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17#include <linux/errno.h>
18#include <linux/i2c.h>
19#include <linux/kernel.h>
20#include <linux/module.h>
21#include <linux/regulator/consumer.h>
22#include <linux/gpio/consumer.h>
23
24#include <media/v4l2-ctrls.h>
25#include <media/v4l2-device.h>
26#include <media/v4l2-subdev.h>
27
28
29#define AD5820_POWER_DOWN (1 << 15)
30#define AD5820_DAC_SHIFT 4
31#define AD5820_RAMP_MODE_LINEAR (0 << 3)
32#define AD5820_RAMP_MODE_64_16 (1 << 3)
33
34#define CODE_TO_RAMP_US(s) ((s) == 0 ? 0 : (1 << ((s) - 1)) * 50)
35#define RAMP_US_TO_CODE(c) fls(((c) + ((c)>>1)) / 50)
36
37#define to_ad5820_device(sd) container_of(sd, struct ad5820_device, subdev)
38
39struct ad5820_device {
40 struct v4l2_subdev subdev;
41 struct ad5820_platform_data *platform_data;
42 struct regulator *vana;
43
44 struct v4l2_ctrl_handler ctrls;
45 u32 focus_absolute;
46 u32 focus_ramp_time;
47 u32 focus_ramp_mode;
48
49 struct gpio_desc *enable_gpio;
50
51 struct mutex power_lock;
52 int power_count;
53
54 bool standby;
55};
56
57static int ad5820_write(struct ad5820_device *coil, u16 data)
58{
59 struct i2c_client *client = v4l2_get_subdevdata(&coil->subdev);
60 struct i2c_msg msg;
61 __be16 be_data;
62 int r;
63
64 if (!client->adapter)
65 return -ENODEV;
66
67 be_data = cpu_to_be16(data);
68 msg.addr = client->addr;
69 msg.flags = 0;
70 msg.len = 2;
71 msg.buf = (u8 *)&be_data;
72
73 r = i2c_transfer(client->adapter, &msg, 1);
74 if (r < 0) {
75 dev_err(&client->dev, "write failed, error %d\n", r);
76 return r;
77 }
78
79 return 0;
80}
81
82
83
84
85
86
87static int ad5820_update_hw(struct ad5820_device *coil)
88{
89 u16 status;
90
91 status = RAMP_US_TO_CODE(coil->focus_ramp_time);
92 status |= coil->focus_ramp_mode
93 ? AD5820_RAMP_MODE_64_16 : AD5820_RAMP_MODE_LINEAR;
94 status |= coil->focus_absolute << AD5820_DAC_SHIFT;
95
96 if (coil->standby)
97 status |= AD5820_POWER_DOWN;
98
99 return ad5820_write(coil, status);
100}
101
102
103
104
105static int ad5820_power_off(struct ad5820_device *coil, bool standby)
106{
107 int ret = 0, ret2;
108
109
110
111
112
113 if (standby) {
114 coil->standby = true;
115 ret = ad5820_update_hw(coil);
116 }
117
118 gpiod_set_value_cansleep(coil->enable_gpio, 0);
119
120 ret2 = regulator_disable(coil->vana);
121 if (ret)
122 return ret;
123 return ret2;
124}
125
126static int ad5820_power_on(struct ad5820_device *coil, bool restore)
127{
128 int ret;
129
130 ret = regulator_enable(coil->vana);
131 if (ret < 0)
132 return ret;
133
134 gpiod_set_value_cansleep(coil->enable_gpio, 1);
135
136 if (restore) {
137
138 coil->standby = false;
139 ret = ad5820_update_hw(coil);
140 if (ret)
141 goto fail;
142 }
143 return 0;
144
145fail:
146 gpiod_set_value_cansleep(coil->enable_gpio, 0);
147 coil->standby = true;
148 regulator_disable(coil->vana);
149
150 return ret;
151}
152
153
154
155
156static int ad5820_set_ctrl(struct v4l2_ctrl *ctrl)
157{
158 struct ad5820_device *coil =
159 container_of(ctrl->handler, struct ad5820_device, ctrls);
160
161 switch (ctrl->id) {
162 case V4L2_CID_FOCUS_ABSOLUTE:
163 coil->focus_absolute = ctrl->val;
164 return ad5820_update_hw(coil);
165 }
166
167 return 0;
168}
169
170static const struct v4l2_ctrl_ops ad5820_ctrl_ops = {
171 .s_ctrl = ad5820_set_ctrl,
172};
173
174
175static int ad5820_init_controls(struct ad5820_device *coil)
176{
177 v4l2_ctrl_handler_init(&coil->ctrls, 1);
178
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183
184
185
186
187
188
189
190
191 v4l2_ctrl_new_std(&coil->ctrls, &ad5820_ctrl_ops,
192 V4L2_CID_FOCUS_ABSOLUTE, 0, 1023, 1, 0);
193
194 if (coil->ctrls.error)
195 return coil->ctrls.error;
196
197 coil->focus_absolute = 0;
198 coil->focus_ramp_time = 0;
199 coil->focus_ramp_mode = 0;
200
201 coil->subdev.ctrl_handler = &coil->ctrls;
202
203 return 0;
204}
205
206
207
208
209static int ad5820_registered(struct v4l2_subdev *subdev)
210{
211 struct ad5820_device *coil = to_ad5820_device(subdev);
212
213 return ad5820_init_controls(coil);
214}
215
216static int
217ad5820_set_power(struct v4l2_subdev *subdev, int on)
218{
219 struct ad5820_device *coil = to_ad5820_device(subdev);
220 int ret = 0;
221
222 mutex_lock(&coil->power_lock);
223
224
225
226
227
228 if (coil->power_count == !on) {
229 ret = on ? ad5820_power_on(coil, true) :
230 ad5820_power_off(coil, true);
231 if (ret < 0)
232 goto done;
233 }
234
235
236 coil->power_count += on ? 1 : -1;
237 WARN_ON(coil->power_count < 0);
238
239done:
240 mutex_unlock(&coil->power_lock);
241 return ret;
242}
243
244static int ad5820_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
245{
246 return ad5820_set_power(sd, 1);
247}
248
249static int ad5820_close(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
250{
251 return ad5820_set_power(sd, 0);
252}
253
254static const struct v4l2_subdev_core_ops ad5820_core_ops = {
255 .s_power = ad5820_set_power,
256};
257
258static const struct v4l2_subdev_ops ad5820_ops = {
259 .core = &ad5820_core_ops,
260};
261
262static const struct v4l2_subdev_internal_ops ad5820_internal_ops = {
263 .registered = ad5820_registered,
264 .open = ad5820_open,
265 .close = ad5820_close,
266};
267
268
269
270
271static int __maybe_unused ad5820_suspend(struct device *dev)
272{
273 struct v4l2_subdev *subdev = dev_get_drvdata(dev);
274 struct ad5820_device *coil = to_ad5820_device(subdev);
275
276 if (!coil->power_count)
277 return 0;
278
279 return ad5820_power_off(coil, false);
280}
281
282static int __maybe_unused ad5820_resume(struct device *dev)
283{
284 struct v4l2_subdev *subdev = dev_get_drvdata(dev);
285 struct ad5820_device *coil = to_ad5820_device(subdev);
286
287 if (!coil->power_count)
288 return 0;
289
290 return ad5820_power_on(coil, true);
291}
292
293static int ad5820_probe(struct i2c_client *client,
294 const struct i2c_device_id *devid)
295{
296 struct ad5820_device *coil;
297 int ret;
298
299 coil = devm_kzalloc(&client->dev, sizeof(*coil), GFP_KERNEL);
300 if (!coil)
301 return -ENOMEM;
302
303 coil->vana = devm_regulator_get(&client->dev, "VANA");
304 if (IS_ERR(coil->vana)) {
305 ret = PTR_ERR(coil->vana);
306 if (ret != -EPROBE_DEFER)
307 dev_err(&client->dev, "could not get regulator for vana\n");
308 return ret;
309 }
310
311 coil->enable_gpio = devm_gpiod_get_optional(&client->dev, "enable",
312 GPIOD_OUT_LOW);
313 if (IS_ERR(coil->enable_gpio)) {
314 ret = PTR_ERR(coil->enable_gpio);
315 if (ret != -EPROBE_DEFER)
316 dev_err(&client->dev, "could not get enable gpio\n");
317 return ret;
318 }
319
320 mutex_init(&coil->power_lock);
321
322 v4l2_i2c_subdev_init(&coil->subdev, client, &ad5820_ops);
323 coil->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
324 coil->subdev.internal_ops = &ad5820_internal_ops;
325 coil->subdev.entity.function = MEDIA_ENT_F_LENS;
326 strscpy(coil->subdev.name, "ad5820 focus", sizeof(coil->subdev.name));
327
328 ret = media_entity_pads_init(&coil->subdev.entity, 0, NULL);
329 if (ret < 0)
330 goto cleanup2;
331
332 ret = v4l2_async_register_subdev(&coil->subdev);
333 if (ret < 0)
334 goto cleanup;
335
336 return ret;
337
338cleanup2:
339 mutex_destroy(&coil->power_lock);
340cleanup:
341 media_entity_cleanup(&coil->subdev.entity);
342 return ret;
343}
344
345static int ad5820_remove(struct i2c_client *client)
346{
347 struct v4l2_subdev *subdev = i2c_get_clientdata(client);
348 struct ad5820_device *coil = to_ad5820_device(subdev);
349
350 v4l2_async_unregister_subdev(&coil->subdev);
351 v4l2_ctrl_handler_free(&coil->ctrls);
352 media_entity_cleanup(&coil->subdev.entity);
353 mutex_destroy(&coil->power_lock);
354 return 0;
355}
356
357static const struct i2c_device_id ad5820_id_table[] = {
358 { "ad5820", 0 },
359 { "ad5821", 0 },
360 { "ad5823", 0 },
361 { }
362};
363MODULE_DEVICE_TABLE(i2c, ad5820_id_table);
364
365static const struct of_device_id ad5820_of_table[] = {
366 { .compatible = "adi,ad5820" },
367 { .compatible = "adi,ad5821" },
368 { .compatible = "adi,ad5823" },
369 { }
370};
371MODULE_DEVICE_TABLE(of, ad5820_of_table);
372
373static SIMPLE_DEV_PM_OPS(ad5820_pm, ad5820_suspend, ad5820_resume);
374
375static struct i2c_driver ad5820_i2c_driver = {
376 .driver = {
377 .name = "ad5820",
378 .pm = &ad5820_pm,
379 .of_match_table = ad5820_of_table,
380 },
381 .probe = ad5820_probe,
382 .remove = ad5820_remove,
383 .id_table = ad5820_id_table,
384};
385
386module_i2c_driver(ad5820_i2c_driver);
387
388MODULE_AUTHOR("Tuukka Toivonen");
389MODULE_DESCRIPTION("AD5820 camera lens driver");
390MODULE_LICENSE("GPL");
391