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27#include <linux/module.h>
28
29#include <drm/drmP.h>
30#include <drm/drm_crtc_helper.h>
31#include <drm/drm_encoder_slave.h>
32#include <drm/i2c/sil164.h>
33
34struct sil164_priv {
35 struct sil164_encoder_params config;
36 struct i2c_client *duallink_slave;
37
38 uint8_t saved_state[0x10];
39 uint8_t saved_slave_state[0x10];
40};
41
42#define to_sil164_priv(x) \
43 ((struct sil164_priv *)to_encoder_slave(x)->slave_priv)
44
45#define sil164_dbg(client, format, ...) do { \
46 if (drm_debug & DRM_UT_KMS) \
47 dev_printk(KERN_DEBUG, &client->dev, \
48 "%s: " format, __func__, ## __VA_ARGS__); \
49 } while (0)
50#define sil164_info(client, format, ...) \
51 dev_info(&client->dev, format, __VA_ARGS__)
52#define sil164_err(client, format, ...) \
53 dev_err(&client->dev, format, __VA_ARGS__)
54
55#define SIL164_I2C_ADDR_MASTER 0x38
56#define SIL164_I2C_ADDR_SLAVE 0x39
57
58
59
60#define SIL164_VENDOR_LO 0x0
61#define SIL164_VENDOR_HI 0x1
62#define SIL164_DEVICE_LO 0x2
63#define SIL164_DEVICE_HI 0x3
64#define SIL164_REVISION 0x4
65#define SIL164_FREQ_MIN 0x6
66#define SIL164_FREQ_MAX 0x7
67#define SIL164_CONTROL0 0x8
68# define SIL164_CONTROL0_POWER_ON 0x01
69# define SIL164_CONTROL0_EDGE_RISING 0x02
70# define SIL164_CONTROL0_INPUT_24BIT 0x04
71# define SIL164_CONTROL0_DUAL_EDGE 0x08
72# define SIL164_CONTROL0_HSYNC_ON 0x10
73# define SIL164_CONTROL0_VSYNC_ON 0x20
74#define SIL164_DETECT 0x9
75# define SIL164_DETECT_INTR_STAT 0x01
76# define SIL164_DETECT_HOTPLUG_STAT 0x02
77# define SIL164_DETECT_RECEIVER_STAT 0x04
78# define SIL164_DETECT_INTR_MODE_RECEIVER 0x00
79# define SIL164_DETECT_INTR_MODE_HOTPLUG 0x08
80# define SIL164_DETECT_OUT_MODE_HIGH 0x00
81# define SIL164_DETECT_OUT_MODE_INTR 0x10
82# define SIL164_DETECT_OUT_MODE_RECEIVER 0x20
83# define SIL164_DETECT_OUT_MODE_HOTPLUG 0x30
84# define SIL164_DETECT_VSWING_STAT 0x80
85#define SIL164_CONTROL1 0xa
86# define SIL164_CONTROL1_DESKEW_ENABLE 0x10
87# define SIL164_CONTROL1_DESKEW_INCR_SHIFT 5
88#define SIL164_GPIO 0xb
89#define SIL164_CONTROL2 0xc
90# define SIL164_CONTROL2_FILTER_ENABLE 0x01
91# define SIL164_CONTROL2_FILTER_SETTING_SHIFT 1
92# define SIL164_CONTROL2_DUALLINK_MASTER 0x40
93# define SIL164_CONTROL2_SYNC_CONT 0x80
94#define SIL164_DUALLINK 0xd
95# define SIL164_DUALLINK_ENABLE 0x10
96# define SIL164_DUALLINK_SKEW_SHIFT 5
97#define SIL164_PLLZONE 0xe
98# define SIL164_PLLZONE_STAT 0x08
99# define SIL164_PLLZONE_FORCE_ON 0x10
100# define SIL164_PLLZONE_FORCE_HIGH 0x20
101
102
103
104static void
105sil164_write(struct i2c_client *client, uint8_t addr, uint8_t val)
106{
107 uint8_t buf[] = {addr, val};
108 int ret;
109
110 ret = i2c_master_send(client, buf, ARRAY_SIZE(buf));
111 if (ret < 0)
112 sil164_err(client, "Error %d writing to subaddress 0x%x\n",
113 ret, addr);
114}
115
116static uint8_t
117sil164_read(struct i2c_client *client, uint8_t addr)
118{
119 uint8_t val;
120 int ret;
121
122 ret = i2c_master_send(client, &addr, sizeof(addr));
123 if (ret < 0)
124 goto fail;
125
126 ret = i2c_master_recv(client, &val, sizeof(val));
127 if (ret < 0)
128 goto fail;
129
130 return val;
131
132fail:
133 sil164_err(client, "Error %d reading from subaddress 0x%x\n",
134 ret, addr);
135 return 0;
136}
137
138static void
139sil164_save_state(struct i2c_client *client, uint8_t *state)
140{
141 int i;
142
143 for (i = 0x8; i <= 0xe; i++)
144 state[i] = sil164_read(client, i);
145}
146
147static void
148sil164_restore_state(struct i2c_client *client, uint8_t *state)
149{
150 int i;
151
152 for (i = 0x8; i <= 0xe; i++)
153 sil164_write(client, i, state[i]);
154}
155
156static void
157sil164_set_power_state(struct i2c_client *client, bool on)
158{
159 uint8_t control0 = sil164_read(client, SIL164_CONTROL0);
160
161 if (on)
162 control0 |= SIL164_CONTROL0_POWER_ON;
163 else
164 control0 &= ~SIL164_CONTROL0_POWER_ON;
165
166 sil164_write(client, SIL164_CONTROL0, control0);
167}
168
169static void
170sil164_init_state(struct i2c_client *client,
171 struct sil164_encoder_params *config,
172 bool duallink)
173{
174 sil164_write(client, SIL164_CONTROL0,
175 SIL164_CONTROL0_HSYNC_ON |
176 SIL164_CONTROL0_VSYNC_ON |
177 (config->input_edge ? SIL164_CONTROL0_EDGE_RISING : 0) |
178 (config->input_width ? SIL164_CONTROL0_INPUT_24BIT : 0) |
179 (config->input_dual ? SIL164_CONTROL0_DUAL_EDGE : 0));
180
181 sil164_write(client, SIL164_DETECT,
182 SIL164_DETECT_INTR_STAT |
183 SIL164_DETECT_OUT_MODE_RECEIVER);
184
185 sil164_write(client, SIL164_CONTROL1,
186 (config->input_skew ? SIL164_CONTROL1_DESKEW_ENABLE : 0) |
187 (((config->input_skew + 4) & 0x7)
188 << SIL164_CONTROL1_DESKEW_INCR_SHIFT));
189
190 sil164_write(client, SIL164_CONTROL2,
191 SIL164_CONTROL2_SYNC_CONT |
192 (config->pll_filter ? 0 : SIL164_CONTROL2_FILTER_ENABLE) |
193 (4 << SIL164_CONTROL2_FILTER_SETTING_SHIFT));
194
195 sil164_write(client, SIL164_PLLZONE, 0);
196
197 if (duallink)
198 sil164_write(client, SIL164_DUALLINK,
199 SIL164_DUALLINK_ENABLE |
200 (((config->duallink_skew + 4) & 0x7)
201 << SIL164_DUALLINK_SKEW_SHIFT));
202 else
203 sil164_write(client, SIL164_DUALLINK, 0);
204}
205
206
207
208static void
209sil164_encoder_set_config(struct drm_encoder *encoder, void *params)
210{
211 struct sil164_priv *priv = to_sil164_priv(encoder);
212
213 priv->config = *(struct sil164_encoder_params *)params;
214}
215
216static void
217sil164_encoder_dpms(struct drm_encoder *encoder, int mode)
218{
219 struct sil164_priv *priv = to_sil164_priv(encoder);
220 bool on = (mode == DRM_MODE_DPMS_ON);
221 bool duallink = (on && encoder->crtc->mode.clock > 165000);
222
223 sil164_set_power_state(drm_i2c_encoder_get_client(encoder), on);
224
225 if (priv->duallink_slave)
226 sil164_set_power_state(priv->duallink_slave, duallink);
227}
228
229static void
230sil164_encoder_save(struct drm_encoder *encoder)
231{
232 struct sil164_priv *priv = to_sil164_priv(encoder);
233
234 sil164_save_state(drm_i2c_encoder_get_client(encoder),
235 priv->saved_state);
236
237 if (priv->duallink_slave)
238 sil164_save_state(priv->duallink_slave,
239 priv->saved_slave_state);
240}
241
242static void
243sil164_encoder_restore(struct drm_encoder *encoder)
244{
245 struct sil164_priv *priv = to_sil164_priv(encoder);
246
247 sil164_restore_state(drm_i2c_encoder_get_client(encoder),
248 priv->saved_state);
249
250 if (priv->duallink_slave)
251 sil164_restore_state(priv->duallink_slave,
252 priv->saved_slave_state);
253}
254
255static int
256sil164_encoder_mode_valid(struct drm_encoder *encoder,
257 struct drm_display_mode *mode)
258{
259 struct sil164_priv *priv = to_sil164_priv(encoder);
260
261 if (mode->clock < 32000)
262 return MODE_CLOCK_LOW;
263
264 if (mode->clock > 330000 ||
265 (mode->clock > 165000 && !priv->duallink_slave))
266 return MODE_CLOCK_HIGH;
267
268 return MODE_OK;
269}
270
271static void
272sil164_encoder_mode_set(struct drm_encoder *encoder,
273 struct drm_display_mode *mode,
274 struct drm_display_mode *adjusted_mode)
275{
276 struct sil164_priv *priv = to_sil164_priv(encoder);
277 bool duallink = adjusted_mode->clock > 165000;
278
279 sil164_init_state(drm_i2c_encoder_get_client(encoder),
280 &priv->config, duallink);
281
282 if (priv->duallink_slave)
283 sil164_init_state(priv->duallink_slave,
284 &priv->config, duallink);
285
286 sil164_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
287}
288
289static enum drm_connector_status
290sil164_encoder_detect(struct drm_encoder *encoder,
291 struct drm_connector *connector)
292{
293 struct i2c_client *client = drm_i2c_encoder_get_client(encoder);
294
295 if (sil164_read(client, SIL164_DETECT) & SIL164_DETECT_HOTPLUG_STAT)
296 return connector_status_connected;
297 else
298 return connector_status_disconnected;
299}
300
301static int
302sil164_encoder_get_modes(struct drm_encoder *encoder,
303 struct drm_connector *connector)
304{
305 return 0;
306}
307
308static int
309sil164_encoder_create_resources(struct drm_encoder *encoder,
310 struct drm_connector *connector)
311{
312 return 0;
313}
314
315static int
316sil164_encoder_set_property(struct drm_encoder *encoder,
317 struct drm_connector *connector,
318 struct drm_property *property,
319 uint64_t val)
320{
321 return 0;
322}
323
324static void
325sil164_encoder_destroy(struct drm_encoder *encoder)
326{
327 struct sil164_priv *priv = to_sil164_priv(encoder);
328
329 if (priv->duallink_slave)
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_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
406 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
407 if (!priv)
408 return -ENOMEM;
409
410 encoder->slave_priv = priv;
411 encoder->slave_funcs = &sil164_encoder_funcs;
412
413 priv->duallink_slave = sil164_detect_slave(client);
414
415 return 0;
416}
417
418static struct i2c_device_id sil164_ids[] = {
419 { "sil164", 0 },
420 { }
421};
422MODULE_DEVICE_TABLE(i2c, sil164_ids);
423
424static struct drm_i2c_encoder_driver sil164_driver = {
425 .i2c_driver = {
426 .probe = sil164_probe,
427 .remove = sil164_remove,
428 .driver = {
429 .name = "sil164",
430 },
431 .id_table = sil164_ids,
432 },
433 .encoder_init = sil164_encoder_init,
434};
435
436
437
438static int __init
439sil164_init(void)
440{
441 return drm_i2c_encoder_register(THIS_MODULE, &sil164_driver);
442}
443
444static void __exit
445sil164_exit(void)
446{
447 drm_i2c_encoder_unregister(&sil164_driver);
448}
449
450MODULE_AUTHOR("Francisco Jerez <currojerez@riseup.net>");
451MODULE_DESCRIPTION("Silicon Image sil164 TMDS transmitter driver");
452MODULE_LICENSE("GPL and additional rights");
453
454module_init(sil164_init);
455module_exit(sil164_exit);
456
