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: Shreshtha Kumar Sahu <shreshthakumar.sahu@stericsson.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Cc: Richard Purdie <rpurdie@rpsys.net> Cc: Lee Jones <lee.jones@linaro.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Shreshtha Kumar Sahu
Linus Torvalds
Родитель
2504f6da50
Коммит
40b1445b1b
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@ -68,17 +68,16 @@
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#define LM3530_ALS2_IMP_SHIFT (4)
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/* Zone Boundary Register defaults */
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#define LM3530_DEF_ZB_0 (0x33)
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#define LM3530_DEF_ZB_1 (0x66)
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#define LM3530_DEF_ZB_2 (0x99)
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#define LM3530_DEF_ZB_3 (0xCC)
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#define LM3530_ALS_ZB_MAX (4)
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#define LM3530_ALS_WINDOW_mV (1000)
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#define LM3530_ALS_OFFSET_mV (4)
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/* Zone Target Register defaults */
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#define LM3530_DEF_ZT_0 (0x19)
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#define LM3530_DEF_ZT_1 (0x33)
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#define LM3530_DEF_ZT_0 (0x7F)
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#define LM3530_DEF_ZT_1 (0x66)
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#define LM3530_DEF_ZT_2 (0x4C)
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#define LM3530_DEF_ZT_3 (0x66)
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#define LM3530_DEF_ZT_4 (0x7F)
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#define LM3530_DEF_ZT_3 (0x33)
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#define LM3530_DEF_ZT_4 (0x19)
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struct lm3530_mode_map {
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const char *mode;
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@ -150,6 +149,8 @@ static int lm3530_init_registers(struct lm3530_data *drvdata)
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u8 als_imp_sel = 0;
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u8 brightness;
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u8 reg_val[LM3530_REG_MAX];
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u8 zones[LM3530_ALS_ZB_MAX];
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u32 als_vmin, als_vmax, als_vstep;
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struct lm3530_platform_data *pltfm = drvdata->pdata;
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struct i2c_client *client = drvdata->client;
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@ -161,6 +162,26 @@ static int lm3530_init_registers(struct lm3530_data *drvdata)
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gen_config |= (LM3530_ENABLE_I2C);
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if (drvdata->mode == LM3530_BL_MODE_ALS) {
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if (pltfm->als_vmax == 0) {
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pltfm->als_vmin = als_vmin = 0;
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pltfm->als_vmin = als_vmax = LM3530_ALS_WINDOW_mV;
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}
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als_vmin = pltfm->als_vmin;
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als_vmax = pltfm->als_vmax;
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if ((als_vmax - als_vmin) > LM3530_ALS_WINDOW_mV)
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pltfm->als_vmax = als_vmax =
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als_vmin + LM3530_ALS_WINDOW_mV;
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/* n zone boundary makes n+1 zones */
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als_vstep = (als_vmax - als_vmin) / (LM3530_ALS_ZB_MAX + 1);
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for (i = 0; i < LM3530_ALS_ZB_MAX; i++)
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zones[i] = (((als_vmin + LM3530_ALS_OFFSET_mV) +
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als_vstep + (i * als_vstep)) * LED_FULL)
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/ 1000;
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als_config =
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(pltfm->als_avrg_time << LM3530_ALS_AVG_TIME_SHIFT) |
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(LM3530_ENABLE_ALS) |
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@ -169,6 +190,7 @@ static int lm3530_init_registers(struct lm3530_data *drvdata)
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als_imp_sel =
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(pltfm->als1_resistor_sel << LM3530_ALS1_IMP_SHIFT) |
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(pltfm->als2_resistor_sel << LM3530_ALS2_IMP_SHIFT);
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}
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if (drvdata->mode == LM3530_BL_MODE_PWM)
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@ -190,10 +212,10 @@ static int lm3530_init_registers(struct lm3530_data *drvdata)
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reg_val[3] = 0x00; /* LM3530_ALS_ZONE_REG */
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reg_val[4] = als_imp_sel; /* LM3530_ALS_IMP_SELECT */
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reg_val[5] = brightness; /* LM3530_BRT_CTRL_REG */
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reg_val[6] = LM3530_DEF_ZB_0; /* LM3530_ALS_ZB0_REG */
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reg_val[7] = LM3530_DEF_ZB_1; /* LM3530_ALS_ZB1_REG */
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reg_val[8] = LM3530_DEF_ZB_2; /* LM3530_ALS_ZB2_REG */
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reg_val[9] = LM3530_DEF_ZB_3; /* LM3530_ALS_ZB3_REG */
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reg_val[6] = zones[0]; /* LM3530_ALS_ZB0_REG */
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reg_val[7] = zones[1]; /* LM3530_ALS_ZB1_REG */
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reg_val[8] = zones[2]; /* LM3530_ALS_ZB2_REG */
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reg_val[9] = zones[3]; /* LM3530_ALS_ZB3_REG */
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reg_val[10] = LM3530_DEF_ZT_0; /* LM3530_ALS_Z0T_REG */
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reg_val[11] = LM3530_DEF_ZT_1; /* LM3530_ALS_Z1T_REG */
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reg_val[12] = LM3530_DEF_ZT_2; /* LM3530_ALS_Z2T_REG */
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@ -265,6 +287,24 @@ static void lm3530_brightness_set(struct led_classdev *led_cdev,
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}
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}
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static ssize_t lm3530_mode_get(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct i2c_client *client = container_of(
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dev->parent, struct i2c_client, dev);
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struct lm3530_data *drvdata = i2c_get_clientdata(client);
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int i, len = 0;
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for (i = 0; i < ARRAY_SIZE(mode_map); i++)
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if (drvdata->mode == mode_map[i].mode_val)
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len += sprintf(buf + len, "[%s] ", mode_map[i].mode);
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else
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len += sprintf(buf + len, "%s ", mode_map[i].mode);
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len += sprintf(buf + len, "\n");
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return len;
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}
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static ssize_t lm3530_mode_set(struct device *dev, struct device_attribute
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*attr, const char *buf, size_t size)
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@ -298,8 +338,7 @@ static ssize_t lm3530_mode_set(struct device *dev, struct device_attribute
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return sizeof(drvdata->mode);
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}
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static DEVICE_ATTR(mode, 0644, NULL, lm3530_mode_set);
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static DEVICE_ATTR(mode, 0644, lm3530_mode_get, lm3530_mode_set);
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static int __devinit lm3530_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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@ -84,6 +84,8 @@ enum lm3530_als_mode {
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* @brt_ramp_rise: rate of rise of led current
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* @als1_resistor_sel: internal resistance from ALS1 input to ground
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* @als2_resistor_sel: internal resistance from ALS2 input to ground
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* @als_vmin: als input voltage calibrated for max brightness in mV
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* @als_vmax: als input voltage calibrated for min brightness in mV
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* @brt_val: brightness value (0-255)
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*/
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struct lm3530_platform_data {
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@ -101,6 +103,9 @@ struct lm3530_platform_data {
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u8 als1_resistor_sel;
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u8 als2_resistor_sel;
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u32 als_vmin;
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u32 als_vmax;
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u8 brt_val;
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};
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