From d97f87b00cc8301b91023301a24e690146d74cef Mon Sep 17 00:00:00 2001
From: Edward O'Callaghan <quasisec@google.com>
Date: Thu, 26 Mar 2020 00:00:41 +1100
Subject: [PATCH] Initial Realtek MST i2c_spi support
This spi master allows for programming of a Realtek RTD2142
MST with external SPI flash chip routed via its internal i2c
transport mechanism.
BUG=b:152558985,b:148745673
BRANCH=none
TEST=echo "00000000:0004ffff fw" > layout && \
flashrom -p realtek_mst_i2c_spi:bus=8 -l layout -i fw:dump.bin -r && \
flashrom -p realtek_mst_i2c_spi:bus=8 -l layout -i fw:dump.bin -w && \
flashrom -p realtek_mst_i2c_spi:bus=8 --flash-size && \
flashrom -p realtek_mst_i2c_spi:bus=8 --flash-name
Change-Id: I892e0be776fe605e69fb39c77abf3016591d7123
Signed-off-by: Edward O'Callaghan <quasisec@google.com>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/40667
Reviewed-by: Edward Hill <ecgh@chromium.org>
Reviewed-by: Shiyu Sun <sshiyu@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
---
Makefile | 24 +++
flashrom.c | 12 ++
meson.build | 5 +
meson_options.txt | 1 +
programmer.h | 8 +
realtek_mst_i2c_spi.c | 437 ++++++++++++++++++++++++++++++++++++++++++
6 files changed, 487 insertions(+)
create mode 100644 realtek_mst_i2c_spi.c
diff --git a/Makefile b/Makefile
index a533acf3..31e987c7 100644
--- a/Makefile
+++ b/Makefile
@@ -200,6 +200,11 @@ UNSUPPORTED_FEATURES += CONFIG_LSPCON_I2C_SPI=yes
else
override CONFIG_LSPCON_I2C_SPI = no
endif
+ifeq ($(CONFIG_REALTEK_MST_I2C_SPI), yes)
+UNSUPPORTED_FEATURES += CONFIG_REALTEK_MST_I2C_SPI=yes
+else
+override CONFIG_REALTEK_MST_I2C_SPI = no
+endif
# libjaylink is also not available for DOS
ifeq ($(CONFIG_JLINK_SPI), yes)
UNSUPPORTED_FEATURES += CONFIG_JLINK_SPI=yes
@@ -316,6 +321,11 @@ UNSUPPORTED_FEATURES += CONFIG_LSPCON_I2C_SPI=yes
else
override CONFIG_LSPCON_I2C_SPI = no
endif
+ifeq ($(CONFIG_REALTEK_MST_I2C_SPI), yes)
+UNSUPPORTED_FEATURES += CONFIG_REALTEK_MST_I2C_SPI=yes
+else
+override CONFIG_REALTEK_MST_I2C_SPI = no
+endif
endif
ifneq ($(TARGET_OS), MinGW)
@@ -396,6 +406,11 @@ UNSUPPORTED_FEATURES += CONFIG_LSPCON_I2C_SPI=yes
else
override CONFIG_LSPCON_I2C_SPI = no
endif
+ifeq ($(CONFIG_REALTEK_MST_I2C_SPI), yes)
+UNSUPPORTED_FEATURES += CONFIG_REALTEK_MST_I2C_SPI=yes
+else
+override CONFIG_REALTEK_MST_I2C_SPI = no
+endif
ifeq ($(CONFIG_CH341A_SPI), yes)
UNSUPPORTED_FEATURES += CONFIG_CH341A_SPI=yes
else
@@ -674,6 +689,9 @@ CONFIG_STLINKV3_SPI ?= yes
# Disables LSPCON support until the i2c helper supports multiple systems.
CONFIG_LSPCON_I2C_SPI ?= no
+# Disables REALTEK_MST support until the i2c helper supports multiple systems.
+CONFIG_REALTEK_MST_I2C_SPI ?= no
+
# Always enable dummy tracing for now.
CONFIG_DUMMY ?= yes
@@ -755,6 +773,7 @@ override CONFIG_PICKIT2_SPI = no
override CONFIG_RAIDEN = no
override CONFIG_STLINKV3_SPI = no
override CONFIG_LSPCON_I2C_SPI = no
+override CONFIG_REALTEK_MST_I2C_SPI = no
endif
ifeq ($(CONFIG_ENABLE_LIBPCI_PROGRAMMERS), no)
override CONFIG_INTERNAL = no
@@ -939,6 +958,11 @@ PROGRAMMER_OBJS += lspcon_i2c_spi.o
NEED_LIBUSB1 += CONFIG_LSPCON_I2C_SPI
endif
+ifeq ($(CONFIG_REALTEK_MST_I2C_SPI), yes)
+FEATURE_CFLAGS += -D'CONFIG_REALTEK_MST_I2C_SPI=1'
+PROGRAMMER_OBJS += realtek_mst_i2c_spi.o
+endif
+
ifneq ($(NEED_LIBFTDI), )
FTDILIBS := $(call debug_shell,[ -n "$(PKG_CONFIG_LIBDIR)" ] && export PKG_CONFIG_LIBDIR="$(PKG_CONFIG_LIBDIR)" ; $(PKG_CONFIG) --libs libftdi1 || $(PKG_CONFIG) --libs libftdi || printf "%s" "-lftdi -lusb")
FEATURE_CFLAGS += $(call debug_shell,grep -q "FT232H := yes" .features && printf "%s" "-D'HAVE_FT232H=1'")
diff --git a/flashrom.c b/flashrom.c
index 07ce734b..4a309861 100644
--- a/flashrom.c
+++ b/flashrom.c
@@ -401,6 +401,18 @@ const struct programmer_entry programmer_table[] = {
},
#endif
+#if CONFIG_REALTEK_MST_I2C_SPI == 1
+ {
+ .name = "realtek_mst_i2c_spi",
+ .type = OTHER,
+ .devs.note = "Device files /dev/i2c-*.\n",
+ .init = realtek_mst_i2c_spi_init,
+ .map_flash_region = fallback_map,
+ .unmap_flash_region = fallback_unmap,
+ .delay = internal_delay,
+ },
+#endif
+
#if CONFIG_USBBLASTER_SPI == 1
{
.name = "usbblaster_spi",
diff --git a/meson.build b/meson.build
index 699370a6..5d8e630e 100644
--- a/meson.build
+++ b/meson.build
@@ -64,6 +64,7 @@ config_serprog = get_option('config_serprog')
config_usbblaster_spi = get_option('config_usbblaster_spi')
config_stlinkv3_spi = get_option('config_stlinkv3_spi')
config_lspcon_i2c_spi = get_option('config_lspcon_i2c_spi')
+config_realtek_mst_i2c_spi = get_option('config_realtek_mst_i2c_spi')
cargs = []
deps = []
@@ -288,6 +289,10 @@ if config_lspcon_i2c_spi
srcs += 'lspcon_i2c_spi.c'
cargs += '-DCONFIG_LSPCON_I2C_SPI=1'
endif
+if config_realtek_mst_i2c_spi
+ srcs += 'realtek_mst_i2c_spi.c'
+ cargs += '-DCONFIG_REALTEK_MST_I2C_SPI=1'
+endif
# bitbanging SPI infrastructure
if config_bitbang_spi
diff --git a/meson_options.txt b/meson_options.txt
index a103dc60..ac48e4e7 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -36,3 +36,4 @@ option('config_serprog', type : 'boolean', value : true, description : 'serprog'
option('config_usbblaster_spi', type : 'boolean', value : true, description : 'Altera USB-Blaster dongles')
option('config_stlinkv3_spi', type : 'boolean', value : true, description : 'STMicroelectronics STLINK-V3')
option('config_lspcon_i2c_spi', type : 'boolean', value : false, description : 'Parade lspcon USB-C to HDMI protocol translator')
+option('config_realtek_mst_i2c_spi', type : 'boolean', value : true, description : 'Realtek MultiStream Transport MST')
diff --git a/programmer.h b/programmer.h
index 49a9d29d..c5cab18b 100644
--- a/programmer.h
+++ b/programmer.h
@@ -132,6 +132,9 @@ enum programmer {
#endif
#if CONFIG_LSPCON_I2C_SPI == 1
PROGRAMMER_LSPCON_I2C_SPI,
+#endif
+#if CONFIG_REALTEK_MST_I2C_SPI == 1
+ PROGRAMMER_REALTEK_MST_I2C_SPI,
#endif
PROGRAMMER_INVALID /* This must always be the last entry. */
};
@@ -819,4 +822,9 @@ struct libusb_device_handle *usb_dev_get_by_vid_pid_number(
int lspcon_i2c_spi_init(void);
#endif
+/* realtek_mst_i2c_spi.c */
+#if CONFIG_REALTEK_MST_I2C_SPI == 1
+int realtek_mst_i2c_spi_init(void);
+#endif
+
#endif /* !__PROGRAMMER_H__ */
diff --git a/realtek_mst_i2c_spi.c b/realtek_mst_i2c_spi.c
new file mode 100644
index 00000000..ba41ed25
--- /dev/null
+++ b/realtek_mst_i2c_spi.c
@@ -0,0 +1,437 @@
+/*
+ * This file is part of the flashrom project.
+ *
+ * Copyright (C) 2020 The Chromium OS Authors
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <stdlib.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+#include <time.h>
+#include <errno.h>
+
+#include "programmer.h"
+#include "spi.h"
+#include "i2c_helper.h"
+
+
+#define MCU_I2C_SLAVE_ADDR 0x94
+#define REGISTER_ADDRESS (0x94 >> 1)
+#define PAGE_SIZE 256
+#define MAX_SPI_WAIT_RETRIES 1000
+
+//opcodes
+#define OPCODE_READ 3
+#define OPCODE_WRITE 2
+
+
+struct realtek_mst_i2c_spi_data {
+ int fd;
+};
+
+static int realtek_mst_i2c_spi_write_data(int fd, uint16_t addr, void *buf, uint16_t len)
+{
+ i2c_buffer_t data;
+ if (i2c_buffer_t_fill(&data, buf, len))
+ return SPI_GENERIC_ERROR;
+
+ return i2c_write(fd, addr, &data) == len ? 0 : SPI_GENERIC_ERROR;
+}
+
+static int realtek_mst_i2c_spi_read_data(int fd, uint16_t addr, void *buf, uint16_t len)
+{
+ i2c_buffer_t data;
+ if (i2c_buffer_t_fill(&data, buf, len))
+ return SPI_GENERIC_ERROR;
+
+ return i2c_read(fd, addr, &data) == len ? 0 : SPI_GENERIC_ERROR;
+}
+
+static int get_fd_from_context(const struct flashctx *flash)
+{
+ if (!flash || !flash->mst || !flash->mst->spi.data) {
+ msg_perr("Unable to extract fd from flash context.\n");
+ return SPI_GENERIC_ERROR;
+ }
+ const struct realtek_mst_i2c_spi_data *data =
+ (const struct realtek_mst_i2c_spi_data *)flash->mst->spi.data;
+
+ return data->fd;
+}
+
+static int realtek_mst_i2c_spi_write_register(int fd, uint8_t reg, uint8_t value)
+{
+ uint8_t command[] = { reg, value };
+ return realtek_mst_i2c_spi_write_data(fd, REGISTER_ADDRESS, command, 2);
+}
+
+static int realtek_mst_i2c_spi_read_register(int fd, uint8_t reg, uint8_t *value)
+{
+ uint8_t command[] = { reg };
+ int ret = realtek_mst_i2c_spi_write_data(fd, REGISTER_ADDRESS, command, 1);
+ ret |= realtek_mst_i2c_spi_read_data(fd, REGISTER_ADDRESS, value, 1);
+
+ return ret ? SPI_GENERIC_ERROR : 0;
+}
+
+static int realtek_mst_i2c_spi_wait_command_done(int fd, unsigned int offset, int mask)
+{
+ uint8_t val;
+ int tried = 0;
+ int ret = 0;
+ do {
+ ret |= realtek_mst_i2c_spi_read_register(fd, offset, &val);
+ } while (!ret && (val & mask) && ++tried < MAX_SPI_WAIT_RETRIES);
+
+ if (tried == MAX_SPI_WAIT_RETRIES) {
+ msg_perr("%s: Time out on sending command.\n", __func__);
+ return -MAX_SPI_WAIT_RETRIES;
+ }
+
+ return (val & mask) ? SPI_GENERIC_ERROR : ret;
+}
+
+static int realtek_mst_i2c_spi_enter_isp_mode(int fd)
+{
+ // 0xFF6F = 0x80;
+ int ret = realtek_mst_i2c_spi_write_register(fd, 0x6F, 0x80); // enter isp mode
+
+ // set internal osc divider register to default to speed up MCU
+ // 0x06A0 = 0x74
+ ret |= realtek_mst_i2c_spi_write_register(fd, 0xF4, 0x9F);
+ ret |= realtek_mst_i2c_spi_write_register(fd, 0xF5, 0x06);
+ ret |= realtek_mst_i2c_spi_write_register(fd, 0xF4, 0xA0);
+ ret |= realtek_mst_i2c_spi_write_register(fd, 0xF5, 0x74);
+
+ return ret;
+}
+
+static int realtek_mst_i2c_spi_reset_mpu(int fd)
+{
+ int ret = 0;
+ // 0xFFEE[1] = 1;
+ uint8_t val = 0;
+ ret |= realtek_mst_i2c_spi_read_register(fd, 0xEE, &val);
+ ret |= realtek_mst_i2c_spi_write_register(fd, 0xEE, (val & 0xFD) | 0x02);
+ return ret;
+}
+
+#if 0
+static int realtek_mst_i2c_spi_set_defaults(int fd)
+{
+ // 0xFF1B = 0x02;
+ int ret = realtek_mst_i2c_spi_write_register(fd, 0x1B, 0x02);
+ ret = realtek_mst_i2c_spi_write_register(fd, 0x1C, 0x30);
+ ret = realtek_mst_i2c_spi_write_register(fd, 0x1D, 0x1C);
+ ret = realtek_mst_i2c_spi_write_register(fd, 0x1E, 0x02);
+ ret = realtek_mst_i2c_spi_write_register(fd, 0x1F, 0x00);
+
+ ret = realtek_mst_i2c_spi_write_register(fd, 0x20, 0x1C);
+ ret = realtek_mst_i2c_spi_write_register(fd, 0x2C, 0x02);
+ ret = realtek_mst_i2c_spi_write_register(fd, 0x2D, 0x00);
+ ret = realtek_mst_i2c_spi_write_register(fd, 0x2E, 0x1C);
+
+ ret = realtek_mst_i2c_spi_write_register(fd, 0x62, 0x06);
+ ret = realtek_mst_i2c_spi_write_register(fd, 0x6A, 0x03);
+ ret = realtek_mst_i2c_spi_write_register(fd, 0x6B, 0x0B);
+ ret = realtek_mst_i2c_spi_write_register(fd, 0x6C, 0x00);
+
+ ret = realtek_mst_i2c_spi_write_register(fd, 0xED, 0x88);
+ ret = realtek_mst_i2c_spi_write_register(fd, 0xEE, 0x04);
+
+ return ret;
+}
+#endif
+
+static int realtek_mst_i2c_spi_disable_protection(int fd)
+{
+ int ret = 0;
+ uint8_t val = 0;
+ // 0xAB[2:0] = b001
+
+ ret |= realtek_mst_i2c_spi_write_register(fd, 0xF4, 0x9F);
+ ret |= realtek_mst_i2c_spi_write_register(fd, 0xF5, 0x10);
+ ret |= realtek_mst_i2c_spi_write_register(fd, 0xF4, 0xAB);
+
+ ret |= realtek_mst_i2c_spi_read_register(fd, 0xF5, &val);
+
+ ret |= realtek_mst_i2c_spi_write_register(fd, 0xF4, 0x9F);
+ ret |= realtek_mst_i2c_spi_write_register(fd, 0xF5, 0x10);
+ ret |= realtek_mst_i2c_spi_write_register(fd, 0xF4, 0xAB);
+
+ ret |= realtek_mst_i2c_spi_write_register(fd, 0xF5, (val & 0xF8) | 0x01);
+
+ /* Set pin value to high, 0xFFD7[0] = 1. */
+ ret |= realtek_mst_i2c_spi_read_register(fd, 0xD7, &val);
+ ret |= realtek_mst_i2c_spi_write_register(fd, 0xD7, (val & 0xFE) | 0x01);
+
+ return ret;
+}
+
+static int realtek_mst_i2c_spi_send_command(const struct flashctx *flash,
+ unsigned int writecnt, unsigned int readcnt,
+ const unsigned char *writearr,
+ unsigned char *readarr)
+{
+ unsigned i;
+ int ret = 0;
+
+ if (writecnt > 4 || readcnt > 3 || writecnt == 0) {
+ //msg_perr("%s: Invalid read/write count for send command.\n", __func__);
+ return SPI_GENERIC_ERROR;
+ }
+ //printf("%s: writearr[0]=0x%x\n", __func__, writearr[0]);
+
+ int fd = get_fd_from_context(flash);
+ if (fd < 0)
+ return SPI_GENERIC_ERROR;
+
+ /* First byte of writearr should be the command value, followed by the value to write. */
+ // 0xFF60 = cmd;
+ writecnt--;
+ uint8_t ctrl_reg_val = (writecnt << 3) | (readcnt << 1) | (2 << 5);
+ ret |= realtek_mst_i2c_spi_write_register(fd, 0x60, ctrl_reg_val);
+ ret |= realtek_mst_i2c_spi_write_register(fd, 0x61, writearr[0]);
+
+ for (i = 0; i < writecnt; ++i)
+ ret |= realtek_mst_i2c_spi_write_register(fd, 0x64 + i, writearr[i + 1]);
+ ret |= realtek_mst_i2c_spi_write_register(fd, 0x60, ctrl_reg_val | 0x1);
+ if (ret)
+ return ret;
+
+ ret = realtek_mst_i2c_spi_wait_command_done(fd, 0x60, 0x01);
+ if (ret)
+ return ret;
+
+ for (i = 0; i < readcnt; ++i)
+ ret |= realtek_mst_i2c_spi_read_register(fd, 0x67 + i, &readarr[i]);
+
+ //for (i = 0; i< readcnt; i++)
+ // printf("DEBUG: readarr[%d]=0x%02x\n", i, readarr[i]);
+
+ return ret;
+}
+
+static int realtek_mst_i2c_spi_map_page(int fd, uint8_t block_idx, uint8_t page_idx, uint8_t byte_idx)
+{
+ int ret = 0;
+ ret |= realtek_mst_i2c_spi_write_register(fd, 0x64, block_idx);
+ ret |= realtek_mst_i2c_spi_write_register(fd, 0x65, page_idx);
+ ret |= realtek_mst_i2c_spi_write_register(fd, 0x66, byte_idx);
+
+ return ret ? SPI_GENERIC_ERROR : 0;
+}
+
+static int realtek_mst_i2c_spi_read(struct flashctx *flash, uint8_t *buf,
+ unsigned int start, unsigned int len)
+{
+ unsigned i;
+ int ret = 0;
+
+ if (start & 0xff)
+ return default_spi_read(flash, buf, start, len);
+
+ int fd = get_fd_from_context(flash);
+ if (fd < 0)
+ return SPI_GENERIC_ERROR;
+
+ start--;
+ ret |= realtek_mst_i2c_spi_write_register(fd, 0x60, 0x46); // **
+ ret |= realtek_mst_i2c_spi_write_register(fd, 0x61, OPCODE_READ);
+ uint8_t block_idx = start >> 16;
+ uint8_t page_idx = start >> 8;
+ uint8_t byte_idx = start;
+ ret |= realtek_mst_i2c_spi_map_page(fd, block_idx, page_idx, byte_idx);
+ ret |= realtek_mst_i2c_spi_write_register(fd, 0x6a, 0x03);
+ ret |= realtek_mst_i2c_spi_write_register(fd, 0x60, 0x47); // **
+ if (ret)
+ return ret;
+
+ ret = realtek_mst_i2c_spi_wait_command_done(fd, 0x60, 0x01);
+ if (ret)
+ return ret;
+
+ /**
+ * The first byte is just a null, probably a status code?
+ * Advance the read by a offset of one byte and continue.
+ */
+ uint8_t dummy;
+ realtek_mst_i2c_spi_read_register(fd, 0x70, &dummy);
+
+ for (i = 0; i < len; i += PAGE_SIZE) {
+ ret |= realtek_mst_i2c_spi_read_data(fd, REGISTER_ADDRESS,
+ buf + i, min(len - i, PAGE_SIZE));
+ if (ret)
+ return ret;
+ }
+
+ return ret;
+}
+
+static int realtek_mst_i2c_spi_write_256(struct flashctx *flash, const uint8_t *buf,
+ unsigned int start, unsigned int len)
+{
+ unsigned i;
+ int ret = 0;
+
+ if (start & 0xff)
+ return default_spi_write_256(flash, buf, start, len);
+
+ int fd = get_fd_from_context(flash);
+ if (fd < 0)
+ return SPI_GENERIC_ERROR;
+
+ ret = realtek_mst_i2c_spi_disable_protection(fd);
+ if (ret)
+ return ret;
+
+ start--;
+ ret |= realtek_mst_i2c_spi_write_register(fd, 0x60, 0x46); // **
+ ret |= realtek_mst_i2c_spi_write_register(fd, 0x61, OPCODE_WRITE);
+ uint8_t block_idx = start >> 16;
+ uint8_t page_idx = start >> 8;
+ uint8_t byte_idx = start;
+ ret |= realtek_mst_i2c_spi_map_page(fd, block_idx, page_idx, byte_idx);
+ ret |= realtek_mst_i2c_spi_write_register(fd, 0x6a, 0x03);
+ ret |= realtek_mst_i2c_spi_write_register(fd, 0x60, 0x47); // **
+ if (ret)
+ goto fail;
+
+ ret = realtek_mst_i2c_spi_wait_command_done(fd, 0x60, 0x01);
+ if (ret)
+ goto fail;
+
+ for (i = 0; i < len; i += PAGE_SIZE) {
+ ret |= realtek_mst_i2c_spi_write_data(fd, REGISTER_ADDRESS,
+ (uint8_t *)buf + i, min(len - i, PAGE_SIZE));
+ if (ret)
+ break;
+ }
+
+fail:
+ /* TODO: re-enable the write protection? */
+
+ return ret;
+}
+
+static int realtek_mst_i2c_spi_write_aai(struct flashctx *flash, const uint8_t *buf,
+ unsigned int start, unsigned int len)
+{
+ msg_perr("%s: AAI write function is not supported.\n", __func__);
+ return SPI_GENERIC_ERROR;
+}
+
+static struct spi_master spi_master_i2c_realtek_mst = {
+ .max_data_read = 16,
+ .max_data_write = 8,
+ .command = realtek_mst_i2c_spi_send_command,
+ .multicommand = default_spi_send_multicommand,
+ .read = realtek_mst_i2c_spi_read,
+ .write_256 = realtek_mst_i2c_spi_write_256,
+ .write_aai = realtek_mst_i2c_spi_write_aai,
+};
+
+static int realtek_mst_i2c_spi_shutdown(void *data)
+{
+ int ret = 0;
+ struct realtek_mst_i2c_spi_data *realtek_mst_data =
+ (struct realtek_mst_i2c_spi_data *)data;
+ int fd = realtek_mst_data->fd;
+ ret |= realtek_mst_i2c_spi_reset_mpu(fd);
+ i2c_close(fd);
+ free(data);
+
+ return ret;
+}
+
+static int get_params(int *i2c_bus)
+{
+ char *bus_str = NULL;
+ int ret = SPI_GENERIC_ERROR;
+
+ bus_str = extract_programmer_param("bus");
+ if (bus_str) {
+ char *bus_suffix;
+ errno = 0;
+ int bus = (int)strtol(bus_str, &bus_suffix, 10);
+ if (errno != 0 || bus_str == bus_suffix) {
+ msg_perr("%s: Could not convert 'bus'.\n", __func__);
+ goto get_params_done;
+ }
+
+ if (bus < 0 || bus > 255) {
+ msg_perr("%s: Value for 'bus' is out of range(0-255).\n", __func__);
+ goto get_params_done;
+ }
+
+ if (strlen(bus_suffix) > 0) {
+ msg_perr("%s: Garbage following 'bus' value.\n", __func__);
+ goto get_params_done;
+ }
+
+ msg_pinfo("Using i2c bus %i.\n", bus);
+ *i2c_bus = bus;
+ ret = 0;
+ goto get_params_done;
+ } else {
+ msg_perr("%s: Bus number not specified.\n", __func__);
+ }
+get_params_done:
+ if (bus_str)
+ free(bus_str);
+
+ return ret;
+}
+
+int realtek_mst_i2c_spi_init(void)
+{
+ int ret = 0;
+ int i2c_bus = 0;
+
+ if (get_params(&i2c_bus))
+ return SPI_GENERIC_ERROR;
+
+ int fd = i2c_open(i2c_bus, REGISTER_ADDRESS, 0);
+ if (fd < 0)
+ return fd;
+
+ /* Ensure we are in a known state before entering ISP mode */
+ ret |= realtek_mst_i2c_spi_reset_mpu(fd);
+ if (ret)
+ return ret;
+
+ ret |= realtek_mst_i2c_spi_enter_isp_mode(fd);
+ if (ret)
+ return ret;
+// XXX: maybe make into a mode:defaults cli param?
+#if 0
+ ret |= realtek_mst_i2c_spi_set_defaults(fd);
+ if (ret)
+ return ret;
+#endif
+
+ struct realtek_mst_i2c_spi_data *data = calloc(1, sizeof(struct realtek_mst_i2c_spi_data));
+ if (!data) {
+ msg_perr("Unable to allocate space for extra SPI master data.\n");
+ return SPI_GENERIC_ERROR;
+ }
+
+ data->fd = fd;
+ ret |= register_shutdown(realtek_mst_i2c_spi_shutdown, data);
+
+ spi_master_i2c_realtek_mst.data = data;
+ ret |= register_spi_master(&spi_master_i2c_realtek_mst);
+
+ return ret;
+}
--
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