leds: LED driver for National Semiconductor LP3944 Funlight Chip
LEDs driver for National Semiconductor LP3944 Funlight Chip http://www.national.com/pf/LP/LP3944.html This helper chip can drive up to 8 leds, with two programmable DIM modes; it could even be used as a gpio expander but this driver assumes it is used as a led controller. The DIM modes are used to set _blink_ patterns for leds, the pattern is specified supplying two parameters: - period: from 0s to 1.6s - duty cycle: percentage of the period the led is on, from 0 to 100 LP3944 can be found on Motorola A910 smartphone, where it drives the rgb leds, the camera flash light and the displays backlights. Signed-off-by: Antonio Ospite <ospite@studenti.unina.it> Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>
This commit is contained in:
Antonio Ospite
Richard Purdie
parent
07172d2bfa
commit
5054d39e32
5 changed files with 581 additions and 0 deletions
50
Documentation/leds-lp3944.txt
Normal file
50
Documentation/leds-lp3944.txt
Normal file
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@ -0,0 +1,50 @@
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Kernel driver lp3944
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====================
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* National Semiconductor LP3944 Fun-light Chip
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Prefix: 'lp3944'
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Addresses scanned: None (see the Notes section below)
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Datasheet: Publicly available at the National Semiconductor website
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http://www.national.com/pf/LP/LP3944.html
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Authors:
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Antonio Ospite <ospite@studenti.unina.it>
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Description
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-----------
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The LP3944 is a helper chip that can drive up to 8 leds, with two programmable
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DIM modes; it could even be used as a gpio expander but this driver assumes it
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is used as a led controller.
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The DIM modes are used to set _blink_ patterns for leds, the pattern is
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specified supplying two parameters:
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- period: from 0s to 1.6s
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- duty cycle: percentage of the period the led is on, from 0 to 100
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Setting a led in DIM0 or DIM1 mode makes it blink according to the pattern.
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See the datasheet for details.
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LP3944 can be found on Motorola A910 smartphone, where it drives the rgb
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leds, the camera flash light and the lcds power.
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Notes
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-----
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The chip is used mainly in embedded contexts, so this driver expects it is
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registered using the i2c_board_info mechanism.
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To register the chip at address 0x60 on adapter 0, set the platform data
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according to include/linux/leds-lp3944.h, set the i2c board info:
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static struct i2c_board_info __initdata a910_i2c_board_info[] = {
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{
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I2C_BOARD_INFO("lp3944", 0x60),
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.platform_data = &a910_lp3944_leds,
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},
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};
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and register it in the platform init function
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i2c_register_board_info(0, a910_i2c_board_info,
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ARRAY_SIZE(a910_i2c_board_info));
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@ -146,6 +146,17 @@ config LEDS_GPIO_OF
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of_platform devices. For instance, LEDs which are listed in a "dts"
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file.
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config LEDS_LP3944
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tristate "LED Support for N.S. LP3944 (Fun Light) I2C chip"
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depends on LEDS_CLASS && I2C
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help
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This option enables support for LEDs connected to the National
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Semiconductor LP3944 Lighting Management Unit (LMU) also known as
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Fun Light Chip.
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To compile this driver as a module, choose M here: the
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module will be called leds-lp3944.
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config LEDS_CLEVO_MAIL
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tristate "Mail LED on Clevo notebook"
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depends on LEDS_CLASS && X86 && SERIO_I8042 && DMI
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@ -20,6 +20,7 @@ obj-$(CONFIG_LEDS_COBALT_RAQ) += leds-cobalt-raq.o
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obj-$(CONFIG_LEDS_SUNFIRE) += leds-sunfire.o
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obj-$(CONFIG_LEDS_PCA9532) += leds-pca9532.o
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obj-$(CONFIG_LEDS_GPIO) += leds-gpio.o
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obj-$(CONFIG_LEDS_LP3944) += leds-lp3944.o
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obj-$(CONFIG_LEDS_CLEVO_MAIL) += leds-clevo-mail.o
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obj-$(CONFIG_LEDS_HP6XX) += leds-hp6xx.o
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obj-$(CONFIG_LEDS_FSG) += leds-fsg.o
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466
drivers/leds/leds-lp3944.c
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466
drivers/leds/leds-lp3944.c
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@ -0,0 +1,466 @@
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/*
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* leds-lp3944.c - driver for National Semiconductor LP3944 Funlight Chip
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*
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* Copyright (C) 2009 Antonio Ospite <ospite@studenti.unina.it>
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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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*/
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/*
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* I2C driver for National Semiconductor LP3944 Funlight Chip
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* http://www.national.com/pf/LP/LP3944.html
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*
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* This helper chip can drive up to 8 leds, with two programmable DIM modes;
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* it could even be used as a gpio expander but this driver assumes it is used
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* as a led controller.
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*
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* The DIM modes are used to set _blink_ patterns for leds, the pattern is
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* specified supplying two parameters:
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* - period: from 0s to 1.6s
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* - duty cycle: percentage of the period the led is on, from 0 to 100
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*
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* LP3944 can be found on Motorola A910 smartphone, where it drives the rgb
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* leds, the camera flash light and the displays backlights.
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*/
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#include <linux/module.h>
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#include <linux/i2c.h>
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#include <linux/leds.h>
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#include <linux/mutex.h>
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#include <linux/workqueue.h>
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#include <linux/leds-lp3944.h>
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/* Read Only Registers */
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#define LP3944_REG_INPUT1 0x00 /* LEDs 0-7 InputRegister (Read Only) */
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#define LP3944_REG_REGISTER1 0x01 /* None (Read Only) */
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#define LP3944_REG_PSC0 0x02 /* Frequency Prescaler 0 (R/W) */
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#define LP3944_REG_PWM0 0x03 /* PWM Register 0 (R/W) */
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#define LP3944_REG_PSC1 0x04 /* Frequency Prescaler 1 (R/W) */
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#define LP3944_REG_PWM1 0x05 /* PWM Register 1 (R/W) */
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#define LP3944_REG_LS0 0x06 /* LEDs 0-3 Selector (R/W) */
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#define LP3944_REG_LS1 0x07 /* LEDs 4-7 Selector (R/W) */
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/* These registers are not used to control leds in LP3944, they can store
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* arbitrary values which the chip will ignore.
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*/
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#define LP3944_REG_REGISTER8 0x08
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#define LP3944_REG_REGISTER9 0x09
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#define LP3944_DIM0 0
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#define LP3944_DIM1 1
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/* period in ms */
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#define LP3944_PERIOD_MIN 0
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#define LP3944_PERIOD_MAX 1600
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/* duty cycle is a percentage */
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#define LP3944_DUTY_CYCLE_MIN 0
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#define LP3944_DUTY_CYCLE_MAX 100
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#define ldev_to_led(c) container_of(c, struct lp3944_led_data, ldev)
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/* Saved data */
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struct lp3944_led_data {
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u8 id;
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enum lp3944_type type;
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enum lp3944_status status;
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struct led_classdev ldev;
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struct i2c_client *client;
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struct work_struct work;
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};
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struct lp3944_data {
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struct mutex lock;
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struct i2c_client *client;
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struct lp3944_led_data leds[LP3944_LEDS_MAX];
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};
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static int lp3944_reg_read(struct i2c_client *client, u8 reg, u8 *value)
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{
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int tmp;
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tmp = i2c_smbus_read_byte_data(client, reg);
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if (tmp < 0)
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return -EINVAL;
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*value = tmp;
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return 0;
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}
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static int lp3944_reg_write(struct i2c_client *client, u8 reg, u8 value)
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{
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return i2c_smbus_write_byte_data(client, reg, value);
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}
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/**
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* Set the period for DIM status
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*
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* @client: the i2c client
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* @dim: either LP3944_DIM0 or LP3944_DIM1
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* @period: period of a blink, that is a on/off cycle, expressed in ms.
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*/
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static int lp3944_dim_set_period(struct i2c_client *client, u8 dim, u16 period)
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{
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u8 psc_reg;
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u8 psc_value;
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int err;
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if (dim == LP3944_DIM0)
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psc_reg = LP3944_REG_PSC0;
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else if (dim == LP3944_DIM1)
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psc_reg = LP3944_REG_PSC1;
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else
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return -EINVAL;
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/* Convert period to Prescaler value */
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if (period > LP3944_PERIOD_MAX)
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return -EINVAL;
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psc_value = (period * 255) / LP3944_PERIOD_MAX;
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err = lp3944_reg_write(client, psc_reg, psc_value);
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return err;
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}
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/**
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* Set the duty cycle for DIM status
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*
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* @client: the i2c client
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* @dim: either LP3944_DIM0 or LP3944_DIM1
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* @duty_cycle: percentage of a period during which a led is ON
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*/
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static int lp3944_dim_set_dutycycle(struct i2c_client *client, u8 dim,
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u8 duty_cycle)
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{
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u8 pwm_reg;
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u8 pwm_value;
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int err;
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if (dim == LP3944_DIM0)
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pwm_reg = LP3944_REG_PWM0;
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else if (dim == LP3944_DIM1)
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pwm_reg = LP3944_REG_PWM1;
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else
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return -EINVAL;
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/* Convert duty cycle to PWM value */
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if (duty_cycle > LP3944_DUTY_CYCLE_MAX)
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return -EINVAL;
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pwm_value = (duty_cycle * 255) / LP3944_DUTY_CYCLE_MAX;
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err = lp3944_reg_write(client, pwm_reg, pwm_value);
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return err;
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}
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/**
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* Set the led status
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*
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* @led: a lp3944_led_data structure
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* @status: one of LP3944_LED_STATUS_OFF
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* LP3944_LED_STATUS_ON
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* LP3944_LED_STATUS_DIM0
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* LP3944_LED_STATUS_DIM1
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*/
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static int lp3944_led_set(struct lp3944_led_data *led, u8 status)
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{
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struct lp3944_data *data = i2c_get_clientdata(led->client);
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u8 id = led->id;
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u8 reg;
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u8 val = 0;
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int err;
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dev_dbg(&led->client->dev, "%s: %s, status before normalization:%d\n",
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__func__, led->ldev.name, status);
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switch (id) {
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case LP3944_LED0:
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case LP3944_LED1:
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case LP3944_LED2:
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case LP3944_LED3:
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reg = LP3944_REG_LS0;
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break;
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case LP3944_LED4:
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case LP3944_LED5:
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case LP3944_LED6:
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case LP3944_LED7:
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id -= LP3944_LED4;
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reg = LP3944_REG_LS1;
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break;
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default:
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return -EINVAL;
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}
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if (status > LP3944_LED_STATUS_DIM1)
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return -EINVAL;
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/* invert only 0 and 1, leave unchanged the other values,
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* remember we are abusing status to set blink patterns
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*/
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if (led->type == LP3944_LED_TYPE_LED_INVERTED && status < 2)
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status = 1 - status;
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mutex_lock(&data->lock);
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lp3944_reg_read(led->client, reg, &val);
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val &= ~(LP3944_LED_STATUS_MASK << (id << 1));
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val |= (status << (id << 1));
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dev_dbg(&led->client->dev, "%s: %s, reg:%d id:%d status:%d val:%#x\n",
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__func__, led->ldev.name, reg, id, status, val);
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/* set led status */
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err = lp3944_reg_write(led->client, reg, val);
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mutex_unlock(&data->lock);
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return err;
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}
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static int lp3944_led_set_blink(struct led_classdev *led_cdev,
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unsigned long *delay_on,
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unsigned long *delay_off)
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{
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struct lp3944_led_data *led = ldev_to_led(led_cdev);
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u16 period;
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u8 duty_cycle;
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int err;
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/* units are in ms */
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if (*delay_on + *delay_off > LP3944_PERIOD_MAX)
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return -EINVAL;
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if (*delay_on == 0 && *delay_off == 0) {
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/* Special case: the leds subsystem requires a default user
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* friendly blink pattern for the LED. Let's blink the led
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* slowly (1Hz).
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*/
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*delay_on = 500;
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*delay_off = 500;
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}
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period = (*delay_on) + (*delay_off);
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/* duty_cycle is the percentage of period during which the led is ON */
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duty_cycle = 100 * (*delay_on) / period;
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/* invert duty cycle for inverted leds, this has the same effect of
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* swapping delay_on and delay_off
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*/
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if (led->type == LP3944_LED_TYPE_LED_INVERTED)
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duty_cycle = 100 - duty_cycle;
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/* NOTE: using always the first DIM mode, this means that all leds
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* will have the same blinking pattern.
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*
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* We could find a way later to have two leds blinking in hardware
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* with different patterns at the same time, falling back to software
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* control for the other ones.
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*/
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err = lp3944_dim_set_period(led->client, LP3944_DIM0, period);
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if (err)
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return err;
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err = lp3944_dim_set_dutycycle(led->client, LP3944_DIM0, duty_cycle);
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if (err)
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return err;
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dev_dbg(&led->client->dev, "%s: OK hardware accelerated blink!\n",
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__func__);
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led->status = LP3944_LED_STATUS_DIM0;
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schedule_work(&led->work);
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return 0;
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}
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static void lp3944_led_set_brightness(struct led_classdev *led_cdev,
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enum led_brightness brightness)
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{
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struct lp3944_led_data *led = ldev_to_led(led_cdev);
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dev_dbg(&led->client->dev, "%s: %s, %d\n",
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__func__, led_cdev->name, brightness);
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led->status = brightness;
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schedule_work(&led->work);
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}
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static void lp3944_led_work(struct work_struct *work)
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{
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struct lp3944_led_data *led;
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led = container_of(work, struct lp3944_led_data, work);
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lp3944_led_set(led, led->status);
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}
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static int lp3944_configure(struct i2c_client *client,
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struct lp3944_data *data,
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struct lp3944_platform_data *pdata)
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{
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int i, err = 0;
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for (i = 0; i < pdata->leds_size; i++) {
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struct lp3944_led *pled = &pdata->leds[i];
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struct lp3944_led_data *led = &data->leds[i];
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led->client = client;
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led->id = i;
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switch (pled->type) {
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case LP3944_LED_TYPE_LED:
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case LP3944_LED_TYPE_LED_INVERTED:
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led->type = pled->type;
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led->status = pled->status;
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led->ldev.name = pled->name;
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led->ldev.max_brightness = 1;
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led->ldev.brightness_set = lp3944_led_set_brightness;
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led->ldev.blink_set = lp3944_led_set_blink;
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led->ldev.flags = LED_CORE_SUSPENDRESUME;
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INIT_WORK(&led->work, lp3944_led_work);
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err = led_classdev_register(&client->dev, &led->ldev);
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if (err < 0) {
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dev_err(&client->dev,
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"couldn't register LED %s\n",
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led->ldev.name);
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goto exit;
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}
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/* to expose the default value to userspace */
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led->ldev.brightness = led->status;
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/* Set the default led status */
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err = lp3944_led_set(led, led->status);
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if (err < 0) {
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dev_err(&client->dev,
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"%s couldn't set STATUS %d\n",
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led->ldev.name, led->status);
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goto exit;
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}
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break;
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case LP3944_LED_TYPE_NONE:
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default:
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break;
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}
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}
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return 0;
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exit:
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if (i > 0)
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for (i = i - 1; i >= 0; i--)
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switch (pdata->leds[i].type) {
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case LP3944_LED_TYPE_LED:
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case LP3944_LED_TYPE_LED_INVERTED:
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led_classdev_unregister(&data->leds[i].ldev);
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cancel_work_sync(&data->leds[i].work);
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break;
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case LP3944_LED_TYPE_NONE:
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default:
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break;
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}
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return err;
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}
|
||||
|
||||
static int __devinit lp3944_probe(struct i2c_client *client,
|
||||
const struct i2c_device_id *id)
|
||||
{
|
||||
struct lp3944_platform_data *lp3944_pdata = client->dev.platform_data;
|
||||
struct lp3944_data *data;
|
||||
|
||||
if (lp3944_pdata == NULL) {
|
||||
dev_err(&client->dev, "no platform data\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
/* Let's see whether this adapter can support what we need. */
|
||||
if (!i2c_check_functionality(client->adapter,
|
||||
I2C_FUNC_SMBUS_BYTE_DATA)) {
|
||||
dev_err(&client->dev, "insufficient functionality!\n");
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
data = kzalloc(sizeof(struct lp3944_data), GFP_KERNEL);
|
||||
if (!data)
|
||||
return -ENOMEM;
|
||||
|
||||
data->client = client;
|
||||
i2c_set_clientdata(client, data);
|
||||
|
||||
mutex_init(&data->lock);
|
||||
|
||||
dev_info(&client->dev, "lp3944 enabled\n");
|
||||
|
||||
lp3944_configure(client, data, lp3944_pdata);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int __devexit lp3944_remove(struct i2c_client *client)
|
||||
{
|
||||
struct lp3944_platform_data *pdata = client->dev.platform_data;
|
||||
struct lp3944_data *data = i2c_get_clientdata(client);
|
||||
int i;
|
||||
|
||||
for (i = 0; i < pdata->leds_size; i++)
|
||||
switch (data->leds[i].type) {
|
||||
case LP3944_LED_TYPE_LED:
|
||||
case LP3944_LED_TYPE_LED_INVERTED:
|
||||
led_classdev_unregister(&data->leds[i].ldev);
|
||||
cancel_work_sync(&data->leds[i].work);
|
||||
break;
|
||||
|
||||
case LP3944_LED_TYPE_NONE:
|
||||
default:
|
||||
break;
|
||||
}
|
||||
|
||||
kfree(data);
|
||||
i2c_set_clientdata(client, NULL);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* lp3944 i2c driver struct */
|
||||
static const struct i2c_device_id lp3944_id[] = {
|
||||
{"lp3944", 0},
|
||||
{}
|
||||
};
|
||||
|
||||
MODULE_DEVICE_TABLE(i2c, lp3944_id);
|
||||
|
||||
static struct i2c_driver lp3944_driver = {
|
||||
.driver = {
|
||||
.name = "lp3944",
|
||||
},
|
||||
.probe = lp3944_probe,
|
||||
.remove = __devexit_p(lp3944_remove),
|
||||
.id_table = lp3944_id,
|
||||
};
|
||||
|
||||
static int __init lp3944_module_init(void)
|
||||
{
|
||||
return i2c_add_driver(&lp3944_driver);
|
||||
}
|
||||
|
||||
static void __exit lp3944_module_exit(void)
|
||||
{
|
||||
i2c_del_driver(&lp3944_driver);
|
||||
}
|
||||
|
||||
module_init(lp3944_module_init);
|
||||
module_exit(lp3944_module_exit);
|
||||
|
||||
MODULE_AUTHOR("Antonio Ospite <ospite@studenti.unina.it>");
|
||||
MODULE_DESCRIPTION("LP3944 Fun Light Chip");
|
||||
MODULE_LICENSE("GPL");
|
||||
53
include/linux/leds-lp3944.h
Normal file
53
include/linux/leds-lp3944.h
Normal file
|
|
@ -0,0 +1,53 @@
|
|||
/*
|
||||
* leds-lp3944.h - platform data structure for lp3944 led controller
|
||||
*
|
||||
* Copyright (C) 2009 Antonio Ospite <ospite@studenti.unina.it>
|
||||
*
|
||||
* 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_LEDS_LP3944_H
|
||||
#define __LINUX_LEDS_LP3944_H
|
||||
|
||||
#include <linux/leds.h>
|
||||
#include <linux/workqueue.h>
|
||||
|
||||
#define LP3944_LED0 0
|
||||
#define LP3944_LED1 1
|
||||
#define LP3944_LED2 2
|
||||
#define LP3944_LED3 3
|
||||
#define LP3944_LED4 4
|
||||
#define LP3944_LED5 5
|
||||
#define LP3944_LED6 6
|
||||
#define LP3944_LED7 7
|
||||
#define LP3944_LEDS_MAX 8
|
||||
|
||||
#define LP3944_LED_STATUS_MASK 0x03
|
||||
enum lp3944_status {
|
||||
LP3944_LED_STATUS_OFF = 0x0,
|
||||
LP3944_LED_STATUS_ON = 0x1,
|
||||
LP3944_LED_STATUS_DIM0 = 0x2,
|
||||
LP3944_LED_STATUS_DIM1 = 0x3
|
||||
};
|
||||
|
||||
enum lp3944_type {
|
||||
LP3944_LED_TYPE_NONE,
|
||||
LP3944_LED_TYPE_LED,
|
||||
LP3944_LED_TYPE_LED_INVERTED,
|
||||
};
|
||||
|
||||
struct lp3944_led {
|
||||
char *name;
|
||||
enum lp3944_type type;
|
||||
enum lp3944_status status;
|
||||
};
|
||||
|
||||
struct lp3944_platform_data {
|
||||
struct lp3944_led leds[LP3944_LEDS_MAX];
|
||||
u8 leds_size;
|
||||
};
|
||||
|
||||
#endif /* __LINUX_LEDS_LP3944_H */
|
||||
Loading…
Reference in a new issue