Root/target/linux/xburst/patches-2.6.36/102-gpio-charger.patch

1From fdb92490f76e1fd9292c9e967ab8d636cdbb087c Mon Sep 17 00:00:00 2001
2From: Lars-Peter Clausen <lars@metafoo.de>
3Date: Sat, 24 Apr 2010 12:29:31 +0200
4Subject: [PATCH] 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@@ -166,4 +166,11 @@ config BATTERY_INTEL_MID
18       Say Y here to enable the battery driver on Intel MID
19       platforms.
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@@ -37,3 +37,4 @@ obj-$(CONFIG_BATTERY_S3C_ADC) += s3c_adc
32 obj-$(CONFIG_CHARGER_PCF50633) += pcf50633-charger.o
33 obj-$(CONFIG_BATTERY_JZ4740) += jz4740-battery.o
34 obj-$(CONFIG_BATTERY_INTEL_MID) += intel_mid_battery.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
255

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