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Date: Thu, 13 Mar 2014 14:01:57 +0900
From: Daniel Jeong <gshark.jeong@...il.com>
To: Jingoo Han <jg1.han@...sung.com>
CC: linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org,
'Jean-Christophe Plagniol-Villard' <plagnioj@...osoft.com>,
'Tomi Valkeinen' <tomi.valkeinen@...com>,
'Bryan Wu' <cooloney@...il.com>,
'Lee Jones' <lee.jones@...aro.org>
Subject: Re: [PATCH] backlight: add new LP8860 backlight driver
Thank you for your comments
> On Monday, March 03, 2014 6:15 PM, Daniel Jeong wrote:
> (+CC Bryan Wu, Lee Jones)
>
> Please add Bryan Wu, Lee Jones to CC list, when you send
> patches for backlight.
>
>> This patch adds LP8860 backlight device driver.
>> LP8860 is a low EMI and High performance 4 channel LED Driver of TI.
>> This device driver provide the way to control brightness and currnet
> (+CC Bryan Wu, Lee Jones)
>
> s/provide/provides
> s/currnet/current
>
>> of each channel and provide the way to write eeprom.
> s/provide/provides
>
>> To support dt structure, another patch file will be sent.
>>
>> Signed-off-by: Daniel Jeong <gshark.jeong@...il.com>
>> ---
> 'To support dt structure, another patch file will be sent.' is
> NOT appropriate for the commit message. So, please move it as below.
> Then, this message will not be included to the commit message, when
> this patch will be merged to maintainer's tree.
>
> Signed-off-by: Daniel Jeong <gshark.jeong@...il.com>
> ---
> To support dt structure, another patch file will be sent.
>
>
>> drivers/video/backlight/Kconfig | 7 +
>> drivers/video/backlight/Makefile | 1 +
>> drivers/video/backlight/lp8860_bl.c | 528 +++++++++++++++++++++++++++++++
>> include/linux/platform_data/lp8860_bl.h | 54 ++++
>> 4 files changed, 590 insertions(+)
>> create mode 100644 drivers/video/backlight/lp8860_bl.c
>> create mode 100644 include/linux/platform_data/lp8860_bl.h
>>
>> diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
>> index 5a3eb2e..908048f 100644
>> --- a/drivers/video/backlight/Kconfig
>> +++ b/drivers/video/backlight/Kconfig
>> @@ -397,6 +397,13 @@ config BACKLIGHT_LP8788
>> help
>> This supports TI LP8788 backlight driver.
>>
>> +config BACKLIGHT_LP8860
>> + tristate "Backlight Driver for LP8860"
>> + depends on BACKLIGHT_CLASS_DEVICE && I2C
>> + select REGMAP_I2C
>> + help
>> + This supports TI LP8860 Backlight Driver
>> +
>> config BACKLIGHT_OT200
>> tristate "Backlight driver for ot200 visualisation device"
>> depends on BACKLIGHT_CLASS_DEVICE && CS5535_MFGPT && GPIO_CS5535
>> diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
>> index bb82002..cbc5ac3 100644
>> --- a/drivers/video/backlight/Makefile
>> +++ b/drivers/video/backlight/Makefile
>> @@ -42,6 +42,7 @@ obj-$(CONFIG_BACKLIGHT_LM3639) += lm3639_bl.o
>> obj-$(CONFIG_BACKLIGHT_LOCOMO) += locomolcd.o
>> obj-$(CONFIG_BACKLIGHT_LP855X) += lp855x_bl.o
>> obj-$(CONFIG_BACKLIGHT_LP8788) += lp8788_bl.o
>> +obj-$(CONFIG_BACKLIGHT_LP8860) += lp8860_bl.o
>> obj-$(CONFIG_BACKLIGHT_LV5207LP) += lv5207lp.o
>> obj-$(CONFIG_BACKLIGHT_MAX8925) += max8925_bl.o
>> obj-$(CONFIG_BACKLIGHT_OMAP1) += omap1_bl.o
>> diff --git a/drivers/video/backlight/lp8860_bl.c b/drivers/video/backlight/lp8860_bl.c
>> new file mode 100644
>> index 0000000..4712e84
>> --- /dev/null
>> +++ b/drivers/video/backlight/lp8860_bl.c
>> @@ -0,0 +1,528 @@
>> +/*
>> +* Simple driver for Texas Instruments lp8860 Backlight driver chip
>> +*
>> +* Copyright (C) 2014 Texas Instruments
>> +* Author: Daniel Jeong <gshark.jeong@...il.com>
>> +* Ldd Mlp <ldd-mlp@...t.ti.com>
>> +*
>> +* 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.
>> +*
>> +*/
>> +#include <linux/module.h>
> Please move this header in alphabetical order.
>
>> +#include <linux/backlight.h>
>> +#include <linux/delay.h>
>> +#include <linux/err.h>
>> +#include <linux/i2c.h>
>> +#include <linux/platform_data/lp8860_bl.h>
>> +#include <linux/regmap.h>
>> +#include <linux/slab.h>
>> +#include <linux/uaccess.h>
>> +
>> +#define REG_CL0_BRT_H 0x00
>> +#define REG_CL0_BRT_L 0x01
>> +#define REG_CL0_I_H 0x02
>> +#define REG_CL0_I_L 0x03
>> +
>> +#define REG_CL1_BRT_H 0x04
>> +#define REG_CL1_BRT_L 0x05
>> +#define REG_CL1_I 0x06
>> +
>> +#define REG_CL2_BRT_H 0x07
>> +#define REG_CL2_BRT_L 0x08
>> +#define REG_CL2_I 0x09
>> +
>> +#define REG_CL3_BRT_H 0x0a
>> +#define REG_CL3_BRT_L 0x0b
>> +#define REG_CL3_I 0x0c
>> +
>> +#define REG_CONF 0x0d
>> +#define REG_STATUS 0x0e
>> +#define REG_ID 0x12
>> +
>> +#define REG_ROM_CTRL 0x19
>> +#define REG_ROM_UNLOCK 0x1a
>> +#define REG_ROM_START 0x60
>> +#define REG_ROM_END 0x78
>> +
>> +#define REG_EEPROM_START 0x60
>> +#define REG_EEPROM_END 0x78
>> +#define REG_MAX 0xFF
>> +
>> +struct lp8860_chip {
>> + struct device *dev;
>> + struct lp8860_platform_data *pdata;
>> + struct backlight_device *bled[LP8860_LED_MAX];
>> + struct regmap *regmap;
>> +};
>> +
>> +/* brightness control */
>> +static int lp8860_bled_update_status(struct backlight_device *bl,
>> + enum lp8860_leds nsr)
>> +{
>> + int ret = -EINVAL;
>> + struct lp8860_chip *pchip = bl_get_data(bl);
>> +
>> + if (pchip->pdata->mode)
>> + return 0;
>> +
>> + if (bl->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
>> + bl->props.brightness = 0;
>> +
>> + switch (nsr) {
>> + case LP8860_LED0:
>> + ret = regmap_write(pchip->regmap,
>> + REG_CL0_BRT_H, bl->props.brightness >> 8);
>> + ret |= regmap_write(pchip->regmap,
>> + REG_CL0_BRT_L, bl->props.brightness & 0xff);
>> + break;
>> + case LP8860_LED1:
>> + ret = regmap_write(pchip->regmap,
>> + REG_CL1_BRT_H,
>> + (bl->props.brightness >> 8) & 0x1f);
>> + ret |=
>> + regmap_write(pchip->regmap, REG_CL1_BRT_L,
>> + bl->props.brightness & 0xff);
>> + break;
>> + case LP8860_LED2:
>> + ret = regmap_write(pchip->regmap,
>> + REG_CL2_BRT_H,
>> + (bl->props.brightness >> 8) & 0x1f);
>> + ret |=
>> + regmap_write(pchip->regmap, REG_CL2_BRT_L,
>> + bl->props.brightness & 0xff);
>> + break;
>> + case LP8860_LED3:
>> + ret = regmap_write(pchip->regmap,
>> + REG_CL3_BRT_H,
>> + (bl->props.brightness >> 8) & 0x1f);
>> + ret |=
>> + regmap_write(pchip->regmap, REG_CL3_BRT_L,
>> + bl->props.brightness & 0xff);
>> + break;
>> + default:
>> + BUG();
>> + }
>> + if (ret < 0)
>> + dev_err(pchip->dev, "fail : i2c access to register.\n");
>> + else
>> + ret = bl->props.brightness;
>> +
>> + return ret;
>> +}
>> +
>> +static int lp8860_bled_get_brightness(struct backlight_device *bl,
>> + enum lp8860_leds nsr)
>> +{
>> + struct lp8860_chip *pchip = bl_get_data(bl);
>> + unsigned int rval_h, rval_l;
>> + int ret = -EINVAL;
>> +
>> + switch (nsr) {
>> + case LP8860_LED0:
>> + ret = regmap_read(pchip->regmap, REG_CL0_BRT_H, &rval_h);
>> + ret |= regmap_read(pchip->regmap, REG_CL0_BRT_L, &rval_l);
>> + break;
>> + case LP8860_LED1:
>> + ret = regmap_read(pchip->regmap, REG_CL1_BRT_H, &rval_h);
>> + ret |= regmap_read(pchip->regmap, REG_CL1_BRT_L, &rval_l);
>> + break;
>> + case LP8860_LED2:
>> + ret = regmap_read(pchip->regmap, REG_CL2_BRT_H, &rval_h);
>> + ret |= regmap_read(pchip->regmap, REG_CL2_BRT_L, &rval_l);
>> + break;
>> + case LP8860_LED3:
>> + ret = regmap_read(pchip->regmap, REG_CL3_BRT_H, &rval_h);
>> + ret |= regmap_read(pchip->regmap, REG_CL3_BRT_L, &rval_l);
>> + break;
>> + default:
>> + BUG();
>> + }
>> + if (ret < 0) {
>> + dev_err(pchip->dev, "fail : i2c access to register.\n");
>> + return ret;
>> + }
>> + bl->props.brightness = (rval_h << 8) | rval_l;
>> + return bl->props.brightness;
>> +}
>> +
>> +static int lp8860_update_status_bled0(struct backlight_device *bl)
>> +{
>> + return lp8860_bled_update_status(bl, LP8860_LED0);
>> +}
>> +
>> +static int lp8860_get_brightness_bled0(struct backlight_device *bl)
>> +{
>> + return lp8860_bled_get_brightness(bl, LP8860_LED0);
>> +}
>> +
>> +static int lp8860_update_status_bled1(struct backlight_device *bl)
>> +{
>> + return lp8860_bled_update_status(bl, LP8860_LED1);
>> +}
>> +
>> +static int lp8860_get_brightness_bled1(struct backlight_device *bl)
>> +{
>> + return lp8860_bled_get_brightness(bl, LP8860_LED1);
>> +}
>> +
>> +static int lp8860_update_status_bled2(struct backlight_device *bl)
>> +{
>> + return lp8860_bled_update_status(bl, LP8860_LED2);
>> +}
>> +
>> +static int lp8860_get_brightness_bled2(struct backlight_device *bl)
>> +{
>> + return lp8860_bled_get_brightness(bl, LP8860_LED2);
>> +}
>> +
>> +static int lp8860_update_status_bled3(struct backlight_device *bl)
>> +{
>> + return lp8860_bled_update_status(bl, LP8860_LED3);
>> +}
>> +
>> +static int lp8860_get_brightness_bled3(struct backlight_device *bl)
>> +{
>> + return lp8860_bled_get_brightness(bl, LP8860_LED3);
>> +}
>> +
>> +#define lp8860_bled_ops(_id)\
>> +{\
>> + .options = BL_CORE_SUSPENDRESUME,\
>> + .update_status = lp8860_update_status_bled##_id,\
>> + .get_brightness = lp8860_get_brightness_bled##_id,\
>> +}
>> +
>> +static const struct backlight_ops lp8860_bled_ops[LP8860_LED_MAX] = {
>> + [LP8860_LED0] = lp8860_bled_ops(0),
>> + [LP8860_LED1] = lp8860_bled_ops(1),
>> + [LP8860_LED2] = lp8860_bled_ops(2),
>> + [LP8860_LED3] = lp8860_bled_ops(3),
>> +};
>> +
>> +/* current control */
>> +static int lp8860_set_current(struct device *dev,
>> + const char *buf, enum lp8860_leds nsr)
>> +{
>> + struct lp8860_chip *pchip = dev_get_drvdata(dev);
>> + unsigned int ival;
>> + ssize_t ret;
>> +
>> + ret = kstrtouint(buf, 10, &ival);
>> + if (ret)
>> + return ret;
>> +
>> + switch (nsr) {
>> + case LP8860_LED0:
>> + ival = min_t(unsigned int, ival, LP8860_LED0_BR_MAX);
>> + ret = regmap_write(pchip->regmap, REG_CL0_I_H, ival >> 8);
>> + ret |= regmap_write(pchip->regmap, REG_CL0_I_L, ival & 0xff);
>> + break;
>> + case LP8860_LED1:
>> + ival = min_t(unsigned int, ival, LP8860_LED1_BR_MAX);
>> + ret = regmap_write(pchip->regmap, REG_CL1_I, ival & 0xff);
>> + break;
>> + case LP8860_LED2:
>> + ival = min_t(unsigned int, ival, LP8860_LED2_BR_MAX);
>> + ret = regmap_write(pchip->regmap, REG_CL2_I, ival & 0xff);
>> + break;
>> + case LP8860_LED3:
>> + ival = min_t(unsigned int, ival, LP8860_LED3_BR_MAX);
>> + ret = regmap_write(pchip->regmap, REG_CL3_I, ival & 0xff);
>> + break;
>> + default:
>> + BUG();
>> + }
>> + if (ret < 0)
>> + dev_err(pchip->dev, "fail : i2c access error.\n");
>> +
>> + return ret;
>> +}
>> +
>> +static ssize_t lp8860_current_store_bled0(struct device *dev,
>> + struct device_attribute *devAttr,
>> + const char *buf, size_t size)
>> +{
>> + int ret;
>> +
>> + ret = lp8860_set_current(dev, buf, LP8860_LED0);
>> + if (ret < 0)
>> + return ret;
>> + return size;
>> +}
>> +
>> +static ssize_t lp8860_current_store_bled1(struct device *dev,
>> + struct device_attribute *devAttr,
>> + const char *buf, size_t size)
>> +{
>> + int ret;
>> +
>> + ret = lp8860_set_current(dev, buf, LP8860_LED1);
>> + if (ret < 0)
>> + return ret;
>> + return size;
>> +}
>> +
>> +static ssize_t lp8860_current_store_bled2(struct device *dev,
>> + struct device_attribute *devAttr,
>> + const char *buf, size_t size)
>> +{
>> + int ret;
>> +
>> + ret = lp8860_set_current(dev, buf, LP8860_LED2);
>> + if (ret < 0)
>> + return ret;
>> + return size;
>> +}
>> +
>> +static ssize_t lp8860_current_store_bled3(struct device *dev,
>> + struct device_attribute *devAttr,
>> + const char *buf, size_t size)
>> +{
>> + int ret;
>> +
>> + ret = lp8860_set_current(dev, buf, LP8860_LED3);
>> + if (ret < 0)
>> + return ret;
>> + return size;
>> +}
>> +
>> +#define lp8860_attr(_name, _show, _store)\
>> +{\
>> + .attr = {\
>> + .name = _name,\
>> + .mode = S_IWUSR,\
>> + },\
>> + .show = _show,\
>> + .store = _store,\
>> +}
>> +
>> +static struct device_attribute lp8860_dev_attr[LP8860_LED_MAX] = {
>> + [LP8860_LED0] = lp8860_attr("current", NULL,
>> + lp8860_current_store_bled0),
>> + [LP8860_LED1] = lp8860_attr("current", NULL,
>> + lp8860_current_store_bled1),
>> + [LP8860_LED2] = lp8860_attr("current", NULL,
>> + lp8860_current_store_bled2),
>> + [LP8860_LED3] = lp8860_attr("current", NULL,
>> + lp8860_current_store_bled3),
>> +};
>> +
>> +/*
>> + * eeprom write and readback to check.
>> + * eeprom register range is from 60h to 78h
>> + * buffer value to write data [reg] [data]
>> + * e.g) to change the register 0x60 value to 0xff
>> + * buffer value should be 60 ff
>> + */
>> +static ssize_t lp8860_eeprom_store(struct device *dev,
>> + struct device_attribute *devAttr,
>> + const char *buf, size_t size)
>> +{
>> + struct lp8860_chip *pchip = dev_get_drvdata(dev);
>> + unsigned int reg, data, rval;
>> + char *tok;
>> + int ret;
>> +
>> + /* register no. */
>> + tok = strsep((char **)&buf, " ,\n");
>> + if (tok == NULL)
>> + goto err_input;
>> + ret = kstrtouint(tok, 16, ®);
>> + if (ret)
>> + goto err_input;
>> +
>> + /* register value */
>> + tok = strsep((char **)&buf, " ,\n");
>> + if (tok == NULL)
>> + goto err_input;
>> + ret = kstrtouint(tok, 16, &data);
>> + if (ret)
>> + goto err_input;
>> + /*
>> + * EEPROM Programming sequence
>> + * (program data permanently from registers to NVM)
>> + * 1. Unlock EEPROM by writing
>> + * the unlock codes to register 1Ah(08, BA, EF)
>> + * 2. Write data to EEPROM registers (address 60h...78h)
>> + * 3. Write EE_PROG to 1 in address 19h. (02h to address 19h)
>> + * 4. Wait 100ms
> If possible, please add the reason why 100ms is necessary.
> 100ms is very huge delay.
These sequences are based on the datasheet.
>
>> + * 5. Write EE_PROG to 0 in address 19h. (00h to address 19h)
>> + */
>> + if (reg < REG_EEPROM_START || reg > REG_EEPROM_END || data > 0xff)
>> + goto err_input;
>> + ret = regmap_write(pchip->regmap, REG_ROM_UNLOCK, 0x08);
>> + ret |= regmap_write(pchip->regmap, REG_ROM_UNLOCK, 0xba);
>> + ret |= regmap_write(pchip->regmap, REG_ROM_UNLOCK, 0xef);
>> + ret |= regmap_write(pchip->regmap, reg, data);
>> + ret |= regmap_write(pchip->regmap, REG_ROM_CTRL, 0x02);
>> + msleep(100);
>> + ret |= regmap_write(pchip->regmap, REG_ROM_CTRL, 0x00);
>> + if (ret < 0)
>> + goto err_i2c;
>> +
>> + /* read back */
>> + ret = regmap_write(pchip->regmap, REG_ROM_UNLOCK, 0x08);
>> + ret |= regmap_write(pchip->regmap, REG_ROM_UNLOCK, 0xba);
>> + ret |= regmap_write(pchip->regmap, REG_ROM_UNLOCK, 0xef);
>> + ret |= regmap_write(pchip->regmap, REG_ROM_CTRL, 0x01);
>> + msleep(100);
>> + ret |= regmap_write(pchip->regmap, REG_ROM_CTRL, 0x00);
>> + ret |= regmap_read(pchip->regmap, reg, &rval);
>> + if (ret < 0)
>> + goto err_i2c;
>> + if (rval != data)
>> + dev_err(pchip->dev, "fail : eeprom did not change.\n");
>> +
>> + return size;
>> +
>> +err_i2c:
>> + dev_err(pchip->dev, "fail : i2c access error.\n");
>> + return ret;
>> +
>> +err_input:
>> + dev_err(pchip->dev, "fail : input fail.\n");
>> + return -EINVAL;
>> +}
>> +
>> +static DEVICE_ATTR(eeprom, S_IWUSR, NULL, lp8860_eeprom_store);
>> +
>> +/* backlight register and remove */
>> +static char *lp8860_bled_name[LP8860_LED_MAX] = {
>> + [LP8860_LED0] = "bled0",
>> + [LP8860_LED1] = "bled1",
>> + [LP8860_LED2] = "bled2",
>> + [LP8860_LED3] = "bled3",
>> +};
>> +
>> +static int lp8860_backlight_remove(struct lp8860_chip *pchip)
>> +{
>> + int icnt;
>> +
>> + device_remove_file(&(pchip->bled[0]->dev), &dev_attr_eeprom);
>> + for (icnt = LP8860_LED0; icnt < LP8860_LED_MAX; icnt++) {
>> + if (pchip->bled[icnt]) {
>> + backlight_device_unregister(pchip->bled[icnt]);
>> + device_remove_file(&(pchip->bled[icnt]->dev),
>> + &lp8860_dev_attr[icnt]);
>> + }
>> + }
>> + return 0;
>> +}
>> +
>> +static int lp8860_backlight_registers(struct lp8860_chip *pchip)
>> +{
>> + struct backlight_properties props;
>> + struct lp8860_platform_data *pdata = pchip->pdata;
>> + int icnt, ret;
>> +
>> + props.type = BACKLIGHT_RAW;
>> + for (icnt = LP8860_LED0; icnt < LP8860_LED_MAX; icnt++) {
>> + props.max_brightness = pdata->max_brt[icnt];
>> + pchip->bled[icnt] =
>> + backlight_device_register(lp8860_bled_name[icnt],
> devm_* functions will make the code simpler.
> Thus, please use devm_backlight_device_register(), instead of
> backlight_device_register().
>
>> + pchip->dev, pchip,
>> + &lp8860_bled_ops[icnt], &props);
>> + if (IS_ERR(pchip->bled[icnt])) {
>> + dev_err(pchip->dev, "fail : backlight register.\n");
>> + ret = PTR_ERR(pchip->bled[icnt]);
>> + goto err_out;
>> + }
>> +
>> + ret = device_create_file(&(pchip->bled[icnt]->dev),
>> + &lp8860_dev_attr[icnt]);
>> + if (ret < 0) {
>> + dev_err(pchip->dev, "fail : to add sysfs entries.\n");
>> + goto err_out;
>> + }
>> + }
>> + /* access eeprom */
>> + ret = device_create_file(&(pchip->bled[LP8860_LED0]->dev),
>> + &dev_attr_eeprom);
>> + if (ret < 0) {
>> + dev_err(pchip->dev, "fail : to add sysfs entries.\n");
>> + goto err_out;
>> + }
>> + return 0;
>> +
>> +err_out:
>> + lp8860_backlight_remove(pchip);
>> + return ret;
>> +}
>> +
>> +static const struct regmap_config lp8860_regmap = {
>> + .reg_bits = 8,
>> + .val_bits = 8,
>> + .max_register = REG_MAX,
>> +};
>> +
>> +static int lp8860_probe(struct i2c_client *client,
>> + const struct i2c_device_id *id)
>> +{
>> + struct lp8860_chip *pchip;
>> + struct lp8860_platform_data *pdata = dev_get_platdata(&client->dev);
>> + int ret, icnt;
>> +
>> + if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
>> + dev_err(&client->dev, "fail : i2c functionality check.\n");
>> + return -EOPNOTSUPP;
>> + }
>> +
>> + pchip = devm_kzalloc(&client->dev,
>> + sizeof(struct lp8860_chip), GFP_KERNEL);
>> + if (!pchip)
>> + return -ENOMEM;
>> + pchip->dev = &client->dev;
>> +
>> + pchip->regmap = devm_regmap_init_i2c(client, &lp8860_regmap);
>> + if (IS_ERR(pchip->regmap)) {
>> + ret = PTR_ERR(pchip->regmap);
>> + dev_err(pchip->dev, "fail : allocate i2c register map.\n");
>> + return ret;
>> + }
>> +
>> + if (pdata == NULL) {
>> + pdata = devm_kzalloc(pchip->dev,
>> + sizeof(struct lp8860_platform_data),
>> + GFP_KERNEL);
>> + if (pdata == NULL)
>> + return -ENOMEM;
>> + pdata->max_brt[LP8860_LED0] = 65535;
>> + for (icnt = LP8860_LED1; icnt < LP8860_LED_MAX; icnt++)
>> + pdata->max_brt[icnt] = 8191;
>> + pchip->pdata = pdata;
>> + } else {
>> + pchip->pdata = pdata;
>> + }
>> + i2c_set_clientdata(client, pchip);
>> + ret = lp8860_backlight_registers(pchip);
>> + return ret;
>> +}
>> +
>> +static int lp8860_remove(struct i2c_client *client)
>> +{
>> + return lp8860_backlight_remove(i2c_get_clientdata(client));
>> +}
>> +
>> +static const struct i2c_device_id lp8860_id[] = {
>> + {LP8860_NAME, 0},
>> + {}
>> +};
>> +
>> +MODULE_DEVICE_TABLE(i2c, lp8860_id);
>> +static struct i2c_driver lp8860_i2c_driver = {
>> + .driver = {
>> + .name = LP8860_NAME,
>> + },
> Fix the indent style as below.
>
> + },
>
>> + .probe = lp8860_probe,
>> + .remove = lp8860_remove,
>> + .id_table = lp8860_id,
>> +};
>> +
>> +module_i2c_driver(lp8860_i2c_driver);
>> +
>> +MODULE_DESCRIPTION("Texas Instruments LP8860 Backlight Driver");
>> +MODULE_AUTHOR("Daniel Jeong <gshark.jeong@...il.com>");
>> +MODULE_AUTHOR("Ldd Mlp <ldd-mlp@...t.ti.com>");
>> +MODULE_LICENSE("GPL v2");
>> diff --git a/include/linux/platform_data/lp8860_bl.h b/include/linux/platform_data/lp8860_bl.h
>> new file mode 100644
>> index 0000000..61bd0f5
>> --- /dev/null
>> +++ b/include/linux/platform_data/lp8860_bl.h
>> @@ -0,0 +1,54 @@
>> +/*
>> + * Simple driver for Texas Instruments LM3642 LED Flash driver chip
>> + * Copyright (C) 2014 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_LP8860_H
>> +#define __LINUX_LP8860_H
> Prefix 'LINUX' looks redundant.
> Please replace '__LINUX_LP8860_H' with '__LP8860_H'.
>
> If the datasheet of 'lp8860' is not closed, please let us
> know where the datasheet is. It would be helpful for reviewing
> your patch.
Officially the datasheet will be opened next month but as of now I can't open it.
> Best regards,
> Jingoo Han
>
>> +
>> +#define LP8860_NAME "lp8860"
>> +#define LP8860_ADDR 0x2d
>> +
>> +#define LP8860_LED0_BR_MAX 65535
>> +#define LP8860_LED1_BR_MAX 8191
>> +#define LP8860_LED2_BR_MAX 8191
>> +#define LP8860_LED3_BR_MAX 8191
>> +
>> +#define LP8860_LED0_I_MAX 4095
>> +#define LP8860_LED1_I_MAX 255
>> +#define LP8860_LED2_I_MAX 255
>> +#define LP8860_LED3_I_MAX 255
>> +
>> +enum lp8860_leds {
>> + LP8860_LED0 = 0,
>> + LP8860_LED1,
>> + LP8860_LED2,
>> + LP8860_LED3,
>> + LP8860_LED_MAX
>> +};
>> +
>> +enum lp8860_ctrl_mode {
>> + LP8860_CTRL_I2C = 0,
>> + LP8860_CTRL_I2C_PWM,
>> +};
>> +
>> +/* struct lp8860 platform data
>> + * @mode : control mode
>> + * @max_brt : maximum brightness.
>> + * LED0 0 ~ 65535
>> + * LED1 0 ~ 8191
>> + * LED2 0 ~ 8191
>> + * LED3 0 ~ 8191
>> + */
>> +struct lp8860_platform_data {
>> +
>> + enum lp8860_ctrl_mode mode;
>> + int max_brt[LP8860_LED_MAX];
>> +};
>> +
>> +#endif /* __LINUX_LP8860_H */
>> --
>> 1.7.9.5
--
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