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Commit d0e0cd92 authored by Subbaraman Narayanamurthy's avatar Subbaraman Narayanamurthy
Browse files

power: qpnp-fg-gen4: Add support to read battery id from ADC channel 



Add support to read battery id from ADC channel if specified with
batt_id name under FG device. Also, add a property to specify the
pull up resistor value.

Change-Id: I9486e639e411e9954d8cfd20d7ade4760b3cd2f6
Signed-off-by: default avatarSubbaraman Narayanamurthy <subbaram@codeaurora.org>
parent e59d2258

drivers/power/supply/qcom/qpnp-fg-gen4.c

+56 −0
Original line number Diff line number Diff line
@@ -13,6 +13,7 @@ 
#include <linux/of_platform.h>

#include <linux/of_batterydata.h>

#include <linux/platform_device.h>

#include <linux/iio/consumer.h>

#include <linux/qpnp/qpnp-revid.h>

#include <linux/thermal.h>

#include "fg-core.h"
@@ -220,6 +221,7 @@ struct fg_dt_props { 
	int	delta_esr_disable_count;

	int	delta_esr_thr_uohms;

	int	rconn_uohms;

	int	batt_id_pullup_kohms;

	int	batt_temp_cold_thresh;

	int	batt_temp_hot_thresh;

	int	batt_temp_hyst;
@@ -242,6 +244,7 @@ struct fg_dt_props { 
struct fg_gen4_chip {

	struct fg_dev		fg;

	struct fg_dt_props	dt;

	struct iio_channel	*batt_id_chan;

	struct cycle_counter	*counter;

	struct cap_learning	*cl;

	struct ttf		*ttf;
@@ -546,6 +549,38 @@ struct bias_config id_table[3] = { 
	{0x75, 0x76, 30},

};



#define BID_VREF_MV	1875

static int fg_get_batt_id_adc(struct fg_gen4_chip *chip, u32 *batt_id_ohms)

{

	int rc, batt_id_mv;

	int64_t denom;



	rc = iio_read_channel_processed(chip->batt_id_chan, &batt_id_mv);

	if (rc < 0) {

		pr_err("Error in reading batt_id channel, rc=%d\n", rc);

		return rc;

	}



	batt_id_mv = div_s64(batt_id_mv, 1000);

	if (batt_id_mv == 0) {

		pr_debug("batt_id_mv = 0 from ADC\n");

		return 0;

	}



	denom = div64_s64(BID_VREF_MV * 1000, batt_id_mv) - 1000;

	if (denom <= 0) {

		/* batt id connector might be open, return 0 kohms */

		return 0;

	}



	*batt_id_ohms = div64_u64(chip->dt.batt_id_pullup_kohms * 1000 * 1000

					+ denom / 2, denom);



	pr_debug("batt_id_mv=%d, batt_id_ohms=%d\n", batt_id_mv, *batt_id_ohms);



	return 0;

}



#define MAX_BIAS_CODE	0x70E4

static int fg_gen4_get_batt_id(struct fg_gen4_chip *chip)

{
@@ -554,6 +589,9 @@ static int fg_gen4_get_batt_id(struct fg_gen4_chip *chip) 
	u16 tmp = 0, bias_code = 0, delta = 0;

	u8 val, bias_id = 0;



	if (chip->batt_id_chan)

		return fg_get_batt_id_adc(chip, &fg->batt_id_ohms);



	for (i = 0; i < ARRAY_SIZE(id_table); i++)  {

		rc = fg_read(fg, fg->rradc_base + id_table[i].status_reg, &val,

				1);
@@ -5427,6 +5465,7 @@ static int fg_gen4_parse_child_nodes_dt(struct fg_gen4_chip *chip) 
#define DEFAULT_ESR_MEAS_CURR_MA	120

#define DEFAULT_SCALE_VBATT_THR_MV	3400

#define DEFAULT_SCALE_ALARM_TIMER_MS	10000

#define DEFAULT_BATT_ID_PULLUP_KOHMS	100



static int fg_gen4_parse_dt(struct fg_gen4_chip *chip)

{
@@ -5448,6 +5487,19 @@ static int fg_gen4_parse_dt(struct fg_gen4_chip *chip) 
	if (rc < 0)

		return rc;



	rc = of_property_match_string(fg->dev->of_node, "io-channel-names",

					"batt_id");

	if (rc >= 0) {

		chip->batt_id_chan = devm_iio_channel_get(fg->dev, "batt_id");

		if (IS_ERR(chip->batt_id_chan)) {

			rc = PTR_ERR(chip->batt_id_chan);

			if (rc != -EPROBE_DEFER)

				pr_err("Couldn't get batt_id_chan rc=%d\n", rc);

			chip->batt_id_chan = NULL;

			return rc;

		}

	}



	rc = fg_gen4_parse_child_nodes_dt(chip);

	if (rc < 0)

		return rc;
@@ -5575,6 +5627,10 @@ static int fg_gen4_parse_dt(struct fg_gen4_chip *chip) 
	chip->dt.sys_min_volt_mv = DEFAULT_SYS_MIN_VOLT_MV;

	of_property_read_u32(node, "qcom,fg-sys-min-voltage",

				&chip->dt.sys_min_volt_mv);



	chip->dt.batt_id_pullup_kohms = DEFAULT_BATT_ID_PULLUP_KOHMS;

	of_property_read_u32(node, "qcom,batt-id-pullup-kohms",

				&chip->dt.batt_id_pullup_kohms);

	return 0;

}