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ee6847d19b
This patch is a major overhaul of the device properties. The properties
are saved directly in the device state struct now, the linked list of
property values is gone.
Advantages:
* We don't have to maintain the list with the property values.
* The value in the property list and the value actually used by
the device can't go out of sync any more (used to happen for
the pci.devfn == -1 case) because there is only one place where
the value is stored.
* A record describing the property is required now, you can't set
random properties any more.
There are bus-specific and device-specific properties. The former
should be used for properties common to all bus drivers. Typical
use case is bus addressing, i.e. pci.devfn and i2c.address.
Properties have a PropertyInfo struct attached with name, size and
function pointers to parse and print properties. A few common property
types have PropertyInfos defined in qdev-properties.c. Drivers are free
to implement their own very special property parsers if needed.
Properties can have default values. If unset they are zero-filled.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
130 lines
3.9 KiB
C
130 lines
3.9 KiB
C
/*
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* QEMU SMBus EEPROM device
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*
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* Copyright (c) 2007 Arastra, Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "hw.h"
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#include "i2c.h"
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#include "smbus.h"
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//#define DEBUG
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typedef struct SMBusEEPROMDevice {
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SMBusDevice smbusdev;
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uint8_t *data;
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uint8_t offset;
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} SMBusEEPROMDevice;
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static void eeprom_quick_cmd(SMBusDevice *dev, uint8_t read)
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{
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#ifdef DEBUG
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printf("eeprom_quick_cmd: addr=0x%02x read=%d\n", dev->i2c.address, read);
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#endif
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}
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static void eeprom_send_byte(SMBusDevice *dev, uint8_t val)
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{
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SMBusEEPROMDevice *eeprom = (SMBusEEPROMDevice *) dev;
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#ifdef DEBUG
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printf("eeprom_send_byte: addr=0x%02x val=0x%02x\n",
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dev->i2c.address, val);
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#endif
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eeprom->offset = val;
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}
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static uint8_t eeprom_receive_byte(SMBusDevice *dev)
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{
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SMBusEEPROMDevice *eeprom = (SMBusEEPROMDevice *) dev;
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uint8_t val = eeprom->data[eeprom->offset++];
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#ifdef DEBUG
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printf("eeprom_receive_byte: addr=0x%02x val=0x%02x\n",
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dev->i2c.address, val);
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#endif
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return val;
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}
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static void eeprom_write_data(SMBusDevice *dev, uint8_t cmd, uint8_t *buf, int len)
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{
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SMBusEEPROMDevice *eeprom = (SMBusEEPROMDevice *) dev;
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int n;
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#ifdef DEBUG
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printf("eeprom_write_byte: addr=0x%02x cmd=0x%02x val=0x%02x\n",
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dev->i2c.address, cmd, buf[0]);
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#endif
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/* An page write operation is not a valid SMBus command.
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It is a block write without a length byte. Fortunately we
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get the full block anyway. */
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/* TODO: Should this set the current location? */
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if (cmd + len > 256)
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n = 256 - cmd;
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else
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n = len;
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memcpy(eeprom->data + cmd, buf, n);
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len -= n;
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if (len)
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memcpy(eeprom->data, buf + n, len);
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}
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static uint8_t eeprom_read_data(SMBusDevice *dev, uint8_t cmd, int n)
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{
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SMBusEEPROMDevice *eeprom = (SMBusEEPROMDevice *) dev;
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/* If this is the first byte then set the current position. */
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if (n == 0)
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eeprom->offset = cmd;
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/* As with writes, we implement block reads without the
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SMBus length byte. */
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return eeprom_receive_byte(dev);
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}
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static void smbus_eeprom_init(SMBusDevice *dev)
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{
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SMBusEEPROMDevice *eeprom = (SMBusEEPROMDevice *)dev;
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eeprom->offset = 0;
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}
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static SMBusDeviceInfo smbus_eeprom_info = {
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.i2c.qdev.name = "smbus-eeprom",
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.i2c.qdev.size = sizeof(SMBusEEPROMDevice),
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.i2c.qdev.props = (Property[]) {
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{
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.name = "data",
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.info = &qdev_prop_ptr,
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.offset = offsetof(SMBusEEPROMDevice, data),
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},
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{/* end of list */}
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},
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.init = smbus_eeprom_init,
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.quick_cmd = eeprom_quick_cmd,
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.send_byte = eeprom_send_byte,
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.receive_byte = eeprom_receive_byte,
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.write_data = eeprom_write_data,
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.read_data = eeprom_read_data
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};
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static void smbus_eeprom_register_devices(void)
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{
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smbus_register_device(&smbus_eeprom_info);
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}
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device_init(smbus_eeprom_register_devices)
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