src/device/smbus_ops.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <stdint.h>
   4 #include <console/console.h>
   5 #include <device/device.h>
   6 #include <device/smbus.h>
   7
   8 struct bus *get_pbus_smbus(struct device *dev)
   9 {
  10         struct bus *const pbus = i2c_link(dev);
  11         if (!pbus->dev->ops->ops_smbus_bus)
  12                 die("%s Cannot find SMBus bus operations", dev_path(dev));
  13         return pbus;
  14 }
  15
  16 #define CHECK_PRESENCE(x)                                      \
  17         if (!ops_smbus_bus(get_pbus_smbus(dev))->x) {          \
  18                 printk(BIOS_ERR, "%s missing " #x "\n",        \
  19                        dev_path(dev));                         \
  20                 return -1;                                     \
  21         }
  22
  23 int smbus_block_read(struct device *dev, u8 cmd, u8 bytes, u8 *buffer)
  24 {
  25         CHECK_PRESENCE(block_read);
  26
  27         return ops_smbus_bus(get_pbus_smbus(dev))->block_read(dev, cmd,
  28                                                               bytes, buffer);
  29 }
  30
  31 int smbus_block_write(struct device *dev, u8 cmd, u8 bytes, const u8 *buffer)
  32 {
  33         CHECK_PRESENCE(block_write);
  34
  35         return ops_smbus_bus(get_pbus_smbus(dev))->block_write(dev, cmd,
  36                                                                bytes, buffer);
  37 }