src/devices/smbus_ops.c

#include <console/console.h>
#include <stdint.h>
#include <device/device.h>
#include <device/path.h>
#include <device/smbus.h>

struct bus *get_pbus_smbus(device_t dev)
{
	struct bus *pbus = dev->bus;
	while (pbus && pbus->dev && !ops_smbus_bus(pbus)) {
		pbus = pbus->dev->bus;
	}
	if (!pbus || !pbus->dev || !pbus->dev->ops || !pbus->dev->ops->ops_smbus_bus) {
		printk_alert("%s Cannot find smbus bus operations", dev_path(dev));
		die("");
		for(;;);
	}
	return pbus;
}

/*multi level i2c MUX??? may need to find the first i2c device and then set link
 * down to current dev
  1 store get_pbus_smbus list link
  2 reverse the link and call set link */

int smbus_set_link(device_t dev)
{
	struct bus *pbus_a[4]; // 4 level mux only. Enough?
        struct bus *pbus = dev->bus;
	int pbus_num=0;
	int i;
        while(pbus && pbus->dev && (pbus->dev->path.type==DEVICE_PATH_I2C)) {
		pbus_a[pbus_num++] = pbus;
                pbus = pbus->dev->bus;
        }
//	printk_info("smbus_set_link: ");
	for (i=pbus_num-1; i>=0; i--) {
//		printk_info(" %s[%d] -> ", dev_path(pbus_a[i]->dev), pbus_a[i]->link);
        	if (ops_smbus_bus(get_pbus_smbus(pbus_a[i]->dev))) {
                	if (pbus_a[i]->dev->ops && pbus_a[i]->dev->ops->set_link)
                        	pbus_a[i]->dev->ops->set_link(pbus_a[i]->dev, pbus_a[i]->link);
		}
	}
//	printk_info(" %s\n", dev_path(dev));

        return pbus_num;
}

int smbus_quick_read(device_t dev)
{
	return ops_smbus_bus(get_pbus_smbus(dev))->quick_read(dev);
}
int smbus_quick_write(device_t dev)
{
	return ops_smbus_bus(get_pbus_smbus(dev))->quick_write(dev);
}
int smbus_recv_byte(device_t dev)
{
	return ops_smbus_bus(get_pbus_smbus(dev))->recv_byte(dev);
}
int smbus_send_byte(device_t dev, uint8_t byte)
{
	return ops_smbus_bus(get_pbus_smbus(dev))->send_byte(dev, byte);
}
int smbus_read_byte(device_t dev, uint8_t addr)
{
	return ops_smbus_bus(get_pbus_smbus(dev))->read_byte(dev, addr);
}
int smbus_write_byte(device_t dev, uint8_t addr, uint8_t val)
{
	return ops_smbus_bus(get_pbus_smbus(dev))->write_byte(dev, addr, val);
}
int smbus_read_word(device_t dev, uint8_t addr)
{
	return ops_smbus_bus(get_pbus_smbus(dev))->read_word(dev, addr);
}
int smbus_write_word(device_t dev, uint8_t addr, uint16_t val)
{
	return ops_smbus_bus(get_pbus_smbus(dev))->write_word(dev, addr, val);
}
int smbus_process_call(device_t dev, uint8_t cmd, uint16_t data)
{
	return ops_smbus_bus(get_pbus_smbus(dev))->process_call(dev, cmd, data);
}
int smbus_block_read(device_t dev, uint8_t cmd, uint8_t bytes, uint8_t *buffer)
{
	return ops_smbus_bus(get_pbus_smbus(dev))->block_read(dev, cmd, bytes, buffer);
}
int smbus_block_write(device_t dev, uint8_t cmd, uint8_t bytes, const uint8_t *buffer)
{
	return ops_smbus_bus(get_pbus_smbus(dev))->block_write(dev, cmd, bytes, buffer);
}