1 files changed, 485 insertions, 0 deletions

diff --git a/drivers/power/supply/collie_battery.c b/drivers/power/supply/collie_battery.c
new file mode 100644
index 0000000000..68390bd100
--- /dev/null
+++ b/drivers/power/supply/collie_battery.c
@@ -0,0 +1,485 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Battery and Power Management code for the Sharp SL-5x00
+ *
+ * Copyright (C) 2009 Thomas Kunze
+ *
+ * based on tosa_battery.c
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/power_supply.h>
+#include <linux/delay.h>
+#include <linux/spinlock.h>
+#include <linux/interrupt.h>
+#include <linux/gpio/driver.h>
+#include <linux/gpio/machine.h>
+#include <linux/gpio/consumer.h>
+#include <linux/mfd/ucb1x00.h>
+
+#include <asm/mach/sharpsl_param.h>
+#include <asm/mach-types.h>
+#include <mach/collie.h>
+
+static DEFINE_MUTEX(bat_lock); /* protects gpio pins */
+static struct work_struct bat_work;
+static struct ucb1x00 *ucb;
+
+struct collie_bat {
+	int status;
+	struct power_supply *psy;
+	int full_chrg;
+
+	struct mutex work_lock; /* protects data */
+
+	bool (*is_present)(struct collie_bat *bat);
+	struct gpio_desc *gpio_full;
+	struct gpio_desc *gpio_charge_on;
+
+	int technology;
+
+	struct gpio_desc *gpio_bat;
+	int adc_bat;
+	int adc_bat_divider;
+	int bat_max;
+	int bat_min;
+
+	struct gpio_desc *gpio_temp;
+	int adc_temp;
+	int adc_temp_divider;
+};
+
+static struct collie_bat collie_bat_main;
+
+static unsigned long collie_read_bat(struct collie_bat *bat)
+{
+	unsigned long value = 0;
+
+	if (!bat->gpio_bat || bat->adc_bat < 0)
+		return 0;
+	mutex_lock(&bat_lock);
+	gpiod_set_value(bat->gpio_bat, 1);
+	msleep(5);
+	ucb1x00_adc_enable(ucb);
+	value = ucb1x00_adc_read(ucb, bat->adc_bat, UCB_SYNC);
+	ucb1x00_adc_disable(ucb);
+	gpiod_set_value(bat->gpio_bat, 0);
+	mutex_unlock(&bat_lock);
+	value = value * 1000000 / bat->adc_bat_divider;
+
+	return value;
+}
+
+static unsigned long collie_read_temp(struct collie_bat *bat)
+{
+	unsigned long value = 0;
+	if (!bat->gpio_temp || bat->adc_temp < 0)
+		return 0;
+
+	mutex_lock(&bat_lock);
+	gpiod_set_value(bat->gpio_temp, 1);
+	msleep(5);
+	ucb1x00_adc_enable(ucb);
+	value = ucb1x00_adc_read(ucb, bat->adc_temp, UCB_SYNC);
+	ucb1x00_adc_disable(ucb);
+	gpiod_set_value(bat->gpio_temp, 0);
+	mutex_unlock(&bat_lock);
+
+	value = value * 10000 / bat->adc_temp_divider;
+
+	return value;
+}
+
+static int collie_bat_get_property(struct power_supply *psy,
+			    enum power_supply_property psp,
+			    union power_supply_propval *val)
+{
+	int ret = 0;
+	struct collie_bat *bat = power_supply_get_drvdata(psy);
+
+	if (bat->is_present && !bat->is_present(bat)
+			&& psp != POWER_SUPPLY_PROP_PRESENT) {
+		return -ENODEV;
+	}
+
+	switch (psp) {
+	case POWER_SUPPLY_PROP_STATUS:
+		val->intval = bat->status;
+		break;
+	case POWER_SUPPLY_PROP_TECHNOLOGY:
+		val->intval = bat->technology;
+		break;
+	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+		val->intval = collie_read_bat(bat);
+		break;
+	case POWER_SUPPLY_PROP_VOLTAGE_MAX:
+		if (bat->full_chrg == -1)
+			val->intval = bat->bat_max;
+		else
+			val->intval = bat->full_chrg;
+		break;
+	case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
+		val->intval = bat->bat_max;
+		break;
+	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
+		val->intval = bat->bat_min;
+		break;
+	case POWER_SUPPLY_PROP_TEMP:
+		val->intval = collie_read_temp(bat);
+		break;
+	case POWER_SUPPLY_PROP_PRESENT:
+		val->intval = bat->is_present ? bat->is_present(bat) : 1;
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+	return ret;
+}
+
+static void collie_bat_external_power_changed(struct power_supply *psy)
+{
+	schedule_work(&bat_work);
+}
+
+static irqreturn_t collie_bat_gpio_isr(int irq, void *data)
+{
+	pr_info("collie_bat_gpio irq\n");
+	schedule_work(&bat_work);
+	return IRQ_HANDLED;
+}
+
+static void collie_bat_update(struct collie_bat *bat)
+{
+	int old;
+	struct power_supply *psy = bat->psy;
+
+	mutex_lock(&bat->work_lock);
+
+	old = bat->status;
+
+	if (bat->is_present && !bat->is_present(bat)) {
+		printk(KERN_NOTICE "%s not present\n", psy->desc->name);
+		bat->status = POWER_SUPPLY_STATUS_UNKNOWN;
+		bat->full_chrg = -1;
+	} else if (power_supply_am_i_supplied(psy)) {
+		if (bat->status == POWER_SUPPLY_STATUS_DISCHARGING) {
+			gpiod_set_value(bat->gpio_charge_on, 1);
+			mdelay(15);
+		}
+
+		if (gpiod_get_value(bat->gpio_full)) {
+			if (old == POWER_SUPPLY_STATUS_CHARGING ||
+					bat->full_chrg == -1)
+				bat->full_chrg = collie_read_bat(bat);
+
+			gpiod_set_value(bat->gpio_charge_on, 0);
+			bat->status = POWER_SUPPLY_STATUS_FULL;
+		} else {
+			gpiod_set_value(bat->gpio_charge_on, 1);
+			bat->status = POWER_SUPPLY_STATUS_CHARGING;
+		}
+	} else {
+		gpiod_set_value(bat->gpio_charge_on, 0);
+		bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
+	}
+
+	if (old != bat->status)
+		power_supply_changed(psy);
+
+	mutex_unlock(&bat->work_lock);
+}
+
+static void collie_bat_work(struct work_struct *work)
+{
+	collie_bat_update(&collie_bat_main);
+}
+
+
+static enum power_supply_property collie_bat_main_props[] = {
+	POWER_SUPPLY_PROP_STATUS,
+	POWER_SUPPLY_PROP_TECHNOLOGY,
+	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
+	POWER_SUPPLY_PROP_VOLTAGE_NOW,
+	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
+	POWER_SUPPLY_PROP_VOLTAGE_MAX,
+	POWER_SUPPLY_PROP_PRESENT,
+	POWER_SUPPLY_PROP_TEMP,
+};
+
+static enum power_supply_property collie_bat_bu_props[] = {
+	POWER_SUPPLY_PROP_STATUS,
+	POWER_SUPPLY_PROP_TECHNOLOGY,
+	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
+	POWER_SUPPLY_PROP_VOLTAGE_NOW,
+	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
+	POWER_SUPPLY_PROP_VOLTAGE_MAX,
+	POWER_SUPPLY_PROP_PRESENT,
+};
+
+static const struct power_supply_desc collie_bat_main_desc = {
+	.name		= "main-battery",
+	.type		= POWER_SUPPLY_TYPE_BATTERY,
+	.properties	= collie_bat_main_props,
+	.num_properties	= ARRAY_SIZE(collie_bat_main_props),
+	.get_property	= collie_bat_get_property,
+	.external_power_changed = collie_bat_external_power_changed,
+	.use_for_apm	= 1,
+};
+
+static struct collie_bat collie_bat_main = {
+	.status = POWER_SUPPLY_STATUS_DISCHARGING,
+	.full_chrg = -1,
+	.psy = NULL,
+
+	.gpio_full = NULL,
+	.gpio_charge_on = NULL,
+
+	.technology = POWER_SUPPLY_TECHNOLOGY_LIPO,
+
+	.gpio_bat = NULL,
+	.adc_bat = UCB_ADC_INP_AD1,
+	.adc_bat_divider = 155,
+	.bat_max = 4310000,
+	.bat_min = 1551 * 1000000 / 414,
+
+	.gpio_temp = NULL,
+	.adc_temp = UCB_ADC_INP_AD0,
+	.adc_temp_divider = 10000,
+};
+
+static const struct power_supply_desc collie_bat_bu_desc = {
+	.name		= "backup-battery",
+	.type		= POWER_SUPPLY_TYPE_BATTERY,
+	.properties	= collie_bat_bu_props,
+	.num_properties	= ARRAY_SIZE(collie_bat_bu_props),
+	.get_property	= collie_bat_get_property,
+	.external_power_changed = collie_bat_external_power_changed,
+};
+
+static struct collie_bat collie_bat_bu = {
+	.status = POWER_SUPPLY_STATUS_UNKNOWN,
+	.full_chrg = -1,
+	.psy = NULL,
+
+	.gpio_full = NULL,
+	.gpio_charge_on = NULL,
+
+	.technology = POWER_SUPPLY_TECHNOLOGY_LiMn,
+
+	.gpio_bat = NULL,
+	.adc_bat = UCB_ADC_INP_AD1,
+	.adc_bat_divider = 155,
+	.bat_max = 3000000,
+	.bat_min = 1900000,
+
+	.gpio_temp = NULL,
+	.adc_temp = -1,
+	.adc_temp_divider = -1,
+};
+
+/* Obtained but unused GPIO */
+static struct gpio_desc *collie_mbat_low;
+
+#ifdef CONFIG_PM
+static int wakeup_enabled;
+
+static int collie_bat_suspend(struct ucb1x00_dev *dev)
+{
+	/* flush all pending status updates */
+	flush_work(&bat_work);
+
+	if (device_may_wakeup(&dev->ucb->dev) &&
+	    collie_bat_main.status == POWER_SUPPLY_STATUS_CHARGING)
+		wakeup_enabled = !enable_irq_wake(gpiod_to_irq(collie_bat_main.gpio_full));
+	else
+		wakeup_enabled = 0;
+
+	return 0;
+}
+
+static int collie_bat_resume(struct ucb1x00_dev *dev)
+{
+	if (wakeup_enabled)
+		disable_irq_wake(gpiod_to_irq(collie_bat_main.gpio_full));
+
+	/* things may have changed while we were away */
+	schedule_work(&bat_work);
+	return 0;
+}
+#else
+#define collie_bat_suspend NULL
+#define collie_bat_resume NULL
+#endif
+
+static int collie_bat_probe(struct ucb1x00_dev *dev)
+{
+	int ret;
+	struct power_supply_config psy_main_cfg = {}, psy_bu_cfg = {};
+	struct gpio_chip *gc = &dev->ucb->gpio;
+
+	if (!machine_is_collie())
+		return -ENODEV;
+
+	ucb = dev->ucb;
+
+	/* Obtain all the main battery GPIOs */
+	collie_bat_main.gpio_full = gpiod_get(&dev->ucb->dev,
+					      "main battery full",
+					      GPIOD_IN);
+	if (IS_ERR(collie_bat_main.gpio_full))
+		return PTR_ERR(collie_bat_main.gpio_full);
+
+	collie_mbat_low = gpiod_get(&dev->ucb->dev,
+				    "main battery low",
+				    GPIOD_IN);
+	if (IS_ERR(collie_mbat_low)) {
+		ret = PTR_ERR(collie_mbat_low);
+		goto err_put_gpio_full;
+	}
+
+	collie_bat_main.gpio_charge_on = gpiod_get(&dev->ucb->dev,
+						   "main charge on",
+						   GPIOD_OUT_LOW);
+	if (IS_ERR(collie_bat_main.gpio_charge_on)) {
+		ret = PTR_ERR(collie_bat_main.gpio_charge_on);
+		goto err_put_mbat_low;
+	}
+
+	/* COLLIE_GPIO_MBAT_ON = GPIO 7 on the UCB (TC35143) */
+	collie_bat_main.gpio_bat = gpiochip_request_own_desc(gc,
+						7,
+						"main battery",
+						GPIO_ACTIVE_HIGH,
+						GPIOD_OUT_LOW);
+	if (IS_ERR(collie_bat_main.gpio_bat)) {
+		ret = PTR_ERR(collie_bat_main.gpio_bat);
+		goto err_put_gpio_charge_on;
+	}
+
+	/* COLLIE_GPIO_TMP_ON = GPIO 9 on the UCB (TC35143) */
+	collie_bat_main.gpio_temp = gpiochip_request_own_desc(gc,
+						9,
+						"main battery temp",
+						GPIO_ACTIVE_HIGH,
+						GPIOD_OUT_LOW);
+	if (IS_ERR(collie_bat_main.gpio_temp)) {
+		ret = PTR_ERR(collie_bat_main.gpio_temp);
+		goto err_free_gpio_bat;
+	}
+
+	/*
+	 * Obtain the backup battery COLLIE_GPIO_BBAT_ON which is
+	 * GPIO 8 on the UCB (TC35143)
+	 */
+	collie_bat_bu.gpio_bat = gpiochip_request_own_desc(gc,
+						8,
+						"backup battery",
+						GPIO_ACTIVE_HIGH,
+						GPIOD_OUT_LOW);
+	if (IS_ERR(collie_bat_bu.gpio_bat)) {
+		ret = PTR_ERR(collie_bat_bu.gpio_bat);
+		goto err_free_gpio_temp;
+	}
+
+	mutex_init(&collie_bat_main.work_lock);
+
+	INIT_WORK(&bat_work, collie_bat_work);
+
+	psy_main_cfg.drv_data = &collie_bat_main;
+	collie_bat_main.psy = power_supply_register(&dev->ucb->dev,
+						    &collie_bat_main_desc,
+						    &psy_main_cfg);
+	if (IS_ERR(collie_bat_main.psy)) {
+		ret = PTR_ERR(collie_bat_main.psy);
+		goto err_psy_reg_main;
+	}
+
+	psy_bu_cfg.drv_data = &collie_bat_bu;
+	collie_bat_bu.psy = power_supply_register(&dev->ucb->dev,
+						  &collie_bat_bu_desc,
+						  &psy_bu_cfg);
+	if (IS_ERR(collie_bat_bu.psy)) {
+		ret = PTR_ERR(collie_bat_bu.psy);
+		goto err_psy_reg_bu;
+	}
+
+	ret = request_irq(gpiod_to_irq(collie_bat_main.gpio_full),
+				collie_bat_gpio_isr,
+				IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
+				"main full", &collie_bat_main);
+	if (ret)
+		goto err_irq;
+
+	device_init_wakeup(&ucb->dev, 1);
+	schedule_work(&bat_work);
+
+	return 0;
+
+err_irq:
+	power_supply_unregister(collie_bat_bu.psy);
+err_psy_reg_bu:
+	power_supply_unregister(collie_bat_main.psy);
+err_psy_reg_main:
+	/* see comment in collie_bat_remove */
+	cancel_work_sync(&bat_work);
+	gpiochip_free_own_desc(collie_bat_bu.gpio_bat);
+err_free_gpio_temp:
+	gpiochip_free_own_desc(collie_bat_main.gpio_temp);
+err_free_gpio_bat:
+	gpiochip_free_own_desc(collie_bat_main.gpio_bat);
+err_put_gpio_charge_on:
+	gpiod_put(collie_bat_main.gpio_charge_on);
+err_put_mbat_low:
+	gpiod_put(collie_mbat_low);
+err_put_gpio_full:
+	gpiod_put(collie_bat_main.gpio_full);
+
+	return ret;
+}
+
+static void collie_bat_remove(struct ucb1x00_dev *dev)
+{
+	free_irq(gpiod_to_irq(collie_bat_main.gpio_full), &collie_bat_main);
+	power_supply_unregister(collie_bat_bu.psy);
+	power_supply_unregister(collie_bat_main.psy);
+
+	/* These are obtained from the machine */
+	gpiod_put(collie_bat_main.gpio_full);
+	gpiod_put(collie_mbat_low);
+	gpiod_put(collie_bat_main.gpio_charge_on);
+	/* These are directly from the UCB so let's free them */
+	gpiochip_free_own_desc(collie_bat_main.gpio_bat);
+	gpiochip_free_own_desc(collie_bat_main.gpio_temp);
+	gpiochip_free_own_desc(collie_bat_bu.gpio_bat);
+	/*
+	 * Now cancel the bat_work.  We won't get any more schedules,
+	 * since all sources (isr and external_power_changed) are
+	 * unregistered now.
+	 */
+	cancel_work_sync(&bat_work);
+}
+
+static struct ucb1x00_driver collie_bat_driver = {
+	.add		= collie_bat_probe,
+	.remove		= collie_bat_remove,
+	.suspend	= collie_bat_suspend,
+	.resume		= collie_bat_resume,
+};
+
+static int __init collie_bat_init(void)
+{
+	return ucb1x00_register_driver(&collie_bat_driver);
+}
+
+static void __exit collie_bat_exit(void)
+{
+	ucb1x00_unregister_driver(&collie_bat_driver);
+}
+
+module_init(collie_bat_init);
+module_exit(collie_bat_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Thomas Kunze");
+MODULE_DESCRIPTION("Collie battery driver");