1/*
2 * Battery and Power Management code for the Sharp SL-6000x
3 *
4 * Copyright (c) 2005 Dirk Opfer
5 * Copyright (c) 2008 Dmitry Baryshkov
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 */
12#include <linux/kernel.h>
13#include <linux/module.h>
14#include <linux/power_supply.h>
15#include <linux/wm97xx.h>
16#include <linux/delay.h>
17#include <linux/spinlock.h>
18#include <linux/interrupt.h>
19#include <linux/gpio.h>
20
21#include <asm/mach-types.h>
22#include <mach/tosa.h>
23
24static DEFINE_MUTEX(bat_lock); /* protects gpio pins */
25static struct work_struct bat_work;
26
27struct tosa_bat {
28	int status;
29	struct power_supply *psy;
30	int full_chrg;
31
32	struct mutex work_lock; /* protects data */
33
34	bool (*is_present)(struct tosa_bat *bat);
35	int gpio_full;
36	int gpio_charge_off;
37
38	int technology;
39
40	int gpio_bat;
41	int adc_bat;
42	int adc_bat_divider;
43	int bat_max;
44	int bat_min;
45
46	int gpio_temp;
47	int adc_temp;
48	int adc_temp_divider;
49};
50
51static struct tosa_bat tosa_bat_main;
52static struct tosa_bat tosa_bat_jacket;
53
54static unsigned long tosa_read_bat(struct tosa_bat *bat)
55{
56	unsigned long value = 0;
57
58	if (bat->gpio_bat < 0 || bat->adc_bat < 0)
59		return 0;
60
61	mutex_lock(&bat_lock);
62	gpio_set_value(bat->gpio_bat, 1);
63	msleep(5);
64	value = wm97xx_read_aux_adc(dev_get_drvdata(bat->psy->dev.parent),
65			bat->adc_bat);
66	gpio_set_value(bat->gpio_bat, 0);
67	mutex_unlock(&bat_lock);
68
69	value = value * 1000000 / bat->adc_bat_divider;
70
71	return value;
72}
73
74static unsigned long tosa_read_temp(struct tosa_bat *bat)
75{
76	unsigned long value = 0;
77
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	value = wm97xx_read_aux_adc(dev_get_drvdata(bat->psy->dev.parent),
85			bat->adc_temp);
86	gpio_set_value(bat->gpio_temp, 0);
87	mutex_unlock(&bat_lock);
88
89	value = value * 10000 / bat->adc_temp_divider;
90
91	return value;
92}
93
94static int tosa_bat_get_property(struct power_supply *psy,
95			    enum power_supply_property psp,
96			    union power_supply_propval *val)
97{
98	int ret = 0;
99	struct tosa_bat *bat = power_supply_get_drvdata(psy);
100
101	if (bat->is_present && !bat->is_present(bat)
102			&& psp != POWER_SUPPLY_PROP_PRESENT) {
103		return -ENODEV;
104	}
105
106	switch (psp) {
107	case POWER_SUPPLY_PROP_STATUS:
108		val->intval = bat->status;
109		break;
110	case POWER_SUPPLY_PROP_TECHNOLOGY:
111		val->intval = bat->technology;
112		break;
113	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
114		val->intval = tosa_read_bat(bat);
115		break;
116	case POWER_SUPPLY_PROP_VOLTAGE_MAX:
117		if (bat->full_chrg == -1)
118			val->intval = bat->bat_max;
119		else
120			val->intval = bat->full_chrg;
121		break;
122	case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
123		val->intval = bat->bat_max;
124		break;
125	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
126		val->intval = bat->bat_min;
127		break;
128	case POWER_SUPPLY_PROP_TEMP:
129		val->intval = tosa_read_temp(bat);
130		break;
131	case POWER_SUPPLY_PROP_PRESENT:
132		val->intval = bat->is_present ? bat->is_present(bat) : 1;
133		break;
134	default:
135		ret = -EINVAL;
136		break;
137	}
138	return ret;
139}
140
141static bool tosa_jacket_bat_is_present(struct tosa_bat *bat)
142{
143	return gpio_get_value(TOSA_GPIO_JACKET_DETECT) == 0;
144}
145
146static void tosa_bat_external_power_changed(struct power_supply *psy)
147{
148	schedule_work(&bat_work);
149}
150
151static irqreturn_t tosa_bat_gpio_isr(int irq, void *data)
152{
153	pr_info("tosa_bat_gpio irq\n");
154	schedule_work(&bat_work);
155	return IRQ_HANDLED;
156}
157
158static void tosa_bat_update(struct tosa_bat *bat)
159{
160	int old;
161	struct power_supply *psy = bat->psy;
162
163	mutex_lock(&bat->work_lock);
164
165	old = bat->status;
166
167	if (bat->is_present && !bat->is_present(bat)) {
168		printk(KERN_NOTICE "%s not present\n", psy->desc->name);
169		bat->status = POWER_SUPPLY_STATUS_UNKNOWN;
170		bat->full_chrg = -1;
171	} else if (power_supply_am_i_supplied(psy)) {
172		if (bat->status == POWER_SUPPLY_STATUS_DISCHARGING) {
173			gpio_set_value(bat->gpio_charge_off, 0);
174			mdelay(15);
175		}
176
177		if (gpio_get_value(bat->gpio_full)) {
178			if (old == POWER_SUPPLY_STATUS_CHARGING ||
179					bat->full_chrg == -1)
180				bat->full_chrg = tosa_read_bat(bat);
181
182			gpio_set_value(bat->gpio_charge_off, 1);
183			bat->status = POWER_SUPPLY_STATUS_FULL;
184		} else {
185			gpio_set_value(bat->gpio_charge_off, 0);
186			bat->status = POWER_SUPPLY_STATUS_CHARGING;
187		}
188	} else {
189		gpio_set_value(bat->gpio_charge_off, 1);
190		bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
191	}
192
193	if (old != bat->status)
194		power_supply_changed(psy);
195
196	mutex_unlock(&bat->work_lock);
197}
198
199static void tosa_bat_work(struct work_struct *work)
200{
201	tosa_bat_update(&tosa_bat_main);
202	tosa_bat_update(&tosa_bat_jacket);
203}
204
205
206static enum power_supply_property tosa_bat_main_props[] = {
207	POWER_SUPPLY_PROP_STATUS,
208	POWER_SUPPLY_PROP_TECHNOLOGY,
209	POWER_SUPPLY_PROP_VOLTAGE_NOW,
210	POWER_SUPPLY_PROP_VOLTAGE_MAX,
211	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
212	POWER_SUPPLY_PROP_TEMP,
213	POWER_SUPPLY_PROP_PRESENT,
214};
215
216static enum power_supply_property tosa_bat_bu_props[] = {
217	POWER_SUPPLY_PROP_STATUS,
218	POWER_SUPPLY_PROP_TECHNOLOGY,
219	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
220	POWER_SUPPLY_PROP_VOLTAGE_NOW,
221	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
222	POWER_SUPPLY_PROP_PRESENT,
223};
224
225static const struct power_supply_desc tosa_bat_main_desc = {
226	.name		= "main-battery",
227	.type		= POWER_SUPPLY_TYPE_BATTERY,
228	.properties	= tosa_bat_main_props,
229	.num_properties	= ARRAY_SIZE(tosa_bat_main_props),
230	.get_property	= tosa_bat_get_property,
231	.external_power_changed = tosa_bat_external_power_changed,
232	.use_for_apm	= 1,
233};
234
235static const struct power_supply_desc tosa_bat_jacket_desc = {
236	.name		= "jacket-battery",
237	.type		= POWER_SUPPLY_TYPE_BATTERY,
238	.properties	= tosa_bat_main_props,
239	.num_properties	= ARRAY_SIZE(tosa_bat_main_props),
240	.get_property	= tosa_bat_get_property,
241	.external_power_changed = tosa_bat_external_power_changed,
242};
243
244static const struct power_supply_desc tosa_bat_bu_desc = {
245	.name		= "backup-battery",
246	.type		= POWER_SUPPLY_TYPE_BATTERY,
247	.properties	= tosa_bat_bu_props,
248	.num_properties	= ARRAY_SIZE(tosa_bat_bu_props),
249	.get_property	= tosa_bat_get_property,
250	.external_power_changed = tosa_bat_external_power_changed,
251};
252
253static struct tosa_bat tosa_bat_main = {
254	.status = POWER_SUPPLY_STATUS_DISCHARGING,
255	.full_chrg = -1,
256	.psy = NULL,
257
258	.gpio_full = TOSA_GPIO_BAT0_CRG,
259	.gpio_charge_off = TOSA_GPIO_CHARGE_OFF,
260
261	.technology = POWER_SUPPLY_TECHNOLOGY_LIPO,
262
263	.gpio_bat = TOSA_GPIO_BAT0_V_ON,
264	.adc_bat = WM97XX_AUX_ID3,
265	.adc_bat_divider = 414,
266	.bat_max = 4310000,
267	.bat_min = 1551 * 1000000 / 414,
268
269	.gpio_temp = TOSA_GPIO_BAT1_TH_ON,
270	.adc_temp = WM97XX_AUX_ID2,
271	.adc_temp_divider = 10000,
272};
273
274static struct tosa_bat tosa_bat_jacket = {
275	.status = POWER_SUPPLY_STATUS_DISCHARGING,
276	.full_chrg = -1,
277	.psy = NULL,
278
279	.is_present = tosa_jacket_bat_is_present,
280	.gpio_full = TOSA_GPIO_BAT1_CRG,
281	.gpio_charge_off = TOSA_GPIO_CHARGE_OFF_JC,
282
283	.technology = POWER_SUPPLY_TECHNOLOGY_LIPO,
284
285	.gpio_bat = TOSA_GPIO_BAT1_V_ON,
286	.adc_bat = WM97XX_AUX_ID3,
287	.adc_bat_divider = 414,
288	.bat_max = 4310000,
289	.bat_min = 1551 * 1000000 / 414,
290
291	.gpio_temp = TOSA_GPIO_BAT0_TH_ON,
292	.adc_temp = WM97XX_AUX_ID2,
293	.adc_temp_divider = 10000,
294};
295
296static struct tosa_bat tosa_bat_bu = {
297	.status = POWER_SUPPLY_STATUS_UNKNOWN,
298	.full_chrg = -1,
299	.psy = NULL,
300
301	.gpio_full = -1,
302	.gpio_charge_off = -1,
303
304	.technology = POWER_SUPPLY_TECHNOLOGY_LiMn,
305
306	.gpio_bat = TOSA_GPIO_BU_CHRG_ON,
307	.adc_bat = WM97XX_AUX_ID4,
308	.adc_bat_divider = 1266,
309
310	.gpio_temp = -1,
311	.adc_temp = -1,
312	.adc_temp_divider = -1,
313};
314
315static struct gpio tosa_bat_gpios[] = {
316	{ TOSA_GPIO_CHARGE_OFF,	   GPIOF_OUT_INIT_HIGH, "main charge off" },
317	{ TOSA_GPIO_CHARGE_OFF_JC, GPIOF_OUT_INIT_HIGH, "jacket charge off" },
318	{ TOSA_GPIO_BAT_SW_ON,	   GPIOF_OUT_INIT_LOW,	"battery switch" },
319	{ TOSA_GPIO_BAT0_V_ON,	   GPIOF_OUT_INIT_LOW,	"main battery" },
320	{ TOSA_GPIO_BAT1_V_ON,	   GPIOF_OUT_INIT_LOW,	"jacket battery" },
321	{ TOSA_GPIO_BAT1_TH_ON,	   GPIOF_OUT_INIT_LOW,	"main battery temp" },
322	{ TOSA_GPIO_BAT0_TH_ON,	   GPIOF_OUT_INIT_LOW,	"jacket battery temp" },
323	{ TOSA_GPIO_BU_CHRG_ON,	   GPIOF_OUT_INIT_LOW,	"backup battery" },
324	{ TOSA_GPIO_BAT0_CRG,	   GPIOF_IN,		"main battery full" },
325	{ TOSA_GPIO_BAT1_CRG,	   GPIOF_IN,		"jacket battery full" },
326	{ TOSA_GPIO_BAT0_LOW,	   GPIOF_IN,		"main battery low" },
327	{ TOSA_GPIO_BAT1_LOW,	   GPIOF_IN,		"jacket battery low" },
328	{ TOSA_GPIO_JACKET_DETECT, GPIOF_IN,		"jacket detect" },
329};
330
331#ifdef CONFIG_PM
332static int tosa_bat_suspend(struct platform_device *dev, pm_message_t state)
333{
334	/* flush all pending status updates */
335	flush_work(&bat_work);
336	return 0;
337}
338
339static int tosa_bat_resume(struct platform_device *dev)
340{
341	/* things may have changed while we were away */
342	schedule_work(&bat_work);
343	return 0;
344}
345#else
346#define tosa_bat_suspend NULL
347#define tosa_bat_resume NULL
348#endif
349
350static int tosa_bat_probe(struct platform_device *dev)
351{
352	int ret;
353	struct power_supply_config main_psy_cfg = {},
354				   jacket_psy_cfg = {},
355				   bu_psy_cfg = {};
356
357	if (!machine_is_tosa())
358		return -ENODEV;
359
360	ret = gpio_request_array(tosa_bat_gpios, ARRAY_SIZE(tosa_bat_gpios));
361	if (ret)
362		return ret;
363
364	mutex_init(&tosa_bat_main.work_lock);
365	mutex_init(&tosa_bat_jacket.work_lock);
366
367	INIT_WORK(&bat_work, tosa_bat_work);
368
369	main_psy_cfg.drv_data = &tosa_bat_main;
370	tosa_bat_main.psy = power_supply_register(&dev->dev,
371						  &tosa_bat_main_desc,
372						  &main_psy_cfg);
373	if (IS_ERR(tosa_bat_main.psy)) {
374		ret = PTR_ERR(tosa_bat_main.psy);
375		goto err_psy_reg_main;
376	}
377
378	jacket_psy_cfg.drv_data = &tosa_bat_jacket;
379	tosa_bat_jacket.psy = power_supply_register(&dev->dev,
380						    &tosa_bat_jacket_desc,
381						    &jacket_psy_cfg);
382	if (IS_ERR(tosa_bat_jacket.psy)) {
383		ret = PTR_ERR(tosa_bat_jacket.psy);
384		goto err_psy_reg_jacket;
385	}
386
387	bu_psy_cfg.drv_data = &tosa_bat_bu;
388	tosa_bat_bu.psy = power_supply_register(&dev->dev, &tosa_bat_bu_desc,
389						&bu_psy_cfg);
390	if (IS_ERR(tosa_bat_bu.psy)) {
391		ret = PTR_ERR(tosa_bat_bu.psy);
392		goto err_psy_reg_bu;
393	}
394
395	ret = request_irq(gpio_to_irq(TOSA_GPIO_BAT0_CRG),
396				tosa_bat_gpio_isr,
397				IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
398				"main full", &tosa_bat_main);
399	if (ret)
400		goto err_req_main;
401
402	ret = request_irq(gpio_to_irq(TOSA_GPIO_BAT1_CRG),
403				tosa_bat_gpio_isr,
404				IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
405				"jacket full", &tosa_bat_jacket);
406	if (ret)
407		goto err_req_jacket;
408
409	ret = request_irq(gpio_to_irq(TOSA_GPIO_JACKET_DETECT),
410				tosa_bat_gpio_isr,
411				IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
412				"jacket detect", &tosa_bat_jacket);
413	if (!ret) {
414		schedule_work(&bat_work);
415		return 0;
416	}
417
418	free_irq(gpio_to_irq(TOSA_GPIO_BAT1_CRG), &tosa_bat_jacket);
419err_req_jacket:
420	free_irq(gpio_to_irq(TOSA_GPIO_BAT0_CRG), &tosa_bat_main);
421err_req_main:
422	power_supply_unregister(tosa_bat_bu.psy);
423err_psy_reg_bu:
424	power_supply_unregister(tosa_bat_jacket.psy);
425err_psy_reg_jacket:
426	power_supply_unregister(tosa_bat_main.psy);
427err_psy_reg_main:
428
429	/* see comment in tosa_bat_remove */
430	cancel_work_sync(&bat_work);
431
432	gpio_free_array(tosa_bat_gpios, ARRAY_SIZE(tosa_bat_gpios));
433	return ret;
434}
435
436static int tosa_bat_remove(struct platform_device *dev)
437{
438	free_irq(gpio_to_irq(TOSA_GPIO_JACKET_DETECT), &tosa_bat_jacket);
439	free_irq(gpio_to_irq(TOSA_GPIO_BAT1_CRG), &tosa_bat_jacket);
440	free_irq(gpio_to_irq(TOSA_GPIO_BAT0_CRG), &tosa_bat_main);
441
442	power_supply_unregister(tosa_bat_bu.psy);
443	power_supply_unregister(tosa_bat_jacket.psy);
444	power_supply_unregister(tosa_bat_main.psy);
445
446	/*
447	 * Now cancel the bat_work.  We won't get any more schedules,
448	 * since all sources (isr and external_power_changed) are
449	 * unregistered now.
450	 */
451	cancel_work_sync(&bat_work);
452	gpio_free_array(tosa_bat_gpios, ARRAY_SIZE(tosa_bat_gpios));
453	return 0;
454}
455
456static struct platform_driver tosa_bat_driver = {
457	.driver.name	= "wm97xx-battery",
458	.driver.owner	= THIS_MODULE,
459	.probe		= tosa_bat_probe,
460	.remove		= tosa_bat_remove,
461	.suspend	= tosa_bat_suspend,
462	.resume		= tosa_bat_resume,
463};
464
465module_platform_driver(tosa_bat_driver);
466
467MODULE_LICENSE("GPL");
468MODULE_AUTHOR("Dmitry Baryshkov");
469MODULE_DESCRIPTION("Tosa battery driver");
470MODULE_ALIAS("platform:wm97xx-battery");
471