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27#include <linux/module.h>
28
29#include <drm/drm_drv.h>
30#include <drm/drm_encoder_slave.h>
31#include <drm/drm_print.h>
32#include <drm/drm_probe_helper.h>
33#include <drm/i2c/sil164.h>
34
35struct sil164_priv {
36 struct sil164_encoder_params config;
37 struct i2c_client *duallink_slave;
38
39 uint8_t saved_state[0x10];
40 uint8_t saved_slave_state[0x10];
41};
42
43#define to_sil164_priv(x) \
44 ((struct sil164_priv *)to_encoder_slave(x)->slave_priv)
45
46#define sil164_dbg(client, format, ...) do { \
47 if (drm_debug_enabled(DRM_UT_KMS)) \
48 dev_printk(KERN_DEBUG, &client->dev, \
49 "%s: " format, __func__, ## __VA_ARGS__); \
50 } while (0)
51#define sil164_info(client, format, ...) \
52 dev_info(&client->dev, format, __VA_ARGS__)
53#define sil164_err(client, format, ...) \
54 dev_err(&client->dev, format, __VA_ARGS__)
55
56#define SIL164_I2C_ADDR_MASTER 0x38
57#define SIL164_I2C_ADDR_SLAVE 0x39
58
59
60
61#define SIL164_VENDOR_LO 0x0
62#define SIL164_VENDOR_HI 0x1
63#define SIL164_DEVICE_LO 0x2
64#define SIL164_DEVICE_HI 0x3
65#define SIL164_REVISION 0x4
66#define SIL164_FREQ_MIN 0x6
67#define SIL164_FREQ_MAX 0x7
68#define SIL164_CONTROL0 0x8
69# define SIL164_CONTROL0_POWER_ON 0x01
70# define SIL164_CONTROL0_EDGE_RISING 0x02
71# define SIL164_CONTROL0_INPUT_24BIT 0x04
72# define SIL164_CONTROL0_DUAL_EDGE 0x08
73# define SIL164_CONTROL0_HSYNC_ON 0x10
74# define SIL164_CONTROL0_VSYNC_ON 0x20
75#define SIL164_DETECT 0x9
76# define SIL164_DETECT_INTR_STAT 0x01
77# define SIL164_DETECT_HOTPLUG_STAT 0x02
78# define SIL164_DETECT_RECEIVER_STAT 0x04
79# define SIL164_DETECT_INTR_MODE_RECEIVER 0x00
80# define SIL164_DETECT_INTR_MODE_HOTPLUG 0x08
81# define SIL164_DETECT_OUT_MODE_HIGH 0x00
82# define SIL164_DETECT_OUT_MODE_INTR 0x10
83# define SIL164_DETECT_OUT_MODE_RECEIVER 0x20
84# define SIL164_DETECT_OUT_MODE_HOTPLUG 0x30
85# define SIL164_DETECT_VSWING_STAT 0x80
86#define SIL164_CONTROL1 0xa
87# define SIL164_CONTROL1_DESKEW_ENABLE 0x10
88# define SIL164_CONTROL1_DESKEW_INCR_SHIFT 5
89#define SIL164_GPIO 0xb
90#define SIL164_CONTROL2 0xc
91# define SIL164_CONTROL2_FILTER_ENABLE 0x01
92# define SIL164_CONTROL2_FILTER_SETTING_SHIFT 1
93# define SIL164_CONTROL2_DUALLINK_MASTER 0x40
94# define SIL164_CONTROL2_SYNC_CONT 0x80
95#define SIL164_DUALLINK 0xd
96# define SIL164_DUALLINK_ENABLE 0x10
97# define SIL164_DUALLINK_SKEW_SHIFT 5
98#define SIL164_PLLZONE 0xe
99# define SIL164_PLLZONE_STAT 0x08
100# define SIL164_PLLZONE_FORCE_ON 0x10
101# define SIL164_PLLZONE_FORCE_HIGH 0x20
102
103
104
105static void
106sil164_write(struct i2c_client *client, uint8_t addr, uint8_t val)
107{
108 uint8_t buf[] = {addr, val};
109 int ret;
110
111 ret = i2c_master_send(client, buf, ARRAY_SIZE(buf));
112 if (ret < 0)
113 sil164_err(client, "Error %d writing to subaddress 0x%x\n",
114 ret, addr);
115}
116
117static uint8_t
118sil164_read(struct i2c_client *client, uint8_t addr)
119{
120 uint8_t val;
121 int ret;
122
123 ret = i2c_master_send(client, &addr, sizeof(addr));
124 if (ret < 0)
125 goto fail;
126
127 ret = i2c_master_recv(client, &val, sizeof(val));
128 if (ret < 0)
129 goto fail;
130
131 return val;
132
133fail:
134 sil164_err(client, "Error %d reading from subaddress 0x%x\n",
135 ret, addr);
136 return 0;
137}
138
139static void
140sil164_save_state(struct i2c_client *client, uint8_t *state)
141{
142 int i;
143
144 for (i = 0x8; i <= 0xe; i++)
145 state[i] = sil164_read(client, i);
146}
147
148static void
149sil164_restore_state(struct i2c_client *client, uint8_t *state)
150{
151 int i;
152
153 for (i = 0x8; i <= 0xe; i++)
154 sil164_write(client, i, state[i]);
155}
156
157static void
158sil164_set_power_state(struct i2c_client *client, bool on)
159{
160 uint8_t control0 = sil164_read(client, SIL164_CONTROL0);
161
162 if (on)
163 control0 |= SIL164_CONTROL0_POWER_ON;
164 else
165 control0 &= ~SIL164_CONTROL0_POWER_ON;
166
167 sil164_write(client, SIL164_CONTROL0, control0);
168}
169
170static void
171sil164_init_state(struct i2c_client *client,
172 struct sil164_encoder_params *config,
173 bool duallink)
174{
175 sil164_write(client, SIL164_CONTROL0,
176 SIL164_CONTROL0_HSYNC_ON |
177 SIL164_CONTROL0_VSYNC_ON |
178 (config->input_edge ? SIL164_CONTROL0_EDGE_RISING : 0) |
179 (config->input_width ? SIL164_CONTROL0_INPUT_24BIT : 0) |
180 (config->input_dual ? SIL164_CONTROL0_DUAL_EDGE : 0));
181
182 sil164_write(client, SIL164_DETECT,
183 SIL164_DETECT_INTR_STAT |
184 SIL164_DETECT_OUT_MODE_RECEIVER);
185
186 sil164_write(client, SIL164_CONTROL1,
187 (config->input_skew ? SIL164_CONTROL1_DESKEW_ENABLE : 0) |
188 (((config->input_skew + 4) & 0x7)
189 << SIL164_CONTROL1_DESKEW_INCR_SHIFT));
190
191 sil164_write(client, SIL164_CONTROL2,
192 SIL164_CONTROL2_SYNC_CONT |
193 (config->pll_filter ? 0 : SIL164_CONTROL2_FILTER_ENABLE) |
194 (4 << SIL164_CONTROL2_FILTER_SETTING_SHIFT));
195
196 sil164_write(client, SIL164_PLLZONE, 0);
197
198 if (duallink)
199 sil164_write(client, SIL164_DUALLINK,
200 SIL164_DUALLINK_ENABLE |
201 (((config->duallink_skew + 4) & 0x7)
202 << SIL164_DUALLINK_SKEW_SHIFT));
203 else
204 sil164_write(client, SIL164_DUALLINK, 0);
205}
206
207
208
209static void
210sil164_encoder_set_config(struct drm_encoder *encoder, void *params)
211{
212 struct sil164_priv *priv = to_sil164_priv(encoder);
213
214 priv->config = *(struct sil164_encoder_params *)params;
215}
216
217static void
218sil164_encoder_dpms(struct drm_encoder *encoder, int mode)
219{
220 struct sil164_priv *priv = to_sil164_priv(encoder);
221 bool on = (mode == DRM_MODE_DPMS_ON);
222 bool duallink = (on && encoder->crtc->mode.clock > 165000);
223
224 sil164_set_power_state(drm_i2c_encoder_get_client(encoder), on);
225
226 if (priv->duallink_slave)
227 sil164_set_power_state(priv->duallink_slave, duallink);
228}
229
230static void
231sil164_encoder_save(struct drm_encoder *encoder)
232{
233 struct sil164_priv *priv = to_sil164_priv(encoder);
234
235 sil164_save_state(drm_i2c_encoder_get_client(encoder),
236 priv->saved_state);
237
238 if (priv->duallink_slave)
239 sil164_save_state(priv->duallink_slave,
240 priv->saved_slave_state);
241}
242
243static void
244sil164_encoder_restore(struct drm_encoder *encoder)
245{
246 struct sil164_priv *priv = to_sil164_priv(encoder);
247
248 sil164_restore_state(drm_i2c_encoder_get_client(encoder),
249 priv->saved_state);
250
251 if (priv->duallink_slave)
252 sil164_restore_state(priv->duallink_slave,
253 priv->saved_slave_state);
254}
255
256static int
257sil164_encoder_mode_valid(struct drm_encoder *encoder,
258 struct drm_display_mode *mode)
259{
260 struct sil164_priv *priv = to_sil164_priv(encoder);
261
262 if (mode->clock < 32000)
263 return MODE_CLOCK_LOW;
264
265 if (mode->clock > 330000 ||
266 (mode->clock > 165000 && !priv->duallink_slave))
267 return MODE_CLOCK_HIGH;
268
269 return MODE_OK;
270}
271
272static void
273sil164_encoder_mode_set(struct drm_encoder *encoder,
274 struct drm_display_mode *mode,
275 struct drm_display_mode *adjusted_mode)
276{
277 struct sil164_priv *priv = to_sil164_priv(encoder);
278 bool duallink = adjusted_mode->clock > 165000;
279
280 sil164_init_state(drm_i2c_encoder_get_client(encoder),
281 &priv->config, duallink);
282
283 if (priv->duallink_slave)
284 sil164_init_state(priv->duallink_slave,
285 &priv->config, duallink);
286
287 sil164_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
288}
289
290static enum drm_connector_status
291sil164_encoder_detect(struct drm_encoder *encoder,
292 struct drm_connector *connector)
293{
294 struct i2c_client *client = drm_i2c_encoder_get_client(encoder);
295
296 if (sil164_read(client, SIL164_DETECT) & SIL164_DETECT_HOTPLUG_STAT)
297 return connector_status_connected;
298 else
299 return connector_status_disconnected;
300}
301
302static int
303sil164_encoder_get_modes(struct drm_encoder *encoder,
304 struct drm_connector *connector)
305{
306 return 0;
307}
308
309static int
310sil164_encoder_create_resources(struct drm_encoder *encoder,
311 struct drm_connector *connector)
312{
313 return 0;
314}
315
316static int
317sil164_encoder_set_property(struct drm_encoder *encoder,
318 struct drm_connector *connector,
319 struct drm_property *property,
320 uint64_t val)
321{
322 return 0;
323}
324
325static void
326sil164_encoder_destroy(struct drm_encoder *encoder)
327{
328 struct sil164_priv *priv = to_sil164_priv(encoder);
329
330 i2c_unregister_device(priv->duallink_slave);
331
332 kfree(priv);
333 drm_i2c_encoder_destroy(encoder);
334}
335
336static const struct drm_encoder_slave_funcs sil164_encoder_funcs = {
337 .set_config = sil164_encoder_set_config,
338 .destroy = sil164_encoder_destroy,
339 .dpms = sil164_encoder_dpms,
340 .save = sil164_encoder_save,
341 .restore = sil164_encoder_restore,
342 .mode_valid = sil164_encoder_mode_valid,
343 .mode_set = sil164_encoder_mode_set,
344 .detect = sil164_encoder_detect,
345 .get_modes = sil164_encoder_get_modes,
346 .create_resources = sil164_encoder_create_resources,
347 .set_property = sil164_encoder_set_property,
348};
349
350
351
352static int
353sil164_probe(struct i2c_client *client, const struct i2c_device_id *id)
354{
355 int vendor = sil164_read(client, SIL164_VENDOR_HI) << 8 |
356 sil164_read(client, SIL164_VENDOR_LO);
357 int device = sil164_read(client, SIL164_DEVICE_HI) << 8 |
358 sil164_read(client, SIL164_DEVICE_LO);
359 int rev = sil164_read(client, SIL164_REVISION);
360
361 if (vendor != 0x1 || device != 0x6) {
362 sil164_dbg(client, "Unknown device %x:%x.%x\n",
363 vendor, device, rev);
364 return -ENODEV;
365 }
366
367 sil164_info(client, "Detected device %x:%x.%x\n",
368 vendor, device, rev);
369
370 return 0;
371}
372
373static int
374sil164_remove(struct i2c_client *client)
375{
376 return 0;
377}
378
379static struct i2c_client *
380sil164_detect_slave(struct i2c_client *client)
381{
382 struct i2c_adapter *adap = client->adapter;
383 struct i2c_msg msg = {
384 .addr = SIL164_I2C_ADDR_SLAVE,
385 .len = 0,
386 };
387 const struct i2c_board_info info = {
388 I2C_BOARD_INFO("sil164", SIL164_I2C_ADDR_SLAVE)
389 };
390
391 if (i2c_transfer(adap, &msg, 1) != 1) {
392 sil164_dbg(adap, "No dual-link slave found.");
393 return NULL;
394 }
395
396 return i2c_new_client_device(adap, &info);
397}
398
399static int
400sil164_encoder_init(struct i2c_client *client,
401 struct drm_device *dev,
402 struct drm_encoder_slave *encoder)
403{
404 struct sil164_priv *priv;
405 struct i2c_client *slave_client;
406
407 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
408 if (!priv)
409 return -ENOMEM;
410
411 encoder->slave_priv = priv;
412 encoder->slave_funcs = &sil164_encoder_funcs;
413
414 slave_client = sil164_detect_slave(client);
415 if (!IS_ERR(slave_client))
416 priv->duallink_slave = slave_client;
417
418 return 0;
419}
420
421static const struct i2c_device_id sil164_ids[] = {
422 { "sil164", 0 },
423 { }
424};
425MODULE_DEVICE_TABLE(i2c, sil164_ids);
426
427static struct drm_i2c_encoder_driver sil164_driver = {
428 .i2c_driver = {
429 .probe = sil164_probe,
430 .remove = sil164_remove,
431 .driver = {
432 .name = "sil164",
433 },
434 .id_table = sil164_ids,
435 },
436 .encoder_init = sil164_encoder_init,
437};
438
439
440
441static int __init
442sil164_init(void)
443{
444 return drm_i2c_encoder_register(THIS_MODULE, &sil164_driver);
445}
446
447static void __exit
448sil164_exit(void)
449{
450 drm_i2c_encoder_unregister(&sil164_driver);
451}
452
453MODULE_AUTHOR("Francisco Jerez <currojerez@riseup.net>");
454MODULE_DESCRIPTION("Silicon Image sil164 TMDS transmitter driver");
455MODULE_LICENSE("GPL and additional rights");
456
457module_init(sil164_init);
458module_exit(sil164_exit);
459
