/*
 *  LCD / Backlight control code for Sharp SL-6000x (tosa)
 *
 *  Copyright (c) 2005		Dirk Opfer
 *  Copyright (c) 2007,2008	Dmitry Baryshkov
 *
 *  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/kernel.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/spi/spi.h>
#include <linux/i2c.h>
#include <linux/gpio.h>
#include <linux/fb.h>
#include <linux/backlight.h>
#include <linux/slab.h>

#include <asm/mach/sharpsl_param.h>

#include <mach/tosa.h>

#define COMADJ_DEFAULT	97

#define DAC_CH1		0
#define DAC_CH2		1

struct tosa_bl_data {
	struct i2c_client *i2c;
	struct backlight_device *bl;

	int comadj;
};

static void tosa_bl_set_backlight(struct tosa_bl_data *data, int brightness)
{
	struct spi_device *spi = dev_get_platdata(&data->i2c->dev);

	i2c_smbus_write_byte_data(data->i2c, DAC_CH1, data->comadj);

	/* SetBacklightDuty */
	i2c_smbus_write_byte_data(data->i2c, DAC_CH2, (u8)(brightness & 0xff));

	/* SetBacklightVR */
	gpio_set_value(TOSA_GPIO_BL_C20MA, brightness & 0x100);

	tosa_bl_enable(spi, brightness);
}

static int tosa_bl_update_status(struct backlight_device *dev)
{
	struct backlight_properties *props = &dev->props;
	struct tosa_bl_data *data = bl_get_data(dev);
	int power = max(props->power, props->fb_blank);
	int brightness = props->brightness;

	if (power)
		brightness = 0;

	tosa_bl_set_backlight(data, brightness);

	return 0;
}

static int tosa_bl_get_brightness(struct backlight_device *dev)
{
	struct backlight_properties *props = &dev->props;

	return props->brightness;
}

static const struct backlight_ops bl_ops = {
	.get_brightness		= tosa_bl_get_brightness,
	.update_status		= tosa_bl_update_status,
};

static int tosa_bl_probe(struct i2c_client *client,
		const struct i2c_device_id *id)
{
	struct backlight_properties props;
	struct tosa_bl_data *data;
	int ret = 0;

	data = devm_kzalloc(&client->dev, sizeof(struct tosa_bl_data),
				GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	data->comadj = sharpsl_param.comadj == -1 ? COMADJ_DEFAULT : sharpsl_param.comadj;

	ret = devm_gpio_request_one(&client->dev, TOSA_GPIO_BL_C20MA,
				GPIOF_OUT_INIT_LOW, "backlight");
	if (ret) {
		dev_dbg(&data->bl->dev, "Unable to request gpio!\n");
		return ret;
	}

	i2c_set_clientdata(client, data);
	data->i2c = client;

	memset(&props, 0, sizeof(struct backlight_properties));
	props.type = BACKLIGHT_RAW;
	props.max_brightness = 512 - 1;
	data->bl = devm_backlight_device_register(&client->dev, "tosa-bl",
						&client->dev, data, &bl_ops,
						&props);
	if (IS_ERR(data->bl)) {
		ret = PTR_ERR(data->bl);
		goto err_reg;
	}

	data->bl->props.brightness = 69;
	data->bl->props.power = FB_BLANK_UNBLANK;

	backlight_update_status(data->bl);

	return 0;

err_reg:
	data->bl = NULL;
	return ret;
}

static int tosa_bl_remove(struct i2c_client *client)
{
	struct tosa_bl_data *data = i2c_get_clientdata(client);

	data->bl = NULL;
	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int tosa_bl_suspend(struct device *dev)
{
	struct tosa_bl_data *data = dev_get_drvdata(dev);

	tosa_bl_set_backlight(data, 0);

	return 0;
}

static int tosa_bl_resume(struct device *dev)
{
	struct tosa_bl_data *data = dev_get_drvdata(dev);

	backlight_update_status(data->bl);
	return 0;
}
#endif

static SIMPLE_DEV_PM_OPS(tosa_bl_pm_ops, tosa_bl_suspend, tosa_bl_resume);

static const struct i2c_device_id tosa_bl_id[] = {
	{ "tosa-bl", 0 },
	{ },
};
MODULE_DEVICE_TABLE(i2c, tosa_bl_id);

static struct i2c_driver tosa_bl_driver = {
	.driver = {
		.name		= "tosa-bl",
		.pm		= &tosa_bl_pm_ops,
	},
	.probe		= tosa_bl_probe,
	.remove		= tosa_bl_remove,
	.id_table	= tosa_bl_id,
};

module_i2c_driver(tosa_bl_driver);

MODULE_AUTHOR("Dmitry Baryshkov");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("LCD/Backlight control for Sharp SL-6000 PDA");

iv><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2016-12-12 21:58:13 -0800</td></tr>
<tr><th>committer</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2016-12-12 21:58:13 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/dwc3/gadget.h?id=e7aa8c2eb11ba69b1b69099c3c7bd6be3087b0ba'>e7aa8c2eb11ba69b1b69099c3c7bd6be3087b0ba</a> (<a href='/cgit.cgi/linux/net-next.git/patch/drivers/usb/dwc3/gadget.h?id=e7aa8c2eb11ba69b1b69099c3c7bd6be3087b0ba'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/'>f63906f41699c8e38af9d12b063e2ceab0286ef2</a> /<a href='/cgit.cgi/linux/net-next.git/tree/drivers/usb/dwc3/gadget.h'>drivers/usb/dwc3/gadget.h</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/dwc3/gadget.h?id=e34bac726d27056081d0250c0e173e4b155aa340'>e34bac726d27056081d0250c0e173e4b155aa340</a> (<a href='/cgit.cgi/linux/net-next.git/diff/drivers/usb/dwc3/gadget.h?id2=e34bac726d27056081d0250c0e173e4b155aa340'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/dwc3/gadget.h?id=868c97a846a73e937d835b09b8c885a69df50ec8'>868c97a846a73e937d835b09b8c885a69df50ec8</a> (<a href='/cgit.cgi/linux/net-next.git/diff/drivers/usb/dwc3/gadget.h?id2=868c97a846a73e937d835b09b8c885a69df50ec8'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge tag 'docs-4.10' of git://git.lwn.net/linux<span class='decoration'><a class='deco' href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/dwc3/gadget.h?id=e7aa8c2eb11ba69b1b69099c3c7bd6be3087b0ba'>HEAD</a><a class='branch-deco' href='/cgit.cgi/linux/net-next.git/log/drivers/usb/dwc3/gadget.h'>master</a></span></div><div class='commit-msg'>Pull documentation update from Jonathan Corbet:
 "These are the documentation changes for 4.10.

  It's another busy cycle for the docs tree, as the sphinx conversion
  continues. Highlights include:

   - Further work on PDF output, which remains a bit of a pain but
     should be more solid now.

   - Five more DocBook template files converted to Sphinx. Only 27 to
     go... Lots of plain-text files have also been converted and
     integrated.

   - Images in binary formats have been replaced with more
     source-friendly versions.

   - Various bits of organizational work, including the renaming of
     various files discussed at the kernel summit.

   - New documentation for the device_link mechanism.

  ... and, of course, lots of typo fixes and small updates"

* tag 'docs-4.10' of git://git.lwn.net/linux: (193 commits)
  dma-buf: Extract dma-buf.rst
  Update Documentation/00-INDEX
  docs: 00-INDEX: document directories/files with no docs
  docs: 00-INDEX: remove non-existing entries
  docs: 00-INDEX: add missing entries for documentation files/dirs
  docs: 00-INDEX: consolidate process/ and admin-guide/ description
  scripts: add a script to check if Documentation/00-INDEX is sane
  Docs: change sh -&gt; awk in REPORTING-BUGS
  Documentation/core-api/device_link: Add initial documentation
  core-api: remove an unexpected unident
  ppc/idle: Add documentation for powersave=off
  Doc: Correct typo, "Introdution" =&gt; "Introduction"
  Documentation/atomic_ops.txt: convert to ReST markup
  Documentation/local_ops.txt: convert to ReST markup
  Documentation/assoc_array.txt: convert to ReST markup
  docs-rst: parse-headers.pl: cleanup the documentation
  docs-rst: fix media cleandocs target
  docs-rst: media/Makefile: reorganize the rules
  docs-rst: media: build SVG from graphviz files
  docs-rst: replace bayer.png by a SVG image
  ...
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/'>Diffstat</a> (limited to 'drivers/usb/dwc3/gadget.h')</div><table summary='diffstat' class='diffstat'>