bb982009d3
* add 'struct lm3530_pwm_data' in the platform data The pwm data is the platform specific functions which generate the pwm. The pwm data is only valid when brightness is pwm input mode. Functions should be implemented by the pwm driver. pwm_set_intensity() : set duty of pwm. pwm_get_intensity() : get current the brightness. * brightness control by pwm If the control mode is pwm, then brightness is changed by the duty of pwm=. So pwm platform function should be called in lm3530_brightness_set(). * do not update brightness register when pwm input mode In pwm input mode, brightness register is not used. If any value is updated in this register, then the led will be off. * when input mode is changed, set duty of pwm to 0 if unnecessary. Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com> Cc: Linus Walleij <linus.walleij@linaro.org> Cc: Richard Purdie <rpurdie@rpsys.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
121 lines
3.7 KiB
C
121 lines
3.7 KiB
C
/*
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* Copyright (C) 2011 ST-Ericsson SA.
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* Copyright (C) 2009 Motorola, Inc.
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*
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* License Terms: GNU General Public License v2
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*
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* Simple driver for National Semiconductor LM35330 Backlight driver chip
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*
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* Author: Shreshtha Kumar SAHU <shreshthakumar.sahu@stericsson.com>
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* based on leds-lm3530.c by Dan Murphy <D.Murphy@motorola.com>
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*/
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#ifndef _LINUX_LED_LM3530_H__
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#define _LINUX_LED_LM3530_H__
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#define LM3530_FS_CURR_5mA (0) /* Full Scale Current */
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#define LM3530_FS_CURR_8mA (1)
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#define LM3530_FS_CURR_12mA (2)
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#define LM3530_FS_CURR_15mA (3)
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#define LM3530_FS_CURR_19mA (4)
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#define LM3530_FS_CURR_22mA (5)
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#define LM3530_FS_CURR_26mA (6)
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#define LM3530_FS_CURR_29mA (7)
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#define LM3530_ALS_AVRG_TIME_32ms (0) /* ALS Averaging Time */
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#define LM3530_ALS_AVRG_TIME_64ms (1)
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#define LM3530_ALS_AVRG_TIME_128ms (2)
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#define LM3530_ALS_AVRG_TIME_256ms (3)
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#define LM3530_ALS_AVRG_TIME_512ms (4)
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#define LM3530_ALS_AVRG_TIME_1024ms (5)
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#define LM3530_ALS_AVRG_TIME_2048ms (6)
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#define LM3530_ALS_AVRG_TIME_4096ms (7)
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#define LM3530_RAMP_TIME_1ms (0) /* Brigtness Ramp Time */
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#define LM3530_RAMP_TIME_130ms (1) /* Max to 0 and vice versa */
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#define LM3530_RAMP_TIME_260ms (2)
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#define LM3530_RAMP_TIME_520ms (3)
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#define LM3530_RAMP_TIME_1s (4)
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#define LM3530_RAMP_TIME_2s (5)
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#define LM3530_RAMP_TIME_4s (6)
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#define LM3530_RAMP_TIME_8s (7)
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/* ALS Resistor Select */
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#define LM3530_ALS_IMPD_Z (0x00) /* ALS Impedance */
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#define LM3530_ALS_IMPD_13_53kOhm (0x01)
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#define LM3530_ALS_IMPD_9_01kOhm (0x02)
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#define LM3530_ALS_IMPD_5_41kOhm (0x03)
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#define LM3530_ALS_IMPD_2_27kOhm (0x04)
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#define LM3530_ALS_IMPD_1_94kOhm (0x05)
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#define LM3530_ALS_IMPD_1_81kOhm (0x06)
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#define LM3530_ALS_IMPD_1_6kOhm (0x07)
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#define LM3530_ALS_IMPD_1_138kOhm (0x08)
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#define LM3530_ALS_IMPD_1_05kOhm (0x09)
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#define LM3530_ALS_IMPD_1_011kOhm (0x0A)
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#define LM3530_ALS_IMPD_941Ohm (0x0B)
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#define LM3530_ALS_IMPD_759Ohm (0x0C)
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#define LM3530_ALS_IMPD_719Ohm (0x0D)
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#define LM3530_ALS_IMPD_700Ohm (0x0E)
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#define LM3530_ALS_IMPD_667Ohm (0x0F)
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enum lm3530_mode {
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LM3530_BL_MODE_MANUAL = 0, /* "man" */
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LM3530_BL_MODE_ALS, /* "als" */
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LM3530_BL_MODE_PWM, /* "pwm" */
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};
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/* ALS input select */
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enum lm3530_als_mode {
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LM3530_INPUT_AVRG = 0, /* ALS1 and ALS2 input average */
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LM3530_INPUT_ALS1, /* ALS1 Input */
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LM3530_INPUT_ALS2, /* ALS2 Input */
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LM3530_INPUT_CEIL, /* Max of ALS1 and ALS2 */
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};
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/* PWM Platform Specific Data */
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struct lm3530_pwm_data {
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void (*pwm_set_intensity) (int brightness, int max_brightness);
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int (*pwm_get_intensity) (int max_brightness);
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};
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/**
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* struct lm3530_platform_data
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* @mode: mode of operation i.e. Manual, ALS or PWM
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* @als_input_mode: select source of ALS input - ALS1/2 or average
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* @max_current: full scale LED current
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* @pwm_pol_hi: PWM input polarity - active high/active low
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* @als_avrg_time: ALS input averaging time
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* @brt_ramp_law: brightness mapping mode - exponential/linear
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* @brt_ramp_fall: rate of fall of led current
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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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* @pwm_data: PWM control functions (only valid when the mode is PWM)
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*/
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struct lm3530_platform_data {
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enum lm3530_mode mode;
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enum lm3530_als_mode als_input_mode;
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u8 max_current;
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bool pwm_pol_hi;
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u8 als_avrg_time;
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bool brt_ramp_law;
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u8 brt_ramp_fall;
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u8 brt_ramp_rise;
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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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struct lm3530_pwm_data pwm_data;
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};
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#endif /* _LINUX_LED_LM3530_H__ */
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