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5070437c LPC |
1 | /* |
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 | ||
28 | struct gpio_charger { | |
29 | const struct gpio_charger_platform_data *pdata; | |
30 | unsigned int irq; | |
4ea81266 | 31 | bool wakeup_enabled; |
5070437c LPC |
32 | |
33 | struct power_supply charger; | |
34 | }; | |
35 | ||
36 | static 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 | ||
45 | static inline struct gpio_charger *psy_to_gpio_charger(struct power_supply *psy) | |
46 | { | |
47 | return container_of(psy, struct gpio_charger, charger); | |
48 | } | |
49 | ||
50 | static 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: | |
ecb7a8eb | 58 | val->intval = gpio_get_value_cansleep(pdata->gpio); |
5070437c LPC |
59 | val->intval ^= pdata->gpio_active_low; |
60 | break; | |
61 | default: | |
62 | return -EINVAL; | |
63 | } | |
64 | ||
65 | return 0; | |
66 | } | |
67 | ||
68 | static enum power_supply_property gpio_charger_properties[] = { | |
69 | POWER_SUPPLY_PROP_ONLINE, | |
70 | }; | |
71 | ||
c8afa640 | 72 | static int gpio_charger_probe(struct platform_device *pdev) |
5070437c LPC |
73 | { |
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 | ||
b92ff855 JH |
90 | gpio_charger = devm_kzalloc(&pdev->dev, sizeof(*gpio_charger), |
91 | GFP_KERNEL); | |
2e9ff5f5 LPC |
92 | if (!gpio_charger) { |
93 | dev_err(&pdev->dev, "Failed to alloc driver structure\n"); | |
94 | return -ENOMEM; | |
95 | } | |
5070437c LPC |
96 | |
97 | charger = &gpio_charger->charger; | |
98 | ||
80577b8a | 99 | charger->name = pdata->name ? pdata->name : "gpio-charger"; |
5070437c LPC |
100 | charger->type = pdata->type; |
101 | charger->properties = gpio_charger_properties; | |
102 | charger->num_properties = ARRAY_SIZE(gpio_charger_properties); | |
26eb3872 | 103 | charger->get_property = gpio_charger_get_property; |
5070437c LPC |
104 | 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 | ||
26eb3872 LPC |
118 | 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 | ||
5070437c LPC |
127 | irq = gpio_to_irq(pdata->gpio); |
128 | if (irq > 0) { | |
26eb3872 | 129 | ret = request_any_context_irq(irq, gpio_charger_irq, |
5070437c LPC |
130 | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, |
131 | dev_name(&pdev->dev), charger); | |
f8c63918 | 132 | if (ret < 0) |
5070437c LPC |
133 | dev_warn(&pdev->dev, "Failed to request irq: %d\n", ret); |
134 | else | |
135 | gpio_charger->irq = irq; | |
136 | } | |
137 | ||
5070437c LPC |
138 | platform_set_drvdata(pdev, gpio_charger); |
139 | ||
4ea81266 DES |
140 | device_init_wakeup(&pdev->dev, 1); |
141 | ||
5070437c LPC |
142 | return 0; |
143 | ||
5070437c LPC |
144 | err_gpio_free: |
145 | gpio_free(pdata->gpio); | |
146 | err_free: | |
5070437c LPC |
147 | return ret; |
148 | } | |
149 | ||
415ec69f | 150 | static int gpio_charger_remove(struct platform_device *pdev) |
5070437c LPC |
151 | { |
152 | struct gpio_charger *gpio_charger = platform_get_drvdata(pdev); | |
153 | ||
5070437c LPC |
154 | if (gpio_charger->irq) |
155 | free_irq(gpio_charger->irq, &gpio_charger->charger); | |
26eb3872 LPC |
156 | |
157 | power_supply_unregister(&gpio_charger->charger); | |
158 | ||
5070437c LPC |
159 | gpio_free(gpio_charger->pdata->gpio); |
160 | ||
5070437c LPC |
161 | return 0; |
162 | } | |
163 | ||
f10513de | 164 | #ifdef CONFIG_PM_SLEEP |
4ea81266 DES |
165 | static 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 | ||
f10513de BL |
176 | static 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 | ||
4ea81266 DES |
181 | if (gpio_charger->wakeup_enabled) |
182 | disable_irq_wake(gpio_charger->irq); | |
f10513de BL |
183 | power_supply_changed(&gpio_charger->charger); |
184 | ||
185 | return 0; | |
186 | } | |
187 | #endif | |
188 | ||
4ea81266 DES |
189 | static SIMPLE_DEV_PM_OPS(gpio_charger_pm_ops, |
190 | gpio_charger_suspend, gpio_charger_resume); | |
f10513de | 191 | |
5070437c LPC |
192 | static struct platform_driver gpio_charger_driver = { |
193 | .probe = gpio_charger_probe, | |
28ea73f4 | 194 | .remove = gpio_charger_remove, |
5070437c LPC |
195 | .driver = { |
196 | .name = "gpio-charger", | |
197 | .owner = THIS_MODULE, | |
f10513de | 198 | .pm = &gpio_charger_pm_ops, |
5070437c LPC |
199 | }, |
200 | }; | |
201 | ||
300bac7f | 202 | module_platform_driver(gpio_charger_driver); |
5070437c LPC |
203 | |
204 | MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>"); | |
205 | MODULE_DESCRIPTION("Driver for chargers which report their online status through a GPIO"); | |
206 | MODULE_LICENSE("GPL"); | |
207 | MODULE_ALIAS("platform:gpio-charger"); |