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Commit b9d97ff9 authored by Oliver Wang's avatar Oliver Wang
Browse files

input: sensors: calibrate LTR553 for msm8909 SKUE 



LTR553 output data is not accurate. Calibrate LTR553 for msm8909
SKUE.

Change-Id: Ie88bba86844ec24e53c08261ce7e5a3e9e7122e9
Signed-off-by: default avatarOliver Wang <mengmeng@codeaurora.org>
parent e6e3e7ae

drivers/input/misc/ltr553.c

+19 −22
Original line number Diff line number Diff line
@@ -172,12 +172,12 @@ struct ltr553_data { 
};



struct als_coeff {

	u32 ch0_coeff_i;

	u32 ch1_coeff_i;

	u32 ch0_coeff_f;

	u32 ch1_coeff_f;

	u32 win_fac;

	u32 sign;

	int ch0_coeff_i;

	int ch1_coeff_i;

	int ch0_coeff_f;

	int ch1_coeff_f;

	int win_fac;

	int sign;

} __attribute__((__packed__));



static struct regulator_map power_config[] = {
@@ -195,23 +195,23 @@ static struct als_coeff eqtn_map[] = { 
		.ch1_coeff_i = 1,

		.ch0_coeff_f = 7743,

		.ch1_coeff_f = 1059,

		.win_fac = 100,

		.win_fac = 44,

		.sign = 1,

	},

	{

		.ch0_coeff_i = 4,

		.ch1_coeff_i = 1,

		.ch0_coeff_f = 2785,

		.ch1_coeff_f = 696,

		.win_fac = 80,

		.ch1_coeff_f = 9548,

		.win_fac = 50,

		.sign = -1,

	},

	{

		.ch0_coeff_i = 0,

		.ch1_coeff_i = 0,

		.ch0_coeff_f = 5926,

		.ch1_coeff_f = 1300,

		.win_fac = 44,

		.ch1_coeff_f = 1185,

		.win_fac = 40,

		.sign = 1,

	},

	{
@@ -679,8 +679,7 @@ static int ltr553_init_device(struct ltr553_data *ltr) 
}



/* Calculate the lux value based on ADC data */

static int ltr553_calc_lux(int ch0data, int ch1data, int gain,

		unsigned int als_int_fac)

static int ltr553_calc_lux(int ch0data, int ch1data, int gain, int als_int_fac)

{

	int ratio;

	int lux_i;
@@ -695,9 +694,9 @@ static int ltr553_calc_lux(int ch0data, int ch1data, int gain, 
	ratio = ch1data * 100 / (ch0data + ch1data);

	if (ratio < 45)

		eqtn = &eqtn_map[0];

	else if ((ratio >= 45) && (ratio < 74))

	else if ((ratio >= 45) && (ratio < 68))

		eqtn = &eqtn_map[1];

	else if ((ratio >= 74) && (ratio < 99))

	else if ((ratio >= 68) && (ratio < 99))

		eqtn = &eqtn_map[2];

	else

		eqtn = &eqtn_map[3];
@@ -713,8 +712,7 @@ static int ltr553_calc_lux(int ch0data, int ch1data, int gain, 
}



/* Calculate adc value based on lux. Return value is positive */

static int ltr553_calc_adc(int ratio, int lux, int gain,

		unsigned int als_int_fac)

static int ltr553_calc_adc(int ratio, int lux, int gain, int als_int_fac)

{

	int divisor_i;

	int divisor_f;
@@ -752,8 +750,7 @@ static int ltr553_calc_adc(int ratio, int lux, int gain, 


/* update als gain and threshold */

static int ltr553_als_update_setting(struct ltr553_data *ltr,

		unsigned int ch0data, unsigned int ch1data,

		unsigned int als_int_fac)

		int ch0data, int ch1data, int als_int_fac)

{

	int gain_index;

	unsigned int config;
@@ -869,15 +866,15 @@ static int ltr553_als_update_setting(struct ltr553_data *ltr, 


static int ltr553_process_data(struct ltr553_data *ltr, int als_ps)

{

	unsigned int als_int_fac;

	int als_int_fac;

	ktime_t	timestamp;

	int rc = 0;



	unsigned int tmp;

	u8 als_data[4];

	int lux;

	unsigned int ch0data;

	unsigned int ch1data;

	int ch0data;

	int ch1data;



	u8 ps_data[4];

	int i;