cregit-Linux how code gets into the kernel

Release 4.14 drivers/video/backlight/tosa_bl.c

/*
 *  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); }

Contributors

PersonTokensPropCommitsCommitProp
Dmitry Baryshkov7494.87%150.00%
Jingoo Han45.13%150.00%
Total78100.00%2100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
Dmitry Baryshkov6998.57%150.00%
Jingoo Han11.43%150.00%
Total70100.00%2100.00%


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

Contributors

PersonTokensPropCommitsCommitProp
Dmitry Baryshkov26100.00%1100.00%
Total26100.00%1100.00%

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; }

Contributors

PersonTokensPropCommitsCommitProp
Dmitry Baryshkov17872.95%114.29%
Matthew Garrett3514.34%228.57%
Jingoo Han3112.70%457.14%
Total244100.00%7100.00%


static int tosa_bl_remove(struct i2c_client *client) { struct tosa_bl_data *data = i2c_get_clientdata(client); data->bl = NULL; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Dmitry Baryshkov30100.00%1100.00%
Total30100.00%1100.00%

#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; }

Contributors

PersonTokensPropCommitsCommitProp
Dmitry Baryshkov2787.10%150.00%
Jingoo Han412.90%150.00%
Total31100.00%2100.00%


static int tosa_bl_resume(struct device *dev) { struct tosa_bl_data *data = dev_get_drvdata(dev); backlight_update_status(data->bl); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Dmitry Baryshkov2787.10%150.00%
Jingoo Han412.90%150.00%
Total31100.00%2100.00%

#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");

Overall Contributors

PersonTokensPropCommitsCommitProp
Dmitry Baryshkov58284.47%17.14%
Jingoo Han598.56%750.00%
Matthew Garrett355.08%214.29%
Javier Martinez Canillas71.02%17.14%
Tejun Heo30.44%17.14%
Axel Lin20.29%17.14%
Emese Revfy10.15%17.14%
Total689100.00%14100.00%
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