wf_6690_sensor
struct wf_6690_sensor *max = i2c_get_clientdata(client);
#define wf_to_6690(x) container_of((x), struct wf_6690_sensor, sens)
struct wf_6690_sensor *max = wf_to_6690(sr);
struct wf_6690_sensor *max = wf_to_6690(sr);
struct wf_6690_sensor *max;
max = kzalloc_obj(struct wf_6690_sensor);