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