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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> | |
c8dd9cce HS |
25 | #include <linux/of.h> |
26 | #include <linux/of_gpio.h> | |
5070437c LPC |
27 | |
28 | #include <linux/power/gpio-charger.h> | |
29 | ||
30 | struct gpio_charger { | |
31 | const struct gpio_charger_platform_data *pdata; | |
32 | unsigned int irq; | |
4ea81266 | 33 | bool wakeup_enabled; |
5070437c LPC |
34 | |
35 | struct power_supply charger; | |
36 | }; | |
37 | ||
38 | static irqreturn_t gpio_charger_irq(int irq, void *devid) | |
39 | { | |
40 | struct power_supply *charger = devid; | |
41 | ||
42 | power_supply_changed(charger); | |
43 | ||
44 | return IRQ_HANDLED; | |
45 | } | |
46 | ||
47 | static inline struct gpio_charger *psy_to_gpio_charger(struct power_supply *psy) | |
48 | { | |
49 | return container_of(psy, struct gpio_charger, charger); | |
50 | } | |
51 | ||
52 | static int gpio_charger_get_property(struct power_supply *psy, | |
53 | enum power_supply_property psp, union power_supply_propval *val) | |
54 | { | |
55 | struct gpio_charger *gpio_charger = psy_to_gpio_charger(psy); | |
56 | const struct gpio_charger_platform_data *pdata = gpio_charger->pdata; | |
57 | ||
58 | switch (psp) { | |
59 | case POWER_SUPPLY_PROP_ONLINE: | |
4d96fb1e | 60 | val->intval = !!gpio_get_value_cansleep(pdata->gpio); |
5070437c LPC |
61 | val->intval ^= pdata->gpio_active_low; |
62 | break; | |
63 | default: | |
64 | return -EINVAL; | |
65 | } | |
66 | ||
67 | return 0; | |
68 | } | |
69 | ||
70 | static enum power_supply_property gpio_charger_properties[] = { | |
71 | POWER_SUPPLY_PROP_ONLINE, | |
72 | }; | |
73 | ||
c8dd9cce HS |
74 | static |
75 | struct gpio_charger_platform_data *gpio_charger_parse_dt(struct device *dev) | |
76 | { | |
77 | struct device_node *np = dev->of_node; | |
78 | struct gpio_charger_platform_data *pdata; | |
79 | const char *chargetype; | |
80 | enum of_gpio_flags flags; | |
81 | int ret; | |
82 | ||
83 | if (!np) | |
84 | return ERR_PTR(-ENOENT); | |
85 | ||
86 | pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); | |
87 | if (!pdata) | |
88 | return ERR_PTR(-ENOMEM); | |
89 | ||
90 | pdata->name = np->name; | |
91 | ||
92 | pdata->gpio = of_get_gpio_flags(np, 0, &flags); | |
93 | if (pdata->gpio < 0) { | |
94 | if (pdata->gpio != -EPROBE_DEFER) | |
95 | dev_err(dev, "could not get charger gpio\n"); | |
96 | return ERR_PTR(pdata->gpio); | |
97 | } | |
98 | ||
99 | pdata->gpio_active_low = !!(flags & OF_GPIO_ACTIVE_LOW); | |
100 | ||
101 | pdata->type = POWER_SUPPLY_TYPE_UNKNOWN; | |
102 | ret = of_property_read_string(np, "charger-type", &chargetype); | |
103 | if (ret >= 0) { | |
104 | if (!strncmp("unknown", chargetype, 7)) | |
105 | pdata->type = POWER_SUPPLY_TYPE_UNKNOWN; | |
106 | else if (!strncmp("battery", chargetype, 7)) | |
107 | pdata->type = POWER_SUPPLY_TYPE_BATTERY; | |
108 | else if (!strncmp("ups", chargetype, 3)) | |
109 | pdata->type = POWER_SUPPLY_TYPE_UPS; | |
110 | else if (!strncmp("mains", chargetype, 5)) | |
111 | pdata->type = POWER_SUPPLY_TYPE_MAINS; | |
112 | else if (!strncmp("usb-sdp", chargetype, 7)) | |
113 | pdata->type = POWER_SUPPLY_TYPE_USB; | |
114 | else if (!strncmp("usb-dcp", chargetype, 7)) | |
115 | pdata->type = POWER_SUPPLY_TYPE_USB_DCP; | |
116 | else if (!strncmp("usb-cdp", chargetype, 7)) | |
117 | pdata->type = POWER_SUPPLY_TYPE_USB_CDP; | |
118 | else if (!strncmp("usb-aca", chargetype, 7)) | |
119 | pdata->type = POWER_SUPPLY_TYPE_USB_ACA; | |
120 | else | |
121 | dev_warn(dev, "unknown charger type %s\n", chargetype); | |
122 | } | |
123 | ||
124 | return pdata; | |
125 | } | |
126 | ||
c8afa640 | 127 | static int gpio_charger_probe(struct platform_device *pdev) |
5070437c LPC |
128 | { |
129 | const struct gpio_charger_platform_data *pdata = pdev->dev.platform_data; | |
130 | struct gpio_charger *gpio_charger; | |
131 | struct power_supply *charger; | |
132 | int ret; | |
133 | int irq; | |
134 | ||
135 | if (!pdata) { | |
c8dd9cce HS |
136 | pdata = gpio_charger_parse_dt(&pdev->dev); |
137 | if (IS_ERR(pdata)) { | |
138 | ret = PTR_ERR(pdata); | |
139 | if (ret != -EPROBE_DEFER) | |
140 | dev_err(&pdev->dev, "No platform data\n"); | |
141 | return ret; | |
142 | } | |
5070437c LPC |
143 | } |
144 | ||
145 | if (!gpio_is_valid(pdata->gpio)) { | |
146 | dev_err(&pdev->dev, "Invalid gpio pin\n"); | |
147 | return -EINVAL; | |
148 | } | |
149 | ||
b92ff855 JH |
150 | gpio_charger = devm_kzalloc(&pdev->dev, sizeof(*gpio_charger), |
151 | GFP_KERNEL); | |
2e9ff5f5 LPC |
152 | if (!gpio_charger) { |
153 | dev_err(&pdev->dev, "Failed to alloc driver structure\n"); | |
154 | return -ENOMEM; | |
155 | } | |
5070437c LPC |
156 | |
157 | charger = &gpio_charger->charger; | |
158 | ||
80577b8a | 159 | charger->name = pdata->name ? pdata->name : "gpio-charger"; |
5070437c LPC |
160 | charger->type = pdata->type; |
161 | charger->properties = gpio_charger_properties; | |
162 | charger->num_properties = ARRAY_SIZE(gpio_charger_properties); | |
26eb3872 | 163 | charger->get_property = gpio_charger_get_property; |
5070437c LPC |
164 | charger->supplied_to = pdata->supplied_to; |
165 | charger->num_supplicants = pdata->num_supplicants; | |
c8dd9cce | 166 | charger->of_node = pdev->dev.of_node; |
5070437c LPC |
167 | |
168 | ret = gpio_request(pdata->gpio, dev_name(&pdev->dev)); | |
169 | if (ret) { | |
170 | dev_err(&pdev->dev, "Failed to request gpio pin: %d\n", ret); | |
171 | goto err_free; | |
172 | } | |
173 | ret = gpio_direction_input(pdata->gpio); | |
174 | if (ret) { | |
175 | dev_err(&pdev->dev, "Failed to set gpio to input: %d\n", ret); | |
176 | goto err_gpio_free; | |
177 | } | |
178 | ||
26eb3872 LPC |
179 | gpio_charger->pdata = pdata; |
180 | ||
181 | ret = power_supply_register(&pdev->dev, charger); | |
182 | if (ret < 0) { | |
183 | dev_err(&pdev->dev, "Failed to register power supply: %d\n", | |
184 | ret); | |
185 | goto err_gpio_free; | |
186 | } | |
187 | ||
5070437c LPC |
188 | irq = gpio_to_irq(pdata->gpio); |
189 | if (irq > 0) { | |
26eb3872 | 190 | ret = request_any_context_irq(irq, gpio_charger_irq, |
5070437c LPC |
191 | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, |
192 | dev_name(&pdev->dev), charger); | |
f8c63918 | 193 | if (ret < 0) |
5070437c LPC |
194 | dev_warn(&pdev->dev, "Failed to request irq: %d\n", ret); |
195 | else | |
196 | gpio_charger->irq = irq; | |
197 | } | |
198 | ||
5070437c LPC |
199 | platform_set_drvdata(pdev, gpio_charger); |
200 | ||
4ea81266 DES |
201 | device_init_wakeup(&pdev->dev, 1); |
202 | ||
5070437c LPC |
203 | return 0; |
204 | ||
5070437c LPC |
205 | err_gpio_free: |
206 | gpio_free(pdata->gpio); | |
207 | err_free: | |
5070437c LPC |
208 | return ret; |
209 | } | |
210 | ||
415ec69f | 211 | static int gpio_charger_remove(struct platform_device *pdev) |
5070437c LPC |
212 | { |
213 | struct gpio_charger *gpio_charger = platform_get_drvdata(pdev); | |
214 | ||
5070437c LPC |
215 | if (gpio_charger->irq) |
216 | free_irq(gpio_charger->irq, &gpio_charger->charger); | |
26eb3872 LPC |
217 | |
218 | power_supply_unregister(&gpio_charger->charger); | |
219 | ||
5070437c LPC |
220 | gpio_free(gpio_charger->pdata->gpio); |
221 | ||
5070437c LPC |
222 | return 0; |
223 | } | |
224 | ||
f10513de | 225 | #ifdef CONFIG_PM_SLEEP |
4ea81266 DES |
226 | static int gpio_charger_suspend(struct device *dev) |
227 | { | |
228 | struct gpio_charger *gpio_charger = dev_get_drvdata(dev); | |
229 | ||
230 | if (device_may_wakeup(dev)) | |
231 | gpio_charger->wakeup_enabled = | |
faeed51b | 232 | !enable_irq_wake(gpio_charger->irq); |
4ea81266 DES |
233 | |
234 | return 0; | |
235 | } | |
236 | ||
f10513de BL |
237 | static int gpio_charger_resume(struct device *dev) |
238 | { | |
239 | struct platform_device *pdev = to_platform_device(dev); | |
240 | struct gpio_charger *gpio_charger = platform_get_drvdata(pdev); | |
241 | ||
faeed51b | 242 | if (device_may_wakeup(dev) && gpio_charger->wakeup_enabled) |
4ea81266 | 243 | disable_irq_wake(gpio_charger->irq); |
f10513de BL |
244 | power_supply_changed(&gpio_charger->charger); |
245 | ||
246 | return 0; | |
247 | } | |
248 | #endif | |
249 | ||
4ea81266 DES |
250 | static SIMPLE_DEV_PM_OPS(gpio_charger_pm_ops, |
251 | gpio_charger_suspend, gpio_charger_resume); | |
f10513de | 252 | |
c8dd9cce HS |
253 | static const struct of_device_id gpio_charger_match[] = { |
254 | { .compatible = "gpio-charger" }, | |
255 | { } | |
256 | }; | |
257 | MODULE_DEVICE_TABLE(of, gpio_charger_match); | |
258 | ||
5070437c LPC |
259 | static struct platform_driver gpio_charger_driver = { |
260 | .probe = gpio_charger_probe, | |
28ea73f4 | 261 | .remove = gpio_charger_remove, |
5070437c LPC |
262 | .driver = { |
263 | .name = "gpio-charger", | |
f10513de | 264 | .pm = &gpio_charger_pm_ops, |
c8dd9cce | 265 | .of_match_table = gpio_charger_match, |
5070437c LPC |
266 | }, |
267 | }; | |
268 | ||
300bac7f | 269 | module_platform_driver(gpio_charger_driver); |
5070437c LPC |
270 | |
271 | MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>"); | |
272 | MODULE_DESCRIPTION("Driver for chargers which report their online status through a GPIO"); | |
273 | MODULE_LICENSE("GPL"); | |
274 | MODULE_ALIAS("platform:gpio-charger"); |