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 
22 static DEFINE_MUTEX(bat_lock); /* protects gpio pins */
23 static struct work_struct bat_work;
24 static struct ucb1x00 *ucb;
25 
26 struct 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 
50 static struct collie_bat collie_bat_main;
51 
52 static 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 
71 static 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 
91 static 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 
138 static void collie_bat_external_power_changed(struct power_supply *psy)
139 {
140 	schedule_work(&bat_work);
141 }
142 
143 static 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 
150 static 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 
191 static void collie_bat_work(struct work_struct *work)
192 {
193 	collie_bat_update(&collie_bat_main);
194 }
195 
196 
197 static 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 
208 static 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 
218 static 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 
228 static 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 
249 static 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 
258 static 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 
279 static 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
289 static int wakeup_enabled;
290 
291 static 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 
305 static 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 
319 static 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 
368 err_irq:
369 	power_supply_unregister(collie_bat_bu.psy);
370 err_psy_reg_bu:
371 	power_supply_unregister(collie_bat_main.psy);
372 err_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 
380 static 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 
396 static 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 
403 static int __init collie_bat_init(void)
404 {
405 	return ucb1x00_register_driver(&collie_bat_driver);
406 }
407 
408 static void __exit collie_bat_exit(void)
409 {
410 	ucb1x00_unregister_driver(&collie_bat_driver);
411 }
412 
413 module_init(collie_bat_init);
414 module_exit(collie_bat_exit);
415 
416 MODULE_LICENSE("GPL");
417 MODULE_AUTHOR("Thomas Kunze");
418 MODULE_DESCRIPTION("Collie battery driver");
419