Re: [PATCH v9 2/8] backlight: Add support Skyworks SKY81452 backlight driver

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 




On Tue, Dec 2, 2014 at 12:05 AM,  <gyungoh@xxxxxxxxx> wrote:
> From: Gyungoh Yoo <jack.yoo@xxxxxxxxxxxxxxx>
>
> Signed-off-by: Gyungoh Yoo <jack.yoo@xxxxxxxxxxxxxxx>

This patch looks good to me and I think Jingoo reviewed it already. So
please take my Ack here:
Acked-by: Bryan Wu <cooloney@xxxxxxxxx>

Lee, can you apply this patch?

Thanks,
-Bryan

> ---
> 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     | 340 +++++++++++++++++++++++
>  include/linux/platform_data/sky81452-backlight.h |  46 +++
>  4 files changed, 397 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..45e575f
> --- /dev/null
> +++ b/drivers/video/backlight/sky81452-backlight.c
> @@ -0,0 +1,340 @@
> +/*
> + * 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 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");
> +       }
> +
> +       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




[Index of Archives]     [Device Tree Compilter]     [Device Tree Spec]     [Linux Driver Backports]     [Video for Linux]     [Linux USB Devel]     [Linux PCI Devel]     [Linux Audio Users]     [Linux Kernel]     [Linux SCSI]     [XFree86]     [Yosemite Backpacking]
  Powered by Linux