Re: [PATCH v3 06/17] video: lcd: add LoCoMo LCD driver

[Lee Jones <lee.jones@linaro.org>]

On Sun, 17 May 2015, Dmitry Eremin-Solenikov wrote:

> LoCoMo has some special handling for TFT screens attached to Collie and
> Poodle. Implement that as a separate driver.
> 
> Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
> ---
>  drivers/video/backlight/Kconfig      |  10 ++
>  drivers/video/backlight/Makefile     |   1 +
>  drivers/video/backlight/locomo_lcd.c | 285 +++++++++++++++++++++++++++++++++++
>  3 files changed, 296 insertions(+)
>  create mode 100644 drivers/video/backlight/locomo_lcd.c

This looks like it should be part of patch 16.

How much of this file is the same as the one removed later in the set?

> diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
> index 6c093e2..b2f995c 100644
> --- a/drivers/video/backlight/Kconfig
> +++ b/drivers/video/backlight/Kconfig
> @@ -48,6 +48,16 @@ config LCD_LMS283GF05
>  	  SPI driver for Samsung LMS283GF05. This provides basic support
>  	  for powering the LCD up/down through a sysfs interface.
>  
> +config LCD_LOCOMO
> +	tristate "Sharp LOCOMO LCD Driver"
> +	depends on MFD_LOCOMO
> +	select IIO
> +	help
> +	  If you have a Sharp Zaurus SL-5500 (Collie) or SL-5600 (Poodle) say y to
> +	  enable the LCD driver.  The panel starts up in power
> +	  off state, so you need this driver in order to see any
> +	  output.
> +
>  config LCD_LTV350QV
>  	tristate "Samsung LTV350QV LCD Panel"
>  	depends on SPI_MASTER
> diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
> index 2de73d2..686cf1a 100644
> --- a/drivers/video/backlight/Makefile
> +++ b/drivers/video/backlight/Makefile
> @@ -11,6 +11,7 @@ obj-$(CONFIG_LCD_L4F00242T03)		+= l4f00242t03.o
>  obj-$(CONFIG_LCD_LD9040)		+= ld9040.o
>  obj-$(CONFIG_LCD_LMS283GF05)		+= lms283gf05.o
>  obj-$(CONFIG_LCD_LMS501KF03)		+= lms501kf03.o
> +obj-$(CONFIG_LCD_LOCOMO)		+= locomo_lcd.o
>  obj-$(CONFIG_LCD_LTV350QV)		+= ltv350qv.o
>  obj-$(CONFIG_LCD_PLATFORM)		+= platform_lcd.o
>  obj-$(CONFIG_LCD_S6E63M0)		+= s6e63m0.o
> diff --git a/drivers/video/backlight/locomo_lcd.c b/drivers/video/backlight/locomo_lcd.c
> new file mode 100644
> index 0000000..dc316cb
> --- /dev/null
> +++ b/drivers/video/backlight/locomo_lcd.c
> @@ -0,0 +1,285 @@
> +/*
> + * Backlight control code for Sharp Zaurus SL-5500
> + *
> + * Copyright 2005 John Lenz <lenz@cs.wisc.edu>
> + * Maintainer: Pavel Machek <pavel@ucw.cz> (unless John wants to :-)
> + * GPL v2
> + *
> + * This driver assumes single CPU. That's okay, because collie is
> + * slightly old hardware, and no one is going to retrofit second CPU to
> + * old PDA.
> + */
> +
> +#include <linux/delay.h>
> +#include <linux/fb.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/iio/consumer.h>
> +#include <linux/lcd.h>
> +#include <linux/mfd/locomo.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +
> +struct locomo_lcd {
> +	struct regmap *regmap;
> +	struct platform_device *dev;
> +	struct locomo_lcd_platform_data *data;
> +	int power;
> +	struct iio_channel *comadj;
> +	struct gpio_desc *vsha, *vshd, *vee, *mod;
> +};
> +
> +static void locomo_lcd_on(struct locomo_lcd *lcd)
> +{
> +	gpiod_set_value(lcd->vsha, 1);
> +	usleep_range(2000, 3000);
> +
> +	gpiod_set_value(lcd->vshd, 1);
> +	usleep_range(2000, 3000);
> +
> +	iio_write_channel_raw(lcd->comadj, lcd->data->comadj);
> +	usleep_range(5000, 6000);
> +
> +	gpiod_set_value(lcd->vee, 1);
> +	usleep_range(10000, 11000);
> +
> +	/* TFTCRST | CPSOUT=0 | CPSEN */
> +	regmap_write(lcd->regmap, LOCOMO_TC, 0x01);
> +
> +	/* Set CPSD */
> +	regmap_write(lcd->regmap, LOCOMO_CPSD, 6);
> +
> +	/* TFTCRST | CPSOUT=0 | CPSEN */
> +	regmap_write(lcd->regmap, LOCOMO_TC, 0x04 | 0x01);
> +	usleep_range(10000, 11000);
> +
> +	gpiod_set_value(lcd->mod, 1);
> +}
> +
> +static void locomo_lcd_off(struct locomo_lcd *lcd)
> +{
> +	/* TFTCRST=1 | CPSOUT=1 | CPSEN = 0 */
> +	regmap_write(lcd->regmap, LOCOMO_TC, 0x06);
> +	usleep_range(1000, 2000);
> +
> +	gpiod_set_value(lcd->vsha, 0);
> +	msleep(110);
> +
> +	gpiod_set_value(lcd->vee, 0);
> +	msleep(700);
> +
> +	iio_write_channel_raw(lcd->comadj, 0);
> +	usleep_range(5000, 6000);
> +
> +	/* TFTCRST=0 | CPSOUT=0 | CPSEN = 0 */
> +	regmap_write(lcd->regmap, LOCOMO_TC, 0);
> +	gpiod_set_value(lcd->mod, 0);
> +	gpiod_set_value(lcd->vshd, 0);
> +}
> +
> +static void locomo_lcd_program_adsync(struct locomo_lcd *lcd)
> +{
> +	regmap_write(lcd->regmap, LOCOMO_ASD,
> +			6 + 8 + 320 + 30 - 10);
> +	regmap_update_bits(lcd->regmap, LOCOMO_ASD,
> +		0x8000,
> +		0x8000);
> +
> +	regmap_write(lcd->regmap, LOCOMO_HSD,
> +			6 + 8 + 320 + 30 - 10 - 128 + 4);
> +	regmap_update_bits(lcd->regmap, LOCOMO_HSD,
> +		0x8000,
> +		0x8000);
> +
> +	regmap_write(lcd->regmap, LOCOMO_HSC, 128 / 8);
> +
> +	/* XON */
> +	regmap_write(lcd->regmap, LOCOMO_TADC, 0x80);
> +	usleep_range(1000, 1100);
> +
> +	/* CLK9MEN */
> +	regmap_update_bits(lcd->regmap, LOCOMO_TADC,
> +		0x10,
> +		0x10);
> +	usleep_range(100, 200);
> +}
> +
> +static void locomo_lcd_disable_adsync(struct locomo_lcd *lcd)
> +{
> +	/* ADSTART */
> +	regmap_write(lcd->regmap, LOCOMO_ASD, 0x00);
> +
> +	/* 18MHz clock off*/
> +	regmap_write(lcd->regmap, LOCOMO_TADC, 0x00);
> +}
> +
> +int locomo_lcd_set_power(struct lcd_device *ldev, int power)
> +{
> +	struct locomo_lcd *lcd = lcd_get_data(ldev);
> +
> +	dev_dbg(&ldev->dev, "LCD power %d (is %d)\n", power, lcd->power);
> +
> +	if (!power && lcd->power)
> +		locomo_lcd_on(lcd);
> +
> +	if (power && !lcd->power)
> +		locomo_lcd_off(lcd);
> +
> +	lcd->power = power;
> +
> +	return 0;
> +}
> +
> +static int locomo_lcd_get_power(struct lcd_device *ldev)
> +{
> +	struct locomo_lcd *lcd = lcd_get_data(ldev);
> +
> +	return lcd->power;
> +}
> +
> +static struct lcd_ops locomo_lcd_ops = {
> +	.set_power = locomo_lcd_set_power,
> +	.get_power = locomo_lcd_get_power,
> +};
> +
> +#ifdef CONFIG_PM_SLEEP
> +static int locomo_lcd_suspend(struct device *dev)
> +{
> +	struct lcd_device *ldev = dev_get_drvdata(dev);
> +	struct locomo_lcd *lcd = lcd_get_data(ldev);
> +
> +	locomo_lcd_off(lcd);
> +
> +	locomo_lcd_disable_adsync(lcd);
> +
> +	return 0;
> +}
> +
> +static int locomo_lcd_resume(struct device *dev)
> +{
> +	struct lcd_device *ldev = dev_get_drvdata(dev);
> +	struct locomo_lcd *lcd = lcd_get_data(ldev);
> +
> +	locomo_lcd_program_adsync(lcd);
> +
> +	if (!lcd->power)
> +		locomo_lcd_on(lcd);
> +
> +	return 0;
> +}
> +
> +static SIMPLE_DEV_PM_OPS(locomo_lcd_pm, locomo_lcd_suspend, locomo_lcd_resume);
> +#define LOCOMOLCD_PM	(&locomo_lcd_pm)
> +#else
> +#define LOCOMOLCD_PM	NULL
> +#endif
> +
> +static int locomo_lcd_probe(struct platform_device *dev)
> +{
> +	struct lcd_device *lcd_dev;
> +	struct locomo_lcd *lcd;
> +	int rc;
> +
> +	lcd = devm_kmalloc(&dev->dev, sizeof(struct locomo_lcd), GFP_KERNEL);
> +	if (!lcd)
> +		return -ENOMEM;
> +
> +	lcd->dev = dev;
> +	lcd->power = FB_BLANK_NORMAL;
> +
> +	lcd->regmap = dev_get_regmap(dev->dev.parent, NULL);
> +	if (!lcd->regmap)
> +		return -ENODEV;
> +
> +	lcd->data = dev_get_platdata(&dev->dev);
> +	if (!lcd->data)
> +		return -EINVAL;
> +
> +	lcd->vsha = devm_gpiod_get(&dev->dev, "VSHA", GPIOD_OUT_LOW);
> +	if (IS_ERR(lcd->vsha))
> +		return PTR_ERR(lcd->vsha);
> +
> +	lcd->vshd = devm_gpiod_get(&dev->dev, "VSHD", GPIOD_OUT_LOW);
> +	if (IS_ERR(lcd->vshd))
> +		return PTR_ERR(lcd->vshd);
> +
> +	lcd->vee = devm_gpiod_get(&dev->dev, "Vee", GPIOD_OUT_LOW);
> +	if (IS_ERR(lcd->vee))
> +		return PTR_ERR(lcd->vee);
> +
> +	lcd->mod = devm_gpiod_get(&dev->dev, "MOD", GPIOD_OUT_LOW);
> +	if (IS_ERR(lcd->mod))
> +		return PTR_ERR(lcd->mod);
> +
> +	lcd->comadj = iio_channel_get(&dev->dev, "comadj");
> +	if (IS_ERR(lcd->comadj)) {
> +		rc = PTR_ERR(lcd->comadj);
> +		if (rc == -ENODEV)
> +			rc = -EPROBE_DEFER;
> +
> +		return rc;
> +	}
> +
> +	locomo_lcd_program_adsync(lcd);
> +
> +	lcd_dev = devm_lcd_device_register(&dev->dev, "locomo", &dev->dev, lcd,
> +			&locomo_lcd_ops);
> +	if (IS_ERR(lcd_dev)) {
> +		rc = PTR_ERR(lcd_dev);
> +		goto err;
> +	}
> +
> +	platform_set_drvdata(dev, lcd_dev);
> +
> +	lcd_set_power(lcd_dev, FB_BLANK_UNBLANK);
> +
> +	return 0;
> +
> +err:
> +	locomo_lcd_disable_adsync(lcd);
> +	iio_channel_release(lcd->comadj);
> +
> +	return rc;
> +}
> +
> +static int locomo_lcd_remove(struct platform_device *dev)
> +{
> +	struct lcd_device *ldev = platform_get_drvdata(dev);
> +	struct locomo_lcd *lcd = lcd_get_data(ldev);
> +
> +	locomo_lcd_off(lcd);
> +
> +	locomo_lcd_disable_adsync(lcd);
> +
> +	iio_channel_release(lcd->comadj);
> +
> +	return 0;
> +}
> +
> +static void locomo_lcd_shutdown(struct platform_device *dev)
> +{
> +	struct lcd_device *ldev = platform_get_drvdata(dev);
> +	struct locomo_lcd *lcd = lcd_get_data(ldev);
> +
> +	locomo_lcd_off(lcd);
> +
> +	locomo_lcd_disable_adsync(lcd);
> +}
> +
> +static struct platform_driver locomo_lcd_driver = {
> +	.driver = {
> +		.name	= "locomo-lcd",
> +		.pm	= LOCOMOLCD_PM,
> +	},
> +	.probe	= locomo_lcd_probe,
> +	.remove	= locomo_lcd_remove,
> +	.shutdown = locomo_lcd_shutdown,
> +};
> +
> +module_platform_driver(locomo_lcd_driver);
> +
> +MODULE_AUTHOR("John Lenz <lenz@cs.wisc.edu>");
> +MODULE_AUTHOR("Pavel Machek <pavel@ucw.cz>");
> +MODULE_DESCRIPTION("LoCoMo LCD driver");
> +MODULE_LICENSE("GPL v2");
> +MODULE_ALIAS("platform:locomo-lcd");

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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