1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Battery and Power Management code for the Sharp SL-6000x
4 *
5 * Copyright (c) 2005 Dirk Opfer
6 * Copyright (c) 2008 Dmitry Baryshkov
7 */
8#include <linux/kernel.h>
9#include <linux/module.h>
10#include <linux/power_supply.h>
11#include <linux/wm97xx.h>
12#include <linux/delay.h>
13#include <linux/spinlock.h>
14#include <linux/interrupt.h>
15#include <linux/gpio.h>
16
17#include <asm/mach-types.h>
18#include <mach/tosa.h>
19
20static DEFINE_MUTEX(bat_lock); /* protects gpio pins */
21static struct work_struct bat_work;
22
23struct tosa_bat {
24	int status;
25	struct power_supply *psy;
26	int full_chrg;
27
28	struct mutex work_lock; /* protects data */
29
30	bool (*is_present)(struct tosa_bat *bat);
31	int gpio_full;
32	int gpio_charge_off;
33
34	int technology;
35
36	int gpio_bat;
37	int adc_bat;
38	int adc_bat_divider;
39	int bat_max;
40	int bat_min;
41
42	int gpio_temp;
43	int adc_temp;
44	int adc_temp_divider;
45};
46
47static struct tosa_bat tosa_bat_main;
48static struct tosa_bat tosa_bat_jacket;
49
50static unsigned long tosa_read_bat(struct tosa_bat *bat)
51{
52	unsigned long value = 0;
53
54	if (bat->gpio_bat < 0 || bat->adc_bat < 0)
55		return 0;
56
57	mutex_lock(&bat_lock);
58	gpio_set_value(bat->gpio_bat, 1);
59	msleep(5);
60	value = wm97xx_read_aux_adc(dev_get_drvdata(bat->psy->dev.parent),
61			bat->adc_bat);
62	gpio_set_value(bat->gpio_bat, 0);
63	mutex_unlock(&bat_lock);
64
65	value = value * 1000000 / bat->adc_bat_divider;
66
67	return value;
68}
69
70static unsigned long tosa_read_temp(struct tosa_bat *bat)
71{
72	unsigned long value = 0;
73
74	if (bat->gpio_temp < 0 || bat->adc_temp < 0)
75		return 0;
76
77	mutex_lock(&bat_lock);
78	gpio_set_value(bat->gpio_temp, 1);
79	msleep(5);
80	value = wm97xx_read_aux_adc(dev_get_drvdata(bat->psy->dev.parent),
81			bat->adc_temp);
82	gpio_set_value(bat->gpio_temp, 0);
83	mutex_unlock(&bat_lock);
84
85	value = value * 10000 / bat->adc_temp_divider;
86
87	return value;
88}
89
90static int tosa_bat_get_property(struct power_supply *psy,
91			    enum power_supply_property psp,
92			    union power_supply_propval *val)
93{
94	int ret = 0;
95	struct tosa_bat *bat = power_supply_get_drvdata(psy);
96
97	if (bat->is_present && !bat->is_present(bat)
98			&& psp != POWER_SUPPLY_PROP_PRESENT) {
99		return -ENODEV;
100	}
101
102	switch (psp) {
103	case POWER_SUPPLY_PROP_STATUS:
104		val->intval = bat->status;
105		break;
106	case POWER_SUPPLY_PROP_TECHNOLOGY:
107		val->intval = bat->technology;
108		break;
109	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
110		val->intval = tosa_read_bat(bat);
111		break;
112	case POWER_SUPPLY_PROP_VOLTAGE_MAX:
113		if (bat->full_chrg == -1)
114			val->intval = bat->bat_max;
115		else
116			val->intval = bat->full_chrg;
117		break;
118	case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
119		val->intval = bat->bat_max;
120		break;
121	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
122		val->intval = bat->bat_min;
123		break;
124	case POWER_SUPPLY_PROP_TEMP:
125		val->intval = tosa_read_temp(bat);
126		break;
127	case POWER_SUPPLY_PROP_PRESENT:
128		val->intval = bat->is_present ? bat->is_present(bat) : 1;
129		break;
130	default:
131		ret = -EINVAL;
132		break;
133	}
134	return ret;
135}
136
137static bool tosa_jacket_bat_is_present(struct tosa_bat *bat)
138{
139	return gpio_get_value(TOSA_GPIO_JACKET_DETECT) == 0;
140}
141
142static void tosa_bat_external_power_changed(struct power_supply *psy)
143{
144	schedule_work(&bat_work);
145}
146
147static irqreturn_t tosa_bat_gpio_isr(int irq, void *data)
148{
149	pr_info("tosa_bat_gpio irq\n");
150	schedule_work(&bat_work);
151	return IRQ_HANDLED;
152}
153
154static void tosa_bat_update(struct tosa_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->desc->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_off, 0);
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 = tosa_read_bat(bat);
177
178			gpio_set_value(bat->gpio_charge_off, 1);
179			bat->status = POWER_SUPPLY_STATUS_FULL;
180		} else {
181			gpio_set_value(bat->gpio_charge_off, 0);
182			bat->status = POWER_SUPPLY_STATUS_CHARGING;
183		}
184	} else {
185		gpio_set_value(bat->gpio_charge_off, 1);
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 tosa_bat_work(struct work_struct *work)
196{
197	tosa_bat_update(&tosa_bat_main);
198	tosa_bat_update(&tosa_bat_jacket);
199}
200
201
202static enum power_supply_property tosa_bat_main_props[] = {
203	POWER_SUPPLY_PROP_STATUS,
204	POWER_SUPPLY_PROP_TECHNOLOGY,
205	POWER_SUPPLY_PROP_VOLTAGE_NOW,
206	POWER_SUPPLY_PROP_VOLTAGE_MAX,
207	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
208	POWER_SUPPLY_PROP_TEMP,
209	POWER_SUPPLY_PROP_PRESENT,
210};
211
212static enum power_supply_property tosa_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_PRESENT,
219};
220
221static const struct power_supply_desc tosa_bat_main_desc = {
222	.name		= "main-battery",
223	.type		= POWER_SUPPLY_TYPE_BATTERY,
224	.properties	= tosa_bat_main_props,
225	.num_properties	= ARRAY_SIZE(tosa_bat_main_props),
226	.get_property	= tosa_bat_get_property,
227	.external_power_changed = tosa_bat_external_power_changed,
228	.use_for_apm	= 1,
229};
230
231static const struct power_supply_desc tosa_bat_jacket_desc = {
232	.name		= "jacket-battery",
233	.type		= POWER_SUPPLY_TYPE_BATTERY,
234	.properties	= tosa_bat_main_props,
235	.num_properties	= ARRAY_SIZE(tosa_bat_main_props),
236	.get_property	= tosa_bat_get_property,
237	.external_power_changed = tosa_bat_external_power_changed,
238};
239
240static const struct power_supply_desc tosa_bat_bu_desc = {
241	.name		= "backup-battery",
242	.type		= POWER_SUPPLY_TYPE_BATTERY,
243	.properties	= tosa_bat_bu_props,
244	.num_properties	= ARRAY_SIZE(tosa_bat_bu_props),
245	.get_property	= tosa_bat_get_property,
246	.external_power_changed = tosa_bat_external_power_changed,
247};
248
249static struct tosa_bat tosa_bat_main = {
250	.status = POWER_SUPPLY_STATUS_DISCHARGING,
251	.full_chrg = -1,
252	.psy = NULL,
253
254	.gpio_full = TOSA_GPIO_BAT0_CRG,
255	.gpio_charge_off = TOSA_GPIO_CHARGE_OFF,
256
257	.technology = POWER_SUPPLY_TECHNOLOGY_LIPO,
258
259	.gpio_bat = TOSA_GPIO_BAT0_V_ON,
260	.adc_bat = WM97XX_AUX_ID3,
261	.adc_bat_divider = 414,
262	.bat_max = 4310000,
263	.bat_min = 1551 * 1000000 / 414,
264
265	.gpio_temp = TOSA_GPIO_BAT1_TH_ON,
266	.adc_temp = WM97XX_AUX_ID2,
267	.adc_temp_divider = 10000,
268};
269
270static struct tosa_bat tosa_bat_jacket = {
271	.status = POWER_SUPPLY_STATUS_DISCHARGING,
272	.full_chrg = -1,
273	.psy = NULL,
274
275	.is_present = tosa_jacket_bat_is_present,
276	.gpio_full = TOSA_GPIO_BAT1_CRG,
277	.gpio_charge_off = TOSA_GPIO_CHARGE_OFF_JC,
278
279	.technology = POWER_SUPPLY_TECHNOLOGY_LIPO,
280
281	.gpio_bat = TOSA_GPIO_BAT1_V_ON,
282	.adc_bat = WM97XX_AUX_ID3,
283	.adc_bat_divider = 414,
284	.bat_max = 4310000,
285	.bat_min = 1551 * 1000000 / 414,
286
287	.gpio_temp = TOSA_GPIO_BAT0_TH_ON,
288	.adc_temp = WM97XX_AUX_ID2,
289	.adc_temp_divider = 10000,
290};
291
292static struct tosa_bat tosa_bat_bu = {
293	.status = POWER_SUPPLY_STATUS_UNKNOWN,
294	.full_chrg = -1,
295	.psy = NULL,
296
297	.gpio_full = -1,
298	.gpio_charge_off = -1,
299
300	.technology = POWER_SUPPLY_TECHNOLOGY_LiMn,
301
302	.gpio_bat = TOSA_GPIO_BU_CHRG_ON,
303	.adc_bat = WM97XX_AUX_ID4,
304	.adc_bat_divider = 1266,
305
306	.gpio_temp = -1,
307	.adc_temp = -1,
308	.adc_temp_divider = -1,
309};
310
311static struct gpio tosa_bat_gpios[] = {
312	{ TOSA_GPIO_CHARGE_OFF,	   GPIOF_OUT_INIT_HIGH, "main charge off" },
313	{ TOSA_GPIO_CHARGE_OFF_JC, GPIOF_OUT_INIT_HIGH, "jacket charge off" },
314	{ TOSA_GPIO_BAT_SW_ON,	   GPIOF_OUT_INIT_LOW,	"battery switch" },
315	{ TOSA_GPIO_BAT0_V_ON,	   GPIOF_OUT_INIT_LOW,	"main battery" },
316	{ TOSA_GPIO_BAT1_V_ON,	   GPIOF_OUT_INIT_LOW,	"jacket battery" },
317	{ TOSA_GPIO_BAT1_TH_ON,	   GPIOF_OUT_INIT_LOW,	"main battery temp" },
318	{ TOSA_GPIO_BAT0_TH_ON,	   GPIOF_OUT_INIT_LOW,	"jacket battery temp" },
319	{ TOSA_GPIO_BU_CHRG_ON,	   GPIOF_OUT_INIT_LOW,	"backup battery" },
320	{ TOSA_GPIO_BAT0_CRG,	   GPIOF_IN,		"main battery full" },
321	{ TOSA_GPIO_BAT1_CRG,	   GPIOF_IN,		"jacket battery full" },
322	{ TOSA_GPIO_BAT0_LOW,	   GPIOF_IN,		"main battery low" },
323	{ TOSA_GPIO_BAT1_LOW,	   GPIOF_IN,		"jacket battery low" },
324	{ TOSA_GPIO_JACKET_DETECT, GPIOF_IN,		"jacket detect" },
325};
326
327#ifdef CONFIG_PM
328static int tosa_bat_suspend(struct platform_device *dev, pm_message_t state)
329{
330	/* flush all pending status updates */
331	flush_work(&bat_work);
332	return 0;
333}
334
335static int tosa_bat_resume(struct platform_device *dev)
336{
337	/* things may have changed while we were away */
338	schedule_work(&bat_work);
339	return 0;
340}
341#else
342#define tosa_bat_suspend NULL
343#define tosa_bat_resume NULL
344#endif
345
346static int tosa_bat_probe(struct platform_device *dev)
347{
348	int ret;
349	struct power_supply_config main_psy_cfg = {},
350				   jacket_psy_cfg = {},
351				   bu_psy_cfg = {};
352
353	if (!machine_is_tosa())
354		return -ENODEV;
355
356	ret = gpio_request_array(tosa_bat_gpios, ARRAY_SIZE(tosa_bat_gpios));
357	if (ret)
358		return ret;
359
360	mutex_init(&tosa_bat_main.work_lock);
361	mutex_init(&tosa_bat_jacket.work_lock);
362
363	INIT_WORK(&bat_work, tosa_bat_work);
364
365	main_psy_cfg.drv_data = &tosa_bat_main;
366	tosa_bat_main.psy = power_supply_register(&dev->dev,
367						  &tosa_bat_main_desc,
368						  &main_psy_cfg);
369	if (IS_ERR(tosa_bat_main.psy)) {
370		ret = PTR_ERR(tosa_bat_main.psy);
371		goto err_psy_reg_main;
372	}
373
374	jacket_psy_cfg.drv_data = &tosa_bat_jacket;
375	tosa_bat_jacket.psy = power_supply_register(&dev->dev,
376						    &tosa_bat_jacket_desc,
377						    &jacket_psy_cfg);
378	if (IS_ERR(tosa_bat_jacket.psy)) {
379		ret = PTR_ERR(tosa_bat_jacket.psy);
380		goto err_psy_reg_jacket;
381	}
382
383	bu_psy_cfg.drv_data = &tosa_bat_bu;
384	tosa_bat_bu.psy = power_supply_register(&dev->dev, &tosa_bat_bu_desc,
385						&bu_psy_cfg);
386	if (IS_ERR(tosa_bat_bu.psy)) {
387		ret = PTR_ERR(tosa_bat_bu.psy);
388		goto err_psy_reg_bu;
389	}
390
391	ret = request_irq(gpio_to_irq(TOSA_GPIO_BAT0_CRG),
392				tosa_bat_gpio_isr,
393				IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
394				"main full", &tosa_bat_main);
395	if (ret)
396		goto err_req_main;
397
398	ret = request_irq(gpio_to_irq(TOSA_GPIO_BAT1_CRG),
399				tosa_bat_gpio_isr,
400				IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
401				"jacket full", &tosa_bat_jacket);
402	if (ret)
403		goto err_req_jacket;
404
405	ret = request_irq(gpio_to_irq(TOSA_GPIO_JACKET_DETECT),
406				tosa_bat_gpio_isr,
407				IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
408				"jacket detect", &tosa_bat_jacket);
409	if (!ret) {
410		schedule_work(&bat_work);
411		return 0;
412	}
413
414	free_irq(gpio_to_irq(TOSA_GPIO_BAT1_CRG), &tosa_bat_jacket);
415err_req_jacket:
416	free_irq(gpio_to_irq(TOSA_GPIO_BAT0_CRG), &tosa_bat_main);
417err_req_main:
418	power_supply_unregister(tosa_bat_bu.psy);
419err_psy_reg_bu:
420	power_supply_unregister(tosa_bat_jacket.psy);
421err_psy_reg_jacket:
422	power_supply_unregister(tosa_bat_main.psy);
423err_psy_reg_main:
424
425	/* see comment in tosa_bat_remove */
426	cancel_work_sync(&bat_work);
427
428	gpio_free_array(tosa_bat_gpios, ARRAY_SIZE(tosa_bat_gpios));
429	return ret;
430}
431
432static int tosa_bat_remove(struct platform_device *dev)
433{
434	free_irq(gpio_to_irq(TOSA_GPIO_JACKET_DETECT), &tosa_bat_jacket);
435	free_irq(gpio_to_irq(TOSA_GPIO_BAT1_CRG), &tosa_bat_jacket);
436	free_irq(gpio_to_irq(TOSA_GPIO_BAT0_CRG), &tosa_bat_main);
437
438	power_supply_unregister(tosa_bat_bu.psy);
439	power_supply_unregister(tosa_bat_jacket.psy);
440	power_supply_unregister(tosa_bat_main.psy);
441
442	/*
443	 * Now cancel the bat_work.  We won't get any more schedules,
444	 * since all sources (isr and external_power_changed) are
445	 * unregistered now.
446	 */
447	cancel_work_sync(&bat_work);
448	gpio_free_array(tosa_bat_gpios, ARRAY_SIZE(tosa_bat_gpios));
449	return 0;
450}
451
452static struct platform_driver tosa_bat_driver = {
453	.driver.name	= "wm97xx-battery",
454	.driver.owner	= THIS_MODULE,
455	.probe		= tosa_bat_probe,
456	.remove		= tosa_bat_remove,
457	.suspend	= tosa_bat_suspend,
458	.resume		= tosa_bat_resume,
459};
460
461module_platform_driver(tosa_bat_driver);
462
463MODULE_LICENSE("GPL");
464MODULE_AUTHOR("Dmitry Baryshkov");
465MODULE_DESCRIPTION("Tosa battery driver");
466MODULE_ALIAS("platform:wm97xx-battery");
467