leds: Add LED driver for lm3556 chip
LM3556 : The LM3556 is a 4 MHz fixed-frequency synchronous boost converter plus 1.5A constant current driver for a high-current white LED. Datasheet: www.national.com/ds/LM/LM3556.pdf Tested on OMAP4430 (bryan.wu@canonical.com: use module_i2c_driver() rather than lm3556_init/lm3556_exit for code simplicity; fixed some typo pointed out by Rob Landley) Signed-off-by: G.Shark Jeong <gshark.jeong@gmail.com> Reviewed-by: Axel Lin <axel.lin@gmail.com> Reviewed-by: Kim, Milo <Milo.Kim@ti.com> Acked-by: Rob Landley <rob@landley.net> Signed-off-by: Bryan Wu <bryan.wu@canonical.com>
This commit is contained in:
G.Shark Jeong
Bryan Wu
parent
1522d02e27
commit
32abb4788d
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@ -6,3 +6,5 @@ leds-lp5521.txt
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- notes on how to use the leds-lp5521 driver.
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- notes on how to use the leds-lp5521 driver.
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leds-lp5523.txt
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leds-lp5523.txt
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- notes on how to use the leds-lp5523 driver.
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- notes on how to use the leds-lp5523 driver.
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leds-lm3556.txt
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- notes on how to use the leds-lm3556 driver.
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@ -0,0 +1,85 @@
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Kernel driver for lm3556
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========================
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*Texas Instrument:
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1.5 A Synchronous Boost LED Flash Driver w/ High-Side Current Source
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* Datasheet: http://www.national.com/ds/LM/LM3556.pdf
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Authors:
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Daniel Jeong
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Contact:Daniel Jeong(daniel.jeong-at-ti.com, gshark.jeong-at-gmail.com)
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Description
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-----------
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There are 3 functions in LM3556, Flash, Torch and Indicator.
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FLASH MODE
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In Flash Mode, the LED current source(LED) provides 16 target current levels
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from 93.75 mA to 1500 mA.The Flash currents are adjusted via the CURRENT
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CONTROL REGISTER(0x09).Flash mode is activated by the ENABLE REGISTER(0x0A),
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or by pulling the STROBE pin HIGH.
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LM3556 Flash can be controlled through sys/class/leds/flash/brightness file
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* if STROBE pin is enabled, below example control brightness only, and
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ON / OFF will be controlled by STROBE pin.
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Flash Example:
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OFF : #echo 0 > sys/class/leds/flash/brightness
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93.75 mA: #echo 1 > sys/class/leds/flash/brightness
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... .....
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1500 mA: #echo 16 > sys/class/leds/flash/brightness
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TORCH MODE
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In Torch Mode, the current source(LED) is programmed via the CURRENT CONTROL
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REGISTER(0x09).Torch Mode is activated by the ENABLE REGISTER(0x0A) or by the
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hardware TORCH input.
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LM3556 torch can be controlled through sys/class/leds/torch/brightness file.
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* if TORCH pin is enabled, below example control brightness only,
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and ON / OFF will be controlled by TORCH pin.
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Torch Example:
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OFF : #echo 0 > sys/class/leds/torch/brightness
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46.88 mA: #echo 1 > sys/class/leds/torch/brightness
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... .....
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375 mA : #echo 8 > sys/class/leds/torch/brightness
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INDICATOR MODE
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Indicator pattern can be set through sys/class/leds/indicator/pattern file,
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and 4 patterns are pre-defined in indicator_pattern array.
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According to N-lank, Pulse time and N Period values, different pattern wiill
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be generated.If you want new patterns for your own device, change
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indicator_pattern array with your own values and INDIC_PATTERN_SIZE.
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Please refer datasheet for more detail about N-Blank, Pulse time and N Period.
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Indicator pattern example:
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pattern 0: #echo 0 > sys/class/leds/indicator/pattern
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....
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pattern 3: #echo 3 > sys/class/leds/indicator/pattern
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Indicator brightness can be controlled through
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sys/class/leds/indicator/brightness file.
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Example:
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OFF : #echo 0 > sys/class/leds/indicator/brightness
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5.86 mA : #echo 1 > sys/class/leds/indicator/brightness
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........
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46.875mA : #echo 8 > sys/class/leds/indicator/brightness
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Notes
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-----
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Driver expects it is registered using the i2c_board_info mechanism.
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To register the chip at address 0x63 on specific adapter, set the platform data
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according to include/linux/platform_data/leds-lm3556.h, set the i2c board info
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Example:
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static struct i2c_board_info __initdata board_i2c_ch4[] = {
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{
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I2C_BOARD_INFO(LM3556_NAME, 0x63),
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.platform_data = &lm3556_pdata,
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},
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};
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and register it in the platform init function
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Example:
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board_register_i2c_bus(4, 400,
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board_i2c_ch4, ARRAY_SIZE(board_i2c_ch4));
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@ -415,6 +415,14 @@ config LEDS_MAX8997
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This option enables support for on-chip LED drivers on
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This option enables support for on-chip LED drivers on
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MAXIM MAX8997 PMIC.
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MAXIM MAX8997 PMIC.
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config LEDS_LM3556
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tristate "LED support for LM3556 Chip"
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depends on LEDS_CLASS && I2C
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select REGMAP_I2C
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help
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This option enables support for LEDs connected to LM3556.
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LM3556 includes Torch, Flash and Indicator functions.
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config LEDS_OT200
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config LEDS_OT200
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tristate "LED support for the Bachmann OT200"
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tristate "LED support for the Bachmann OT200"
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depends on LEDS_CLASS && HAS_IOMEM
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depends on LEDS_CLASS && HAS_IOMEM
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@ -47,6 +47,7 @@ obj-$(CONFIG_LEDS_NETXBIG) += leds-netxbig.o
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obj-$(CONFIG_LEDS_ASIC3) += leds-asic3.o
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obj-$(CONFIG_LEDS_ASIC3) += leds-asic3.o
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obj-$(CONFIG_LEDS_RENESAS_TPU) += leds-renesas-tpu.o
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obj-$(CONFIG_LEDS_RENESAS_TPU) += leds-renesas-tpu.o
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obj-$(CONFIG_LEDS_MAX8997) += leds-max8997.o
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obj-$(CONFIG_LEDS_MAX8997) += leds-max8997.o
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obj-$(CONFIG_LEDS_LM3556) += leds-lm3556.o
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# LED SPI Drivers
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# LED SPI Drivers
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obj-$(CONFIG_LEDS_DAC124S085) += leds-dac124s085.o
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obj-$(CONFIG_LEDS_DAC124S085) += leds-dac124s085.o
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@ -0,0 +1,512 @@
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/*
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* Simple driver for Texas Instruments LM3556 LED Flash driver chip (Rev0x03)
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* Copyright (C) 2012 Texas Instruments
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Please refer Documentation/leds/leds-lm3556.txt file.
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*/
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#include <linux/module.h>
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#include <linux/delay.h>
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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/fs.h>
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#include <linux/regmap.h>
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#include <linux/platform_data/leds-lm3556.h>
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#define REG_FILT_TIME (0x0)
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#define REG_IVFM_MODE (0x1)
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#define REG_NTC (0x2)
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#define REG_INDIC_TIME (0x3)
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#define REG_INDIC_BLINK (0x4)
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#define REG_INDIC_PERIOD (0x5)
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#define REG_TORCH_TIME (0x6)
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#define REG_CONF (0x7)
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#define REG_FLASH (0x8)
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#define REG_I_CTRL (0x9)
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#define REG_ENABLE (0xA)
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#define REG_FLAG (0xB)
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#define REG_MAX (0xB)
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#define IVFM_FILTER_TIME_SHIFT (3)
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#define UVLO_EN_SHIFT (7)
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#define HYSTERSIS_SHIFT (5)
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#define IVM_D_TH_SHIFT (2)
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#define IVFM_ADJ_MODE_SHIFT (0)
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#define NTC_EVENT_LVL_SHIFT (5)
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#define NTC_TRIP_TH_SHIFT (2)
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#define NTC_BIAS_I_LVL_SHIFT (0)
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#define INDIC_RAMP_UP_TIME_SHIFT (3)
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#define INDIC_RAMP_DN_TIME_SHIFT (0)
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#define INDIC_N_BLANK_SHIFT (4)
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#define INDIC_PULSE_TIME_SHIFT (0)
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#define INDIC_N_PERIOD_SHIFT (0)
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#define TORCH_RAMP_UP_TIME_SHIFT (3)
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#define TORCH_RAMP_DN_TIME_SHIFT (0)
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#define STROBE_USUAGE_SHIFT (7)
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#define STROBE_PIN_POLARITY_SHIFT (6)
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#define TORCH_PIN_POLARITY_SHIFT (5)
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#define TX_PIN_POLARITY_SHIFT (4)
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#define TX_EVENT_LVL_SHIFT (3)
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#define IVFM_EN_SHIFT (2)
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#define NTC_MODE_SHIFT (1)
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#define INDIC_MODE_SHIFT (0)
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#define INDUCTOR_I_LIMIT_SHIFT (6)
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#define FLASH_RAMP_TIME_SHIFT (3)
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#define FLASH_TOUT_TIME_SHIFT (0)
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#define TORCH_I_SHIFT (4)
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#define FLASH_I_SHIFT (0)
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#define NTC_EN_SHIFT (7)
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#define TX_PIN_EN_SHIFT (6)
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#define STROBE_PIN_EN_SHIFT (5)
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#define TORCH_PIN_EN_SHIFT (4)
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#define PRECHG_MODE_EN_SHIFT (3)
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#define PASS_MODE_ONLY_EN_SHIFT (2)
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#define MODE_BITS_SHIFT (0)
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#define IVFM_FILTER_TIME_MASK (0x3)
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#define UVLO_EN_MASK (0x1)
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#define HYSTERSIS_MASK (0x3)
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#define IVM_D_TH_MASK (0x7)
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#define IVFM_ADJ_MODE_MASK (0x3)
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#define NTC_EVENT_LVL_MASK (0x1)
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#define NTC_TRIP_TH_MASK (0x7)
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#define NTC_BIAS_I_LVL_MASK (0x3)
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#define INDIC_RAMP_UP_TIME_MASK (0x7)
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#define INDIC_RAMP_DN_TIME_MASK (0x7)
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#define INDIC_N_BLANK_MASK (0x7)
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#define INDIC_PULSE_TIME_MASK (0x7)
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#define INDIC_N_PERIOD_MASK (0x7)
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#define TORCH_RAMP_UP_TIME_MASK (0x7)
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#define TORCH_RAMP_DN_TIME_MASK (0x7)
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#define STROBE_USUAGE_MASK (0x1)
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#define STROBE_PIN_POLARITY_MASK (0x1)
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#define TORCH_PIN_POLARITY_MASK (0x1)
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#define TX_PIN_POLARITY_MASK (0x1)
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#define TX_EVENT_LVL_MASK (0x1)
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#define IVFM_EN_MASK (0x1)
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#define NTC_MODE_MASK (0x1)
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#define INDIC_MODE_MASK (0x1)
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#define INDUCTOR_I_LIMIT_MASK (0x3)
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#define FLASH_RAMP_TIME_MASK (0x7)
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#define FLASH_TOUT_TIME_MASK (0x7)
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#define TORCH_I_MASK (0x7)
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#define FLASH_I_MASK (0xF)
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#define NTC_EN_MASK (0x1)
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#define TX_PIN_EN_MASK (0x1)
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#define STROBE_PIN_EN_MASK (0x1)
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#define TORCH_PIN_EN_MASK (0x1)
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#define PRECHG_MODE_EN_MASK (0x1)
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#define PASS_MODE_ONLY_EN_MASK (0x1)
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#define MODE_BITS_MASK (0x13)
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#define EX_PIN_CONTROL_MASK (0xF1)
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#define EX_PIN_ENABLE_MASK (0x70)
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enum lm3556_indic_pulse_time {
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PULSE_TIME_0_MS = 0,
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PULSE_TIME_32_MS,
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PULSE_TIME_64_MS,
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PULSE_TIME_92_MS,
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PULSE_TIME_128_MS,
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PULSE_TIME_160_MS,
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PULSE_TIME_196_MS,
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PULSE_TIME_224_MS,
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PULSE_TIME_256_MS,
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PULSE_TIME_288_MS,
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PULSE_TIME_320_MS,
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PULSE_TIME_352_MS,
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PULSE_TIME_384_MS,
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PULSE_TIME_416_MS,
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PULSE_TIME_448_MS,
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PULSE_TIME_480_MS,
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};
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enum lm3556_indic_n_blank {
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INDIC_N_BLANK_0 = 0,
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INDIC_N_BLANK_1,
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INDIC_N_BLANK_2,
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INDIC_N_BLANK_3,
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INDIC_N_BLANK_4,
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INDIC_N_BLANK_5,
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INDIC_N_BLANK_6,
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INDIC_N_BLANK_7,
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INDIC_N_BLANK_8,
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INDIC_N_BLANK_9,
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INDIC_N_BLANK_10,
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INDIC_N_BLANK_11,
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INDIC_N_BLANK_12,
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INDIC_N_BLANK_13,
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INDIC_N_BLANK_14,
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INDIC_N_BLANK_15,
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};
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enum lm3556_indic_period {
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INDIC_PERIOD_0 = 0,
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INDIC_PERIOD_1,
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INDIC_PERIOD_2,
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INDIC_PERIOD_3,
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INDIC_PERIOD_4,
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INDIC_PERIOD_5,
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INDIC_PERIOD_6,
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INDIC_PERIOD_7,
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};
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enum lm3556_mode {
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MODES_STASNDBY = 0,
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MODES_INDIC,
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MODES_TORCH,
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MODES_FLASH
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};
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#define INDIC_PATTERN_SIZE 4
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struct indicator {
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u8 blinking;
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u8 period_cnt;
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};
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struct lm3556_chip_data {
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struct device *dev;
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struct led_classdev cdev_flash;
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struct led_classdev cdev_torch;
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struct led_classdev cdev_indicator;
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struct lm3556_platform_data *pdata;
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struct regmap *regmap;
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struct mutex lock;
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unsigned int last_flag;
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};
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/* indicator pattern */
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static struct indicator indicator_pattern[INDIC_PATTERN_SIZE] = {
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[0] = {(INDIC_N_BLANK_1 << INDIC_N_BLANK_SHIFT)
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| PULSE_TIME_32_MS, INDIC_PERIOD_1},
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[1] = {(INDIC_N_BLANK_15 << INDIC_N_BLANK_SHIFT)
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| PULSE_TIME_32_MS, INDIC_PERIOD_2},
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[2] = {(INDIC_N_BLANK_10 << INDIC_N_BLANK_SHIFT)
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| PULSE_TIME_32_MS, INDIC_PERIOD_4},
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[3] = {(INDIC_N_BLANK_5 << INDIC_N_BLANK_SHIFT)
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| PULSE_TIME_32_MS, INDIC_PERIOD_7},
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};
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/* chip initialize */
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static int __devinit lm3556_chip_init(struct lm3556_chip_data *chip)
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{
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unsigned int reg_val;
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int ret;
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struct lm3556_platform_data *pdata = chip->pdata;
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/* set config register */
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ret = regmap_read(chip->regmap, REG_CONF, ®_val);
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if (ret < 0) {
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||||||
|
dev_err(chip->dev, "Failed to read REG_CONF Register\n");
|
||||||
|
goto out;
|
||||||
|
}
|
||||||
|
|
||||||
|
reg_val &= (~EX_PIN_CONTROL_MASK);
|
||||||
|
reg_val |= ((pdata->torch_pin_polarity & 0x01)
|
||||||
|
<< TORCH_PIN_POLARITY_SHIFT);
|
||||||
|
reg_val |= ((pdata->strobe_usuage & 0x01) << STROBE_USUAGE_SHIFT);
|
||||||
|
reg_val |= ((pdata->strobe_pin_polarity & 0x01)
|
||||||
|
<< STROBE_PIN_POLARITY_SHIFT);
|
||||||
|
reg_val |= ((pdata->tx_pin_polarity & 0x01) << TX_PIN_POLARITY_SHIFT);
|
||||||
|
reg_val |= ((pdata->indicator_mode & 0x01) << INDIC_MODE_SHIFT);
|
||||||
|
|
||||||
|
ret = regmap_write(chip->regmap, REG_CONF, reg_val);
|
||||||
|
if (ret < 0) {
|
||||||
|
dev_err(chip->dev, "Failed to write REG_CONF Regisgter\n");
|
||||||
|
goto out;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* set enable register */
|
||||||
|
ret = regmap_read(chip->regmap, REG_ENABLE, ®_val);
|
||||||
|
if (ret < 0) {
|
||||||
|
dev_err(chip->dev, "Failed to read REG_ENABLE Register\n");
|
||||||
|
goto out;
|
||||||
|
}
|
||||||
|
|
||||||
|
reg_val &= (~EX_PIN_ENABLE_MASK);
|
||||||
|
reg_val |= ((pdata->torch_pin_en & 0x01) << TORCH_PIN_EN_SHIFT);
|
||||||
|
reg_val |= ((pdata->strobe_pin_en & 0x01) << STROBE_PIN_EN_SHIFT);
|
||||||
|
reg_val |= ((pdata->tx_pin_en & 0x01) << TX_PIN_EN_SHIFT);
|
||||||
|
|
||||||
|
ret = regmap_write(chip->regmap, REG_ENABLE, reg_val);
|
||||||
|
if (ret < 0) {
|
||||||
|
dev_err(chip->dev, "Failed to write REG_ENABLE Regisgter\n");
|
||||||
|
goto out;
|
||||||
|
}
|
||||||
|
|
||||||
|
out:
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* chip control */
|
||||||
|
static int lm3556_control(struct lm3556_chip_data *chip,
|
||||||
|
u8 brightness, enum lm3556_mode opmode)
|
||||||
|
{
|
||||||
|
int ret;
|
||||||
|
struct lm3556_platform_data *pdata = chip->pdata;
|
||||||
|
|
||||||
|
ret = regmap_read(chip->regmap, REG_FLAG, &chip->last_flag);
|
||||||
|
if (ret < 0) {
|
||||||
|
dev_err(chip->dev, "Failed to read REG_FLAG Register\n");
|
||||||
|
goto out;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (chip->last_flag)
|
||||||
|
dev_info(chip->dev, "Last FLAG is 0x%x\n", chip->last_flag);
|
||||||
|
|
||||||
|
/* brightness 0 means off-state */
|
||||||
|
if (!brightness)
|
||||||
|
opmode = MODES_STASNDBY;
|
||||||
|
|
||||||
|
switch (opmode) {
|
||||||
|
case MODES_TORCH:
|
||||||
|
ret = regmap_update_bits(chip->regmap, REG_I_CTRL,
|
||||||
|
TORCH_I_MASK << TORCH_I_SHIFT,
|
||||||
|
(brightness - 1) << TORCH_I_SHIFT);
|
||||||
|
|
||||||
|
if (pdata->torch_pin_en)
|
||||||
|
opmode |= (TORCH_PIN_EN_MASK << TORCH_PIN_EN_SHIFT);
|
||||||
|
break;
|
||||||
|
|
||||||
|
case MODES_FLASH:
|
||||||
|
ret = regmap_update_bits(chip->regmap, REG_I_CTRL,
|
||||||
|
FLASH_I_MASK << FLASH_I_SHIFT,
|
||||||
|
(brightness - 1) << FLASH_I_SHIFT);
|
||||||
|
break;
|
||||||
|
|
||||||
|
case MODES_INDIC:
|
||||||
|
ret = regmap_update_bits(chip->regmap, REG_I_CTRL,
|
||||||
|
TORCH_I_MASK << TORCH_I_SHIFT,
|
||||||
|
(brightness - 1) << TORCH_I_SHIFT);
|
||||||
|
break;
|
||||||
|
|
||||||
|
case MODES_STASNDBY:
|
||||||
|
if (pdata->torch_pin_en)
|
||||||
|
opmode |= (TORCH_PIN_EN_MASK << TORCH_PIN_EN_SHIFT);
|
||||||
|
break;
|
||||||
|
|
||||||
|
default:
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
if (ret < 0) {
|
||||||
|
dev_err(chip->dev, "Failed to write REG_I_CTRL Register\n");
|
||||||
|
goto out;
|
||||||
|
}
|
||||||
|
ret = regmap_update_bits(chip->regmap, REG_ENABLE,
|
||||||
|
MODE_BITS_MASK << MODE_BITS_SHIFT,
|
||||||
|
opmode << MODE_BITS_SHIFT);
|
||||||
|
|
||||||
|
out:
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* torch */
|
||||||
|
static void lm3556_torch_brightness_set(struct led_classdev *cdev,
|
||||||
|
enum led_brightness brightness)
|
||||||
|
{
|
||||||
|
struct lm3556_chip_data *chip =
|
||||||
|
container_of(cdev, struct lm3556_chip_data, cdev_torch);
|
||||||
|
|
||||||
|
mutex_lock(&chip->lock);
|
||||||
|
lm3556_control(chip, brightness, MODES_TORCH);
|
||||||
|
mutex_unlock(&chip->lock);
|
||||||
|
}
|
||||||
|
|
||||||
|
/* flash */
|
||||||
|
static void lm3556_strobe_brightness_set(struct led_classdev *cdev,
|
||||||
|
enum led_brightness brightness)
|
||||||
|
{
|
||||||
|
struct lm3556_chip_data *chip =
|
||||||
|
container_of(cdev, struct lm3556_chip_data, cdev_flash);
|
||||||
|
|
||||||
|
mutex_lock(&chip->lock);
|
||||||
|
lm3556_control(chip, brightness, MODES_FLASH);
|
||||||
|
mutex_unlock(&chip->lock);
|
||||||
|
}
|
||||||
|
|
||||||
|
/* indicator */
|
||||||
|
static void lm3556_indicator_brightness_set(struct led_classdev *cdev,
|
||||||
|
enum led_brightness brightness)
|
||||||
|
{
|
||||||
|
struct lm3556_chip_data *chip =
|
||||||
|
container_of(cdev, struct lm3556_chip_data, cdev_indicator);
|
||||||
|
|
||||||
|
mutex_lock(&chip->lock);
|
||||||
|
lm3556_control(chip, brightness, MODES_INDIC);
|
||||||
|
mutex_unlock(&chip->lock);
|
||||||
|
}
|
||||||
|
|
||||||
|
/* indicator pattern */
|
||||||
|
static ssize_t lm3556_indicator_pattern_store(struct device *dev,
|
||||||
|
struct device_attribute *devAttr,
|
||||||
|
const char *buf, size_t size)
|
||||||
|
{
|
||||||
|
ssize_t ret;
|
||||||
|
struct led_classdev *led_cdev = dev_get_drvdata(dev);
|
||||||
|
struct lm3556_chip_data *chip =
|
||||||
|
container_of(led_cdev, struct lm3556_chip_data, cdev_indicator);
|
||||||
|
unsigned int state;
|
||||||
|
|
||||||
|
ret = kstrtouint(buf, 10, &state);
|
||||||
|
if (ret)
|
||||||
|
goto out;
|
||||||
|
if (state > INDIC_PATTERN_SIZE - 1)
|
||||||
|
state = INDIC_PATTERN_SIZE - 1;
|
||||||
|
|
||||||
|
ret = regmap_write(chip->regmap, REG_INDIC_BLINK,
|
||||||
|
indicator_pattern[state].blinking);
|
||||||
|
if (ret < 0) {
|
||||||
|
dev_err(chip->dev, "Failed to write REG_ENABLE Regisgter\n");
|
||||||
|
goto out;
|
||||||
|
}
|
||||||
|
|
||||||
|
ret = regmap_write(chip->regmap, REG_INDIC_PERIOD,
|
||||||
|
indicator_pattern[state].period_cnt);
|
||||||
|
if (ret < 0) {
|
||||||
|
dev_err(chip->dev, "Failed to write REG_ENABLE Regisgter\n");
|
||||||
|
goto out;
|
||||||
|
}
|
||||||
|
|
||||||
|
return size;
|
||||||
|
out:
|
||||||
|
dev_err(chip->dev, "Indicator pattern doesn't saved\n");
|
||||||
|
return size;
|
||||||
|
}
|
||||||
|
|
||||||
|
static DEVICE_ATTR(pattern, 0666, NULL, lm3556_indicator_pattern_store);
|
||||||
|
|
||||||
|
static const struct regmap_config lm3556_regmap = {
|
||||||
|
.reg_bits = 8,
|
||||||
|
.val_bits = 8,
|
||||||
|
.max_register = REG_MAX,
|
||||||
|
};
|
||||||
|
|
||||||
|
/* module initialize */
|
||||||
|
static int __devinit lm3556_probe(struct i2c_client *client,
|
||||||
|
const struct i2c_device_id *id)
|
||||||
|
{
|
||||||
|
struct lm3556_platform_data *pdata = client->dev.platform_data;
|
||||||
|
struct lm3556_chip_data *chip;
|
||||||
|
|
||||||
|
int err;
|
||||||
|
|
||||||
|
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
|
||||||
|
dev_err(&client->dev, "i2c functionality check fail.\n");
|
||||||
|
return -EOPNOTSUPP;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (pdata == NULL) {
|
||||||
|
dev_err(&client->dev, "Needs Platform Data.\n");
|
||||||
|
return -ENODATA;
|
||||||
|
}
|
||||||
|
|
||||||
|
chip =
|
||||||
|
devm_kzalloc(&client->dev, sizeof(struct lm3556_chip_data),
|
||||||
|
GFP_KERNEL);
|
||||||
|
if (!chip)
|
||||||
|
return -ENOMEM;
|
||||||
|
|
||||||
|
chip->dev = &client->dev;
|
||||||
|
chip->pdata = pdata;
|
||||||
|
|
||||||
|
chip->regmap = devm_regmap_init_i2c(client, &lm3556_regmap);
|
||||||
|
if (IS_ERR(chip->regmap)) {
|
||||||
|
err = PTR_ERR(chip->regmap);
|
||||||
|
dev_err(&client->dev, "Failed to allocate register map: %d\n",
|
||||||
|
err);
|
||||||
|
return err;
|
||||||
|
}
|
||||||
|
|
||||||
|
mutex_init(&chip->lock);
|
||||||
|
i2c_set_clientdata(client, chip);
|
||||||
|
|
||||||
|
err = lm3556_chip_init(chip);
|
||||||
|
if (err < 0)
|
||||||
|
goto err_out;
|
||||||
|
|
||||||
|
/* flash */
|
||||||
|
chip->cdev_flash.name = "flash";
|
||||||
|
chip->cdev_flash.max_brightness = 16;
|
||||||
|
chip->cdev_flash.brightness_set = lm3556_strobe_brightness_set;
|
||||||
|
err = led_classdev_register((struct device *)
|
||||||
|
&client->dev, &chip->cdev_flash);
|
||||||
|
if (err < 0)
|
||||||
|
goto err_out;
|
||||||
|
/* torch */
|
||||||
|
chip->cdev_torch.name = "torch";
|
||||||
|
chip->cdev_torch.max_brightness = 8;
|
||||||
|
chip->cdev_torch.brightness_set = lm3556_torch_brightness_set;
|
||||||
|
err = led_classdev_register((struct device *)
|
||||||
|
&client->dev, &chip->cdev_torch);
|
||||||
|
if (err < 0)
|
||||||
|
goto err_create_torch_file;
|
||||||
|
/* indicator */
|
||||||
|
chip->cdev_indicator.name = "indicator";
|
||||||
|
chip->cdev_indicator.max_brightness = 8;
|
||||||
|
chip->cdev_indicator.brightness_set = lm3556_indicator_brightness_set;
|
||||||
|
err = led_classdev_register((struct device *)
|
||||||
|
&client->dev, &chip->cdev_indicator);
|
||||||
|
if (err < 0)
|
||||||
|
goto err_create_indicator_file;
|
||||||
|
|
||||||
|
err = device_create_file(chip->cdev_indicator.dev, &dev_attr_pattern);
|
||||||
|
if (err < 0)
|
||||||
|
goto err_create_pattern_file;
|
||||||
|
|
||||||
|
dev_info(&client->dev, "LM3556 is initialized\n");
|
||||||
|
return 0;
|
||||||
|
|
||||||
|
err_create_pattern_file:
|
||||||
|
led_classdev_unregister(&chip->cdev_indicator);
|
||||||
|
err_create_indicator_file:
|
||||||
|
led_classdev_unregister(&chip->cdev_torch);
|
||||||
|
err_create_torch_file:
|
||||||
|
led_classdev_unregister(&chip->cdev_flash);
|
||||||
|
err_out:
|
||||||
|
return err;
|
||||||
|
}
|
||||||
|
|
||||||
|
static int __devexit lm3556_remove(struct i2c_client *client)
|
||||||
|
{
|
||||||
|
struct lm3556_chip_data *chip = i2c_get_clientdata(client);
|
||||||
|
|
||||||
|
device_remove_file(chip->cdev_indicator.dev, &dev_attr_pattern);
|
||||||
|
led_classdev_unregister(&chip->cdev_indicator);
|
||||||
|
led_classdev_unregister(&chip->cdev_torch);
|
||||||
|
led_classdev_unregister(&chip->cdev_flash);
|
||||||
|
regmap_write(chip->regmap, REG_ENABLE, 0);
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
static const struct i2c_device_id lm3556_id[] = {
|
||||||
|
{LM3556_NAME, 0},
|
||||||
|
{}
|
||||||
|
};
|
||||||
|
|
||||||
|
MODULE_DEVICE_TABLE(i2c, lm3556_id);
|
||||||
|
|
||||||
|
static struct i2c_driver lm3556_i2c_driver = {
|
||||||
|
.driver = {
|
||||||
|
.name = LM3556_NAME,
|
||||||
|
.owner = THIS_MODULE,
|
||||||
|
.pm = NULL,
|
||||||
|
},
|
||||||
|
.probe = lm3556_probe,
|
||||||
|
.remove = __devexit_p(lm3556_remove),
|
||||||
|
.id_table = lm3556_id,
|
||||||
|
};
|
||||||
|
|
||||||
|
module_i2c_driver(lm3556_i2c_driver);
|
||||||
|
|
||||||
|
MODULE_DESCRIPTION("Texas Instruments Flash Lighting driver for LM3556");
|
||||||
|
MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>");
|
||||||
|
MODULE_AUTHOR("G.Shark Jeong <gshark.jeong@gmail.com>");
|
||||||
|
MODULE_LICENSE("GPL v2");
|
||||||
|
|
@ -0,0 +1,50 @@
|
||||||
|
/*
|
||||||
|
* Simple driver for Texas Instruments LM3556 LED Flash driver chip (Rev0x03)
|
||||||
|
* Copyright (C) 2012 Texas Instruments
|
||||||
|
*
|
||||||
|
* This program is free software; you can redistribute it and/or modify
|
||||||
|
* it under the terms of the GNU General Public License version 2 as
|
||||||
|
* published by the Free Software Foundation.
|
||||||
|
*
|
||||||
|
*/
|
||||||
|
|
||||||
|
#ifndef __LINUX_LM3556_H
|
||||||
|
#define __LINUX_LM3556_H
|
||||||
|
|
||||||
|
#define LM3556_NAME "leds-lm3556"
|
||||||
|
|
||||||
|
enum lm3556_pin_polarity {
|
||||||
|
PIN_LOW_ACTIVE = 0,
|
||||||
|
PIN_HIGH_ACTIVE,
|
||||||
|
};
|
||||||
|
|
||||||
|
enum lm3556_pin_enable {
|
||||||
|
PIN_DISABLED = 0,
|
||||||
|
PIN_ENABLED,
|
||||||
|
};
|
||||||
|
|
||||||
|
enum lm3556_strobe_usuage {
|
||||||
|
STROBE_EDGE_DETECT = 0,
|
||||||
|
STROBE_LEVEL_DETECT,
|
||||||
|
};
|
||||||
|
|
||||||
|
enum lm3556_indic_mode {
|
||||||
|
INDIC_MODE_INTERNAL = 0,
|
||||||
|
INDIC_MODE_EXTERNAL,
|
||||||
|
};
|
||||||
|
|
||||||
|
struct lm3556_platform_data {
|
||||||
|
enum lm3556_pin_enable torch_pin_en;
|
||||||
|
enum lm3556_pin_polarity torch_pin_polarity;
|
||||||
|
|
||||||
|
enum lm3556_strobe_usuage strobe_usuage;
|
||||||
|
enum lm3556_pin_enable strobe_pin_en;
|
||||||
|
enum lm3556_pin_polarity strobe_pin_polarity;
|
||||||
|
|
||||||
|
enum lm3556_pin_enable tx_pin_en;
|
||||||
|
enum lm3556_pin_polarity tx_pin_polarity;
|
||||||
|
|
||||||
|
enum lm3556_indic_mode indicator_mode;
|
||||||
|
};
|
||||||
|
|
||||||
|
#endif /* __LINUX_LM3556_H */
|
||||||
Loading…
Reference in New Issue