Commit 40b1445b authored by Shreshtha Kumar Sahu's avatar Shreshtha Kumar Sahu Committed by Linus Torvalds
Browse files

arch/arm/mach-ux500/board-u5500.c: calibrate ALS input voltage 



Provide the support for auto calibration of ALS Zone boundaries based on
min/max ALS input voltage.

Signed-off-by: default avatarShreshtha Kumar Sahu <shreshthakumar.sahu@stericsson.com>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: Lee Jones <lee.jones@linaro.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 2504f6da

drivers/leds/leds-lm3530.c

+53 −14
Original line number Diff line number Diff line
@@ -68,17 +68,16 @@ 
#define LM3530_ALS2_IMP_SHIFT		(4)



/* Zone Boundary Register defaults */

#define LM3530_DEF_ZB_0			(0x33)

#define LM3530_DEF_ZB_1			(0x66)

#define LM3530_DEF_ZB_2			(0x99)

#define LM3530_DEF_ZB_3			(0xCC)

#define LM3530_ALS_ZB_MAX		(4)

#define LM3530_ALS_WINDOW_mV		(1000)

#define LM3530_ALS_OFFSET_mV		(4)



/* Zone Target Register defaults */

#define LM3530_DEF_ZT_0			(0x19)

#define LM3530_DEF_ZT_1			(0x33)

#define LM3530_DEF_ZT_0			(0x7F)

#define LM3530_DEF_ZT_1			(0x66)

#define LM3530_DEF_ZT_2			(0x4C)

#define LM3530_DEF_ZT_3			(0x66)

#define LM3530_DEF_ZT_4			(0x7F)

#define LM3530_DEF_ZT_3			(0x33)

#define LM3530_DEF_ZT_4			(0x19)



struct lm3530_mode_map {

	const char *mode;
@@ -150,6 +149,8 @@ static int lm3530_init_registers(struct lm3530_data *drvdata) 
	u8 als_imp_sel = 0;

	u8 brightness;

	u8 reg_val[LM3530_REG_MAX];

	u8 zones[LM3530_ALS_ZB_MAX];

	u32 als_vmin, als_vmax, als_vstep;

	struct lm3530_platform_data *pltfm = drvdata->pdata;

	struct i2c_client *client = drvdata->client;
@@ -161,6 +162,26 @@ static int lm3530_init_registers(struct lm3530_data *drvdata) 
		gen_config |= (LM3530_ENABLE_I2C);



	if (drvdata->mode == LM3530_BL_MODE_ALS) {

		if (pltfm->als_vmax == 0) {

			pltfm->als_vmin = als_vmin = 0;

			pltfm->als_vmin = als_vmax = LM3530_ALS_WINDOW_mV;

		}



		als_vmin = pltfm->als_vmin;

		als_vmax = pltfm->als_vmax;



		if ((als_vmax - als_vmin) > LM3530_ALS_WINDOW_mV)

			pltfm->als_vmax = als_vmax =

				als_vmin + LM3530_ALS_WINDOW_mV;



		/* n zone boundary makes n+1 zones */

		als_vstep = (als_vmax - als_vmin) / (LM3530_ALS_ZB_MAX + 1);



		for (i = 0; i < LM3530_ALS_ZB_MAX; i++)

			zones[i] = (((als_vmin + LM3530_ALS_OFFSET_mV) +

					als_vstep + (i * als_vstep)) * LED_FULL)

					/ 1000;



		als_config =

			(pltfm->als_avrg_time << LM3530_ALS_AVG_TIME_SHIFT) |

			(LM3530_ENABLE_ALS) |
@@ -169,6 +190,7 @@ static int lm3530_init_registers(struct lm3530_data *drvdata) 
		als_imp_sel =

			(pltfm->als1_resistor_sel << LM3530_ALS1_IMP_SHIFT) |

			(pltfm->als2_resistor_sel << LM3530_ALS2_IMP_SHIFT);



	}



	if (drvdata->mode == LM3530_BL_MODE_PWM)
@@ -190,10 +212,10 @@ static int lm3530_init_registers(struct lm3530_data *drvdata) 
	reg_val[3] = 0x00;		/* LM3530_ALS_ZONE_REG */

	reg_val[4] = als_imp_sel;	/* LM3530_ALS_IMP_SELECT */

	reg_val[5] = brightness;	/* LM3530_BRT_CTRL_REG */

	reg_val[6] = LM3530_DEF_ZB_0;	/* LM3530_ALS_ZB0_REG */

	reg_val[7] = LM3530_DEF_ZB_1;	/* LM3530_ALS_ZB1_REG */

	reg_val[8] = LM3530_DEF_ZB_2;	/* LM3530_ALS_ZB2_REG */

	reg_val[9] = LM3530_DEF_ZB_3;	/* LM3530_ALS_ZB3_REG */

	reg_val[6] = zones[0];		/* LM3530_ALS_ZB0_REG */

	reg_val[7] = zones[1];		/* LM3530_ALS_ZB1_REG */

	reg_val[8] = zones[2];		/* LM3530_ALS_ZB2_REG */

	reg_val[9] = zones[3];		/* LM3530_ALS_ZB3_REG */

	reg_val[10] = LM3530_DEF_ZT_0;	/* LM3530_ALS_Z0T_REG */

	reg_val[11] = LM3530_DEF_ZT_1;	/* LM3530_ALS_Z1T_REG */

	reg_val[12] = LM3530_DEF_ZT_2;	/* LM3530_ALS_Z2T_REG */
@@ -265,6 +287,24 @@ static void lm3530_brightness_set(struct led_classdev *led_cdev, 
	}

}



static ssize_t lm3530_mode_get(struct device *dev,

		struct device_attribute *attr, char *buf)

{

	struct i2c_client *client = container_of(

					dev->parent, struct i2c_client, dev);

	struct lm3530_data *drvdata = i2c_get_clientdata(client);

	int i, len = 0;



	for (i = 0; i < ARRAY_SIZE(mode_map); i++)

		if (drvdata->mode == mode_map[i].mode_val)

			len += sprintf(buf + len, "[%s] ", mode_map[i].mode);

		else

			len += sprintf(buf + len, "%s ", mode_map[i].mode);



	len += sprintf(buf + len, "\n");



	return len;

}



static ssize_t lm3530_mode_set(struct device *dev, struct device_attribute

				   *attr, const char *buf, size_t size)
@@ -298,8 +338,7 @@ static ssize_t lm3530_mode_set(struct device *dev, struct device_attribute 


	return sizeof(drvdata->mode);

}



static DEVICE_ATTR(mode, 0644, NULL, lm3530_mode_set);

static DEVICE_ATTR(mode, 0644, lm3530_mode_get, lm3530_mode_set);



static int __devinit lm3530_probe(struct i2c_client *client,

			   const struct i2c_device_id *id)

include/linux/led-lm3530.h

+5 −0
Original line number Diff line number Diff line
@@ -84,6 +84,8 @@ enum lm3530_als_mode { 
 * @brt_ramp_rise: rate of rise of led current

 * @als1_resistor_sel: internal resistance from ALS1 input to ground

 * @als2_resistor_sel: internal resistance from ALS2 input to ground

 * @als_vmin: als input voltage calibrated for max brightness in mV

 * @als_vmax: als input voltage calibrated for min brightness in mV

 * @brt_val: brightness value (0-255)

 */

struct lm3530_platform_data {
@@ -101,6 +103,9 @@ struct lm3530_platform_data { 
	u8 als1_resistor_sel;

	u8 als2_resistor_sel;



	u32 als_vmin;

	u32 als_vmax;



	u8 brt_val;

};

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