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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 <daniel@caiaq.de>
Cc: Szabolcs Gyurko <szabolcs.gyurko@tlt.hu>
Acked-by: Matt Reimer <mreimer@vpop.net>
Acked-by: Evgeniy Polyakov <zbr@ioremap.net>
Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>
This commit is contained in:
Daniel Mack 2009-04-28 10:55:02 +02:00 committed by Anton Vorontsov
parent 0b47b5703b
commit cef437e3a9
2 changed files with 31 additions and 0 deletions
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26
drivers/power/ds2760_battery.c
View File

@ -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) {

5
drivers/w1/slaves/w1_ds2760.h
View File

@ -25,6 +25,10 @@
#define DS2760_PROTECTION_REG 0x00
#define DS2760_STATUS_REG 0x01
#define DS2760_STATUS_IE (1 << 2)
#define DS2760_STATUS_SWEN (1 << 3)
#define DS2760_STATUS_RNAOP (1 << 4)
#define DS2760_STATUS_PMOD (1 << 5)
#define DS2760_EEPROM_REG 0x07
#define DS2760_SPECIAL_FEATURE_REG 0x08
#define DS2760_VOLTAGE_MSB 0x0c
@ -38,6 +42,7 @@
#define DS2760_EEPROM_BLOCK0 0x20
#define DS2760_ACTIVE_FULL 0x20
#define DS2760_EEPROM_BLOCK1 0x30
#define DS2760_STATUS_WRITE_REG 0x31
#define DS2760_RATED_CAPACITY 0x32
#define DS2760_CURRENT_OFFSET_BIAS 0x33
#define DS2760_ACTIVE_EMPTY 0x3b