backlight: new backlight driver for LP855x devices
THis driver supports TI LP8550/LP8551/LP8552/LP8553/LP8556 backlight devices. The brightness can be controlled by the I2C or PWM input. The lp855x driver provides both modes. For the PWM control, pwm-specific functions can be defined in the platform data. And some information can be read via the sysfs(lp855x device attributes). For details, please refer to Documentation/backlight/lp855x-driver.txt. [axel.lin@gmail.com: add missing mutex_unlock in lp855x_read_byte() error path] [axel.lin@gmail.com: check platform data in lp855x_probe()] [axel.lin@gmail.com: small cleanups] [dan.carpenter@oracle.com: silence a compiler warning] [axel.lin@gmail.com: use id->driver_data to differentiate lp855x chips] [akpm@linux-foundation.org: simplify boolean return expression] Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com> Signed-off-by: Axel Lin <axel.lin@gmail.com> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.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:
Kim, Milo
Linus Torvalds
Родитель
050ea48bbf
Коммит
7be865ab86
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@ -0,0 +1,78 @@
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Kernel driver lp855x
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====================
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Backlight driver for LP855x ICs
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Supported chips:
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Texas Instruments LP8550, LP8551, LP8552, LP8553 and LP8556
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Author: Milo(Woogyom) Kim <milo.kim@ti.com>
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Description
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-----------
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* Brightness control
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Brightness can be controlled by the pwm input or the i2c command.
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The lp855x driver supports both cases.
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* Device attributes
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1) bl_ctl_mode
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Backlight control mode.
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Value : pwm based or register based
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2) chip_id
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The lp855x chip id.
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Value : lp8550/lp8551/lp8552/lp8553/lp8556
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Platform data for lp855x
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------------------------
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For supporting platform specific data, the lp855x platform data can be used.
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* name : Backlight driver name. If it is not defined, default name is set.
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* mode : Brightness control mode. PWM or register based.
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* device_control : Value of DEVICE CONTROL register.
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* initial_brightness : Initial value of backlight brightness.
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* pwm_data : Platform specific pwm generation functions.
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Only valid when brightness is pwm input mode.
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Functions should be implemented by PWM driver.
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- pwm_set_intensity() : set duty of PWM
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- pwm_get_intensity() : get current duty of PWM
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* load_new_rom_data :
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0 : use default configuration data
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1 : update values of eeprom or eprom registers on loading driver
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* size_program : Total size of lp855x_rom_data.
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* rom_data : List of new eeprom/eprom registers.
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example 1) lp8552 platform data : i2c register mode with new eeprom data
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#define EEPROM_A5_ADDR 0xA5
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#define EEPROM_A5_VAL 0x4f /* EN_VSYNC=0 */
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static struct lp855x_rom_data lp8552_eeprom_arr[] = {
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{EEPROM_A5_ADDR, EEPROM_A5_VAL},
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};
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static struct lp855x_platform_data lp8552_pdata = {
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.name = "lcd-bl",
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.mode = REGISTER_BASED,
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.device_control = I2C_CONFIG(LP8552),
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.initial_brightness = INITIAL_BRT,
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.load_new_rom_data = 1,
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.size_program = ARRAY_SIZE(lp8552_eeprom_arr),
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.rom_data = lp8552_eeprom_arr,
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};
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example 2) lp8556 platform data : pwm input mode with default rom data
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static struct lp855x_platform_data lp8556_pdata = {
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.mode = PWM_BASED,
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.device_control = PWM_CONFIG(LP8556),
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.initial_brightness = INITIAL_BRT,
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.pwm_data = {
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.pwm_set_intensity = platform_pwm_set_intensity,
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.pwm_get_intensity = platform_pwm_get_intensity,
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},
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};
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@ -334,6 +334,13 @@ config BACKLIGHT_AAT2870
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If you have a AnalogicTech AAT2870 say Y to enable the
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backlight driver.
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config BACKLIGHT_LP855X
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tristate "Backlight driver for TI LP855X"
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depends on BACKLIGHT_CLASS_DEVICE && I2C
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help
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This supports TI LP8550, LP8551, LP8552, LP8553 and LP8556
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backlight driver.
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endif # BACKLIGHT_CLASS_DEVICE
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endif # BACKLIGHT_LCD_SUPPORT
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@ -22,6 +22,7 @@ obj-$(CONFIG_BACKLIGHT_GENERIC) += generic_bl.o
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obj-$(CONFIG_BACKLIGHT_HP700) += jornada720_bl.o
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obj-$(CONFIG_BACKLIGHT_HP680) += hp680_bl.o
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obj-$(CONFIG_BACKLIGHT_LOCOMO) += locomolcd.o
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obj-$(CONFIG_BACKLIGHT_LP855X) += lp855x_bl.o
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obj-$(CONFIG_BACKLIGHT_OMAP1) += omap1_bl.o
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obj-$(CONFIG_BACKLIGHT_PROGEAR) += progear_bl.o
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obj-$(CONFIG_BACKLIGHT_CARILLO_RANCH) += cr_bllcd.o
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@ -0,0 +1,331 @@
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/*
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* TI LP855x Backlight Driver
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*
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* Copyright (C) 2011 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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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/i2c.h>
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#include <linux/backlight.h>
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#include <linux/err.h>
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#include <linux/lp855x.h>
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/* Registers */
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#define BRIGHTNESS_CTRL (0x00)
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#define DEVICE_CTRL (0x01)
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#define BUF_SIZE 20
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#define DEFAULT_BL_NAME "lcd-backlight"
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#define MAX_BRIGHTNESS 255
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struct lp855x {
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const char *chipname;
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enum lp855x_chip_id chip_id;
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struct i2c_client *client;
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struct backlight_device *bl;
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struct device *dev;
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struct mutex xfer_lock;
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struct lp855x_platform_data *pdata;
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};
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static int lp855x_read_byte(struct lp855x *lp, u8 reg, u8 *data)
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{
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int ret;
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mutex_lock(&lp->xfer_lock);
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ret = i2c_smbus_read_byte_data(lp->client, reg);
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if (ret < 0) {
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mutex_unlock(&lp->xfer_lock);
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dev_err(lp->dev, "failed to read 0x%.2x\n", reg);
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return ret;
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}
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mutex_unlock(&lp->xfer_lock);
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*data = (u8)ret;
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return 0;
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}
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static int lp855x_write_byte(struct lp855x *lp, u8 reg, u8 data)
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{
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int ret;
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mutex_lock(&lp->xfer_lock);
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ret = i2c_smbus_write_byte_data(lp->client, reg, data);
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mutex_unlock(&lp->xfer_lock);
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return ret;
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}
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static bool lp855x_is_valid_rom_area(struct lp855x *lp, u8 addr)
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{
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u8 start, end;
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switch (lp->chip_id) {
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case LP8550:
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case LP8551:
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case LP8552:
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case LP8553:
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start = EEPROM_START;
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end = EEPROM_END;
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break;
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case LP8556:
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start = EPROM_START;
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end = EPROM_END;
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break;
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default:
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return false;
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}
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return (addr >= start && addr <= end);
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}
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static int lp855x_init_registers(struct lp855x *lp)
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{
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u8 val, addr;
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int i, ret;
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struct lp855x_platform_data *pd = lp->pdata;
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val = pd->initial_brightness;
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ret = lp855x_write_byte(lp, BRIGHTNESS_CTRL, val);
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if (ret)
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return ret;
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val = pd->device_control;
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ret = lp855x_write_byte(lp, DEVICE_CTRL, val);
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if (ret)
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return ret;
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if (pd->load_new_rom_data && pd->size_program) {
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for (i = 0; i < pd->size_program; i++) {
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addr = pd->rom_data[i].addr;
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val = pd->rom_data[i].val;
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if (!lp855x_is_valid_rom_area(lp, addr))
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continue;
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ret = lp855x_write_byte(lp, addr, val);
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if (ret)
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return ret;
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}
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}
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return ret;
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}
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static int lp855x_bl_update_status(struct backlight_device *bl)
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{
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struct lp855x *lp = bl_get_data(bl);
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enum lp855x_brightness_ctrl_mode mode = lp->pdata->mode;
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if (bl->props.state & BL_CORE_SUSPENDED)
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bl->props.brightness = 0;
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if (mode == PWM_BASED) {
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struct lp855x_pwm_data *pd = &lp->pdata->pwm_data;
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int br = bl->props.brightness;
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int max_br = bl->props.max_brightness;
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if (pd->pwm_set_intensity)
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pd->pwm_set_intensity(br, max_br);
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} else if (mode == REGISTER_BASED) {
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u8 val = bl->props.brightness;
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lp855x_write_byte(lp, BRIGHTNESS_CTRL, val);
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}
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return 0;
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}
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static int lp855x_bl_get_brightness(struct backlight_device *bl)
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{
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struct lp855x *lp = bl_get_data(bl);
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enum lp855x_brightness_ctrl_mode mode = lp->pdata->mode;
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if (mode == PWM_BASED) {
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struct lp855x_pwm_data *pd = &lp->pdata->pwm_data;
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int max_br = bl->props.max_brightness;
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if (pd->pwm_get_intensity)
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bl->props.brightness = pd->pwm_get_intensity(max_br);
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} else if (mode == REGISTER_BASED) {
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u8 val = 0;
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lp855x_read_byte(lp, BRIGHTNESS_CTRL, &val);
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bl->props.brightness = val;
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}
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return bl->props.brightness;
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}
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static const struct backlight_ops lp855x_bl_ops = {
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.options = BL_CORE_SUSPENDRESUME,
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.update_status = lp855x_bl_update_status,
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.get_brightness = lp855x_bl_get_brightness,
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};
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static int lp855x_backlight_register(struct lp855x *lp)
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{
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struct backlight_device *bl;
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struct backlight_properties props;
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struct lp855x_platform_data *pdata = lp->pdata;
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char *name = pdata->name ? : DEFAULT_BL_NAME;
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props.type = BACKLIGHT_PLATFORM;
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props.max_brightness = MAX_BRIGHTNESS;
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if (pdata->initial_brightness > props.max_brightness)
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pdata->initial_brightness = props.max_brightness;
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props.brightness = pdata->initial_brightness;
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bl = backlight_device_register(name, lp->dev, lp,
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&lp855x_bl_ops, &props);
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if (IS_ERR(bl))
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return PTR_ERR(bl);
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lp->bl = bl;
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return 0;
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}
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static void lp855x_backlight_unregister(struct lp855x *lp)
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{
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if (lp->bl)
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backlight_device_unregister(lp->bl);
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}
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static ssize_t lp855x_get_chip_id(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct lp855x *lp = dev_get_drvdata(dev);
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return scnprintf(buf, BUF_SIZE, "%s\n", lp->chipname);
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}
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static ssize_t lp855x_get_bl_ctl_mode(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct lp855x *lp = dev_get_drvdata(dev);
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enum lp855x_brightness_ctrl_mode mode = lp->pdata->mode;
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char *strmode = NULL;
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if (mode == PWM_BASED)
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strmode = "pwm based";
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else if (mode == REGISTER_BASED)
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strmode = "register based";
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return scnprintf(buf, BUF_SIZE, "%s\n", strmode);
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}
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static DEVICE_ATTR(chip_id, S_IRUGO, lp855x_get_chip_id, NULL);
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static DEVICE_ATTR(bl_ctl_mode, S_IRUGO, lp855x_get_bl_ctl_mode, NULL);
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static struct attribute *lp855x_attributes[] = {
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&dev_attr_chip_id.attr,
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&dev_attr_bl_ctl_mode.attr,
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NULL,
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};
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static const struct attribute_group lp855x_attr_group = {
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.attrs = lp855x_attributes,
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};
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static int lp855x_probe(struct i2c_client *cl, const struct i2c_device_id *id)
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{
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struct lp855x *lp;
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struct lp855x_platform_data *pdata = cl->dev.platform_data;
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enum lp855x_brightness_ctrl_mode mode;
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int ret;
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if (!pdata) {
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dev_err(&cl->dev, "no platform data supplied\n");
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return -EINVAL;
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}
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if (!i2c_check_functionality(cl->adapter, I2C_FUNC_SMBUS_I2C_BLOCK))
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return -EIO;
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lp = devm_kzalloc(&cl->dev, sizeof(struct lp855x), GFP_KERNEL);
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if (!lp)
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return -ENOMEM;
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mode = pdata->mode;
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lp->client = cl;
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lp->dev = &cl->dev;
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lp->pdata = pdata;
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lp->chipname = id->name;
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lp->chip_id = id->driver_data;
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i2c_set_clientdata(cl, lp);
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mutex_init(&lp->xfer_lock);
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ret = lp855x_init_registers(lp);
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if (ret) {
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dev_err(lp->dev, "i2c communication err: %d", ret);
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if (mode == REGISTER_BASED)
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goto err_dev;
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}
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ret = lp855x_backlight_register(lp);
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if (ret) {
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dev_err(lp->dev,
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"failed to register backlight. err: %d\n", ret);
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goto err_dev;
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}
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ret = sysfs_create_group(&lp->dev->kobj, &lp855x_attr_group);
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if (ret) {
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dev_err(lp->dev, "failed to register sysfs. err: %d\n", ret);
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goto err_sysfs;
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}
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backlight_update_status(lp->bl);
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return 0;
|
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err_sysfs:
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||||
lp855x_backlight_unregister(lp);
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err_dev:
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||||
return ret;
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||||
}
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static int __devexit lp855x_remove(struct i2c_client *cl)
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||||
{
|
||||
struct lp855x *lp = i2c_get_clientdata(cl);
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||||
|
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lp->bl->props.brightness = 0;
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backlight_update_status(lp->bl);
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sysfs_remove_group(&lp->dev->kobj, &lp855x_attr_group);
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||||
lp855x_backlight_unregister(lp);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct i2c_device_id lp855x_ids[] = {
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{"lp8550", LP8550},
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{"lp8551", LP8551},
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{"lp8552", LP8552},
|
||||
{"lp8553", LP8553},
|
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{"lp8556", LP8556},
|
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{ }
|
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};
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MODULE_DEVICE_TABLE(i2c, lp855x_ids);
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|
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static struct i2c_driver lp855x_driver = {
|
||||
.driver = {
|
||||
.name = "lp855x",
|
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},
|
||||
.probe = lp855x_probe,
|
||||
.remove = __devexit_p(lp855x_remove),
|
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.id_table = lp855x_ids,
|
||||
};
|
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|
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module_i2c_driver(lp855x_driver);
|
||||
|
||||
MODULE_DESCRIPTION("Texas Instruments LP855x Backlight driver");
|
||||
MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>");
|
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MODULE_LICENSE("GPL");
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|
|
@ -0,0 +1,131 @@
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/*
|
||||
* LP855x Backlight Driver
|
||||
*
|
||||
* Copyright (C) 2011 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 _LP855X_H
|
||||
#define _LP855X_H
|
||||
|
||||
#define BL_CTL_SHFT (0)
|
||||
#define BRT_MODE_SHFT (1)
|
||||
#define BRT_MODE_MASK (0x06)
|
||||
|
||||
/* Enable backlight. Only valid when BRT_MODE=10(I2C only) */
|
||||
#define ENABLE_BL (1)
|
||||
#define DISABLE_BL (0)
|
||||
|
||||
#define I2C_CONFIG(id) id ## _I2C_CONFIG
|
||||
#define PWM_CONFIG(id) id ## _PWM_CONFIG
|
||||
|
||||
/* DEVICE CONTROL register - LP8550 */
|
||||
#define LP8550_PWM_CONFIG (LP8550_PWM_ONLY << BRT_MODE_SHFT)
|
||||
#define LP8550_I2C_CONFIG ((ENABLE_BL << BL_CTL_SHFT) | \
|
||||
(LP8550_I2C_ONLY << BRT_MODE_SHFT))
|
||||
|
||||
/* DEVICE CONTROL register - LP8551 */
|
||||
#define LP8551_PWM_CONFIG LP8550_PWM_CONFIG
|
||||
#define LP8551_I2C_CONFIG LP8550_I2C_CONFIG
|
||||
|
||||
/* DEVICE CONTROL register - LP8552 */
|
||||
#define LP8552_PWM_CONFIG LP8550_PWM_CONFIG
|
||||
#define LP8552_I2C_CONFIG LP8550_I2C_CONFIG
|
||||
|
||||
/* DEVICE CONTROL register - LP8553 */
|
||||
#define LP8553_PWM_CONFIG LP8550_PWM_CONFIG
|
||||
#define LP8553_I2C_CONFIG LP8550_I2C_CONFIG
|
||||
|
||||
/* DEVICE CONTROL register - LP8556 */
|
||||
#define LP8556_PWM_CONFIG (LP8556_PWM_ONLY << BRT_MODE_SHFT)
|
||||
#define LP8556_COMB1_CONFIG (LP8556_COMBINED1 << BRT_MODE_SHFT)
|
||||
#define LP8556_I2C_CONFIG ((ENABLE_BL << BL_CTL_SHFT) | \
|
||||
(LP8556_I2C_ONLY << BRT_MODE_SHFT))
|
||||
#define LP8556_COMB2_CONFIG (LP8556_COMBINED2 << BRT_MODE_SHFT)
|
||||
|
||||
/* ROM area boundary */
|
||||
#define EEPROM_START (0xA0)
|
||||
#define EEPROM_END (0xA7)
|
||||
#define EPROM_START (0xA0)
|
||||
#define EPROM_END (0xAF)
|
||||
|
||||
enum lp855x_chip_id {
|
||||
LP8550,
|
||||
LP8551,
|
||||
LP8552,
|
||||
LP8553,
|
||||
LP8556,
|
||||
};
|
||||
|
||||
enum lp855x_brightness_ctrl_mode {
|
||||
PWM_BASED = 1,
|
||||
REGISTER_BASED,
|
||||
};
|
||||
|
||||
enum lp8550_brighntess_source {
|
||||
LP8550_PWM_ONLY,
|
||||
LP8550_I2C_ONLY = 2,
|
||||
};
|
||||
|
||||
enum lp8551_brighntess_source {
|
||||
LP8551_PWM_ONLY = LP8550_PWM_ONLY,
|
||||
LP8551_I2C_ONLY = LP8550_I2C_ONLY,
|
||||
};
|
||||
|
||||
enum lp8552_brighntess_source {
|
||||
LP8552_PWM_ONLY = LP8550_PWM_ONLY,
|
||||
LP8552_I2C_ONLY = LP8550_I2C_ONLY,
|
||||
};
|
||||
|
||||
enum lp8553_brighntess_source {
|
||||
LP8553_PWM_ONLY = LP8550_PWM_ONLY,
|
||||
LP8553_I2C_ONLY = LP8550_I2C_ONLY,
|
||||
};
|
||||
|
||||
enum lp8556_brightness_source {
|
||||
LP8556_PWM_ONLY,
|
||||
LP8556_COMBINED1, /* pwm + i2c before the shaper block */
|
||||
LP8556_I2C_ONLY,
|
||||
LP8556_COMBINED2, /* pwm + i2c after the shaper block */
|
||||
};
|
||||
|
||||
struct lp855x_pwm_data {
|
||||
void (*pwm_set_intensity) (int brightness, int max_brightness);
|
||||
int (*pwm_get_intensity) (int max_brightness);
|
||||
};
|
||||
|
||||
struct lp855x_rom_data {
|
||||
u8 addr;
|
||||
u8 val;
|
||||
};
|
||||
|
||||
/**
|
||||
* struct lp855x_platform_data
|
||||
* @name : Backlight driver name. If it is not defined, default name is set.
|
||||
* @mode : brightness control by pwm or lp855x register
|
||||
* @device_control : value of DEVICE CONTROL register
|
||||
* @initial_brightness : initial value of backlight brightness
|
||||
* @pwm_data : platform specific pwm generation functions.
|
||||
Only valid when mode is PWM_BASED.
|
||||
* @load_new_rom_data :
|
||||
0 : use default configuration data
|
||||
1 : update values of eeprom or eprom registers on loading driver
|
||||
* @size_program : total size of lp855x_rom_data
|
||||
* @rom_data : list of new eeprom/eprom registers
|
||||
*/
|
||||
struct lp855x_platform_data {
|
||||
char *name;
|
||||
enum lp855x_brightness_ctrl_mode mode;
|
||||
u8 device_control;
|
||||
int initial_brightness;
|
||||
struct lp855x_pwm_data pwm_data;
|
||||
u8 load_new_rom_data;
|
||||
int size_program;
|
||||
struct lp855x_rom_data *rom_data;
|
||||
};
|
||||
|
||||
#endif
|
||||
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