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Commit ea8cd32a authored by Siddartha Mohanadoss's avatar Siddartha Mohanadoss
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thermal: qpnp-adc-tm: Add reverse scaling 



Add reverse scaling to convert voltage in uV using absolute
calibration to raw ADC code written to set high/low threshold
for a specified BTM channel.

Change-Id: Ic56465df5ab60100cffe4303ff983480b71c0c95
Signed-off-by: default avatarSiddartha Mohanadoss <smohanad@codeaurora.org>
parent bc45092a

Documentation/devicetree/bindings/thermal/qpnp-adc-tm.txt

+11 −8
Original line number Diff line number Diff line
@@ -69,14 +69,16 @@ Required properties: 
			  Select from the following strings.

			  "absolute" : Uses the 625mv and 1.25V reference channels.

			  "ratiometric" : Uses the reference Voltage/GND for calibration.

- qcom,scale-function : Scaling fuction used to convert raw ADC code to units specific to

- qcom,scale-function : Reverse scaling fuction used to convert raw ADC code to units specific to

			a given channel.

			Select from the following unsigned int.

			0 : Default scaling to convert raw adc code to voltage.

			1 : Conversion to temperature based on btm parameters.

			2 : Returns result in milli degree's Centigrade.

			3 : Returns current across 0.1 ohm resistor.

			4 : Returns XO thermistor voltage in degree's Centigrade.

			0 : Scaling to convert voltage in uV to raw adc code.

			1 : Scaling to convert decidegC to raw adc code.

			2 : Scaling for converting USB_ID reverse scaling.

			3 : Scaling to convert milldegC to raw ADC code.

			4 : Scaling to convert smb_batt_therm values to raw ADC code.

			5 : Scaling to perform reverse calibration for absolute voltage from uV

			    to raw ADC code.

- qcom,hw-settle-time : Settling period for the channel before ADC read.

			Select from the following unsigned int.

			0 : 0us
@@ -108,8 +110,9 @@ Required properties: 
			6 : 64

			7 : 128

			8 : 256

- qcom,btm-channel-number : There are 5 BTM channels. The BTM channel numbers are statically

			    allocated to the corresponding channel node.

- qcom,btm-channel-number : Depending on the PMIC version, a max of upto 8 BTM channels.

			    The BTM channel numbers are statically allocated to the

			    corresponding channel node.

- qcom,adc_tm-vadc : phandle to the corresponding VADC device to read the ADC channels.



Client device example:

drivers/hwmon/qpnp-adc-common.c

+41 −0
Original line number Diff line number Diff line
@@ -1028,6 +1028,47 @@ int32_t qpnp_adc_vbatt_rscaler(struct qpnp_vadc_chip *chip, 
}

EXPORT_SYMBOL(qpnp_adc_vbatt_rscaler);



int32_t qpnp_adc_absolute_rthr(struct qpnp_vadc_chip *chip,

		struct qpnp_adc_tm_btm_param *param,

		uint32_t *low_threshold, uint32_t *high_threshold)

{

	struct qpnp_vadc_linear_graph vbatt_param;

	int rc = 0, sign = 0;

	int64_t low_thr = 0, high_thr = 0;



	rc = qpnp_get_vadc_gain_and_offset(chip, &vbatt_param, CALIB_ABSOLUTE);

	if (rc < 0)

		return rc;



	low_thr = (((param->low_thr) - QPNP_ADC_625_UV) * vbatt_param.dy);

	if (low_thr < 0) {

		sign = 1;

		low_thr = -low_thr;

	}

	do_div(low_thr, QPNP_ADC_625_UV);

	if (sign)

		low_thr = -low_thr;

	*low_threshold = low_thr + vbatt_param.adc_gnd;



	sign = 0;

	high_thr = (((param->high_thr) - QPNP_ADC_625_UV) * vbatt_param.dy);

	if (high_thr < 0) {

		sign = 1;

		high_thr = -high_thr;

	}

	do_div(high_thr, QPNP_ADC_625_UV);

	if (sign)

		high_thr = -high_thr;

	*high_threshold = high_thr + vbatt_param.adc_gnd;



	pr_debug("high_volt:%d, low_volt:%d\n", param->high_thr,

				param->low_thr);

	pr_debug("adc_code_high:%x, adc_code_low:%x\n", *high_threshold,

				*low_threshold);

	return 0;

}

EXPORT_SYMBOL(qpnp_adc_absolute_rthr);



int32_t qpnp_adc_btm_scaler(struct qpnp_vadc_chip *chip,

		struct qpnp_adc_tm_btm_param *param,

		uint32_t *low_threshold, uint32_t *high_threshold)

drivers/thermal/qpnp-adc-tm.c

+1 −0
Original line number Diff line number Diff line
@@ -283,6 +283,7 @@ static struct qpnp_adc_tm_reverse_scale_fn adc_tm_rscale_fn[] = { 
	[SCALE_RBATT_THERM] = {qpnp_adc_btm_scaler},

	[SCALE_R_USB_ID] = {qpnp_adc_usb_scaler},

	[SCALE_RPMIC_THERM] = {qpnp_adc_scale_millidegc_pmic_voltage_thr},

	[SCALE_R_ABSOLUTE] = {qpnp_adc_absolute_rthr},

};



static int32_t qpnp_adc_tm_read_reg(struct qpnp_adc_tm_chip *chip,

include/linux/qpnp/qpnp-adc.h

+21 −0
Original line number Diff line number Diff line
@@ -265,6 +265,7 @@ enum qpnp_adc_tm_rscale_fn_type { 
	SCALE_R_USB_ID,

	SCALE_RPMIC_THERM,

	SCALE_R_SMB_BATT_THERM,

	SCALE_R_ABSOLUTE,

	SCALE_RSCALE_NONE,

};
@@ -1381,6 +1382,22 @@ int32_t qpnp_adc_usb_scaler(struct qpnp_vadc_chip *dev, 
int32_t qpnp_adc_vbatt_rscaler(struct qpnp_vadc_chip *dev,

		struct qpnp_adc_tm_btm_param *param,

		uint32_t *low_threshold, uint32_t *high_threshold);

/**

 * qpnp_adc_absolute_rthr() - Performs reverse calibration on the low/high

 *		voltage threshold values passed by the client.

 *		The function applies absolute calibration on the

 *		voltage values.

 * @dev:	Structure device for qpnp vadc

 * @param:	The input parameters that contain the low/high voltage

 *		threshold values.

 * @low_threshold: The low threshold value that needs to be updated with

 *		the above calibrated voltage value.

 * @high_threshold: The low threshold value that needs to be updated with

 *		the above calibrated voltage value.

 */

int32_t qpnp_adc_absolute_rthr(struct qpnp_vadc_chip *dev,

		struct qpnp_adc_tm_btm_param *param,

		uint32_t *low_threshold, uint32_t *high_threshold);

/**

 * qpnp_vadc_iadc_sync_request() - Performs Voltage ADC read and

 *		locks the peripheral. When performing simultaneous
@@ -1506,6 +1523,10 @@ static inline int32_t qpnp_adc_vbatt_rscaler(struct qpnp_vadc_chip *dev, 
		struct qpnp_adc_tm_btm_param *param,

		uint32_t *low_threshold, uint32_t *high_threshold)

{ return -ENXIO; }

static inline int32_t qpnp_adc_absolute_rthr(struct qpnp_vadc_chip *dev,

		struct qpnp_adc_tm_btm_param *param,

		uint32_t *low_threshold, uint32_t *high_threshold)

{ return -ENXIO; }

static inline int32_t qpnp_adc_btm_scaler(struct qpnp_vadc_chip *dev,

		struct qpnp_adc_tm_btm_param *param,

		uint32_t *low_threshold, uint32_t *high_threshold)