Lei YU | ab1327c | 2019-11-04 16:53:39 +0800 | [diff] [blame] | 1 | #include "i2c.hpp" |
| 2 | |
Lei YU | 9af82a5 | 2019-11-06 14:51:22 +0800 | [diff] [blame] | 3 | #include <fcntl.h> |
Lei YU | 92e89eb | 2019-11-06 18:08:25 +0800 | [diff] [blame] | 4 | #include <sys/ioctl.h> |
Lei YU | 9af82a5 | 2019-11-06 14:51:22 +0800 | [diff] [blame] | 5 | #include <sys/stat.h> |
| 6 | #include <unistd.h> |
| 7 | |
Lei YU | 92e89eb | 2019-11-06 18:08:25 +0800 | [diff] [blame] | 8 | #include <cassert> |
Lei YU | 9af82a5 | 2019-11-06 14:51:22 +0800 | [diff] [blame] | 9 | #include <cerrno> |
| 10 | |
Lei YU | 92e89eb | 2019-11-06 18:08:25 +0800 | [diff] [blame] | 11 | extern "C" { |
| 12 | #include <i2c/smbus.h> |
| 13 | #include <linux/i2c-dev.h> |
| 14 | #include <linux/i2c.h> |
| 15 | } |
| 16 | |
Lei YU | ab1327c | 2019-11-04 16:53:39 +0800 | [diff] [blame] | 17 | namespace i2c |
| 18 | { |
| 19 | |
Lei YU | 9af82a5 | 2019-11-06 14:51:22 +0800 | [diff] [blame] | 20 | void I2CDevice::open() |
| 21 | { |
| 22 | fd = ::open(busStr.c_str(), O_RDWR); |
| 23 | if (fd == -1) |
| 24 | { |
| 25 | throw I2CException("Failed to open", busStr, devAddr, errno); |
| 26 | } |
Lei YU | 92e89eb | 2019-11-06 18:08:25 +0800 | [diff] [blame] | 27 | |
| 28 | if (ioctl(fd, I2C_SLAVE, devAddr) < 0) |
| 29 | { |
| 30 | throw I2CException("Failed to set I2C_SLAVE", busStr, devAddr, errno); |
| 31 | } |
Lei YU | 9af82a5 | 2019-11-06 14:51:22 +0800 | [diff] [blame] | 32 | } |
| 33 | |
| 34 | void I2CDevice::close() |
| 35 | { |
| 36 | ::close(fd); |
| 37 | } |
| 38 | |
Lei YU | 92e89eb | 2019-11-06 18:08:25 +0800 | [diff] [blame] | 39 | void I2CDevice::checkReadFuncs(int type) |
| 40 | { |
| 41 | unsigned long funcs; |
| 42 | |
| 43 | /* Check adapter functionality */ |
| 44 | if (ioctl(fd, I2C_FUNCS, &funcs) < 0) |
| 45 | { |
| 46 | throw I2CException("Failed to get funcs", busStr, devAddr, errno); |
| 47 | } |
| 48 | |
| 49 | switch (type) |
| 50 | { |
| 51 | case I2C_SMBUS_BYTE: |
| 52 | if (!(funcs & I2C_FUNC_SMBUS_READ_BYTE)) |
| 53 | { |
| 54 | throw I2CException("Missing SMBUS_READ_BYTE", busStr, devAddr); |
| 55 | } |
| 56 | break; |
| 57 | case I2C_SMBUS_BYTE_DATA: |
| 58 | if (!(funcs & I2C_FUNC_SMBUS_READ_BYTE_DATA)) |
| 59 | { |
| 60 | throw I2CException("Missing SMBUS_READ_BYTE_DATA", busStr, |
| 61 | devAddr); |
| 62 | } |
| 63 | break; |
| 64 | |
| 65 | case I2C_SMBUS_WORD_DATA: |
| 66 | if (!(funcs & I2C_FUNC_SMBUS_READ_WORD_DATA)) |
| 67 | { |
| 68 | throw I2CException("Missing SMBUS_READ_WORD_DATA", busStr, |
| 69 | devAddr); |
| 70 | } |
| 71 | break; |
| 72 | case I2C_SMBUS_BLOCK_DATA: |
| 73 | if (!(funcs & I2C_FUNC_SMBUS_READ_BLOCK_DATA)) |
| 74 | { |
| 75 | throw I2CException("Missing SMBUS_READ_BLOCK_DATA", busStr, |
| 76 | devAddr); |
| 77 | } |
| 78 | break; |
| 79 | default: |
| 80 | fprintf(stderr, "Unexpected read size type: %d\n", type); |
| 81 | assert(false); |
| 82 | break; |
| 83 | } |
| 84 | } |
| 85 | |
Lei YU | 34fb8bd | 2019-11-07 14:24:20 +0800 | [diff] [blame^] | 86 | void I2CDevice::checkWriteFuncs(int type) |
| 87 | { |
| 88 | unsigned long funcs; |
| 89 | |
| 90 | /* Check adapter functionality */ |
| 91 | if (ioctl(fd, I2C_FUNCS, &funcs) < 0) |
| 92 | { |
| 93 | throw I2CException("Failed to get funcs", busStr, devAddr, errno); |
| 94 | } |
| 95 | |
| 96 | switch (type) |
| 97 | { |
| 98 | case I2C_SMBUS_BYTE: |
| 99 | if (!(funcs & I2C_FUNC_SMBUS_WRITE_BYTE)) |
| 100 | { |
| 101 | throw I2CException("Missing SMBUS_WRITE_BYTE", busStr, devAddr); |
| 102 | } |
| 103 | break; |
| 104 | case I2C_SMBUS_BYTE_DATA: |
| 105 | if (!(funcs & I2C_FUNC_SMBUS_WRITE_BYTE_DATA)) |
| 106 | { |
| 107 | throw I2CException("Missing SMBUS_WRITE_BYTE_DATA", busStr, |
| 108 | devAddr); |
| 109 | } |
| 110 | break; |
| 111 | |
| 112 | case I2C_SMBUS_WORD_DATA: |
| 113 | if (!(funcs & I2C_FUNC_SMBUS_WRITE_WORD_DATA)) |
| 114 | { |
| 115 | throw I2CException("Missing SMBUS_WRITE_WORD_DATA", busStr, |
| 116 | devAddr); |
| 117 | } |
| 118 | break; |
| 119 | case I2C_SMBUS_BLOCK_DATA: |
| 120 | if (!(funcs & I2C_FUNC_SMBUS_WRITE_BLOCK_DATA)) |
| 121 | { |
| 122 | throw I2CException("Missing SMBUS_WRITE_BLOCK_DATA", busStr, |
| 123 | devAddr); |
| 124 | } |
| 125 | break; |
| 126 | default: |
| 127 | fprintf(stderr, "Unexpected read size type: %d\n", type); |
| 128 | assert(false); |
| 129 | } |
| 130 | } |
| 131 | |
Lei YU | ab1327c | 2019-11-04 16:53:39 +0800 | [diff] [blame] | 132 | void I2CDevice::read(uint8_t& data) |
| 133 | { |
Lei YU | 92e89eb | 2019-11-06 18:08:25 +0800 | [diff] [blame] | 134 | checkReadFuncs(I2C_SMBUS_BYTE); |
| 135 | |
| 136 | int ret = i2c_smbus_read_byte(fd); |
| 137 | if (ret < 0) |
| 138 | { |
| 139 | throw I2CException("Failed to read byte", busStr, devAddr, errno); |
| 140 | } |
| 141 | data = static_cast<uint8_t>(ret); |
Lei YU | ab1327c | 2019-11-04 16:53:39 +0800 | [diff] [blame] | 142 | } |
| 143 | |
| 144 | void I2CDevice::read(uint8_t addr, uint8_t& data) |
| 145 | { |
Lei YU | 92e89eb | 2019-11-06 18:08:25 +0800 | [diff] [blame] | 146 | checkReadFuncs(I2C_SMBUS_BYTE_DATA); |
| 147 | |
| 148 | int ret = i2c_smbus_read_byte_data(fd, addr); |
| 149 | if (ret < 0) |
| 150 | { |
| 151 | throw I2CException("Failed to read byte data", busStr, devAddr, errno); |
| 152 | } |
| 153 | data = static_cast<uint8_t>(ret); |
Lei YU | ab1327c | 2019-11-04 16:53:39 +0800 | [diff] [blame] | 154 | } |
| 155 | |
| 156 | void I2CDevice::read(uint8_t addr, uint16_t& data) |
| 157 | { |
Lei YU | 92e89eb | 2019-11-06 18:08:25 +0800 | [diff] [blame] | 158 | checkReadFuncs(I2C_SMBUS_WORD_DATA); |
| 159 | int ret = i2c_smbus_read_word_data(fd, addr); |
| 160 | if (ret < 0) |
| 161 | { |
| 162 | throw I2CException("Failed to read word data", busStr, devAddr, errno); |
| 163 | } |
| 164 | data = static_cast<uint16_t>(ret); |
Lei YU | ab1327c | 2019-11-04 16:53:39 +0800 | [diff] [blame] | 165 | } |
| 166 | |
| 167 | void I2CDevice::read(uint8_t addr, uint8_t& size, uint8_t* data) |
| 168 | { |
Lei YU | 92e89eb | 2019-11-06 18:08:25 +0800 | [diff] [blame] | 169 | checkReadFuncs(I2C_SMBUS_BLOCK_DATA); |
| 170 | |
| 171 | int ret = i2c_smbus_read_block_data(fd, addr, data); |
| 172 | if (ret < 0) |
| 173 | { |
| 174 | throw I2CException("Failed to read block data", busStr, devAddr, errno); |
| 175 | } |
| 176 | size = static_cast<uint8_t>(ret); |
Lei YU | ab1327c | 2019-11-04 16:53:39 +0800 | [diff] [blame] | 177 | } |
| 178 | |
| 179 | void I2CDevice::write(uint8_t data) |
| 180 | { |
Lei YU | 34fb8bd | 2019-11-07 14:24:20 +0800 | [diff] [blame^] | 181 | checkWriteFuncs(I2C_SMBUS_BYTE); |
| 182 | |
| 183 | if (i2c_smbus_write_byte(fd, data) < 0) |
| 184 | { |
| 185 | throw I2CException("Failed to write byte", busStr, devAddr, errno); |
| 186 | } |
Lei YU | ab1327c | 2019-11-04 16:53:39 +0800 | [diff] [blame] | 187 | } |
| 188 | |
| 189 | void I2CDevice::write(uint8_t addr, uint8_t data) |
| 190 | { |
Lei YU | 34fb8bd | 2019-11-07 14:24:20 +0800 | [diff] [blame^] | 191 | checkWriteFuncs(I2C_SMBUS_BYTE_DATA); |
| 192 | |
| 193 | if (i2c_smbus_write_byte_data(fd, addr, data) < 0) |
| 194 | { |
| 195 | throw I2CException("Failed to write byte data", busStr, devAddr, errno); |
| 196 | } |
Lei YU | ab1327c | 2019-11-04 16:53:39 +0800 | [diff] [blame] | 197 | } |
| 198 | |
| 199 | void I2CDevice::write(uint8_t addr, uint16_t data) |
| 200 | { |
Lei YU | 34fb8bd | 2019-11-07 14:24:20 +0800 | [diff] [blame^] | 201 | checkWriteFuncs(I2C_SMBUS_WORD_DATA); |
| 202 | |
| 203 | if (i2c_smbus_write_word_data(fd, addr, data) < 0) |
| 204 | { |
| 205 | throw I2CException("Failed to write word data", busStr, devAddr, errno); |
| 206 | } |
Lei YU | ab1327c | 2019-11-04 16:53:39 +0800 | [diff] [blame] | 207 | } |
| 208 | |
| 209 | void I2CDevice::write(uint8_t addr, uint8_t size, const uint8_t* data) |
| 210 | { |
Lei YU | 34fb8bd | 2019-11-07 14:24:20 +0800 | [diff] [blame^] | 211 | checkWriteFuncs(I2C_SMBUS_BLOCK_DATA); |
| 212 | |
| 213 | if (i2c_smbus_write_block_data(fd, addr, size, data) < 0) |
| 214 | { |
| 215 | throw I2CException("Failed to write block data", busStr, devAddr, |
| 216 | errno); |
| 217 | } |
Lei YU | ab1327c | 2019-11-04 16:53:39 +0800 | [diff] [blame] | 218 | } |
| 219 | |
| 220 | std::unique_ptr<I2CInterface> I2CDevice::create(uint8_t busId, uint8_t devAddr) |
| 221 | { |
| 222 | std::unique_ptr<I2CDevice> dev(new I2CDevice(busId, devAddr)); |
| 223 | return dev; |
| 224 | } |
| 225 | |
| 226 | std::unique_ptr<I2CInterface> create(uint8_t busId, uint8_t devAddr) |
| 227 | { |
| 228 | return I2CDevice::create(busId, devAddr); |
| 229 | } |
| 230 | |
| 231 | } // namespace i2c |