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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; | |
2dc9215d | 130 | struct power_supply_config psy_cfg = {}; |
5070437c LPC |
131 | struct gpio_charger *gpio_charger; |
132 | struct power_supply *charger; | |
133 | int ret; | |
134 | int irq; | |
135 | ||
136 | if (!pdata) { | |
c8dd9cce HS |
137 | pdata = gpio_charger_parse_dt(&pdev->dev); |
138 | if (IS_ERR(pdata)) { | |
139 | ret = PTR_ERR(pdata); | |
140 | if (ret != -EPROBE_DEFER) | |
141 | dev_err(&pdev->dev, "No platform data\n"); | |
142 | return ret; | |
143 | } | |
5070437c LPC |
144 | } |
145 | ||
146 | if (!gpio_is_valid(pdata->gpio)) { | |
147 | dev_err(&pdev->dev, "Invalid gpio pin\n"); | |
148 | return -EINVAL; | |
149 | } | |
150 | ||
b92ff855 JH |
151 | gpio_charger = devm_kzalloc(&pdev->dev, sizeof(*gpio_charger), |
152 | GFP_KERNEL); | |
2e9ff5f5 LPC |
153 | if (!gpio_charger) { |
154 | dev_err(&pdev->dev, "Failed to alloc driver structure\n"); | |
155 | return -ENOMEM; | |
156 | } | |
5070437c LPC |
157 | |
158 | charger = &gpio_charger->charger; | |
159 | ||
80577b8a | 160 | charger->name = pdata->name ? pdata->name : "gpio-charger"; |
5070437c LPC |
161 | charger->type = pdata->type; |
162 | charger->properties = gpio_charger_properties; | |
163 | charger->num_properties = ARRAY_SIZE(gpio_charger_properties); | |
26eb3872 | 164 | charger->get_property = gpio_charger_get_property; |
2dc9215d KK |
165 | |
166 | psy_cfg.supplied_to = pdata->supplied_to; | |
167 | psy_cfg.num_supplicants = pdata->num_supplicants; | |
168 | psy_cfg.of_node = pdev->dev.of_node; | |
5070437c LPC |
169 | |
170 | ret = gpio_request(pdata->gpio, dev_name(&pdev->dev)); | |
171 | if (ret) { | |
172 | dev_err(&pdev->dev, "Failed to request gpio pin: %d\n", ret); | |
173 | goto err_free; | |
174 | } | |
175 | ret = gpio_direction_input(pdata->gpio); | |
176 | if (ret) { | |
177 | dev_err(&pdev->dev, "Failed to set gpio to input: %d\n", ret); | |
178 | goto err_gpio_free; | |
179 | } | |
180 | ||
26eb3872 LPC |
181 | gpio_charger->pdata = pdata; |
182 | ||
2dc9215d | 183 | ret = power_supply_register(&pdev->dev, charger, &psy_cfg); |
26eb3872 LPC |
184 | if (ret < 0) { |
185 | dev_err(&pdev->dev, "Failed to register power supply: %d\n", | |
186 | ret); | |
187 | goto err_gpio_free; | |
188 | } | |
189 | ||
5070437c LPC |
190 | irq = gpio_to_irq(pdata->gpio); |
191 | if (irq > 0) { | |
26eb3872 | 192 | ret = request_any_context_irq(irq, gpio_charger_irq, |
5070437c LPC |
193 | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, |
194 | dev_name(&pdev->dev), charger); | |
f8c63918 | 195 | if (ret < 0) |
5070437c LPC |
196 | dev_warn(&pdev->dev, "Failed to request irq: %d\n", ret); |
197 | else | |
198 | gpio_charger->irq = irq; | |
199 | } | |
200 | ||
5070437c LPC |
201 | platform_set_drvdata(pdev, gpio_charger); |
202 | ||
4ea81266 DES |
203 | device_init_wakeup(&pdev->dev, 1); |
204 | ||
5070437c LPC |
205 | return 0; |
206 | ||
5070437c LPC |
207 | err_gpio_free: |
208 | gpio_free(pdata->gpio); | |
209 | err_free: | |
5070437c LPC |
210 | return ret; |
211 | } | |
212 | ||
415ec69f | 213 | static int gpio_charger_remove(struct platform_device *pdev) |
5070437c LPC |
214 | { |
215 | struct gpio_charger *gpio_charger = platform_get_drvdata(pdev); | |
216 | ||
5070437c LPC |
217 | if (gpio_charger->irq) |
218 | free_irq(gpio_charger->irq, &gpio_charger->charger); | |
26eb3872 LPC |
219 | |
220 | power_supply_unregister(&gpio_charger->charger); | |
221 | ||
5070437c LPC |
222 | gpio_free(gpio_charger->pdata->gpio); |
223 | ||
5070437c LPC |
224 | return 0; |
225 | } | |
226 | ||
f10513de | 227 | #ifdef CONFIG_PM_SLEEP |
4ea81266 DES |
228 | static int gpio_charger_suspend(struct device *dev) |
229 | { | |
230 | struct gpio_charger *gpio_charger = dev_get_drvdata(dev); | |
231 | ||
232 | if (device_may_wakeup(dev)) | |
233 | gpio_charger->wakeup_enabled = | |
faeed51b | 234 | !enable_irq_wake(gpio_charger->irq); |
4ea81266 DES |
235 | |
236 | return 0; | |
237 | } | |
238 | ||
f10513de BL |
239 | static int gpio_charger_resume(struct device *dev) |
240 | { | |
241 | struct platform_device *pdev = to_platform_device(dev); | |
242 | struct gpio_charger *gpio_charger = platform_get_drvdata(pdev); | |
243 | ||
faeed51b | 244 | if (device_may_wakeup(dev) && gpio_charger->wakeup_enabled) |
4ea81266 | 245 | disable_irq_wake(gpio_charger->irq); |
f10513de BL |
246 | power_supply_changed(&gpio_charger->charger); |
247 | ||
248 | return 0; | |
249 | } | |
250 | #endif | |
251 | ||
4ea81266 DES |
252 | static SIMPLE_DEV_PM_OPS(gpio_charger_pm_ops, |
253 | gpio_charger_suspend, gpio_charger_resume); | |
f10513de | 254 | |
c8dd9cce HS |
255 | static const struct of_device_id gpio_charger_match[] = { |
256 | { .compatible = "gpio-charger" }, | |
257 | { } | |
258 | }; | |
259 | MODULE_DEVICE_TABLE(of, gpio_charger_match); | |
260 | ||
5070437c LPC |
261 | static struct platform_driver gpio_charger_driver = { |
262 | .probe = gpio_charger_probe, | |
28ea73f4 | 263 | .remove = gpio_charger_remove, |
5070437c LPC |
264 | .driver = { |
265 | .name = "gpio-charger", | |
f10513de | 266 | .pm = &gpio_charger_pm_ops, |
c8dd9cce | 267 | .of_match_table = gpio_charger_match, |
5070437c LPC |
268 | }, |
269 | }; | |
270 | ||
300bac7f | 271 | module_platform_driver(gpio_charger_driver); |
5070437c LPC |
272 | |
273 | MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>"); | |
274 | MODULE_DESCRIPTION("Driver for chargers which report their online status through a GPIO"); | |
275 | MODULE_LICENSE("GPL"); | |
276 | MODULE_ALIAS("platform:gpio-charger"); |