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Commit cef437e3 authored by Daniel Mack's avatar Daniel Mack Committed by Anton Vorontsov
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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: default avatarDaniel Mack <daniel@caiaq.de>
Cc: Szabolcs Gyurko <szabolcs.gyurko@tlt.hu>
Acked-by: default avatarMatt Reimer <mreimer@vpop.net>
Acked-by: default avatarEvgeniy Polyakov <zbr@ioremap.net>
Signed-off-by: default avatarAnton Vorontsov <cbouatmailru@gmail.com>
parent 0b47b570

drivers/power/ds2760_battery.c

+26 −0
Original line number Diff line number Diff line
@@ -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) {

drivers/w1/slaves/w1_ds2760.h

+5 −0
Original line number Diff line number Diff line
@@ -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