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![Andy Shevchenko](/assets/img/avatar_default.png)
Update header inclusions to follow IWYU (Include What You Use) principle. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Duje Mihanović <duje.mihanovic@skole.hr> Link: https://lore.kernel.org/r/20240223203010.881065-1-andriy.shevchenko@linux.intel.com Signed-off-by: Lee Jones <lee@kernel.org>
73 lines
2.1 KiB
C
73 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Shared library for Kinetic's ExpressWire protocol.
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* This protocol works by pulsing the ExpressWire IC's control GPIO.
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* ktd2692 and ktd2801 are known to use this protocol.
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*/
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#include <linux/bits.h>
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#include <linux/delay.h>
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#include <linux/export.h>
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#include <linux/gpio/consumer.h>
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#include <linux/types.h>
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#include <linux/leds-expresswire.h>
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void expresswire_power_off(struct expresswire_common_props *props)
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{
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gpiod_set_value_cansleep(props->ctrl_gpio, 0);
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usleep_range(props->timing.poweroff_us, props->timing.poweroff_us * 2);
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}
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EXPORT_SYMBOL_NS_GPL(expresswire_power_off, EXPRESSWIRE);
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void expresswire_enable(struct expresswire_common_props *props)
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{
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gpiod_set_value(props->ctrl_gpio, 1);
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udelay(props->timing.detect_delay_us);
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gpiod_set_value(props->ctrl_gpio, 0);
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udelay(props->timing.detect_us);
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gpiod_set_value(props->ctrl_gpio, 1);
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}
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EXPORT_SYMBOL_NS_GPL(expresswire_enable, EXPRESSWIRE);
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void expresswire_start(struct expresswire_common_props *props)
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{
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gpiod_set_value(props->ctrl_gpio, 1);
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udelay(props->timing.data_start_us);
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}
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EXPORT_SYMBOL_NS_GPL(expresswire_start, EXPRESSWIRE);
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void expresswire_end(struct expresswire_common_props *props)
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{
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gpiod_set_value(props->ctrl_gpio, 0);
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udelay(props->timing.end_of_data_low_us);
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gpiod_set_value(props->ctrl_gpio, 1);
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udelay(props->timing.end_of_data_high_us);
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}
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EXPORT_SYMBOL_NS_GPL(expresswire_end, EXPRESSWIRE);
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void expresswire_set_bit(struct expresswire_common_props *props, bool bit)
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{
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if (bit) {
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gpiod_set_value(props->ctrl_gpio, 0);
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udelay(props->timing.short_bitset_us);
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gpiod_set_value(props->ctrl_gpio, 1);
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udelay(props->timing.long_bitset_us);
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} else {
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gpiod_set_value(props->ctrl_gpio, 0);
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udelay(props->timing.long_bitset_us);
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gpiod_set_value(props->ctrl_gpio, 1);
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udelay(props->timing.short_bitset_us);
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}
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}
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EXPORT_SYMBOL_NS_GPL(expresswire_set_bit, EXPRESSWIRE);
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void expresswire_write_u8(struct expresswire_common_props *props, u8 val)
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{
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expresswire_start(props);
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for (int i = 7; i >= 0; i--)
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expresswire_set_bit(props, val & BIT(i));
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expresswire_end(props);
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}
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EXPORT_SYMBOL_NS_GPL(expresswire_write_u8, EXPRESSWIRE);
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