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 | 92e89eb | 2019-11-06 18:08:25 +0800 | [diff] [blame] | 20 | void I2CDevice::checkReadFuncs(int type) |
| 21 | { |
| 22 | unsigned long funcs; |
| 23 | |
| 24 | /* Check adapter functionality */ |
| 25 | if (ioctl(fd, I2C_FUNCS, &funcs) < 0) |
| 26 | { |
| 27 | throw I2CException("Failed to get funcs", busStr, devAddr, errno); |
| 28 | } |
| 29 | |
| 30 | switch (type) |
| 31 | { |
| 32 | case I2C_SMBUS_BYTE: |
| 33 | if (!(funcs & I2C_FUNC_SMBUS_READ_BYTE)) |
| 34 | { |
| 35 | throw I2CException("Missing SMBUS_READ_BYTE", busStr, devAddr); |
| 36 | } |
| 37 | break; |
| 38 | case I2C_SMBUS_BYTE_DATA: |
| 39 | if (!(funcs & I2C_FUNC_SMBUS_READ_BYTE_DATA)) |
| 40 | { |
| 41 | throw I2CException("Missing SMBUS_READ_BYTE_DATA", busStr, |
| 42 | devAddr); |
| 43 | } |
| 44 | break; |
| 45 | |
| 46 | case I2C_SMBUS_WORD_DATA: |
| 47 | if (!(funcs & I2C_FUNC_SMBUS_READ_WORD_DATA)) |
| 48 | { |
| 49 | throw I2CException("Missing SMBUS_READ_WORD_DATA", busStr, |
| 50 | devAddr); |
| 51 | } |
| 52 | break; |
| 53 | case I2C_SMBUS_BLOCK_DATA: |
| 54 | if (!(funcs & I2C_FUNC_SMBUS_READ_BLOCK_DATA)) |
| 55 | { |
| 56 | throw I2CException("Missing SMBUS_READ_BLOCK_DATA", busStr, |
| 57 | devAddr); |
| 58 | } |
| 59 | break; |
Lei YU | 1d10342 | 2019-11-29 14:00:02 +0800 | [diff] [blame] | 60 | case I2C_SMBUS_I2C_BLOCK_DATA: |
| 61 | if (!(funcs & I2C_FUNC_SMBUS_READ_I2C_BLOCK)) |
| 62 | { |
| 63 | throw I2CException("Missing I2C_FUNC_SMBUS_READ_I2C_BLOCK", |
| 64 | busStr, devAddr); |
| 65 | } |
| 66 | break; |
Lei YU | 92e89eb | 2019-11-06 18:08:25 +0800 | [diff] [blame] | 67 | default: |
| 68 | fprintf(stderr, "Unexpected read size type: %d\n", type); |
| 69 | assert(false); |
| 70 | break; |
| 71 | } |
| 72 | } |
| 73 | |
Lei YU | 34fb8bd | 2019-11-07 14:24:20 +0800 | [diff] [blame] | 74 | void I2CDevice::checkWriteFuncs(int type) |
| 75 | { |
| 76 | unsigned long funcs; |
| 77 | |
| 78 | /* Check adapter functionality */ |
| 79 | if (ioctl(fd, I2C_FUNCS, &funcs) < 0) |
| 80 | { |
| 81 | throw I2CException("Failed to get funcs", busStr, devAddr, errno); |
| 82 | } |
| 83 | |
| 84 | switch (type) |
| 85 | { |
| 86 | case I2C_SMBUS_BYTE: |
| 87 | if (!(funcs & I2C_FUNC_SMBUS_WRITE_BYTE)) |
| 88 | { |
| 89 | throw I2CException("Missing SMBUS_WRITE_BYTE", busStr, devAddr); |
| 90 | } |
| 91 | break; |
| 92 | case I2C_SMBUS_BYTE_DATA: |
| 93 | if (!(funcs & I2C_FUNC_SMBUS_WRITE_BYTE_DATA)) |
| 94 | { |
| 95 | throw I2CException("Missing SMBUS_WRITE_BYTE_DATA", busStr, |
| 96 | devAddr); |
| 97 | } |
| 98 | break; |
| 99 | |
| 100 | case I2C_SMBUS_WORD_DATA: |
| 101 | if (!(funcs & I2C_FUNC_SMBUS_WRITE_WORD_DATA)) |
| 102 | { |
| 103 | throw I2CException("Missing SMBUS_WRITE_WORD_DATA", busStr, |
| 104 | devAddr); |
| 105 | } |
| 106 | break; |
| 107 | case I2C_SMBUS_BLOCK_DATA: |
| 108 | if (!(funcs & I2C_FUNC_SMBUS_WRITE_BLOCK_DATA)) |
| 109 | { |
| 110 | throw I2CException("Missing SMBUS_WRITE_BLOCK_DATA", busStr, |
| 111 | devAddr); |
| 112 | } |
| 113 | break; |
Lei YU | 1d10342 | 2019-11-29 14:00:02 +0800 | [diff] [blame] | 114 | case I2C_SMBUS_I2C_BLOCK_DATA: |
| 115 | if (!(funcs & I2C_FUNC_SMBUS_WRITE_I2C_BLOCK)) |
| 116 | { |
| 117 | throw I2CException("Missing I2C_FUNC_SMBUS_WRITE_I2C_BLOCK", |
| 118 | busStr, devAddr); |
| 119 | } |
| 120 | break; |
Lei YU | 34fb8bd | 2019-11-07 14:24:20 +0800 | [diff] [blame] | 121 | default: |
| 122 | fprintf(stderr, "Unexpected read size type: %d\n", type); |
| 123 | assert(false); |
| 124 | } |
| 125 | } |
| 126 | |
Shawn McCarney | d45a9a6 | 2019-12-10 18:35:44 -0600 | [diff] [blame^] | 127 | void I2CDevice::open() |
| 128 | { |
| 129 | if (isOpen()) |
| 130 | { |
| 131 | throw I2CException("Device already open", busStr, devAddr); |
| 132 | } |
| 133 | |
| 134 | fd = ::open(busStr.c_str(), O_RDWR); |
| 135 | if (fd == -1) |
| 136 | { |
| 137 | throw I2CException("Failed to open", busStr, devAddr, errno); |
| 138 | } |
| 139 | |
| 140 | if (ioctl(fd, I2C_SLAVE, devAddr) < 0) |
| 141 | { |
| 142 | // Close device since setting slave address failed |
| 143 | closeWithoutException(); |
| 144 | |
| 145 | throw I2CException("Failed to set I2C_SLAVE", busStr, devAddr, errno); |
| 146 | } |
| 147 | } |
| 148 | |
| 149 | void I2CDevice::close() |
| 150 | { |
| 151 | checkIsOpen(); |
| 152 | if (::close(fd) == -1) |
| 153 | { |
| 154 | throw I2CException("Failed to close", busStr, devAddr, errno); |
| 155 | } |
| 156 | fd = INVALID_FD; |
| 157 | } |
| 158 | |
Lei YU | ab1327c | 2019-11-04 16:53:39 +0800 | [diff] [blame] | 159 | void I2CDevice::read(uint8_t& data) |
| 160 | { |
Shawn McCarney | d45a9a6 | 2019-12-10 18:35:44 -0600 | [diff] [blame^] | 161 | checkIsOpen(); |
Lei YU | 92e89eb | 2019-11-06 18:08:25 +0800 | [diff] [blame] | 162 | checkReadFuncs(I2C_SMBUS_BYTE); |
| 163 | |
| 164 | int ret = i2c_smbus_read_byte(fd); |
| 165 | if (ret < 0) |
| 166 | { |
| 167 | throw I2CException("Failed to read byte", busStr, devAddr, errno); |
| 168 | } |
| 169 | data = static_cast<uint8_t>(ret); |
Lei YU | ab1327c | 2019-11-04 16:53:39 +0800 | [diff] [blame] | 170 | } |
| 171 | |
| 172 | void I2CDevice::read(uint8_t addr, uint8_t& data) |
| 173 | { |
Shawn McCarney | d45a9a6 | 2019-12-10 18:35:44 -0600 | [diff] [blame^] | 174 | checkIsOpen(); |
Lei YU | 92e89eb | 2019-11-06 18:08:25 +0800 | [diff] [blame] | 175 | checkReadFuncs(I2C_SMBUS_BYTE_DATA); |
| 176 | |
| 177 | int ret = i2c_smbus_read_byte_data(fd, addr); |
| 178 | if (ret < 0) |
| 179 | { |
| 180 | throw I2CException("Failed to read byte data", busStr, devAddr, errno); |
| 181 | } |
| 182 | data = static_cast<uint8_t>(ret); |
Lei YU | ab1327c | 2019-11-04 16:53:39 +0800 | [diff] [blame] | 183 | } |
| 184 | |
| 185 | void I2CDevice::read(uint8_t addr, uint16_t& data) |
| 186 | { |
Shawn McCarney | d45a9a6 | 2019-12-10 18:35:44 -0600 | [diff] [blame^] | 187 | checkIsOpen(); |
Lei YU | 92e89eb | 2019-11-06 18:08:25 +0800 | [diff] [blame] | 188 | checkReadFuncs(I2C_SMBUS_WORD_DATA); |
| 189 | int ret = i2c_smbus_read_word_data(fd, addr); |
| 190 | if (ret < 0) |
| 191 | { |
| 192 | throw I2CException("Failed to read word data", busStr, devAddr, errno); |
| 193 | } |
| 194 | data = static_cast<uint16_t>(ret); |
Lei YU | ab1327c | 2019-11-04 16:53:39 +0800 | [diff] [blame] | 195 | } |
| 196 | |
Lei YU | 1d10342 | 2019-11-29 14:00:02 +0800 | [diff] [blame] | 197 | void I2CDevice::read(uint8_t addr, uint8_t& size, uint8_t* data, Mode mode) |
Lei YU | ab1327c | 2019-11-04 16:53:39 +0800 | [diff] [blame] | 198 | { |
Shawn McCarney | d45a9a6 | 2019-12-10 18:35:44 -0600 | [diff] [blame^] | 199 | checkIsOpen(); |
Lei YU | 1d10342 | 2019-11-29 14:00:02 +0800 | [diff] [blame] | 200 | int ret; |
| 201 | switch (mode) |
| 202 | { |
| 203 | case Mode::SMBUS: |
| 204 | checkReadFuncs(I2C_SMBUS_BLOCK_DATA); |
| 205 | ret = i2c_smbus_read_block_data(fd, addr, data); |
| 206 | break; |
| 207 | case Mode::I2C: |
| 208 | checkReadFuncs(I2C_SMBUS_I2C_BLOCK_DATA); |
| 209 | ret = i2c_smbus_read_i2c_block_data(fd, addr, size, data); |
| 210 | if (ret != size) |
| 211 | { |
| 212 | throw I2CException("Failed to read i2c block data", busStr, |
| 213 | devAddr, errno); |
| 214 | } |
| 215 | break; |
| 216 | } |
Lei YU | 92e89eb | 2019-11-06 18:08:25 +0800 | [diff] [blame] | 217 | if (ret < 0) |
| 218 | { |
| 219 | throw I2CException("Failed to read block data", busStr, devAddr, errno); |
| 220 | } |
| 221 | size = static_cast<uint8_t>(ret); |
Lei YU | ab1327c | 2019-11-04 16:53:39 +0800 | [diff] [blame] | 222 | } |
| 223 | |
| 224 | void I2CDevice::write(uint8_t data) |
| 225 | { |
Shawn McCarney | d45a9a6 | 2019-12-10 18:35:44 -0600 | [diff] [blame^] | 226 | checkIsOpen(); |
Lei YU | 34fb8bd | 2019-11-07 14:24:20 +0800 | [diff] [blame] | 227 | checkWriteFuncs(I2C_SMBUS_BYTE); |
| 228 | |
| 229 | if (i2c_smbus_write_byte(fd, data) < 0) |
| 230 | { |
| 231 | throw I2CException("Failed to write byte", busStr, devAddr, errno); |
| 232 | } |
Lei YU | ab1327c | 2019-11-04 16:53:39 +0800 | [diff] [blame] | 233 | } |
| 234 | |
| 235 | void I2CDevice::write(uint8_t addr, uint8_t data) |
| 236 | { |
Shawn McCarney | d45a9a6 | 2019-12-10 18:35:44 -0600 | [diff] [blame^] | 237 | checkIsOpen(); |
Lei YU | 34fb8bd | 2019-11-07 14:24:20 +0800 | [diff] [blame] | 238 | checkWriteFuncs(I2C_SMBUS_BYTE_DATA); |
| 239 | |
| 240 | if (i2c_smbus_write_byte_data(fd, addr, data) < 0) |
| 241 | { |
| 242 | throw I2CException("Failed to write byte data", busStr, devAddr, errno); |
| 243 | } |
Lei YU | ab1327c | 2019-11-04 16:53:39 +0800 | [diff] [blame] | 244 | } |
| 245 | |
| 246 | void I2CDevice::write(uint8_t addr, uint16_t data) |
| 247 | { |
Shawn McCarney | d45a9a6 | 2019-12-10 18:35:44 -0600 | [diff] [blame^] | 248 | checkIsOpen(); |
Lei YU | 34fb8bd | 2019-11-07 14:24:20 +0800 | [diff] [blame] | 249 | checkWriteFuncs(I2C_SMBUS_WORD_DATA); |
| 250 | |
| 251 | if (i2c_smbus_write_word_data(fd, addr, data) < 0) |
| 252 | { |
| 253 | throw I2CException("Failed to write word data", busStr, devAddr, errno); |
| 254 | } |
Lei YU | ab1327c | 2019-11-04 16:53:39 +0800 | [diff] [blame] | 255 | } |
| 256 | |
Lei YU | 1d10342 | 2019-11-29 14:00:02 +0800 | [diff] [blame] | 257 | void I2CDevice::write(uint8_t addr, uint8_t size, const uint8_t* data, |
| 258 | Mode mode) |
Lei YU | ab1327c | 2019-11-04 16:53:39 +0800 | [diff] [blame] | 259 | { |
Shawn McCarney | d45a9a6 | 2019-12-10 18:35:44 -0600 | [diff] [blame^] | 260 | checkIsOpen(); |
Lei YU | 1d10342 | 2019-11-29 14:00:02 +0800 | [diff] [blame] | 261 | int ret; |
| 262 | switch (mode) |
| 263 | { |
| 264 | case Mode::SMBUS: |
| 265 | checkWriteFuncs(I2C_SMBUS_BLOCK_DATA); |
| 266 | ret = i2c_smbus_write_block_data(fd, addr, size, data); |
| 267 | break; |
| 268 | case Mode::I2C: |
| 269 | checkWriteFuncs(I2C_SMBUS_I2C_BLOCK_DATA); |
| 270 | ret = i2c_smbus_write_i2c_block_data(fd, addr, size, data); |
| 271 | break; |
| 272 | } |
| 273 | if (ret < 0) |
Lei YU | 34fb8bd | 2019-11-07 14:24:20 +0800 | [diff] [blame] | 274 | { |
| 275 | throw I2CException("Failed to write block data", busStr, devAddr, |
| 276 | errno); |
| 277 | } |
Lei YU | ab1327c | 2019-11-04 16:53:39 +0800 | [diff] [blame] | 278 | } |
| 279 | |
Shawn McCarney | d45a9a6 | 2019-12-10 18:35:44 -0600 | [diff] [blame^] | 280 | std::unique_ptr<I2CInterface> I2CDevice::create(uint8_t busId, uint8_t devAddr, |
| 281 | InitialState initialState) |
Lei YU | ab1327c | 2019-11-04 16:53:39 +0800 | [diff] [blame] | 282 | { |
Shawn McCarney | d45a9a6 | 2019-12-10 18:35:44 -0600 | [diff] [blame^] | 283 | std::unique_ptr<I2CDevice> dev(new I2CDevice(busId, devAddr, initialState)); |
Lei YU | ab1327c | 2019-11-04 16:53:39 +0800 | [diff] [blame] | 284 | return dev; |
| 285 | } |
| 286 | |
Shawn McCarney | d45a9a6 | 2019-12-10 18:35:44 -0600 | [diff] [blame^] | 287 | std::unique_ptr<I2CInterface> create(uint8_t busId, uint8_t devAddr, |
| 288 | I2CInterface::InitialState initialState) |
Lei YU | ab1327c | 2019-11-04 16:53:39 +0800 | [diff] [blame] | 289 | { |
Shawn McCarney | d45a9a6 | 2019-12-10 18:35:44 -0600 | [diff] [blame^] | 290 | return I2CDevice::create(busId, devAddr, initialState); |
Lei YU | ab1327c | 2019-11-04 16:53:39 +0800 | [diff] [blame] | 291 | } |
| 292 | |
| 293 | } // namespace i2c |