From cef437e3a9b6d229d4ed3730cde047007267df6d Mon Sep 17 00:00:00 2001 From: Daniel Mack Date: Tue, 28 Apr 2009 10:55:02 +0200 Subject: w1: ds2760_battery: add support for sleep mode feature This adds support for ds2760's sleep mode feature. With this feature enabled, the chip enters a deep sleep mode and disconnects from the battery when the w1 line is held down for more than 2 seconds. This new behaviour can be switched on and off using a new module parameter. Signed-off-by: Daniel Mack Cc: Szabolcs Gyurko Acked-by: Matt Reimer Acked-by: Evgeniy Polyakov Signed-off-by: Anton Vorontsov --- drivers/power/ds2760_battery.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) (limited to 'drivers/power') diff --git a/drivers/power/ds2760_battery.c b/drivers/power/ds2760_battery.c index 933100909..520b5c4 100644 --- a/drivers/power/ds2760_battery.c +++ b/drivers/power/ds2760_battery.c @@ -62,6 +62,10 @@ static unsigned int cache_time = 1000; module_param(cache_time, uint, 0644); MODULE_PARM_DESC(cache_time, "cache time in milliseconds"); +static unsigned int pmod_enabled; +module_param(pmod_enabled, bool, 0644); +MODULE_PARM_DESC(pmod_enabled, "PMOD enable bit"); + /* Some batteries have their rated capacity stored a N * 10 mAh, while * others use an index into this table. */ static int rated_capacities[] = { @@ -259,6 +263,17 @@ static void ds2760_battery_update_status(struct ds2760_device_info *di) power_supply_changed(&di->bat); } +static void ds2760_battery_write_status(struct ds2760_device_info *di, + char status) +{ + if (status == di->raw[DS2760_STATUS_REG]) + return; + + w1_ds2760_write(di->w1_dev, &status, DS2760_STATUS_WRITE_REG, 1); + w1_ds2760_store_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1); + w1_ds2760_recall_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1); +} + static void ds2760_battery_work(struct work_struct *work) { struct ds2760_device_info *di = container_of(work, @@ -342,6 +357,7 @@ static enum power_supply_property ds2760_battery_props[] = { static int ds2760_battery_probe(struct platform_device *pdev) { + char status; int retval = 0; struct ds2760_device_info *di; @@ -371,6 +387,16 @@ static int ds2760_battery_probe(struct platform_device *pdev) goto batt_failed; } + /* enable sleep mode feature */ + ds2760_battery_read_status(di); + status = di->raw[DS2760_STATUS_REG]; + if (pmod_enabled) + status |= DS2760_STATUS_PMOD; + else + status &= ~DS2760_STATUS_PMOD; + + ds2760_battery_write_status(di, status); + INIT_DELAYED_WORK(&di->monitor_work, ds2760_battery_work); di->monitor_wqueue = create_singlethread_workqueue(dev_name(&pdev->dev)); if (!di->monitor_wqueue) { -- cgit v1.1