cdc28923e0cec9ab45b52326b5dc272705500d15
[linux-2.6.git] / drivers / power / pda_power.c
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;
35
36 static int pda_power_get_property(struct power_supply *psy,
37                                   enum power_supply_property psp,
38                                   union power_supply_propval *val)
39 {
40         switch (psp) {
41         case POWER_SUPPLY_PROP_ONLINE:
42                 if (psy->type == POWER_SUPPLY_TYPE_MAINS)
43                         val->intval = pdata->is_ac_online ?
44                                       pdata->is_ac_online() : 0;
45                 else
46                         val->intval = pdata->is_usb_online ?
47                                       pdata->is_usb_online() : 0;
48                 break;
49         default:
50                 return -EINVAL;
51         }
52         return 0;
53 }
54
55 static enum power_supply_property pda_power_props[] = {
56         POWER_SUPPLY_PROP_ONLINE,
57 };
58
59 static char *pda_power_supplied_to[] = {
60         "main-battery",
61         "backup-battery",
62 };
63
64 static struct power_supply pda_power_supplies[] = {
65         {
66                 .name = "ac",
67                 .type = POWER_SUPPLY_TYPE_MAINS,
68                 .supplied_to = pda_power_supplied_to,
69                 .num_supplicants = ARRAY_SIZE(pda_power_supplied_to),
70                 .properties = pda_power_props,
71                 .num_properties = ARRAY_SIZE(pda_power_props),
72                 .get_property = pda_power_get_property,
73         },
74         {
75                 .name = "usb",
76                 .type = POWER_SUPPLY_TYPE_USB,
77                 .supplied_to = pda_power_supplied_to,
78                 .num_supplicants = ARRAY_SIZE(pda_power_supplied_to),
79                 .properties = pda_power_props,
80                 .num_properties = ARRAY_SIZE(pda_power_props),
81                 .get_property = pda_power_get_property,
82         },
83 };
84
85 static void update_charger(void)
86 {
87         if (!pdata->set_charge)
88                 return;
89
90         if (pdata->is_ac_online && pdata->is_ac_online()) {
91                 dev_dbg(dev, "charger on (AC)\n");
92                 pdata->set_charge(PDA_POWER_CHARGE_AC);
93         } else if (pdata->is_usb_online && pdata->is_usb_online()) {
94                 dev_dbg(dev, "charger on (USB)\n");
95                 pdata->set_charge(PDA_POWER_CHARGE_USB);
96         } else {
97                 dev_dbg(dev, "charger off\n");
98                 pdata->set_charge(0);
99         }
100
101         return;
102 }
103
104 static void supply_timer_func(unsigned long power_supply_ptr)
105 {
106         void *power_supply = (void *)power_supply_ptr;
107
108         power_supply_changed(power_supply);
109         return;
110 }
111
112 static void charger_timer_func(unsigned long power_supply_ptr)
113 {
114         update_charger();
115
116         /* Okay, charger set. Now wait a bit before notifying supplicants,
117          * charge power should stabilize. */
118         supply_timer.data = power_supply_ptr;
119         mod_timer(&supply_timer,
120                   jiffies + msecs_to_jiffies(pdata->wait_for_charger));
121         return;
122 }
123
124 static irqreturn_t power_changed_isr(int irq, void *power_supply)
125 {
126         /* Wait a bit before reading ac/usb line status and setting charger,
127          * because ac/usb status readings may lag from irq. */
128         charger_timer.data = (unsigned long)power_supply;
129         mod_timer(&charger_timer,
130                   jiffies + msecs_to_jiffies(pdata->wait_for_status));
131         return IRQ_HANDLED;
132 }
133
134 static int pda_power_probe(struct platform_device *pdev)
135 {
136         int ret = 0;
137
138         dev = &pdev->dev;
139
140         if (pdev->id != -1) {
141                 dev_err(dev, "it's meaningless to register several "
142                         "pda_powers; use id = -1\n");
143                 ret = -EINVAL;
144                 goto wrongid;
145         }
146
147         pdata = pdev->dev.platform_data;
148
149         update_charger();
150
151         if (!pdata->wait_for_status)
152                 pdata->wait_for_status = 500;
153
154         if (!pdata->wait_for_charger)
155                 pdata->wait_for_charger = 500;
156
157         setup_timer(&charger_timer, charger_timer_func, 0);
158         setup_timer(&supply_timer, supply_timer_func, 0);
159
160         ac_irq = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "ac");
161         usb_irq = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "usb");
162         if (!ac_irq && !usb_irq) {
163                 dev_err(dev, "no ac/usb irq specified\n");
164                 ret = -ENODEV;
165                 goto noirqs;
166         }
167
168         if (pdata->supplied_to) {
169                 pda_power_supplies[0].supplied_to = pdata->supplied_to;
170                 pda_power_supplies[1].supplied_to = pdata->supplied_to;
171                 pda_power_supplies[0].num_supplicants = pdata->num_supplicants;
172                 pda_power_supplies[1].num_supplicants = pdata->num_supplicants;
173         }
174
175         ret = power_supply_register(&pdev->dev, &pda_power_supplies[0]);
176         if (ret) {
177                 dev_err(dev, "failed to register %s power supply\n",
178                         pda_power_supplies[0].name);
179                 goto supply0_failed;
180         }
181
182         ret = power_supply_register(&pdev->dev, &pda_power_supplies[1]);
183         if (ret) {
184                 dev_err(dev, "failed to register %s power supply\n",
185                         pda_power_supplies[1].name);
186                 goto supply1_failed;
187         }
188
189         if (ac_irq) {
190                 ret = request_irq(ac_irq->start, power_changed_isr,
191                                   get_irq_flags(ac_irq), ac_irq->name,
192                                   &pda_power_supplies[0]);
193                 if (ret) {
194                         dev_err(dev, "request ac irq failed\n");
195                         goto ac_irq_failed;
196                 }
197         }
198
199         if (usb_irq) {
200                 ret = request_irq(usb_irq->start, power_changed_isr,
201                                   get_irq_flags(usb_irq), usb_irq->name,
202                                   &pda_power_supplies[1]);
203                 if (ret) {
204                         dev_err(dev, "request usb irq failed\n");
205                         goto usb_irq_failed;
206                 }
207         }
208
209         goto success;
210
211 usb_irq_failed:
212         if (ac_irq)
213                 free_irq(ac_irq->start, &pda_power_supplies[0]);
214 ac_irq_failed:
215         power_supply_unregister(&pda_power_supplies[1]);
216 supply1_failed:
217         power_supply_unregister(&pda_power_supplies[0]);
218 supply0_failed:
219 noirqs:
220 wrongid:
221 success:
222         return ret;
223 }
224
225 static int pda_power_remove(struct platform_device *pdev)
226 {
227         if (usb_irq)
228                 free_irq(usb_irq->start, &pda_power_supplies[1]);
229         if (ac_irq)
230                 free_irq(ac_irq->start, &pda_power_supplies[0]);
231         del_timer_sync(&charger_timer);
232         del_timer_sync(&supply_timer);
233         power_supply_unregister(&pda_power_supplies[1]);
234         power_supply_unregister(&pda_power_supplies[0]);
235         return 0;
236 }
237
238 static struct platform_driver pda_power_pdrv = {
239         .driver = {
240                 .name = "pda-power",
241         },
242         .probe = pda_power_probe,
243         .remove = pda_power_remove,
244 };
245
246 static int __init pda_power_init(void)
247 {
248         return platform_driver_register(&pda_power_pdrv);
249 }
250
251 static void __exit pda_power_exit(void)
252 {
253         platform_driver_unregister(&pda_power_pdrv);
254         return;
255 }
256
257 module_init(pda_power_init);
258 module_exit(pda_power_exit);
259 MODULE_LICENSE("GPL");
260 MODULE_AUTHOR("Anton Vorontsov <cbou@mail.ru>");