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Commit 52e423da authored by Chunmei Cai's avatar Chunmei Cai Committed by Gerrit - the friendly Code Review server
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power: qpnp-linear-charger: Add an led device controlled by LBC 



Register an led device controlled by linear battery charger (LBC).
It can be used as a red indication led as well as a charging led.

Change-Id: I1ceb8af000ffdab0a2e1da3d3344487be5509678
Signed-off-by: default avatarChunmei Cai <ccai@codeaurora.org>
parent 502b33f8

Documentation/devicetree/bindings/power/qpnp-linear-charger.txt

+4 −0
Original line number Diff line number Diff line
@@ -93,6 +93,10 @@ Parent node optional properties: 
					BPD and disables BTC. Declare this node

					only if you are using an external charger

					and not the PMIC internal LBC.

- qcom,chgr-led-support			There is a current sink device in linear

					charger module, it is used to control a

					led which can act as a charger led as well

					as a general notification led.



Sub node required structure:

- A qcom,charger node must be a child of an SPMI node that has specified

drivers/power/qpnp-linear-charger.c

+80 −0
Original line number Diff line number Diff line
@@ -23,6 +23,7 @@ 
#include <linux/qpnp/qpnp-adc.h>

#include <linux/alarmtimer.h>

#include <linux/bitops.h>

#include <linux/leds.h>



#define CREATE_MASK(NUM_BITS, POS) \

	((unsigned char) (((1 << (NUM_BITS)) - 1) << (POS)))
@@ -267,6 +268,7 @@ struct vddtrim_map vddtrim_map[] = { 
 * @cfg_charger_detect_eoc:	charger can detect end of charging

 * @cfg_disable_vbatdet_based_recharge:	keep VBATDET comparator overriden to

 *				low and VBATDET irq disabled.

 * @cfg_chgr_led_support:	support charger led work.

 * @cfg_safe_current:		battery safety current setting

 * @cfg_hot_batt_p:		hot battery threshold setting

 * @cfg_cold_batt_p:		eold battery threshold setting
@@ -317,6 +319,7 @@ struct qpnp_lbc_chip { 
	bool				cfg_use_fake_battery;

	bool				fastchg_on;

	bool				cfg_use_external_charger;

	bool				cfg_chgr_led_support;

	unsigned int			cfg_warm_bat_chg_ma;

	unsigned int			cfg_cool_bat_chg_ma;

	unsigned int			cfg_safe_voltage_mv;
@@ -361,6 +364,7 @@ struct qpnp_lbc_chip { 
	struct qpnp_adc_tm_btm_param	adc_param;

	struct qpnp_vadc_chip		*vadc_dev;

	struct qpnp_adc_tm_chip		*adc_tm_dev;

	struct led_classdev		led_cdev;

};



static void qpnp_lbc_enable_irq(struct qpnp_lbc_chip *chip,
@@ -971,6 +975,68 @@ static int qpnp_lbc_tchg_max_set(struct qpnp_lbc_chip *chip, int minutes) 
	return rc;

}



#define LBC_CHGR_LED	0x4D

#define CHGR_LED_ON	BIT(0)

#define CHGR_LED_OFF	0x0

#define CHGR_LED_STAT_MASK	LBC_MASK(1, 0)

static void qpnp_lbc_chgr_led_brightness_set(struct led_classdev *cdev,

		enum led_brightness value)

{

	struct qpnp_lbc_chip *chip = container_of(cdev, struct qpnp_lbc_chip,

			led_cdev);

	u8 reg;

	int rc;



	if (value > LED_FULL)

		value = LED_FULL;



	pr_debug("set the charger led brightness to value=%d\n", value);

	reg = (value > LED_OFF) ? CHGR_LED_ON : CHGR_LED_OFF;



	rc = qpnp_lbc_masked_write(chip, chip->chgr_base + LBC_CHGR_LED,

				CHGR_LED_STAT_MASK, reg);

	if (rc)

		pr_err("Failed to write charger led rc=%d\n", rc);

}



static enum

led_brightness qpnp_lbc_chgr_led_brightness_get(struct led_classdev *cdev)

{



	struct qpnp_lbc_chip *chip = container_of(cdev, struct qpnp_lbc_chip,

			led_cdev);

	u8 reg_val, chgr_led_sts;

	int rc;



	rc = qpnp_lbc_read(chip, chip->chgr_base + LBC_CHGR_LED,

				&reg_val, 1);

	if (rc) {

		pr_err("Failed to read charger led rc=%d\n", rc);

		return rc;

	}



	chgr_led_sts = reg_val & CHGR_LED_STAT_MASK;

	pr_debug("charger led brightness chgr_led_sts=%d\n", chgr_led_sts);



	return (chgr_led_sts == CHGR_LED_ON) ? LED_FULL : LED_OFF;

}



static int qpnp_lbc_register_chgr_led(struct qpnp_lbc_chip *chip)

{

	int rc;



	chip->led_cdev.name = "red";

	chip->led_cdev.brightness_set = qpnp_lbc_chgr_led_brightness_set;

	chip->led_cdev.brightness_get = qpnp_lbc_chgr_led_brightness_get;



	rc = led_classdev_register(chip->dev, &chip->led_cdev);

	if (rc)

		dev_err(chip->dev, "unable to register charger led, rc=%d\n",

				rc);



	return rc;

};



static int qpnp_lbc_vbatdet_override(struct qpnp_lbc_chip *chip, int ovr_val)

{

	int rc;
@@ -1941,6 +2007,12 @@ static int qpnp_charger_read_dt_props(struct qpnp_lbc_chip *chip) 
	chip->cfg_disable_vbatdet_based_recharge =

			of_property_read_bool(chip->spmi->dev.of_node,

					"qcom,disable-vbatdet-based-recharge");



	/* Get the charger led support property */

	chip->cfg_chgr_led_support =

			of_property_read_bool(chip->spmi->dev.of_node,

					"qcom,chgr-led-support");



	/* Disable charging when faking battery values */

	if (chip->cfg_use_fake_battery)

		chip->cfg_charging_disabled = true;
@@ -2563,6 +2635,14 @@ static int qpnp_lbc_probe(struct spmi_device *spmi) 
		return rc;

	}



	if (chip->cfg_chgr_led_support) {

		rc = qpnp_lbc_register_chgr_led(chip);

		if (rc) {

			pr_err("unable to register charger led rc=%d\n", rc);

			return rc;

		}

	}



	if (chip->bat_if_base) {

		chip->batt_present = qpnp_lbc_is_batt_present(chip);

		chip->batt_psy.name = "battery";