1/*
2 * Copyright (C) 2011 ST-Ericsson SA.
3 * Copyright (C) 2009 Motorola, Inc.
4 *
5 * License Terms: GNU General Public License v2
6 *
7 * Simple driver for National Semiconductor LM35330 Backlight driver chip
8 *
9 * Author: Shreshtha Kumar SAHU <shreshthakumar.sahu@stericsson.com>
10 * based on leds-lm3530.c by Dan Murphy <D.Murphy@motorola.com>
11 */
12
13#ifndef _LINUX_LED_LM3530_H__
14#define _LINUX_LED_LM3530_H__
15
16#define LM3530_FS_CURR_5mA		(0) /* Full Scale Current */
17#define LM3530_FS_CURR_8mA		(1)
18#define LM3530_FS_CURR_12mA		(2)
19#define LM3530_FS_CURR_15mA		(3)
20#define LM3530_FS_CURR_19mA		(4)
21#define LM3530_FS_CURR_22mA		(5)
22#define LM3530_FS_CURR_26mA		(6)
23#define LM3530_FS_CURR_29mA		(7)
24
25#define LM3530_ALS_AVRG_TIME_32ms	(0) /* ALS Averaging Time */
26#define LM3530_ALS_AVRG_TIME_64ms	(1)
27#define LM3530_ALS_AVRG_TIME_128ms	(2)
28#define LM3530_ALS_AVRG_TIME_256ms	(3)
29#define LM3530_ALS_AVRG_TIME_512ms	(4)
30#define LM3530_ALS_AVRG_TIME_1024ms	(5)
31#define LM3530_ALS_AVRG_TIME_2048ms	(6)
32#define LM3530_ALS_AVRG_TIME_4096ms	(7)
33
34#define LM3530_RAMP_TIME_1ms		(0) /* Brigtness Ramp Time */
35#define LM3530_RAMP_TIME_130ms		(1) /* Max to 0 and vice versa */
36#define LM3530_RAMP_TIME_260ms		(2)
37#define LM3530_RAMP_TIME_520ms		(3)
38#define LM3530_RAMP_TIME_1s		(4)
39#define LM3530_RAMP_TIME_2s		(5)
40#define LM3530_RAMP_TIME_4s		(6)
41#define LM3530_RAMP_TIME_8s		(7)
42
43/* ALS Resistor Select */
44#define LM3530_ALS_IMPD_Z		(0x00) /* ALS Impedance */
45#define LM3530_ALS_IMPD_13_53kOhm	(0x01)
46#define LM3530_ALS_IMPD_9_01kOhm	(0x02)
47#define LM3530_ALS_IMPD_5_41kOhm	(0x03)
48#define LM3530_ALS_IMPD_2_27kOhm	(0x04)
49#define LM3530_ALS_IMPD_1_94kOhm	(0x05)
50#define LM3530_ALS_IMPD_1_81kOhm	(0x06)
51#define LM3530_ALS_IMPD_1_6kOhm		(0x07)
52#define LM3530_ALS_IMPD_1_138kOhm	(0x08)
53#define LM3530_ALS_IMPD_1_05kOhm	(0x09)
54#define LM3530_ALS_IMPD_1_011kOhm	(0x0A)
55#define LM3530_ALS_IMPD_941Ohm		(0x0B)
56#define LM3530_ALS_IMPD_759Ohm		(0x0C)
57#define LM3530_ALS_IMPD_719Ohm		(0x0D)
58#define LM3530_ALS_IMPD_700Ohm		(0x0E)
59#define LM3530_ALS_IMPD_667Ohm		(0x0F)
60
61enum lm3530_mode {
62	LM3530_BL_MODE_MANUAL = 0,	/* "man" */
63	LM3530_BL_MODE_ALS,		/* "als" */
64	LM3530_BL_MODE_PWM,		/* "pwm" */
65};
66
67/* ALS input select */
68enum lm3530_als_mode {
69	LM3530_INPUT_AVRG = 0,	/* ALS1 and ALS2 input average */
70	LM3530_INPUT_ALS1,	/* ALS1 Input */
71	LM3530_INPUT_ALS2,	/* ALS2 Input */
72	LM3530_INPUT_CEIL,	/* Max of ALS1 and ALS2 */
73};
74
75/* PWM Platform Specific Data */
76struct lm3530_pwm_data {
77	void (*pwm_set_intensity) (int brightness, int max_brightness);
78	int (*pwm_get_intensity) (int max_brightness);
79};
80
81/**
82 * struct lm3530_platform_data
83 * @mode: mode of operation i.e. Manual, ALS or PWM
84 * @als_input_mode: select source of ALS input - ALS1/2 or average
85 * @max_current: full scale LED current
86 * @pwm_pol_hi: PWM input polarity - active high/active low
87 * @als_avrg_time: ALS input averaging time
88 * @brt_ramp_law: brightness mapping mode - exponential/linear
89 * @brt_ramp_fall: rate of fall of led current
90 * @brt_ramp_rise: rate of rise of led current
91 * @als1_resistor_sel: internal resistance from ALS1 input to ground
92 * @als2_resistor_sel: internal resistance from ALS2 input to ground
93 * @als_vmin: als input voltage calibrated for max brightness in mV
94 * @als_vmax: als input voltage calibrated for min brightness in mV
95 * @brt_val: brightness value (0-127)
96 * @pwm_data: PWM control functions (only valid when the mode is PWM)
97 */
98struct lm3530_platform_data {
99	enum lm3530_mode mode;
100	enum lm3530_als_mode als_input_mode;
101
102	u8 max_current;
103	bool pwm_pol_hi;
104	u8 als_avrg_time;
105
106	bool brt_ramp_law;
107	u8 brt_ramp_fall;
108	u8 brt_ramp_rise;
109
110	u8 als1_resistor_sel;
111	u8 als2_resistor_sel;
112
113	u32 als_vmin;
114	u32 als_vmax;
115
116	u8 brt_val;
117
118	struct lm3530_pwm_data pwm_data;
119};
120
121#endif	/* _LINUX_LED_LM3530_H__ */
122