platform/msm_shared/mipi_dsi_i2c.c

/* Copyright (c) 2015, The Linux Foundation. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
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 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 *       copyright notice, this list of conditions and the following
 *       disclaimer in the documentation and/or other materials provided
 *       with the distribution.
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 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
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 */

#include <mipi_dsi_i2c.h>
#include <blsp_qup.h>
#include <i2c_qup.h>
#include <gsbi.h>
#include <err.h>
#include <debug.h>

#define I2C_CLK_FREQ     100000
#define I2C_SRC_CLK_FREQ 50000000

static struct qup_i2c_dev *i2c_dev;

int mipi_dsi_i2c_read(uint8_t addr, uint8_t reg, uint8_t *buf, uint8_t len)
{
	if (!buf)
		return ERR_INVALID_ARGS;

	if(!i2c_dev)
		return ERR_NOT_VALID;

	struct i2c_msg rd_buf[] = {
		{addr, I2C_M_WR, 1, &reg},
		{addr, I2C_M_RD, len, buf}
	};

	int err = qup_i2c_xfer(i2c_dev, rd_buf, 2);
	if (err < 0) {
		dprintf(CRITICAL, "Read reg %x failed\n", reg);
		return err;
	}

	return NO_ERROR;
}

int mipi_dsi_i2c_read_byte(uint8_t addr, uint8_t reg, uint8_t *buf)
{
	if (!buf)
		return ERR_INVALID_ARGS;

	return mipi_dsi_i2c_read(addr, reg, buf, 1);
}

int mipi_dsi_i2c_write_byte(uint8_t addr, uint8_t reg, uint8_t val)
{
	if (!i2c_dev)
		return ERR_NOT_VALID;

	unsigned char buf[2] = {reg, val};
	struct i2c_msg msg_buf[] = {
		{addr, I2C_M_WR, 2, buf},
	};

	int err = qup_i2c_xfer(i2c_dev, msg_buf, 1);
	if (err < 0) {
		dprintf(CRITICAL, "Write reg %x failed\n", reg);
		return err;
	}
	return NO_ERROR;
}

int mipi_dsi_i2c_device_init(uint8_t blsp_id, uint8_t qup_id)
{
	i2c_dev = qup_blsp_i2c_init(blsp_id, qup_id,
				I2C_CLK_FREQ, I2C_SRC_CLK_FREQ);
	if(!i2c_dev) {
		dprintf(CRITICAL, "mipi_dsi_i2c_device_init() failed\n");
		return ERR_NOT_VALID;
	}
	return NO_ERROR;
}