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Commit 890f37bb authored by Anirudh Ghayal's avatar Anirudh Ghayal Committed by Gerrit - the friendly Code Review server
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power: smb1360: Add DT properties to configure FG parameters 



Add 3 DT properties to configure the FG parameters

Cutoff Voltage: System voltage at which FG reports SOC = 0
FG Iterm: Termination current at which FG reports SOC = 100
FG Ibatt Standby: Standby current to adapt SOC at cutoff-voltage
at low temperatures.

Change-Id: I60723b19eb6ab7a49fb54b199bf31a8ffde2e5d4
Signed-off-by: default avatarAnirudh Ghayal <aghayal@codeaurora.org>
parent d772920d

Documentation/devicetree/bindings/power/smb1360-charger-fg.txt

+15 −1
Original line number Diff line number Diff line
@@ -79,6 +79,16 @@ Optional Properties: 
				is specified. This value is calculated from the

				batt-capacity and then encoded as floating number.

				cc_soc_coeff = HALF_ENCODING(8192 / batt-capacity)

- qcom,fg-cutoff-voltage-mv	This is the minimum allowed system voltage. The

				FG will report SOC = 0 at this volatge. This

				value is in mv.

- qcom,fg-iterm-ma		This is termination current at which the

				Monotonic SOC reports 100. The value passed here

				is negated in the driver (assuming that the iterm

				is always -ve). This value is in mA.

- qcom,fg-ibatt-standby-ma	This is the minimum current value for the SOC to

				be above 0% at the cutoff voltage. This value

				is in mA.



Example:

	i2c@f9967000 {
@@ -100,7 +110,11 @@ Example: 


			/* battery capacity */

			qcom,fg-batt-capacity-mah = <4000>;

			qcom,fg-cc-soc-coeff = <0x8009>

			qcom,fg-cc-soc-coeff = <0x8009>;



			qcom,fg-cutoff-voltage-mv = <3300>;

			qcom,fg-iterm-ma = <100>;

			qcom,fg-ibatt-standby-ma = <200>;



			qcom,float-voltage-mv = <4200>;

			qcom,iterm-ma = <100>;

drivers/power/smb1360-charger-fg.c

+105 −27
Original line number Diff line number Diff line
@@ -199,6 +199,9 @@ 


#define CC_TO_SOC_COEFF			0xBA

#define ACTUAL_CAPACITY_REG		0xBE

#define FG_SYS_CUTOFF_V_REG		0xD3

#define FG_ITERM_REG			0xD9

#define FG_IBATT_STANDBY_REG		0xCF



#define FG_I2C_CFG_MASK			SMB1360_MASK(2, 1)

#define FG_CFG_I2C_ADDR			0x2
@@ -272,6 +275,9 @@ struct smb1360_chip { 
	int				voltage_empty_mv;

	int				batt_capacity_mah;

	int				cc_soc_coeff;

	int				v_cutoff_mv;

	int				fg_iterm_ma;

	int				fg_ibatt_standby_ma;



	/* status tracking */

	bool				usb_present;
@@ -2512,29 +2518,36 @@ static int smb1360_fg_config(struct smb1360_chip *chip) 
	}



	/* scratch-pad register config */

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

	if (chip->batt_capacity_mah != -EINVAL

		|| chip->v_cutoff_mv != -EINVAL

		|| chip->fg_iterm_ma != -EINVAL

		|| chip->fg_ibatt_standby_ma != -EINVAL) {



		rc = smb1360_enable_fg_access(chip);

		if (rc) {

			pr_err("Couldn't enable FG access rc=%d\n", rc);

			return rc;

		}



		/* Update battery capacity */

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

			rc = smb1360_read_bytes(chip, ACTUAL_CAPACITY_REG,

								reg2, 2);

			if (rc) {

			pr_err("Failed to read NOM CAPACITY rc=%d\n",

				pr_err("Failed to read ACTUAL CAPACITY rc=%d\n",

									rc);

				goto disable_fg;

			}

			fcc_mah = (reg2[1] << 8) | reg2[0];

			if (fcc_mah == chip->batt_capacity_mah) {

				pr_debug("battery capacity correct\n");

			goto disable_fg;

		}

			} else {

				/* Update the battery capacity */

		reg2[1] = (chip->batt_capacity_mah & 0xFF00) >> 8;

				reg2[1] =

					(chip->batt_capacity_mah & 0xFF00) >> 8;

				reg2[0] = (chip->batt_capacity_mah & 0xFF);

		rc = smb1360_write_bytes(chip, ACTUAL_CAPACITY_REG,

							reg2, 2);

				rc = smb1360_write_bytes(chip,

					ACTUAL_CAPACITY_REG, reg2, 2);

				if (rc) {

					pr_err("Couldn't write batt-capacity rc=%d\n",

									rc);
@@ -2542,16 +2555,66 @@ static int smb1360_fg_config(struct smb1360_chip *chip) 
				}

				/* Update CC to SOC COEFF */

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

			reg2[1] = (chip->cc_soc_coeff & 0xFF00) >> 8;

					reg2[1] =

					(chip->cc_soc_coeff & 0xFF00) >> 8;

					reg2[0] = (chip->cc_soc_coeff & 0xFF);

			rc = smb1360_write_bytes(chip, CC_TO_SOC_COEFF,

							reg2, 2);

					rc = smb1360_write_bytes(chip,

						CC_TO_SOC_COEFF, reg2, 2);

					if (rc) {

						pr_err("Couldn't write cc_soc_coeff rc=%d\n",

									rc);

						goto disable_fg;

					}

				}

			}

		}



		/* Update cutoff voltage for SOC = 0 */

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

			temp = (u16) div_u64(chip->v_cutoff_mv * 0x7FFF, 5000);

			reg2[1] = (temp & 0xFF00) >> 8;

			reg2[0] = temp & 0xFF;

			rc = smb1360_write_bytes(chip, FG_SYS_CUTOFF_V_REG,

								reg2, 2);

			if (rc) {

				pr_err("Couldn't write cutoff_mv rc=%d\n", rc);

				goto disable_fg;

			}

		}



		/*

		 * Update FG iterm for SOC = 100, this value is always assumed

		 * to be -ve

		 */

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

			int iterm = chip->fg_iterm_ma * -1;

			temp = (s16) div_s64(iterm * 0x7FFF, 2500);

			reg2[1] = (temp & 0xFF00) >> 8;

			reg2[0] = temp & 0xFF;

			rc = smb1360_write_bytes(chip, FG_ITERM_REG,

							reg2, 2);

			if (rc) {

				pr_err("Couldn't write fg_iterm rc=%d\n", rc);

				goto disable_fg;

			}

		}



		/*

		 * Update FG iterm standby for SOC = 0, this value is always

		 * assumed to be +ve

		 */

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

			int iterm = chip->fg_ibatt_standby_ma;

			temp = (u16) div_u64(iterm * 0x7FFF, 2500);

			reg2[1] = (temp & 0xFF00) >> 8;

			reg2[0] = temp & 0xFF;

			rc = smb1360_write_bytes(chip, FG_IBATT_STANDBY_REG,

								reg2, 2);

			if (rc) {

				pr_err("Couldn't write fg_iterm rc=%d\n", rc);

				goto disable_fg;

			}

		}

disable_fg:

		/* disable FG access */

		smb1360_disable_fg_access(chip);
@@ -3091,6 +3154,21 @@ static int smb_parse_dt(struct smb1360_chip *chip) 
	if (rc < 0)

		chip->cc_soc_coeff = -EINVAL;



	rc = of_property_read_u32(node, "qcom,fg-cutoff-voltage-mv",

						&chip->v_cutoff_mv);

	if (rc < 0)

		chip->v_cutoff_mv = -EINVAL;



	rc = of_property_read_u32(node, "qcom,fg-iterm-ma",

					&chip->fg_iterm_ma);

	if (rc < 0)

		chip->fg_iterm_ma = -EINVAL;



	rc = of_property_read_u32(node, "qcom,fg-ibatt-standby-ma",

					&chip->fg_ibatt_standby_ma);

	if (rc < 0)

		chip->fg_ibatt_standby_ma = -EINVAL;



	return 0;

}