leds: add driver for LM3530 ALS
Simple backlight driver for National Semiconductor LM3530. Presently only manual mode is supported, PWM and ALS support to be added. Signed-off-by: Shreshtha Kumar Sahu <shreshthakumar.sahu@stericsson.com> Cc: Linus Walleij <linus.walleij@stericsson.com> Cc: Richard Purdie <rpurdie@rpsys.net> 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
parent
551ea73838
commit
b1e6b7068f
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@ -34,6 +34,16 @@ config LEDS_ATMEL_PWM
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This option enables support for LEDs driven using outputs
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of the dedicated PWM controller found on newer Atmel SOCs.
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config LEDS_LM3530
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tristate "LCD Backlight driver for LM3530"
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depends on LEDS_CLASS
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depends on I2C
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help
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This option enables support for the LCD backlight using
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LM3530 ambient light sensor chip. This ALS chip can be
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controlled manually or using PWM input or using ambient
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light automatically.
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config LEDS_LOCOMO
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tristate "LED Support for Locomo device"
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depends on LEDS_CLASS
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@ -9,6 +9,7 @@ obj-$(CONFIG_LEDS_88PM860X) += leds-88pm860x.o
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obj-$(CONFIG_LEDS_ATMEL_PWM) += leds-atmel-pwm.o
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obj-$(CONFIG_LEDS_BD2802) += leds-bd2802.o
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obj-$(CONFIG_LEDS_LOCOMO) += leds-locomo.o
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obj-$(CONFIG_LEDS_LM3530) += leds-lm3530.o
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obj-$(CONFIG_LEDS_MIKROTIK_RB532) += leds-rb532.o
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obj-$(CONFIG_LEDS_S3C24XX) += leds-s3c24xx.o
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obj-$(CONFIG_LEDS_AMS_DELTA) += leds-ams-delta.o
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@ -0,0 +1,378 @@
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/*
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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 LM3530 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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#include <linux/i2c.h>
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#include <linux/leds.h>
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#include <linux/slab.h>
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#include <linux/platform_device.h>
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#include <linux/input.h>
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#include <linux/led-lm3530.h>
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#include <linux/types.h>
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#define LM3530_LED_DEV "lcd-backlight"
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#define LM3530_NAME "lm3530-led"
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#define LM3530_GEN_CONFIG 0x10
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#define LM3530_ALS_CONFIG 0x20
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#define LM3530_BRT_RAMP_RATE 0x30
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#define LM3530_ALS_ZONE_REG 0x40
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#define LM3530_ALS_IMP_SELECT 0x41
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#define LM3530_BRT_CTRL_REG 0xA0
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#define LM3530_ALS_ZB0_REG 0x60
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#define LM3530_ALS_ZB1_REG 0x61
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#define LM3530_ALS_ZB2_REG 0x62
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#define LM3530_ALS_ZB3_REG 0x63
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#define LM3530_ALS_Z0T_REG 0x70
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#define LM3530_ALS_Z1T_REG 0x71
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#define LM3530_ALS_Z2T_REG 0x72
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#define LM3530_ALS_Z3T_REG 0x73
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#define LM3530_ALS_Z4T_REG 0x74
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#define LM3530_REG_MAX 15
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/* General Control Register */
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#define LM3530_EN_I2C_SHIFT (0)
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#define LM3530_RAMP_LAW_SHIFT (1)
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#define LM3530_MAX_CURR_SHIFT (2)
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#define LM3530_EN_PWM_SHIFT (5)
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#define LM3530_PWM_POL_SHIFT (6)
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#define LM3530_EN_PWM_SIMPLE_SHIFT (7)
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#define LM3530_ENABLE_I2C (1 << LM3530_EN_I2C_SHIFT)
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#define LM3530_ENABLE_PWM (1 << LM3530_EN_PWM_SHIFT)
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#define LM3530_POL_LOW (1 << LM3530_PWM_POL_SHIFT)
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#define LM3530_ENABLE_PWM_SIMPLE (1 << LM3530_EN_PWM_SIMPLE_SHIFT)
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/* ALS Config Register Options */
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#define LM3530_ALS_AVG_TIME_SHIFT (0)
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#define LM3530_EN_ALS_SHIFT (3)
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#define LM3530_ALS_SEL_SHIFT (5)
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#define LM3530_ENABLE_ALS (3 << LM3530_EN_ALS_SHIFT)
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/* Brightness Ramp Rate Register */
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#define LM3530_BRT_RAMP_FALL_SHIFT (0)
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#define LM3530_BRT_RAMP_RISE_SHIFT (3)
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/* ALS Resistor Select */
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#define LM3530_ALS1_IMP_SHIFT (0)
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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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/* 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_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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struct lm3530_mode_map {
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const char *mode;
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enum lm3530_mode mode_val;
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};
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static struct lm3530_mode_map mode_map[] = {
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{ "man", LM3530_BL_MODE_MANUAL },
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{ "als", LM3530_BL_MODE_ALS },
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{ "pwm", LM3530_BL_MODE_PWM },
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};
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/**
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* struct lm3530_data
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* @led_dev: led class device
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* @client: i2c client
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* @pdata: LM3530 platform data
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* @mode: mode of operation - manual, ALS, PWM
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*/
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struct lm3530_data {
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struct led_classdev led_dev;
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struct i2c_client *client;
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struct lm3530_platform_data *pdata;
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enum lm3530_mode mode;
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};
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static const u8 lm3530_reg[LM3530_REG_MAX] = {
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LM3530_GEN_CONFIG,
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LM3530_ALS_CONFIG,
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LM3530_BRT_RAMP_RATE,
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LM3530_ALS_ZONE_REG,
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LM3530_ALS_IMP_SELECT,
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LM3530_BRT_CTRL_REG,
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LM3530_ALS_ZB0_REG,
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LM3530_ALS_ZB1_REG,
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LM3530_ALS_ZB2_REG,
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LM3530_ALS_ZB3_REG,
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LM3530_ALS_Z0T_REG,
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LM3530_ALS_Z1T_REG,
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LM3530_ALS_Z2T_REG,
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LM3530_ALS_Z3T_REG,
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LM3530_ALS_Z4T_REG,
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};
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static int lm3530_get_mode_from_str(const char *str)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(mode_map); i++)
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if (sysfs_streq(str, mode_map[i].mode))
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return mode_map[i].mode_val;
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return -1;
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}
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static int lm3530_init_registers(struct lm3530_data *drvdata)
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{
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int ret = 0;
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int i;
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u8 gen_config;
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u8 als_config = 0;
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u8 brt_ramp;
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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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struct lm3530_platform_data *pltfm = drvdata->pdata;
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struct i2c_client *client = drvdata->client;
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gen_config = (pltfm->brt_ramp_law << LM3530_RAMP_LAW_SHIFT) |
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((pltfm->max_current & 7) << LM3530_MAX_CURR_SHIFT);
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if (drvdata->mode == LM3530_BL_MODE_MANUAL ||
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drvdata->mode == LM3530_BL_MODE_ALS)
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gen_config |= (LM3530_ENABLE_I2C);
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if (drvdata->mode == LM3530_BL_MODE_ALS) {
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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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(pltfm->als_input_mode << LM3530_ALS_SEL_SHIFT);
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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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gen_config |= (LM3530_ENABLE_PWM) |
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(pltfm->pwm_pol_hi << LM3530_PWM_POL_SHIFT) |
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(LM3530_ENABLE_PWM_SIMPLE);
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brt_ramp = (pltfm->brt_ramp_fall << LM3530_BRT_RAMP_FALL_SHIFT) |
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(pltfm->brt_ramp_rise << LM3530_BRT_RAMP_RISE_SHIFT);
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brightness = pltfm->brt_val;
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reg_val[0] = gen_config; /* LM3530_GEN_CONFIG */
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reg_val[1] = als_config; /* LM3530_ALS_CONFIG */
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reg_val[2] = brt_ramp; /* LM3530_BRT_RAMP_RATE */
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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[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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reg_val[13] = LM3530_DEF_ZT_3; /* LM3530_ALS_Z3T_REG */
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reg_val[14] = LM3530_DEF_ZT_4; /* LM3530_ALS_Z4T_REG */
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for (i = 0; i < LM3530_REG_MAX; i++) {
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ret = i2c_smbus_write_byte_data(client,
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lm3530_reg[i], reg_val[i]);
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if (ret)
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break;
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}
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return ret;
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}
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static void lm3530_brightness_set(struct led_classdev *led_cdev,
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enum led_brightness brt_val)
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{
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int err;
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struct lm3530_data *drvdata =
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container_of(led_cdev, struct lm3530_data, led_dev);
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switch (drvdata->mode) {
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case LM3530_BL_MODE_MANUAL:
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/* set the brightness in brightness control register*/
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err = i2c_smbus_write_byte_data(drvdata->client,
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LM3530_BRT_CTRL_REG, brt_val / 2);
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if (err)
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dev_err(&drvdata->client->dev,
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"Unable to set brightness: %d\n", err);
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break;
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case LM3530_BL_MODE_ALS:
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break;
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case LM3530_BL_MODE_PWM:
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break;
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default:
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break;
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}
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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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{
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int err;
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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 mode;
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mode = lm3530_get_mode_from_str(buf);
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if (mode < 0) {
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dev_err(dev, "Invalid mode\n");
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return -EINVAL;
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}
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if (mode == LM3530_BL_MODE_MANUAL)
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drvdata->mode = LM3530_BL_MODE_MANUAL;
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else if (mode == LM3530_BL_MODE_ALS)
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drvdata->mode = LM3530_BL_MODE_ALS;
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else if (mode == LM3530_BL_MODE_PWM) {
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dev_err(dev, "PWM mode not supported\n");
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return -EINVAL;
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}
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err = lm3530_init_registers(drvdata);
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if (err) {
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dev_err(dev, "Setting %s Mode failed :%d\n", buf, err);
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return err;
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}
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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 int __devinit lm3530_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct lm3530_platform_data *pdata = client->dev.platform_data;
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struct lm3530_data *drvdata;
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int err = 0;
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if (pdata == NULL) {
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dev_err(&client->dev, "platform data required\n");
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err = -ENODEV;
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goto err_out;
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}
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/* BL mode */
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if (pdata->mode > LM3530_BL_MODE_PWM) {
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dev_err(&client->dev, "Illegal Mode request\n");
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err = -EINVAL;
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goto err_out;
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}
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
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dev_err(&client->dev, "I2C_FUNC_I2C not supported\n");
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err = -EIO;
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goto err_out;
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}
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drvdata = kzalloc(sizeof(struct lm3530_data), GFP_KERNEL);
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if (drvdata == NULL) {
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err = -ENOMEM;
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goto err_out;
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}
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drvdata->mode = pdata->mode;
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drvdata->client = client;
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drvdata->pdata = pdata;
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drvdata->led_dev.name = LM3530_LED_DEV;
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drvdata->led_dev.brightness_set = lm3530_brightness_set;
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i2c_set_clientdata(client, drvdata);
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err = lm3530_init_registers(drvdata);
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if (err < 0) {
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dev_err(&client->dev, "Register Init failed: %d\n", err);
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err = -ENODEV;
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goto err_reg_init;
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}
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err = led_classdev_register((struct device *)
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&client->dev, &drvdata->led_dev);
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if (err < 0) {
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dev_err(&client->dev, "Register led class failed: %d\n", err);
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err = -ENODEV;
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goto err_class_register;
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}
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err = device_create_file(drvdata->led_dev.dev, &dev_attr_mode);
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if (err < 0) {
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dev_err(&client->dev, "File device creation failed: %d\n", err);
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err = -ENODEV;
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goto err_create_file;
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}
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return 0;
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err_create_file:
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led_classdev_unregister(&drvdata->led_dev);
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err_class_register:
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err_reg_init:
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kfree(drvdata);
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err_out:
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return err;
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}
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static int __devexit lm3530_remove(struct i2c_client *client)
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{
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struct lm3530_data *drvdata = i2c_get_clientdata(client);
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device_remove_file(drvdata->led_dev.dev, &dev_attr_mode);
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led_classdev_unregister(&drvdata->led_dev);
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kfree(drvdata);
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return 0;
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}
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static const struct i2c_device_id lm3530_id[] = {
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{LM3530_NAME, 0},
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{}
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};
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static struct i2c_driver lm3530_i2c_driver = {
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.probe = lm3530_probe,
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.remove = lm3530_remove,
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.id_table = lm3530_id,
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.driver = {
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.name = LM3530_NAME,
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.owner = THIS_MODULE,
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},
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};
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static int __init lm3530_init(void)
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{
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return i2c_add_driver(&lm3530_i2c_driver);
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}
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static void __exit lm3530_exit(void)
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{
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i2c_del_driver(&lm3530_i2c_driver);
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}
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module_init(lm3530_init);
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module_exit(lm3530_exit);
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MODULE_DESCRIPTION("Back Light driver for LM3530");
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Shreshtha Kumar SAHU <shreshthakumar.sahu@stericsson.com>");
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@ -0,0 +1,107 @@
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/*
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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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||||
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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 */
|
||||
#define LM3530_RAMP_TIME_130ms (1) /* Max to 0 and vice versa */
|
||||
#define LM3530_RAMP_TIME_260ms (2)
|
||||
#define LM3530_RAMP_TIME_520ms (3)
|
||||
#define LM3530_RAMP_TIME_1s (4)
|
||||
#define LM3530_RAMP_TIME_2s (5)
|
||||
#define LM3530_RAMP_TIME_4s (6)
|
||||
#define LM3530_RAMP_TIME_8s (7)
|
||||
|
||||
/* ALS Resistor Select */
|
||||
#define LM3530_ALS_IMPD_Z (0x00) /* ALS Impedence */
|
||||
#define LM3530_ALS_IMPD_13_53kOhm (0x01)
|
||||
#define LM3530_ALS_IMPD_9_01kOhm (0x02)
|
||||
#define LM3530_ALS_IMPD_5_41kOhm (0x03)
|
||||
#define LM3530_ALS_IMPD_2_27kOhm (0x04)
|
||||
#define LM3530_ALS_IMPD_1_94kOhm (0x05)
|
||||
#define LM3530_ALS_IMPD_1_81kOhm (0x06)
|
||||
#define LM3530_ALS_IMPD_1_6kOhm (0x07)
|
||||
#define LM3530_ALS_IMPD_1_138kOhm (0x08)
|
||||
#define LM3530_ALS_IMPD_1_05kOhm (0x09)
|
||||
#define LM3530_ALS_IMPD_1_011kOhm (0x0A)
|
||||
#define LM3530_ALS_IMPD_941Ohm (0x0B)
|
||||
#define LM3530_ALS_IMPD_759Ohm (0x0C)
|
||||
#define LM3530_ALS_IMPD_719Ohm (0x0D)
|
||||
#define LM3530_ALS_IMPD_700Ohm (0x0E)
|
||||
#define LM3530_ALS_IMPD_667Ohm (0x0F)
|
||||
|
||||
enum lm3530_mode {
|
||||
LM3530_BL_MODE_MANUAL = 0, /* "man" */
|
||||
LM3530_BL_MODE_ALS, /* "als" */
|
||||
LM3530_BL_MODE_PWM, /* "pwm" */
|
||||
};
|
||||
|
||||
/* ALS input select */
|
||||
enum lm3530_als_mode {
|
||||
LM3530_INPUT_AVRG = 0, /* ALS1 and ALS2 input average */
|
||||
LM3530_INPUT_ALS1, /* ALS1 Input */
|
||||
LM3530_INPUT_ALS2, /* ALS2 Input */
|
||||
LM3530_INPUT_CEIL, /* Max of ALS1 and ALS2 */
|
||||
};
|
||||
|
||||
/**
|
||||
* struct lm3530_platform_data
|
||||
* @mode: mode of operation i.e. Manual, ALS or PWM
|
||||
* @als_input_mode: select source of ALS input - ALS1/2 or average
|
||||
* @max_current: full scale LED current
|
||||
* @pwm_pol_hi: PWM input polarity - active high/active low
|
||||
* @als_avrg_time: ALS input averaging time
|
||||
* @brt_ramp_law: brightness mapping mode - exponential/linear
|
||||
* @brt_ramp_fall: rate of fall of led current
|
||||
* @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
|
||||
* @brt_val: brightness value (0-255)
|
||||
*/
|
||||
struct lm3530_platform_data {
|
||||
enum lm3530_mode mode;
|
||||
enum lm3530_als_mode als_input_mode;
|
||||
|
||||
u8 max_current;
|
||||
bool pwm_pol_hi;
|
||||
u8 als_avrg_time;
|
||||
|
||||
bool brt_ramp_law;
|
||||
u8 brt_ramp_fall;
|
||||
u8 brt_ramp_rise;
|
||||
|
||||
u8 als1_resistor_sel;
|
||||
u8 als2_resistor_sel;
|
||||
|
||||
u8 brt_val;
|
||||
};
|
||||
|
||||
#endif /* _LINUX_LED_LM3530_H__ */
|
||||
Reference in New Issue