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Lars-Peter Clausen50704372010-10-21 17:55:01 +02001/*
2 * Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
3 * Driver for chargers which report their online status through a GPIO pin
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; either version 2 of the License, or (at your
8 * option) any later version.
9 *
10 * You should have received a copy of the GNU General Public License along
11 * with this program; if not, write to the Free Software Foundation, Inc.,
12 * 675 Mass Ave, Cambridge, MA 02139, USA.
13 *
14 */
15
16#include <linux/device.h>
17#include <linux/gpio.h>
18#include <linux/init.h>
19#include <linux/interrupt.h>
20#include <linux/kernel.h>
21#include <linux/module.h>
22#include <linux/platform_device.h>
23#include <linux/power_supply.h>
24#include <linux/slab.h>
25
26#include <linux/power/gpio-charger.h>
27
28struct gpio_charger {
29 const struct gpio_charger_platform_data *pdata;
30 unsigned int irq;
Dmitry Eremin-Solenikov4ea81262013-12-11 02:47:16 +040031 bool wakeup_enabled;
Lars-Peter Clausen50704372010-10-21 17:55:01 +020032
33 struct power_supply charger;
34};
35
36static irqreturn_t gpio_charger_irq(int irq, void *devid)
37{
38 struct power_supply *charger = devid;
39
40 power_supply_changed(charger);
41
42 return IRQ_HANDLED;
43}
44
45static inline struct gpio_charger *psy_to_gpio_charger(struct power_supply *psy)
46{
47 return container_of(psy, struct gpio_charger, charger);
48}
49
50static int gpio_charger_get_property(struct power_supply *psy,
51 enum power_supply_property psp, union power_supply_propval *val)
52{
53 struct gpio_charger *gpio_charger = psy_to_gpio_charger(psy);
54 const struct gpio_charger_platform_data *pdata = gpio_charger->pdata;
55
56 switch (psp) {
57 case POWER_SUPPLY_PROP_ONLINE:
Pritesh Raithathaecb7a8e2012-05-22 14:20:04 +053058 val->intval = gpio_get_value_cansleep(pdata->gpio);
Lars-Peter Clausen50704372010-10-21 17:55:01 +020059 val->intval ^= pdata->gpio_active_low;
60 break;
61 default:
62 return -EINVAL;
63 }
64
65 return 0;
66}
67
68static enum power_supply_property gpio_charger_properties[] = {
69 POWER_SUPPLY_PROP_ONLINE,
70};
71
Bill Pembertonc8afa642012-11-19 13:22:23 -050072static int gpio_charger_probe(struct platform_device *pdev)
Lars-Peter Clausen50704372010-10-21 17:55:01 +020073{
74 const struct gpio_charger_platform_data *pdata = pdev->dev.platform_data;
75 struct gpio_charger *gpio_charger;
76 struct power_supply *charger;
77 int ret;
78 int irq;
79
80 if (!pdata) {
81 dev_err(&pdev->dev, "No platform data\n");
82 return -EINVAL;
83 }
84
85 if (!gpio_is_valid(pdata->gpio)) {
86 dev_err(&pdev->dev, "Invalid gpio pin\n");
87 return -EINVAL;
88 }
89
Jingoo Hanb92ff852013-03-11 15:33:27 +090090 gpio_charger = devm_kzalloc(&pdev->dev, sizeof(*gpio_charger),
91 GFP_KERNEL);
Lars-Peter Clausen2e9ff5f2010-11-18 23:08:37 +010092 if (!gpio_charger) {
93 dev_err(&pdev->dev, "Failed to alloc driver structure\n");
94 return -ENOMEM;
95 }
Lars-Peter Clausen50704372010-10-21 17:55:01 +020096
97 charger = &gpio_charger->charger;
98
Lars-Peter Clausen80577b8a42010-11-18 23:08:39 +010099 charger->name = pdata->name ? pdata->name : "gpio-charger";
Lars-Peter Clausen50704372010-10-21 17:55:01 +0200100 charger->type = pdata->type;
101 charger->properties = gpio_charger_properties;
102 charger->num_properties = ARRAY_SIZE(gpio_charger_properties);
Lars-Peter Clausen26eb3872010-11-18 23:08:38 +0100103 charger->get_property = gpio_charger_get_property;
Lars-Peter Clausen50704372010-10-21 17:55:01 +0200104 charger->supplied_to = pdata->supplied_to;
105 charger->num_supplicants = pdata->num_supplicants;
106
107 ret = gpio_request(pdata->gpio, dev_name(&pdev->dev));
108 if (ret) {
109 dev_err(&pdev->dev, "Failed to request gpio pin: %d\n", ret);
110 goto err_free;
111 }
112 ret = gpio_direction_input(pdata->gpio);
113 if (ret) {
114 dev_err(&pdev->dev, "Failed to set gpio to input: %d\n", ret);
115 goto err_gpio_free;
116 }
117
Lars-Peter Clausen26eb3872010-11-18 23:08:38 +0100118 gpio_charger->pdata = pdata;
119
120 ret = power_supply_register(&pdev->dev, charger);
121 if (ret < 0) {
122 dev_err(&pdev->dev, "Failed to register power supply: %d\n",
123 ret);
124 goto err_gpio_free;
125 }
126
Lars-Peter Clausen50704372010-10-21 17:55:01 +0200127 irq = gpio_to_irq(pdata->gpio);
128 if (irq > 0) {
Lars-Peter Clausen26eb3872010-11-18 23:08:38 +0100129 ret = request_any_context_irq(irq, gpio_charger_irq,
Lars-Peter Clausen50704372010-10-21 17:55:01 +0200130 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
131 dev_name(&pdev->dev), charger);
Axel Linf8c63912011-07-04 18:04:15 +0800132 if (ret < 0)
Lars-Peter Clausen50704372010-10-21 17:55:01 +0200133 dev_warn(&pdev->dev, "Failed to request irq: %d\n", ret);
134 else
135 gpio_charger->irq = irq;
136 }
137
Lars-Peter Clausen50704372010-10-21 17:55:01 +0200138 platform_set_drvdata(pdev, gpio_charger);
139
Dmitry Eremin-Solenikov4ea81262013-12-11 02:47:16 +0400140 device_init_wakeup(&pdev->dev, 1);
141
Lars-Peter Clausen50704372010-10-21 17:55:01 +0200142 return 0;
143
Lars-Peter Clausen50704372010-10-21 17:55:01 +0200144err_gpio_free:
145 gpio_free(pdata->gpio);
146err_free:
Lars-Peter Clausen50704372010-10-21 17:55:01 +0200147 return ret;
148}
149
Bill Pemberton415ec692012-11-19 13:26:07 -0500150static int gpio_charger_remove(struct platform_device *pdev)
Lars-Peter Clausen50704372010-10-21 17:55:01 +0200151{
152 struct gpio_charger *gpio_charger = platform_get_drvdata(pdev);
153
Lars-Peter Clausen50704372010-10-21 17:55:01 +0200154 if (gpio_charger->irq)
155 free_irq(gpio_charger->irq, &gpio_charger->charger);
Lars-Peter Clausen26eb3872010-11-18 23:08:38 +0100156
157 power_supply_unregister(&gpio_charger->charger);
158
Lars-Peter Clausen50704372010-10-21 17:55:01 +0200159 gpio_free(gpio_charger->pdata->gpio);
160
Lars-Peter Clausen50704372010-10-21 17:55:01 +0200161 return 0;
162}
163
Benson Leungf10513d2011-04-06 16:55:20 -0700164#ifdef CONFIG_PM_SLEEP
Dmitry Eremin-Solenikov4ea81262013-12-11 02:47:16 +0400165static int gpio_charger_suspend(struct device *dev)
166{
167 struct gpio_charger *gpio_charger = dev_get_drvdata(dev);
168
169 if (device_may_wakeup(dev))
170 gpio_charger->wakeup_enabled =
171 enable_irq_wake(gpio_charger->irq);
172
173 return 0;
174}
175
Benson Leungf10513d2011-04-06 16:55:20 -0700176static int gpio_charger_resume(struct device *dev)
177{
178 struct platform_device *pdev = to_platform_device(dev);
179 struct gpio_charger *gpio_charger = platform_get_drvdata(pdev);
180
Dmitry Eremin-Solenikov4ea81262013-12-11 02:47:16 +0400181 if (gpio_charger->wakeup_enabled)
182 disable_irq_wake(gpio_charger->irq);
Benson Leungf10513d2011-04-06 16:55:20 -0700183 power_supply_changed(&gpio_charger->charger);
184
185 return 0;
186}
187#endif
188
Dmitry Eremin-Solenikov4ea81262013-12-11 02:47:16 +0400189static SIMPLE_DEV_PM_OPS(gpio_charger_pm_ops,
190 gpio_charger_suspend, gpio_charger_resume);
Benson Leungf10513d2011-04-06 16:55:20 -0700191
Lars-Peter Clausen50704372010-10-21 17:55:01 +0200192static struct platform_driver gpio_charger_driver = {
193 .probe = gpio_charger_probe,
Bill Pemberton28ea73f2012-11-19 13:20:40 -0500194 .remove = gpio_charger_remove,
Lars-Peter Clausen50704372010-10-21 17:55:01 +0200195 .driver = {
196 .name = "gpio-charger",
197 .owner = THIS_MODULE,
Benson Leungf10513d2011-04-06 16:55:20 -0700198 .pm = &gpio_charger_pm_ops,
Lars-Peter Clausen50704372010-10-21 17:55:01 +0200199 },
200};
201
Axel Lin300bac72011-11-26 12:01:10 +0800202module_platform_driver(gpio_charger_driver);
Lars-Peter Clausen50704372010-10-21 17:55:01 +0200203
204MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
205MODULE_DESCRIPTION("Driver for chargers which report their online status through a GPIO");
206MODULE_LICENSE("GPL");
207MODULE_ALIAS("platform:gpio-charger");