From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755819AbaJHBEE (ORCPT ); Tue, 7 Oct 2014 21:04:04 -0400 Received: from mailout3.samsung.com ([203.254.224.33]:35186 "EHLO mailout3.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755726AbaJHBEA (ORCPT ); Tue, 7 Oct 2014 21:04:00 -0400 X-AuditID: cbfee68d-f79296d000004278-9a-54348d7d9dce From: Jingoo Han To: "'Gyungoh Yoo'" Cc: "'Bryan Wu'" , "'Lee Jones'" , "'Jean-Christophe Plagniol-Villard'" , "'Tomi Valkeinen'" , "'Grant Likely'" , "'Rob Herring'" , linux-kernel@vger.kernel.org, linux-fbdev@vger.kernel.org, devicetree@vger.kernel.org, "'Gyungoh Yoo '" , "'Jingoo Han'" References: <1412657745-7812-1-git-send-email-jack.yoo@skyworksinc.com> <1412658075-7929-1-git-send-email-jack.yoo@skyworksinc.com> In-reply-to: <1412658075-7929-1-git-send-email-jack.yoo@skyworksinc.com> Subject: Re: [RESUBMIT PATCH v3 2/8] backlight: Add support Skyworks SKY81452 backlight driver Date: Wed, 08 Oct 2014 10:03:57 +0900 Message-id: <008e01cfe293$bcd6fe30$3684fa90$%han@samsung.com> MIME-version: 1.0 Content-type: text/plain; charset=us-ascii Content-transfer-encoding: 7bit X-Mailer: Microsoft Office Outlook 12.0 Thread-index: Ac/h68EVz/70WT65Tmq0AALnlwdh6AAppZcQ Content-language: ko X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFnrLIsWRmVeSWpSXmKPExsVy+t8zA93aXpMQg7krtC2O7pzIZDH/yDlW iwN/djBa7LwRanG15T6LxeWFl1gt7n89ymhxou8Dq8XlXXPYLNY9fMFk0br3CLvF+vm32Bx4 PHbOusvu8erCHRaPTas62TzuXNvD5tG3ZRWjx8qF39k8jt/YzuTxeZNcAEcUl01Kak5mWWqR vl0CV8aszrfsBc/TK463trM1MK4I6WLk5JAQMJH4+eU8M4QtJnHh3nq2LkYuDiGBZYwSt688 Zuli5AArOroPrEZIYDqjxK3WQIia34wSi87+ZwNJsAmoSXz5cpgdxBYRUJV4t20PC0gRs8Ba Zonp7XdZIbpbGSXOTigFsTkFPCQ+busFaxAWSJCYdOALE4jNAtR88+BzsG28ArYSTe92Q9mC Ej8m32MBsZkFtCTW7zzOBGHLS2xe85YZ4lB1iUd/dSFuMJL4fASilVlARGLfi3eMIPdICCzk kLh3tYcdYpeAxLfJh6CelJXYdAAaEJISB1fcYJnAKDELyeZZSDbPQrJ5FpIVCxhZVjGKphYk FxQnpRcZ6hUn5haX5qXrJefnbmKEpILeHYy3D1gfYhTgYFTi4TVoNgkRYk0sK67MPcRoCnTR RGYp0eR8YMLJK4k3NDYzsjA1MTU2Mrc0UxLnVZT6GSwkkJ5YkpqdmlqQWhRfVJqTWnyIkYmD U6qBUeOQ7tEpkzTnrXF5vt2rYXnO4n/Xg8QkGIreysScTD2qsSP+lvjD6sOnhZ39byru6t14 rTqj/JUcQ9vvn49z7I6/Oblg606PiZ/lPkrsrZ7WefWO5OvoyuutS5Td/BPWzfXbMHPzyWmn pD/8iQsJ9z1hMmfOF7Vag9sBy9adrTX7+3D6sbpuxc9KLMUZiYZazEXFiQDrBeqxAAMAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFtrOKsWRmVeSWpSXmKPExsVy+t9jQd3aXpMQgwfvVSyO7pzIZDH/yDlW iwN/djBa7LwRanG15T6LxeWFl1gt7n89ymhxou8Dq8XlXXPYLNY9fMFk0br3CLvF+vm32Bx4 PHbOusvu8erCHRaPTas62TzuXNvD5tG3ZRWjx8qF39k8jt/YzuTxeZNcAEdUA6NNRmpiSmqR Qmpecn5KZl66rZJ3cLxzvKmZgaGuoaWFuZJCXmJuqq2Si0+ArltmDtC5SgpliTmlQKGAxOJi JX07TBNCQ9x0LWAaI3R9Q4LgeowM0EDCOsaMWZ1v2Quep1ccb21na2BcEdLFyMEhIWAicXQf cxcjJ5ApJnHh3no2EFtIYDqjxK3WwC5GLiD7N6PEorP/wRJsAmoSX74cZgexRQRUJd5t28MC UsQssJZZYnr7XVaI7lZGibMTSkFsTgEPiY/besEahAUSJCYd+MIEYrMANd88+BxsM6+ArUTT u91QtqDEj8n3WEBsZgEtifU7jzNB2PISm9e8ZYY4Wl3i0V9diBuMJD4fgWhlFhCR2PfiHeME RqFZSCbNQjJpFpJJs5C0LGBkWcUomlqQXFCclJ5rpFecmFtcmpeul5yfu4kRnGieSe9gXNVg cYhRgINRiYfXoNkkRIg1say4MvcQowQHs5IIb2Q0UIg3JbGyKrUoP76oNCe1+BCjKdCjE5ml RJPzgUkwryTe0NjEzMjSyMzCyMTcXEmc92CrdaCQQHpiSWp2ampBahFMHxMHp1QD44S/fXn/ HzHf+9/3pM3uxey5Z7wfLHgYUJix2ujmBrfvBpwl+4r6A3b3cTCxTNxmOqfx/tnTVt5xilNF 9+25p7Zk0eH9GTuvyDrzfLjsdjLb8Vyxweu5GnINJ17IBXhcVzN9MMXw/jTTm6ePee5QbHDp XBvz7baeUen5c8+Yz11aW7XGs7LW7aMSS3FGoqEWc1FxIgD4K0l7SgMAAA== DLP-Filter: Pass X-MTR: 20000000000000000@CPGS X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tuesday, October 07, 2014 2:01 PM, Gyungoh Yoo wrote: > If possible, please add more detailed commit message for this patch. > Signed-off-by: Gyungoh Yoo > --- > drivers/video/backlight/Kconfig | 10 + > drivers/video/backlight/Makefile | 1 + > drivers/video/backlight/sky81452-backlight.c | 347 +++++++++++++++++++++++++++ > 3 files changed, 358 insertions(+) > create mode 100644 drivers/video/backlight/sky81452-backlight.c > > diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig > index 8d03924..2586fdd 100644 > --- a/drivers/video/backlight/Kconfig > +++ b/drivers/video/backlight/Kconfig > @@ -409,6 +409,16 @@ config BACKLIGHT_PANDORA > If you have a Pandora console, say Y to enable the > backlight driver. > > +config BACKLIGHT_SKY81452 > + tristate "Backlight driver for SKY81452" > + depends on BACKLIGHT_CLASS_DEVICE && MFD_SKY81452 > + help > + If you have a Skyworks SKY81452, say Y to enable the > + backlight driver. > + > + To compile this driver as a module, choose M here: the module will > + be called sky81452-backlight > + > config BACKLIGHT_TPS65217 > tristate "TPS65217 Backlight" > depends on BACKLIGHT_CLASS_DEVICE && MFD_TPS65217 > diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile > index fcd50b73..d67073f 100644 > --- a/drivers/video/backlight/Makefile > +++ b/drivers/video/backlight/Makefile > @@ -50,6 +50,7 @@ obj-$(CONFIG_BACKLIGHT_PANDORA) += pandora_bl.o > obj-$(CONFIG_BACKLIGHT_PCF50633) += pcf50633-backlight.o > obj-$(CONFIG_BACKLIGHT_PWM) += pwm_bl.o > obj-$(CONFIG_BACKLIGHT_SAHARA) += kb3886_bl.o > +obj-$(CONFIG_BACKLIGHT_SKY81452) += sky81452-backlight.o > obj-$(CONFIG_BACKLIGHT_TOSA) += tosa_bl.o > obj-$(CONFIG_BACKLIGHT_TPS65217) += tps65217_bl.o > obj-$(CONFIG_BACKLIGHT_WM831X) += wm831x_bl.o > diff --git a/drivers/video/backlight/sky81452-backlight.c b/drivers/video/backlight/sky81452- > backlight.c > new file mode 100644 > index 0000000..101399d > --- /dev/null > +++ b/drivers/video/backlight/sky81452-backlight.c > @@ -0,0 +1,347 @@ > +/* > + * sky81452-backlight.c SKY81452 backlight driver > + * > + * Copyright 2014 Skyworks Solutions Inc. > + * Author : Gyungoh Yoo > + * > + * This program is free software; you can redistribute it and/or modify it > + * under the terms of the GNU General Public License as published by the > + * Free Software Foundation; either version 2, or (at your option) any > + * later version. > + * > + * This program is distributed in the hope that it will be useful, but > + * WITHOUT ANY WARRANTY; without even the implied warranty of > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU > + * General Public License for more details. > + * > + * You should have received a copy of the GNU General Public License along > + * with this program; if not, see . > + */ > + > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include Please, re-order these headers alphabetically. It enhances the readability. > + > +/* registers */ > +#define SKY81452_REG0 0x00 > +#define SKY81452_REG1 0x01 > +#define SKY81452_REG2 0x02 > +#define SKY81452_REG4 0x04 > +#define SKY81452_REG5 0x05 > + > +/* bit mask */ > +#define SKY81452_CS 0xFF > +#define SKY81452_EN 0x3F > +#define SKY81452_IGPW 0x20 > +#define SKY81452_PWMMD 0x10 > +#define SKY81452_PHASE 0x08 > +#define SKY81452_ILIM 0x04 > +#define SKY81452_VSHRT 0x03 > +#define SKY81452_OCP 0x80 > +#define SKY81452_OTMP 0x40 > +#define SKY81452_SHRT 0x3F > +#define SKY81452_OPN 0x3F > + > +#define SKY81452_DEFAULT_NAME "lcd-backlight" > +#define SKY81452_MAX_BRIGHTNESS (SKY81452_CS + 1) > + > +#define CTZ(b) __builtin_ctz(b) > + > +static int sky81452_bl_update_status(struct backlight_device *bd) > +{ > + const struct sky81452_bl_platform_data *pdata = > + dev_get_platdata(bd->dev.parent); > + const unsigned int brightness = (unsigned int)bd->props.brightness; > + struct regmap *regmap = bl_get_data(bd); > + int ret; > + > + if (brightness > 0) { > + ret = regmap_write(regmap, SKY81452_REG0, brightness - 1); > + if (IS_ERR_VALUE(ret)) > + return ret; > + > + return regmap_update_bits(regmap, SKY81452_REG1, SKY81452_EN, > + pdata->enable << CTZ(SKY81452_EN)); > + } > + > + return regmap_update_bits(regmap, SKY81452_REG1, SKY81452_EN, 0); > +} > + > +static int sky81452_bl_get_brightness(struct backlight_device *bd) > +{ > + return bd->props.brightness; > +} > + > +static const struct backlight_ops sky81452_bl_ops = { > + .update_status = sky81452_bl_update_status, > + .get_brightness = sky81452_bl_get_brightness, > +}; > + > +static ssize_t sky81452_bl_store_enable(struct device *dev, > + struct device_attribute *attr, const char *buf, size_t count) > +{ > + struct regmap *regmap = bl_get_data(to_backlight_device(dev)); > + unsigned long value; > + int ret; > + > + ret = kstrtoul(buf, 16, &value); > + if (IS_ERR_VALUE(ret)) > + return ret; > + > + ret = regmap_update_bits(regmap, SKY81452_REG1, SKY81452_EN, > + value << CTZ(SKY81452_EN)); > + if (IS_ERR_VALUE(ret)) > + return ret; > + > + return count; > +} > + > +static ssize_t sky81452_bl_show_open_short(struct device *dev, > + struct device_attribute *attr, char *buf) > +{ > + struct regmap *regmap = bl_get_data(to_backlight_device(dev)); > + unsigned int reg, value = 0; > + char tmp[3]; > + int i, ret; > + > + reg = !strcmp(attr->attr.name, "open") ? SKY81452_REG5 : SKY81452_REG4; > + ret = regmap_read(regmap, reg, &value); > + if (IS_ERR_VALUE(ret)) > + return ret; > + > + if (value & SKY81452_SHRT) { > + *buf = 0; > + for (i = 0; i < 6; i++) { > + if (value & 0x01) { > + sprintf(tmp, "%d ", i + 1); > + strcat(buf, tmp); > + } > + value >>= 1; > + } > + strcat(buf, "\n"); > + } else > + strcpy(buf, "none\n"); Please add braces to 'else' statement. If only one branch of a conditional statement is a single statement. Braces are needed. if () { ... (multi lines) } else { ... } > + > + return strlen(buf); > +} > + > +static ssize_t sky81452_bl_show_fault(struct device *dev, > + struct device_attribute *attr, char *buf) > +{ > + struct regmap *regmap = bl_get_data(to_backlight_device(dev)); > + unsigned int value = 0; > + int ret; > + > + ret = regmap_read(regmap, SKY81452_REG4, &value); > + if (IS_ERR_VALUE(ret)) > + return ret; > + > + *buf = 0; > + > + if (value & SKY81452_OCP) > + strcat(buf, "over-current "); > + > + if (value & SKY81452_OTMP) > + strcat(buf, "over-temperature"); > + > + strcat(buf, "\n"); > + return strlen(buf); > +} > + > +static DEVICE_ATTR(enable, S_IWGRP | S_IWUSR, NULL, sky81452_bl_store_enable); > +static DEVICE_ATTR(open, S_IRUGO, sky81452_bl_show_open_short, NULL); > +static DEVICE_ATTR(short, S_IRUGO, sky81452_bl_show_open_short, NULL); > +static DEVICE_ATTR(fault, S_IRUGO, sky81452_bl_show_fault, NULL); > + > +static struct attribute *sky81452_bl_attribute[] = { > + &dev_attr_enable.attr, > + &dev_attr_open.attr, > + &dev_attr_short.attr, > + &dev_attr_fault.attr, > + NULL > +}; > + > +static const struct attribute_group sky81452_bl_attr_group = { > + .attrs = sky81452_bl_attribute, > +}; > + > +#ifdef CONFIG_OF > +static struct sky81452_bl_platform_data *sky81452_bl_parse_dt( > + struct device *dev) > +{ > + struct device_node *np = of_node_get(dev->of_node); > + struct sky81452_bl_platform_data *pdata; > + int ret; > + > + if (!np) { > + dev_err(dev, "backlight node not found"); > + return ERR_PTR(-ENODATA); > + } > + > + pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); > + if (!pdata) { > + of_node_put(np); > + return ERR_PTR(-ENOMEM); > + } > + > + of_property_read_string(np, "name", &pdata->name); > + pdata->ignore_pwm = of_property_read_bool(np, "ignore-pwm"); > + pdata->dpwm_mode = of_property_read_bool(np, "dpwm-mode"); > + pdata->phase_shift = of_property_read_bool(np, "phase-shift"); > + > + pdata->gpio_enable = of_get_named_gpio(np, "gpio-enable", 0); > + if (IS_ERR_VALUE(pdata->gpio_enable)) > + pdata->gpio_enable = -1; > + > + ret = of_property_read_u32(np, "enable", &pdata->enable); > + if (IS_ERR_VALUE(ret)) > + pdata->enable = SKY81452_EN >> CTZ(SKY81452_EN); > + > + ret = of_property_read_u32(np, "short-detection-threshold", > + &pdata->short_detection_threshold); > + if (IS_ERR_VALUE(ret)) > + pdata->short_detection_threshold = 7; > + > + ret = of_property_read_u32(np, "boost-current-limit", > + &pdata->boost_current_limit); > + if (IS_ERR_VALUE(ret)) > + pdata->boost_current_limit = 2750; > + > + of_node_put(np); > + return pdata; > +} > +#else > +static struct sky81452_bl_platform_data *sky81452_bl_parse_dt( > + struct device *dev) > +{ > + return ERR_PTR(-EINVAL); > +} > +#endif > + > +static int sky81452_bl_init_device(struct regmap *regmap, > + struct sky81452_bl_platform_data *pdata) > +{ > + unsigned int value; > + > + value = pdata->ignore_pwm ? SKY81452_IGPW : 0; > + value |= pdata->dpwm_mode ? SKY81452_PWMMD : 0; > + value |= pdata->phase_shift ? 0 : SKY81452_PHASE; > + > + if (pdata->boost_current_limit == 2300) > + value |= SKY81452_ILIM; > + else if (pdata->boost_current_limit != 2720) > + return -EINVAL; > + > + if (pdata->short_detection_threshold < 4 || > + pdata->short_detection_threshold > 7) > + return -EINVAL; > + value |= (7 - pdata->short_detection_threshold) << CTZ(SKY81452_VSHRT); > + > + return regmap_write(regmap, SKY81452_REG2, value); > +} > + > +static int sky81452_bl_probe(struct platform_device *pdev) > +{ > + struct device *dev = &pdev->dev; > + struct regmap *regmap = dev_get_drvdata(dev->parent); > + struct sky81452_bl_platform_data *pdata = dev_get_platdata(dev); > + struct backlight_device *bd; > + struct backlight_properties props; > + const char *name; > + int ret; > + > + if (!pdata) { > + pdata = sky81452_bl_parse_dt(dev); > + if (IS_ERR(pdata)) > + return PTR_ERR(pdata); > + } > + > + if (pdata->gpio_enable >= 0) { > + ret = devm_gpio_request_one(dev, pdata->gpio_enable, > + GPIOF_OUT_INIT_HIGH, "sky81452-en"); > + if (IS_ERR_VALUE(ret)) { > + dev_err(dev, "failed to request GPIO. err=%d", ret); > + return ret; > + } > + } > + > + ret = sky81452_bl_init_device(regmap, pdata); > + if (IS_ERR_VALUE(ret)) { > + dev_err(dev, "failed to initialize. err=%d", ret); > + return ret; > + } > + > + memset(&props, 0, sizeof(props)); > + props.max_brightness = SKY81452_MAX_BRIGHTNESS, > + name = pdata->name ? pdata->name : SKY81452_DEFAULT_NAME; > + bd = devm_backlight_device_register(dev, name, dev, regmap, > + &sky81452_bl_ops, &props); > + if (IS_ERR(bd)) { > + dev_err(dev, "failed to register. err=%ld", PTR_ERR(bd)); > + return PTR_ERR(bd); > + } > + > + platform_set_drvdata(pdev, bd); > + > + ret = sysfs_create_group(&bd->dev.kobj, &sky81452_bl_attr_group); > + if (IS_ERR_VALUE(ret)) { > + dev_err(dev, "failed to create attribute. err=%d", ret); > + goto err; > + } > + > + return ret; > +err: > + backlight_device_unregister(bd); This backlight_device_unregister() is NOT necessary. This is because backlight_device_unregister will be called automatically, when devm_backlight_device_register() is used and error returns. > + return ret; > +} > + > +static int sky81452_bl_remove(struct platform_device *pdev) > +{ > + const struct sky81452_bl_platform_data *pdata = > + dev_get_platdata(&pdev->dev); > + struct backlight_device *bd = platform_get_drvdata(pdev); > + > + sysfs_remove_group(&bd->dev.kobj, &sky81452_bl_attr_group); > + > + bd->props.power = FB_BLANK_UNBLANK; > + bd->props.brightness = 0; > + backlight_update_status(bd); > + > + if (pdata->gpio_enable >= 0) > + gpio_set_value_cansleep(pdata->gpio_enable, 0); > + > + return 0; > +} > + > +#ifdef CONFIG_OF > +static const struct of_device_id sky81452_bl_of_match[] = { > + { .compatible = "skyworks,sky81452-backlight", }, > + { } > +}; > +MODULE_DEVICE_TABLE(of, sky81452_bl_of_match); > +#endif > + > +static struct platform_driver sky81452_bl_driver = { > + .driver = { > + .name = "sky81452-backlight", > + .of_match_table = of_match_ptr(sky81452_bl_of_match), > + }, > + .probe = sky81452_bl_probe, > + .remove = sky81452_bl_remove, > +}; > + > +module_platform_driver(sky81452_bl_driver); > + > +MODULE_DESCRIPTION("Skyworks SKY81452 backlight driver"); > +MODULE_AUTHOR("Gyungoh Yoo "); > +MODULE_LICENSE("GPL"); How about using 'GPL v2'? > +MODULE_VERSION("1.2"); > -- > 1.9.1 From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jingoo Han Subject: Re: [RESUBMIT PATCH v3 2/8] backlight: Add support Skyworks SKY81452 backlight driver Date: Wed, 08 Oct 2014 10:03:57 +0900 Message-ID: <008e01cfe293$bcd6fe30$3684fa90$%han@samsung.com> References: <1412657745-7812-1-git-send-email-jack.yoo@skyworksinc.com> <1412658075-7929-1-git-send-email-jack.yoo@skyworksinc.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Return-path: In-reply-to: <1412658075-7929-1-git-send-email-jack.yoo-tjhQNA90jdKqndwCJWfcng@public.gmane.org> Content-language: ko Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: 'Gyungoh Yoo' Cc: 'Bryan Wu' , 'Lee Jones' , 'Jean-Christophe Plagniol-Villard' , 'Tomi Valkeinen' , 'Grant Likely' , 'Rob Herring' , linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-fbdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, 'Gyungoh Yoo ' , 'Jingoo Han' List-Id: devicetree@vger.kernel.org On Tuesday, October 07, 2014 2:01 PM, Gyungoh Yoo wrote: > If possible, please add more detailed commit message for this patch. > Signed-off-by: Gyungoh Yoo > --- > drivers/video/backlight/Kconfig | 10 + > drivers/video/backlight/Makefile | 1 + > drivers/video/backlight/sky81452-backlight.c | 347 +++++++++++++++++++++++++++ > 3 files changed, 358 insertions(+) > create mode 100644 drivers/video/backlight/sky81452-backlight.c > > diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig > index 8d03924..2586fdd 100644 > --- a/drivers/video/backlight/Kconfig > +++ b/drivers/video/backlight/Kconfig > @@ -409,6 +409,16 @@ config BACKLIGHT_PANDORA > If you have a Pandora console, say Y to enable the > backlight driver. > > +config BACKLIGHT_SKY81452 > + tristate "Backlight driver for SKY81452" > + depends on BACKLIGHT_CLASS_DEVICE && MFD_SKY81452 > + help > + If you have a Skyworks SKY81452, say Y to enable the > + backlight driver. > + > + To compile this driver as a module, choose M here: the module will > + be called sky81452-backlight > + > config BACKLIGHT_TPS65217 > tristate "TPS65217 Backlight" > depends on BACKLIGHT_CLASS_DEVICE && MFD_TPS65217 > diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile > index fcd50b73..d67073f 100644 > --- a/drivers/video/backlight/Makefile > +++ b/drivers/video/backlight/Makefile > @@ -50,6 +50,7 @@ obj-$(CONFIG_BACKLIGHT_PANDORA) += pandora_bl.o > obj-$(CONFIG_BACKLIGHT_PCF50633) += pcf50633-backlight.o > obj-$(CONFIG_BACKLIGHT_PWM) += pwm_bl.o > obj-$(CONFIG_BACKLIGHT_SAHARA) += kb3886_bl.o > +obj-$(CONFIG_BACKLIGHT_SKY81452) += sky81452-backlight.o > obj-$(CONFIG_BACKLIGHT_TOSA) += tosa_bl.o > obj-$(CONFIG_BACKLIGHT_TPS65217) += tps65217_bl.o > obj-$(CONFIG_BACKLIGHT_WM831X) += wm831x_bl.o > diff --git a/drivers/video/backlight/sky81452-backlight.c b/drivers/video/backlight/sky81452- > backlight.c > new file mode 100644 > index 0000000..101399d > --- /dev/null > +++ b/drivers/video/backlight/sky81452-backlight.c > @@ -0,0 +1,347 @@ > +/* > + * sky81452-backlight.c SKY81452 backlight driver > + * > + * Copyright 2014 Skyworks Solutions Inc. > + * Author : Gyungoh Yoo > + * > + * This program is free software; you can redistribute it and/or modify it > + * under the terms of the GNU General Public License as published by the > + * Free Software Foundation; either version 2, or (at your option) any > + * later version. > + * > + * This program is distributed in the hope that it will be useful, but > + * WITHOUT ANY WARRANTY; without even the implied warranty of > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU > + * General Public License for more details. > + * > + * You should have received a copy of the GNU General Public License along > + * with this program; if not, see . > + */ > + > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include Please, re-order these headers alphabetically. It enhances the readability. > + > +/* registers */ > +#define SKY81452_REG0 0x00 > +#define SKY81452_REG1 0x01 > +#define SKY81452_REG2 0x02 > +#define SKY81452_REG4 0x04 > +#define SKY81452_REG5 0x05 > + > +/* bit mask */ > +#define SKY81452_CS 0xFF > +#define SKY81452_EN 0x3F > +#define SKY81452_IGPW 0x20 > +#define SKY81452_PWMMD 0x10 > +#define SKY81452_PHASE 0x08 > +#define SKY81452_ILIM 0x04 > +#define SKY81452_VSHRT 0x03 > +#define SKY81452_OCP 0x80 > +#define SKY81452_OTMP 0x40 > +#define SKY81452_SHRT 0x3F > +#define SKY81452_OPN 0x3F > + > +#define SKY81452_DEFAULT_NAME "lcd-backlight" > +#define SKY81452_MAX_BRIGHTNESS (SKY81452_CS + 1) > + > +#define CTZ(b) __builtin_ctz(b) > + > +static int sky81452_bl_update_status(struct backlight_device *bd) > +{ > + const struct sky81452_bl_platform_data *pdata = > + dev_get_platdata(bd->dev.parent); > + const unsigned int brightness = (unsigned int)bd->props.brightness; > + struct regmap *regmap = bl_get_data(bd); > + int ret; > + > + if (brightness > 0) { > + ret = regmap_write(regmap, SKY81452_REG0, brightness - 1); > + if (IS_ERR_VALUE(ret)) > + return ret; > + > + return regmap_update_bits(regmap, SKY81452_REG1, SKY81452_EN, > + pdata->enable << CTZ(SKY81452_EN)); > + } > + > + return regmap_update_bits(regmap, SKY81452_REG1, SKY81452_EN, 0); > +} > + > +static int sky81452_bl_get_brightness(struct backlight_device *bd) > +{ > + return bd->props.brightness; > +} > + > +static const struct backlight_ops sky81452_bl_ops = { > + .update_status = sky81452_bl_update_status, > + .get_brightness = sky81452_bl_get_brightness, > +}; > + > +static ssize_t sky81452_bl_store_enable(struct device *dev, > + struct device_attribute *attr, const char *buf, size_t count) > +{ > + struct regmap *regmap = bl_get_data(to_backlight_device(dev)); > + unsigned long value; > + int ret; > + > + ret = kstrtoul(buf, 16, &value); > + if (IS_ERR_VALUE(ret)) > + return ret; > + > + ret = regmap_update_bits(regmap, SKY81452_REG1, SKY81452_EN, > + value << CTZ(SKY81452_EN)); > + if (IS_ERR_VALUE(ret)) > + return ret; > + > + return count; > +} > + > +static ssize_t sky81452_bl_show_open_short(struct device *dev, > + struct device_attribute *attr, char *buf) > +{ > + struct regmap *regmap = bl_get_data(to_backlight_device(dev)); > + unsigned int reg, value = 0; > + char tmp[3]; > + int i, ret; > + > + reg = !strcmp(attr->attr.name, "open") ? SKY81452_REG5 : SKY81452_REG4; > + ret = regmap_read(regmap, reg, &value); > + if (IS_ERR_VALUE(ret)) > + return ret; > + > + if (value & SKY81452_SHRT) { > + *buf = 0; > + for (i = 0; i < 6; i++) { > + if (value & 0x01) { > + sprintf(tmp, "%d ", i + 1); > + strcat(buf, tmp); > + } > + value >>= 1; > + } > + strcat(buf, "\n"); > + } else > + strcpy(buf, "none\n"); Please add braces to 'else' statement. If only one branch of a conditional statement is a single statement. Braces are needed. if () { ... (multi lines) } else { ... } > + > + return strlen(buf); > +} > + > +static ssize_t sky81452_bl_show_fault(struct device *dev, > + struct device_attribute *attr, char *buf) > +{ > + struct regmap *regmap = bl_get_data(to_backlight_device(dev)); > + unsigned int value = 0; > + int ret; > + > + ret = regmap_read(regmap, SKY81452_REG4, &value); > + if (IS_ERR_VALUE(ret)) > + return ret; > + > + *buf = 0; > + > + if (value & SKY81452_OCP) > + strcat(buf, "over-current "); > + > + if (value & SKY81452_OTMP) > + strcat(buf, "over-temperature"); > + > + strcat(buf, "\n"); > + return strlen(buf); > +} > + > +static DEVICE_ATTR(enable, S_IWGRP | S_IWUSR, NULL, sky81452_bl_store_enable); > +static DEVICE_ATTR(open, S_IRUGO, sky81452_bl_show_open_short, NULL); > +static DEVICE_ATTR(short, S_IRUGO, sky81452_bl_show_open_short, NULL); > +static DEVICE_ATTR(fault, S_IRUGO, sky81452_bl_show_fault, NULL); > + > +static struct attribute *sky81452_bl_attribute[] = { > + &dev_attr_enable.attr, > + &dev_attr_open.attr, > + &dev_attr_short.attr, > + &dev_attr_fault.attr, > + NULL > +}; > + > +static const struct attribute_group sky81452_bl_attr_group = { > + .attrs = sky81452_bl_attribute, > +}; > + > +#ifdef CONFIG_OF > +static struct sky81452_bl_platform_data *sky81452_bl_parse_dt( > + struct device *dev) > +{ > + struct device_node *np = of_node_get(dev->of_node); > + struct sky81452_bl_platform_data *pdata; > + int ret; > + > + if (!np) { > + dev_err(dev, "backlight node not found"); > + return ERR_PTR(-ENODATA); > + } > + > + pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); > + if (!pdata) { > + of_node_put(np); > + return ERR_PTR(-ENOMEM); > + } > + > + of_property_read_string(np, "name", &pdata->name); > + pdata->ignore_pwm = of_property_read_bool(np, "ignore-pwm"); > + pdata->dpwm_mode = of_property_read_bool(np, "dpwm-mode"); > + pdata->phase_shift = of_property_read_bool(np, "phase-shift"); > + > + pdata->gpio_enable = of_get_named_gpio(np, "gpio-enable", 0); > + if (IS_ERR_VALUE(pdata->gpio_enable)) > + pdata->gpio_enable = -1; > + > + ret = of_property_read_u32(np, "enable", &pdata->enable); > + if (IS_ERR_VALUE(ret)) > + pdata->enable = SKY81452_EN >> CTZ(SKY81452_EN); > + > + ret = of_property_read_u32(np, "short-detection-threshold", > + &pdata->short_detection_threshold); > + if (IS_ERR_VALUE(ret)) > + pdata->short_detection_threshold = 7; > + > + ret = of_property_read_u32(np, "boost-current-limit", > + &pdata->boost_current_limit); > + if (IS_ERR_VALUE(ret)) > + pdata->boost_current_limit = 2750; > + > + of_node_put(np); > + return pdata; > +} > +#else > +static struct sky81452_bl_platform_data *sky81452_bl_parse_dt( > + struct device *dev) > +{ > + return ERR_PTR(-EINVAL); > +} > +#endif > + > +static int sky81452_bl_init_device(struct regmap *regmap, > + struct sky81452_bl_platform_data *pdata) > +{ > + unsigned int value; > + > + value = pdata->ignore_pwm ? SKY81452_IGPW : 0; > + value |= pdata->dpwm_mode ? SKY81452_PWMMD : 0; > + value |= pdata->phase_shift ? 0 : SKY81452_PHASE; > + > + if (pdata->boost_current_limit == 2300) > + value |= SKY81452_ILIM; > + else if (pdata->boost_current_limit != 2720) > + return -EINVAL; > + > + if (pdata->short_detection_threshold < 4 || > + pdata->short_detection_threshold > 7) > + return -EINVAL; > + value |= (7 - pdata->short_detection_threshold) << CTZ(SKY81452_VSHRT); > + > + return regmap_write(regmap, SKY81452_REG2, value); > +} > + > +static int sky81452_bl_probe(struct platform_device *pdev) > +{ > + struct device *dev = &pdev->dev; > + struct regmap *regmap = dev_get_drvdata(dev->parent); > + struct sky81452_bl_platform_data *pdata = dev_get_platdata(dev); > + struct backlight_device *bd; > + struct backlight_properties props; > + const char *name; > + int ret; > + > + if (!pdata) { > + pdata = sky81452_bl_parse_dt(dev); > + if (IS_ERR(pdata)) > + return PTR_ERR(pdata); > + } > + > + if (pdata->gpio_enable >= 0) { > + ret = devm_gpio_request_one(dev, pdata->gpio_enable, > + GPIOF_OUT_INIT_HIGH, "sky81452-en"); > + if (IS_ERR_VALUE(ret)) { > + dev_err(dev, "failed to request GPIO. err=%d", ret); > + return ret; > + } > + } > + > + ret = sky81452_bl_init_device(regmap, pdata); > + if (IS_ERR_VALUE(ret)) { > + dev_err(dev, "failed to initialize. err=%d", ret); > + return ret; > + } > + > + memset(&props, 0, sizeof(props)); > + props.max_brightness = SKY81452_MAX_BRIGHTNESS, > + name = pdata->name ? pdata->name : SKY81452_DEFAULT_NAME; > + bd = devm_backlight_device_register(dev, name, dev, regmap, > + &sky81452_bl_ops, &props); > + if (IS_ERR(bd)) { > + dev_err(dev, "failed to register. err=%ld", PTR_ERR(bd)); > + return PTR_ERR(bd); > + } > + > + platform_set_drvdata(pdev, bd); > + > + ret = sysfs_create_group(&bd->dev.kobj, &sky81452_bl_attr_group); > + if (IS_ERR_VALUE(ret)) { > + dev_err(dev, "failed to create attribute. err=%d", ret); > + goto err; > + } > + > + return ret; > +err: > + backlight_device_unregister(bd); This backlight_device_unregister() is NOT necessary. This is because backlight_device_unregister will be called automatically, when devm_backlight_device_register() is used and error returns. > + return ret; > +} > + > +static int sky81452_bl_remove(struct platform_device *pdev) > +{ > + const struct sky81452_bl_platform_data *pdata = > + dev_get_platdata(&pdev->dev); > + struct backlight_device *bd = platform_get_drvdata(pdev); > + > + sysfs_remove_group(&bd->dev.kobj, &sky81452_bl_attr_group); > + > + bd->props.power = FB_BLANK_UNBLANK; > + bd->props.brightness = 0; > + backlight_update_status(bd); > + > + if (pdata->gpio_enable >= 0) > + gpio_set_value_cansleep(pdata->gpio_enable, 0); > + > + return 0; > +} > + > +#ifdef CONFIG_OF > +static const struct of_device_id sky81452_bl_of_match[] = { > + { .compatible = "skyworks,sky81452-backlight", }, > + { } > +}; > +MODULE_DEVICE_TABLE(of, sky81452_bl_of_match); > +#endif > + > +static struct platform_driver sky81452_bl_driver = { > + .driver = { > + .name = "sky81452-backlight", > + .of_match_table = of_match_ptr(sky81452_bl_of_match), > + }, > + .probe = sky81452_bl_probe, > + .remove = sky81452_bl_remove, > +}; > + > +module_platform_driver(sky81452_bl_driver); > + > +MODULE_DESCRIPTION("Skyworks SKY81452 backlight driver"); > +MODULE_AUTHOR("Gyungoh Yoo "); > +MODULE_LICENSE("GPL"); How about using 'GPL v2'? > +MODULE_VERSION("1.2"); > -- > 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jingoo Han Date: Wed, 08 Oct 2014 01:03:57 +0000 Subject: Re: [RESUBMIT PATCH v3 2/8] backlight: Add support Skyworks SKY81452 backlight driver Message-Id: <008e01cfe293$bcd6fe30$3684fa90$%han@samsung.com> List-Id: References: <1412657745-7812-1-git-send-email-jack.yoo@skyworksinc.com> <1412658075-7929-1-git-send-email-jack.yoo@skyworksinc.com> In-Reply-To: <1412658075-7929-1-git-send-email-jack.yoo-tjhQNA90jdKqndwCJWfcng@public.gmane.org> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: 'Gyungoh Yoo' Cc: 'Bryan Wu' , 'Lee Jones' , 'Jean-Christophe Plagniol-Villard' , 'Tomi Valkeinen' , 'Grant Likely' , 'Rob Herring' , linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-fbdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, 'Gyungoh Yoo ' , 'Jingoo Han' On Tuesday, October 07, 2014 2:01 PM, Gyungoh Yoo wrote: > If possible, please add more detailed commit message for this patch. > Signed-off-by: Gyungoh Yoo > --- > drivers/video/backlight/Kconfig | 10 + > drivers/video/backlight/Makefile | 1 + > drivers/video/backlight/sky81452-backlight.c | 347 +++++++++++++++++++++++++++ > 3 files changed, 358 insertions(+) > create mode 100644 drivers/video/backlight/sky81452-backlight.c > > diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig > index 8d03924..2586fdd 100644 > --- a/drivers/video/backlight/Kconfig > +++ b/drivers/video/backlight/Kconfig > @@ -409,6 +409,16 @@ config BACKLIGHT_PANDORA > If you have a Pandora console, say Y to enable the > backlight driver. > > +config BACKLIGHT_SKY81452 > + tristate "Backlight driver for SKY81452" > + depends on BACKLIGHT_CLASS_DEVICE && MFD_SKY81452 > + help > + If you have a Skyworks SKY81452, say Y to enable the > + backlight driver. > + > + To compile this driver as a module, choose M here: the module will > + be called sky81452-backlight > + > config BACKLIGHT_TPS65217 > tristate "TPS65217 Backlight" > depends on BACKLIGHT_CLASS_DEVICE && MFD_TPS65217 > diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile > index fcd50b73..d67073f 100644 > --- a/drivers/video/backlight/Makefile > +++ b/drivers/video/backlight/Makefile > @@ -50,6 +50,7 @@ obj-$(CONFIG_BACKLIGHT_PANDORA) += pandora_bl.o > obj-$(CONFIG_BACKLIGHT_PCF50633) += pcf50633-backlight.o > obj-$(CONFIG_BACKLIGHT_PWM) += pwm_bl.o > obj-$(CONFIG_BACKLIGHT_SAHARA) += kb3886_bl.o > +obj-$(CONFIG_BACKLIGHT_SKY81452) += sky81452-backlight.o > obj-$(CONFIG_BACKLIGHT_TOSA) += tosa_bl.o > obj-$(CONFIG_BACKLIGHT_TPS65217) += tps65217_bl.o > obj-$(CONFIG_BACKLIGHT_WM831X) += wm831x_bl.o > diff --git a/drivers/video/backlight/sky81452-backlight.c b/drivers/video/backlight/sky81452- > backlight.c > new file mode 100644 > index 0000000..101399d > --- /dev/null > +++ b/drivers/video/backlight/sky81452-backlight.c > @@ -0,0 +1,347 @@ > +/* > + * sky81452-backlight.c SKY81452 backlight driver > + * > + * Copyright 2014 Skyworks Solutions Inc. > + * Author : Gyungoh Yoo > + * > + * This program is free software; you can redistribute it and/or modify it > + * under the terms of the GNU General Public License as published by the > + * Free Software Foundation; either version 2, or (at your option) any > + * later version. > + * > + * This program is distributed in the hope that it will be useful, but > + * WITHOUT ANY WARRANTY; without even the implied warranty of > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU > + * General Public License for more details. > + * > + * You should have received a copy of the GNU General Public License along > + * with this program; if not, see . > + */ > + > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include Please, re-order these headers alphabetically. It enhances the readability. > + > +/* registers */ > +#define SKY81452_REG0 0x00 > +#define SKY81452_REG1 0x01 > +#define SKY81452_REG2 0x02 > +#define SKY81452_REG4 0x04 > +#define SKY81452_REG5 0x05 > + > +/* bit mask */ > +#define SKY81452_CS 0xFF > +#define SKY81452_EN 0x3F > +#define SKY81452_IGPW 0x20 > +#define SKY81452_PWMMD 0x10 > +#define SKY81452_PHASE 0x08 > +#define SKY81452_ILIM 0x04 > +#define SKY81452_VSHRT 0x03 > +#define SKY81452_OCP 0x80 > +#define SKY81452_OTMP 0x40 > +#define SKY81452_SHRT 0x3F > +#define SKY81452_OPN 0x3F > + > +#define SKY81452_DEFAULT_NAME "lcd-backlight" > +#define SKY81452_MAX_BRIGHTNESS (SKY81452_CS + 1) > + > +#define CTZ(b) __builtin_ctz(b) > + > +static int sky81452_bl_update_status(struct backlight_device *bd) > +{ > + const struct sky81452_bl_platform_data *pdata > + dev_get_platdata(bd->dev.parent); > + const unsigned int brightness = (unsigned int)bd->props.brightness; > + struct regmap *regmap = bl_get_data(bd); > + int ret; > + > + if (brightness > 0) { > + ret = regmap_write(regmap, SKY81452_REG0, brightness - 1); > + if (IS_ERR_VALUE(ret)) > + return ret; > + > + return regmap_update_bits(regmap, SKY81452_REG1, SKY81452_EN, > + pdata->enable << CTZ(SKY81452_EN)); > + } > + > + return regmap_update_bits(regmap, SKY81452_REG1, SKY81452_EN, 0); > +} > + > +static int sky81452_bl_get_brightness(struct backlight_device *bd) > +{ > + return bd->props.brightness; > +} > + > +static const struct backlight_ops sky81452_bl_ops = { > + .update_status = sky81452_bl_update_status, > + .get_brightness = sky81452_bl_get_brightness, > +}; > + > +static ssize_t sky81452_bl_store_enable(struct device *dev, > + struct device_attribute *attr, const char *buf, size_t count) > +{ > + struct regmap *regmap = bl_get_data(to_backlight_device(dev)); > + unsigned long value; > + int ret; > + > + ret = kstrtoul(buf, 16, &value); > + if (IS_ERR_VALUE(ret)) > + return ret; > + > + ret = regmap_update_bits(regmap, SKY81452_REG1, SKY81452_EN, > + value << CTZ(SKY81452_EN)); > + if (IS_ERR_VALUE(ret)) > + return ret; > + > + return count; > +} > + > +static ssize_t sky81452_bl_show_open_short(struct device *dev, > + struct device_attribute *attr, char *buf) > +{ > + struct regmap *regmap = bl_get_data(to_backlight_device(dev)); > + unsigned int reg, value = 0; > + char tmp[3]; > + int i, ret; > + > + reg = !strcmp(attr->attr.name, "open") ? SKY81452_REG5 : SKY81452_REG4; > + ret = regmap_read(regmap, reg, &value); > + if (IS_ERR_VALUE(ret)) > + return ret; > + > + if (value & SKY81452_SHRT) { > + *buf = 0; > + for (i = 0; i < 6; i++) { > + if (value & 0x01) { > + sprintf(tmp, "%d ", i + 1); > + strcat(buf, tmp); > + } > + value >>= 1; > + } > + strcat(buf, "\n"); > + } else > + strcpy(buf, "none\n"); Please add braces to 'else' statement. If only one branch of a conditional statement is a single statement. Braces are needed. if () { ... (multi lines) } else { ... } > + > + return strlen(buf); > +} > + > +static ssize_t sky81452_bl_show_fault(struct device *dev, > + struct device_attribute *attr, char *buf) > +{ > + struct regmap *regmap = bl_get_data(to_backlight_device(dev)); > + unsigned int value = 0; > + int ret; > + > + ret = regmap_read(regmap, SKY81452_REG4, &value); > + if (IS_ERR_VALUE(ret)) > + return ret; > + > + *buf = 0; > + > + if (value & SKY81452_OCP) > + strcat(buf, "over-current "); > + > + if (value & SKY81452_OTMP) > + strcat(buf, "over-temperature"); > + > + strcat(buf, "\n"); > + return strlen(buf); > +} > + > +static DEVICE_ATTR(enable, S_IWGRP | S_IWUSR, NULL, sky81452_bl_store_enable); > +static DEVICE_ATTR(open, S_IRUGO, sky81452_bl_show_open_short, NULL); > +static DEVICE_ATTR(short, S_IRUGO, sky81452_bl_show_open_short, NULL); > +static DEVICE_ATTR(fault, S_IRUGO, sky81452_bl_show_fault, NULL); > + > +static struct attribute *sky81452_bl_attribute[] = { > + &dev_attr_enable.attr, > + &dev_attr_open.attr, > + &dev_attr_short.attr, > + &dev_attr_fault.attr, > + NULL > +}; > + > +static const struct attribute_group sky81452_bl_attr_group = { > + .attrs = sky81452_bl_attribute, > +}; > + > +#ifdef CONFIG_OF > +static struct sky81452_bl_platform_data *sky81452_bl_parse_dt( > + struct device *dev) > +{ > + struct device_node *np = of_node_get(dev->of_node); > + struct sky81452_bl_platform_data *pdata; > + int ret; > + > + if (!np) { > + dev_err(dev, "backlight node not found"); > + return ERR_PTR(-ENODATA); > + } > + > + pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); > + if (!pdata) { > + of_node_put(np); > + return ERR_PTR(-ENOMEM); > + } > + > + of_property_read_string(np, "name", &pdata->name); > + pdata->ignore_pwm = of_property_read_bool(np, "ignore-pwm"); > + pdata->dpwm_mode = of_property_read_bool(np, "dpwm-mode"); > + pdata->phase_shift = of_property_read_bool(np, "phase-shift"); > + > + pdata->gpio_enable = of_get_named_gpio(np, "gpio-enable", 0); > + if (IS_ERR_VALUE(pdata->gpio_enable)) > + pdata->gpio_enable = -1; > + > + ret = of_property_read_u32(np, "enable", &pdata->enable); > + if (IS_ERR_VALUE(ret)) > + pdata->enable = SKY81452_EN >> CTZ(SKY81452_EN); > + > + ret = of_property_read_u32(np, "short-detection-threshold", > + &pdata->short_detection_threshold); > + if (IS_ERR_VALUE(ret)) > + pdata->short_detection_threshold = 7; > + > + ret = of_property_read_u32(np, "boost-current-limit", > + &pdata->boost_current_limit); > + if (IS_ERR_VALUE(ret)) > + pdata->boost_current_limit = 2750; > + > + of_node_put(np); > + return pdata; > +} > +#else > +static struct sky81452_bl_platform_data *sky81452_bl_parse_dt( > + struct device *dev) > +{ > + return ERR_PTR(-EINVAL); > +} > +#endif > + > +static int sky81452_bl_init_device(struct regmap *regmap, > + struct sky81452_bl_platform_data *pdata) > +{ > + unsigned int value; > + > + value = pdata->ignore_pwm ? SKY81452_IGPW : 0; > + value |= pdata->dpwm_mode ? SKY81452_PWMMD : 0; > + value |= pdata->phase_shift ? 0 : SKY81452_PHASE; > + > + if (pdata->boost_current_limit = 2300) > + value |= SKY81452_ILIM; > + else if (pdata->boost_current_limit != 2720) > + return -EINVAL; > + > + if (pdata->short_detection_threshold < 4 || > + pdata->short_detection_threshold > 7) > + return -EINVAL; > + value |= (7 - pdata->short_detection_threshold) << CTZ(SKY81452_VSHRT); > + > + return regmap_write(regmap, SKY81452_REG2, value); > +} > + > +static int sky81452_bl_probe(struct platform_device *pdev) > +{ > + struct device *dev = &pdev->dev; > + struct regmap *regmap = dev_get_drvdata(dev->parent); > + struct sky81452_bl_platform_data *pdata = dev_get_platdata(dev); > + struct backlight_device *bd; > + struct backlight_properties props; > + const char *name; > + int ret; > + > + if (!pdata) { > + pdata = sky81452_bl_parse_dt(dev); > + if (IS_ERR(pdata)) > + return PTR_ERR(pdata); > + } > + > + if (pdata->gpio_enable >= 0) { > + ret = devm_gpio_request_one(dev, pdata->gpio_enable, > + GPIOF_OUT_INIT_HIGH, "sky81452-en"); > + if (IS_ERR_VALUE(ret)) { > + dev_err(dev, "failed to request GPIO. err=%d", ret); > + return ret; > + } > + } > + > + ret = sky81452_bl_init_device(regmap, pdata); > + if (IS_ERR_VALUE(ret)) { > + dev_err(dev, "failed to initialize. err=%d", ret); > + return ret; > + } > + > + memset(&props, 0, sizeof(props)); > + props.max_brightness = SKY81452_MAX_BRIGHTNESS, > + name = pdata->name ? pdata->name : SKY81452_DEFAULT_NAME; > + bd = devm_backlight_device_register(dev, name, dev, regmap, > + &sky81452_bl_ops, &props); > + if (IS_ERR(bd)) { > + dev_err(dev, "failed to register. err=%ld", PTR_ERR(bd)); > + return PTR_ERR(bd); > + } > + > + platform_set_drvdata(pdev, bd); > + > + ret = sysfs_create_group(&bd->dev.kobj, &sky81452_bl_attr_group); > + if (IS_ERR_VALUE(ret)) { > + dev_err(dev, "failed to create attribute. err=%d", ret); > + goto err; > + } > + > + return ret; > +err: > + backlight_device_unregister(bd); This backlight_device_unregister() is NOT necessary. This is because backlight_device_unregister will be called automatically, when devm_backlight_device_register() is used and error returns. > + return ret; > +} > + > +static int sky81452_bl_remove(struct platform_device *pdev) > +{ > + const struct sky81452_bl_platform_data *pdata > + dev_get_platdata(&pdev->dev); > + struct backlight_device *bd = platform_get_drvdata(pdev); > + > + sysfs_remove_group(&bd->dev.kobj, &sky81452_bl_attr_group); > + > + bd->props.power = FB_BLANK_UNBLANK; > + bd->props.brightness = 0; > + backlight_update_status(bd); > + > + if (pdata->gpio_enable >= 0) > + gpio_set_value_cansleep(pdata->gpio_enable, 0); > + > + return 0; > +} > + > +#ifdef CONFIG_OF > +static const struct of_device_id sky81452_bl_of_match[] = { > + { .compatible = "skyworks,sky81452-backlight", }, > + { } > +}; > +MODULE_DEVICE_TABLE(of, sky81452_bl_of_match); > +#endif > + > +static struct platform_driver sky81452_bl_driver = { > + .driver = { > + .name = "sky81452-backlight", > + .of_match_table = of_match_ptr(sky81452_bl_of_match), > + }, > + .probe = sky81452_bl_probe, > + .remove = sky81452_bl_remove, > +}; > + > +module_platform_driver(sky81452_bl_driver); > + > +MODULE_DESCRIPTION("Skyworks SKY81452 backlight driver"); > +MODULE_AUTHOR("Gyungoh Yoo "); > +MODULE_LICENSE("GPL"); How about using 'GPL v2'? > +MODULE_VERSION("1.2"); > -- > 1.9.1