1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Battery and Power Management code for the Sharp SL-5x00
4 *
5 * Copyright (C) 2009 Thomas Kunze
6 *
7 * based on tosa_battery.c
8 */
9#include <linux/kernel.h>
10#include <linux/module.h>
11#include <linux/power_supply.h>
12#include <linux/delay.h>
13#include <linux/spinlock.h>
14#include <linux/interrupt.h>
15#include <linux/gpio.h>
16#include <linux/mfd/ucb1x00.h>
17
18#include <asm/mach/sharpsl_param.h>
19#include <asm/mach-types.h>
20#include <mach/collie.h>
21
22static DEFINE_MUTEX(bat_lock); /* protects gpio pins */
23static struct work_struct bat_work;
24static struct ucb1x00 *ucb;
25
26struct collie_bat {
27	int status;
28	struct power_supply *psy;
29	int full_chrg;
30
31	struct mutex work_lock; /* protects data */
32
33	bool (*is_present)(struct collie_bat *bat);
34	int gpio_full;
35	int gpio_charge_on;
36
37	int technology;
38
39	int gpio_bat;
40	int adc_bat;
41	int adc_bat_divider;
42	int bat_max;
43	int bat_min;
44
45	int gpio_temp;
46	int adc_temp;
47	int adc_temp_divider;
48};
49
50static struct collie_bat collie_bat_main;
51
52static unsigned long collie_read_bat(struct collie_bat *bat)
53{
54	unsigned long value = 0;
55
56	if (bat->gpio_bat < 0 || bat->adc_bat < 0)
57		return 0;
58	mutex_lock(&bat_lock);
59	gpio_set_value(bat->gpio_bat, 1);
60	msleep(5);
61	ucb1x00_adc_enable(ucb);
62	value = ucb1x00_adc_read(ucb, bat->adc_bat, UCB_SYNC);
63	ucb1x00_adc_disable(ucb);
64	gpio_set_value(bat->gpio_bat, 0);
65	mutex_unlock(&bat_lock);
66	value = value * 1000000 / bat->adc_bat_divider;
67
68	return value;
69}
70
71static unsigned long collie_read_temp(struct collie_bat *bat)
72{
73	unsigned long value = 0;
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	ucb1x00_adc_enable(ucb);
81	value = ucb1x00_adc_read(ucb, bat->adc_temp, UCB_SYNC);
82	ucb1x00_adc_disable(ucb);
83	gpio_set_value(bat->gpio_temp, 0);
84	mutex_unlock(&bat_lock);
85
86	value = value * 10000 / bat->adc_temp_divider;
87
88	return value;
89}
90
91static int collie_bat_get_property(struct power_supply *psy,
92			    enum power_supply_property psp,
93			    union power_supply_propval *val)
94{
95	int ret = 0;
96	struct collie_bat *bat = power_supply_get_drvdata(psy);
97
98	if (bat->is_present && !bat->is_present(bat)
99			&& psp != POWER_SUPPLY_PROP_PRESENT) {
100		return -ENODEV;
101	}
102
103	switch (psp) {
104	case POWER_SUPPLY_PROP_STATUS:
105		val->intval = bat->status;
106		break;
107	case POWER_SUPPLY_PROP_TECHNOLOGY:
108		val->intval = bat->technology;
109		break;
110	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
111		val->intval = collie_read_bat(bat);
112		break;
113	case POWER_SUPPLY_PROP_VOLTAGE_MAX:
114		if (bat->full_chrg == -1)
115			val->intval = bat->bat_max;
116		else
117			val->intval = bat->full_chrg;
118		break;
119	case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
120		val->intval = bat->bat_max;
121		break;
122	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
123		val->intval = bat->bat_min;
124		break;
125	case POWER_SUPPLY_PROP_TEMP:
126		val->intval = collie_read_temp(bat);
127		break;
128	case POWER_SUPPLY_PROP_PRESENT:
129		val->intval = bat->is_present ? bat->is_present(bat) : 1;
130		break;
131	default:
132		ret = -EINVAL;
133		break;
134	}
135	return ret;
136}
137
138static void collie_bat_external_power_changed(struct power_supply *psy)
139{
140	schedule_work(&bat_work);
141}
142
143static irqreturn_t collie_bat_gpio_isr(int irq, void *data)
144{
145	pr_info("collie_bat_gpio irq\n");
146	schedule_work(&bat_work);
147	return IRQ_HANDLED;
148}
149
150static void collie_bat_update(struct collie_bat *bat)
151{
152	int old;
153	struct power_supply *psy = bat->psy;
154
155	mutex_lock(&bat->work_lock);
156
157	old = bat->status;
158
159	if (bat->is_present && !bat->is_present(bat)) {
160		printk(KERN_NOTICE "%s not present\n", psy->desc->name);
161		bat->status = POWER_SUPPLY_STATUS_UNKNOWN;
162		bat->full_chrg = -1;
163	} else if (power_supply_am_i_supplied(psy)) {
164		if (bat->status == POWER_SUPPLY_STATUS_DISCHARGING) {
165			gpio_set_value(bat->gpio_charge_on, 1);
166			mdelay(15);
167		}
168
169		if (gpio_get_value(bat->gpio_full)) {
170			if (old == POWER_SUPPLY_STATUS_CHARGING ||
171					bat->full_chrg == -1)
172				bat->full_chrg = collie_read_bat(bat);
173
174			gpio_set_value(bat->gpio_charge_on, 0);
175			bat->status = POWER_SUPPLY_STATUS_FULL;
176		} else {
177			gpio_set_value(bat->gpio_charge_on, 1);
178			bat->status = POWER_SUPPLY_STATUS_CHARGING;
179		}
180	} else {
181		gpio_set_value(bat->gpio_charge_on, 0);
182		bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
183	}
184
185	if (old != bat->status)
186		power_supply_changed(psy);
187
188	mutex_unlock(&bat->work_lock);
189}
190
191static void collie_bat_work(struct work_struct *work)
192{
193	collie_bat_update(&collie_bat_main);
194}
195
196
197static enum power_supply_property collie_bat_main_props[] = {
198	POWER_SUPPLY_PROP_STATUS,
199	POWER_SUPPLY_PROP_TECHNOLOGY,
200	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
201	POWER_SUPPLY_PROP_VOLTAGE_NOW,
202	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
203	POWER_SUPPLY_PROP_VOLTAGE_MAX,
204	POWER_SUPPLY_PROP_PRESENT,
205	POWER_SUPPLY_PROP_TEMP,
206};
207
208static enum power_supply_property collie_bat_bu_props[] = {
209	POWER_SUPPLY_PROP_STATUS,
210	POWER_SUPPLY_PROP_TECHNOLOGY,
211	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
212	POWER_SUPPLY_PROP_VOLTAGE_NOW,
213	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
214	POWER_SUPPLY_PROP_VOLTAGE_MAX,
215	POWER_SUPPLY_PROP_PRESENT,
216};
217
218static const struct power_supply_desc collie_bat_main_desc = {
219	.name		= "main-battery",
220	.type		= POWER_SUPPLY_TYPE_BATTERY,
221	.properties	= collie_bat_main_props,
222	.num_properties	= ARRAY_SIZE(collie_bat_main_props),
223	.get_property	= collie_bat_get_property,
224	.external_power_changed = collie_bat_external_power_changed,
225	.use_for_apm	= 1,
226};
227
228static struct collie_bat collie_bat_main = {
229	.status = POWER_SUPPLY_STATUS_DISCHARGING,
230	.full_chrg = -1,
231	.psy = NULL,
232
233	.gpio_full = COLLIE_GPIO_CO,
234	.gpio_charge_on = COLLIE_GPIO_CHARGE_ON,
235
236	.technology = POWER_SUPPLY_TECHNOLOGY_LIPO,
237
238	.gpio_bat = COLLIE_GPIO_MBAT_ON,
239	.adc_bat = UCB_ADC_INP_AD1,
240	.adc_bat_divider = 155,
241	.bat_max = 4310000,
242	.bat_min = 1551 * 1000000 / 414,
243
244	.gpio_temp = COLLIE_GPIO_TMP_ON,
245	.adc_temp = UCB_ADC_INP_AD0,
246	.adc_temp_divider = 10000,
247};
248
249static const struct power_supply_desc collie_bat_bu_desc = {
250	.name		= "backup-battery",
251	.type		= POWER_SUPPLY_TYPE_BATTERY,
252	.properties	= collie_bat_bu_props,
253	.num_properties	= ARRAY_SIZE(collie_bat_bu_props),
254	.get_property	= collie_bat_get_property,
255	.external_power_changed = collie_bat_external_power_changed,
256};
257
258static struct collie_bat collie_bat_bu = {
259	.status = POWER_SUPPLY_STATUS_UNKNOWN,
260	.full_chrg = -1,
261	.psy = NULL,
262
263	.gpio_full = -1,
264	.gpio_charge_on = -1,
265
266	.technology = POWER_SUPPLY_TECHNOLOGY_LiMn,
267
268	.gpio_bat = COLLIE_GPIO_BBAT_ON,
269	.adc_bat = UCB_ADC_INP_AD1,
270	.adc_bat_divider = 155,
271	.bat_max = 3000000,
272	.bat_min = 1900000,
273
274	.gpio_temp = -1,
275	.adc_temp = -1,
276	.adc_temp_divider = -1,
277};
278
279static struct gpio collie_batt_gpios[] = {
280	{ COLLIE_GPIO_CO,	    GPIOF_IN,		"main battery full" },
281	{ COLLIE_GPIO_MAIN_BAT_LOW, GPIOF_IN,		"main battery low" },
282	{ COLLIE_GPIO_CHARGE_ON,    GPIOF_OUT_INIT_LOW,	"main charge on" },
283	{ COLLIE_GPIO_MBAT_ON,	    GPIOF_OUT_INIT_LOW,	"main battery" },
284	{ COLLIE_GPIO_TMP_ON,	    GPIOF_OUT_INIT_LOW,	"main battery temp" },
285	{ COLLIE_GPIO_BBAT_ON,	    GPIOF_OUT_INIT_LOW,	"backup battery" },
286};
287
288#ifdef CONFIG_PM
289static int wakeup_enabled;
290
291static int collie_bat_suspend(struct ucb1x00_dev *dev)
292{
293	/* flush all pending status updates */
294	flush_work(&bat_work);
295
296	if (device_may_wakeup(&dev->ucb->dev) &&
297	    collie_bat_main.status == POWER_SUPPLY_STATUS_CHARGING)
298		wakeup_enabled = !enable_irq_wake(gpio_to_irq(COLLIE_GPIO_CO));
299	else
300		wakeup_enabled = 0;
301
302	return 0;
303}
304
305static int collie_bat_resume(struct ucb1x00_dev *dev)
306{
307	if (wakeup_enabled)
308		disable_irq_wake(gpio_to_irq(COLLIE_GPIO_CO));
309
310	/* things may have changed while we were away */
311	schedule_work(&bat_work);
312	return 0;
313}
314#else
315#define collie_bat_suspend NULL
316#define collie_bat_resume NULL
317#endif
318
319static int collie_bat_probe(struct ucb1x00_dev *dev)
320{
321	int ret;
322	struct power_supply_config psy_main_cfg = {}, psy_bu_cfg = {};
323
324	if (!machine_is_collie())
325		return -ENODEV;
326
327	ucb = dev->ucb;
328
329	ret = gpio_request_array(collie_batt_gpios,
330				 ARRAY_SIZE(collie_batt_gpios));
331	if (ret)
332		return ret;
333
334	mutex_init(&collie_bat_main.work_lock);
335
336	INIT_WORK(&bat_work, collie_bat_work);
337
338	psy_main_cfg.drv_data = &collie_bat_main;
339	collie_bat_main.psy = power_supply_register(&dev->ucb->dev,
340						    &collie_bat_main_desc,
341						    &psy_main_cfg);
342	if (IS_ERR(collie_bat_main.psy)) {
343		ret = PTR_ERR(collie_bat_main.psy);
344		goto err_psy_reg_main;
345	}
346
347	psy_bu_cfg.drv_data = &collie_bat_bu;
348	collie_bat_bu.psy = power_supply_register(&dev->ucb->dev,
349						  &collie_bat_bu_desc,
350						  &psy_bu_cfg);
351	if (IS_ERR(collie_bat_bu.psy)) {
352		ret = PTR_ERR(collie_bat_bu.psy);
353		goto err_psy_reg_bu;
354	}
355
356	ret = request_irq(gpio_to_irq(COLLIE_GPIO_CO),
357				collie_bat_gpio_isr,
358				IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
359				"main full", &collie_bat_main);
360	if (ret)
361		goto err_irq;
362
363	device_init_wakeup(&ucb->dev, 1);
364	schedule_work(&bat_work);
365
366	return 0;
367
368err_irq:
369	power_supply_unregister(collie_bat_bu.psy);
370err_psy_reg_bu:
371	power_supply_unregister(collie_bat_main.psy);
372err_psy_reg_main:
373
374	/* see comment in collie_bat_remove */
375	cancel_work_sync(&bat_work);
376	gpio_free_array(collie_batt_gpios, ARRAY_SIZE(collie_batt_gpios));
377	return ret;
378}
379
380static void collie_bat_remove(struct ucb1x00_dev *dev)
381{
382	free_irq(gpio_to_irq(COLLIE_GPIO_CO), &collie_bat_main);
383
384	power_supply_unregister(collie_bat_bu.psy);
385	power_supply_unregister(collie_bat_main.psy);
386
387	/*
388	 * Now cancel the bat_work.  We won't get any more schedules,
389	 * since all sources (isr and external_power_changed) are
390	 * unregistered now.
391	 */
392	cancel_work_sync(&bat_work);
393	gpio_free_array(collie_batt_gpios, ARRAY_SIZE(collie_batt_gpios));
394}
395
396static struct ucb1x00_driver collie_bat_driver = {
397	.add		= collie_bat_probe,
398	.remove		= collie_bat_remove,
399	.suspend	= collie_bat_suspend,
400	.resume		= collie_bat_resume,
401};
402
403static int __init collie_bat_init(void)
404{
405	return ucb1x00_register_driver(&collie_bat_driver);
406}
407
408static void __exit collie_bat_exit(void)
409{
410	ucb1x00_unregister_driver(&collie_bat_driver);
411}
412
413module_init(collie_bat_init);
414module_exit(collie_bat_exit);
415
416MODULE_LICENSE("GPL");
417MODULE_AUTHOR("Thomas Kunze");
418MODULE_DESCRIPTION("Collie battery driver");
419