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Commit d5ea6b0d authored by Abhijeet Dharmapurikar's avatar Abhijeet Dharmapurikar
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power: smb135x-charger: Suspend DC Path for Wipower 



DC path needs to be put in suspend when
* power up is from any reason other than device being placed on charge
pad. This can be checked by DCIN present status at probe time.
* when device is removed from the charge pad. This is indicated by
DCIN undervoltage interrupt

Similarly DC path needs to be taken out of suspend when the device is
kept on a charge pad. However, Wipower needs about 1000mS after valid
voltage is seen on DCIN before device can draw power from the charge pad.

Implement code for the above Wipower requirements.

Change-Id: I2bacd160df7deeb7ac8c78c9b36edf96b010d3ee
Signed-off-by: default avatarAbhijeet Dharmapurikar <adharmap@codeaurora.org>
parent 84dce0d6

drivers/power/smb135x-charger.c

+48 −4
Original line number Diff line number Diff line
@@ -271,6 +271,7 @@ struct smb135x_chg { 
	bool				soft_vfloat_comp_disabled;

	struct mutex			irq_complete;

	struct regulator		*therm_bias_vreg;

	struct delayed_work		wireless_insertion_work;

};



static int smb135x_read(struct smb135x_chg *chip, int reg,
@@ -1126,6 +1127,16 @@ static void smb135x_regulator_deinit(struct smb135x_chg *chip) 
		regulator_unregister(chip->otg_vreg.rdev);

}



static void wireless_insertion_work(struct work_struct *work)

{

	struct smb135x_chg *chip =

		container_of(work, struct smb135x_chg,

				wireless_insertion_work.work);



	/* unsuspend dc */

	smb135x_dc_suspend(chip, false);

}



static int hot_hard_handler(struct smb135x_chg *chip, u8 rt_stat)

{

	pr_debug("rt_stat = 0x%02x\n", rt_stat);
@@ -1192,12 +1203,23 @@ static int safety_timeout_handler(struct smb135x_chg *chip, u8 rt_stat) 
}



/**

 * power_ok_handler() - called  when any charger is inserted or removed,

 *		use it to handle dc charger insertion and removal

 * power_ok_handler() - called when the switcher turns on or turns off

 * @chip: pointer to smb135x_chg chip

 * @rt_stat: the status bit indicating chg insertion/removal

 * @rt_stat: the status bit indicating switcher turning on or off

 */

static int power_ok_handler(struct smb135x_chg *chip, u8 rt_stat)

{

	pr_debug("rt_stat = 0x%02x\n", rt_stat);

	return 0;

}



/**

 * dcin_uv_handler() - called when the dc voltage crosses the uv threshold

 * @chip: pointer to smb135x_chg chip

 * @rt_stat: the status bit indicating whether dc voltage is uv

 */

#define DCIN_UNSUSPEND_DELAY_MS		1000

static int dcin_uv_handler(struct smb135x_chg *chip, u8 rt_stat)

{

	bool dc_present = is_dc_present(chip);
@@ -1207,7 +1229,11 @@ static int power_ok_handler(struct smb135x_chg *chip, u8 rt_stat) 
	if (chip->dc_present && !dc_present) {

		/* dc removed */

		chip->dc_present = dc_present;



		if (chip->dc_psy_type == POWER_SUPPLY_TYPE_WIRELESS) {

			cancel_delayed_work_sync(

				&chip->wireless_insertion_work);

			smb135x_dc_suspend(chip, true);

		}

		if (chip->dc_psy_type != -EINVAL)

			power_supply_set_online(&chip->dc_psy,

							chip->dc_present);
@@ -1216,6 +1242,9 @@ static int power_ok_handler(struct smb135x_chg *chip, u8 rt_stat) 
	if (!chip->dc_present && dc_present) {

		/* dc inserted */

		chip->dc_present = dc_present;

		if (chip->dc_psy_type == POWER_SUPPLY_TYPE_WIRELESS)

			schedule_delayed_work(&chip->wireless_insertion_work,

				msecs_to_jiffies(DCIN_UNSUSPEND_DELAY_MS));

		if (chip->dc_psy_type != -EINVAL)

			power_supply_set_online(&chip->dc_psy,

							chip->dc_present);
@@ -1404,6 +1433,7 @@ static struct irq_handler_info handlers[] = { 
			},

			{

				.name		= "dcin_uv",

				.smb_irq	= dcin_uv_handler,

			},

			{

				.name		= "dcin_ov",
@@ -1825,6 +1855,18 @@ static int determine_initial_status(struct smb135x_chg *chip) 
	else

		handle_usb_removal(chip);



	if (chip->dc_psy_type != -EINVAL) {

		if (chip->dc_psy_type == POWER_SUPPLY_TYPE_WIRELESS) {

			/*

			 * put the dc path in suspend state if it is powered

			 * by wireless charger

			 */

			if (chip->dc_present)

				smb135x_dc_suspend(chip, false);

			else

				smb135x_dc_suspend(chip, true);

		}

	}

	return 0;

}
@@ -2243,6 +2285,8 @@ static int smb135x_charger_probe(struct i2c_client *client, 
	chip->usb_psy = usb_psy;

	chip->fake_battery_soc = -EINVAL;



	INIT_DELAYED_WORK(&chip->wireless_insertion_work,

					wireless_insertion_work);

	/* probe the device to check if its actually connected */

	rc = smb135x_read(chip, CFG_4_REG, &reg);

	if (rc) {