Atmosphere/stratosphere/boot/source/boot_i2c_utils.cpp
2020-02-22 23:05:14 -08:00

74 lines
2.9 KiB
C++

/*
* Copyright (c) 2018-2020 Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "boot_i2c_utils.hpp"
namespace ams::boot {
namespace {
template<typename F>
constexpr Result RetryUntilSuccess(F f) {
constexpr u64 timeout = 10'000'000'000ul;
constexpr u64 retry_interval = 20'000'000ul;
u64 cur_time = 0;
while (true) {
const auto retry_result = f();
R_UNLESS(R_FAILED(retry_result), ResultSuccess());
cur_time += retry_interval;
if (cur_time < timeout) {
svcSleepThread(retry_interval);
continue;
}
return retry_result;
}
}
}
Result ReadI2cRegister(i2c::driver::Session &session, u8 *dst, size_t dst_size, const u8 *cmd, size_t cmd_size) {
AMS_ABORT_UNLESS(dst != nullptr && dst_size > 0);
AMS_ABORT_UNLESS(cmd != nullptr && cmd_size > 0);
u8 cmd_list[i2c::CommandListFormatter::MaxCommandListSize];
i2c::CommandListFormatter formatter(cmd_list, sizeof(cmd_list));
R_ABORT_UNLESS(formatter.EnqueueSendCommand(I2cTransactionOption_Start, cmd, cmd_size));
R_ABORT_UNLESS(formatter.EnqueueReceiveCommand(static_cast<I2cTransactionOption>(I2cTransactionOption_Start | I2cTransactionOption_Stop), dst_size));
return RetryUntilSuccess([&]() { return i2c::driver::ExecuteCommandList(session, dst, dst_size, cmd_list, formatter.GetCurrentSize()); });
}
Result WriteI2cRegister(i2c::driver::Session &session, const u8 *src, size_t src_size, const u8 *cmd, size_t cmd_size) {
AMS_ABORT_UNLESS(src != nullptr && src_size > 0);
AMS_ABORT_UNLESS(cmd != nullptr && cmd_size > 0);
u8 cmd_list[0x20];
/* N doesn't use a CommandListFormatter here... */
std::memcpy(&cmd_list[0], cmd, cmd_size);
std::memcpy(&cmd_list[cmd_size], src, src_size);
return RetryUntilSuccess([&]() { return i2c::driver::Send(session, cmd_list, src_size + cmd_size, static_cast<I2cTransactionOption>(I2cTransactionOption_Start | I2cTransactionOption_Stop)); });
}
Result WriteI2cRegister(i2c::driver::Session &session, const u8 address, const u8 value) {
return WriteI2cRegister(session, &value, sizeof(value), &address, sizeof(address));
}
}