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/driver.h>
16#include <linux/gpio/machine.h>
17#include <linux/gpio/consumer.h>
18#include <linux/mfd/ucb1x00.h>
19
20#include <asm/mach/sharpsl_param.h>
21#include <asm/mach-types.h>
22#include <mach/collie.h>
23
24static DEFINE_MUTEX(bat_lock); /* protects gpio pins */
25static struct work_struct bat_work;
26static struct ucb1x00 *ucb;
27
28struct collie_bat {
29	int status;
30	struct power_supply *psy;
31	int full_chrg;
32
33	struct mutex work_lock; /* protects data */
34
35	bool (*is_present)(struct collie_bat *bat);
36	struct gpio_desc *gpio_full;
37	struct gpio_desc *gpio_charge_on;
38
39	int technology;
40
41	struct gpio_desc *gpio_bat;
42	int adc_bat;
43	int adc_bat_divider;
44	int bat_max;
45	int bat_min;
46
47	struct gpio_desc *gpio_temp;
48	int adc_temp;
49	int adc_temp_divider;
50};
51
52static struct collie_bat collie_bat_main;
53
54static unsigned long collie_read_bat(struct collie_bat *bat)
55{
56	unsigned long value = 0;
57
58	if (!bat->gpio_bat || bat->adc_bat < 0)
59		return 0;
60	mutex_lock(&bat_lock);
61	gpiod_set_value(bat->gpio_bat, 1);
62	msleep(5);
63	ucb1x00_adc_enable(ucb);
64	value = ucb1x00_adc_read(ucb, bat->adc_bat, UCB_SYNC);
65	ucb1x00_adc_disable(ucb);
66	gpiod_set_value(bat->gpio_bat, 0);
67	mutex_unlock(&bat_lock);
68	value = value * 1000000 / bat->adc_bat_divider;
69
70	return value;
71}
72
73static unsigned long collie_read_temp(struct collie_bat *bat)
74{
75	unsigned long value = 0;
76	if (!bat->gpio_temp || bat->adc_temp < 0)
77		return 0;
78
79	mutex_lock(&bat_lock);
80	gpiod_set_value(bat->gpio_temp, 1);
81	msleep(5);
82	ucb1x00_adc_enable(ucb);
83	value = ucb1x00_adc_read(ucb, bat->adc_temp, UCB_SYNC);
84	ucb1x00_adc_disable(ucb);
85	gpiod_set_value(bat->gpio_temp, 0);
86	mutex_unlock(&bat_lock);
87
88	value = value * 10000 / bat->adc_temp_divider;
89
90	return value;
91}
92
93static int collie_bat_get_property(struct power_supply *psy,
94			    enum power_supply_property psp,
95			    union power_supply_propval *val)
96{
97	int ret = 0;
98	struct collie_bat *bat = power_supply_get_drvdata(psy);
99
100	if (bat->is_present && !bat->is_present(bat)
101			&& psp != POWER_SUPPLY_PROP_PRESENT) {
102		return -ENODEV;
103	}
104
105	switch (psp) {
106	case POWER_SUPPLY_PROP_STATUS:
107		val->intval = bat->status;
108		break;
109	case POWER_SUPPLY_PROP_TECHNOLOGY:
110		val->intval = bat->technology;
111		break;
112	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
113		val->intval = collie_read_bat(bat);
114		break;
115	case POWER_SUPPLY_PROP_VOLTAGE_MAX:
116		if (bat->full_chrg == -1)
117			val->intval = bat->bat_max;
118		else
119			val->intval = bat->full_chrg;
120		break;
121	case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
122		val->intval = bat->bat_max;
123		break;
124	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
125		val->intval = bat->bat_min;
126		break;
127	case POWER_SUPPLY_PROP_TEMP:
128		val->intval = collie_read_temp(bat);
129		break;
130	case POWER_SUPPLY_PROP_PRESENT:
131		val->intval = bat->is_present ? bat->is_present(bat) : 1;
132		break;
133	default:
134		ret = -EINVAL;
135		break;
136	}
137	return ret;
138}
139
140static void collie_bat_external_power_changed(struct power_supply *psy)
141{
142	schedule_work(&bat_work);
143}
144
145static irqreturn_t collie_bat_gpio_isr(int irq, void *data)
146{
147	pr_info("collie_bat_gpio irq\n");
148	schedule_work(&bat_work);
149	return IRQ_HANDLED;
150}
151
152static void collie_bat_update(struct collie_bat *bat)
153{
154	int old;
155	struct power_supply *psy = bat->psy;
156
157	mutex_lock(&bat->work_lock);
158
159	old = bat->status;
160
161	if (bat->is_present && !bat->is_present(bat)) {
162		printk(KERN_NOTICE "%s not present\n", psy->desc->name);
163		bat->status = POWER_SUPPLY_STATUS_UNKNOWN;
164		bat->full_chrg = -1;
165	} else if (power_supply_am_i_supplied(psy)) {
166		if (bat->status == POWER_SUPPLY_STATUS_DISCHARGING) {
167			gpiod_set_value(bat->gpio_charge_on, 1);
168			mdelay(15);
169		}
170
171		if (gpiod_get_value(bat->gpio_full)) {
172			if (old == POWER_SUPPLY_STATUS_CHARGING ||
173					bat->full_chrg == -1)
174				bat->full_chrg = collie_read_bat(bat);
175
176			gpiod_set_value(bat->gpio_charge_on, 0);
177			bat->status = POWER_SUPPLY_STATUS_FULL;
178		} else {
179			gpiod_set_value(bat->gpio_charge_on, 1);
180			bat->status = POWER_SUPPLY_STATUS_CHARGING;
181		}
182	} else {
183		gpiod_set_value(bat->gpio_charge_on, 0);
184		bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
185	}
186
187	if (old != bat->status)
188		power_supply_changed(psy);
189
190	mutex_unlock(&bat->work_lock);
191}
192
193static void collie_bat_work(struct work_struct *work)
194{
195	collie_bat_update(&collie_bat_main);
196}
197
198
199static enum power_supply_property collie_bat_main_props[] = {
200	POWER_SUPPLY_PROP_STATUS,
201	POWER_SUPPLY_PROP_TECHNOLOGY,
202	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
203	POWER_SUPPLY_PROP_VOLTAGE_NOW,
204	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
205	POWER_SUPPLY_PROP_VOLTAGE_MAX,
206	POWER_SUPPLY_PROP_PRESENT,
207	POWER_SUPPLY_PROP_TEMP,
208};
209
210static enum power_supply_property collie_bat_bu_props[] = {
211	POWER_SUPPLY_PROP_STATUS,
212	POWER_SUPPLY_PROP_TECHNOLOGY,
213	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
214	POWER_SUPPLY_PROP_VOLTAGE_NOW,
215	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
216	POWER_SUPPLY_PROP_VOLTAGE_MAX,
217	POWER_SUPPLY_PROP_PRESENT,
218};
219
220static const struct power_supply_desc collie_bat_main_desc = {
221	.name		= "main-battery",
222	.type		= POWER_SUPPLY_TYPE_BATTERY,
223	.properties	= collie_bat_main_props,
224	.num_properties	= ARRAY_SIZE(collie_bat_main_props),
225	.get_property	= collie_bat_get_property,
226	.external_power_changed = collie_bat_external_power_changed,
227	.use_for_apm	= 1,
228};
229
230static struct collie_bat collie_bat_main = {
231	.status = POWER_SUPPLY_STATUS_DISCHARGING,
232	.full_chrg = -1,
233	.psy = NULL,
234
235	.gpio_full = NULL,
236	.gpio_charge_on = NULL,
237
238	.technology = POWER_SUPPLY_TECHNOLOGY_LIPO,
239
240	.gpio_bat = NULL,
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 = NULL,
247	.adc_temp = UCB_ADC_INP_AD0,
248	.adc_temp_divider = 10000,
249};
250
251static const struct power_supply_desc collie_bat_bu_desc = {
252	.name		= "backup-battery",
253	.type		= POWER_SUPPLY_TYPE_BATTERY,
254	.properties	= collie_bat_bu_props,
255	.num_properties	= ARRAY_SIZE(collie_bat_bu_props),
256	.get_property	= collie_bat_get_property,
257	.external_power_changed = collie_bat_external_power_changed,
258};
259
260static struct collie_bat collie_bat_bu = {
261	.status = POWER_SUPPLY_STATUS_UNKNOWN,
262	.full_chrg = -1,
263	.psy = NULL,
264
265	.gpio_full = NULL,
266	.gpio_charge_on = NULL,
267
268	.technology = POWER_SUPPLY_TECHNOLOGY_LiMn,
269
270	.gpio_bat = NULL,
271	.adc_bat = UCB_ADC_INP_AD1,
272	.adc_bat_divider = 155,
273	.bat_max = 3000000,
274	.bat_min = 1900000,
275
276	.gpio_temp = NULL,
277	.adc_temp = -1,
278	.adc_temp_divider = -1,
279};
280
281/* Obtained but unused GPIO */
282static struct gpio_desc *collie_mbat_low;
283
284#ifdef CONFIG_PM
285static int wakeup_enabled;
286
287static int collie_bat_suspend(struct ucb1x00_dev *dev)
288{
289	/* flush all pending status updates */
290	flush_work(&bat_work);
291
292	if (device_may_wakeup(&dev->ucb->dev) &&
293	    collie_bat_main.status == POWER_SUPPLY_STATUS_CHARGING)
294		wakeup_enabled = !enable_irq_wake(gpiod_to_irq(collie_bat_main.gpio_full));
295	else
296		wakeup_enabled = 0;
297
298	return 0;
299}
300
301static int collie_bat_resume(struct ucb1x00_dev *dev)
302{
303	if (wakeup_enabled)
304		disable_irq_wake(gpiod_to_irq(collie_bat_main.gpio_full));
305
306	/* things may have changed while we were away */
307	schedule_work(&bat_work);
308	return 0;
309}
310#else
311#define collie_bat_suspend NULL
312#define collie_bat_resume NULL
313#endif
314
315static int collie_bat_probe(struct ucb1x00_dev *dev)
316{
317	int ret;
318	struct power_supply_config psy_main_cfg = {}, psy_bu_cfg = {};
319	struct gpio_chip *gc = &dev->ucb->gpio;
320
321	if (!machine_is_collie())
322		return -ENODEV;
323
324	ucb = dev->ucb;
325
326	/* Obtain all the main battery GPIOs */
327	collie_bat_main.gpio_full = gpiod_get(&dev->ucb->dev,
328					      "main battery full",
329					      GPIOD_IN);
330	if (IS_ERR(collie_bat_main.gpio_full))
331		return PTR_ERR(collie_bat_main.gpio_full);
332
333	collie_mbat_low = gpiod_get(&dev->ucb->dev,
334				    "main battery low",
335				    GPIOD_IN);
336	if (IS_ERR(collie_mbat_low)) {
337		ret = PTR_ERR(collie_mbat_low);
338		goto err_put_gpio_full;
339	}
340
341	collie_bat_main.gpio_charge_on = gpiod_get(&dev->ucb->dev,
342						   "main charge on",
343						   GPIOD_OUT_LOW);
344	if (IS_ERR(collie_bat_main.gpio_charge_on)) {
345		ret = PTR_ERR(collie_bat_main.gpio_charge_on);
346		goto err_put_mbat_low;
347	}
348
349	/* COLLIE_GPIO_MBAT_ON = GPIO 7 on the UCB (TC35143) */
350	collie_bat_main.gpio_bat = gpiochip_request_own_desc(gc,
351						7,
352						"main battery",
353						GPIO_ACTIVE_HIGH,
354						GPIOD_OUT_LOW);
355	if (IS_ERR(collie_bat_main.gpio_bat)) {
356		ret = PTR_ERR(collie_bat_main.gpio_bat);
357		goto err_put_gpio_charge_on;
358	}
359
360	/* COLLIE_GPIO_TMP_ON = GPIO 9 on the UCB (TC35143) */
361	collie_bat_main.gpio_temp = gpiochip_request_own_desc(gc,
362						9,
363						"main battery temp",
364						GPIO_ACTIVE_HIGH,
365						GPIOD_OUT_LOW);
366	if (IS_ERR(collie_bat_main.gpio_temp)) {
367		ret = PTR_ERR(collie_bat_main.gpio_temp);
368		goto err_free_gpio_bat;
369	}
370
371	/*
372	 * Obtain the backup battery COLLIE_GPIO_BBAT_ON which is
373	 * GPIO 8 on the UCB (TC35143)
374	 */
375	collie_bat_bu.gpio_bat = gpiochip_request_own_desc(gc,
376						8,
377						"backup battery",
378						GPIO_ACTIVE_HIGH,
379						GPIOD_OUT_LOW);
380	if (IS_ERR(collie_bat_bu.gpio_bat)) {
381		ret = PTR_ERR(collie_bat_bu.gpio_bat);
382		goto err_free_gpio_temp;
383	}
384
385	mutex_init(&collie_bat_main.work_lock);
386
387	INIT_WORK(&bat_work, collie_bat_work);
388
389	psy_main_cfg.drv_data = &collie_bat_main;
390	collie_bat_main.psy = power_supply_register(&dev->ucb->dev,
391						    &collie_bat_main_desc,
392						    &psy_main_cfg);
393	if (IS_ERR(collie_bat_main.psy)) {
394		ret = PTR_ERR(collie_bat_main.psy);
395		goto err_psy_reg_main;
396	}
397
398	psy_bu_cfg.drv_data = &collie_bat_bu;
399	collie_bat_bu.psy = power_supply_register(&dev->ucb->dev,
400						  &collie_bat_bu_desc,
401						  &psy_bu_cfg);
402	if (IS_ERR(collie_bat_bu.psy)) {
403		ret = PTR_ERR(collie_bat_bu.psy);
404		goto err_psy_reg_bu;
405	}
406
407	ret = request_irq(gpiod_to_irq(collie_bat_main.gpio_full),
408				collie_bat_gpio_isr,
409				IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
410				"main full", &collie_bat_main);
411	if (ret)
412		goto err_irq;
413
414	device_init_wakeup(&ucb->dev, 1);
415	schedule_work(&bat_work);
416
417	return 0;
418
419err_irq:
420	power_supply_unregister(collie_bat_bu.psy);
421err_psy_reg_bu:
422	power_supply_unregister(collie_bat_main.psy);
423err_psy_reg_main:
424	/* see comment in collie_bat_remove */
425	cancel_work_sync(&bat_work);
426	gpiochip_free_own_desc(collie_bat_bu.gpio_bat);
427err_free_gpio_temp:
428	gpiochip_free_own_desc(collie_bat_main.gpio_temp);
429err_free_gpio_bat:
430	gpiochip_free_own_desc(collie_bat_main.gpio_bat);
431err_put_gpio_charge_on:
432	gpiod_put(collie_bat_main.gpio_charge_on);
433err_put_mbat_low:
434	gpiod_put(collie_mbat_low);
435err_put_gpio_full:
436	gpiod_put(collie_bat_main.gpio_full);
437
438	return ret;
439}
440
441static void collie_bat_remove(struct ucb1x00_dev *dev)
442{
443	free_irq(gpiod_to_irq(collie_bat_main.gpio_full), &collie_bat_main);
444	power_supply_unregister(collie_bat_bu.psy);
445	power_supply_unregister(collie_bat_main.psy);
446
447	/* These are obtained from the machine */
448	gpiod_put(collie_bat_main.gpio_full);
449	gpiod_put(collie_mbat_low);
450	gpiod_put(collie_bat_main.gpio_charge_on);
451	/* These are directly from the UCB so let's free them */
452	gpiochip_free_own_desc(collie_bat_main.gpio_bat);
453	gpiochip_free_own_desc(collie_bat_main.gpio_temp);
454	gpiochip_free_own_desc(collie_bat_bu.gpio_bat);
455	/*
456	 * Now cancel the bat_work.  We won't get any more schedules,
457	 * since all sources (isr and external_power_changed) are
458	 * unregistered now.
459	 */
460	cancel_work_sync(&bat_work);
461}
462
463static struct ucb1x00_driver collie_bat_driver = {
464	.add		= collie_bat_probe,
465	.remove		= collie_bat_remove,
466	.suspend	= collie_bat_suspend,
467	.resume		= collie_bat_resume,
468};
469
470static int __init collie_bat_init(void)
471{
472	return ucb1x00_register_driver(&collie_bat_driver);
473}
474
475static void __exit collie_bat_exit(void)
476{
477	ucb1x00_unregister_driver(&collie_bat_driver);
478}
479
480module_init(collie_bat_init);
481module_exit(collie_bat_exit);
482
483MODULE_LICENSE("GPL");
484MODULE_AUTHOR("Thomas Kunze");
485MODULE_DESCRIPTION("Collie battery driver");
486