PageRenderTime 35ms CodeModel.GetById 23ms app.highlight 10ms RepoModel.GetById 0ms app.codeStats 0ms

/drivers/power/z2_battery.c

https://bitbucket.org/cyanogenmod/android_kernel_asus_tf300t
C | 335 lines | 269 code | 56 blank | 10 comment | 36 complexity | d8b1c7ba178aa08c9d777f26de538fa2 MD5 | raw file
Possible License(s): LGPL-2.0, AGPL-1.0, GPL-2.0
  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
 23struct 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
 32static 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
 43static 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
 86static 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
 93static 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
117static 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
124static 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
131static 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->charge_gpio >= 0)
138		props++;	/* POWER_SUPPLY_PROP_STATUS */
139	if (info->batt_tech >= 0)
140		props++;	/* POWER_SUPPLY_PROP_TECHNOLOGY */
141	if (info->batt_I2C_reg >= 0)
142		props++;	/* POWER_SUPPLY_PROP_VOLTAGE_NOW */
143	if (info->max_voltage >= 0)
144		props++;	/* POWER_SUPPLY_PROP_VOLTAGE_MAX */
145	if (info->min_voltage >= 0)
146		props++;	/* POWER_SUPPLY_PROP_VOLTAGE_MIN */
147
148	prop = kzalloc(props * sizeof(*prop), GFP_KERNEL);
149	if (!prop)
150		return -ENOMEM;
151
152	prop[i++] = POWER_SUPPLY_PROP_PRESENT;
153	if (info->charge_gpio >= 0)
154		prop[i++] = POWER_SUPPLY_PROP_STATUS;
155	if (info->batt_tech >= 0)
156		prop[i++] = POWER_SUPPLY_PROP_TECHNOLOGY;
157	if (info->batt_I2C_reg >= 0)
158		prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_NOW;
159	if (info->max_voltage >= 0)
160		prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MAX;
161	if (info->min_voltage >= 0)
162		prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MIN;
163
164	if (!info->batt_name) {
165		dev_info(&charger->client->dev,
166				"Please consider setting proper battery "
167				"name in platform definition file, falling "
168				"back to name \" Z2_DEFAULT_NAME \"\n");
169		charger->batt_ps.name = Z2_DEFAULT_NAME;
170	} else
171		charger->batt_ps.name = info->batt_name;
172
173	charger->batt_ps.properties		= prop;
174	charger->batt_ps.num_properties		= props;
175	charger->batt_ps.type			= POWER_SUPPLY_TYPE_BATTERY;
176	charger->batt_ps.get_property		= z2_batt_get_property;
177	charger->batt_ps.external_power_changed	= z2_batt_ext_power_changed;
178	charger->batt_ps.use_for_apm		= 1;
179
180	return 0;
181}
182
183static int __devinit z2_batt_probe(struct i2c_client *client,
184				const struct i2c_device_id *id)
185{
186	int ret = 0;
187	int props = 1;	/* POWER_SUPPLY_PROP_PRESENT */
188	struct z2_charger *charger;
189	struct z2_battery_info *info = client->dev.platform_data;
190
191	if (info == NULL) {
192		dev_err(&client->dev,
193			"Please set platform device platform_data"
194			" to a valid z2_battery_info pointer!\n");
195		return -EINVAL;
196	}
197
198	charger = kzalloc(sizeof(*charger), GFP_KERNEL);
199	if (charger == NULL)
200		return -ENOMEM;
201
202	charger->bat_status = POWER_SUPPLY_STATUS_UNKNOWN;
203	charger->info = info;
204	charger->client = client;
205	i2c_set_clientdata(client, charger);
206
207	mutex_init(&charger->work_lock);
208
209	if (info->charge_gpio >= 0 && gpio_is_valid(info->charge_gpio)) {
210		ret = gpio_request(info->charge_gpio, "BATT CHRG");
211		if (ret)
212			goto err;
213
214		ret = gpio_direction_input(info->charge_gpio);
215		if (ret)
216			goto err2;
217
218		irq_set_irq_type(gpio_to_irq(info->charge_gpio),
219				 IRQ_TYPE_EDGE_BOTH);
220		ret = request_irq(gpio_to_irq(info->charge_gpio),
221				z2_charge_switch_irq, IRQF_DISABLED,
222				"AC Detect", charger);
223		if (ret)
224			goto err3;
225	}
226
227	ret = z2_batt_ps_init(charger, props);
228	if (ret)
229		goto err3;
230
231	INIT_WORK(&charger->bat_work, z2_batt_work);
232
233	ret = power_supply_register(&client->dev, &charger->batt_ps);
234	if (ret)
235		goto err4;
236
237	schedule_work(&charger->bat_work);
238
239	return 0;
240
241err4:
242	kfree(charger->batt_ps.properties);
243err3:
244	if (info->charge_gpio >= 0 && gpio_is_valid(info->charge_gpio))
245		free_irq(gpio_to_irq(info->charge_gpio), charger);
246err2:
247	if (info->charge_gpio >= 0 && gpio_is_valid(info->charge_gpio))
248		gpio_free(info->charge_gpio);
249err:
250	kfree(charger);
251	return ret;
252}
253
254static int __devexit z2_batt_remove(struct i2c_client *client)
255{
256	struct z2_charger *charger = i2c_get_clientdata(client);
257	struct z2_battery_info *info = charger->info;
258
259	cancel_work_sync(&charger->bat_work);
260	power_supply_unregister(&charger->batt_ps);
261
262	kfree(charger->batt_ps.properties);
263	if (info->charge_gpio >= 0 && gpio_is_valid(info->charge_gpio)) {
264		free_irq(gpio_to_irq(info->charge_gpio), charger);
265		gpio_free(info->charge_gpio);
266	}
267
268	kfree(charger);
269
270	return 0;
271}
272
273#ifdef CONFIG_PM
274static int z2_batt_suspend(struct device *dev)
275{
276	struct i2c_client *client = to_i2c_client(dev);
277	struct z2_charger *charger = i2c_get_clientdata(client);
278
279	flush_work_sync(&charger->bat_work);
280	return 0;
281}
282
283static int z2_batt_resume(struct device *dev)
284{
285	struct i2c_client *client = to_i2c_client(dev);
286	struct z2_charger *charger = i2c_get_clientdata(client);
287
288	schedule_work(&charger->bat_work);
289	return 0;
290}
291
292static const struct dev_pm_ops z2_battery_pm_ops = {
293	.suspend	= z2_batt_suspend,
294	.resume		= z2_batt_resume,
295};
296
297#define	Z2_BATTERY_PM_OPS	(&z2_battery_pm_ops)
298
299#else
300#define	Z2_BATTERY_PM_OPS	(NULL)
301#endif
302
303static const struct i2c_device_id z2_batt_id[] = {
304	{ "aer915", 0 },
305	{ }
306};
307MODULE_DEVICE_TABLE(i2c, z2_batt_id);
308
309static struct i2c_driver z2_batt_driver = {
310	.driver	= {
311		.name	= "z2-battery",
312		.owner	= THIS_MODULE,
313		.pm	= Z2_BATTERY_PM_OPS
314	},
315	.probe		= z2_batt_probe,
316	.remove		= z2_batt_remove,
317	.id_table	= z2_batt_id,
318};
319
320static int __init z2_batt_init(void)
321{
322	return i2c_add_driver(&z2_batt_driver);
323}
324
325static void __exit z2_batt_exit(void)
326{
327	i2c_del_driver(&z2_batt_driver);
328}
329
330module_init(z2_batt_init);
331module_exit(z2_batt_exit);
332
333MODULE_LICENSE("GPL");
334MODULE_AUTHOR("Peter Edwards <sweetlilmre@gmail.com>");
335MODULE_DESCRIPTION("Zipit Z2 battery driver");