4  * AD5820 DAC driver for camera voice coil focus.
64 static int ad5820_write(struct ad5820_device *coil, u16 data)  in ad5820_write()  argument
66 	struct i2c_client *client = v4l2_get_subdevdata(&coil->subdev);  in ad5820_write()
94 static int ad5820_update_hw(struct ad5820_device *coil)  in ad5820_update_hw()  argument
98 	status = RAMP_US_TO_CODE(coil->focus_ramp_time);  in ad5820_update_hw()
99 	status |= coil->focus_ramp_mode  in ad5820_update_hw()
101 	status |= coil->focus_absolute << AD5820_DAC_SHIFT;  in ad5820_update_hw()
103 	if (coil->standby)  in ad5820_update_hw()
106 	return ad5820_write(coil, status);  in ad5820_update_hw()
112 static int ad5820_power_off(struct ad5820_device *coil, bool standby)  in ad5820_power_off()  argument
118 	 * (single power line control for both coil and sensor).  in ad5820_power_off()
121 		coil->standby = true;  in ad5820_power_off()
122 		ret = ad5820_update_hw(coil);  in ad5820_power_off()
125 	ret2 = regulator_disable(coil->vana);  in ad5820_power_off()
131 static int ad5820_power_on(struct ad5820_device *coil, bool restore)  in ad5820_power_on()  argument
135 	ret = regulator_enable(coil->vana);  in ad5820_power_on()
141 		coil->standby = false;  in ad5820_power_on()
142 		ret = ad5820_update_hw(coil);  in ad5820_power_on()
149 	coil->standby = true;  in ad5820_power_on()
150 	regulator_disable(coil->vana);  in ad5820_power_on()
160 	struct ad5820_device *coil =  in ad5820_set_ctrl()  local
165 		coil->focus_absolute = ctrl->val;  in ad5820_set_ctrl()
166 		return ad5820_update_hw(coil);  in ad5820_set_ctrl()
177 static int ad5820_init_controls(struct ad5820_device *coil)  in ad5820_init_controls()  argument
179 	v4l2_ctrl_handler_init(&coil->ctrls, 1);  in ad5820_init_controls()
193 	v4l2_ctrl_new_std(&coil->ctrls, &ad5820_ctrl_ops,  in ad5820_init_controls()
196 	if (coil->ctrls.error)  in ad5820_init_controls()
197 		return coil->ctrls.error;  in ad5820_init_controls()
199 	coil->focus_absolute = 0;  in ad5820_init_controls()
200 	coil->focus_ramp_time = 0;  in ad5820_init_controls()
201 	coil->focus_ramp_mode = 0;  in ad5820_init_controls()
203 	coil->subdev.ctrl_handler = &coil->ctrls;  in ad5820_init_controls()
213 	struct ad5820_device *coil = to_ad5820_device(subdev);  in ad5820_registered()  local
215 	return ad5820_init_controls(coil);  in ad5820_registered()
221 	struct ad5820_device *coil = to_ad5820_device(subdev);  in ad5820_set_power()  local
224 	mutex_lock(&coil->power_lock);  in ad5820_set_power()
230 	if (coil->power_count == !on) {  in ad5820_set_power()
231 		ret = on ? ad5820_power_on(coil, true) :  in ad5820_set_power()
232 			ad5820_power_off(coil, true);  in ad5820_set_power()
238 	coil->power_count += on ? 1 : -1;  in ad5820_set_power()
239 	WARN_ON(coil->power_count < 0);  in ad5820_set_power()
242 	mutex_unlock(&coil->power_lock);  in ad5820_set_power()
277 	struct ad5820_device *coil = to_ad5820_device(subdev);  in ad5820_suspend()  local
279 	if (!coil->power_count)  in ad5820_suspend()
282 	return ad5820_power_off(coil, false);  in ad5820_suspend()
289 	struct ad5820_device *coil = to_ad5820_device(subdev);  in ad5820_resume()  local
291 	if (!coil->power_count)  in ad5820_resume()
294 	return ad5820_power_on(coil, true);  in ad5820_resume()
300 	struct ad5820_device *coil;  in ad5820_probe()  local
303 	coil = devm_kzalloc(&client->dev, sizeof(*coil), GFP_KERNEL);  in ad5820_probe()
304 	if (!coil)  in ad5820_probe()
307 	coil->vana = devm_regulator_get(&client->dev, "VANA");  in ad5820_probe()
308 	if (IS_ERR(coil->vana)) {  in ad5820_probe()
309 		ret = PTR_ERR(coil->vana);  in ad5820_probe()
315 	mutex_init(&coil->power_lock);  in ad5820_probe()
317 	v4l2_i2c_subdev_init(&coil->subdev, client, &ad5820_ops);  in ad5820_probe()
318 	coil->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;  in ad5820_probe()
319 	coil->subdev.internal_ops = &ad5820_internal_ops;  in ad5820_probe()
320 	strcpy(coil->subdev.name, "ad5820 focus");  in ad5820_probe()
322 	ret = media_entity_pads_init(&coil->subdev.entity, 0, NULL);  in ad5820_probe()
326 	ret = v4l2_async_register_subdev(&coil->subdev);  in ad5820_probe()
333 	mutex_destroy(&coil->power_lock);  in ad5820_probe()
335 	media_entity_cleanup(&coil->subdev.entity);  in ad5820_probe()
342 	struct ad5820_device *coil = to_ad5820_device(subdev);  in ad5820_remove()  local
344 	v4l2_async_unregister_subdev(&coil->subdev);  in ad5820_remove()
345 	v4l2_ctrl_handler_free(&coil->ctrls);  in ad5820_remove()
346 	media_entity_cleanup(&coil->subdev.entity);  in ad5820_remove()
347 	mutex_destroy(&coil->power_lock);  in ad5820_remove()