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[ARM] 5155/1: PalmTX battery monitor
This patch adds battery monitoring driver for PalmTX. It can read voltage from the battery and temperature. It also monitors charging/discharging status. Signed-off-by: Marek Vasut <marek.vasut@gmail.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Marek Vašut
Russell King
parent
359784084f
commit
d4b19c42ca
@ -22,6 +22,7 @@
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#include <linux/irq.h>
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#include <linux/gpio_keys.h>
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#include <linux/input.h>
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#include <linux/pda_power.h>
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#include <linux/pwm_backlight.h>
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#include <linux/gpio.h>
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@ -278,6 +279,66 @@ static struct pxa2xx_udc_mach_info palmtx_udc_info __initdata = {
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.udc_command = palmtx_udc_command,
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};
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/******************************************************************************
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* Power supply
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******************************************************************************/
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static int power_supply_init(struct device *dev)
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{
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int ret;
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ret = gpio_request(GPIO_NR_PALMTX_POWER_DETECT, "CABLE_STATE_AC");
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if (ret)
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goto err_cs_ac;
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ret = gpio_request(GPIO_NR_PALMTX_USB_DETECT_N, "CABLE_STATE_USB");
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if (ret)
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goto err_cs_usb;
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return 0;
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err_cs_usb:
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gpio_free(GPIO_NR_PALMTX_POWER_DETECT);
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err_cs_ac:
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return ret;
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}
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static int palmtx_is_ac_online(void)
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{
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return gpio_get_value(GPIO_NR_PALMTX_POWER_DETECT);
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}
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static int palmtx_is_usb_online(void)
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{
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return !gpio_get_value(GPIO_NR_PALMTX_USB_DETECT_N);
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}
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static void power_supply_exit(struct device *dev)
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{
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gpio_free(GPIO_NR_PALMTX_USB_DETECT_N);
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gpio_free(GPIO_NR_PALMTX_POWER_DETECT);
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}
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static char *palmtx_supplicants[] = {
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"main-battery",
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};
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static struct pda_power_pdata power_supply_info = {
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.init = power_supply_init,
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.is_ac_online = palmtx_is_ac_online,
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.is_usb_online = palmtx_is_usb_online,
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.exit = power_supply_exit,
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.supplied_to = palmtx_supplicants,
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.num_supplicants = ARRAY_SIZE(palmtx_supplicants),
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};
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static struct platform_device power_supply = {
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.name = "pda-power",
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.id = -1,
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.dev = {
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.platform_data = &power_supply_info,
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},
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};
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/******************************************************************************
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* Framebuffer
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******************************************************************************/
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@ -312,6 +373,7 @@ static struct platform_device *devices[] __initdata = {
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&palmtx_pxa_keys,
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#endif
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&palmtx_backlight,
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&power_supply,
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};
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static struct map_desc palmtx_io_desc[] __initdata = {
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@ -49,4 +49,10 @@ config BATTERY_OLPC
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help
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Say Y to enable support for the battery on the OLPC laptop.
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config BATTERY_PALMTX
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tristate "Palm T|X battery"
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depends on MACH_PALMTX
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help
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Say Y to enable support for the battery in Palm T|X.
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endif # POWER_SUPPLY
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@ -20,3 +20,4 @@ obj-$(CONFIG_APM_POWER) += apm_power.o
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obj-$(CONFIG_BATTERY_DS2760) += ds2760_battery.o
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obj-$(CONFIG_BATTERY_PMU) += pmu_battery.o
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obj-$(CONFIG_BATTERY_OLPC) += olpc_battery.o
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obj-$(CONFIG_BATTERY_PALMTX) += palmtx_battery.o
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198
drivers/power/palmtx_battery.c
Normal file
198
drivers/power/palmtx_battery.c
Normal file
@ -0,0 +1,198 @@
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/*
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* linux/drivers/power/palmtx_battery.c
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*
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* Battery measurement code for Palm T|X Handheld computer
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*
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* based on tosa_battery.c
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*
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* Copyright (C) 2008 Marek Vasut <marek.vasut@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/power_supply.h>
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#include <linux/wm97xx.h>
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#include <linux/delay.h>
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#include <linux/spinlock.h>
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#include <linux/interrupt.h>
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#include <linux/gpio.h>
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#include <asm/mach-types.h>
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#include <asm/arch/palmtx.h>
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static DEFINE_MUTEX(bat_lock);
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static struct work_struct bat_work;
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struct mutex work_lock;
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int bat_status = POWER_SUPPLY_STATUS_DISCHARGING;
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static unsigned long palmtx_read_bat(struct power_supply *bat_ps)
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{
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return wm97xx_read_aux_adc(bat_ps->dev->parent->driver_data,
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WM97XX_AUX_ID3) * 1000 / 414;
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}
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static unsigned long palmtx_read_temp(struct power_supply *bat_ps)
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{
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return wm97xx_read_aux_adc(bat_ps->dev->parent->driver_data,
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WM97XX_AUX_ID2);
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}
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static int palmtx_bat_get_property(struct power_supply *bat_ps,
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enum power_supply_property psp,
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union power_supply_propval *val)
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{
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switch (psp) {
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case POWER_SUPPLY_PROP_STATUS:
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val->intval = bat_status;
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break;
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case POWER_SUPPLY_PROP_TECHNOLOGY:
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val->intval = POWER_SUPPLY_TECHNOLOGY_LIPO;
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_NOW:
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val->intval = palmtx_read_bat(bat_ps);
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_MAX:
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case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
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val->intval = PALMTX_BAT_MAX_VOLTAGE;
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
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val->intval = PALMTX_BAT_MIN_VOLTAGE;
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break;
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case POWER_SUPPLY_PROP_TEMP:
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val->intval = palmtx_read_temp(bat_ps);
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break;
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case POWER_SUPPLY_PROP_PRESENT:
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val->intval = 1;
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static void palmtx_bat_external_power_changed(struct power_supply *bat_ps)
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{
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schedule_work(&bat_work);
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}
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static char *status_text[] = {
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[POWER_SUPPLY_STATUS_UNKNOWN] = "Unknown",
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[POWER_SUPPLY_STATUS_CHARGING] = "Charging",
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[POWER_SUPPLY_STATUS_DISCHARGING] = "Discharging",
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};
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static void palmtx_bat_update(struct power_supply *bat_ps)
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{
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int old_status = bat_status;
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mutex_lock(&work_lock);
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bat_status = gpio_get_value(GPIO_NR_PALMTX_POWER_DETECT) ?
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POWER_SUPPLY_STATUS_CHARGING :
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POWER_SUPPLY_STATUS_DISCHARGING;
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if (old_status != bat_status) {
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pr_debug("%s %s -> %s\n", bat_ps->name,
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status_text[old_status],
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status_text[bat_status]);
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power_supply_changed(bat_ps);
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}
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mutex_unlock(&work_lock);
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}
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static enum power_supply_property palmtx_bat_main_props[] = {
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POWER_SUPPLY_PROP_STATUS,
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POWER_SUPPLY_PROP_TECHNOLOGY,
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POWER_SUPPLY_PROP_VOLTAGE_NOW,
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POWER_SUPPLY_PROP_VOLTAGE_MAX,
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POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
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POWER_SUPPLY_PROP_TEMP,
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POWER_SUPPLY_PROP_PRESENT,
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};
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struct power_supply bat_ps = {
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.name = "main-battery",
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.type = POWER_SUPPLY_TYPE_BATTERY,
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.properties = palmtx_bat_main_props,
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.num_properties = ARRAY_SIZE(palmtx_bat_main_props),
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.get_property = palmtx_bat_get_property,
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.external_power_changed = palmtx_bat_external_power_changed,
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.use_for_apm = 1,
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};
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static void palmtx_bat_work(struct work_struct *work)
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{
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palmtx_bat_update(&bat_ps);
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}
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#ifdef CONFIG_PM
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static int palmtx_bat_suspend(struct platform_device *dev, pm_message_t state)
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{
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flush_scheduled_work();
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return 0;
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}
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static int palmtx_bat_resume(struct platform_device *dev)
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{
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schedule_work(&bat_work);
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return 0;
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}
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#else
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#define palmtx_bat_suspend NULL
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#define palmtx_bat_resume NULL
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#endif
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static int __devinit palmtx_bat_probe(struct platform_device *dev)
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{
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int ret = 0;
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if (!machine_is_palmtx())
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return -ENODEV;
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mutex_init(&work_lock);
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INIT_WORK(&bat_work, palmtx_bat_work);
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ret = power_supply_register(&dev->dev, &bat_ps);
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if (!ret)
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schedule_work(&bat_work);
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return ret;
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}
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static int __devexit palmtx_bat_remove(struct platform_device *dev)
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{
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power_supply_unregister(&bat_ps);
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return 0;
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}
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static struct platform_driver palmtx_bat_driver = {
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.driver.name = "wm97xx-battery",
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.driver.owner = THIS_MODULE,
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.probe = palmtx_bat_probe,
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.remove = __devexit_p(palmtx_bat_remove),
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.suspend = palmtx_bat_suspend,
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.resume = palmtx_bat_resume,
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};
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static int __init palmtx_bat_init(void)
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{
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return platform_driver_register(&palmtx_bat_driver);
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}
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static void __exit palmtx_bat_exit(void)
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{
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platform_driver_unregister(&palmtx_bat_driver);
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}
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module_init(palmtx_bat_init);
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module_exit(palmtx_bat_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
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MODULE_DESCRIPTION("Palm T|X battery driver");
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