summaryrefslogtreecommitdiffstats
path: root/drivers/media/i2c/dw9714.c
blob: 206d74338b9c9d2ab236da6ef138b1507e8b675a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2015--2017 Intel Corporation.

#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/pm_runtime.h>
#include <linux/regulator/consumer.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-device.h>
#include <media/v4l2-event.h>

#define DW9714_NAME		"dw9714"
#define DW9714_MAX_FOCUS_POS	1023
/*
 * This sets the minimum granularity for the focus positions.
 * A value of 1 gives maximum accuracy for a desired focus position
 */
#define DW9714_FOCUS_STEPS	1
/*
 * This acts as the minimum granularity of lens movement.
 * Keep this value power of 2, so the control steps can be
 * uniformly adjusted for gradual lens movement, with desired
 * number of control steps.
 */
#define DW9714_CTRL_STEPS	16
#define DW9714_CTRL_DELAY_US	1000
/*
 * S[3:2] = 0x00, codes per step for "Linear Slope Control"
 * S[1:0] = 0x00, step period
 */
#define DW9714_DEFAULT_S 0x0
#define DW9714_VAL(data, s) ((data) << 4 | (s))

/* dw9714 device structure */
struct dw9714_device {
	struct v4l2_ctrl_handler ctrls_vcm;
	struct v4l2_subdev sd;
	u16 current_val;
	struct regulator *vcc;
};

static inline struct dw9714_device *to_dw9714_vcm(struct v4l2_ctrl *ctrl)
{
	return container_of(ctrl->handler, struct dw9714_device, ctrls_vcm);
}

static inline struct dw9714_device *sd_to_dw9714_vcm(struct v4l2_subdev *subdev)
{
	return container_of(subdev, struct dw9714_device, sd);
}

static int dw9714_i2c_write(struct i2c_client *client, u16 data)
{
	int ret;
	__be16 val = cpu_to_be16(data);

	ret = i2c_master_send(client, (const char *)&val, sizeof(val));
	if (ret != sizeof(val)) {
		dev_err(&client->dev, "I2C write fail\n");
		return -EIO;
	}
	return 0;
}

static int dw9714_t_focus_vcm(struct dw9714_device *dw9714_dev, u16 val)
{
	struct i2c_client *client = v4l2_get_subdevdata(&dw9714_dev->sd);

	dw9714_dev->current_val = val;

	return dw9714_i2c_write(client, DW9714_VAL(val, DW9714_DEFAULT_S));
}

static int dw9714_set_ctrl(struct v4l2_ctrl *ctrl)
{
	struct dw9714_device *dev_vcm = to_dw9714_vcm(ctrl);

	if (ctrl->id == V4L2_CID_FOCUS_ABSOLUTE)
		return dw9714_t_focus_vcm(dev_vcm, ctrl->val);

	return -EINVAL;
}

static const struct v4l2_ctrl_ops dw9714_vcm_ctrl_ops = {
	.s_ctrl = dw9714_set_ctrl,
};

static int dw9714_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
{
	return pm_runtime_resume_and_get(sd->dev);
}

static int dw9714_close(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
{
	pm_runtime_put(sd->dev);

	return 0;
}

static const struct v4l2_subdev_internal_ops dw9714_int_ops = {
	.open = dw9714_open,
	.close = dw9714_close,
};

static const struct v4l2_subdev_core_ops dw9714_core_ops = {
	.log_status = v4l2_ctrl_subdev_log_status,
	.subscribe_event = v4l2_ctrl_subdev_subscribe_event,
	.unsubscribe_event = v4l2_event_subdev_unsubscribe,
};

static const struct v4l2_subdev_ops dw9714_ops = {
	.core = &dw9714_core_ops,
};

static void dw9714_subdev_cleanup(struct dw9714_device *dw9714_dev)
{
	v4l2_async_unregister_subdev(&dw9714_dev->sd);
	v4l2_ctrl_handler_free(&dw9714_dev->ctrls_vcm);
	media_entity_cleanup(&dw9714_dev->sd.entity);
}

static int dw9714_init_controls(struct dw9714_device *dev_vcm)
{
	struct v4l2_ctrl_handler *hdl = &dev_vcm->ctrls_vcm;
	const struct v4l2_ctrl_ops *ops = &dw9714_vcm_ctrl_ops;

	v4l2_ctrl_handler_init(hdl, 1);

	v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FOCUS_ABSOLUTE,
			  0, DW9714_MAX_FOCUS_POS, DW9714_FOCUS_STEPS, 0);

	if (hdl->error)
		dev_err(dev_vcm->sd.dev, "%s fail error: 0x%x\n",
			__func__, hdl->error);
	dev_vcm->sd.ctrl_handler = hdl;
	return hdl->error;
}

static int dw9714_probe(struct i2c_client *client)
{
	struct dw9714_device *dw9714_dev;
	int rval;

	dw9714_dev = devm_kzalloc(&client->dev, sizeof(*dw9714_dev),
				  GFP_KERNEL);
	if (dw9714_dev == NULL)
		return -ENOMEM;

	dw9714_dev->vcc = devm_regulator_get(&client->dev, "vcc");
	if (IS_ERR(dw9714_dev->vcc))
		return PTR_ERR(dw9714_dev->vcc);

	rval = regulator_enable(dw9714_dev->vcc);
	if (rval < 0) {
		dev_err(&client->dev, "failed to enable vcc: %d\n", rval);
		return rval;
	}

	v4l2_i2c_subdev_init(&dw9714_dev->sd, client, &dw9714_ops);
	dw9714_dev->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE |
				V4L2_SUBDEV_FL_HAS_EVENTS;
	dw9714_dev->sd.internal_ops = &dw9714_int_ops;

	rval = dw9714_init_controls(dw9714_dev);
	if (rval)
		goto err_cleanup;

	rval = media_entity_pads_init(&dw9714_dev->sd.entity, 0, NULL);
	if (rval < 0)
		goto err_cleanup;

	dw9714_dev->sd.entity.function = MEDIA_ENT_F_LENS;

	rval = v4l2_async_register_subdev(&dw9714_dev->sd);
	if (rval < 0)
		goto err_cleanup;

	pm_runtime_set_active(&client->dev);
	pm_runtime_enable(&client->dev);
	pm_runtime_idle(&client->dev);

	return 0;

err_cleanup:
	regulator_disable(dw9714_dev->vcc);
	v4l2_ctrl_handler_free(&dw9714_dev->ctrls_vcm);
	media_entity_cleanup(&dw9714_dev->sd.entity);

	return rval;
}

static int dw9714_remove(struct i2c_client *client)
{
	struct v4l2_subdev *sd = i2c_get_clientdata(client);
	struct dw9714_device *dw9714_dev = sd_to_dw9714_vcm(sd);
	int ret;

	pm_runtime_disable(&client->dev);
	if (!pm_runtime_status_suspended(&client->dev)) {
		ret = regulator_disable(dw9714_dev->vcc);
		if (ret) {
			dev_err(&client->dev,
				"Failed to disable vcc: %d\n", ret);
		}
	}
	pm_runtime_set_suspended(&client->dev);
	dw9714_subdev_cleanup(dw9714_dev);

	return 0;
}

/*
 * This function sets the vcm position, so it consumes least current
 * The lens position is gradually moved in units of DW9714_CTRL_STEPS,
 * to make the movements smoothly.
 */
static int __maybe_unused dw9714_vcm_suspend(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct v4l2_subdev *sd = i2c_get_clientdata(client);
	struct dw9714_device *dw9714_dev = sd_to_dw9714_vcm(sd);
	int ret, val;

	if (pm_runtime_suspended(&client->dev))
		return 0;

	for (val = dw9714_dev->current_val & ~(DW9714_CTRL_STEPS - 1);
	     val >= 0; val -= DW9714_CTRL_STEPS) {
		ret = dw9714_i2c_write(client,
				       DW9714_VAL(val, DW9714_DEFAULT_S));
		if (ret)
			dev_err_once(dev, "%s I2C failure: %d", __func__, ret);
		usleep_range(DW9714_CTRL_DELAY_US, DW9714_CTRL_DELAY_US + 10);
	}

	ret = regulator_disable(dw9714_dev->vcc);
	if (ret)
		dev_err(dev, "Failed to disable vcc: %d\n", ret);

	return ret;
}

/*
 * This function sets the vcm position to the value set by the user
 * through v4l2_ctrl_ops s_ctrl handler
 * The lens position is gradually moved in units of DW9714_CTRL_STEPS,
 * to make the movements smoothly.
 */
static int  __maybe_unused dw9714_vcm_resume(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct v4l2_subdev *sd = i2c_get_clientdata(client);
	struct dw9714_device *dw9714_dev = sd_to_dw9714_vcm(sd);
	int ret, val;

	if (pm_runtime_suspended(&client->dev))
		return 0;

	ret = regulator_enable(dw9714_dev->vcc);
	if (ret) {
		dev_err(dev, "Failed to enable vcc: %d\n", ret);
		return ret;
	}
	usleep_range(1000, 2000);

	for (val = dw9714_dev->current_val % DW9714_CTRL_STEPS;
	     val < dw9714_dev->current_val + DW9714_CTRL_STEPS - 1;
	     val += DW9714_CTRL_STEPS) {
		ret = dw9714_i2c_write(client,
				       DW9714_VAL(val, DW9714_DEFAULT_S));
		if (ret)
			dev_err_ratelimited(dev, "%s I2C failure: %d",
						__func__, ret);
		usleep_range(DW9714_CTRL_DELAY_US, DW9714_CTRL_DELAY_US + 10);
	}

	return 0;
}

static const struct i2c_device_id dw9714_id_table[] = {
	{ DW9714_NAME, 0 },
	{ { 0 } }
};
MODULE_DEVICE_TABLE(i2c, dw9714_id_table);

static const struct of_device_id dw9714_of_table[] = {
	{ .compatible = "dongwoon,dw9714" },
	{ { 0 } }
};
MODULE_DEVICE_TABLE(of, dw9714_of_table);

static const struct dev_pm_ops dw9714_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(dw9714_vcm_suspend, dw9714_vcm_resume)
	SET_RUNTIME_PM_OPS(dw9714_vcm_suspend, dw9714_vcm_resume, NULL)
};

static struct i2c_driver dw9714_i2c_driver = {
	.driver = {
		.name = DW9714_NAME,
		.pm = &dw9714_pm_ops,
		.of_match_table = dw9714_of_table,
	},
	.probe_new = dw9714_probe,
	.remove = dw9714_remove,
	.id_table = dw9714_id_table,
};

module_i2c_driver(dw9714_i2c_driver);

MODULE_AUTHOR("Tianshu Qiu <tian.shu.qiu@intel.com>");
MODULE_AUTHOR("Jian Xu Zheng");
MODULE_AUTHOR("Yuning Pu <yuning.pu@intel.com>");
MODULE_AUTHOR("Jouni Ukkonen <jouni.ukkonen@intel.com>");
MODULE_AUTHOR("Tommi Franttila <tommi.franttila@intel.com>");
MODULE_DESCRIPTION("DW9714 VCM driver");
MODULE_LICENSE("GPL v2");