2 * Battery and Power Management code for the Sharp SL-5x00
4 * Copyright (C) 2009 Thomas Kunze
6 * based on tosa_battery.c
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.
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>
22 #include <asm/mach/sharpsl_param.h>
23 #include <asm/mach-types.h>
24 #include <mach/collie.h>
26 static DEFINE_MUTEX(bat_lock); /* protects gpio pins */
27 static struct work_struct bat_work;
28 static struct ucb1x00 *ucb;
32 struct power_supply *psy;
35 struct mutex work_lock; /* protects data */
37 bool (*is_present)(struct collie_bat *bat);
54 static struct collie_bat collie_bat_main;
56 static unsigned long collie_read_bat(struct collie_bat *bat)
58 unsigned long value = 0;
60 if (bat->gpio_bat < 0 || bat->adc_bat < 0)
62 mutex_lock(&bat_lock);
63 gpio_set_value(bat->gpio_bat, 1);
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;
75 static unsigned long collie_read_temp(struct collie_bat *bat)
77 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 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);
90 value = value * 10000 / bat->adc_temp_divider;
95 static int collie_bat_get_property(struct power_supply *psy,
96 enum power_supply_property psp,
97 union power_supply_propval *val)
100 struct collie_bat *bat = power_supply_get_drvdata(psy);
102 if (bat->is_present && !bat->is_present(bat)
103 && psp != POWER_SUPPLY_PROP_PRESENT) {
108 case POWER_SUPPLY_PROP_STATUS:
109 val->intval = bat->status;
111 case POWER_SUPPLY_PROP_TECHNOLOGY:
112 val->intval = bat->technology;
114 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
115 val->intval = collie_read_bat(bat);
117 case POWER_SUPPLY_PROP_VOLTAGE_MAX:
118 if (bat->full_chrg == -1)
119 val->intval = bat->bat_max;
121 val->intval = bat->full_chrg;
123 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
124 val->intval = bat->bat_max;
126 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
127 val->intval = bat->bat_min;
129 case POWER_SUPPLY_PROP_TEMP:
130 val->intval = collie_read_temp(bat);
132 case POWER_SUPPLY_PROP_PRESENT:
133 val->intval = bat->is_present ? bat->is_present(bat) : 1;
142 static void collie_bat_external_power_changed(struct power_supply *psy)
144 schedule_work(&bat_work);
147 static irqreturn_t collie_bat_gpio_isr(int irq, void *data)
149 pr_info("collie_bat_gpio irq\n");
150 schedule_work(&bat_work);
154 static void collie_bat_update(struct collie_bat *bat)
157 struct power_supply *psy = bat->psy;
159 mutex_lock(&bat->work_lock);
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;
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);
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);
178 gpio_set_value(bat->gpio_charge_on, 0);
179 bat->status = POWER_SUPPLY_STATUS_FULL;
181 gpio_set_value(bat->gpio_charge_on, 1);
182 bat->status = POWER_SUPPLY_STATUS_CHARGING;
185 gpio_set_value(bat->gpio_charge_on, 0);
186 bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
189 if (old != bat->status)
190 power_supply_changed(psy);
192 mutex_unlock(&bat->work_lock);
195 static void collie_bat_work(struct work_struct *work)
197 collie_bat_update(&collie_bat_main);
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,
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,
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,
232 static struct collie_bat collie_bat_main = {
233 .status = POWER_SUPPLY_STATUS_DISCHARGING,
237 .gpio_full = COLLIE_GPIO_CO,
238 .gpio_charge_on = COLLIE_GPIO_CHARGE_ON,
240 .technology = POWER_SUPPLY_TECHNOLOGY_LIPO,
242 .gpio_bat = COLLIE_GPIO_MBAT_ON,
243 .adc_bat = UCB_ADC_INP_AD1,
244 .adc_bat_divider = 155,
246 .bat_min = 1551 * 1000000 / 414,
248 .gpio_temp = COLLIE_GPIO_TMP_ON,
249 .adc_temp = UCB_ADC_INP_AD0,
250 .adc_temp_divider = 10000,
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,
262 static struct collie_bat collie_bat_bu = {
263 .status = POWER_SUPPLY_STATUS_UNKNOWN,
268 .gpio_charge_on = -1,
270 .technology = POWER_SUPPLY_TECHNOLOGY_LiMn,
272 .gpio_bat = COLLIE_GPIO_BBAT_ON,
273 .adc_bat = UCB_ADC_INP_AD1,
274 .adc_bat_divider = 155,
280 .adc_temp_divider = -1,
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" },
293 static int wakeup_enabled;
295 static int collie_bat_suspend(struct ucb1x00_dev *dev)
297 /* flush all pending status updates */
298 flush_work(&bat_work);
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));
309 static int collie_bat_resume(struct ucb1x00_dev *dev)
312 disable_irq_wake(gpio_to_irq(COLLIE_GPIO_CO));
314 /* things may have changed while we were away */
315 schedule_work(&bat_work);
319 #define collie_bat_suspend NULL
320 #define collie_bat_resume NULL
323 static int collie_bat_probe(struct ucb1x00_dev *dev)
326 struct power_supply_config psy_main_cfg = {}, psy_bu_cfg = {};
328 if (!machine_is_collie())
333 ret = gpio_request_array(collie_batt_gpios,
334 ARRAY_SIZE(collie_batt_gpios));
338 mutex_init(&collie_bat_main.work_lock);
340 INIT_WORK(&bat_work, collie_bat_work);
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,
346 if (IS_ERR(collie_bat_main.psy)) {
347 ret = PTR_ERR(collie_bat_main.psy);
348 goto err_psy_reg_main;
351 psy_bu_cfg.drv_data = &collie_bat_bu;
352 collie_bat_bu.psy = power_supply_register(&dev->ucb->dev,
355 if (IS_ERR(collie_bat_bu.psy)) {
356 ret = PTR_ERR(collie_bat_bu.psy);
360 ret = request_irq(gpio_to_irq(COLLIE_GPIO_CO),
362 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
363 "main full", &collie_bat_main);
367 device_init_wakeup(&ucb->dev, 1);
368 schedule_work(&bat_work);
373 power_supply_unregister(collie_bat_bu.psy);
375 power_supply_unregister(collie_bat_main.psy);
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));
384 static void collie_bat_remove(struct ucb1x00_dev *dev)
386 free_irq(gpio_to_irq(COLLIE_GPIO_CO), &collie_bat_main);
388 power_supply_unregister(collie_bat_bu.psy);
389 power_supply_unregister(collie_bat_main.psy);
392 * Now cancel the bat_work. We won't get any more schedules,
393 * since all sources (isr and external_power_changed) are
396 cancel_work_sync(&bat_work);
397 gpio_free_array(collie_batt_gpios, ARRAY_SIZE(collie_batt_gpios));
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,
407 static int __init collie_bat_init(void)
409 return ucb1x00_register_driver(&collie_bat_driver);
412 static void __exit collie_bat_exit(void)
414 ucb1x00_unregister_driver(&collie_bat_driver);
417 module_init(collie_bat_init);
418 module_exit(collie_bat_exit);
420 MODULE_LICENSE("GPL");
421 MODULE_AUTHOR("Thomas Kunze");
422 MODULE_DESCRIPTION("Collie battery driver");