On Wednesday, December 03, 2014 4:05 PM, Gyungoh Yoo wrote: > > From: Gyungoh Yoo <jack.yoo@xxxxxxxxxxxxxxx> > > Signed-off-by: Gyungoh Yoo <jack.yoo@xxxxxxxxxxxxxxx> Acked-by: Jingoo Han <jg1.han@xxxxxxxxxxx> Best regards, Jingoo Han > --- > Changes v10: > Removed trivial get_brightness implementations > > Changes v9: > Nothing > > Changes v8: > Renamed property names for backlight with vendor prefix > Modified gpio-enable property to generic property for GPIO > > Changes v7: > Modified licensing text to GPLv2 > > Changes v6: > Added new line character at the end of line of dev_err() > > Changes v5: > Move sky81452-backlight.h to include/linux/platform_data > > Changes v4: > Reordering header files for readability > Removed calling to backlight_device_unregister() > Removed MODULE_VERSION() > Modified license to GPLv2 > > Changes v3: > Modified DBG messages > > Changes v2: > Added 'compatible' attribute in the driver > Added message for exception or errors > > drivers/video/backlight/Kconfig | 10 + > drivers/video/backlight/Makefile | 1 + > drivers/video/backlight/sky81452-backlight.c | 334 +++++++++++++++++++++++ > include/linux/platform_data/sky81452-backlight.h | 46 ++++ > 4 files changed, 391 insertions(+) > create mode 100644 drivers/video/backlight/sky81452-backlight.c > create mode 100644 include/linux/platform_data/sky81452-backlight.h > > 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..8105597 > --- /dev/null > +++ b/drivers/video/backlight/sky81452-backlight.c > @@ -0,0 +1,334 @@ > +/* > + * sky81452-backlight.c SKY81452 backlight driver > + * > + * Copyright 2014 Skyworks Solutions Inc. > + * Author : Gyungoh Yoo <jack.yoo@xxxxxxxxxxxxxxx> > + * > + * 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. > + * > + * 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 <http://www.gnu.org/licenses/>. > + */ > + > +#include <linux/backlight.h> > +#include <linux/err.h> > +#include <linux/gpio.h> > +#include <linux/init.h> > +#include <linux/kernel.h> > +#include <linux/module.h> > +#include <linux/of.h> > +#include <linux/of_gpio.h> > +#include <linux/platform_device.h> > +#include <linux/regmap.h> > +#include <linux/platform_data/sky81452-backlight.h> > +#include <linux/slab.h> > + > +/* 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 const struct backlight_ops sky81452_bl_ops = { > + .update_status = sky81452_bl_update_status, > +}; > + > +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"); > + } > + > + 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.\n"); > + 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, "skyworks,ignore-pwm"); > + pdata->dpwm_mode = of_property_read_bool(np, "skyworks,dpwm-mode"); > + pdata->phase_shift = of_property_read_bool(np, "skyworks,phase-shift"); > + pdata->gpio_enable = of_get_gpio(np, 0); > + > + ret = of_property_read_u32(np, "skyworks,en-channels", &pdata->enable); > + if (IS_ERR_VALUE(ret)) > + pdata->enable = SKY81452_EN >> CTZ(SKY81452_EN); > + > + ret = of_property_read_u32(np, "skyworks,short-detection-threshold", > + &pdata->short_detection_threshold); > + if (IS_ERR_VALUE(ret)) > + pdata->short_detection_threshold = 7; > + > + ret = of_property_read_u32(np, "skyworks,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 != 2750) > + 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 (gpio_is_valid(pdata->gpio_enable)) { > + 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\n", ret); > + return ret; > + } > + } > + > + ret = sky81452_bl_init_device(regmap, pdata); > + if (IS_ERR_VALUE(ret)) { > + dev_err(dev, "failed to initialize. err=%d\n", 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\n", 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\n", ret); > + return ret; > + } > + > + 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 (gpio_is_valid(pdata->gpio_enable)) > + 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 <jack.yoo@xxxxxxxxxxxxxxx>"); > +MODULE_LICENSE("GPL v2"); > diff --git a/include/linux/platform_data/sky81452-backlight.h b/include/linux/platform_data/sky81452- > backlight.h > new file mode 100644 > index 0000000..1231e9b > --- /dev/null > +++ b/include/linux/platform_data/sky81452-backlight.h > @@ -0,0 +1,46 @@ > +/* > + * sky81452.h SKY81452 backlight driver > + * > + * Copyright 2014 Skyworks Solutions Inc. > + * Author : Gyungoh Yoo <jack.yoo@xxxxxxxxxxxxxxx> > + * > + * 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. > + * > + * 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 <http://www.gnu.org/licenses/>. > + */ > + > +#ifndef _SKY81452_BACKLIGHT_H > +#define _SKY81452_BACKLIGHT_H > + > +/** > + * struct sky81452_platform_data > + * @name: backlight driver name. > + If it is not defined, default name is lcd-backlight. > + * @gpio_enable:GPIO number which control EN pin > + * @enable: Enable mask for current sink channel 1, 2, 3, 4, 5 and 6. > + * @ignore_pwm: true if DPWMI should be ignored. > + * @dpwm_mode: true is DPWM dimming mode, otherwise Analog dimming mode. > + * @phase_shift:true is phase shift mode. > + * @short_detecion_threshold: It should be one of 4, 5, 6 and 7V. > + * @boost_current_limit: It should be one of 2300, 2750mA. > + */ > +struct sky81452_bl_platform_data { > + const char *name; > + int gpio_enable; > + unsigned int enable; > + bool ignore_pwm; > + bool dpwm_mode; > + bool phase_shift; > + unsigned int short_detection_threshold; > + unsigned int boost_current_limit; > +}; > + > +#endif > -- > 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
