1 /*
2  * Battery and Power Management code for the Sharp SL-5x00
3  *
4  * Copyright (C) 2009 Thomas Kunze
5  *
6  * based on tosa_battery.c
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License version 2 as
10  * published by the Free Software Foundation.
11  *
12  */
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/power_supply.h>
16 #include <linux/delay.h>
17 #include <linux/spinlock.h>
18 #include <linux/interrupt.h>
19 #include <linux/gpio.h>
20 #include <linux/mfd/ucb1x00.h>
21 
22 #include <asm/mach/sharpsl_param.h>
23 #include <asm/mach-types.h>
24 #include <mach/collie.h>
25 
26 static DEFINE_MUTEX(bat_lock); /* protects gpio pins */
27 static struct work_struct bat_work;
28 static struct ucb1x00 *ucb;
29 
30 struct collie_bat {
31 	int status;
32 	struct power_supply *psy;
33 	int full_chrg;
34 
35 	struct mutex work_lock; /* protects data */
36 
37 	bool (*is_present)(struct collie_bat *bat);
38 	int gpio_full;
39 	int gpio_charge_on;
40 
41 	int technology;
42 
43 	int gpio_bat;
44 	int adc_bat;
45 	int adc_bat_divider;
46 	int bat_max;
47 	int bat_min;
48 
49 	int gpio_temp;
50 	int adc_temp;
51 	int adc_temp_divider;
52 };
53 
54 static struct collie_bat collie_bat_main;
55 
56 static unsigned long collie_read_bat(struct collie_bat *bat)
57 {
58 	unsigned long value = 0;
59 
60 	if (bat->gpio_bat < 0 || bat->adc_bat < 0)
61 		return 0;
62 	mutex_lock(&bat_lock);
63 	gpio_set_value(bat->gpio_bat, 1);
64 	msleep(5);
65 	ucb1x00_adc_enable(ucb);
66 	value = ucb1x00_adc_read(ucb, bat->adc_bat, UCB_SYNC);
67 	ucb1x00_adc_disable(ucb);
68 	gpio_set_value(bat->gpio_bat, 0);
69 	mutex_unlock(&bat_lock);
70 	value = value * 1000000 / bat->adc_bat_divider;
71 
72 	return value;
73 }
74 
75 static unsigned long collie_read_temp(struct collie_bat *bat)
76 {
77 	unsigned long value = 0;
78 	if (bat->gpio_temp < 0 || bat->adc_temp < 0)
79 		return 0;
80 
81 	mutex_lock(&bat_lock);
82 	gpio_set_value(bat->gpio_temp, 1);
83 	msleep(5);
84 	ucb1x00_adc_enable(ucb);
85 	value = ucb1x00_adc_read(ucb, bat->adc_temp, UCB_SYNC);
86 	ucb1x00_adc_disable(ucb);
87 	gpio_set_value(bat->gpio_temp, 0);
88 	mutex_unlock(&bat_lock);
89 
90 	value = value * 10000 / bat->adc_temp_divider;
91 
92 	return value;
93 }
94 
95 static int collie_bat_get_property(struct power_supply *psy,
96 			    enum power_supply_property psp,
97 			    union power_supply_propval *val)
98 {
99 	int ret = 0;
100 	struct collie_bat *bat = power_supply_get_drvdata(psy);
101 
102 	if (bat->is_present && !bat->is_present(bat)
103 			&& psp != POWER_SUPPLY_PROP_PRESENT) {
104 		return -ENODEV;
105 	}
106 
107 	switch (psp) {
108 	case POWER_SUPPLY_PROP_STATUS:
109 		val->intval = bat->status;
110 		break;
111 	case POWER_SUPPLY_PROP_TECHNOLOGY:
112 		val->intval = bat->technology;
113 		break;
114 	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
115 		val->intval = collie_read_bat(bat);
116 		break;
117 	case POWER_SUPPLY_PROP_VOLTAGE_MAX:
118 		if (bat->full_chrg == -1)
119 			val->intval = bat->bat_max;
120 		else
121 			val->intval = bat->full_chrg;
122 		break;
123 	case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
124 		val->intval = bat->bat_max;
125 		break;
126 	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
127 		val->intval = bat->bat_min;
128 		break;
129 	case POWER_SUPPLY_PROP_TEMP:
130 		val->intval = collie_read_temp(bat);
131 		break;
132 	case POWER_SUPPLY_PROP_PRESENT:
133 		val->intval = bat->is_present ? bat->is_present(bat) : 1;
134 		break;
135 	default:
136 		ret = -EINVAL;
137 		break;
138 	}
139 	return ret;
140 }
141 
142 static void collie_bat_external_power_changed(struct power_supply *psy)
143 {
144 	schedule_work(&bat_work);
145 }
146 
147 static irqreturn_t collie_bat_gpio_isr(int irq, void *data)
148 {
149 	pr_info("collie_bat_gpio irq\n");
150 	schedule_work(&bat_work);
151 	return IRQ_HANDLED;
152 }
153 
154 static void collie_bat_update(struct collie_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_on, 1);
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 = collie_read_bat(bat);
177 
178 			gpio_set_value(bat->gpio_charge_on, 0);
179 			bat->status = POWER_SUPPLY_STATUS_FULL;
180 		} else {
181 			gpio_set_value(bat->gpio_charge_on, 1);
182 			bat->status = POWER_SUPPLY_STATUS_CHARGING;
183 		}
184 	} else {
185 		gpio_set_value(bat->gpio_charge_on, 0);
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 
195 static void collie_bat_work(struct work_struct *work)
196 {
197 	collie_bat_update(&collie_bat_main);
198 }
199 
200 
201 static enum power_supply_property collie_bat_main_props[] = {
202 	POWER_SUPPLY_PROP_STATUS,
203 	POWER_SUPPLY_PROP_TECHNOLOGY,
204 	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
205 	POWER_SUPPLY_PROP_VOLTAGE_NOW,
206 	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
207 	POWER_SUPPLY_PROP_VOLTAGE_MAX,
208 	POWER_SUPPLY_PROP_PRESENT,
209 	POWER_SUPPLY_PROP_TEMP,
210 };
211 
212 static enum power_supply_property collie_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_VOLTAGE_MAX,
219 	POWER_SUPPLY_PROP_PRESENT,
220 };
221 
222 static const struct power_supply_desc collie_bat_main_desc = {
223 	.name		= "main-battery",
224 	.type		= POWER_SUPPLY_TYPE_BATTERY,
225 	.properties	= collie_bat_main_props,
226 	.num_properties	= ARRAY_SIZE(collie_bat_main_props),
227 	.get_property	= collie_bat_get_property,
228 	.external_power_changed = collie_bat_external_power_changed,
229 	.use_for_apm	= 1,
230 };
231 
232 static struct collie_bat collie_bat_main = {
233 	.status = POWER_SUPPLY_STATUS_DISCHARGING,
234 	.full_chrg = -1,
235 	.psy = NULL,
236 
237 	.gpio_full = COLLIE_GPIO_CO,
238 	.gpio_charge_on = COLLIE_GPIO_CHARGE_ON,
239 
240 	.technology = POWER_SUPPLY_TECHNOLOGY_LIPO,
241 
242 	.gpio_bat = COLLIE_GPIO_MBAT_ON,
243 	.adc_bat = UCB_ADC_INP_AD1,
244 	.adc_bat_divider = 155,
245 	.bat_max = 4310000,
246 	.bat_min = 1551 * 1000000 / 414,
247 
248 	.gpio_temp = COLLIE_GPIO_TMP_ON,
249 	.adc_temp = UCB_ADC_INP_AD0,
250 	.adc_temp_divider = 10000,
251 };
252 
253 static const struct power_supply_desc collie_bat_bu_desc = {
254 	.name		= "backup-battery",
255 	.type		= POWER_SUPPLY_TYPE_BATTERY,
256 	.properties	= collie_bat_bu_props,
257 	.num_properties	= ARRAY_SIZE(collie_bat_bu_props),
258 	.get_property	= collie_bat_get_property,
259 	.external_power_changed = collie_bat_external_power_changed,
260 };
261 
262 static struct collie_bat collie_bat_bu = {
263 	.status = POWER_SUPPLY_STATUS_UNKNOWN,
264 	.full_chrg = -1,
265 	.psy = NULL,
266 
267 	.gpio_full = -1,
268 	.gpio_charge_on = -1,
269 
270 	.technology = POWER_SUPPLY_TECHNOLOGY_LiMn,
271 
272 	.gpio_bat = COLLIE_GPIO_BBAT_ON,
273 	.adc_bat = UCB_ADC_INP_AD1,
274 	.adc_bat_divider = 155,
275 	.bat_max = 3000000,
276 	.bat_min = 1900000,
277 
278 	.gpio_temp = -1,
279 	.adc_temp = -1,
280 	.adc_temp_divider = -1,
281 };
282 
283 static struct gpio collie_batt_gpios[] = {
284 	{ COLLIE_GPIO_CO,	    GPIOF_IN,		"main battery full" },
285 	{ COLLIE_GPIO_MAIN_BAT_LOW, GPIOF_IN,		"main battery low" },
286 	{ COLLIE_GPIO_CHARGE_ON,    GPIOF_OUT_INIT_LOW,	"main charge on" },
287 	{ COLLIE_GPIO_MBAT_ON,	    GPIOF_OUT_INIT_LOW,	"main battery" },
288 	{ COLLIE_GPIO_TMP_ON,	    GPIOF_OUT_INIT_LOW,	"main battery temp" },
289 	{ COLLIE_GPIO_BBAT_ON,	    GPIOF_OUT_INIT_LOW,	"backup battery" },
290 };
291 
292 #ifdef CONFIG_PM
293 static int wakeup_enabled;
294 
295 static int collie_bat_suspend(struct ucb1x00_dev *dev)
296 {
297 	/* flush all pending status updates */
298 	flush_work(&bat_work);
299 
300 	if (device_may_wakeup(&dev->ucb->dev) &&
301 	    collie_bat_main.status == POWER_SUPPLY_STATUS_CHARGING)
302 		wakeup_enabled = !enable_irq_wake(gpio_to_irq(COLLIE_GPIO_CO));
303 	else
304 		wakeup_enabled = 0;
305 
306 	return 0;
307 }
308 
309 static int collie_bat_resume(struct ucb1x00_dev *dev)
310 {
311 	if (wakeup_enabled)
312 		disable_irq_wake(gpio_to_irq(COLLIE_GPIO_CO));
313 
314 	/* things may have changed while we were away */
315 	schedule_work(&bat_work);
316 	return 0;
317 }
318 #else
319 #define collie_bat_suspend NULL
320 #define collie_bat_resume NULL
321 #endif
322 
323 static int collie_bat_probe(struct ucb1x00_dev *dev)
324 {
325 	int ret;
326 	struct power_supply_config psy_main_cfg = {}, psy_bu_cfg = {};
327 
328 	if (!machine_is_collie())
329 		return -ENODEV;
330 
331 	ucb = dev->ucb;
332 
333 	ret = gpio_request_array(collie_batt_gpios,
334 				 ARRAY_SIZE(collie_batt_gpios));
335 	if (ret)
336 		return ret;
337 
338 	mutex_init(&collie_bat_main.work_lock);
339 
340 	INIT_WORK(&bat_work, collie_bat_work);
341 
342 	psy_main_cfg.drv_data = &collie_bat_main;
343 	collie_bat_main.psy = power_supply_register(&dev->ucb->dev,
344 						    &collie_bat_main_desc,
345 						    &psy_main_cfg);
346 	if (IS_ERR(collie_bat_main.psy)) {
347 		ret = PTR_ERR(collie_bat_main.psy);
348 		goto err_psy_reg_main;
349 	}
350 
351 	psy_bu_cfg.drv_data = &collie_bat_bu;
352 	collie_bat_bu.psy = power_supply_register(&dev->ucb->dev,
353 						  &collie_bat_bu_desc,
354 						  &psy_bu_cfg);
355 	if (IS_ERR(collie_bat_bu.psy)) {
356 		ret = PTR_ERR(collie_bat_bu.psy);
357 		goto err_psy_reg_bu;
358 	}
359 
360 	ret = request_irq(gpio_to_irq(COLLIE_GPIO_CO),
361 				collie_bat_gpio_isr,
362 				IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
363 				"main full", &collie_bat_main);
364 	if (ret)
365 		goto err_irq;
366 
367 	device_init_wakeup(&ucb->dev, 1);
368 	schedule_work(&bat_work);
369 
370 	return 0;
371 
372 err_irq:
373 	power_supply_unregister(collie_bat_bu.psy);
374 err_psy_reg_bu:
375 	power_supply_unregister(collie_bat_main.psy);
376 err_psy_reg_main:
377 
378 	/* see comment in collie_bat_remove */
379 	cancel_work_sync(&bat_work);
380 	gpio_free_array(collie_batt_gpios, ARRAY_SIZE(collie_batt_gpios));
381 	return ret;
382 }
383 
384 static void collie_bat_remove(struct ucb1x00_dev *dev)
385 {
386 	free_irq(gpio_to_irq(COLLIE_GPIO_CO), &collie_bat_main);
387 
388 	power_supply_unregister(collie_bat_bu.psy);
389 	power_supply_unregister(collie_bat_main.psy);
390 
391 	/*
392 	 * Now cancel the bat_work.  We won't get any more schedules,
393 	 * since all sources (isr and external_power_changed) are
394 	 * unregistered now.
395 	 */
396 	cancel_work_sync(&bat_work);
397 	gpio_free_array(collie_batt_gpios, ARRAY_SIZE(collie_batt_gpios));
398 }
399 
400 static struct ucb1x00_driver collie_bat_driver = {
401 	.add		= collie_bat_probe,
402 	.remove		= collie_bat_remove,
403 	.suspend	= collie_bat_suspend,
404 	.resume		= collie_bat_resume,
405 };
406 
407 static int __init collie_bat_init(void)
408 {
409 	return ucb1x00_register_driver(&collie_bat_driver);
410 }
411 
412 static void __exit collie_bat_exit(void)
413 {
414 	ucb1x00_unregister_driver(&collie_bat_driver);
415 }
416 
417 module_init(collie_bat_init);
418 module_exit(collie_bat_exit);
419 
420 MODULE_LICENSE("GPL");
421 MODULE_AUTHOR("Thomas Kunze");
422 MODULE_DESCRIPTION("Collie battery driver");
423