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  }