linux/drivers/gpu/drm/loongson/lsdc_i2c.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (C) 2023 Loongson Technology Corporation Limited
 */

#include <drm/drm_managed.h>

#include "lsdc_drv.h"
#include "lsdc_output.h"

/*
 * __lsdc_gpio_i2c_set - set the state of a gpio pin indicated by mask
 * @mask: gpio pin mask
 * @state: "0" for low, "1" for high
 */
static void __lsdc_gpio_i2c_set(struct lsdc_i2c * const li2c, int mask, int state)
{ … }

/*
 * __lsdc_gpio_i2c_get - read value back from the gpio pin indicated by mask
 * @mask: gpio pin mask
 * return "0" for low, "1" for high
 */
static int __lsdc_gpio_i2c_get(struct lsdc_i2c * const li2c, int mask)
{ … }

static void lsdc_gpio_i2c_set_sda(void *i2c, int state)
{ … }

static void lsdc_gpio_i2c_set_scl(void *i2c, int state)
{ … }

static int lsdc_gpio_i2c_get_sda(void *i2c)
{ … }

static int lsdc_gpio_i2c_get_scl(void *i2c)
{ … }

static void lsdc_destroy_i2c(struct drm_device *ddev, void *data)
{ … }

/*
 * The DC in ls7a1000/ls7a2000/ls2k2000 has builtin gpio hardware
 *
 * @reg_base: gpio reg base
 * @index: output channel index, 0 for PIPE0, 1 for PIPE1
 */
int lsdc_create_i2c_chan(struct drm_device *ddev,
			 struct lsdc_display_pipe *dispipe,
			 unsigned int index)
{ … }