = { | |
234 | .name = "palmas-usb", | |
235 | .of_match_table = of_palmas_match_tbl, | |
236 | .owner = THIS_MODULE, | |
237 | }, | |
238 | }; | |
239 | ||
240 | module_platform_driver(palmas_usb_driver); | |
241 | ||
242 | MODULE_ALIAS("platform:palmas-usb"); | |
243 | MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>"); | |
244 | MODULE_DESCRIPTION("Palmas USB transceiver driver"); | |
245 | MODULE_LICENSE("GPL"); | |
246 | MODULE_DEVICE_TABLE(of, of_palmas_match_tbl); |