| /* Copyright (c) 2015, The Linux Foundation. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * * Redistributions of source code must retain the above copyright |
| * 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. |
| * * Neither the name of The Linux Foundation nor the names of its |
| * 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 |
| * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR |
| * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
| * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE |
| * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN |
| * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| * |
| */ |
| |
| #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, ®}, |
| {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() |
| { |
| i2c_dev = qup_blsp_i2c_init(BLSP_ID_1, QUP_ID_3, |
| 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; |
| } |