2 * Battery and Power Management code for the Sharp SL-6000x
4 * Copyright (c) 2005 Dirk Opfer
5 * Copyright (c) 2008 Dmitry Baryshkov
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/power_supply.h>
15 #include <linux/wm97xx.h>
16 #include <linux/delay.h>
17 #include <linux/spinlock.h>
18 #include <linux/interrupt.h>
19 #include <linux/gpio.h>
21 #include <asm/mach-types.h>
22 #include <mach/tosa.h>
24 static DEFINE_MUTEX(bat_lock); /* protects gpio pins */
25 static struct work_struct bat_work;
29 struct power_supply psy;
32 struct mutex work_lock; /* protects data */
34 bool (*is_present)(struct tosa_bat *bat);
51 static struct tosa_bat tosa_bat_main;
52 static struct tosa_bat tosa_bat_jacket;
54 static unsigned long tosa_read_bat(struct tosa_bat *bat)
56 unsigned long value = 0;
58 if (bat->gpio_bat < 0 || bat->adc_bat < 0)
61 mutex_lock(&bat_lock);
62 gpio_set_value(bat->gpio_bat, 1);
64 value = wm97xx_read_aux_adc(bat->psy.dev->parent->driver_data,
66 gpio_set_value(bat->gpio_bat, 0);
67 mutex_unlock(&bat_lock);
69 value = value * 1000000 / bat->adc_bat_divider;
74 static unsigned long tosa_read_temp(struct tosa_bat *bat)
76 unsigned long value = 0;
78 if (bat->gpio_temp < 0 || bat->adc_temp < 0)
81 mutex_lock(&bat_lock);
82 gpio_set_value(bat->gpio_temp, 1);
84 value = wm97xx_read_aux_adc(bat->psy.dev->parent->driver_data,
86 gpio_set_value(bat->gpio_temp, 0);
87 mutex_unlock(&bat_lock);
89 value = value * 10000 / bat->adc_temp_divider;
94 static int tosa_bat_get_property(struct power_supply *psy,
95 enum power_supply_property psp,
96 union power_supply_propval *val)
99 struct tosa_bat *bat = container_of(psy, struct tosa_bat, psy);
101 if (bat->is_present && !bat->is_present(bat)
102 && psp != POWER_SUPPLY_PROP_PRESENT) {
107 case POWER_SUPPLY_PROP_STATUS:
108 val->intval = bat->status;
110 case POWER_SUPPLY_PROP_TECHNOLOGY:
111 val->intval = bat->technology;
113 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
114 val->intval = tosa_read_bat(bat);
116 case POWER_SUPPLY_PROP_VOLTAGE_MAX:
117 if (bat->full_chrg == -1)
118 val->intval = bat->bat_max;
120 val->intval = bat->full_chrg;
122 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
123 val->intval = bat->bat_max;
125 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
126 val->intval = bat->bat_min;
128 case POWER_SUPPLY_PROP_TEMP:
129 val->intval = tosa_read_temp(bat);
131 case POWER_SUPPLY_PROP_PRESENT:
132 val->intval = bat->is_present ? bat->is_present(bat) : 1;
141 static bool tosa_jacket_bat_is_present(struct tosa_bat *bat)
143 return gpio_get_value(TOSA_GPIO_JACKET_DETECT) == 0;
146 static void tosa_bat_external_power_changed(struct power_supply *psy)
148 schedule_work(&bat_work);
151 static irqreturn_t tosa_bat_gpio_isr(int irq, void *data)
153 pr_info("tosa_bat_gpio irq: %d\n", gpio_get_value(irq_to_gpio(irq)));
154 schedule_work(&bat_work);
158 static void tosa_bat_update(struct tosa_bat *bat)
161 struct power_supply *psy = &bat->psy;
163 mutex_lock(&bat->work_lock);
167 if (bat->is_present && !bat->is_present(bat)) {
168 printk(KERN_NOTICE "%s not present\n", psy->name);
169 bat->status = POWER_SUPPLY_STATUS_UNKNOWN;
171 } else if (power_supply_am_i_supplied(psy)) {
172 if (bat->status == POWER_SUPPLY_STATUS_DISCHARGING) {
173 gpio_set_value(bat->gpio_charge_off, 0);
177 if (gpio_get_value(bat->gpio_full)) {
178 if (old == POWER_SUPPLY_STATUS_CHARGING ||
179 bat->full_chrg == -1)
180 bat->full_chrg = tosa_read_bat(bat);
182 gpio_set_value(bat->gpio_charge_off, 1);
183 bat->status = POWER_SUPPLY_STATUS_FULL;
185 gpio_set_value(bat->gpio_charge_off, 0);
186 bat->status = POWER_SUPPLY_STATUS_CHARGING;
189 gpio_set_value(bat->gpio_charge_off, 1);
190 bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
193 if (old != bat->status)
194 power_supply_changed(psy);
196 mutex_unlock(&bat->work_lock);
199 static void tosa_bat_work(struct work_struct *work)
201 tosa_bat_update(&tosa_bat_main);
202 tosa_bat_update(&tosa_bat_jacket);
206 static enum power_supply_property tosa_bat_main_props[] = {
207 POWER_SUPPLY_PROP_STATUS,
208 POWER_SUPPLY_PROP_TECHNOLOGY,
209 POWER_SUPPLY_PROP_VOLTAGE_NOW,
210 POWER_SUPPLY_PROP_VOLTAGE_MAX,
211 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
212 POWER_SUPPLY_PROP_TEMP,
213 POWER_SUPPLY_PROP_PRESENT,
216 static enum power_supply_property tosa_bat_bu_props[] = {
217 POWER_SUPPLY_PROP_STATUS,
218 POWER_SUPPLY_PROP_TECHNOLOGY,
219 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
220 POWER_SUPPLY_PROP_VOLTAGE_NOW,
221 POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
222 POWER_SUPPLY_PROP_PRESENT,
225 static struct tosa_bat tosa_bat_main = {
226 .status = POWER_SUPPLY_STATUS_DISCHARGING,
229 .name = "main-battery",
230 .type = POWER_SUPPLY_TYPE_BATTERY,
231 .properties = tosa_bat_main_props,
232 .num_properties = ARRAY_SIZE(tosa_bat_main_props),
233 .get_property = tosa_bat_get_property,
234 .external_power_changed = tosa_bat_external_power_changed,
238 .gpio_full = TOSA_GPIO_BAT0_CRG,
239 .gpio_charge_off = TOSA_GPIO_CHARGE_OFF,
241 .technology = POWER_SUPPLY_TECHNOLOGY_LIPO,
243 .gpio_bat = TOSA_GPIO_BAT0_V_ON,
244 .adc_bat = WM97XX_AUX_ID3,
245 .adc_bat_divider = 414,
247 .bat_min = 1551 * 1000000 / 414,
249 .gpio_temp = TOSA_GPIO_BAT1_TH_ON,
250 .adc_temp = WM97XX_AUX_ID2,
251 .adc_temp_divider = 10000,
254 static struct tosa_bat tosa_bat_jacket = {
255 .status = POWER_SUPPLY_STATUS_DISCHARGING,
258 .name = "jacket-battery",
259 .type = POWER_SUPPLY_TYPE_BATTERY,
260 .properties = tosa_bat_main_props,
261 .num_properties = ARRAY_SIZE(tosa_bat_main_props),
262 .get_property = tosa_bat_get_property,
263 .external_power_changed = tosa_bat_external_power_changed,
266 .is_present = tosa_jacket_bat_is_present,
267 .gpio_full = TOSA_GPIO_BAT1_CRG,
268 .gpio_charge_off = TOSA_GPIO_CHARGE_OFF_JC,
270 .technology = POWER_SUPPLY_TECHNOLOGY_LIPO,
272 .gpio_bat = TOSA_GPIO_BAT1_V_ON,
273 .adc_bat = WM97XX_AUX_ID3,
274 .adc_bat_divider = 414,
276 .bat_min = 1551 * 1000000 / 414,
278 .gpio_temp = TOSA_GPIO_BAT0_TH_ON,
279 .adc_temp = WM97XX_AUX_ID2,
280 .adc_temp_divider = 10000,
283 static struct tosa_bat tosa_bat_bu = {
284 .status = POWER_SUPPLY_STATUS_UNKNOWN,
288 .name = "backup-battery",
289 .type = POWER_SUPPLY_TYPE_BATTERY,
290 .properties = tosa_bat_bu_props,
291 .num_properties = ARRAY_SIZE(tosa_bat_bu_props),
292 .get_property = tosa_bat_get_property,
293 .external_power_changed = tosa_bat_external_power_changed,
297 .gpio_charge_off = -1,
299 .technology = POWER_SUPPLY_TECHNOLOGY_LiMn,
301 .gpio_bat = TOSA_GPIO_BU_CHRG_ON,
302 .adc_bat = WM97XX_AUX_ID4,
303 .adc_bat_divider = 1266,
307 .adc_temp_divider = -1,
316 { TOSA_GPIO_CHARGE_OFF, "main charge off", 1, 1 },
317 { TOSA_GPIO_CHARGE_OFF_JC, "jacket charge off", 1, 1 },
318 { TOSA_GPIO_BAT_SW_ON, "battery switch", 1, 0 },
319 { TOSA_GPIO_BAT0_V_ON, "main battery", 1, 0 },
320 { TOSA_GPIO_BAT1_V_ON, "jacket battery", 1, 0 },
321 { TOSA_GPIO_BAT1_TH_ON, "main battery temp", 1, 0 },
322 { TOSA_GPIO_BAT0_TH_ON, "jacket battery temp", 1, 0 },
323 { TOSA_GPIO_BU_CHRG_ON, "backup battery", 1, 0 },
324 { TOSA_GPIO_BAT0_CRG, "main battery full", 0, 0 },
325 { TOSA_GPIO_BAT1_CRG, "jacket battery full", 0, 0 },
326 { TOSA_GPIO_BAT0_LOW, "main battery low", 0, 0 },
327 { TOSA_GPIO_BAT1_LOW, "jacket battery low", 0, 0 },
328 { TOSA_GPIO_JACKET_DETECT, "jacket detect", 0, 0 },
332 static int tosa_bat_suspend(struct platform_device *dev, pm_message_t state)
334 /* flush all pending status updates */
335 flush_scheduled_work();
339 static int tosa_bat_resume(struct platform_device *dev)
341 /* things may have changed while we were away */
342 schedule_work(&bat_work);
346 #define tosa_bat_suspend NULL
347 #define tosa_bat_resume NULL
350 static int __devinit tosa_bat_probe(struct platform_device *dev)
355 if (!machine_is_tosa())
358 for (i = 0; i < ARRAY_SIZE(gpios); i++) {
359 ret = gpio_request(gpios[i].gpio, gpios[i].name);
366 ret = gpio_direction_output(gpios[i].gpio,
369 ret = gpio_direction_input(gpios[i].gpio);
375 mutex_init(&tosa_bat_main.work_lock);
376 mutex_init(&tosa_bat_jacket.work_lock);
378 INIT_WORK(&bat_work, tosa_bat_work);
380 ret = power_supply_register(&dev->dev, &tosa_bat_main.psy);
382 goto err_psy_reg_main;
383 ret = power_supply_register(&dev->dev, &tosa_bat_jacket.psy);
385 goto err_psy_reg_jacket;
386 ret = power_supply_register(&dev->dev, &tosa_bat_bu.psy);
390 ret = request_irq(gpio_to_irq(TOSA_GPIO_BAT0_CRG),
392 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
393 "main full", &tosa_bat_main);
397 ret = request_irq(gpio_to_irq(TOSA_GPIO_BAT1_CRG),
399 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
400 "jacket full", &tosa_bat_jacket);
404 ret = request_irq(gpio_to_irq(TOSA_GPIO_JACKET_DETECT),
406 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
407 "jacket detect", &tosa_bat_jacket);
409 schedule_work(&bat_work);
413 free_irq(gpio_to_irq(TOSA_GPIO_BAT1_CRG), &tosa_bat_jacket);
415 free_irq(gpio_to_irq(TOSA_GPIO_BAT0_CRG), &tosa_bat_main);
417 power_supply_unregister(&tosa_bat_bu.psy);
419 power_supply_unregister(&tosa_bat_jacket.psy);
421 power_supply_unregister(&tosa_bat_main.psy);
424 /* see comment in tosa_bat_remove */
425 flush_scheduled_work();
430 gpio_free(gpios[i].gpio);
435 static int __devexit tosa_bat_remove(struct platform_device *dev)
439 free_irq(gpio_to_irq(TOSA_GPIO_JACKET_DETECT), &tosa_bat_jacket);
440 free_irq(gpio_to_irq(TOSA_GPIO_BAT1_CRG), &tosa_bat_jacket);
441 free_irq(gpio_to_irq(TOSA_GPIO_BAT0_CRG), &tosa_bat_main);
443 power_supply_unregister(&tosa_bat_bu.psy);
444 power_supply_unregister(&tosa_bat_jacket.psy);
445 power_supply_unregister(&tosa_bat_main.psy);
448 * now flush all pending work.
449 * we won't get any more schedules, since all
450 * sources (isr and external_power_changed)
451 * are unregistered now.
453 flush_scheduled_work();
455 for (i = ARRAY_SIZE(gpios) - 1; i >= 0; i--)
456 gpio_free(gpios[i].gpio);
461 static struct platform_driver tosa_bat_driver = {
462 .driver.name = "wm97xx-battery",
463 .driver.owner = THIS_MODULE,
464 .probe = tosa_bat_probe,
465 .remove = __devexit_p(tosa_bat_remove),
466 .suspend = tosa_bat_suspend,
467 .resume = tosa_bat_resume,
470 static int __init tosa_bat_init(void)
472 return platform_driver_register(&tosa_bat_driver);
475 static void __exit tosa_bat_exit(void)
477 platform_driver_unregister(&tosa_bat_driver);
480 module_init(tosa_bat_init);
481 module_exit(tosa_bat_exit);
483 MODULE_LICENSE("GPL");
484 MODULE_AUTHOR("Dmitry Baryshkov");
485 MODULE_DESCRIPTION("Tosa battery driver");
486 MODULE_ALIAS("platform:wm97xx-battery");