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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); | |
002945f0 | 60 | dev_info(palmas_usb->dev, "USB cable is attached\n"); |
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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); | |
002945f0 | 69 | dev_info(palmas_usb->dev, "USB cable is detached\n"); |
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70 | } else { |
71 | dev_dbg(palmas_usb->dev, | |
72 | "Spurious disconnect event detected\n"); | |
73 | } | |
74 | } | |
75 | ||
76 | return IRQ_HANDLED; | |
77 | } | |
78 | ||
79 | static irqreturn_t palmas_id_irq_handler(int irq, void *_palmas_usb) | |
80 | { | |
81 | unsigned int set; | |
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 | ||
87 | if (set & PALMAS_USB_ID_INT_SRC_ID_GND) { | |
b1f254e3 GG |
88 | palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE, |
89 | PALMAS_USB_ID_INT_LATCH_CLR, | |
90 | PALMAS_USB_ID_INT_EN_HI_CLR_ID_GND); | |
91 | palmas_usb->linkstat = PALMAS_USB_STATE_ID; | |
92 | extcon_set_cable_state(&palmas_usb->edev, "USB-HOST", true); | |
002945f0 | 93 | dev_info(palmas_usb->dev, "USB-HOST cable is attached\n"); |
b1f254e3 | 94 | } else if (set & PALMAS_USB_ID_INT_SRC_ID_FLOAT) { |
b1f254e3 GG |
95 | palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE, |
96 | PALMAS_USB_ID_INT_LATCH_CLR, | |
97 | PALMAS_USB_ID_INT_EN_HI_CLR_ID_FLOAT); | |
98 | palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT; | |
99 | extcon_set_cable_state(&palmas_usb->edev, "USB-HOST", false); | |
002945f0 LD |
100 | dev_info(palmas_usb->dev, "USB-HOST cable is detached\n"); |
101 | } else if ((palmas_usb->linkstat == PALMAS_USB_STATE_ID) && | |
102 | (!(set & PALMAS_USB_ID_INT_SRC_ID_GND))) { | |
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"); | |
b1f254e3 GG |
106 | } |
107 | ||
108 | return IRQ_HANDLED; | |
109 | } | |
110 | ||
111 | static void palmas_enable_irq(struct palmas_usb *palmas_usb) | |
112 | { | |
113 | palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE, | |
114 | PALMAS_USB_VBUS_CTRL_SET, | |
115 | PALMAS_USB_VBUS_CTRL_SET_VBUS_ACT_COMP); | |
116 | ||
117 | palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE, | |
118 | PALMAS_USB_ID_CTRL_SET, PALMAS_USB_ID_CTRL_SET_ID_ACT_COMP); | |
119 | ||
120 | palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE, | |
121 | PALMAS_USB_ID_INT_EN_HI_SET, | |
002945f0 LD |
122 | PALMAS_USB_ID_INT_EN_HI_SET_ID_GND | |
123 | PALMAS_USB_ID_INT_EN_HI_SET_ID_FLOAT); | |
b1f254e3 GG |
124 | |
125 | palmas_vbus_irq_handler(palmas_usb->vbus_irq, palmas_usb); | |
126 | ||
127 | /* cold plug for host mode needs this delay */ | |
128 | msleep(30); | |
129 | palmas_id_irq_handler(palmas_usb->id_irq, palmas_usb); | |
130 | } | |
131 | ||
132 | static int palmas_usb_probe(struct platform_device *pdev) | |
133 | { | |
134 | struct palmas *palmas = dev_get_drvdata(pdev->dev.parent); | |
135 | struct palmas_usb_platform_data *pdata = pdev->dev.platform_data; | |
136 | struct device_node *node = pdev->dev.of_node; | |
137 | struct palmas_usb *palmas_usb; | |
138 | int status; | |
139 | ||
140 | if (node && !pdata) { | |
141 | pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); | |
142 | ||
143 | if (!pdata) | |
144 | return -ENOMEM; | |
145 | ||
146 | pdata->wakeup = of_property_read_bool(node, "ti,wakeup"); | |
147 | } else if (!pdata) { | |
148 | return -EINVAL; | |
149 | } | |
150 | ||
151 | palmas_usb = devm_kzalloc(&pdev->dev, sizeof(*palmas_usb), GFP_KERNEL); | |
152 | if (!palmas_usb) | |
153 | return -ENOMEM; | |
154 | ||
155 | palmas->usb = palmas_usb; | |
156 | palmas_usb->palmas = palmas; | |
157 | ||
158 | palmas_usb->dev = &pdev->dev; | |
159 | ||
160 | palmas_usb->id_otg_irq = regmap_irq_get_virq(palmas->irq_data, | |
161 | PALMAS_ID_OTG_IRQ); | |
162 | palmas_usb->id_irq = regmap_irq_get_virq(palmas->irq_data, | |
163 | PALMAS_ID_IRQ); | |
164 | palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data, | |
165 | PALMAS_VBUS_OTG_IRQ); | |
166 | palmas_usb->vbus_irq = regmap_irq_get_virq(palmas->irq_data, | |
167 | PALMAS_VBUS_IRQ); | |
168 | ||
169 | palmas_usb_wakeup(palmas, pdata->wakeup); | |
170 | ||
171 | platform_set_drvdata(pdev, palmas_usb); | |
172 | ||
b1f254e3 GG |
173 | palmas_usb->edev.supported_cable = palmas_extcon_cable; |
174 | palmas_usb->edev.mutually_exclusive = mutually_exclusive; | |
175 | ||
176 | status = extcon_dev_register(&palmas_usb->edev, palmas_usb->dev); | |
177 | if (status) { | |
178 | dev_err(&pdev->dev, "failed to register extcon device\n"); | |
179 | return status; | |
180 | } | |
181 | ||
182 | status = devm_request_threaded_irq(palmas_usb->dev, palmas_usb->id_irq, | |
183 | NULL, palmas_id_irq_handler, | |
184 | IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING, | |
185 | "palmas_usb_id", palmas_usb); | |
186 | if (status < 0) { | |
187 | dev_err(&pdev->dev, "can't get IRQ %d, err %d\n", | |
188 | palmas_usb->id_irq, status); | |
189 | goto fail_extcon; | |
190 | } | |
191 | ||
192 | status = devm_request_threaded_irq(palmas_usb->dev, | |
193 | palmas_usb->vbus_irq, NULL, palmas_vbus_irq_handler, | |
194 | IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING, | |
195 | "palmas_usb_vbus", palmas_usb); | |
196 | if (status < 0) { | |
197 | dev_err(&pdev->dev, "can't get IRQ %d, err %d\n", | |
198 | palmas_usb->vbus_irq, status); | |
199 | goto fail_extcon; | |
200 | } | |
201 | ||
202 | palmas_enable_irq(palmas_usb); | |
203 | ||
204 | return 0; | |
205 | ||
206 | fail_extcon: | |
207 | extcon_dev_unregister(&palmas_usb->edev); | |
208 | ||
209 | return status; | |
210 | } | |
211 | ||
212 | static int palmas_usb_remove(struct platform_device *pdev) | |
213 | { | |
214 | struct palmas_usb *palmas_usb = platform_get_drvdata(pdev); | |
215 | ||
216 | extcon_dev_unregister(&palmas_usb->edev); | |
217 | ||
218 | return 0; | |
219 | } | |
220 | ||
221 | static struct of_device_id of_palmas_match_tbl[] = { | |
222 | { .compatible = "ti,palmas-usb", }, | |
223 | { .compatible = "ti,twl6035-usb", }, | |
224 | { /* end */ } | |
225 | }; | |
226 | ||
227 | static struct platform_driver palmas_usb_driver = { | |
228 | .probe = palmas_usb_probe, | |
229 | .remove = palmas_usb_remove, | |
230 | .driver = { | |
231 | .name = "palmas-usb", | |
232 | .of_match_table = of_palmas_match_tbl, | |
233 | .owner = THIS_MODULE, | |
234 | }, | |
235 | }; | |
236 | ||
237 | module_platform_driver(palmas_usb_driver); | |
238 | ||
239 | MODULE_ALIAS("platform:palmas-usb"); | |
240 | MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>"); | |
241 | MODULE_DESCRIPTION("Palmas USB transceiver driver"); | |
242 | MODULE_LICENSE("GPL"); | |
243 | MODULE_DEVICE_TABLE(of, of_palmas_match_tbl); |