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 
24 static DEFINE_MUTEX(bat_lock); /* protects gpio pins */
25 static struct work_struct bat_work;
26 static struct ucb1x00 *ucb;
27 
28 struct 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 
52 static struct collie_bat collie_bat_main;
53 
54 static 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 
73 static 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 
93 static 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 
140 static void collie_bat_external_power_changed(struct power_supply *psy)
141 {
142 	schedule_work(&bat_work);
143 }
144 
145 static 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 
152 static 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 
193 static void collie_bat_work(struct work_struct *work)
194 {
195 	collie_bat_update(&collie_bat_main);
196 }
197 
198 
199 static 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 
210 static 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 
220 static 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 
230 static 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 
251 static 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 
260 static 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 */
282 static struct gpio_desc *collie_mbat_low;
283 
284 #ifdef CONFIG_PM
285 static int wakeup_enabled;
286 
287 static 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 
301 static 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 
315 static 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 
419 err_irq:
420 	power_supply_unregister(collie_bat_bu.psy);
421 err_psy_reg_bu:
422 	power_supply_unregister(collie_bat_main.psy);
423 err_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);
427 err_free_gpio_temp:
428 	gpiochip_free_own_desc(collie_bat_main.gpio_temp);
429 err_free_gpio_bat:
430 	gpiochip_free_own_desc(collie_bat_main.gpio_bat);
431 err_put_gpio_charge_on:
432 	gpiod_put(collie_bat_main.gpio_charge_on);
433 err_put_mbat_low:
434 	gpiod_put(collie_mbat_low);
435 err_put_gpio_full:
436 	gpiod_put(collie_bat_main.gpio_full);
437 
438 	return ret;
439 }
440 
441 static 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 
463 static 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 
470 static int __init collie_bat_init(void)
471 {
472 	return ucb1x00_register_driver(&collie_bat_driver);
473 }
474 
475 static void __exit collie_bat_exit(void)
476 {
477 	ucb1x00_unregister_driver(&collie_bat_driver);
478 }
479 
480 module_init(collie_bat_init);
481 module_exit(collie_bat_exit);
482 
483 MODULE_LICENSE("GPL");
484 MODULE_AUTHOR("Thomas Kunze");
485 MODULE_DESCRIPTION("Collie battery driver");
486