mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2026-08-09 06:14:34 +02:00
Uwe Kleine-König (The Capable Hub)andLee Jones
b3c8bb2e69
While being less compact, using named initializers allows to more easily see which members of the structs are assigned which value without having to lookup the declaration of the struct. And it's also more robust against changes to the struct definition. The mentioned robustness is relevant for a planned change to struct i2c_device_id that replaces .driver_data by an anonymous union. While touching all these arrays, unify usage of whitespace in the list terminator. This patch doesn't modify the compiled arrays, only their representation in source form benefits. The former was confirmed with x86 and arm64 builds. Signed-off-by: Uwe Kleine-König (The Capable Hub) <u.kleine-koenig@baylibre.com> Reviewed-by: Daniel Thompson (RISCstar) <danielt@kernel.org> Link: https://patch.msgid.link/20260518111203.639603-2-u.kleine-koenig@baylibre.com Signed-off-by: Lee Jones <lee@kernel.org>
153 lines
3.9 KiB
C
153 lines
3.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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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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#include <linux/backlight.h>
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#include <linux/err.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_get_brightness(backlight);
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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 bool lv5207lp_backlight_controls_device(struct backlight_device *backlight,
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struct device *display_dev)
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{
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struct lv5207lp *lv = bl_get_data(backlight);
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return !lv->pdata->dev || lv->pdata->dev == display_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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.controls_device = lv5207lp_backlight_controls_device,
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};
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static int lv5207lp_probe(struct i2c_client *client)
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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 void 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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}
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static const struct i2c_device_id lv5207lp_ids[] = {
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{ .name = "lv5207lp" },
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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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