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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; | |
31 | ||
32 | struct power_supply charger; | |
33 | }; | |
34 | ||
35 | static irqreturn_t gpio_charger_irq(int irq, void *devid) | |
36 | { | |
37 | struct power_supply *charger = devid; | |
38 | ||
39 | power_supply_changed(charger); | |
40 | ||
41 | return IRQ_HANDLED; | |
42 | } | |
43 | ||
44 | static inline struct gpio_charger *psy_to_gpio_charger(struct power_supply *psy) | |
45 | { | |
46 | return container_of(psy, struct gpio_charger, charger); | |
47 | } | |
48 | ||
49 | static int gpio_charger_get_property(struct power_supply *psy, | |
50 | enum power_supply_property psp, union power_supply_propval *val) | |
51 | { | |
52 | struct gpio_charger *gpio_charger = psy_to_gpio_charger(psy); | |
53 | const struct gpio_charger_platform_data *pdata = gpio_charger->pdata; | |
54 | ||
55 | switch (psp) { | |
56 | case POWER_SUPPLY_PROP_ONLINE: | |
ecb7a8eb | 57 | val->intval = gpio_get_value_cansleep(pdata->gpio); |
5070437c LPC |
58 | val->intval ^= pdata->gpio_active_low; |
59 | break; | |
60 | default: | |
61 | return -EINVAL; | |
62 | } | |
63 | ||
64 | return 0; | |
65 | } | |
66 | ||
67 | static enum power_supply_property gpio_charger_properties[] = { | |
68 | POWER_SUPPLY_PROP_ONLINE, | |
69 | }; | |
70 | ||
c8afa640 | 71 | static int gpio_charger_probe(struct platform_device *pdev) |
5070437c LPC |
72 | { |
73 | const struct gpio_charger_platform_data *pdata = pdev->dev.platform_data; | |
74 | struct gpio_charger *gpio_charger; | |
75 | struct power_supply *charger; | |
76 | int ret; | |
77 | int irq; | |
78 | ||
79 | if (!pdata) { | |
80 | dev_err(&pdev->dev, "No platform data\n"); | |
81 | return -EINVAL; | |
82 | } | |
83 | ||
84 | if (!gpio_is_valid(pdata->gpio)) { | |
85 | dev_err(&pdev->dev, "Invalid gpio pin\n"); | |
86 | return -EINVAL; | |
87 | } | |
88 | ||
b92ff855 JH |
89 | gpio_charger = devm_kzalloc(&pdev->dev, sizeof(*gpio_charger), |
90 | GFP_KERNEL); | |
2e9ff5f5 LPC |
91 | if (!gpio_charger) { |
92 | dev_err(&pdev->dev, "Failed to alloc driver structure\n"); | |
93 | return -ENOMEM; | |
94 | } | |
5070437c LPC |
95 | |
96 | charger = &gpio_charger->charger; | |
97 | ||
80577b8a | 98 | charger->name = pdata->name ? pdata->name : "gpio-charger"; |
5070437c LPC |
99 | charger->type = pdata->type; |
100 | charger->properties = gpio_charger_properties; | |
101 | charger->num_properties = ARRAY_SIZE(gpio_charger_properties); | |
26eb3872 | 102 | charger->get_property = gpio_charger_get_property; |
5070437c LPC |
103 | charger->supplied_to = pdata->supplied_to; |
104 | charger->num_supplicants = pdata->num_supplicants; | |
105 | ||
106 | ret = gpio_request(pdata->gpio, dev_name(&pdev->dev)); | |
107 | if (ret) { | |
108 | dev_err(&pdev->dev, "Failed to request gpio pin: %d\n", ret); | |
109 | goto err_free; | |
110 | } | |
111 | ret = gpio_direction_input(pdata->gpio); | |
112 | if (ret) { | |
113 | dev_err(&pdev->dev, "Failed to set gpio to input: %d\n", ret); | |
114 | goto err_gpio_free; | |
115 | } | |
116 | ||
26eb3872 LPC |
117 | gpio_charger->pdata = pdata; |
118 | ||
119 | ret = power_supply_register(&pdev->dev, charger); | |
120 | if (ret < 0) { | |
121 | dev_err(&pdev->dev, "Failed to register power supply: %d\n", | |
122 | ret); | |
123 | goto err_gpio_free; | |
124 | } | |
125 | ||
5070437c LPC |
126 | irq = gpio_to_irq(pdata->gpio); |
127 | if (irq > 0) { | |
26eb3872 | 128 | ret = request_any_context_irq(irq, gpio_charger_irq, |
5070437c LPC |
129 | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, |
130 | dev_name(&pdev->dev), charger); | |
f8c63918 | 131 | if (ret < 0) |
5070437c LPC |
132 | dev_warn(&pdev->dev, "Failed to request irq: %d\n", ret); |
133 | else | |
134 | gpio_charger->irq = irq; | |
135 | } | |
136 | ||
5070437c LPC |
137 | platform_set_drvdata(pdev, gpio_charger); |
138 | ||
139 | return 0; | |
140 | ||
5070437c LPC |
141 | err_gpio_free: |
142 | gpio_free(pdata->gpio); | |
143 | err_free: | |
5070437c LPC |
144 | return ret; |
145 | } | |
146 | ||
415ec69f | 147 | static int gpio_charger_remove(struct platform_device *pdev) |
5070437c LPC |
148 | { |
149 | struct gpio_charger *gpio_charger = platform_get_drvdata(pdev); | |
150 | ||
5070437c LPC |
151 | if (gpio_charger->irq) |
152 | free_irq(gpio_charger->irq, &gpio_charger->charger); | |
26eb3872 LPC |
153 | |
154 | power_supply_unregister(&gpio_charger->charger); | |
155 | ||
5070437c LPC |
156 | gpio_free(gpio_charger->pdata->gpio); |
157 | ||
5070437c LPC |
158 | return 0; |
159 | } | |
160 | ||
f10513de BL |
161 | #ifdef CONFIG_PM_SLEEP |
162 | static int gpio_charger_resume(struct device *dev) | |
163 | { | |
164 | struct platform_device *pdev = to_platform_device(dev); | |
165 | struct gpio_charger *gpio_charger = platform_get_drvdata(pdev); | |
166 | ||
167 | power_supply_changed(&gpio_charger->charger); | |
168 | ||
169 | return 0; | |
170 | } | |
171 | #endif | |
172 | ||
173 | static SIMPLE_DEV_PM_OPS(gpio_charger_pm_ops, NULL, gpio_charger_resume); | |
174 | ||
5070437c LPC |
175 | static struct platform_driver gpio_charger_driver = { |
176 | .probe = gpio_charger_probe, | |
28ea73f4 | 177 | .remove = gpio_charger_remove, |
5070437c LPC |
178 | .driver = { |
179 | .name = "gpio-charger", | |
180 | .owner = THIS_MODULE, | |
f10513de | 181 | .pm = &gpio_charger_pm_ops, |
5070437c LPC |
182 | }, |
183 | }; | |
184 | ||
300bac7f | 185 | module_platform_driver(gpio_charger_driver); |
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186 | |
187 | MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>"); | |
188 | MODULE_DESCRIPTION("Driver for chargers which report their online status through a GPIO"); | |
189 | MODULE_LICENSE("GPL"); | |
190 | MODULE_ALIAS("platform:gpio-charger"); |