171 lines
4.4 KiB
C
171 lines
4.4 KiB
C
/*
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* Sanyo LV5207LP LED Driver
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*
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* Copyright (C) 2013 Ideas on board SPRL
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*
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* Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/backlight.h>
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#include <linux/err.h>
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#include <linux/fb.h>
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/platform_data/lv5207lp.h>
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#include <linux/slab.h>
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#define LV5207LP_CTRL1 0x00
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#define LV5207LP_CPSW (1 << 7)
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#define LV5207LP_SCTEN (1 << 6)
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#define LV5207LP_C10 (1 << 5)
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#define LV5207LP_CKSW (1 << 4)
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#define LV5207LP_RSW (1 << 3)
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#define LV5207LP_GSW (1 << 2)
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#define LV5207LP_BSW (1 << 1)
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#define LV5207LP_CTRL2 0x01
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#define LV5207LP_MSW (1 << 7)
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#define LV5207LP_MLED4 (1 << 6)
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#define LV5207LP_RED 0x02
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#define LV5207LP_GREEN 0x03
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#define LV5207LP_BLUE 0x04
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#define LV5207LP_MAX_BRIGHTNESS 32
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struct lv5207lp {
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struct i2c_client *client;
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struct backlight_device *backlight;
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struct lv5207lp_platform_data *pdata;
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};
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static int lv5207lp_write(struct lv5207lp *lv, u8 reg, u8 data)
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{
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return i2c_smbus_write_byte_data(lv->client, reg, data);
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}
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static int lv5207lp_backlight_update_status(struct backlight_device *backlight)
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{
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struct lv5207lp *lv = bl_get_data(backlight);
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int brightness = backlight->props.brightness;
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if (backlight->props.power != FB_BLANK_UNBLANK ||
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backlight->props.fb_blank != FB_BLANK_UNBLANK ||
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backlight->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
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brightness = 0;
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if (brightness) {
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lv5207lp_write(lv, LV5207LP_CTRL1,
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LV5207LP_CPSW | LV5207LP_C10 | LV5207LP_CKSW);
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lv5207lp_write(lv, LV5207LP_CTRL2,
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LV5207LP_MSW | LV5207LP_MLED4 |
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(brightness - 1));
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} else {
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lv5207lp_write(lv, LV5207LP_CTRL1, 0);
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lv5207lp_write(lv, LV5207LP_CTRL2, 0);
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}
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return 0;
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}
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static int lv5207lp_backlight_get_brightness(struct backlight_device *backlight)
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{
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return backlight->props.brightness;
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}
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static int lv5207lp_backlight_check_fb(struct backlight_device *backlight,
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struct fb_info *info)
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{
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struct lv5207lp *lv = bl_get_data(backlight);
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return lv->pdata->fbdev == NULL || lv->pdata->fbdev == info->dev;
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}
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static const struct backlight_ops lv5207lp_backlight_ops = {
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.options = BL_CORE_SUSPENDRESUME,
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.update_status = lv5207lp_backlight_update_status,
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.get_brightness = lv5207lp_backlight_get_brightness,
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.check_fb = lv5207lp_backlight_check_fb,
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};
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static int lv5207lp_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct lv5207lp_platform_data *pdata = dev_get_platdata(&client->dev);
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struct backlight_device *backlight;
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struct backlight_properties props;
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struct lv5207lp *lv;
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if (pdata == NULL) {
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dev_err(&client->dev, "No platform data supplied\n");
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return -EINVAL;
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}
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if (!i2c_check_functionality(client->adapter,
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I2C_FUNC_SMBUS_BYTE_DATA)) {
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dev_warn(&client->dev,
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"I2C adapter doesn't support I2C_FUNC_SMBUS_BYTE\n");
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return -EIO;
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}
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lv = devm_kzalloc(&client->dev, sizeof(*lv), GFP_KERNEL);
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if (!lv)
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return -ENOMEM;
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lv->client = client;
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lv->pdata = pdata;
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memset(&props, 0, sizeof(props));
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props.type = BACKLIGHT_RAW;
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props.max_brightness = min_t(unsigned int, pdata->max_value,
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LV5207LP_MAX_BRIGHTNESS);
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props.brightness = clamp_t(unsigned int, pdata->def_value, 0,
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props.max_brightness);
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backlight = devm_backlight_device_register(&client->dev,
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dev_name(&client->dev), &lv->client->dev,
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lv, &lv5207lp_backlight_ops, &props);
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if (IS_ERR(backlight)) {
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dev_err(&client->dev, "failed to register backlight\n");
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return PTR_ERR(backlight);
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}
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backlight_update_status(backlight);
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i2c_set_clientdata(client, backlight);
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return 0;
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}
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static int lv5207lp_remove(struct i2c_client *client)
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{
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struct backlight_device *backlight = i2c_get_clientdata(client);
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backlight->props.brightness = 0;
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backlight_update_status(backlight);
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return 0;
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}
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static const struct i2c_device_id lv5207lp_ids[] = {
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{ "lv5207lp", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, lv5207lp_ids);
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static struct i2c_driver lv5207lp_driver = {
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.driver = {
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.name = "lv5207lp",
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},
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.probe = lv5207lp_probe,
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.remove = lv5207lp_remove,
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.id_table = lv5207lp_ids,
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};
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module_i2c_driver(lv5207lp_driver);
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MODULE_DESCRIPTION("Sanyo LV5207LP Backlight Driver");
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MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
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MODULE_LICENSE("GPL");
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