[ARM] pxa/z2: fix missing include in battery driver
[linux-2.6.git] / drivers / power / z2_battery.c
1 /*
2  * Battery measurement code for Zipit Z2
3  *
4  * Copyright (C) 2009 Peter Edwards <sweetlilmre@gmail.com>
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 as
8  * published by the Free Software Foundation.
9  *
10  */
11
12 #include <linux/module.h>
13 #include <linux/gpio.h>
14 #include <linux/i2c.h>
15 #include <linux/interrupt.h>
16 #include <linux/irq.h>
17 #include <linux/power_supply.h>
18 #include <linux/slab.h>
19 #include <linux/z2_battery.h>
20
21 #define Z2_DEFAULT_NAME "Z2"
22
23 struct z2_charger {
24         struct z2_battery_info  *info;
25         int                     bat_status;
26         struct i2c_client       *client;
27         struct power_supply     batt_ps;
28         struct mutex            work_lock;
29         struct work_struct      bat_work;
30 };
31
32 static unsigned long z2_read_bat(struct z2_charger *charger)
33 {
34         int data;
35         data = i2c_smbus_read_byte_data(charger->client,
36                                         charger->info->batt_I2C_reg);
37         if (data < 0)
38                 return 0;
39
40         return data * charger->info->batt_mult / charger->info->batt_div;
41 }
42
43 static int z2_batt_get_property(struct power_supply *batt_ps,
44                             enum power_supply_property psp,
45                             union power_supply_propval *val)
46 {
47         struct z2_charger *charger = container_of(batt_ps, struct z2_charger,
48                                                 batt_ps);
49         struct z2_battery_info *info = charger->info;
50
51         switch (psp) {
52         case POWER_SUPPLY_PROP_STATUS:
53                 val->intval = charger->bat_status;
54                 break;
55         case POWER_SUPPLY_PROP_TECHNOLOGY:
56                 val->intval = info->batt_tech;
57                 break;
58         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
59                 if (info->batt_I2C_reg >= 0)
60                         val->intval = z2_read_bat(charger);
61                 else
62                         return -EINVAL;
63                 break;
64         case POWER_SUPPLY_PROP_VOLTAGE_MAX:
65                 if (info->max_voltage >= 0)
66                         val->intval = info->max_voltage;
67                 else
68                         return -EINVAL;
69                 break;
70         case POWER_SUPPLY_PROP_VOLTAGE_MIN:
71                 if (info->min_voltage >= 0)
72                         val->intval = info->min_voltage;
73                 else
74                         return -EINVAL;
75                 break;
76         case POWER_SUPPLY_PROP_PRESENT:
77                 val->intval = 1;
78                 break;
79         default:
80                 return -EINVAL;
81         }
82
83         return 0;
84 }
85
86 static void z2_batt_ext_power_changed(struct power_supply *batt_ps)
87 {
88         struct z2_charger *charger = container_of(batt_ps, struct z2_charger,
89                                                 batt_ps);
90         schedule_work(&charger->bat_work);
91 }
92
93 static void z2_batt_update(struct z2_charger *charger)
94 {
95         int old_status = charger->bat_status;
96         struct z2_battery_info *info;
97
98         info = charger->info;
99
100         mutex_lock(&charger->work_lock);
101
102         charger->bat_status = (info->charge_gpio >= 0) ?
103                 (gpio_get_value(info->charge_gpio) ?
104                 POWER_SUPPLY_STATUS_CHARGING :
105                 POWER_SUPPLY_STATUS_DISCHARGING) :
106                 POWER_SUPPLY_STATUS_UNKNOWN;
107
108         if (old_status != charger->bat_status) {
109                 pr_debug("%s: %i -> %i\n", charger->batt_ps.name, old_status,
110                         charger->bat_status);
111                 power_supply_changed(&charger->batt_ps);
112         }
113
114         mutex_unlock(&charger->work_lock);
115 }
116
117 static void z2_batt_work(struct work_struct *work)
118 {
119         struct z2_charger *charger;
120         charger = container_of(work, struct z2_charger, bat_work);
121         z2_batt_update(charger);
122 }
123
124 static irqreturn_t z2_charge_switch_irq(int irq, void *devid)
125 {
126         struct z2_charger *charger = devid;
127         schedule_work(&charger->bat_work);
128         return IRQ_HANDLED;
129 }
130
131 static int z2_batt_ps_init(struct z2_charger *charger, int props)
132 {
133         int i = 0;
134         enum power_supply_property *prop;
135         struct z2_battery_info *info = charger->info;
136
137         if (info->batt_tech >= 0)
138                 props++;        /* POWER_SUPPLY_PROP_TECHNOLOGY */
139         if (info->batt_I2C_reg >= 0)
140                 props++;        /* POWER_SUPPLY_PROP_VOLTAGE_NOW */
141         if (info->max_voltage >= 0)
142                 props++;        /* POWER_SUPPLY_PROP_VOLTAGE_MAX */
143         if (info->min_voltage >= 0)
144                 props++;        /* POWER_SUPPLY_PROP_VOLTAGE_MIN */
145
146         prop = kzalloc(props * sizeof(*prop), GFP_KERNEL);
147         if (!prop)
148                 return -ENOMEM;
149
150         prop[i++] = POWER_SUPPLY_PROP_PRESENT;
151         if (info->charge_gpio >= 0)
152                 prop[i++] = POWER_SUPPLY_PROP_STATUS;
153         if (info->batt_tech >= 0)
154                 prop[i++] = POWER_SUPPLY_PROP_TECHNOLOGY;
155         if (info->batt_I2C_reg >= 0)
156                 prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_NOW;
157         if (info->max_voltage >= 0)
158                 prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MAX;
159         if (info->min_voltage >= 0)
160                 prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MIN;
161
162         if (!info->batt_name) {
163                 dev_info(&charger->client->dev,
164                                 "Please consider setting proper battery "
165                                 "name in platform definition file, falling "
166                                 "back to name \" Z2_DEFAULT_NAME \"\n");
167                 charger->batt_ps.name = Z2_DEFAULT_NAME;
168         } else
169                 charger->batt_ps.name = info->batt_name;
170
171         charger->batt_ps.properties             = prop;
172         charger->batt_ps.num_properties         = props;
173         charger->batt_ps.type                   = POWER_SUPPLY_TYPE_BATTERY;
174         charger->batt_ps.get_property           = z2_batt_get_property;
175         charger->batt_ps.external_power_changed = z2_batt_ext_power_changed;
176         charger->batt_ps.use_for_apm            = 1;
177
178         return 0;
179 }
180
181 static int __devinit z2_batt_probe(struct i2c_client *client,
182                                 const struct i2c_device_id *id)
183 {
184         int ret = 0;
185         int props = 1;  /* POWER_SUPPLY_PROP_PRESENT */
186         struct z2_charger *charger;
187         struct z2_battery_info *info = client->dev.platform_data;
188
189         if (info == NULL) {
190                 dev_err(&client->dev,
191                         "Please set platform device platform_data"
192                         " to a valid z2_battery_info pointer!\n");
193                 return -EINVAL;
194         }
195
196         charger = kzalloc(sizeof(*charger), GFP_KERNEL);
197         if (charger == NULL)
198                 return -ENOMEM;
199
200         charger->bat_status = POWER_SUPPLY_STATUS_UNKNOWN;
201         charger->info = info;
202         charger->client = client;
203         i2c_set_clientdata(client, charger);
204
205         mutex_init(&charger->work_lock);
206
207         if (info->charge_gpio >= 0 && gpio_is_valid(info->charge_gpio)) {
208                 ret = gpio_request(info->charge_gpio, "BATT CHRG");
209                 if (ret)
210                         goto err;
211
212                 ret = gpio_direction_input(info->charge_gpio);
213                 if (ret)
214                         goto err2;
215
216                 set_irq_type(gpio_to_irq(info->charge_gpio),
217                                 IRQ_TYPE_EDGE_BOTH);
218                 ret = request_irq(gpio_to_irq(info->charge_gpio),
219                                 z2_charge_switch_irq, IRQF_DISABLED,
220                                 "AC Detect", charger);
221                 if (ret)
222                         goto err3;
223         }
224
225         ret = z2_batt_ps_init(charger, props);
226         if (ret)
227                 goto err3;
228
229         INIT_WORK(&charger->bat_work, z2_batt_work);
230
231         ret = power_supply_register(&client->dev, &charger->batt_ps);
232         if (ret)
233                 goto err4;
234
235         schedule_work(&charger->bat_work);
236
237         return 0;
238
239 err4:
240         kfree(charger->batt_ps.properties);
241 err3:
242         if (info->charge_gpio >= 0 && gpio_is_valid(info->charge_gpio))
243                 free_irq(gpio_to_irq(info->charge_gpio), charger);
244 err2:
245         if (info->charge_gpio >= 0 && gpio_is_valid(info->charge_gpio))
246                 gpio_free(info->charge_gpio);
247 err:
248         kfree(charger);
249         return ret;
250 }
251
252 static int __devexit z2_batt_remove(struct i2c_client *client)
253 {
254         struct z2_charger *charger = i2c_get_clientdata(client);
255         struct z2_battery_info *info = charger->info;
256
257         flush_scheduled_work();
258         power_supply_unregister(&charger->batt_ps);
259
260         kfree(charger->batt_ps.properties);
261         if (info->charge_gpio >= 0 && gpio_is_valid(info->charge_gpio)) {
262                 free_irq(gpio_to_irq(info->charge_gpio), charger);
263                 gpio_free(info->charge_gpio);
264         }
265
266         kfree(charger);
267
268         return 0;
269 }
270
271 #ifdef CONFIG_PM
272 static int z2_batt_suspend(struct i2c_client *client, pm_message_t state)
273 {
274         flush_scheduled_work();
275         return 0;
276 }
277
278 static int z2_batt_resume(struct i2c_client *client)
279 {
280         struct z2_charger *charger = i2c_get_clientdata(client);
281
282         schedule_work(&charger->bat_work);
283         return 0;
284 }
285 #else
286 #define z2_batt_suspend NULL
287 #define z2_batt_resume NULL
288 #endif
289
290 static const struct i2c_device_id z2_batt_id[] = {
291         { "aer915", 0 },
292         { }
293 };
294
295 static struct i2c_driver z2_batt_driver = {
296         .driver = {
297                 .name   = "z2-battery",
298                 .owner  = THIS_MODULE,
299         },
300         .probe          = z2_batt_probe,
301         .remove         = z2_batt_remove,
302         .suspend        = z2_batt_suspend,
303         .resume         = z2_batt_resume,
304         .id_table       = z2_batt_id,
305 };
306
307 static int __init z2_batt_init(void)
308 {
309         return i2c_add_driver(&z2_batt_driver);
310 }
311
312 static void __exit z2_batt_exit(void)
313 {
314         i2c_del_driver(&z2_batt_driver);
315 }
316
317 module_init(z2_batt_init);
318 module_exit(z2_batt_exit);
319
320 MODULE_LICENSE("GPL");
321 MODULE_AUTHOR("Peter Edwards <sweetlilmre@gmail.com>");
322 MODULE_DESCRIPTION("Zipit Z2 battery driver");