2 * Palmas USB transceiver driver
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.
10 * Author: Graeme Gregory <gg@slimlogic.co.uk>
11 * Author: Kishon Vijay Abraham I <kishon@ti.com>
13 * Based on twl6030_usb.c
15 * Author: Hema HK <hemahk@ti.com>
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.
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>
30 #include <linux/of_platform.h>
32 static const unsigned int palmas_extcon_cable[] = {
38 static void palmas_usb_wakeup(struct palmas *palmas, int enable)
41 palmas_write(palmas, PALMAS_USB_OTG_BASE, PALMAS_USB_WAKEUP,
42 PALMAS_USB_WAKEUP_ID_WK_UP_COMP);
44 palmas_write(palmas, PALMAS_USB_OTG_BASE, PALMAS_USB_WAKEUP, 0);
47 static irqreturn_t palmas_vbus_irq_handler(int irq, void *_palmas_usb)
49 struct palmas_usb *palmas_usb = _palmas_usb;
50 struct extcon_dev *edev = palmas_usb->edev;
51 unsigned int vbus_line_state;
53 palmas_read(palmas_usb->palmas, PALMAS_INTERRUPT_BASE,
54 PALMAS_INT3_LINE_STATE, &vbus_line_state);
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_(edev, EXTCON_USB, true);
60 dev_info(palmas_usb->dev, "USB cable is attached\n");
62 dev_dbg(palmas_usb->dev,
63 "Spurious connect event detected\n");
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_(edev, EXTCON_USB, false);
69 dev_info(palmas_usb->dev, "USB cable is detached\n");
71 dev_dbg(palmas_usb->dev,
72 "Spurious disconnect event detected\n");
79 static irqreturn_t palmas_id_irq_handler(int irq, void *_palmas_usb)
81 unsigned int set, id_src;
82 struct palmas_usb *palmas_usb = _palmas_usb;
83 struct extcon_dev *edev = palmas_usb->edev;
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);
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_(edev, EXTCON_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_(edev, EXTCON_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_(edev, EXTCON_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_(edev, EXTCON_USB_HOST, true);
115 dev_info(palmas_usb->dev, " USB-HOST cable is attached\n");
121 static void palmas_enable_irq(struct palmas_usb *palmas_usb)
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);
127 palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
128 PALMAS_USB_ID_CTRL_SET, PALMAS_USB_ID_CTRL_SET_ID_ACT_COMP);
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);
135 if (palmas_usb->enable_vbus_detection)
136 palmas_vbus_irq_handler(palmas_usb->vbus_irq, palmas_usb);
138 /* cold plug for host mode needs this delay */
139 if (palmas_usb->enable_id_detection) {
141 palmas_id_irq_handler(palmas_usb->id_irq, palmas_usb);
145 static int palmas_usb_probe(struct platform_device *pdev)
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;
153 palmas_usb = devm_kzalloc(&pdev->dev, sizeof(*palmas_usb), GFP_KERNEL);
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");
164 palmas_usb->wakeup = true;
165 palmas_usb->enable_id_detection = true;
166 palmas_usb->enable_vbus_detection = true;
169 palmas_usb->wakeup = pdata->wakeup;
172 palmas->usb = palmas_usb;
173 palmas_usb->palmas = palmas;
175 palmas_usb->dev = &pdev->dev;
177 palmas_usb->id_otg_irq = regmap_irq_get_virq(palmas->irq_data,
179 palmas_usb->id_irq = regmap_irq_get_virq(palmas->irq_data,
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,
186 palmas_usb_wakeup(palmas, palmas_usb->wakeup);
188 platform_set_drvdata(pdev, palmas_usb);
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");
197 status = devm_extcon_dev_register(&pdev->dev, palmas_usb->edev);
199 dev_err(&pdev->dev, "failed to register extcon device\n");
203 if (palmas_usb->enable_id_detection) {
204 status = devm_request_threaded_irq(palmas_usb->dev,
206 NULL, palmas_id_irq_handler,
207 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
208 IRQF_ONESHOT | IRQF_EARLY_RESUME,
209 "palmas_usb_id", palmas_usb);
211 dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
212 palmas_usb->id_irq, status);
217 if (palmas_usb->enable_vbus_detection) {
218 status = devm_request_threaded_irq(palmas_usb->dev,
219 palmas_usb->vbus_irq, NULL,
220 palmas_vbus_irq_handler,
221 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
222 IRQF_ONESHOT | IRQF_EARLY_RESUME,
223 "palmas_usb_vbus", palmas_usb);
225 dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
226 palmas_usb->vbus_irq, status);
231 palmas_enable_irq(palmas_usb);
232 device_set_wakeup_capable(&pdev->dev, true);
236 #ifdef CONFIG_PM_SLEEP
237 static int palmas_usb_suspend(struct device *dev)
239 struct palmas_usb *palmas_usb = dev_get_drvdata(dev);
241 if (device_may_wakeup(dev)) {
242 if (palmas_usb->enable_vbus_detection)
243 enable_irq_wake(palmas_usb->vbus_irq);
244 if (palmas_usb->enable_id_detection)
245 enable_irq_wake(palmas_usb->id_irq);
250 static int palmas_usb_resume(struct device *dev)
252 struct palmas_usb *palmas_usb = dev_get_drvdata(dev);
254 if (device_may_wakeup(dev)) {
255 if (palmas_usb->enable_vbus_detection)
256 disable_irq_wake(palmas_usb->vbus_irq);
257 if (palmas_usb->enable_id_detection)
258 disable_irq_wake(palmas_usb->id_irq);
264 static SIMPLE_DEV_PM_OPS(palmas_pm_ops, palmas_usb_suspend, palmas_usb_resume);
266 static const struct of_device_id of_palmas_match_tbl[] = {
267 { .compatible = "ti,palmas-usb", },
268 { .compatible = "ti,palmas-usb-vid", },
269 { .compatible = "ti,twl6035-usb", },
270 { .compatible = "ti,twl6035-usb-vid", },
274 static struct platform_driver palmas_usb_driver = {
275 .probe = palmas_usb_probe,
277 .name = "palmas-usb",
278 .of_match_table = of_palmas_match_tbl,
279 .pm = &palmas_pm_ops,
283 module_platform_driver(palmas_usb_driver);
285 MODULE_ALIAS("platform:palmas-usb");
286 MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>");
287 MODULE_DESCRIPTION("Palmas USB transceiver driver");
288 MODULE_LICENSE("GPL");
289 MODULE_DEVICE_TABLE(of, of_palmas_match_tbl);