collie: add battery driver
authorThomas Kunze <thommycheck@gmx.de>
Tue, 10 Feb 2009 13:12:29 +0000 (14:12 +0100)
committerThomas Kunze <tkunze@tkunze-desktop.(none)>
Fri, 27 Nov 2009 20:07:23 +0000 (21:07 +0100)
This driver is based on tosa_battery.c.

drivers/power/Kconfig
drivers/power/Makefile
drivers/power/collie_battery.c [new file with mode: 0644]

index cea6cef27e893f36f96d168724e6befa5429e085..1186749255162501b3179b46568de528a4f94a39 100644 (file)
@@ -77,6 +77,13 @@ config BATTERY_TOSA
          Say Y to enable support for the battery on the Sharp Zaurus
          SL-6000 (tosa) models.
 
+config BATTERY_COLLIE
+       tristate "Sharp SL-5500 (collie) battery"
+       depends on SA1100_COLLIE && MCP_UCB1200
+       help
+         Say Y to enable support for the battery on the Sharp Zaurus
+         SL-5500 (collie) models.
+
 config BATTERY_WM97XX
        bool "WM97xx generic battery driver"
        depends on TOUCHSCREEN_WM97XX=y
index b96f29d91c284b3719075d4995f3b5d0f20598fc..356cdfd3c8b250888d27f91d7bee72af1b692b90 100644 (file)
@@ -24,6 +24,7 @@ obj-$(CONFIG_BATTERY_DS2782)  += ds2782_battery.o
 obj-$(CONFIG_BATTERY_PMU)      += pmu_battery.o
 obj-$(CONFIG_BATTERY_OLPC)     += olpc_battery.o
 obj-$(CONFIG_BATTERY_TOSA)     += tosa_battery.o
+obj-$(CONFIG_BATTERY_COLLIE)   += collie_battery.o
 obj-$(CONFIG_BATTERY_WM97XX)   += wm97xx_battery.o
 obj-$(CONFIG_BATTERY_BQ27x00)  += bq27x00_battery.o
 obj-$(CONFIG_BATTERY_DA9030)   += da9030_battery.o
diff --git a/drivers/power/collie_battery.c b/drivers/power/collie_battery.c
new file mode 100644 (file)
index 0000000..039f41a
--- /dev/null
@@ -0,0 +1,418 @@
+/*
+ * Battery and Power Management code for the Sharp SL-5x00
+ *
+ * Copyright (C) 2009 Thomas Kunze
+ *
+ * based on tosa_battery.c
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+#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.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);
+       int gpio_full;
+       int gpio_charge_on;
+
+       int technology;
+
+       int gpio_bat;
+       int adc_bat;
+       int adc_bat_divider;
+       int bat_max;
+       int bat_min;
+
+       int 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 < 0 || bat->adc_bat < 0)
+               return 0;
+       mutex_lock(&bat_lock);
+       gpio_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);
+       gpio_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 < 0 || bat->adc_temp < 0)
+               return 0;
+
+       mutex_lock(&bat_lock);
+       gpio_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);
+       gpio_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 = container_of(psy, struct collie_bat, 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: %d\n", gpio_get_value(irq_to_gpio(irq)));
+       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->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) {
+                       gpio_set_value(bat->gpio_charge_on, 1);
+                       mdelay(15);
+               }
+
+               if (gpio_get_value(bat->gpio_full)) {
+                       if (old == POWER_SUPPLY_STATUS_CHARGING ||
+                                       bat->full_chrg == -1)
+                               bat->full_chrg = collie_read_bat(bat);
+
+                       gpio_set_value(bat->gpio_charge_on, 0);
+                       bat->status = POWER_SUPPLY_STATUS_FULL;
+               } else {
+                       gpio_set_value(bat->gpio_charge_on, 1);
+                       bat->status = POWER_SUPPLY_STATUS_CHARGING;
+               }
+       } else {
+               gpio_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 struct collie_bat collie_bat_main = {
+       .status = POWER_SUPPLY_STATUS_DISCHARGING,
+       .full_chrg = -1,
+       .psy = {
+               .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,
+       },
+
+       .gpio_full = COLLIE_GPIO_CO,
+       .gpio_charge_on = COLLIE_GPIO_CHARGE_ON,
+
+       .technology = POWER_SUPPLY_TECHNOLOGY_LIPO,
+
+       .gpio_bat = COLLIE_GPIO_MBAT_ON,
+       .adc_bat = UCB_ADC_INP_AD1,
+       .adc_bat_divider = 155,
+       .bat_max = 4310000,
+       .bat_min = 1551 * 1000000 / 414,
+
+       .gpio_temp = COLLIE_GPIO_TMP_ON,
+       .adc_temp = UCB_ADC_INP_AD0,
+       .adc_temp_divider = 10000,
+};
+
+static struct collie_bat collie_bat_bu = {
+       .status = POWER_SUPPLY_STATUS_UNKNOWN,
+       .full_chrg = -1,
+
+       .psy = {
+               .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,
+       },
+
+       .gpio_full = -1,
+       .gpio_charge_on = -1,
+
+       .technology = POWER_SUPPLY_TECHNOLOGY_LiMn,
+
+       .gpio_bat = COLLIE_GPIO_BBAT_ON,
+       .adc_bat = UCB_ADC_INP_AD1,
+       .adc_bat_divider = 155,
+       .bat_max = 3000000,
+       .bat_min = 1900000,
+
+       .gpio_temp = -1,
+       .adc_temp = -1,
+       .adc_temp_divider = -1,
+};
+
+static struct {
+       int gpio;
+       char *name;
+       bool output;
+       int value;
+} gpios[] = {
+       { COLLIE_GPIO_CO,               "main battery full",    0, 0 },
+       { COLLIE_GPIO_MAIN_BAT_LOW,     "main battery low",     0, 0 },
+       { COLLIE_GPIO_CHARGE_ON,        "main charge on",       1, 0 },
+       { COLLIE_GPIO_MBAT_ON,          "main battery",         1, 0 },
+       { COLLIE_GPIO_TMP_ON,           "main battery temp",    1, 0 },
+       { COLLIE_GPIO_BBAT_ON,          "backup battery",       1, 0 },
+};
+
+#ifdef CONFIG_PM
+static int collie_bat_suspend(struct ucb1x00_dev *dev, pm_message_t state)
+{
+       /* flush all pending status updates */
+       flush_scheduled_work();
+       return 0;
+}
+
+static int collie_bat_resume(struct ucb1x00_dev *dev)
+{
+       /* 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 __devinit collie_bat_probe(struct ucb1x00_dev *dev)
+{
+       int ret;
+       int i;
+
+       if (!machine_is_collie())
+               return -ENODEV;
+
+       ucb = dev->ucb;
+
+       for (i = 0; i < ARRAY_SIZE(gpios); i++) {
+               ret = gpio_request(gpios[i].gpio, gpios[i].name);
+               if (ret) {
+                       i--;
+                       goto err_gpio;
+               }
+
+               if (gpios[i].output)
+                       ret = gpio_direction_output(gpios[i].gpio,
+                                       gpios[i].value);
+               else
+                       ret = gpio_direction_input(gpios[i].gpio);
+
+               if (ret)
+                       goto err_gpio;
+       }
+
+       mutex_init(&collie_bat_main.work_lock);
+
+       INIT_WORK(&bat_work, collie_bat_work);
+
+       ret = power_supply_register(&dev->ucb->dev, &collie_bat_main.psy);
+       if (ret)
+               goto err_psy_reg_main;
+       ret = power_supply_register(&dev->ucb->dev, &collie_bat_bu.psy);
+       if (ret)
+               goto err_psy_reg_bu;
+
+       ret = request_irq(gpio_to_irq(COLLIE_GPIO_CO),
+                               collie_bat_gpio_isr,
+                               IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
+                               "main full", &collie_bat_main);
+       if (!ret) {
+               schedule_work(&bat_work);
+               return 0;
+       }
+       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 */
+       flush_scheduled_work();
+
+       i--;
+err_gpio:
+       for (; i >= 0; i--)
+               gpio_free(gpios[i].gpio);
+
+       return ret;
+}
+
+static void __devexit collie_bat_remove(struct ucb1x00_dev *dev)
+{
+       int i;
+
+       free_irq(gpio_to_irq(COLLIE_GPIO_CO), &collie_bat_main);
+
+       power_supply_unregister(&collie_bat_bu.psy);
+       power_supply_unregister(&collie_bat_main.psy);
+
+       /*
+        * now flush all pending work.
+        * we won't get any more schedules, since all
+        * sources (isr and external_power_changed)
+        * are unregistered now.
+        */
+       flush_scheduled_work();
+
+       for (i = ARRAY_SIZE(gpios) - 1; i >= 0; i--)
+               gpio_free(gpios[i].gpio);
+}
+
+static struct ucb1x00_driver collie_bat_driver = {
+       .add            = collie_bat_probe,
+       .remove         = __devexit_p(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");