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authorpbrook <pbrook@c046a42c-6fe2-441c-8c8c-71466251a162>2007-05-23 00:03:59 +0000
committerpbrook <pbrook@c046a42c-6fe2-441c-8c8c-71466251a162>2007-05-23 00:03:59 +0000
commit0ff596d02fd9d876a31d038255a6d4f89da9dfed (patch)
tree754c9dfaee7006ab91d80333141835d9213a6d06 /hw/smbus.h
parentc6fdf5fca0149fbc2d05d8d5ad43e3686c37514e (diff)
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I2C/SMBus framework.
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2845 c046a42c-6fe2-441c-8c8c-71466251a162
Diffstat (limited to 'hw/smbus.h')
-rw-r--r--hw/smbus.h46
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);
+