1 // SPDX-License-Identifier: GPL-2.0-only
5  * AD5820 DAC driver for camera voice coil focus.
24 #include <media/v4l2-ctrls.h>
25 #include <media/v4l2-device.h>
26 #include <media/v4l2-subdev.h>
34 #define CODE_TO_RAMP_US(s)	((s) == 0 ? 0 : (1 << ((s) - 1)) * 50)
59 	struct i2c_client *client = v4l2_get_subdevdata(&coil->subdev);  in ad5820_write()
64 	if (!client->adapter)  in ad5820_write()
65 		return -ENODEV;  in ad5820_write()
68 	msg.addr  = client->addr;  in ad5820_write()
73 	r = i2c_transfer(client->adapter, &msg, 1);  in ad5820_write()
75 		dev_err(&client->dev, "write failed, error %d\n", r);  in ad5820_write()
91 	status = RAMP_US_TO_CODE(coil->focus_ramp_time);  in ad5820_update_hw()
92 	status |= coil->focus_ramp_mode  in ad5820_update_hw()
94 	status |= coil->focus_absolute << AD5820_DAC_SHIFT;  in ad5820_update_hw()
96 	if (coil->standby)  in ad5820_update_hw()
114 		coil->standby = true;  in ad5820_power_off()
118 	gpiod_set_value_cansleep(coil->enable_gpio, 0);  in ad5820_power_off()
120 	ret2 = regulator_disable(coil->vana);  in ad5820_power_off()
130 	ret = regulator_enable(coil->vana);  in ad5820_power_on()
134 	gpiod_set_value_cansleep(coil->enable_gpio, 1);  in ad5820_power_on()
138 		coil->standby = false;  in ad5820_power_on()
146 	gpiod_set_value_cansleep(coil->enable_gpio, 0);  in ad5820_power_on()
147 	coil->standby = true;  in ad5820_power_on()
148 	regulator_disable(coil->vana);  in ad5820_power_on()
159 		container_of(ctrl->handler, struct ad5820_device, ctrls);  in ad5820_set_ctrl()
161 	switch (ctrl->id) {  in ad5820_set_ctrl()
163 		coil->focus_absolute = ctrl->val;  in ad5820_set_ctrl()
177 	v4l2_ctrl_handler_init(&coil->ctrls, 1);  in ad5820_init_controls()
184 	 * for focus position, because it is meaningless for user. Meaningful  in ad5820_init_controls()
185 	 * would be to use focus distance or even its inverse, but since the  in ad5820_init_controls()
187 	 * will just use abstract codes here. In any case, smaller value = focus  in ad5820_init_controls()
188 	 * position farther from camera. The default zero value means focus at  in ad5820_init_controls()
191 	v4l2_ctrl_new_std(&coil->ctrls, &ad5820_ctrl_ops,  in ad5820_init_controls()
194 	if (coil->ctrls.error)  in ad5820_init_controls()
195 		return coil->ctrls.error;  in ad5820_init_controls()
197 	coil->focus_absolute = 0;  in ad5820_init_controls()
198 	coil->focus_ramp_time = 0;  in ad5820_init_controls()
199 	coil->focus_ramp_mode = 0;  in ad5820_init_controls()
201 	coil->subdev.ctrl_handler = &coil->ctrls;  in ad5820_init_controls()
222 	mutex_lock(&coil->power_lock);  in ad5820_set_power()
228 	if (coil->power_count == !on) {  in ad5820_set_power()
236 	coil->power_count += on ? 1 : -1;  in ad5820_set_power()
237 	WARN_ON(coil->power_count < 0);  in ad5820_set_power()
240 	mutex_unlock(&coil->power_lock);  in ad5820_set_power()
277 	if (!coil->power_count)  in ad5820_suspend()
289 	if (!coil->power_count)  in ad5820_resume()
301 	coil = devm_kzalloc(&client->dev, sizeof(*coil), GFP_KERNEL);  in ad5820_probe()
303 		return -ENOMEM;  in ad5820_probe()
305 	coil->vana = devm_regulator_get(&client->dev, "VANA");  in ad5820_probe()
306 	if (IS_ERR(coil->vana)) {  in ad5820_probe()
307 		ret = PTR_ERR(coil->vana);  in ad5820_probe()
308 		if (ret != -EPROBE_DEFER)  in ad5820_probe()
309 			dev_err(&client->dev, "could not get regulator for vana\n");  in ad5820_probe()
313 	coil->enable_gpio = devm_gpiod_get_optional(&client->dev, "enable",  in ad5820_probe()
315 	if (IS_ERR(coil->enable_gpio)) {  in ad5820_probe()
316 		ret = PTR_ERR(coil->enable_gpio);  in ad5820_probe()
317 		if (ret != -EPROBE_DEFER)  in ad5820_probe()
318 			dev_err(&client->dev, "could not get enable gpio\n");  in ad5820_probe()
322 	mutex_init(&coil->power_lock);  in ad5820_probe()
324 	v4l2_i2c_subdev_init(&coil->subdev, client, &ad5820_ops);  in ad5820_probe()
325 	coil->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;  in ad5820_probe()
326 	coil->subdev.internal_ops = &ad5820_internal_ops;  in ad5820_probe()
327 	coil->subdev.entity.function = MEDIA_ENT_F_LENS;  in ad5820_probe()
328 	strscpy(coil->subdev.name, "ad5820 focus", sizeof(coil->subdev.name));  in ad5820_probe()
330 	ret = media_entity_pads_init(&coil->subdev.entity, 0, NULL);  in ad5820_probe()
334 	ret = v4l2_async_register_subdev(&coil->subdev);  in ad5820_probe()
341 	media_entity_cleanup(&coil->subdev.entity);  in ad5820_probe()
343 	mutex_destroy(&coil->power_lock);  in ad5820_probe()
352 	v4l2_async_unregister_subdev(&coil->subdev);  in ad5820_remove()
353 	v4l2_ctrl_handler_free(&coil->ctrls);  in ad5820_remove()
354 	media_entity_cleanup(&coil->subdev.entity);  in ad5820_remove()
355 	mutex_destroy(&coil->power_lock);  in ad5820_remove()
389 MODULE_DESCRIPTION("AD5820 camera lens driver");