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sii9234_drv.c
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1 /*
2  * Samsung MHL interface driver
3  *
4  * Copyright (C) 2011 Samsung Electronics Co.Ltd
5  * Author: Tomasz Stanislawski <[email protected]>
6  *
7  * This program is free software; you can redistribute it and/or modify it
8  * under the terms of the GNU General Public License as published by the
9  * Free Software Foundation; either version 2 of the License, or (at your
10  * option) any later version.
11  */
12 
13 #include <linux/delay.h>
14 #include <linux/err.h>
15 #include <linux/freezer.h>
16 #include <linux/gpio.h>
17 #include <linux/i2c.h>
18 #include <linux/interrupt.h>
19 #include <linux/irq.h>
20 #include <linux/kthread.h>
21 #include <linux/module.h>
22 #include <linux/pm_runtime.h>
24 #include <linux/slab.h>
25 
26 #include <mach/gpio.h>
27 #include <plat/gpio-cfg.h>
28 
29 #include <media/sii9234.h>
30 #include <media/v4l2-subdev.h>
31 
32 MODULE_AUTHOR("Tomasz Stanislawski <[email protected]>");
33 MODULE_DESCRIPTION("Samsung MHL interface driver");
34 MODULE_LICENSE("GPL");
35 
37  struct i2c_client *client;
38  struct regulator *power;
40  struct v4l2_subdev sd;
41 };
42 
43 static inline struct sii9234_context *sd_to_context(struct v4l2_subdev *sd)
44 {
45  return container_of(sd, struct sii9234_context, sd);
46 }
47 
48 static inline int sii9234_readb(struct i2c_client *client, int addr)
49 {
50  return i2c_smbus_read_byte_data(client, addr);
51 }
52 
53 static inline int sii9234_writeb(struct i2c_client *client, int addr, int value)
54 {
55  return i2c_smbus_write_byte_data(client, addr, value);
56 }
57 
58 static inline int sii9234_writeb_mask(struct i2c_client *client, int addr,
59  int value, int mask)
60 {
61  int ret;
62 
63  ret = i2c_smbus_read_byte_data(client, addr);
64  if (ret < 0)
65  return ret;
66  ret = (ret & ~mask) | (value & mask);
67  return i2c_smbus_write_byte_data(client, addr, ret);
68 }
69 
70 static inline int sii9234_readb_idx(struct i2c_client *client, int addr)
71 {
72  int ret;
73  ret = i2c_smbus_write_byte_data(client, 0xbc, addr >> 8);
74  if (ret < 0)
75  return ret;
76  ret = i2c_smbus_write_byte_data(client, 0xbd, addr & 0xff);
77  if (ret < 0)
78  return ret;
79  return i2c_smbus_read_byte_data(client, 0xbe);
80 }
81 
82 static inline int sii9234_writeb_idx(struct i2c_client *client, int addr,
83  int value)
84 {
85  int ret;
86  ret = i2c_smbus_write_byte_data(client, 0xbc, addr >> 8);
87  if (ret < 0)
88  return ret;
89  ret = i2c_smbus_write_byte_data(client, 0xbd, addr & 0xff);
90  if (ret < 0)
91  return ret;
92  ret = i2c_smbus_write_byte_data(client, 0xbe, value);
93  return ret;
94 }
95 
96 static inline int sii9234_writeb_idx_mask(struct i2c_client *client, int addr,
97  int value, int mask)
98 {
99  int ret;
100 
101  ret = sii9234_readb_idx(client, addr);
102  if (ret < 0)
103  return ret;
104  ret = (ret & ~mask) | (value & mask);
105  return sii9234_writeb_idx(client, addr, ret);
106 }
107 
108 static int sii9234_reset(struct sii9234_context *ctx)
109 {
110  struct i2c_client *client = ctx->client;
111  struct device *dev = &client->dev;
112  int ret, tries;
113 
115  mdelay(1);
117  mdelay(1);
119  mdelay(1);
120 
121  /* going to TTPI mode */
122  ret = sii9234_writeb(client, 0xc7, 0);
123  if (ret < 0) {
124  dev_err(dev, "failed to set TTPI mode\n");
125  return ret;
126  }
127  for (tries = 0; tries < 100 ; ++tries) {
128  ret = sii9234_readb(client, 0x1b);
129  if (ret > 0)
130  break;
131  if (ret < 0) {
132  dev_err(dev, "failed to reset device\n");
133  return -EIO;
134  }
135  mdelay(1);
136  }
137  if (tries == 100) {
138  dev_err(dev, "maximal number of tries reached\n");
139  return -EIO;
140  }
141 
142  return 0;
143 }
144 
145 static int sii9234_verify_version(struct i2c_client *client)
146 {
147  struct device *dev = &client->dev;
148  int family, rev, tpi_rev, dev_id, sub_id, hdcp, id;
149 
150  family = sii9234_readb(client, 0x1b);
151  rev = sii9234_readb(client, 0x1c) & 0x0f;
152  tpi_rev = sii9234_readb(client, 0x1d) & 0x7f;
153  dev_id = sii9234_readb_idx(client, 0x0103);
154  sub_id = sii9234_readb_idx(client, 0x0102);
155  hdcp = sii9234_readb(client, 0x30);
156 
157  if (family < 0 || rev < 0 || tpi_rev < 0 || dev_id < 0 ||
158  sub_id < 0 || hdcp < 0) {
159  dev_err(dev, "failed to read chip's version\n");
160  return -EIO;
161  }
162 
163  id = (dev_id << 8) | sub_id;
164 
165  dev_info(dev, "chip: SiL%02x family: %02x, rev: %02x\n",
166  id, family, rev);
167  dev_info(dev, "tpi_rev:%02x, hdcp: %02x\n", tpi_rev, hdcp);
168  if (id != 0x9234) {
169  dev_err(dev, "not supported chip\n");
170  return -ENODEV;
171  }
172 
173  return 0;
174 }
175 
176 static u8 data[][3] = {
177 /* setup from driver created by doonsoo45.kim */
178  { 0x01, 0x05, 0x04 }, /* Enable Auto soft reset on SCDT = 0 */
179  { 0x01, 0x08, 0x35 }, /* Power Up TMDS Tx Core */
180  { 0x01, 0x0d, 0x1c }, /* HDMI Transcode mode enable */
181  { 0x01, 0x2b, 0x01 }, /* Enable HDCP Compliance workaround */
182  { 0x01, 0x79, 0x40 }, /* daniel test...MHL_INT */
183  { 0x01, 0x80, 0x34 }, /* Enable Rx PLL Clock Value */
184  { 0x01, 0x90, 0x27 }, /* Enable CBUS discovery */
185  { 0x01, 0x91, 0xe5 }, /* Skip RGND detection */
186  { 0x01, 0x92, 0x46 }, /* Force MHD mode */
187  { 0x01, 0x93, 0xdc }, /* Disable CBUS pull-up during RGND measurement */
188  { 0x01, 0x94, 0x66 }, /* 1.8V CBUS VTH & GND threshold */
189  { 0x01, 0x95, 0x31 }, /* RGND block & single discovery attempt */
190  { 0x01, 0x96, 0x22 }, /* use 1K and 2K setting */
191  { 0x01, 0xa0, 0x10 }, /* SIMG: Term mode */
192  { 0x01, 0xa1, 0xfc }, /* Disable internal Mobile HD driver */
193  { 0x01, 0xa3, 0xfa }, /* SIMG: Output Swing default EB, 3x Clk Mult */
194  { 0x01, 0xa5, 0x80 }, /* SIMG: RGND Hysterisis, 3x mode for Beast */
195  { 0x01, 0xa6, 0x0c }, /* SIMG: Swing Offset */
196  { 0x02, 0x3d, 0x3f }, /* Power up CVCC 1.2V core */
197  { 0x03, 0x00, 0x00 }, /* SIMG: correcting HW default */
198  { 0x03, 0x11, 0x01 }, /* Enable TxPLL Clock */
199  { 0x03, 0x12, 0x15 }, /* Enable Tx Clock Path & Equalizer */
200  { 0x03, 0x13, 0x60 }, /* SIMG: Set termination value */
201  { 0x03, 0x14, 0xf0 }, /* SIMG: Change CKDT level */
202  { 0x03, 0x17, 0x07 }, /* SIMG: PLL Calrefsel */
203  { 0x03, 0x1a, 0x20 }, /* VCO Cal */
204  { 0x03, 0x22, 0xe0 }, /* SIMG: Auto EQ */
205  { 0x03, 0x23, 0xc0 }, /* SIMG: Auto EQ */
206  { 0x03, 0x24, 0xa0 }, /* SIMG: Auto EQ */
207  { 0x03, 0x25, 0x80 }, /* SIMG: Auto EQ */
208  { 0x03, 0x26, 0x60 }, /* SIMG: Auto EQ */
209  { 0x03, 0x27, 0x40 }, /* SIMG: Auto EQ */
210  { 0x03, 0x28, 0x20 }, /* SIMG: Auto EQ */
211  { 0x03, 0x29, 0x00 }, /* SIMG: Auto EQ */
212  { 0x03, 0x31, 0x0b }, /* SIMG: Rx PLL BW value from I2C BW ~ 4MHz */
213  { 0x03, 0x45, 0x06 }, /* SIMG: DPLL Mode */
214  { 0x03, 0x4b, 0x06 }, /* SIMG: Correcting HW default */
215  { 0x03, 0x4c, 0xa0 }, /* Manual zone control */
216  { 0x03, 0x4d, 0x02 }, /* SIMG: PLL Mode Value (order is important) */
217 };
218 
219 static int sii9234_set_internal(struct sii9234_context *ctx)
220 {
221  struct i2c_client *client = ctx->client;
222  int i, ret;
223 
224  for (i = 0; i < ARRAY_SIZE(data); ++i) {
225  int addr = (data[i][0] << 8) | data[i][1];
226  ret = sii9234_writeb_idx(client, addr, data[i][2]);
227  if (ret < 0)
228  return ret;
229  }
230  return 0;
231 }
232 
233 static int sii9234_runtime_suspend(struct device *dev)
234 {
235  struct v4l2_subdev *sd = dev_get_drvdata(dev);
236  struct sii9234_context *ctx = sd_to_context(sd);
237  struct i2c_client *client = ctx->client;
238 
239  dev_info(dev, "suspend start\n");
240 
241  sii9234_writeb_mask(client, 0x1e, 3, 3);
242  regulator_disable(ctx->power);
243 
244  return 0;
245 }
246 
247 static int sii9234_runtime_resume(struct device *dev)
248 {
249  struct v4l2_subdev *sd = dev_get_drvdata(dev);
250  struct sii9234_context *ctx = sd_to_context(sd);
251  struct i2c_client *client = ctx->client;
252  int ret;
253 
254  dev_info(dev, "resume start\n");
255  regulator_enable(ctx->power);
256 
257  ret = sii9234_reset(ctx);
258  if (ret)
259  goto fail;
260 
261  /* enable tpi */
262  ret = sii9234_writeb_mask(client, 0x1e, 1, 0);
263  if (ret < 0)
264  goto fail;
265  ret = sii9234_set_internal(ctx);
266  if (ret < 0)
267  goto fail;
268 
269  return 0;
270 
271 fail:
272  dev_err(dev, "failed to resume\n");
273  regulator_disable(ctx->power);
274 
275  return ret;
276 }
277 
278 static const struct dev_pm_ops sii9234_pm_ops = {
279  .runtime_suspend = sii9234_runtime_suspend,
280  .runtime_resume = sii9234_runtime_resume,
281 };
282 
283 static int sii9234_s_power(struct v4l2_subdev *sd, int on)
284 {
285  struct sii9234_context *ctx = sd_to_context(sd);
286  int ret;
287 
288  if (on)
289  ret = pm_runtime_get_sync(&ctx->client->dev);
290  else
291  ret = pm_runtime_put(&ctx->client->dev);
292  /* only values < 0 indicate errors */
293  return IS_ERR_VALUE(ret) ? ret : 0;
294 }
295 
296 static int sii9234_s_stream(struct v4l2_subdev *sd, int enable)
297 {
298  struct sii9234_context *ctx = sd_to_context(sd);
299 
300  /* (dis/en)able TDMS output */
301  sii9234_writeb_mask(ctx->client, 0x1a, enable ? 0 : ~0 , 1 << 4);
302  return 0;
303 }
304 
305 static const struct v4l2_subdev_core_ops sii9234_core_ops = {
306  .s_power = sii9234_s_power,
307 };
308 
309 static const struct v4l2_subdev_video_ops sii9234_video_ops = {
310  .s_stream = sii9234_s_stream,
311 };
312 
313 static const struct v4l2_subdev_ops sii9234_ops = {
314  .core = &sii9234_core_ops,
315  .video = &sii9234_video_ops,
316 };
317 
318 static int __devinit sii9234_probe(struct i2c_client *client,
319  const struct i2c_device_id *id)
320 {
321  struct device *dev = &client->dev;
323  struct sii9234_context *ctx;
324  int ret;
325 
326  ctx = devm_kzalloc(&client->dev, sizeof(*ctx), GFP_KERNEL);
327  if (!ctx) {
328  dev_err(dev, "out of memory\n");
329  ret = -ENOMEM;
330  goto fail;
331  }
332  ctx->client = client;
333 
334  ctx->power = devm_regulator_get(dev, "hdmi-en");
335  if (IS_ERR(ctx->power)) {
336  dev_err(dev, "failed to acquire regulator hdmi-en\n");
337  return PTR_ERR(ctx->power);
338  }
339 
340  ctx->gpio_n_reset = pdata->gpio_n_reset;
341  ret = gpio_request(ctx->gpio_n_reset, "MHL_RST");
342  if (ret) {
343  dev_err(dev, "failed to acquire MHL_RST gpio\n");
344  return ret;
345  }
346 
347  v4l2_i2c_subdev_init(&ctx->sd, client, &sii9234_ops);
348 
349  pm_runtime_enable(dev);
350 
351  /* enable device */
352  ret = pm_runtime_get_sync(dev);
353  if (ret)
354  goto fail_pm;
355 
356  /* verify chip version */
357  ret = sii9234_verify_version(client);
358  if (ret)
359  goto fail_pm_get;
360 
361  /* stop processing */
362  pm_runtime_put(dev);
363 
364  dev_info(dev, "probe successful\n");
365 
366  return 0;
367 
368 fail_pm_get:
369  pm_runtime_put_sync(dev);
370 
371 fail_pm:
372  pm_runtime_disable(dev);
373  gpio_free(ctx->gpio_n_reset);
374 
375 fail:
376  dev_err(dev, "probe failed\n");
377 
378  return ret;
379 }
380 
381 static int __devexit sii9234_remove(struct i2c_client *client)
382 {
383  struct device *dev = &client->dev;
384  struct v4l2_subdev *sd = i2c_get_clientdata(client);
385  struct sii9234_context *ctx = sd_to_context(sd);
386 
387  pm_runtime_disable(dev);
388  gpio_free(ctx->gpio_n_reset);
389 
390  dev_info(dev, "remove successful\n");
391 
392  return 0;
393 }
394 
395 
396 static const struct i2c_device_id sii9234_id[] = {
397  { "SII9234", 0 },
398  { },
399 };
400 
401 MODULE_DEVICE_TABLE(i2c, sii9234_id);
402 static struct i2c_driver sii9234_driver = {
403  .driver = {
404  .name = "sii9234",
405  .owner = THIS_MODULE,
406  .pm = &sii9234_pm_ops,
407  },
408  .probe = sii9234_probe,
409  .remove = __devexit_p(sii9234_remove),
410  .id_table = sii9234_id,
411 };
412 
413 module_i2c_driver(sii9234_driver);