1
2
3
4#include <linux/acpi.h>
5#include <linux/delay.h>
6#include <linux/i2c.h>
7#include <linux/iopoll.h>
8#include <linux/module.h>
9#include <linux/pm_runtime.h>
10#include <media/v4l2-ctrls.h>
11#include <media/v4l2-device.h>
12
13#define DW9807_MAX_FOCUS_POS 1023
14
15
16
17
18#define DW9807_FOCUS_STEPS 1
19
20
21
22
23
24
25#define DW9807_CTRL_STEPS 16
26#define DW9807_CTRL_DELAY_US 1000
27
28#define DW9807_CTL_ADDR 0x02
29
30
31
32
33#define DW9807_MSB_ADDR 0x03
34#define DW9807_LSB_ADDR 0x04
35#define DW9807_STATUS_ADDR 0x05
36#define DW9807_MODE_ADDR 0x06
37#define DW9807_RESONANCE_ADDR 0x07
38
39#define MAX_RETRY 10
40
41struct dw9807_device {
42 struct v4l2_ctrl_handler ctrls_vcm;
43 struct v4l2_subdev sd;
44 u16 current_val;
45};
46
47static inline struct dw9807_device *sd_to_dw9807_vcm(
48 struct v4l2_subdev *subdev)
49{
50 return container_of(subdev, struct dw9807_device, sd);
51}
52
53static int dw9807_i2c_check(struct i2c_client *client)
54{
55 const char status_addr = DW9807_STATUS_ADDR;
56 char status_result;
57 int ret;
58
59 ret = i2c_master_send(client, &status_addr, sizeof(status_addr));
60 if (ret < 0) {
61 dev_err(&client->dev, "I2C write STATUS address fail ret = %d\n",
62 ret);
63 return ret;
64 }
65
66 ret = i2c_master_recv(client, &status_result, sizeof(status_result));
67 if (ret < 0) {
68 dev_err(&client->dev, "I2C read STATUS value fail ret = %d\n",
69 ret);
70 return ret;
71 }
72
73 return status_result;
74}
75
76static int dw9807_set_dac(struct i2c_client *client, u16 data)
77{
78 const char tx_data[3] = {
79 DW9807_MSB_ADDR, ((data >> 8) & 0x03), (data & 0xff)
80 };
81 int val, ret;
82
83
84
85
86
87
88 ret = readx_poll_timeout(dw9807_i2c_check, client, val, val <= 0,
89 DW9807_CTRL_DELAY_US, MAX_RETRY * DW9807_CTRL_DELAY_US);
90
91 if (ret || val < 0) {
92 if (ret) {
93 dev_warn(&client->dev,
94 "Cannot do the write operation because VCM is busy\n");
95 }
96
97 return ret ? -EBUSY : val;
98 }
99
100
101 ret = i2c_master_send(client, tx_data, sizeof(tx_data));
102 if (ret < 0) {
103 dev_err(&client->dev,
104 "I2C write MSB fail ret=%d\n", ret);
105
106 return ret;
107 }
108
109 return 0;
110}
111
112static int dw9807_set_ctrl(struct v4l2_ctrl *ctrl)
113{
114 struct dw9807_device *dev_vcm = container_of(ctrl->handler,
115 struct dw9807_device, ctrls_vcm);
116
117 if (ctrl->id == V4L2_CID_FOCUS_ABSOLUTE) {
118 struct i2c_client *client = v4l2_get_subdevdata(&dev_vcm->sd);
119
120 dev_vcm->current_val = ctrl->val;
121 return dw9807_set_dac(client, ctrl->val);
122 }
123
124 return -EINVAL;
125}
126
127static const struct v4l2_ctrl_ops dw9807_vcm_ctrl_ops = {
128 .s_ctrl = dw9807_set_ctrl,
129};
130
131static int dw9807_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
132{
133 int rval;
134
135 rval = pm_runtime_get_sync(sd->dev);
136 if (rval < 0) {
137 pm_runtime_put_noidle(sd->dev);
138 return rval;
139 }
140
141 return 0;
142}
143
144static int dw9807_close(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
145{
146 pm_runtime_put(sd->dev);
147
148 return 0;
149}
150
151static const struct v4l2_subdev_internal_ops dw9807_int_ops = {
152 .open = dw9807_open,
153 .close = dw9807_close,
154};
155
156static const struct v4l2_subdev_ops dw9807_ops = { };
157
158static void dw9807_subdev_cleanup(struct dw9807_device *dw9807_dev)
159{
160 v4l2_async_unregister_subdev(&dw9807_dev->sd);
161 v4l2_ctrl_handler_free(&dw9807_dev->ctrls_vcm);
162 media_entity_cleanup(&dw9807_dev->sd.entity);
163}
164
165static int dw9807_init_controls(struct dw9807_device *dev_vcm)
166{
167 struct v4l2_ctrl_handler *hdl = &dev_vcm->ctrls_vcm;
168 const struct v4l2_ctrl_ops *ops = &dw9807_vcm_ctrl_ops;
169 struct i2c_client *client = v4l2_get_subdevdata(&dev_vcm->sd);
170
171 v4l2_ctrl_handler_init(hdl, 1);
172
173 v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FOCUS_ABSOLUTE,
174 0, DW9807_MAX_FOCUS_POS, DW9807_FOCUS_STEPS, 0);
175
176 dev_vcm->sd.ctrl_handler = hdl;
177 if (hdl->error) {
178 dev_err(&client->dev, "%s fail error: 0x%x\n",
179 __func__, hdl->error);
180 return hdl->error;
181 }
182
183 return 0;
184}
185
186static int dw9807_probe(struct i2c_client *client)
187{
188 struct dw9807_device *dw9807_dev;
189 int rval;
190
191 dw9807_dev = devm_kzalloc(&client->dev, sizeof(*dw9807_dev),
192 GFP_KERNEL);
193 if (dw9807_dev == NULL)
194 return -ENOMEM;
195
196 v4l2_i2c_subdev_init(&dw9807_dev->sd, client, &dw9807_ops);
197 dw9807_dev->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
198 dw9807_dev->sd.internal_ops = &dw9807_int_ops;
199
200 rval = dw9807_init_controls(dw9807_dev);
201 if (rval)
202 goto err_cleanup;
203
204 rval = media_entity_pads_init(&dw9807_dev->sd.entity, 0, NULL);
205 if (rval < 0)
206 goto err_cleanup;
207
208 dw9807_dev->sd.entity.function = MEDIA_ENT_F_LENS;
209
210 rval = v4l2_async_register_subdev(&dw9807_dev->sd);
211 if (rval < 0)
212 goto err_cleanup;
213
214 pm_runtime_set_active(&client->dev);
215 pm_runtime_enable(&client->dev);
216 pm_runtime_idle(&client->dev);
217
218 return 0;
219
220err_cleanup:
221 v4l2_ctrl_handler_free(&dw9807_dev->ctrls_vcm);
222 media_entity_cleanup(&dw9807_dev->sd.entity);
223
224 return rval;
225}
226
227static int dw9807_remove(struct i2c_client *client)
228{
229 struct v4l2_subdev *sd = i2c_get_clientdata(client);
230 struct dw9807_device *dw9807_dev = sd_to_dw9807_vcm(sd);
231
232 pm_runtime_disable(&client->dev);
233
234 dw9807_subdev_cleanup(dw9807_dev);
235
236 return 0;
237}
238
239
240
241
242
243
244static int __maybe_unused dw9807_vcm_suspend(struct device *dev)
245{
246 struct i2c_client *client = to_i2c_client(dev);
247 struct v4l2_subdev *sd = i2c_get_clientdata(client);
248 struct dw9807_device *dw9807_dev = sd_to_dw9807_vcm(sd);
249 const char tx_data[2] = { DW9807_CTL_ADDR, 0x01 };
250 int ret, val;
251
252 for (val = dw9807_dev->current_val & ~(DW9807_CTRL_STEPS - 1);
253 val >= 0; val -= DW9807_CTRL_STEPS) {
254 ret = dw9807_set_dac(client, val);
255 if (ret)
256 dev_err_once(dev, "%s I2C failure: %d", __func__, ret);
257 usleep_range(DW9807_CTRL_DELAY_US, DW9807_CTRL_DELAY_US + 10);
258 }
259
260
261 ret = i2c_master_send(client, tx_data, sizeof(tx_data));
262 if (ret < 0) {
263 dev_err(&client->dev, "I2C write CTL fail ret = %d\n", ret);
264 return ret;
265 }
266
267 return 0;
268}
269
270
271
272
273
274
275
276static int __maybe_unused dw9807_vcm_resume(struct device *dev)
277{
278 struct i2c_client *client = to_i2c_client(dev);
279 struct v4l2_subdev *sd = i2c_get_clientdata(client);
280 struct dw9807_device *dw9807_dev = sd_to_dw9807_vcm(sd);
281 const char tx_data[2] = { DW9807_CTL_ADDR, 0x00 };
282 int ret, val;
283
284
285 ret = i2c_master_send(client, tx_data, sizeof(tx_data));
286 if (ret < 0) {
287 dev_err(&client->dev, "I2C write CTL fail ret = %d\n", ret);
288 return ret;
289 }
290
291 for (val = dw9807_dev->current_val % DW9807_CTRL_STEPS;
292 val < dw9807_dev->current_val + DW9807_CTRL_STEPS - 1;
293 val += DW9807_CTRL_STEPS) {
294 ret = dw9807_set_dac(client, val);
295 if (ret)
296 dev_err_ratelimited(dev, "%s I2C failure: %d",
297 __func__, ret);
298 usleep_range(DW9807_CTRL_DELAY_US, DW9807_CTRL_DELAY_US + 10);
299 }
300
301 return 0;
302}
303
304static const struct of_device_id dw9807_of_table[] = {
305 { .compatible = "dongwoon,dw9807-vcm" },
306 { }
307};
308MODULE_DEVICE_TABLE(of, dw9807_of_table);
309
310static const struct dev_pm_ops dw9807_pm_ops = {
311 SET_SYSTEM_SLEEP_PM_OPS(dw9807_vcm_suspend, dw9807_vcm_resume)
312 SET_RUNTIME_PM_OPS(dw9807_vcm_suspend, dw9807_vcm_resume, NULL)
313};
314
315static struct i2c_driver dw9807_i2c_driver = {
316 .driver = {
317 .name = "dw9807",
318 .pm = &dw9807_pm_ops,
319 .of_match_table = dw9807_of_table,
320 },
321 .probe_new = dw9807_probe,
322 .remove = dw9807_remove,
323};
324
325module_i2c_driver(dw9807_i2c_driver);
326
327MODULE_AUTHOR("Chiang, Alan <alanx.chiang@intel.com>");
328MODULE_DESCRIPTION("DW9807 VCM driver");
329MODULE_LICENSE("GPL v2");
330
