1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (c) 2020 MediaTek Inc.
3
4 #include <linux/delay.h>
5 #include <linux/i2c.h>
6 #include <linux/module.h>
7 #include <linux/pm_runtime.h>
8 #include <linux/regulator/consumer.h>
9 #include <media/v4l2-async.h>
10 #include <media/v4l2-ctrls.h>
11 #include <media/v4l2-device.h>
12 #include <media/v4l2-fwnode.h>
13 #include <media/v4l2-subdev.h>
14
15 #define DW9768_NAME "dw9768"
16 #define DW9768_MAX_FOCUS_POS (1024 - 1)
17 /*
18 * This sets the minimum granularity for the focus positions.
19 * A value of 1 gives maximum accuracy for a desired focus position
20 */
21 #define DW9768_FOCUS_STEPS 1
22
23 /*
24 * Ring control and Power control register
25 * Bit[1] RING_EN
26 * 0: Direct mode
27 * 1: AAC mode (ringing control mode)
28 * Bit[0] PD
29 * 0: Normal operation mode
30 * 1: Power down mode
31 * DW9768 requires waiting time of Topr after PD reset takes place.
32 */
33 #define DW9768_RING_PD_CONTROL_REG 0x02
34 #define DW9768_PD_MODE_OFF 0x00
35 #define DW9768_PD_MODE_EN BIT(0)
36 #define DW9768_AAC_MODE_EN BIT(1)
37
38 /*
39 * DW9768 separates two registers to control the VCM position.
40 * One for MSB value, another is LSB value.
41 * DAC_MSB: D[9:8] (ADD: 0x03)
42 * DAC_LSB: D[7:0] (ADD: 0x04)
43 * D[9:0] DAC data input: positive output current = D[9:0] / 1023 * 100[mA]
44 */
45 #define DW9768_MSB_ADDR 0x03
46 #define DW9768_LSB_ADDR 0x04
47 #define DW9768_STATUS_ADDR 0x05
48
49 /*
50 * AAC mode control & prescale register
51 * Bit[7:5] Namely AC[2:0], decide the VCM mode and operation time.
52 * 001 AAC2 0.48 x Tvib
53 * 010 AAC3 0.70 x Tvib
54 * 011 AAC4 0.75 x Tvib
55 * 101 AAC8 1.13 x Tvib
56 * Bit[2:0] Namely PRESC[2:0], set the internal clock dividing rate as follow.
57 * 000 2
58 * 001 1
59 * 010 1/2
60 * 011 1/4
61 * 100 8
62 * 101 4
63 */
64 #define DW9768_AAC_PRESC_REG 0x06
65 #define DW9768_AAC_MODE_SEL_MASK GENMASK(7, 5)
66 #define DW9768_CLOCK_PRE_SCALE_SEL_MASK GENMASK(2, 0)
67
68 /*
69 * VCM period of vibration register
70 * Bit[5:0] Defined as VCM rising periodic time (Tvib) together with PRESC[2:0]
71 * Tvib = (6.3ms + AACT[5:0] * 0.1ms) * Dividing Rate
72 * Dividing Rate is the internal clock dividing rate that is defined at
73 * PRESCALE register (ADD: 0x06)
74 */
75 #define DW9768_AAC_TIME_REG 0x07
76
77 /*
78 * DW9768 requires waiting time (delay time) of t_OPR after power-up,
79 * or in the case of PD reset taking place.
80 */
81 #define DW9768_T_OPR_US 1000
82 #define DW9768_TVIB_MS_BASE10 (64 - 1)
83 #define DW9768_AAC_MODE_DEFAULT 2
84 #define DW9768_AAC_TIME_DEFAULT 0x20
85 #define DW9768_CLOCK_PRE_SCALE_DEFAULT 1
86
87 /*
88 * This acts as the minimum granularity of lens movement.
89 * Keep this value power of 2, so the control steps can be
90 * uniformly adjusted for gradual lens movement, with desired
91 * number of control steps.
92 */
93 #define DW9768_MOVE_STEPS 16
94
95 static const char * const dw9768_supply_names[] = {
96 "vin", /* Digital I/O power */
97 "vdd", /* Digital core power */
98 };
99
100 /* dw9768 device structure */
101 struct dw9768 {
102 struct regulator_bulk_data supplies[ARRAY_SIZE(dw9768_supply_names)];
103 struct v4l2_ctrl_handler ctrls;
104 struct v4l2_ctrl *focus;
105 struct v4l2_subdev sd;
106
107 u32 aac_mode;
108 u32 aac_timing;
109 u32 clock_presc;
110 u32 move_delay_us;
111 };
112
sd_to_dw9768(struct v4l2_subdev * subdev)113 static inline struct dw9768 *sd_to_dw9768(struct v4l2_subdev *subdev)
114 {
115 return container_of(subdev, struct dw9768, sd);
116 }
117
118 struct regval_list {
119 u8 reg_num;
120 u8 value;
121 };
122
123 struct dw9768_aac_mode_ot_multi {
124 u32 aac_mode_enum;
125 u32 ot_multi_base100;
126 };
127
128 struct dw9768_clk_presc_dividing_rate {
129 u32 clk_presc_enum;
130 u32 dividing_rate_base100;
131 };
132
133 static const struct dw9768_aac_mode_ot_multi aac_mode_ot_multi[] = {
134 {1, 48},
135 {2, 70},
136 {3, 75},
137 {5, 113},
138 };
139
140 static const struct dw9768_clk_presc_dividing_rate presc_dividing_rate[] = {
141 {0, 200},
142 {1, 100},
143 {2, 50},
144 {3, 25},
145 {4, 800},
146 {5, 400},
147 };
148
dw9768_find_ot_multi(u32 aac_mode_param)149 static u32 dw9768_find_ot_multi(u32 aac_mode_param)
150 {
151 u32 cur_ot_multi_base100 = 70;
152 unsigned int i;
153
154 for (i = 0; i < ARRAY_SIZE(aac_mode_ot_multi); i++) {
155 if (aac_mode_ot_multi[i].aac_mode_enum == aac_mode_param) {
156 cur_ot_multi_base100 =
157 aac_mode_ot_multi[i].ot_multi_base100;
158 }
159 }
160
161 return cur_ot_multi_base100;
162 }
163
dw9768_find_dividing_rate(u32 presc_param)164 static u32 dw9768_find_dividing_rate(u32 presc_param)
165 {
166 u32 cur_clk_dividing_rate_base100 = 100;
167 unsigned int i;
168
169 for (i = 0; i < ARRAY_SIZE(presc_dividing_rate); i++) {
170 if (presc_dividing_rate[i].clk_presc_enum == presc_param) {
171 cur_clk_dividing_rate_base100 =
172 presc_dividing_rate[i].dividing_rate_base100;
173 }
174 }
175
176 return cur_clk_dividing_rate_base100;
177 }
178
179 /*
180 * DW9768_AAC_PRESC_REG & DW9768_AAC_TIME_REG determine VCM operation time.
181 * For current VCM mode: AAC3, Operation Time would be 0.70 x Tvib.
182 * Tvib = (6.3ms + AACT[5:0] * 0.1MS) * Dividing Rate.
183 * Below is calculation of the operation delay for each step.
184 */
dw9768_cal_move_delay(u32 aac_mode_param,u32 presc_param,u32 aac_timing_param)185 static inline u32 dw9768_cal_move_delay(u32 aac_mode_param, u32 presc_param,
186 u32 aac_timing_param)
187 {
188 u32 Tvib_us;
189 u32 ot_multi_base100;
190 u32 clk_dividing_rate_base100;
191
192 ot_multi_base100 = dw9768_find_ot_multi(aac_mode_param);
193
194 clk_dividing_rate_base100 = dw9768_find_dividing_rate(presc_param);
195
196 Tvib_us = (DW9768_TVIB_MS_BASE10 + aac_timing_param) *
197 clk_dividing_rate_base100;
198
199 return Tvib_us * ot_multi_base100 / 100;
200 }
201
dw9768_mod_reg(struct dw9768 * dw9768,u8 reg,u8 mask,u8 val)202 static int dw9768_mod_reg(struct dw9768 *dw9768, u8 reg, u8 mask, u8 val)
203 {
204 struct i2c_client *client = v4l2_get_subdevdata(&dw9768->sd);
205 int ret;
206
207 ret = i2c_smbus_read_byte_data(client, reg);
208 if (ret < 0)
209 return ret;
210
211 val = ((unsigned char)ret & ~mask) | (val & mask);
212
213 return i2c_smbus_write_byte_data(client, reg, val);
214 }
215
dw9768_set_dac(struct dw9768 * dw9768,u16 val)216 static int dw9768_set_dac(struct dw9768 *dw9768, u16 val)
217 {
218 struct i2c_client *client = v4l2_get_subdevdata(&dw9768->sd);
219
220 /* Write VCM position to registers */
221 return i2c_smbus_write_word_swapped(client, DW9768_MSB_ADDR, val);
222 }
223
dw9768_init(struct dw9768 * dw9768)224 static int dw9768_init(struct dw9768 *dw9768)
225 {
226 struct i2c_client *client = v4l2_get_subdevdata(&dw9768->sd);
227 int ret, val;
228
229 /* Reset DW9768_RING_PD_CONTROL_REG to default status 0x00 */
230 ret = i2c_smbus_write_byte_data(client, DW9768_RING_PD_CONTROL_REG,
231 DW9768_PD_MODE_OFF);
232 if (ret < 0)
233 return ret;
234
235 /*
236 * DW9769 requires waiting delay time of t_OPR
237 * after PD reset takes place.
238 */
239 usleep_range(DW9768_T_OPR_US, DW9768_T_OPR_US + 100);
240
241 /* Set DW9768_RING_PD_CONTROL_REG to DW9768_AAC_MODE_EN(0x01) */
242 ret = i2c_smbus_write_byte_data(client, DW9768_RING_PD_CONTROL_REG,
243 DW9768_AAC_MODE_EN);
244 if (ret < 0)
245 return ret;
246
247 /* Set AAC mode */
248 ret = dw9768_mod_reg(dw9768, DW9768_AAC_PRESC_REG,
249 DW9768_AAC_MODE_SEL_MASK,
250 dw9768->aac_mode << 5);
251 if (ret < 0)
252 return ret;
253
254 /* Set clock presc */
255 if (dw9768->clock_presc != DW9768_CLOCK_PRE_SCALE_DEFAULT) {
256 ret = dw9768_mod_reg(dw9768, DW9768_AAC_PRESC_REG,
257 DW9768_CLOCK_PRE_SCALE_SEL_MASK,
258 dw9768->clock_presc);
259 if (ret < 0)
260 return ret;
261 }
262
263 /* Set AAC Timing */
264 if (dw9768->aac_timing != DW9768_AAC_TIME_DEFAULT) {
265 ret = i2c_smbus_write_byte_data(client, DW9768_AAC_TIME_REG,
266 dw9768->aac_timing);
267 if (ret < 0)
268 return ret;
269 }
270
271 for (val = dw9768->focus->val % DW9768_MOVE_STEPS;
272 val <= dw9768->focus->val;
273 val += DW9768_MOVE_STEPS) {
274 ret = dw9768_set_dac(dw9768, val);
275 if (ret) {
276 dev_err(&client->dev, "I2C failure: %d", ret);
277 return ret;
278 }
279 usleep_range(dw9768->move_delay_us,
280 dw9768->move_delay_us + 1000);
281 }
282
283 return 0;
284 }
285
dw9768_release(struct dw9768 * dw9768)286 static int dw9768_release(struct dw9768 *dw9768)
287 {
288 struct i2c_client *client = v4l2_get_subdevdata(&dw9768->sd);
289 int ret, val;
290
291 val = round_down(dw9768->focus->val, DW9768_MOVE_STEPS);
292 for ( ; val >= 0; val -= DW9768_MOVE_STEPS) {
293 ret = dw9768_set_dac(dw9768, val);
294 if (ret) {
295 dev_err(&client->dev, "I2C write fail: %d", ret);
296 return ret;
297 }
298 usleep_range(dw9768->move_delay_us,
299 dw9768->move_delay_us + 1000);
300 }
301
302 ret = i2c_smbus_write_byte_data(client, DW9768_RING_PD_CONTROL_REG,
303 DW9768_PD_MODE_EN);
304 if (ret < 0)
305 return ret;
306
307 /*
308 * DW9769 requires waiting delay time of t_OPR
309 * after PD reset takes place.
310 */
311 usleep_range(DW9768_T_OPR_US, DW9768_T_OPR_US + 100);
312
313 return 0;
314 }
315
dw9768_runtime_suspend(struct device * dev)316 static int dw9768_runtime_suspend(struct device *dev)
317 {
318 struct i2c_client *client = to_i2c_client(dev);
319 struct v4l2_subdev *sd = i2c_get_clientdata(client);
320 struct dw9768 *dw9768 = sd_to_dw9768(sd);
321
322 dw9768_release(dw9768);
323 regulator_bulk_disable(ARRAY_SIZE(dw9768_supply_names),
324 dw9768->supplies);
325
326 return 0;
327 }
328
dw9768_runtime_resume(struct device * dev)329 static int dw9768_runtime_resume(struct device *dev)
330 {
331 struct i2c_client *client = to_i2c_client(dev);
332 struct v4l2_subdev *sd = i2c_get_clientdata(client);
333 struct dw9768 *dw9768 = sd_to_dw9768(sd);
334 int ret;
335
336 ret = regulator_bulk_enable(ARRAY_SIZE(dw9768_supply_names),
337 dw9768->supplies);
338 if (ret < 0) {
339 dev_err(dev, "failed to enable regulators\n");
340 return ret;
341 }
342
343 /*
344 * The datasheet refers to t_OPR that needs to be waited before sending
345 * I2C commands after power-up.
346 */
347 usleep_range(DW9768_T_OPR_US, DW9768_T_OPR_US + 100);
348
349 ret = dw9768_init(dw9768);
350 if (ret < 0)
351 goto disable_regulator;
352
353 return 0;
354
355 disable_regulator:
356 regulator_bulk_disable(ARRAY_SIZE(dw9768_supply_names),
357 dw9768->supplies);
358
359 return ret;
360 }
361
dw9768_set_ctrl(struct v4l2_ctrl * ctrl)362 static int dw9768_set_ctrl(struct v4l2_ctrl *ctrl)
363 {
364 struct dw9768 *dw9768 = container_of(ctrl->handler,
365 struct dw9768, ctrls);
366
367 if (ctrl->id == V4L2_CID_FOCUS_ABSOLUTE)
368 return dw9768_set_dac(dw9768, ctrl->val);
369
370 return 0;
371 }
372
373 static const struct v4l2_ctrl_ops dw9768_ctrl_ops = {
374 .s_ctrl = dw9768_set_ctrl,
375 };
376
dw9768_open(struct v4l2_subdev * sd,struct v4l2_subdev_fh * fh)377 static int dw9768_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
378 {
379 int ret;
380
381 ret = pm_runtime_get_sync(sd->dev);
382 if (ret < 0) {
383 pm_runtime_put_noidle(sd->dev);
384 return ret;
385 }
386
387 return 0;
388 }
389
dw9768_close(struct v4l2_subdev * sd,struct v4l2_subdev_fh * fh)390 static int dw9768_close(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
391 {
392 pm_runtime_put(sd->dev);
393
394 return 0;
395 }
396
397 static const struct v4l2_subdev_internal_ops dw9768_int_ops = {
398 .open = dw9768_open,
399 .close = dw9768_close,
400 };
401
402 static const struct v4l2_subdev_ops dw9768_ops = { };
403
dw9768_init_controls(struct dw9768 * dw9768)404 static int dw9768_init_controls(struct dw9768 *dw9768)
405 {
406 struct v4l2_ctrl_handler *hdl = &dw9768->ctrls;
407 const struct v4l2_ctrl_ops *ops = &dw9768_ctrl_ops;
408
409 v4l2_ctrl_handler_init(hdl, 1);
410
411 dw9768->focus = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FOCUS_ABSOLUTE, 0,
412 DW9768_MAX_FOCUS_POS,
413 DW9768_FOCUS_STEPS, 0);
414
415 if (hdl->error)
416 return hdl->error;
417
418 dw9768->sd.ctrl_handler = hdl;
419
420 return 0;
421 }
422
dw9768_probe(struct i2c_client * client)423 static int dw9768_probe(struct i2c_client *client)
424 {
425 struct device *dev = &client->dev;
426 struct dw9768 *dw9768;
427 unsigned int i;
428 int ret;
429
430 dw9768 = devm_kzalloc(dev, sizeof(*dw9768), GFP_KERNEL);
431 if (!dw9768)
432 return -ENOMEM;
433
434 /* Initialize subdev */
435 v4l2_i2c_subdev_init(&dw9768->sd, client, &dw9768_ops);
436
437 dw9768->aac_mode = DW9768_AAC_MODE_DEFAULT;
438 dw9768->aac_timing = DW9768_AAC_TIME_DEFAULT;
439 dw9768->clock_presc = DW9768_CLOCK_PRE_SCALE_DEFAULT;
440
441 /* Optional indication of AAC mode select */
442 fwnode_property_read_u32(dev_fwnode(dev), "dongwoon,aac-mode",
443 &dw9768->aac_mode);
444
445 /* Optional indication of clock pre-scale select */
446 fwnode_property_read_u32(dev_fwnode(dev), "dongwoon,clock-presc",
447 &dw9768->clock_presc);
448
449 /* Optional indication of AAC Timing */
450 fwnode_property_read_u32(dev_fwnode(dev), "dongwoon,aac-timing",
451 &dw9768->aac_timing);
452
453 dw9768->move_delay_us = dw9768_cal_move_delay(dw9768->aac_mode,
454 dw9768->clock_presc,
455 dw9768->aac_timing);
456
457 for (i = 0; i < ARRAY_SIZE(dw9768_supply_names); i++)
458 dw9768->supplies[i].supply = dw9768_supply_names[i];
459
460 ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(dw9768_supply_names),
461 dw9768->supplies);
462 if (ret) {
463 dev_err(dev, "failed to get regulators\n");
464 return ret;
465 }
466
467 /* Initialize controls */
468 ret = dw9768_init_controls(dw9768);
469 if (ret)
470 goto err_free_handler;
471
472 /* Initialize subdev */
473 dw9768->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
474 dw9768->sd.internal_ops = &dw9768_int_ops;
475
476 ret = media_entity_pads_init(&dw9768->sd.entity, 0, NULL);
477 if (ret < 0)
478 goto err_free_handler;
479
480 dw9768->sd.entity.function = MEDIA_ENT_F_LENS;
481
482 pm_runtime_enable(dev);
483 if (!pm_runtime_enabled(dev)) {
484 ret = dw9768_runtime_resume(dev);
485 if (ret < 0) {
486 dev_err(dev, "failed to power on: %d\n", ret);
487 goto err_clean_entity;
488 }
489 }
490
491 ret = v4l2_async_register_subdev(&dw9768->sd);
492 if (ret < 0) {
493 dev_err(dev, "failed to register V4L2 subdev: %d", ret);
494 goto err_power_off;
495 }
496
497 return 0;
498
499 err_power_off:
500 if (pm_runtime_enabled(dev))
501 pm_runtime_disable(dev);
502 else
503 dw9768_runtime_suspend(dev);
504 err_clean_entity:
505 media_entity_cleanup(&dw9768->sd.entity);
506 err_free_handler:
507 v4l2_ctrl_handler_free(&dw9768->ctrls);
508
509 return ret;
510 }
511
dw9768_remove(struct i2c_client * client)512 static int dw9768_remove(struct i2c_client *client)
513 {
514 struct v4l2_subdev *sd = i2c_get_clientdata(client);
515 struct dw9768 *dw9768 = sd_to_dw9768(sd);
516
517 v4l2_async_unregister_subdev(&dw9768->sd);
518 v4l2_ctrl_handler_free(&dw9768->ctrls);
519 media_entity_cleanup(&dw9768->sd.entity);
520 pm_runtime_disable(&client->dev);
521 if (!pm_runtime_status_suspended(&client->dev))
522 dw9768_runtime_suspend(&client->dev);
523 pm_runtime_set_suspended(&client->dev);
524
525 return 0;
526 }
527
528 static const struct of_device_id dw9768_of_table[] = {
529 { .compatible = "dongwoon,dw9768" },
530 { .compatible = "giantec,gt9769" },
531 {}
532 };
533 MODULE_DEVICE_TABLE(of, dw9768_of_table);
534
535 static const struct dev_pm_ops dw9768_pm_ops = {
536 SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
537 pm_runtime_force_resume)
538 SET_RUNTIME_PM_OPS(dw9768_runtime_suspend, dw9768_runtime_resume, NULL)
539 };
540
541 static struct i2c_driver dw9768_i2c_driver = {
542 .driver = {
543 .name = DW9768_NAME,
544 .pm = &dw9768_pm_ops,
545 .of_match_table = dw9768_of_table,
546 },
547 .probe_new = dw9768_probe,
548 .remove = dw9768_remove,
549 };
550 module_i2c_driver(dw9768_i2c_driver);
551
552 MODULE_AUTHOR("Dongchun Zhu <dongchun.zhu@mediatek.com>");
553 MODULE_DESCRIPTION("DW9768 VCM driver");
554 MODULE_LICENSE("GPL v2");
555