参照元†
- struct regmap *map
- unsigned int reg
- unsigned int *val
返り値†
static int _regmap_read(struct regmap *map, unsigned int reg,
unsigned int *val)
{
int ret;
void *context = _regmap_map_get_context(map);
if (!map->cache_bypass) {
ret = regcache_read(map, reg, val);
if (ret == 0)
return 0;
}
if (map->cache_only)
return -EBUSY;
if (!regmap_readable(map, reg))
return -EIO;
ret = map->reg_read(context, reg, val);
if (ret == 0) {
#ifdef LOG_DEVICE
if (map->dev && strcmp(dev_name(map->dev), LOG_DEVICE) == 0)
dev_info(map->dev, "%x => %x\n", reg, *val);
#endif
trace_regmap_reg_read(map, reg, *val);
if (!map->cache_bypass)
regcache_write(map, reg, *val);
}
return ret;
}
コメント†