src/include/device/smbus.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #ifndef DEVICE_SMBUS_H
   4 #define DEVICE_SMBUS_H
   5
   6 #include <stdint.h>
   7 #include <device/device.h>
   8 #include <device/i2c_bus.h>
   9
  10 /* Common SMBus bus operations */
  11 struct smbus_bus_operations {
  12         int (*recv_byte)(struct device *dev);
  13         int (*send_byte)(struct device *dev, u8 value);
  14         int (*read_byte)(struct device *dev, u8 addr);
  15         int (*write_byte)(struct device *dev, u8 addr, u8 value);
  16         int (*block_read)(struct device *dev, u8 cmd, u8 bytes, u8 *buffer);
  17         int (*block_write)(struct device *dev, u8 cmd, u8 bytes,
  18                            const u8 *buffer);
  19 };
  20
  21 static inline const struct smbus_bus_operations *ops_smbus_bus(struct bus *bus)
  22 {
  23         const struct smbus_bus_operations *bops;
  24
  25         bops = 0;
  26         if (bus && bus->dev && bus->dev->ops)
  27                 bops = bus->dev->ops->ops_smbus_bus;
  28
  29         return bops;
  30 }
  31
  32 struct bus *get_pbus_smbus(struct device *dev);
  33
  34 #if !DEVTREE_EARLY
  35 static inline int smbus_recv_byte(struct device *const dev)
  36 {
  37         return i2c_dev_readb(dev);
  38 }
  39
  40 static inline int smbus_send_byte(struct device *const dev, u8 byte)
  41 {
  42         return i2c_dev_writeb(dev, byte);
  43 }
  44
  45 static inline int smbus_read_byte(struct device *const dev, u8 addr)
  46 {
  47         return i2c_dev_readb_at(dev, addr);
  48 }
  49
  50 static inline int smbus_write_byte(struct device *const dev, u8 addr, u8 val)
  51 {
  52         return i2c_dev_writeb_at(dev, addr, val);
  53 }
  54
  55 int smbus_block_read(struct device *dev, u8 cmd, u8 bytes, u8 *buffer);
  56 int smbus_block_write(struct device *dev, u8 cmd, u8 bytes, const u8 *buffer);
  57 #endif
  58
  59 #endif /* DEVICE_SMBUS_H */