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Release 4.14 drivers/video/backlight/lv5207lp.c

/*
 * Sanyo LV5207LP LED Driver
 *
 * Copyright (C) 2013 Ideas on board SPRL
 *
 * Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
 *
 * 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/backlight.h>
#include <linux/err.h>
#include <linux/fb.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/platform_data/lv5207lp.h>
#include <linux/slab.h>


#define LV5207LP_CTRL1			0x00

#define LV5207LP_CPSW			(1 << 7)

#define LV5207LP_SCTEN			(1 << 6)

#define LV5207LP_C10			(1 << 5)

#define LV5207LP_CKSW			(1 << 4)

#define LV5207LP_RSW			(1 << 3)

#define LV5207LP_GSW			(1 << 2)

#define LV5207LP_BSW			(1 << 1)

#define LV5207LP_CTRL2			0x01

#define LV5207LP_MSW			(1 << 7)

#define LV5207LP_MLED4			(1 << 6)

#define LV5207LP_RED			0x02

#define LV5207LP_GREEN			0x03

#define LV5207LP_BLUE			0x04


#define LV5207LP_MAX_BRIGHTNESS		32


struct lv5207lp {
	
struct i2c_client *client;
	
struct backlight_device *backlight;
	
struct lv5207lp_platform_data *pdata;
};


static int lv5207lp_write(struct lv5207lp *lv, u8 reg, u8 data) { return i2c_smbus_write_byte_data(lv->client, reg, data); }

Contributors

PersonTokensPropCommitsCommitProp
Laurent Pinchart29100.00%1100.00%
Total29100.00%1100.00%


static int lv5207lp_backlight_update_status(struct backlight_device *backlight) { struct lv5207lp *lv = bl_get_data(backlight); int brightness = backlight->props.brightness; if (backlight->props.power != FB_BLANK_UNBLANK || backlight->props.fb_blank != FB_BLANK_UNBLANK || backlight->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK)) brightness = 0; if (brightness) { lv5207lp_write(lv, LV5207LP_CTRL1, LV5207LP_CPSW | LV5207LP_C10 | LV5207LP_CKSW); lv5207lp_write(lv, LV5207LP_CTRL2, LV5207LP_MSW | LV5207LP_MLED4 | (brightness - 1)); } else { lv5207lp_write(lv, LV5207LP_CTRL1, 0); lv5207lp_write(lv, LV5207LP_CTRL2, 0); } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Laurent Pinchart124100.00%1100.00%
Total124100.00%1100.00%


static int lv5207lp_backlight_check_fb(struct backlight_device *backlight, struct fb_info *info) { struct lv5207lp *lv = bl_get_data(backlight); return lv->pdata->fbdev == NULL || lv->pdata->fbdev == info->dev; }

Contributors

PersonTokensPropCommitsCommitProp
Laurent Pinchart45100.00%1100.00%
Total45100.00%1100.00%

static const struct backlight_ops lv5207lp_backlight_ops = { .options = BL_CORE_SUSPENDRESUME, .update_status = lv5207lp_backlight_update_status, .check_fb = lv5207lp_backlight_check_fb, };
static int lv5207lp_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct lv5207lp_platform_data *pdata = dev_get_platdata(&client->dev); struct backlight_device *backlight; struct backlight_properties props; struct lv5207lp *lv; if (pdata == NULL) { dev_err(&client->dev, "No platform data supplied\n"); return -EINVAL; } if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) { dev_warn(&client->dev, "I2C adapter doesn't support I2C_FUNC_SMBUS_BYTE\n"); return -EIO; } lv = devm_kzalloc(&client->dev, sizeof(*lv), GFP_KERNEL); if (!lv) return -ENOMEM; lv->client = client; lv->pdata = pdata; memset(&props, 0, sizeof(props)); props.type = BACKLIGHT_RAW; props.max_brightness = min_t(unsigned int, pdata->max_value, LV5207LP_MAX_BRIGHTNESS); props.brightness = clamp_t(unsigned int, pdata->def_value, 0, props.max_brightness); backlight = devm_backlight_device_register(&client->dev, dev_name(&client->dev), &lv->client->dev, lv, &lv5207lp_backlight_ops, &props); if (IS_ERR(backlight)) { dev_err(&client->dev, "failed to register backlight\n"); return PTR_ERR(backlight); } backlight_update_status(backlight); i2c_set_clientdata(client, backlight); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Laurent Pinchart24396.05%133.33%
Jingoo Han103.95%266.67%
Total253100.00%3100.00%


static int lv5207lp_remove(struct i2c_client *client) { struct backlight_device *backlight = i2c_get_clientdata(client); backlight->props.brightness = 0; backlight_update_status(backlight); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Laurent Pinchart37100.00%1100.00%
Total37100.00%1100.00%

static const struct i2c_device_id lv5207lp_ids[] = { { "lv5207lp", 0 }, { } }; MODULE_DEVICE_TABLE(i2c, lv5207lp_ids); static struct i2c_driver lv5207lp_driver = { .driver = { .name = "lv5207lp", }, .probe = lv5207lp_probe, .remove = lv5207lp_remove, .id_table = lv5207lp_ids, }; module_i2c_driver(lv5207lp_driver); MODULE_DESCRIPTION("Sanyo LV5207LP Backlight Driver"); MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>"); MODULE_LICENSE("GPL");

Overall Contributors

PersonTokensPropCommitsCommitProp
Laurent Pinchart67998.55%133.33%
Jingoo Han101.45%266.67%
Total689100.00%3100.00%
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