aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/i2c/sil164_drv.c
blob: b7d45ab4ba699d12590ab74489ebf6f58ba25cfe (plain) (blame)
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
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
/*
 * Copyright (C) 2010 Francisco Jerez.
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial
 * portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 */

#include <linux/module.h>

#include "drmP.h"
#include "drm_crtc_helper.h"
#include "drm_encoder_slave.h"
#include "i2c/sil164.h"

struct sil164_priv {
	struct sil164_encoder_params config;
	struct i2c_client *duallink_slave;

	uint8_t saved_state[0x10];
	uint8_t saved_slave_state[0x10];
};

#define to_sil164_priv(x) \
	((struct sil164_priv *)to_encoder_slave(x)->slave_priv)

#define sil164_dbg(client, format, ...) do {				\
		if (drm_debug & DRM_UT_KMS)				\
			dev_printk(KERN_DEBUG, &client->dev,		\
				   "%s: " format, __func__, ## __VA_ARGS__); \
	} while (0)
#define sil164_info(client, format, ...)		\
	dev_info(&client->dev, format, __VA_ARGS__)
#define sil164_err(client, format, ...)			\
	dev_err(&client->dev, format, __VA_ARGS__)

#define SIL164_I2C_ADDR_MASTER			0x38
#define SIL164_I2C_ADDR_SLAVE			0x39

/* HW register definitions */

#define SIL164_VENDOR_LO			0x0
#define SIL164_VENDOR_HI			0x1
#define SIL164_DEVICE_LO			0x2
#define SIL164_DEVICE_HI			0x3
#define SIL164_REVISION				0x4
#define SIL164_FREQ_MIN				0x6
#define SIL164_FREQ_MAX				0x7
#define SIL164_CONTROL0				0x8
#  define SIL164_CONTROL0_POWER_ON		0x01
#  define SIL164_CONTROL0_EDGE_RISING		0x02
#  define SIL164_CONTROL0_INPUT_24BIT		0x04
#  define SIL164_CONTROL0_DUAL_EDGE		0x08
#  define SIL164_CONTROL0_HSYNC_ON		0x10
#  define SIL164_CONTROL0_VSYNC_ON		0x20
#define SIL164_DETECT				0x9
#  define SIL164_DETECT_INTR_STAT		0x01
#  define SIL164_DETECT_HOTPLUG_STAT		0x02
#  define SIL164_DETECT_RECEIVER_STAT		0x04
#  define SIL164_DETECT_INTR_MODE_RECEIVER	0x00
#  define SIL164_DETECT_INTR_MODE_HOTPLUG	0x08
#  define SIL164_DETECT_OUT_MODE_HIGH		0x00
#  define SIL164_DETECT_OUT_MODE_INTR		0x10
#  define SIL164_DETECT_OUT_MODE_RECEIVER	0x20
#  define SIL164_DETECT_OUT_MODE_HOTPLUG	0x30
#  define SIL164_DETECT_VSWING_STAT		0x80
#define SIL164_CONTROL1				0xa
#  define SIL164_CONTROL1_DESKEW_ENABLE		0x10
#  define SIL164_CONTROL1_DESKEW_INCR_SHIFT	5
#define SIL164_GPIO				0xb
#define SIL164_CONTROL2				0xc
#  define SIL164_CONTROL2_FILTER_ENABLE		0x01
#  define SIL164_CONTROL2_FILTER_SETTING_SHIFT	1
#  define SIL164_CONTROL2_DUALLINK_MASTER	0x40
#  define SIL164_CONTROL2_SYNC_CONT		0x80
#define SIL164_DUALLINK				0xd
#  define SIL164_DUALLINK_ENABLE		0x10
#  define SIL164_DUALLINK_SKEW_SHIFT		5
#define SIL164_PLLZONE				0xe
#  define SIL164_PLLZONE_STAT			0x08
#  define SIL164_PLLZONE_FORCE_ON		0x10
#  define SIL164_PLLZONE_FORCE_HIGH		0x20

/* HW access functions */

static void
sil164_write(struct i2c_client *client, uint8_t addr, uint8_t val)
{
	uint8_t buf[] = {addr, val};
	int ret;

	ret = i2c_master_send(client, buf, ARRAY_SIZE(buf));
	if (ret < 0)
		sil164_err(client, "Error %d writing to subaddress 0x%x\n",
			   ret, addr);
}

static uint8_t
sil164_read(struct i2c_client *client, uint8_t addr)
{
	uint8_t val;
	int ret;

	ret = i2c_master_send(client, &addr, sizeof(addr));
	if (ret < 0)
		goto fail;

	ret = i2c_master_recv(client, &val, sizeof(val));
	if (ret < 0)
		goto fail;

	return val;

fail:
	sil164_err(client, "Error %d reading from subaddress 0x%x\n",
		   ret, addr);
	return 0;
}

static void
sil164_save_state(struct i2c_client *client, uint8_t *state)
{
	int i;

	for (i = 0x8; i <= 0xe; i++)
		state[i] = sil164_read(client, i);
}

static void
sil164_restore_state(struct i2c_client *client, uint8_t *state)
{
	int i;

	for (i = 0x8; i <= 0xe; i++)
		sil164_write(client, i, state[i]);
}

static void
sil164_set_power_state(struct i2c_client *client, bool on)
{
	uint8_t control0 = sil164_read(client, SIL164_CONTROL0);

	if (on)
		control0 |= SIL164_CONTROL0_POWER_ON;
	else
		control0 &= ~SIL164_CONTROL0_POWER_ON;

	sil164_write(client, SIL164_CONTROL0, control0);
}

static void
sil164_init_state(struct i2c_client *client,
		  struct sil164_encoder_params *config,
		  bool duallink)
{
	sil164_write(client, SIL164_CONTROL0,
		     SIL164_CONTROL0_HSYNC_ON |
		     SIL164_CONTROL0_VSYNC_ON |
		     (config->input_edge ? SIL164_CONTROL0_EDGE_RISING : 0) |
		     (config->input_width ? SIL164_CONTROL0_INPUT_24BIT : 0) |
		     (config->input_dual ? SIL164_CONTROL0_DUAL_EDGE : 0));

	sil164_write(client, SIL164_DETECT,
		     SIL164_DETECT_INTR_STAT |
		     SIL164_DETECT_OUT_MODE_RECEIVER);

	sil164_write(client, SIL164_CONTROL1,
		     (config->input_skew ? SIL164_CONTROL1_DESKEW_ENABLE : 0) |
		     (((config->input_skew + 4) & 0x7)
		      << SIL164_CONTROL1_DESKEW_INCR_SHIFT));

	sil164_write(client, SIL164_CONTROL2,
		     SIL164_CONTROL2_SYNC_CONT |
		     (config->pll_filter ? 0 : SIL164_CONTROL2_FILTER_ENABLE) |
		     (4 << SIL164_CONTROL2_FILTER_SETTING_SHIFT));

	sil164_write(client, SIL164_PLLZONE, 0);

	if (duallink)
		sil164_write(client, SIL164_DUALLINK,
			     SIL164_DUALLINK_ENABLE |
			     (((config->duallink_skew + 4) & 0x7)
			      << SIL164_DUALLINK_SKEW_SHIFT));
	else
		sil164_write(client, SIL164_DUALLINK, 0);
}

/* DRM encoder functions */

static void
sil164_encoder_set_config(struct drm_encoder *encoder, void *params)
{
	struct sil164_priv *priv = to_sil164_priv(encoder);

	priv->config = *(struct sil164_encoder_params *)params;
}

static void
sil164_encoder_dpms(struct drm_encoder *encoder, int mode)
{
	struct sil164_priv *priv = to_sil164_priv(encoder);
	bool on = (mode == DRM_MODE_DPMS_ON);
	bool duallink = (on && encoder->crtc->mode.clock > 165000);

	sil164_set_power_state(drm_i2c_encoder_get_client(encoder), on);

	if (priv->duallink_slave)
		sil164_set_power_state(priv->duallink_slave, duallink);
}

static void
sil164_encoder_save(struct drm_encoder *encoder)
{
	struct sil164_priv *priv = to_sil164_priv(encoder);

	sil164_save_state(drm_i2c_encoder_get_client(encoder),
			  priv->saved_state);

	if (priv->duallink_slave)
		sil164_save_state(priv->duallink_slave,
				  priv->saved_slave_state);
}

static void
sil164_encoder_restore(struct drm_encoder *encoder)
{
	struct sil164_priv *priv = to_sil164_priv(encoder);

	sil164_restore_state(drm_i2c_encoder_get_client(encoder),
			     priv->saved_state);

	if (priv->duallink_slave)
		sil164_restore_state(priv->duallink_slave,
				     priv->saved_slave_state);
}

static bool
sil164_encoder_mode_fixup(struct drm_encoder *encoder,
			  struct drm_display_mode *mode,
			  struct drm_display_mode *adjusted_mode)
{
	return true;
}

static int
sil164_encoder_mode_valid(struct drm_encoder *encoder,
			  struct drm_display_mode *mode)
{
	struct sil164_priv *priv = to_sil164_priv(encoder);

	if (mode->clock < 32000)
		return MODE_CLOCK_LOW;

	if (mode->clock > 330000 ||
	    (mode->clock > 165000 && !priv->duallink_slave))
		return MODE_CLOCK_HIGH;

	return MODE_OK;
}

static void
sil164_encoder_mode_set(struct drm_encoder *encoder,
			struct drm_display_mode *mode,
			struct drm_display_mode *adjusted_mode)
{
	struct sil164_priv *priv = to_sil164_priv(encoder);
	bool duallink = adjusted_mode->clock > 165000;

	sil164_init_state(drm_i2c_encoder_get_client(encoder),
			  &priv->config, duallink);

	if (priv->duallink_slave)
		sil164_init_state(priv->duallink_slave,
				  &priv->config, duallink);

	sil164_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
}

static enum drm_connector_status
sil164_encoder_detect(struct drm_encoder *encoder,
		      struct drm_connector *connector)
{
	struct i2c_client *client = drm_i2c_encoder_get_client(encoder);

	if (sil164_read(client, SIL164_DETECT) & SIL164_DETECT_HOTPLUG_STAT)
		return connector_status_connected;
	else
		return connector_status_disconnected;
}

static int
sil164_encoder_get_modes(struct drm_encoder *encoder,
			 struct drm_connector *connector)
{
	return 0;
}

static int
sil164_encoder_create_resources(struct drm_encoder *encoder,
				struct drm_connector *connector)
{
	return 0;
}

static int
sil164_encoder_set_property(struct drm_encoder *encoder,
			    struct drm_connector *connector,
			    struct drm_property *property,
			    uint64_t val)
{
	return 0;
}

static void
sil164_encoder_destroy(struct drm_encoder *encoder)
{
	struct sil164_priv *priv = to_sil164_priv(encoder);

	if (priv->duallink_slave)
		i2c_unregister_device(priv->duallink_slave);

	kfree(priv);
	drm_i2c_encoder_destroy(encoder);
}

static struct drm_encoder_slave_funcs sil164_encoder_funcs = {
	.set_config = sil164_encoder_set_config,
	.destroy = sil164_encoder_destroy,
	.dpms = sil164_encoder_dpms,
	.save = sil164_encoder_save,
	.restore = sil164_encoder_restore,
	.mode_fixup = sil164_encoder_mode_fixup,
	.mode_valid = sil164_encoder_mode_valid,
	.mode_set = sil164_encoder_mode_set,
	.detect = sil164_encoder_detect,
	.get_modes = sil164_encoder_get_modes,
	.create_resources = sil164_encoder_create_resources,
	.set_property = sil164_encoder_set_property,
};

/* I2C driver functions */

static int
sil164_probe(struct i2c_client *client, const struct i2c_device_id *id)
{
	int vendor = sil164_read(client, SIL164_VENDOR_HI) << 8 |
		sil164_read(client, SIL164_VENDOR_LO);
	int device = sil164_read(client, SIL164_DEVICE_HI) << 8 |
		sil164_read(client, SIL164_DEVICE_LO);
	int rev = sil164_read(client, SIL164_REVISION);

	if (vendor != 0x1 || device != 0x6) {
		sil164_dbg(client, "Unknown device %x:%x.%x\n",
			   vendor, device, rev);
		return -ENODEV;
	}

	sil164_info(client, "Detected device %x:%x.%x\n",
		    vendor, device, rev);

	return 0;
}

static int
sil164_remove(struct i2c_client *client)
{
	return 0;
}

static struct i2c_client *
sil164_detect_slave(struct i2c_client *client)
{
	struct i2c_adapter *adap = client->adapter;
	struct i2c_msg msg = {
		.addr = SIL164_I2C_ADDR_SLAVE,
		.len = 0,
	};
	const struct i2c_board_info info = {
		I2C_BOARD_INFO("sil164", SIL164_I2C_ADDR_SLAVE)
	};

	if (i2c_transfer(adap, &msg, 1) != 1) {
		sil164_dbg(adap, "No dual-link slave found.");
		return NULL;
	}

	return i2c_new_device(adap, &info);
}

static int
sil164_encoder_init(struct i2c_client *client,
		    struct drm_device *dev,
		    struct drm_encoder_slave *encoder)
{
	struct sil164_priv *priv;

	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	encoder->slave_priv = priv;
	encoder->slave_funcs = &sil164_encoder_funcs;

	priv->duallink_slave = sil164_detect_slave(client);

	return 0;
}

static struct i2c_device_id sil164_ids[] = {
	{ "sil164", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, sil164_ids);

static struct drm_i2c_encoder_driver sil164_driver = {
	.i2c_driver = {
		.probe = sil164_probe,
		.remove = sil164_remove,
		.driver = {
			.name = "sil164",
		},
		.id_table = sil164_ids,
	},
	.encoder_init = sil164_encoder_init,
};

/* Module initialization */

static int __init
sil164_init(void)
{
	return drm_i2c_encoder_register(THIS_MODULE, &sil164_driver);
}

static void __exit
sil164_exit(void)
{
	drm_i2c_encoder_unregister(&sil164_driver);
}

MODULE_AUTHOR("Francisco Jerez <currojerez@riseup.net>");
MODULE_DESCRIPTION("Silicon Image sil164 TMDS transmitter driver");
MODULE_LICENSE("GPL and additional rights");

module_init(sil164_init);
module_exit(sil164_exit);