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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 | 34 | |
297d716f KK |
35 | struct power_supply *charger; |
36 | struct power_supply_desc charger_desc; | |
5070437c LPC |
37 | }; |
38 | ||
39 | static irqreturn_t gpio_charger_irq(int irq, void *devid) | |
40 | { | |
41 | struct power_supply *charger = devid; | |
42 | ||
43 | power_supply_changed(charger); | |
44 | ||
45 | return IRQ_HANDLED; | |
46 | } | |
47 | ||
48 | static inline struct gpio_charger *psy_to_gpio_charger(struct power_supply *psy) | |
49 | { | |
297d716f | 50 | return power_supply_get_drvdata(psy); |
5070437c LPC |
51 | } |
52 | ||
53 | static int gpio_charger_get_property(struct power_supply *psy, | |
54 | enum power_supply_property psp, union power_supply_propval *val) | |
55 | { | |
56 | struct gpio_charger *gpio_charger = psy_to_gpio_charger(psy); | |
57 | const struct gpio_charger_platform_data *pdata = gpio_charger->pdata; | |
58 | ||
59 | switch (psp) { | |
60 | case POWER_SUPPLY_PROP_ONLINE: | |
4d96fb1e | 61 | val->intval = !!gpio_get_value_cansleep(pdata->gpio); |
5070437c LPC |
62 | val->intval ^= pdata->gpio_active_low; |
63 | break; | |
64 | default: | |
65 | return -EINVAL; | |
66 | } | |
67 | ||
68 | return 0; | |
69 | } | |
70 | ||
71 | static enum power_supply_property gpio_charger_properties[] = { | |
72 | POWER_SUPPLY_PROP_ONLINE, | |
73 | }; | |
74 | ||
c8dd9cce HS |
75 | static |
76 | struct gpio_charger_platform_data *gpio_charger_parse_dt(struct device *dev) | |
77 | { | |
78 | struct device_node *np = dev->of_node; | |
79 | struct gpio_charger_platform_data *pdata; | |
80 | const char *chargetype; | |
81 | enum of_gpio_flags flags; | |
82 | int ret; | |
83 | ||
84 | if (!np) | |
85 | return ERR_PTR(-ENOENT); | |
86 | ||
87 | pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); | |
88 | if (!pdata) | |
89 | return ERR_PTR(-ENOMEM); | |
90 | ||
91 | pdata->name = np->name; | |
92 | ||
93 | pdata->gpio = of_get_gpio_flags(np, 0, &flags); | |
94 | if (pdata->gpio < 0) { | |
95 | if (pdata->gpio != -EPROBE_DEFER) | |
96 | dev_err(dev, "could not get charger gpio\n"); | |
97 | return ERR_PTR(pdata->gpio); | |
98 | } | |
99 | ||
100 | pdata->gpio_active_low = !!(flags & OF_GPIO_ACTIVE_LOW); | |
101 | ||
102 | pdata->type = POWER_SUPPLY_TYPE_UNKNOWN; | |
103 | ret = of_property_read_string(np, "charger-type", &chargetype); | |
104 | if (ret >= 0) { | |
105 | if (!strncmp("unknown", chargetype, 7)) | |
106 | pdata->type = POWER_SUPPLY_TYPE_UNKNOWN; | |
107 | else if (!strncmp("battery", chargetype, 7)) | |
108 | pdata->type = POWER_SUPPLY_TYPE_BATTERY; | |
109 | else if (!strncmp("ups", chargetype, 3)) | |
110 | pdata->type = POWER_SUPPLY_TYPE_UPS; | |
111 | else if (!strncmp("mains", chargetype, 5)) | |
112 | pdata->type = POWER_SUPPLY_TYPE_MAINS; | |
113 | else if (!strncmp("usb-sdp", chargetype, 7)) | |
114 | pdata->type = POWER_SUPPLY_TYPE_USB; | |
115 | else if (!strncmp("usb-dcp", chargetype, 7)) | |
116 | pdata->type = POWER_SUPPLY_TYPE_USB_DCP; | |
117 | else if (!strncmp("usb-cdp", chargetype, 7)) | |
118 | pdata->type = POWER_SUPPLY_TYPE_USB_CDP; | |
119 | else if (!strncmp("usb-aca", chargetype, 7)) | |
120 | pdata->type = POWER_SUPPLY_TYPE_USB_ACA; | |
121 | else | |
122 | dev_warn(dev, "unknown charger type %s\n", chargetype); | |
123 | } | |
124 | ||
125 | return pdata; | |
126 | } | |
127 | ||
c8afa640 | 128 | static int gpio_charger_probe(struct platform_device *pdev) |
5070437c LPC |
129 | { |
130 | const struct gpio_charger_platform_data *pdata = pdev->dev.platform_data; | |
2dc9215d | 131 | struct power_supply_config psy_cfg = {}; |
5070437c | 132 | struct gpio_charger *gpio_charger; |
297d716f | 133 | struct power_supply_desc *charger_desc; |
5070437c LPC |
134 | int ret; |
135 | int irq; | |
136 | ||
137 | if (!pdata) { | |
c8dd9cce HS |
138 | pdata = gpio_charger_parse_dt(&pdev->dev); |
139 | if (IS_ERR(pdata)) { | |
140 | ret = PTR_ERR(pdata); | |
141 | if (ret != -EPROBE_DEFER) | |
142 | dev_err(&pdev->dev, "No platform data\n"); | |
143 | return ret; | |
144 | } | |
5070437c LPC |
145 | } |
146 | ||
147 | if (!gpio_is_valid(pdata->gpio)) { | |
148 | dev_err(&pdev->dev, "Invalid gpio pin\n"); | |
149 | return -EINVAL; | |
150 | } | |
151 | ||
b92ff855 JH |
152 | gpio_charger = devm_kzalloc(&pdev->dev, sizeof(*gpio_charger), |
153 | GFP_KERNEL); | |
2e9ff5f5 LPC |
154 | if (!gpio_charger) { |
155 | dev_err(&pdev->dev, "Failed to alloc driver structure\n"); | |
156 | return -ENOMEM; | |
157 | } | |
5070437c | 158 | |
297d716f | 159 | charger_desc = &gpio_charger->charger_desc; |
5070437c | 160 | |
297d716f KK |
161 | charger_desc->name = pdata->name ? pdata->name : "gpio-charger"; |
162 | charger_desc->type = pdata->type; | |
163 | charger_desc->properties = gpio_charger_properties; | |
164 | charger_desc->num_properties = ARRAY_SIZE(gpio_charger_properties); | |
165 | charger_desc->get_property = gpio_charger_get_property; | |
2dc9215d KK |
166 | |
167 | psy_cfg.supplied_to = pdata->supplied_to; | |
168 | psy_cfg.num_supplicants = pdata->num_supplicants; | |
169 | psy_cfg.of_node = pdev->dev.of_node; | |
297d716f | 170 | psy_cfg.drv_data = gpio_charger; |
5070437c LPC |
171 | |
172 | ret = gpio_request(pdata->gpio, dev_name(&pdev->dev)); | |
173 | if (ret) { | |
174 | dev_err(&pdev->dev, "Failed to request gpio pin: %d\n", ret); | |
175 | goto err_free; | |
176 | } | |
177 | ret = gpio_direction_input(pdata->gpio); | |
178 | if (ret) { | |
179 | dev_err(&pdev->dev, "Failed to set gpio to input: %d\n", ret); | |
180 | goto err_gpio_free; | |
181 | } | |
182 | ||
26eb3872 LPC |
183 | gpio_charger->pdata = pdata; |
184 | ||
297d716f KK |
185 | gpio_charger->charger = power_supply_register(&pdev->dev, |
186 | charger_desc, &psy_cfg); | |
187 | if (IS_ERR(gpio_charger->charger)) { | |
188 | ret = PTR_ERR(gpio_charger->charger); | |
26eb3872 LPC |
189 | dev_err(&pdev->dev, "Failed to register power supply: %d\n", |
190 | ret); | |
191 | goto err_gpio_free; | |
192 | } | |
193 | ||
5070437c LPC |
194 | irq = gpio_to_irq(pdata->gpio); |
195 | if (irq > 0) { | |
26eb3872 | 196 | ret = request_any_context_irq(irq, gpio_charger_irq, |
5070437c | 197 | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, |
297d716f | 198 | dev_name(&pdev->dev), gpio_charger->charger); |
f8c63918 | 199 | if (ret < 0) |
5070437c LPC |
200 | dev_warn(&pdev->dev, "Failed to request irq: %d\n", ret); |
201 | else | |
202 | gpio_charger->irq = irq; | |
203 | } | |
204 | ||
5070437c LPC |
205 | platform_set_drvdata(pdev, gpio_charger); |
206 | ||
4ea81266 DES |
207 | device_init_wakeup(&pdev->dev, 1); |
208 | ||
5070437c LPC |
209 | return 0; |
210 | ||
5070437c LPC |
211 | err_gpio_free: |
212 | gpio_free(pdata->gpio); | |
213 | err_free: | |
5070437c LPC |
214 | return ret; |
215 | } | |
216 | ||
415ec69f | 217 | static int gpio_charger_remove(struct platform_device *pdev) |
5070437c LPC |
218 | { |
219 | struct gpio_charger *gpio_charger = platform_get_drvdata(pdev); | |
220 | ||
5070437c | 221 | if (gpio_charger->irq) |
297d716f | 222 | free_irq(gpio_charger->irq, gpio_charger->charger); |
26eb3872 | 223 | |
297d716f | 224 | power_supply_unregister(gpio_charger->charger); |
26eb3872 | 225 | |
5070437c LPC |
226 | gpio_free(gpio_charger->pdata->gpio); |
227 | ||
5070437c LPC |
228 | return 0; |
229 | } | |
230 | ||
f10513de | 231 | #ifdef CONFIG_PM_SLEEP |
4ea81266 DES |
232 | static int gpio_charger_suspend(struct device *dev) |
233 | { | |
234 | struct gpio_charger *gpio_charger = dev_get_drvdata(dev); | |
235 | ||
236 | if (device_may_wakeup(dev)) | |
237 | gpio_charger->wakeup_enabled = | |
faeed51b | 238 | !enable_irq_wake(gpio_charger->irq); |
4ea81266 DES |
239 | |
240 | return 0; | |
241 | } | |
242 | ||
f10513de BL |
243 | static int gpio_charger_resume(struct device *dev) |
244 | { | |
245 | struct platform_device *pdev = to_platform_device(dev); | |
246 | struct gpio_charger *gpio_charger = platform_get_drvdata(pdev); | |
247 | ||
faeed51b | 248 | if (device_may_wakeup(dev) && gpio_charger->wakeup_enabled) |
4ea81266 | 249 | disable_irq_wake(gpio_charger->irq); |
297d716f | 250 | power_supply_changed(gpio_charger->charger); |
f10513de BL |
251 | |
252 | return 0; | |
253 | } | |
254 | #endif | |
255 | ||
4ea81266 DES |
256 | static SIMPLE_DEV_PM_OPS(gpio_charger_pm_ops, |
257 | gpio_charger_suspend, gpio_charger_resume); | |
f10513de | 258 | |
c8dd9cce HS |
259 | static const struct of_device_id gpio_charger_match[] = { |
260 | { .compatible = "gpio-charger" }, | |
261 | { } | |
262 | }; | |
263 | MODULE_DEVICE_TABLE(of, gpio_charger_match); | |
264 | ||
5070437c LPC |
265 | static struct platform_driver gpio_charger_driver = { |
266 | .probe = gpio_charger_probe, | |
28ea73f4 | 267 | .remove = gpio_charger_remove, |
5070437c LPC |
268 | .driver = { |
269 | .name = "gpio-charger", | |
f10513de | 270 | .pm = &gpio_charger_pm_ops, |
c8dd9cce | 271 | .of_match_table = gpio_charger_match, |
5070437c LPC |
272 | }, |
273 | }; | |
274 | ||
300bac7f | 275 | module_platform_driver(gpio_charger_driver); |
5070437c LPC |
276 | |
277 | MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>"); | |
278 | MODULE_DESCRIPTION("Driver for chargers which report their online status through a GPIO"); | |
279 | MODULE_LICENSE("GPL"); | |
280 | MODULE_ALIAS("platform:gpio-charger"); |