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Commit ca522f42 authored by Zhenhua Huang's avatar Zhenhua Huang Committed by Abhijeet Dharmapurikar
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power: smb135x-charger: Add interface for gamma programming 



Gamma value is used to adjust JEITA temperature thresholds.
Add an interface for dynamic programming it.

Change-Id: I9d661d5eed51ff275354e643cb06ffe1d51c62a8
Signed-off-by: default avatarZhenhua Huang <zhenhuah@codeaurora.org>
parent e06552d5

drivers/power/smb135x-charger.c

+60 −0
Original line number Diff line number Diff line
@@ -115,6 +115,16 @@ 
#define HOT_SOFT_CURRENT_COMP_EN_BIT	BIT(1)

#define COLD_SOFT_CURRENT_COMP_EN_BIT	BIT(0)



#define CFG_1B_REG			0x1B

#define COLD_HARD_MASK			SMB135X_MASK(7, 6)

#define COLD_HARD_SHIFT			6

#define HOT_HARD_MASK			SMB135X_MASK(5, 4)

#define HOT_HARD_SHIFT			4

#define COLD_SOFT_MASK			SMB135X_MASK(3, 2)

#define COLD_SOFT_SHIFT			2

#define HOT_SOFT_MASK			SMB135X_MASK(1, 0)

#define HOT_SOFT_SHIFT			0



#define VFLOAT_REG			0x1E



#define VERSION1_REG			0x2A
@@ -394,6 +404,8 @@ struct smb135x_chg { 
	unsigned int			thermal_levels;

	unsigned int			therm_lvl_sel;

	unsigned int			*thermal_mitigation;

	unsigned int			gamma_setting_num;

	unsigned int			*gamma_setting;

	struct mutex			current_change_lock;



	const char			*pinctrl_state_name;
@@ -3574,6 +3586,22 @@ static int smb135x_hw_init(struct smb135x_chg *chip) 
		}

	}



	if (chip->gamma_setting) {

		rc = smb135x_masked_write(chip, CFG_1B_REG, COLD_HARD_MASK,

				chip->gamma_setting[0] << COLD_HARD_SHIFT);



		rc |= smb135x_masked_write(chip, CFG_1B_REG, HOT_HARD_MASK,

				chip->gamma_setting[1] << HOT_HARD_SHIFT);



		rc |= smb135x_masked_write(chip, CFG_1B_REG, COLD_SOFT_MASK,

				chip->gamma_setting[2] << COLD_SOFT_SHIFT);



		rc |= smb135x_masked_write(chip, CFG_1B_REG, HOT_SOFT_MASK,

				chip->gamma_setting[3] << HOT_SOFT_SHIFT);

		if (rc < 0)

			goto free_regulator;

	}



	__smb135x_charging(chip, chip->chg_enabled);



	/* interrupt enabling - active low */
@@ -3701,6 +3729,7 @@ static struct of_device_id smb135x_match_table[] = { 


#define DC_MA_MIN 300

#define DC_MA_MAX 2000

#define NUM_GAMMA_VALUES 4

static int smb_parse_dt(struct smb135x_chg *chip)

{

	int rc;
@@ -3802,6 +3831,37 @@ static int smb_parse_dt(struct smb135x_chg *chip) 
			return PTR_ERR(chip->therm_bias_vreg);

	}



	/*

	 * Gamma value indicates the ratio of the pull up resistors and NTC

	 * resistor in battery pack. There are 4 options, refer to the graphic

	 * user interface and choose the right one.

	 */

	if (of_find_property(node, "qcom,gamma-setting",

					&chip->gamma_setting_num)) {

		chip->gamma_setting_num = chip->gamma_setting_num /

					sizeof(chip->gamma_setting_num);

		if (NUM_GAMMA_VALUES != chip->gamma_setting_num) {

			pr_err("Gamma setting not correct!\n");

			return -EINVAL;

		}



		chip->gamma_setting = devm_kzalloc(chip->dev,

			chip->gamma_setting_num *

				sizeof(chip->gamma_setting_num), GFP_KERNEL);

		if (!chip->gamma_setting) {

			pr_err("gamma setting kzalloc failed!\n");

			return -ENOMEM;

		}



		rc = of_property_read_u32_array(node,

					"qcom,gamma-setting",

				chip->gamma_setting, chip->gamma_setting_num);

		if (rc) {

			pr_err("Couldn't read gamma setting, rc = %d\n", rc);

			return rc;

		}

	}



	if (of_find_property(node, "qcom,thermal-mitigation",

					&chip->thermal_levels)) {

		chip->thermal_mitigation = devm_kzalloc(chip->dev,