2 * Samsung MHL interface driver
4 * Copyright (C) 2011 Samsung Electronics Co.Ltd
5 * Author: Tomasz Stanislawski <t.stanislaws@samsung.com>
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.
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>
23 #include <linux/regulator/machine.h>
24 #include <linux/slab.h>
26 #include <mach/gpio.h>
27 #include <plat/gpio-cfg.h>
29 #include <media/sii9234.h>
30 #include <media/v4l2-subdev.h>
32 MODULE_AUTHOR("Tomasz Stanislawski <t.stanislaws@samsung.com>");
33 MODULE_DESCRIPTION("Samsung MHL interface driver");
34 MODULE_LICENSE("GPL");
36 struct sii9234_context {
37 struct i2c_client *client;
38 struct regulator *power;
40 struct v4l2_subdev sd;
43 static inline struct sii9234_context *sd_to_context(struct v4l2_subdev *sd)
45 return container_of(sd, struct sii9234_context, sd);
48 static inline int sii9234_readb(struct i2c_client *client, int addr)
50 return i2c_smbus_read_byte_data(client, addr);
53 static inline int sii9234_writeb(struct i2c_client *client, int addr, int value)
55 return i2c_smbus_write_byte_data(client, addr, value);
58 static inline int sii9234_writeb_mask(struct i2c_client *client, int addr,
63 ret = i2c_smbus_read_byte_data(client, addr);
66 ret = (ret & ~mask) | (value & mask);
67 return i2c_smbus_write_byte_data(client, addr, ret);
70 static inline int sii9234_readb_idx(struct i2c_client *client, int addr)
73 ret = i2c_smbus_write_byte_data(client, 0xbc, addr >> 8);
76 ret = i2c_smbus_write_byte_data(client, 0xbd, addr & 0xff);
79 return i2c_smbus_read_byte_data(client, 0xbe);
82 static inline int sii9234_writeb_idx(struct i2c_client *client, int addr,
86 ret = i2c_smbus_write_byte_data(client, 0xbc, addr >> 8);
89 ret = i2c_smbus_write_byte_data(client, 0xbd, addr & 0xff);
92 ret = i2c_smbus_write_byte_data(client, 0xbe, value);
96 static inline int sii9234_writeb_idx_mask(struct i2c_client *client, int addr,
101 ret = sii9234_readb_idx(client, addr);
104 ret = (ret & ~mask) | (value & mask);
105 return sii9234_writeb_idx(client, addr, ret);
108 static int sii9234_reset(struct sii9234_context *ctx)
110 struct i2c_client *client = ctx->client;
111 struct device *dev = &client->dev;
114 gpio_direction_output(ctx->gpio_n_reset, 1);
116 gpio_direction_output(ctx->gpio_n_reset, 0);
118 gpio_direction_output(ctx->gpio_n_reset, 1);
121 /* going to TTPI mode */
122 ret = sii9234_writeb(client, 0xc7, 0);
124 dev_err(dev, "failed to set TTPI mode\n");
127 for (tries = 0; tries < 100 ; ++tries) {
128 ret = sii9234_readb(client, 0x1b);
132 dev_err(dev, "failed to reset device\n");
138 dev_err(dev, "maximal number of tries reached\n");
145 static int sii9234_verify_version(struct i2c_client *client)
147 struct device *dev = &client->dev;
148 int family, rev, tpi_rev, dev_id, sub_id, hdcp, id;
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);
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");
163 id = (dev_id << 8) | sub_id;
165 dev_info(dev, "chip: SiL%02x family: %02x, rev: %02x\n",
167 dev_info(dev, "tpi_rev:%02x, hdcp: %02x\n", tpi_rev, hdcp);
169 dev_err(dev, "not supported chip\n");
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) */
219 static int sii9234_set_internal(struct sii9234_context *ctx)
221 struct i2c_client *client = ctx->client;
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]);
233 static int sii9234_runtime_suspend(struct device *dev)
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;
239 dev_info(dev, "suspend start\n");
241 sii9234_writeb_mask(client, 0x1e, 3, 3);
242 regulator_disable(ctx->power);
247 static int sii9234_runtime_resume(struct device *dev)
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;
254 dev_info(dev, "resume start\n");
255 regulator_enable(ctx->power);
257 ret = sii9234_reset(ctx);
262 ret = sii9234_writeb_mask(client, 0x1e, 1, 0);
265 ret = sii9234_set_internal(ctx);
272 dev_err(dev, "failed to resume\n");
273 regulator_disable(ctx->power);
278 static const struct dev_pm_ops sii9234_pm_ops = {
279 .runtime_suspend = sii9234_runtime_suspend,
280 .runtime_resume = sii9234_runtime_resume,
283 static int sii9234_s_power(struct v4l2_subdev *sd, int on)
285 struct sii9234_context *ctx = sd_to_context(sd);
289 ret = pm_runtime_get_sync(&ctx->client->dev);
291 ret = pm_runtime_put(&ctx->client->dev);
292 /* only values < 0 indicate errors */
293 return IS_ERR_VALUE(ret) ? ret : 0;
296 static int sii9234_s_stream(struct v4l2_subdev *sd, int enable)
298 struct sii9234_context *ctx = sd_to_context(sd);
300 /* (dis/en)able TDMS output */
301 sii9234_writeb_mask(ctx->client, 0x1a, enable ? 0 : ~0 , 1 << 4);
305 static const struct v4l2_subdev_core_ops sii9234_core_ops = {
306 .s_power = sii9234_s_power,
309 static const struct v4l2_subdev_video_ops sii9234_video_ops = {
310 .s_stream = sii9234_s_stream,
313 static const struct v4l2_subdev_ops sii9234_ops = {
314 .core = &sii9234_core_ops,
315 .video = &sii9234_video_ops,
318 static int __devinit sii9234_probe(struct i2c_client *client,
319 const struct i2c_device_id *id)
321 struct device *dev = &client->dev;
322 struct sii9234_platform_data *pdata = dev->platform_data;
323 struct sii9234_context *ctx;
326 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
328 dev_err(dev, "out of memory\n");
332 ctx->client = client;
334 ctx->power = regulator_get(dev, "hdmi-en");
335 if (IS_ERR(ctx->power)) {
336 dev_err(dev, "failed to acquire regulator hdmi-en\n");
337 ret = PTR_ERR(ctx->power);
341 ctx->gpio_n_reset = pdata->gpio_n_reset;
342 ret = gpio_request(ctx->gpio_n_reset, "MHL_RST");
344 dev_err(dev, "failed to acquire MHL_RST gpio\n");
348 v4l2_i2c_subdev_init(&ctx->sd, client, &sii9234_ops);
350 pm_runtime_enable(dev);
353 ret = pm_runtime_get_sync(dev);
357 /* verify chip version */
358 ret = sii9234_verify_version(client);
362 /* stop processing */
365 dev_info(dev, "probe successful\n");
370 pm_runtime_put_sync(dev);
373 pm_runtime_disable(dev);
374 gpio_free(ctx->gpio_n_reset);
377 regulator_put(ctx->power);
383 dev_err(dev, "probe failed\n");
388 static int __devexit sii9234_remove(struct i2c_client *client)
390 struct device *dev = &client->dev;
391 struct v4l2_subdev *sd = i2c_get_clientdata(client);
392 struct sii9234_context *ctx = sd_to_context(sd);
394 pm_runtime_disable(dev);
395 gpio_free(ctx->gpio_n_reset);
396 regulator_put(ctx->power);
399 dev_info(dev, "remove successful\n");
405 static const struct i2c_device_id sii9234_id[] = {
410 MODULE_DEVICE_TABLE(i2c, sii9234_id);
411 static struct i2c_driver sii9234_driver = {
414 .owner = THIS_MODULE,
415 .pm = &sii9234_pm_ops,
417 .probe = sii9234_probe,
418 .remove = __devexit_p(sii9234_remove),
419 .id_table = sii9234_id,
422 module_i2c_driver(sii9234_driver);