xburst: switch to 3.3 and add broken flag
[openwrt/svn-archive/archive.git] / target / linux / xburst / patches-2.6.37 / 102-gpio-charger.patch
1 From 27681cf969174af00e63d572f257e2155bb914be Mon Sep 17 00:00:00 2001
2 From: Lars-Peter Clausen <lars@metafoo.de>
3 Date: Sat, 24 Apr 2010 12:29:31 +0200
4 Subject: [PATCH 04/23] Add gpio chager driver
5
6 ---
7 drivers/power/Kconfig | 7 ++
8 drivers/power/Makefile | 1 +
9 drivers/power/gpio-charger.c | 185 ++++++++++++++++++++++++++++++++++++
10 include/linux/power/gpio-charger.h | 28 ++++++
11 4 files changed, 221 insertions(+), 0 deletions(-)
12 create mode 100644 drivers/power/gpio-charger.c
13 create mode 100644 include/linux/power/gpio-charger.h
14
15 --- a/drivers/power/Kconfig
16 +++ b/drivers/power/Kconfig
17 @@ -185,4 +185,11 @@ config CHARGER_TWL4030
18 help
19 Say Y here to enable support for TWL4030 Battery Charge Interface.
20
21 +config CHARGER_GPIO
22 + tristate "GPIO charger"
23 + depends on GPIOLIB
24 + help
25 + Say Y to include support for chargers indicating their status through
26 + a GPIO pin.
27 +
28 endif # POWER_SUPPLY
29 --- a/drivers/power/Makefile
30 +++ b/drivers/power/Makefile
31 @@ -32,3 +32,4 @@ obj-$(CONFIG_BATTERY_JZ4740) += jz4740-b
32 obj-$(CONFIG_BATTERY_INTEL_MID) += intel_mid_battery.o
33 obj-$(CONFIG_CHARGER_ISP1704) += isp1704_charger.o
34 obj-$(CONFIG_CHARGER_TWL4030) += twl4030_charger.o
35 +obj-$(CONFIG_CHARGER_GPIO) += gpio-charger.o
36 --- /dev/null
37 +++ b/drivers/power/gpio-charger.c
38 @@ -0,0 +1,185 @@
39 +/*
40 + * Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
41 + * Driver for chargers indicating their status through a GPIO pin
42 + *
43 + * This program is free software; you can redistribute it and/or modify it
44 + * under the terms of the GNU General Public License as published by the
45 + * Free Software Foundation; either version 2 of the License, or (at your
46 + * option) any later version.
47 + *
48 + * You should have received a copy of the GNU General Public License along
49 + * with this program; if not, write to the Free Software Foundation, Inc.,
50 + * 675 Mass Ave, Cambridge, MA 02139, USA.
51 + *
52 + */
53 +
54 +#include <linux/device.h>
55 +#include <linux/gpio.h>
56 +#include <linux/init.h>
57 +#include <linux/interrupt.h>
58 +#include <linux/kernel.h>
59 +#include <linux/module.h>
60 +#include <linux/platform_device.h>
61 +#include <linux/power_supply.h>
62 +#include <linux/slab.h>
63 +#include <linux/types.h>
64 +
65 +#include <linux/power/gpio-charger.h>
66 +
67 +struct gpio_charger {
68 + const struct gpio_charger_platform_data *pdata;
69 +
70 + int irq;
71 +
72 + struct power_supply charger;
73 +};
74 +
75 +static irqreturn_t gpio_charger_irq(int irq, void *devid)
76 +{
77 + struct power_supply *charger = devid;
78 + power_supply_changed(charger);
79 +
80 + return IRQ_HANDLED;
81 +}
82 +
83 +static inline struct gpio_charger *psy_to_gpio_charger(struct power_supply *psy)
84 +{
85 + return container_of(psy, struct gpio_charger, charger);
86 +}
87 +
88 +static int gpio_charger_get_property(struct power_supply *psy,
89 + enum power_supply_property psp, union power_supply_propval *val)
90 +{
91 + struct gpio_charger *gpio_charger = psy_to_gpio_charger(psy);
92 + const struct gpio_charger_platform_data *pdata = gpio_charger->pdata;
93 +
94 + switch (psp) {
95 + case POWER_SUPPLY_PROP_ONLINE:
96 + val->intval = gpio_get_value(pdata->gpio);
97 + val->intval ^= pdata->gpio_active_low;
98 + break;
99 + default:
100 + return -EINVAL;
101 + }
102 +
103 + return 0;
104 +}
105 +
106 +static enum power_supply_property gpio_charger_properties[] = {
107 + POWER_SUPPLY_PROP_ONLINE,
108 +};
109 +
110 +static int __devinit gpio_charger_probe(struct platform_device *pdev)
111 +{
112 + const struct gpio_charger_platform_data *pdata = pdev->dev.platform_data;
113 + struct gpio_charger *gpio_charger;
114 + struct power_supply *charger;
115 + int ret;
116 +
117 + if (!pdata) {
118 + dev_err(&pdev->dev, "No platform data");
119 + return -EINVAL;
120 + }
121 +
122 + gpio_charger = kzalloc(sizeof(*gpio_charger), GFP_KERNEL);
123 +
124 + charger = &gpio_charger->charger;
125 +
126 + charger->name = pdata->name;
127 + charger->type = pdata->type;
128 + charger->properties = gpio_charger_properties;
129 + charger->num_properties = ARRAY_SIZE(gpio_charger_properties);
130 + charger->get_property = gpio_charger_get_property;
131 + charger->supplied_to = pdata->batteries;
132 + charger->num_supplicants = pdata->num_batteries;
133 +
134 + if (gpio_is_valid(pdata->gpio)) {
135 + ret = gpio_request(pdata->gpio, dev_name(&pdev->dev));
136 + if (ret) {
137 + dev_err(&pdev->dev, "Failed to request gpio pin: %d\n", ret);
138 + goto err;
139 + }
140 + ret = gpio_direction_input(pdata->gpio);
141 + if (ret) {
142 + dev_err(&pdev->dev, "Failed to set gpio to input: %d\n", ret);
143 + goto err_gpio_free;
144 + }
145 +
146 + gpio_charger->irq = gpio_to_irq(pdata->gpio);
147 + if (gpio_charger->irq >= 0) {
148 + ret = request_irq(gpio_charger->irq, gpio_charger_irq,
149 + IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
150 + dev_name(&pdev->dev), charger);
151 + if (ret) {
152 + dev_warn(&pdev->dev, "Failed to request online gpio irq: %d\n", ret);
153 + gpio_charger->irq = -1;
154 + }
155 + }
156 + }
157 +
158 + gpio_charger->pdata = pdata;
159 +
160 + ret = power_supply_register(&pdev->dev, charger);
161 + if (ret < 0) {
162 + dev_err(&pdev->dev, "Failed to register power supply: %d\n", ret);
163 + goto err_gpio_free;
164 + }
165 +
166 + platform_set_drvdata(pdev, gpio_charger);
167 +
168 + return 0;
169 +
170 +err_gpio_free:
171 + if (gpio_is_valid(pdata->gpio)) {
172 + if (gpio_charger->irq >= 0)
173 + free_irq(gpio_charger->irq, charger);
174 + gpio_free(pdata->gpio);
175 + }
176 +err:
177 + return ret;
178 +}
179 +
180 +static int __devexit gpio_charger_remove(struct platform_device *pdev)
181 +{
182 + struct gpio_charger *gpio_charger = platform_get_drvdata(pdev);
183 + const struct gpio_charger_platform_data *pdata = gpio_charger->pdata;
184 +
185 + power_supply_unregister(&gpio_charger->charger);
186 +
187 + if (gpio_is_valid(pdata->gpio)) {
188 + if (gpio_charger->irq >= 0)
189 + free_irq(gpio_charger->irq, &gpio_charger->charger);
190 + gpio_free(pdata->gpio);
191 + }
192 +
193 + platform_set_drvdata(pdev, NULL);
194 + kfree(gpio_charger);
195 +
196 + return 0;
197 +}
198 +
199 +static struct platform_driver gpio_charger_driver = {
200 + .probe = gpio_charger_probe,
201 + .remove = __devexit_p(gpio_charger_remove),
202 + .driver = {
203 + .name = "gpio-charger",
204 + .owner = THIS_MODULE,
205 + },
206 +};
207 +
208 +static int __init gpio_charger_init(void)
209 +{
210 + return platform_driver_register(&gpio_charger_driver);
211 +}
212 +module_init(gpio_charger_init);
213 +
214 +static void __exit gpio_charger_exit(void)
215 +{
216 + platform_driver_unregister(&gpio_charger_driver);
217 +}
218 +module_exit(gpio_charger_exit);
219 +
220 +MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
221 +MODULE_DESCRIPTION("Driver for chargers indicating their status through a gpio");
222 +MODULE_LICENSE("GPL");
223 +MODULE_ALIAS("platform:gpio-charger");
224 --- /dev/null
225 +++ b/include/linux/power/gpio-charger.h
226 @@ -0,0 +1,28 @@
227 +/*
228 + * Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
229 + *
230 + * This program is free software; you can redistribute it and/or modify it
231 + * under the terms of the GNU General Public License as published by the
232 + * Free Software Foundation; either version 2 of the License, or (at your
233 + * option) any later version.
234 + *
235 + * You should have received a copy of the GNU General Public License along
236 + * with this program; if not, write to the Free Software Foundation, Inc.,
237 + * 675 Mass Ave, Cambridge, MA 02139, USA.
238 + *
239 + */
240 +
241 +#ifndef __LINUX_POWER_GPIO_CHARGER_H__
242 +#define __LINUX_POWER_GPIO_CHARGER_H__
243 +
244 +struct gpio_charger_platform_data {
245 + const char *name;
246 + enum power_supply_type type;
247 + int gpio;
248 + int gpio_active_low;
249 +
250 + char **batteries;
251 + size_t num_batteries;
252 +};
253 +
254 +#endif