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cc95d342 RM |
1 | /* |
2 | * Copyright (c) 2015--2017 Intel Corporation. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License version | |
6 | * 2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | */ | |
13 | ||
14 | #include <linux/acpi.h> | |
15 | #include <linux/delay.h> | |
16 | #include <linux/i2c.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/pm_runtime.h> | |
19 | #include <media/v4l2-ctrls.h> | |
20 | #include <media/v4l2-device.h> | |
21 | ||
22 | #define DW9714_NAME "dw9714" | |
23 | #define DW9714_MAX_FOCUS_POS 1023 | |
24 | /* | |
25 | * This acts as the minimum granularity of lens movement. | |
26 | * Keep this value power of 2, so the control steps can be | |
27 | * uniformly adjusted for gradual lens movement, with desired | |
28 | * number of control steps. | |
29 | */ | |
30 | #define DW9714_CTRL_STEPS 16 | |
31 | #define DW9714_CTRL_DELAY_US 1000 | |
32 | /* | |
33 | * S[3:2] = 0x00, codes per step for "Linear Slope Control" | |
34 | * S[1:0] = 0x00, step period | |
35 | */ | |
36 | #define DW9714_DEFAULT_S 0x0 | |
37 | #define DW9714_VAL(data, s) ((data) << 4 | (s)) | |
38 | ||
39 | /* dw9714 device structure */ | |
40 | struct dw9714_device { | |
41 | struct i2c_client *client; | |
42 | struct v4l2_ctrl_handler ctrls_vcm; | |
43 | struct v4l2_subdev sd; | |
44 | u16 current_val; | |
45 | }; | |
46 | ||
47 | static inline struct dw9714_device *to_dw9714_vcm(struct v4l2_ctrl *ctrl) | |
48 | { | |
49 | return container_of(ctrl->handler, struct dw9714_device, ctrls_vcm); | |
50 | } | |
51 | ||
52 | static inline struct dw9714_device *sd_to_dw9714_vcm(struct v4l2_subdev *subdev) | |
53 | { | |
54 | return container_of(subdev, struct dw9714_device, sd); | |
55 | } | |
56 | ||
57 | static int dw9714_i2c_write(struct i2c_client *client, u16 data) | |
58 | { | |
59 | int ret; | |
60 | u16 val = cpu_to_be16(data); | |
61 | ||
62 | ret = i2c_master_send(client, (const char *)&val, sizeof(val)); | |
63 | if (ret != sizeof(val)) { | |
64 | dev_err(&client->dev, "I2C write fail\n"); | |
65 | return -EIO; | |
66 | } | |
67 | return 0; | |
68 | } | |
69 | ||
70 | static int dw9714_t_focus_vcm(struct dw9714_device *dw9714_dev, u16 val) | |
71 | { | |
72 | struct i2c_client *client = dw9714_dev->client; | |
73 | ||
74 | dw9714_dev->current_val = val; | |
75 | ||
76 | return dw9714_i2c_write(client, DW9714_VAL(val, DW9714_DEFAULT_S)); | |
77 | } | |
78 | ||
79 | static int dw9714_set_ctrl(struct v4l2_ctrl *ctrl) | |
80 | { | |
81 | struct dw9714_device *dev_vcm = to_dw9714_vcm(ctrl); | |
82 | ||
83 | if (ctrl->id == V4L2_CID_FOCUS_ABSOLUTE) | |
84 | return dw9714_t_focus_vcm(dev_vcm, ctrl->val); | |
85 | ||
86 | return -EINVAL; | |
87 | } | |
88 | ||
89 | static const struct v4l2_ctrl_ops dw9714_vcm_ctrl_ops = { | |
90 | .s_ctrl = dw9714_set_ctrl, | |
91 | }; | |
92 | ||
93 | static int dw9714_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh) | |
94 | { | |
95 | struct dw9714_device *dw9714_dev = sd_to_dw9714_vcm(sd); | |
96 | struct device *dev = &dw9714_dev->client->dev; | |
97 | int rval; | |
98 | ||
99 | rval = pm_runtime_get_sync(dev); | |
100 | if (rval < 0) { | |
101 | pm_runtime_put_noidle(dev); | |
102 | return rval; | |
103 | } | |
104 | ||
105 | return 0; | |
106 | } | |
107 | ||
108 | static int dw9714_close(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh) | |
109 | { | |
110 | struct dw9714_device *dw9714_dev = sd_to_dw9714_vcm(sd); | |
111 | struct device *dev = &dw9714_dev->client->dev; | |
112 | ||
113 | pm_runtime_put(dev); | |
114 | ||
115 | return 0; | |
116 | } | |
117 | ||
118 | static const struct v4l2_subdev_internal_ops dw9714_int_ops = { | |
119 | .open = dw9714_open, | |
120 | .close = dw9714_close, | |
121 | }; | |
122 | ||
123 | static const struct v4l2_subdev_ops dw9714_ops = { }; | |
124 | ||
125 | static void dw9714_subdev_cleanup(struct dw9714_device *dw9714_dev) | |
126 | { | |
127 | v4l2_async_unregister_subdev(&dw9714_dev->sd); | |
128 | v4l2_ctrl_handler_free(&dw9714_dev->ctrls_vcm); | |
129 | media_entity_cleanup(&dw9714_dev->sd.entity); | |
130 | } | |
131 | ||
132 | static int dw9714_init_controls(struct dw9714_device *dev_vcm) | |
133 | { | |
134 | struct v4l2_ctrl_handler *hdl = &dev_vcm->ctrls_vcm; | |
135 | const struct v4l2_ctrl_ops *ops = &dw9714_vcm_ctrl_ops; | |
136 | struct i2c_client *client = dev_vcm->client; | |
137 | ||
138 | v4l2_ctrl_handler_init(hdl, 1); | |
139 | ||
140 | v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FOCUS_ABSOLUTE, | |
141 | 0, DW9714_MAX_FOCUS_POS, DW9714_CTRL_STEPS, 0); | |
142 | ||
143 | if (hdl->error) | |
144 | dev_err(&client->dev, "%s fail error: 0x%x\n", | |
145 | __func__, hdl->error); | |
146 | dev_vcm->sd.ctrl_handler = hdl; | |
147 | return hdl->error; | |
148 | } | |
149 | ||
150 | static int dw9714_probe(struct i2c_client *client, | |
151 | const struct i2c_device_id *devid) | |
152 | { | |
153 | struct dw9714_device *dw9714_dev; | |
154 | int rval; | |
155 | ||
156 | dw9714_dev = devm_kzalloc(&client->dev, sizeof(*dw9714_dev), | |
157 | GFP_KERNEL); | |
158 | if (dw9714_dev == NULL) | |
159 | return -ENOMEM; | |
160 | ||
161 | dw9714_dev->client = client; | |
162 | ||
163 | v4l2_i2c_subdev_init(&dw9714_dev->sd, client, &dw9714_ops); | |
164 | dw9714_dev->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE; | |
165 | dw9714_dev->sd.internal_ops = &dw9714_int_ops; | |
166 | ||
167 | rval = dw9714_init_controls(dw9714_dev); | |
168 | if (rval) | |
169 | goto err_cleanup; | |
170 | ||
171 | rval = media_entity_pads_init(&dw9714_dev->sd.entity, 0, NULL); | |
172 | if (rval < 0) | |
173 | goto err_cleanup; | |
174 | ||
175 | dw9714_dev->sd.entity.function = MEDIA_ENT_F_LENS; | |
176 | ||
177 | rval = v4l2_async_register_subdev(&dw9714_dev->sd); | |
178 | if (rval < 0) | |
179 | goto err_cleanup; | |
180 | ||
181 | pm_runtime_set_active(&client->dev); | |
182 | pm_runtime_enable(&client->dev); | |
183 | ||
184 | return 0; | |
185 | ||
186 | err_cleanup: | |
187 | dw9714_subdev_cleanup(dw9714_dev); | |
188 | dev_err(&client->dev, "Probe failed: %d\n", rval); | |
189 | return rval; | |
190 | } | |
191 | ||
192 | static int dw9714_remove(struct i2c_client *client) | |
193 | { | |
194 | struct v4l2_subdev *sd = i2c_get_clientdata(client); | |
195 | struct dw9714_device *dw9714_dev = sd_to_dw9714_vcm(sd); | |
196 | ||
197 | pm_runtime_disable(&client->dev); | |
198 | dw9714_subdev_cleanup(dw9714_dev); | |
199 | ||
200 | return 0; | |
201 | } | |
202 | ||
203 | /* | |
204 | * This function sets the vcm position, so it consumes least current | |
205 | * The lens position is gradually moved in units of DW9714_CTRL_STEPS, | |
206 | * to make the movements smoothly. | |
207 | */ | |
208 | static int __maybe_unused dw9714_vcm_suspend(struct device *dev) | |
209 | { | |
210 | struct i2c_client *client = to_i2c_client(dev); | |
211 | struct v4l2_subdev *sd = i2c_get_clientdata(client); | |
212 | struct dw9714_device *dw9714_dev = sd_to_dw9714_vcm(sd); | |
213 | int ret, val; | |
214 | ||
215 | for (val = dw9714_dev->current_val & ~(DW9714_CTRL_STEPS - 1); | |
216 | val >= 0; val -= DW9714_CTRL_STEPS) { | |
217 | ret = dw9714_i2c_write(client, | |
218 | DW9714_VAL(val, DW9714_DEFAULT_S)); | |
219 | if (ret) | |
220 | dev_err_once(dev, "%s I2C failure: %d", __func__, ret); | |
221 | usleep_range(DW9714_CTRL_DELAY_US, DW9714_CTRL_DELAY_US + 10); | |
222 | } | |
223 | return 0; | |
224 | } | |
225 | ||
226 | /* | |
227 | * This function sets the vcm position to the value set by the user | |
228 | * through v4l2_ctrl_ops s_ctrl handler | |
229 | * The lens position is gradually moved in units of DW9714_CTRL_STEPS, | |
230 | * to make the movements smoothly. | |
231 | */ | |
232 | static int __maybe_unused dw9714_vcm_resume(struct device *dev) | |
233 | { | |
234 | struct i2c_client *client = to_i2c_client(dev); | |
235 | struct v4l2_subdev *sd = i2c_get_clientdata(client); | |
236 | struct dw9714_device *dw9714_dev = sd_to_dw9714_vcm(sd); | |
237 | int ret, val; | |
238 | ||
239 | for (val = dw9714_dev->current_val % DW9714_CTRL_STEPS; | |
240 | val < dw9714_dev->current_val + DW9714_CTRL_STEPS - 1; | |
241 | val += DW9714_CTRL_STEPS) { | |
242 | ret = dw9714_i2c_write(client, | |
243 | DW9714_VAL(val, DW9714_DEFAULT_S)); | |
244 | if (ret) | |
245 | dev_err_ratelimited(dev, "%s I2C failure: %d", | |
246 | __func__, ret); | |
247 | usleep_range(DW9714_CTRL_DELAY_US, DW9714_CTRL_DELAY_US + 10); | |
248 | } | |
249 | ||
250 | return 0; | |
251 | } | |
252 | ||
253 | #ifdef CONFIG_ACPI | |
254 | static const struct acpi_device_id dw9714_acpi_match[] = { | |
255 | {}, | |
256 | }; | |
257 | MODULE_DEVICE_TABLE(acpi, dw9714_acpi_match); | |
258 | #endif | |
259 | ||
260 | static const struct i2c_device_id dw9714_id_table[] = { | |
261 | {DW9714_NAME, 0}, | |
262 | {} | |
263 | }; | |
264 | ||
265 | MODULE_DEVICE_TABLE(i2c, dw9714_id_table); | |
266 | ||
267 | static const struct dev_pm_ops dw9714_pm_ops = { | |
268 | SET_SYSTEM_SLEEP_PM_OPS(dw9714_vcm_suspend, dw9714_vcm_resume) | |
269 | SET_RUNTIME_PM_OPS(dw9714_vcm_suspend, dw9714_vcm_resume, NULL) | |
270 | }; | |
271 | ||
272 | static struct i2c_driver dw9714_i2c_driver = { | |
273 | .driver = { | |
274 | .name = DW9714_NAME, | |
275 | .pm = &dw9714_pm_ops, | |
276 | .acpi_match_table = ACPI_PTR(dw9714_acpi_match), | |
277 | }, | |
278 | .probe = dw9714_probe, | |
279 | .remove = dw9714_remove, | |
280 | .id_table = dw9714_id_table, | |
281 | }; | |
282 | ||
283 | module_i2c_driver(dw9714_i2c_driver); | |
284 | ||
285 | MODULE_AUTHOR("Tianshu Qiu <tian.shu.qiu@intel.com>"); | |
286 | MODULE_AUTHOR("Jian Xu Zheng <jian.xu.zheng@intel.com>"); | |
287 | MODULE_AUTHOR("Yuning Pu <yuning.pu@intel.com>"); | |
288 | MODULE_AUTHOR("Jouni Ukkonen <jouni.ukkonen@intel.com>"); | |
289 | MODULE_AUTHOR("Tommi Franttila <tommi.franttila@intel.com>"); | |
290 | MODULE_DESCRIPTION("DW9714 VCM driver"); | |
291 | MODULE_LICENSE("GPL v2"); |