Commit | Line | Data |
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b2998049 AV |
1 | /* |
2 | * Common power driver for PDAs and phones with one or two external | |
3 | * power supplies (AC/USB) connected to main and backup batteries, | |
4 | * and optional builtin charger. | |
5 | * | |
6 | * Copyright © 2007 Anton Vorontsov <cbou@mail.ru> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | ||
13 | #include <linux/module.h> | |
14 | #include <linux/platform_device.h> | |
15 | #include <linux/interrupt.h> | |
16 | #include <linux/power_supply.h> | |
17 | #include <linux/pda_power.h> | |
18 | #include <linux/timer.h> | |
19 | #include <linux/jiffies.h> | |
20 | ||
21 | static inline unsigned int get_irq_flags(struct resource *res) | |
22 | { | |
23 | unsigned int flags = IRQF_DISABLED | IRQF_SHARED; | |
24 | ||
25 | flags |= res->flags & IRQF_TRIGGER_MASK; | |
26 | ||
27 | return flags; | |
28 | } | |
29 | ||
30 | static struct device *dev; | |
31 | static struct pda_power_pdata *pdata; | |
32 | static struct resource *ac_irq, *usb_irq; | |
33 | static struct timer_list charger_timer; | |
34 | static struct timer_list supply_timer; | |
c3caebad AV |
35 | static struct timer_list polling_timer; |
36 | static int polling; | |
b2998049 | 37 | |
bfde2662 AV |
38 | enum { |
39 | PDA_PSY_OFFLINE = 0, | |
40 | PDA_PSY_ONLINE = 1, | |
41 | PDA_PSY_TO_CHANGE, | |
42 | }; | |
43 | static int new_ac_status = -1; | |
44 | static int new_usb_status = -1; | |
45 | static int ac_status = -1; | |
46 | static int usb_status = -1; | |
47 | ||
b2998049 AV |
48 | static int pda_power_get_property(struct power_supply *psy, |
49 | enum power_supply_property psp, | |
50 | union power_supply_propval *val) | |
51 | { | |
52 | switch (psp) { | |
53 | case POWER_SUPPLY_PROP_ONLINE: | |
54 | if (psy->type == POWER_SUPPLY_TYPE_MAINS) | |
55 | val->intval = pdata->is_ac_online ? | |
56 | pdata->is_ac_online() : 0; | |
57 | else | |
58 | val->intval = pdata->is_usb_online ? | |
59 | pdata->is_usb_online() : 0; | |
60 | break; | |
61 | default: | |
62 | return -EINVAL; | |
63 | } | |
64 | return 0; | |
65 | } | |
66 | ||
67 | static enum power_supply_property pda_power_props[] = { | |
68 | POWER_SUPPLY_PROP_ONLINE, | |
69 | }; | |
70 | ||
71 | static char *pda_power_supplied_to[] = { | |
72 | "main-battery", | |
73 | "backup-battery", | |
74 | }; | |
75 | ||
bfde2662 AV |
76 | static struct power_supply pda_psy_ac = { |
77 | .name = "ac", | |
78 | .type = POWER_SUPPLY_TYPE_MAINS, | |
79 | .supplied_to = pda_power_supplied_to, | |
80 | .num_supplicants = ARRAY_SIZE(pda_power_supplied_to), | |
81 | .properties = pda_power_props, | |
82 | .num_properties = ARRAY_SIZE(pda_power_props), | |
83 | .get_property = pda_power_get_property, | |
b2998049 AV |
84 | }; |
85 | ||
bfde2662 AV |
86 | static struct power_supply pda_psy_usb = { |
87 | .name = "usb", | |
88 | .type = POWER_SUPPLY_TYPE_USB, | |
89 | .supplied_to = pda_power_supplied_to, | |
90 | .num_supplicants = ARRAY_SIZE(pda_power_supplied_to), | |
91 | .properties = pda_power_props, | |
92 | .num_properties = ARRAY_SIZE(pda_power_props), | |
93 | .get_property = pda_power_get_property, | |
94 | }; | |
95 | ||
96 | static void update_status(void) | |
97 | { | |
98 | if (pdata->is_ac_online) | |
99 | new_ac_status = !!pdata->is_ac_online(); | |
100 | ||
101 | if (pdata->is_usb_online) | |
102 | new_usb_status = !!pdata->is_usb_online(); | |
103 | } | |
104 | ||
b2998049 AV |
105 | static void update_charger(void) |
106 | { | |
107 | if (!pdata->set_charge) | |
108 | return; | |
109 | ||
bfde2662 | 110 | if (new_ac_status > 0) { |
b2998049 AV |
111 | dev_dbg(dev, "charger on (AC)\n"); |
112 | pdata->set_charge(PDA_POWER_CHARGE_AC); | |
bfde2662 | 113 | } else if (new_usb_status > 0) { |
b2998049 AV |
114 | dev_dbg(dev, "charger on (USB)\n"); |
115 | pdata->set_charge(PDA_POWER_CHARGE_USB); | |
116 | } else { | |
117 | dev_dbg(dev, "charger off\n"); | |
118 | pdata->set_charge(0); | |
119 | } | |
b2998049 AV |
120 | } |
121 | ||
bfde2662 | 122 | static void supply_timer_func(unsigned long unused) |
b2998049 | 123 | { |
bfde2662 AV |
124 | if (ac_status == PDA_PSY_TO_CHANGE) { |
125 | ac_status = new_ac_status; | |
126 | power_supply_changed(&pda_psy_ac); | |
127 | } | |
5ebf6e6a | 128 | |
bfde2662 AV |
129 | if (usb_status == PDA_PSY_TO_CHANGE) { |
130 | usb_status = new_usb_status; | |
131 | power_supply_changed(&pda_psy_usb); | |
132 | } | |
b2998049 AV |
133 | } |
134 | ||
bfde2662 | 135 | static void psy_changed(void) |
b2998049 AV |
136 | { |
137 | update_charger(); | |
138 | ||
bfde2662 AV |
139 | /* |
140 | * Okay, charger set. Now wait a bit before notifying supplicants, | |
141 | * charge power should stabilize. | |
142 | */ | |
b2998049 AV |
143 | mod_timer(&supply_timer, |
144 | jiffies + msecs_to_jiffies(pdata->wait_for_charger)); | |
b2998049 AV |
145 | } |
146 | ||
bfde2662 AV |
147 | static void charger_timer_func(unsigned long unused) |
148 | { | |
149 | update_status(); | |
150 | psy_changed(); | |
151 | } | |
152 | ||
5ebf6e6a | 153 | static irqreturn_t power_changed_isr(int irq, void *power_supply) |
b2998049 | 154 | { |
bfde2662 AV |
155 | if (power_supply == &pda_psy_ac) |
156 | ac_status = PDA_PSY_TO_CHANGE; | |
157 | else if (power_supply == &pda_psy_usb) | |
158 | usb_status = PDA_PSY_TO_CHANGE; | |
159 | else | |
160 | return IRQ_NONE; | |
161 | ||
162 | /* | |
163 | * Wait a bit before reading ac/usb line status and setting charger, | |
164 | * because ac/usb status readings may lag from irq. | |
165 | */ | |
b2998049 AV |
166 | mod_timer(&charger_timer, |
167 | jiffies + msecs_to_jiffies(pdata->wait_for_status)); | |
bfde2662 | 168 | |
b2998049 AV |
169 | return IRQ_HANDLED; |
170 | } | |
171 | ||
c3caebad AV |
172 | static void polling_timer_func(unsigned long unused) |
173 | { | |
174 | int changed = 0; | |
175 | ||
176 | dev_dbg(dev, "polling...\n"); | |
177 | ||
178 | update_status(); | |
179 | ||
180 | if (!ac_irq && new_ac_status != ac_status) { | |
181 | ac_status = PDA_PSY_TO_CHANGE; | |
182 | changed = 1; | |
183 | } | |
184 | ||
185 | if (!usb_irq && new_usb_status != usb_status) { | |
186 | usb_status = PDA_PSY_TO_CHANGE; | |
187 | changed = 1; | |
188 | } | |
189 | ||
190 | if (changed) | |
191 | psy_changed(); | |
192 | ||
193 | mod_timer(&polling_timer, | |
194 | jiffies + msecs_to_jiffies(pdata->polling_interval)); | |
195 | } | |
196 | ||
b2998049 AV |
197 | static int pda_power_probe(struct platform_device *pdev) |
198 | { | |
199 | int ret = 0; | |
200 | ||
201 | dev = &pdev->dev; | |
202 | ||
203 | if (pdev->id != -1) { | |
204 | dev_err(dev, "it's meaningless to register several " | |
205 | "pda_powers; use id = -1\n"); | |
206 | ret = -EINVAL; | |
207 | goto wrongid; | |
208 | } | |
209 | ||
210 | pdata = pdev->dev.platform_data; | |
211 | ||
bfde2662 | 212 | update_status(); |
b2998049 AV |
213 | update_charger(); |
214 | ||
215 | if (!pdata->wait_for_status) | |
216 | pdata->wait_for_status = 500; | |
217 | ||
218 | if (!pdata->wait_for_charger) | |
219 | pdata->wait_for_charger = 500; | |
220 | ||
c3caebad AV |
221 | if (!pdata->polling_interval) |
222 | pdata->polling_interval = 2000; | |
223 | ||
b2998049 AV |
224 | setup_timer(&charger_timer, charger_timer_func, 0); |
225 | setup_timer(&supply_timer, supply_timer_func, 0); | |
226 | ||
227 | ac_irq = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "ac"); | |
228 | usb_irq = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "usb"); | |
b2998049 AV |
229 | |
230 | if (pdata->supplied_to) { | |
bfde2662 AV |
231 | pda_psy_ac.supplied_to = pdata->supplied_to; |
232 | pda_psy_ac.num_supplicants = pdata->num_supplicants; | |
233 | pda_psy_usb.supplied_to = pdata->supplied_to; | |
234 | pda_psy_usb.num_supplicants = pdata->num_supplicants; | |
b2998049 AV |
235 | } |
236 | ||
9ef45106 | 237 | if (pdata->is_ac_online) { |
bfde2662 | 238 | ret = power_supply_register(&pdev->dev, &pda_psy_ac); |
9ef45106 DB |
239 | if (ret) { |
240 | dev_err(dev, "failed to register %s power supply\n", | |
bfde2662 | 241 | pda_psy_ac.name); |
9ef45106 DB |
242 | goto ac_supply_failed; |
243 | } | |
b2998049 | 244 | |
9ef45106 DB |
245 | if (ac_irq) { |
246 | ret = request_irq(ac_irq->start, power_changed_isr, | |
247 | get_irq_flags(ac_irq), ac_irq->name, | |
bfde2662 | 248 | &pda_psy_ac); |
9ef45106 DB |
249 | if (ret) { |
250 | dev_err(dev, "request ac irq failed\n"); | |
251 | goto ac_irq_failed; | |
252 | } | |
c3caebad AV |
253 | } else { |
254 | polling = 1; | |
9ef45106 | 255 | } |
b2998049 AV |
256 | } |
257 | ||
9ef45106 | 258 | if (pdata->is_usb_online) { |
bfde2662 | 259 | ret = power_supply_register(&pdev->dev, &pda_psy_usb); |
b2998049 | 260 | if (ret) { |
9ef45106 | 261 | dev_err(dev, "failed to register %s power supply\n", |
bfde2662 | 262 | pda_psy_usb.name); |
9ef45106 | 263 | goto usb_supply_failed; |
b2998049 | 264 | } |
b2998049 | 265 | |
9ef45106 DB |
266 | if (usb_irq) { |
267 | ret = request_irq(usb_irq->start, power_changed_isr, | |
268 | get_irq_flags(usb_irq), | |
bfde2662 | 269 | usb_irq->name, &pda_psy_usb); |
9ef45106 DB |
270 | if (ret) { |
271 | dev_err(dev, "request usb irq failed\n"); | |
272 | goto usb_irq_failed; | |
273 | } | |
c3caebad AV |
274 | } else { |
275 | polling = 1; | |
b2998049 AV |
276 | } |
277 | } | |
278 | ||
c3caebad AV |
279 | if (polling) { |
280 | dev_dbg(dev, "will poll for status\n"); | |
281 | setup_timer(&polling_timer, polling_timer_func, 0); | |
282 | mod_timer(&polling_timer, | |
283 | jiffies + msecs_to_jiffies(pdata->polling_interval)); | |
284 | } | |
285 | ||
286 | if (ac_irq || usb_irq) | |
287 | device_init_wakeup(&pdev->dev, 1); | |
8f8e9b38 | 288 | |
9ef45106 | 289 | return 0; |
b2998049 AV |
290 | |
291 | usb_irq_failed: | |
9ef45106 | 292 | if (pdata->is_usb_online) |
bfde2662 | 293 | power_supply_unregister(&pda_psy_usb); |
9ef45106 DB |
294 | usb_supply_failed: |
295 | if (pdata->is_ac_online && ac_irq) | |
bfde2662 | 296 | free_irq(ac_irq->start, &pda_psy_ac); |
b2998049 | 297 | ac_irq_failed: |
9ef45106 | 298 | if (pdata->is_ac_online) |
bfde2662 | 299 | power_supply_unregister(&pda_psy_ac); |
9ef45106 | 300 | ac_supply_failed: |
b2998049 | 301 | wrongid: |
b2998049 AV |
302 | return ret; |
303 | } | |
304 | ||
305 | static int pda_power_remove(struct platform_device *pdev) | |
306 | { | |
9ef45106 | 307 | if (pdata->is_usb_online && usb_irq) |
bfde2662 | 308 | free_irq(usb_irq->start, &pda_psy_usb); |
9ef45106 | 309 | if (pdata->is_ac_online && ac_irq) |
bfde2662 AV |
310 | free_irq(ac_irq->start, &pda_psy_ac); |
311 | ||
c3caebad AV |
312 | if (polling) |
313 | del_timer_sync(&polling_timer); | |
b2998049 AV |
314 | del_timer_sync(&charger_timer); |
315 | del_timer_sync(&supply_timer); | |
bfde2662 | 316 | |
9ef45106 | 317 | if (pdata->is_usb_online) |
bfde2662 | 318 | power_supply_unregister(&pda_psy_usb); |
9ef45106 | 319 | if (pdata->is_ac_online) |
bfde2662 AV |
320 | power_supply_unregister(&pda_psy_ac); |
321 | ||
b2998049 AV |
322 | return 0; |
323 | } | |
324 | ||
8f8e9b38 DB |
325 | #ifdef CONFIG_PM |
326 | static int pda_power_suspend(struct platform_device *pdev, pm_message_t state) | |
327 | { | |
328 | if (device_may_wakeup(&pdev->dev)) { | |
329 | if (ac_irq) | |
330 | enable_irq_wake(ac_irq->start); | |
331 | if (usb_irq) | |
332 | enable_irq_wake(usb_irq->start); | |
333 | } | |
334 | ||
335 | return 0; | |
336 | } | |
337 | ||
338 | static int pda_power_resume(struct platform_device *pdev) | |
339 | { | |
340 | if (device_may_wakeup(&pdev->dev)) { | |
341 | if (usb_irq) | |
342 | disable_irq_wake(usb_irq->start); | |
343 | if (ac_irq) | |
344 | disable_irq_wake(ac_irq->start); | |
345 | } | |
346 | ||
347 | return 0; | |
348 | } | |
349 | #else | |
350 | #define pda_power_suspend NULL | |
351 | #define pda_power_resume NULL | |
352 | #endif /* CONFIG_PM */ | |
353 | ||
b2998049 AV |
354 | static struct platform_driver pda_power_pdrv = { |
355 | .driver = { | |
356 | .name = "pda-power", | |
357 | }, | |
358 | .probe = pda_power_probe, | |
359 | .remove = pda_power_remove, | |
8f8e9b38 DB |
360 | .suspend = pda_power_suspend, |
361 | .resume = pda_power_resume, | |
b2998049 AV |
362 | }; |
363 | ||
364 | static int __init pda_power_init(void) | |
365 | { | |
366 | return platform_driver_register(&pda_power_pdrv); | |
367 | } | |
368 | ||
369 | static void __exit pda_power_exit(void) | |
370 | { | |
371 | platform_driver_unregister(&pda_power_pdrv); | |
b2998049 AV |
372 | } |
373 | ||
374 | module_init(pda_power_init); | |
375 | module_exit(pda_power_exit); | |
376 | MODULE_LICENSE("GPL"); | |
377 | MODULE_AUTHOR("Anton Vorontsov <cbou@mail.ru>"); |