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
a031b5fce5
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 and commas. 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: Alexander Sverdlin <alexander.sverdlin@gmail.com> Link: https://patch.msgid.link/20260522104222.4081017-2-u.kleine-koenig@baylibre.com Signed-off-by: Lee Jones <lee@kernel.org>
160 lines
3.7 KiB
C
160 lines
3.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* TI LP8501 9 channel LED Driver
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*
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* Copyright (C) 2013 Texas Instruments
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*
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* Author: Milo(Woogyom) Kim <milo.kim@ti.com>
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*/
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#include <linux/delay.h>
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#include <linux/firmware.h>
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#include <linux/i2c.h>
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#include <linux/init.h>
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#include <linux/leds.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/of.h>
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#include <linux/platform_data/leds-lp55xx.h>
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#include <linux/slab.h>
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#include "leds-lp55xx-common.h"
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#define LP8501_PAGES_PER_ENGINE 1
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#define LP8501_MAX_LEDS 9
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/* Registers */
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#define LP8501_REG_ENABLE 0x00
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#define LP8501_ENABLE BIT(6)
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#define LP8501_REG_OP_MODE 0x01
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#define LP8501_REG_PWR_CONFIG 0x05
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#define LP8501_PWR_CONFIG_M 0x03
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#define LP8501_REG_LED_PWM_BASE 0x16
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#define LP8501_REG_LED_CURRENT_BASE 0x26
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#define LP8501_REG_CONFIG 0x36
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#define LP8501_PWM_PSAVE BIT(7)
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#define LP8501_AUTO_INC BIT(6)
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#define LP8501_PWR_SAVE BIT(5)
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#define LP8501_CP_MODE_MASK 0x18
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#define LP8501_CP_MODE_SHIFT 3
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#define LP8501_INT_CLK BIT(0)
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#define LP8501_DEFAULT_CFG (LP8501_PWM_PSAVE | LP8501_AUTO_INC | LP8501_PWR_SAVE)
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#define LP8501_REG_STATUS 0x3A
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#define LP8501_ENGINE_BUSY BIT(4)
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#define LP8501_REG_RESET 0x3D
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#define LP8501_RESET 0xFF
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#define LP8501_REG_PROG_MEM 0x50
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static int lp8501_post_init_device(struct lp55xx_chip *chip)
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{
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int ret;
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u8 val = LP8501_DEFAULT_CFG;
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ret = lp55xx_write(chip, LP8501_REG_ENABLE, LP8501_ENABLE);
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if (ret)
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return ret;
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/* Chip startup time is 500 us, 1 - 2 ms gives some margin */
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usleep_range(1000, 2000);
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if (chip->pdata->clock_mode != LP55XX_CLOCK_EXT)
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val |= LP8501_INT_CLK;
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val |= (chip->pdata->charge_pump_mode << LP8501_CP_MODE_SHIFT) & LP8501_CP_MODE_MASK;
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ret = lp55xx_write(chip, LP8501_REG_CONFIG, val);
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if (ret)
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return ret;
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/* Power selection for each output */
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return lp55xx_update_bits(chip, LP8501_REG_PWR_CONFIG,
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LP8501_PWR_CONFIG_M, chip->pdata->pwr_sel);
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}
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static void lp8501_run_engine(struct lp55xx_chip *chip, bool start)
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{
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/* stop engine */
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if (!start) {
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lp55xx_stop_all_engine(chip);
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lp55xx_turn_off_channels(chip);
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return;
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}
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lp55xx_run_engine_common(chip);
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}
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/* Chip specific configurations */
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static struct lp55xx_device_config lp8501_cfg = {
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.reg_op_mode = {
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.addr = LP8501_REG_OP_MODE,
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},
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.reg_exec = {
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.addr = LP8501_REG_ENABLE,
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},
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.engine_busy = {
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.addr = LP8501_REG_STATUS,
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.mask = LP8501_ENGINE_BUSY,
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},
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.reset = {
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.addr = LP8501_REG_RESET,
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.val = LP8501_RESET,
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},
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.enable = {
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.addr = LP8501_REG_ENABLE,
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.val = LP8501_ENABLE,
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},
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.prog_mem_base = {
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.addr = LP8501_REG_PROG_MEM,
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},
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.reg_led_pwm_base = {
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.addr = LP8501_REG_LED_PWM_BASE,
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},
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.reg_led_current_base = {
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.addr = LP8501_REG_LED_CURRENT_BASE,
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},
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.pages_per_engine = LP8501_PAGES_PER_ENGINE,
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.max_channel = LP8501_MAX_LEDS,
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.post_init_device = lp8501_post_init_device,
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.brightness_fn = lp55xx_led_brightness,
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.set_led_current = lp55xx_set_led_current,
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.firmware_cb = lp55xx_firmware_loaded_cb,
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.run_engine = lp8501_run_engine,
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};
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static const struct i2c_device_id lp8501_id[] = {
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{ .name = "lp8501", .driver_data = (kernel_ulong_t)&lp8501_cfg },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, lp8501_id);
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static const struct of_device_id of_lp8501_leds_match[] = {
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{ .compatible = "ti,lp8501", .data = &lp8501_cfg, },
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{},
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};
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MODULE_DEVICE_TABLE(of, of_lp8501_leds_match);
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static struct i2c_driver lp8501_driver = {
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.driver = {
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.name = "lp8501",
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.of_match_table = of_lp8501_leds_match,
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},
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.probe = lp55xx_probe,
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.remove = lp55xx_remove,
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.id_table = lp8501_id,
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};
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module_i2c_driver(lp8501_driver);
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MODULE_DESCRIPTION("Texas Instruments LP8501 LED driver");
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MODULE_AUTHOR("Milo Kim");
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MODULE_LICENSE("GPL");
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