I2C/SMBus framework.

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2845 c046a42c-6fe2-441c-8c8c-71466251a162

1 files changed, 39 insertions, 7 deletions

diff --git a/hw/smbus.h b/hw/smbus.h
index 76fc3c8..9125896 100644
--- a/hw/smbus.h
+++ b/hw/smbus.h
@@ -25,14 +25,46 @@
 typedef struct SMBusDevice SMBusDevice;
 
 struct SMBusDevice {
-    uint8_t addr;
+    /* The SMBus protocol is implemented on top of I2C.  */
+    i2c_slave i2c;
+
+    /* Callbacks set by the device.  */
     void (*quick_cmd)(SMBusDevice *dev, uint8_t read);
     void (*send_byte)(SMBusDevice *dev, uint8_t val);
     uint8_t (*receive_byte)(SMBusDevice *dev);
-    void (*write_byte)(SMBusDevice *dev, uint8_t cmd, uint8_t val);
-    uint8_t (*read_byte)(SMBusDevice *dev, uint8_t cmd);
-    void (*write_word)(SMBusDevice *dev, uint8_t cmd, uint16_t val);
-    uint16_t (*read_word)(SMBusDevice *dev, uint8_t cmd);
-    void (*write_block)(SMBusDevice *dev, uint8_t cmd, uint8_t len, uint8_t *buf);
-    uint8_t (*read_block)(SMBusDevice *dev, uint8_t cmd, uint8_t *buf);
+    /* We can't distinguish between a word write and a block write with
+       length 1, so pass the whole data block including the length byte
+       (if present).  The device is responsible figuring out what type of
+       command  this is.  */
+    void (*write_data)(SMBusDevice *dev, uint8_t cmd, uint8_t *buf, int len);
+    /* Likewise we can't distinguish between defferent reads, or even know
+       the length of the read until the read is complete, so read data a
+       byte at a time.  The device is responsible for adding the length
+       byte on block reads.  */
+    uint8_t (*read_data)(SMBusDevice *dev, uint8_t cmd, int n);
+
+    /* Remaining fields for internal use only.  */
+    int mode;
+    int data_len;
+    uint8_t data_buf[34]; /* command + len + 32 bytes of data.  */
+    uint8_t command;
 };
+
+/* Create a slave device.  */
+SMBusDevice *smbus_device_init(i2c_bus *bus, int address, int size);
+
+/* Master device commands.  */
+void smbus_quick_command(i2c_bus *bus, int addr, int read);
+uint8_t smbus_receive_byte(i2c_bus *bus, int addr);
+void smbus_send_byte(i2c_bus *bus, int addr, uint8_t data);
+uint8_t smbus_read_byte(i2c_bus *bus, int addr, uint8_t command);
+void smbus_write_byte(i2c_bus *bus, int addr, uint8_t command, uint8_t data);
+uint16_t smbus_read_word(i2c_bus *bus, int addr, uint8_t command);
+void smbus_write_word(i2c_bus *bus, int addr, uint8_t command, uint16_t data);
+int smbus_read_block(i2c_bus *bus, int addr, uint8_t command, uint8_t *data);
+void smbus_write_block(i2c_bus *bus, int addr, uint8_t command, uint8_t *data,
+                       int len);
+
+/* smbus_eeprom.c */
+void smbus_eeprom_device_init(i2c_bus *bus, uint8_t addr, uint8_t *buf);
+