1/*
2 * Battery and Power Management code for the Sharp SL-5x00
3 *
4 * Copyright (C) 2009 Thomas Kunze
5 *
6 * based on tosa_battery.c
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/kernel.h>
14#include <linux/module.h>
15#include <linux/power_supply.h>
16#include <linux/delay.h>
17#include <linux/spinlock.h>
18#include <linux/interrupt.h>
19#include <linux/gpio.h>
20#include <linux/mfd/ucb1x00.h>
21
22#include <asm/mach/sharpsl_param.h>
23#include <asm/mach-types.h>
24#include <mach/collie.h>
25
26static DEFINE_MUTEX(bat_lock); /* protects gpio pins */
27static struct work_struct bat_work;
28static struct ucb1x00 *ucb;
29static int wakeup_enabled;
30
31struct collie_bat {
32	int status;
33	struct power_supply *psy;
34	int full_chrg;
35
36	struct mutex work_lock; /* protects data */
37
38	bool (*is_present)(struct collie_bat *bat);
39	int gpio_full;
40	int gpio_charge_on;
41
42	int technology;
43
44	int gpio_bat;
45	int adc_bat;
46	int adc_bat_divider;
47	int bat_max;
48	int bat_min;
49
50	int gpio_temp;
51	int adc_temp;
52	int adc_temp_divider;
53};
54
55static struct collie_bat collie_bat_main;
56
57static unsigned long collie_read_bat(struct collie_bat *bat)
58{
59	unsigned long value = 0;
60
61	if (bat->gpio_bat < 0 || bat->adc_bat < 0)
62		return 0;
63	mutex_lock(&bat_lock);
64	gpio_set_value(bat->gpio_bat, 1);
65	msleep(5);
66	ucb1x00_adc_enable(ucb);
67	value = ucb1x00_adc_read(ucb, bat->adc_bat, UCB_SYNC);
68	ucb1x00_adc_disable(ucb);
69	gpio_set_value(bat->gpio_bat, 0);
70	mutex_unlock(&bat_lock);
71	value = value * 1000000 / bat->adc_bat_divider;
72
73	return value;
74}
75
76static unsigned long collie_read_temp(struct collie_bat *bat)
77{
78	unsigned long value = 0;
79	if (bat->gpio_temp < 0 || bat->adc_temp < 0)
80		return 0;
81
82	mutex_lock(&bat_lock);
83	gpio_set_value(bat->gpio_temp, 1);
84	msleep(5);
85	ucb1x00_adc_enable(ucb);
86	value = ucb1x00_adc_read(ucb, bat->adc_temp, UCB_SYNC);
87	ucb1x00_adc_disable(ucb);
88	gpio_set_value(bat->gpio_temp, 0);
89	mutex_unlock(&bat_lock);
90
91	value = value * 10000 / bat->adc_temp_divider;
92
93	return value;
94}
95
96static int collie_bat_get_property(struct power_supply *psy,
97			    enum power_supply_property psp,
98			    union power_supply_propval *val)
99{
100	int ret = 0;
101	struct collie_bat *bat = power_supply_get_drvdata(psy);
102
103	if (bat->is_present && !bat->is_present(bat)
104			&& psp != POWER_SUPPLY_PROP_PRESENT) {
105		return -ENODEV;
106	}
107
108	switch (psp) {
109	case POWER_SUPPLY_PROP_STATUS:
110		val->intval = bat->status;
111		break;
112	case POWER_SUPPLY_PROP_TECHNOLOGY:
113		val->intval = bat->technology;
114		break;
115	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
116		val->intval = collie_read_bat(bat);
117		break;
118	case POWER_SUPPLY_PROP_VOLTAGE_MAX:
119		if (bat->full_chrg == -1)
120			val->intval = bat->bat_max;
121		else
122			val->intval = bat->full_chrg;
123		break;
124	case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
125		val->intval = bat->bat_max;
126		break;
127	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
128		val->intval = bat->bat_min;
129		break;
130	case POWER_SUPPLY_PROP_TEMP:
131		val->intval = collie_read_temp(bat);
132		break;
133	case POWER_SUPPLY_PROP_PRESENT:
134		val->intval = bat->is_present ? bat->is_present(bat) : 1;
135		break;
136	default:
137		ret = -EINVAL;
138		break;
139	}
140	return ret;
141}
142
143static void collie_bat_external_power_changed(struct power_supply *psy)
144{
145	schedule_work(&bat_work);
146}
147
148static irqreturn_t collie_bat_gpio_isr(int irq, void *data)
149{
150	pr_info("collie_bat_gpio irq\n");
151	schedule_work(&bat_work);
152	return IRQ_HANDLED;
153}
154
155static void collie_bat_update(struct collie_bat *bat)
156{
157	int old;
158	struct power_supply *psy = bat->psy;
159
160	mutex_lock(&bat->work_lock);
161
162	old = bat->status;
163
164	if (bat->is_present && !bat->is_present(bat)) {
165		printk(KERN_NOTICE "%s not present\n", psy->desc->name);
166		bat->status = POWER_SUPPLY_STATUS_UNKNOWN;
167		bat->full_chrg = -1;
168	} else if (power_supply_am_i_supplied(psy)) {
169		if (bat->status == POWER_SUPPLY_STATUS_DISCHARGING) {
170			gpio_set_value(bat->gpio_charge_on, 1);
171			mdelay(15);
172		}
173
174		if (gpio_get_value(bat->gpio_full)) {
175			if (old == POWER_SUPPLY_STATUS_CHARGING ||
176					bat->full_chrg == -1)
177				bat->full_chrg = collie_read_bat(bat);
178
179			gpio_set_value(bat->gpio_charge_on, 0);
180			bat->status = POWER_SUPPLY_STATUS_FULL;
181		} else {
182			gpio_set_value(bat->gpio_charge_on, 1);
183			bat->status = POWER_SUPPLY_STATUS_CHARGING;
184		}
185	} else {
186		gpio_set_value(bat->gpio_charge_on, 0);
187		bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
188	}
189
190	if (old != bat->status)
191		power_supply_changed(psy);
192
193	mutex_unlock(&bat->work_lock);
194}
195
196static void collie_bat_work(struct work_struct *work)
197{
198	collie_bat_update(&collie_bat_main);
199}
200
201
202static enum power_supply_property collie_bat_main_props[] = {
203	POWER_SUPPLY_PROP_STATUS,
204	POWER_SUPPLY_PROP_TECHNOLOGY,
205	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
206	POWER_SUPPLY_PROP_VOLTAGE_NOW,
207	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
208	POWER_SUPPLY_PROP_VOLTAGE_MAX,
209	POWER_SUPPLY_PROP_PRESENT,
210	POWER_SUPPLY_PROP_TEMP,
211};
212
213static enum power_supply_property collie_bat_bu_props[] = {
214	POWER_SUPPLY_PROP_STATUS,
215	POWER_SUPPLY_PROP_TECHNOLOGY,
216	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
217	POWER_SUPPLY_PROP_VOLTAGE_NOW,
218	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
219	POWER_SUPPLY_PROP_VOLTAGE_MAX,
220	POWER_SUPPLY_PROP_PRESENT,
221};
222
223static const struct power_supply_desc collie_bat_main_desc = {
224	.name		= "main-battery",
225	.type		= POWER_SUPPLY_TYPE_BATTERY,
226	.properties	= collie_bat_main_props,
227	.num_properties	= ARRAY_SIZE(collie_bat_main_props),
228	.get_property	= collie_bat_get_property,
229	.external_power_changed = collie_bat_external_power_changed,
230	.use_for_apm	= 1,
231};
232
233static struct collie_bat collie_bat_main = {
234	.status = POWER_SUPPLY_STATUS_DISCHARGING,
235	.full_chrg = -1,
236	.psy = NULL,
237
238	.gpio_full = COLLIE_GPIO_CO,
239	.gpio_charge_on = COLLIE_GPIO_CHARGE_ON,
240
241	.technology = POWER_SUPPLY_TECHNOLOGY_LIPO,
242
243	.gpio_bat = COLLIE_GPIO_MBAT_ON,
244	.adc_bat = UCB_ADC_INP_AD1,
245	.adc_bat_divider = 155,
246	.bat_max = 4310000,
247	.bat_min = 1551 * 1000000 / 414,
248
249	.gpio_temp = COLLIE_GPIO_TMP_ON,
250	.adc_temp = UCB_ADC_INP_AD0,
251	.adc_temp_divider = 10000,
252};
253
254static const struct power_supply_desc collie_bat_bu_desc = {
255	.name		= "backup-battery",
256	.type		= POWER_SUPPLY_TYPE_BATTERY,
257	.properties	= collie_bat_bu_props,
258	.num_properties	= ARRAY_SIZE(collie_bat_bu_props),
259	.get_property	= collie_bat_get_property,
260	.external_power_changed = collie_bat_external_power_changed,
261};
262
263static struct collie_bat collie_bat_bu = {
264	.status = POWER_SUPPLY_STATUS_UNKNOWN,
265	.full_chrg = -1,
266	.psy = NULL,
267
268	.gpio_full = -1,
269	.gpio_charge_on = -1,
270
271	.technology = POWER_SUPPLY_TECHNOLOGY_LiMn,
272
273	.gpio_bat = COLLIE_GPIO_BBAT_ON,
274	.adc_bat = UCB_ADC_INP_AD1,
275	.adc_bat_divider = 155,
276	.bat_max = 3000000,
277	.bat_min = 1900000,
278
279	.gpio_temp = -1,
280	.adc_temp = -1,
281	.adc_temp_divider = -1,
282};
283
284static struct gpio collie_batt_gpios[] = {
285	{ COLLIE_GPIO_CO,	    GPIOF_IN,		"main battery full" },
286	{ COLLIE_GPIO_MAIN_BAT_LOW, GPIOF_IN,		"main battery low" },
287	{ COLLIE_GPIO_CHARGE_ON,    GPIOF_OUT_INIT_LOW,	"main charge on" },
288	{ COLLIE_GPIO_MBAT_ON,	    GPIOF_OUT_INIT_LOW,	"main battery" },
289	{ COLLIE_GPIO_TMP_ON,	    GPIOF_OUT_INIT_LOW,	"main battery temp" },
290	{ COLLIE_GPIO_BBAT_ON,	    GPIOF_OUT_INIT_LOW,	"backup battery" },
291};
292
293#ifdef CONFIG_PM
294static int collie_bat_suspend(struct ucb1x00_dev *dev)
295{
296	/* flush all pending status updates */
297	flush_work(&bat_work);
298
299	if (device_may_wakeup(&dev->ucb->dev) &&
300	    collie_bat_main.status == POWER_SUPPLY_STATUS_CHARGING)
301		wakeup_enabled = !enable_irq_wake(gpio_to_irq(COLLIE_GPIO_CO));
302	else
303		wakeup_enabled = 0;
304
305	return 0;
306}
307
308static int collie_bat_resume(struct ucb1x00_dev *dev)
309{
310	if (wakeup_enabled)
311		disable_irq_wake(gpio_to_irq(COLLIE_GPIO_CO));
312
313	/* things may have changed while we were away */
314	schedule_work(&bat_work);
315	return 0;
316}
317#else
318#define collie_bat_suspend NULL
319#define collie_bat_resume NULL
320#endif
321
322static int collie_bat_probe(struct ucb1x00_dev *dev)
323{
324	int ret;
325	struct power_supply_config psy_main_cfg = {}, psy_bu_cfg = {};
326
327	if (!machine_is_collie())
328		return -ENODEV;
329
330	ucb = dev->ucb;
331
332	ret = gpio_request_array(collie_batt_gpios,
333				 ARRAY_SIZE(collie_batt_gpios));
334	if (ret)
335		return ret;
336
337	mutex_init(&collie_bat_main.work_lock);
338
339	INIT_WORK(&bat_work, collie_bat_work);
340
341	psy_main_cfg.drv_data = &collie_bat_main;
342	collie_bat_main.psy = power_supply_register(&dev->ucb->dev,
343						    &collie_bat_main_desc,
344						    &psy_main_cfg);
345	if (IS_ERR(collie_bat_main.psy)) {
346		ret = PTR_ERR(collie_bat_main.psy);
347		goto err_psy_reg_main;
348	}
349
350	psy_bu_cfg.drv_data = &collie_bat_bu;
351	collie_bat_bu.psy = power_supply_register(&dev->ucb->dev,
352						  &collie_bat_bu_desc,
353						  &psy_bu_cfg);
354	if (IS_ERR(collie_bat_bu.psy)) {
355		ret = PTR_ERR(collie_bat_bu.psy);
356		goto err_psy_reg_bu;
357	}
358
359	ret = request_irq(gpio_to_irq(COLLIE_GPIO_CO),
360				collie_bat_gpio_isr,
361				IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
362				"main full", &collie_bat_main);
363	if (ret)
364		goto err_irq;
365
366	device_init_wakeup(&ucb->dev, 1);
367	schedule_work(&bat_work);
368
369	return 0;
370
371err_irq:
372	power_supply_unregister(collie_bat_bu.psy);
373err_psy_reg_bu:
374	power_supply_unregister(collie_bat_main.psy);
375err_psy_reg_main:
376
377	/* see comment in collie_bat_remove */
378	cancel_work_sync(&bat_work);
379	gpio_free_array(collie_batt_gpios, ARRAY_SIZE(collie_batt_gpios));
380	return ret;
381}
382
383static void collie_bat_remove(struct ucb1x00_dev *dev)
384{
385	free_irq(gpio_to_irq(COLLIE_GPIO_CO), &collie_bat_main);
386
387	power_supply_unregister(collie_bat_bu.psy);
388	power_supply_unregister(collie_bat_main.psy);
389
390	/*
391	 * Now cancel the bat_work.  We won't get any more schedules,
392	 * since all sources (isr and external_power_changed) are
393	 * unregistered now.
394	 */
395	cancel_work_sync(&bat_work);
396	gpio_free_array(collie_batt_gpios, ARRAY_SIZE(collie_batt_gpios));
397}
398
399static struct ucb1x00_driver collie_bat_driver = {
400	.add		= collie_bat_probe,
401	.remove		= collie_bat_remove,
402	.suspend	= collie_bat_suspend,
403	.resume		= collie_bat_resume,
404};
405
406static int __init collie_bat_init(void)
407{
408	return ucb1x00_register_driver(&collie_bat_driver);
409}
410
411static void __exit collie_bat_exit(void)
412{
413	ucb1x00_unregister_driver(&collie_bat_driver);
414}
415
416module_init(collie_bat_init);
417module_exit(collie_bat_exit);
418
419MODULE_LICENSE("GPL");
420MODULE_AUTHOR("Thomas Kunze");
421MODULE_DESCRIPTION("Collie battery driver");
422