drivers/media/platform/s5p-tv/sii9234_drv.c

   1 /*
   2  * Samsung MHL interface driver
   3  *
   4  * Copyright (C) 2011 Samsung Electronics Co.Ltd
   5  * Author: Tomasz Stanislawski <t.stanislaws@samsung.com>
   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>
  23 #include <linux/regulator/machine.h>
  24 #include <linux/slab.h>
  25
  26 #include <linux/platform_data/media/sii9234.h>
  27 #include <media/v4l2-subdev.h>
  28
  29 MODULE_AUTHOR("Tomasz Stanislawski <t.stanislaws@samsung.com>");
  30 MODULE_DESCRIPTION("Samsung MHL interface driver");
  31 MODULE_LICENSE("GPL");
  32
  33 struct sii9234_context {
  34         struct i2c_client *client;
  35         struct regulator *power;
  36         int gpio_n_reset;
  37         struct v4l2_subdev sd;
  38 };
  39
  40 static inline struct sii9234_context *sd_to_context(struct v4l2_subdev *sd)
  41 {
  42         return container_of(sd, struct sii9234_context, sd);
  43 }
  44
  45 static inline int sii9234_readb(struct i2c_client *client, int addr)
  46 {
  47         return i2c_smbus_read_byte_data(client, addr);
  48 }
  49
  50 static inline int sii9234_writeb(struct i2c_client *client, int addr, int value)
  51 {
  52         return i2c_smbus_write_byte_data(client, addr, value);
  53 }
  54
  55 static inline int sii9234_writeb_mask(struct i2c_client *client, int addr,
  56         int value, int mask)
  57 {
  58         int ret;
  59
  60         ret = i2c_smbus_read_byte_data(client, addr);
  61         if (ret < 0)
  62                 return ret;
  63         ret = (ret & ~mask) | (value & mask);
  64         return i2c_smbus_write_byte_data(client, addr, ret);
  65 }
  66
  67 static inline int sii9234_readb_idx(struct i2c_client *client, int addr)
  68 {
  69         int ret;
  70         ret = i2c_smbus_write_byte_data(client, 0xbc, addr >> 8);
  71         if (ret < 0)
  72                 return ret;
  73         ret = i2c_smbus_write_byte_data(client, 0xbd, addr & 0xff);
  74         if (ret < 0)
  75                 return ret;
  76         return i2c_smbus_read_byte_data(client, 0xbe);
  77 }
  78
  79 static inline int sii9234_writeb_idx(struct i2c_client *client, int addr,
  80         int value)
  81 {
  82         int ret;
  83         ret = i2c_smbus_write_byte_data(client, 0xbc, addr >> 8);
  84         if (ret < 0)
  85                 return ret;
  86         ret = i2c_smbus_write_byte_data(client, 0xbd, addr & 0xff);
  87         if (ret < 0)
  88                 return ret;
  89         ret = i2c_smbus_write_byte_data(client, 0xbe, value);
  90         return ret;
  91 }
  92
  93 static inline int sii9234_writeb_idx_mask(struct i2c_client *client, int addr,
  94         int value, int mask)
  95 {
  96         int ret;
  97
  98         ret = sii9234_readb_idx(client, addr);
  99         if (ret < 0)
 100                 return ret;
 101         ret = (ret & ~mask) | (value & mask);
 102         return sii9234_writeb_idx(client, addr, ret);
 103 }
 104
 105 static int sii9234_reset(struct sii9234_context *ctx)
 106 {
 107         struct i2c_client *client = ctx->client;
 108         struct device *dev = &client->dev;
 109         int ret, tries;
 110
 111         gpio_direction_output(ctx->gpio_n_reset, 1);
 112         mdelay(1);
 113         gpio_direction_output(ctx->gpio_n_reset, 0);
 114         mdelay(1);
 115         gpio_direction_output(ctx->gpio_n_reset, 1);
 116         mdelay(1);
 117
 118         /* going to TTPI mode */
 119         ret = sii9234_writeb(client, 0xc7, 0);
 120         if (ret < 0) {
 121                 dev_err(dev, "failed to set TTPI mode\n");
 122                 return ret;
 123         }
 124         for (tries = 0; tries < 100 ; ++tries) {
 125                 ret = sii9234_readb(client, 0x1b);
 126                 if (ret > 0)
 127                         break;
 128                 if (ret < 0) {
 129                         dev_err(dev, "failed to reset device\n");
 130                         return -EIO;
 131                 }
 132                 mdelay(1);
 133         }
 134         if (tries == 100) {
 135                 dev_err(dev, "maximal number of tries reached\n");
 136                 return -EIO;
 137         }
 138
 139         return 0;
 140 }
 141
 142 static int sii9234_verify_version(struct i2c_client *client)
 143 {
 144         struct device *dev = &client->dev;
 145         int family, rev, tpi_rev, dev_id, sub_id, hdcp, id;
 146
 147         family = sii9234_readb(client, 0x1b);
 148         rev = sii9234_readb(client, 0x1c) & 0x0f;
 149         tpi_rev = sii9234_readb(client, 0x1d) & 0x7f;
 150         dev_id = sii9234_readb_idx(client, 0x0103);
 151         sub_id = sii9234_readb_idx(client, 0x0102);
 152         hdcp = sii9234_readb(client, 0x30);
 153
 154         if (family < 0 || rev < 0 || tpi_rev < 0 || dev_id < 0 ||
 155                 sub_id < 0 || hdcp < 0) {
 156                 dev_err(dev, "failed to read chip's version\n");
 157                 return -EIO;
 158         }
 159
 160         id = (dev_id << 8) | sub_id;
 161
 162         dev_info(dev, "chip: SiL%02x family: %02x, rev: %02x\n",
 163                 id, family, rev);
 164         dev_info(dev, "tpi_rev:%02x, hdcp: %02x\n", tpi_rev, hdcp);
 165         if (id != 0x9234) {
 166                 dev_err(dev, "not supported chip\n");
 167                 return -ENODEV;
 168         }
 169
 170         return 0;
 171 }
 172
 173 static u8 data[][3] = {
 174 /* setup from driver created by doonsoo45.kim */
 175         { 0x01, 0x05, 0x04 }, /* Enable Auto soft reset on SCDT = 0 */
 176         { 0x01, 0x08, 0x35 }, /* Power Up TMDS Tx Core */
 177         { 0x01, 0x0d, 0x1c }, /* HDMI Transcode mode enable */
 178         { 0x01, 0x2b, 0x01 }, /* Enable HDCP Compliance workaround */
 179         { 0x01, 0x79, 0x40 }, /* daniel test...MHL_INT */
 180         { 0x01, 0x80, 0x34 }, /* Enable Rx PLL Clock Value */
 181         { 0x01, 0x90, 0x27 }, /* Enable CBUS discovery */
 182         { 0x01, 0x91, 0xe5 }, /* Skip RGND detection */
 183         { 0x01, 0x92, 0x46 }, /* Force MHD mode */
 184         { 0x01, 0x93, 0xdc }, /* Disable CBUS pull-up during RGND measurement */
 185         { 0x01, 0x94, 0x66 }, /* 1.8V CBUS VTH & GND threshold */
 186         { 0x01, 0x95, 0x31 }, /* RGND block & single discovery attempt */
 187         { 0x01, 0x96, 0x22 }, /* use 1K and 2K setting */
 188         { 0x01, 0xa0, 0x10 }, /* SIMG: Term mode */
 189         { 0x01, 0xa1, 0xfc }, /* Disable internal Mobile HD driver */
 190         { 0x01, 0xa3, 0xfa }, /* SIMG: Output Swing  default EB, 3x Clk Mult */
 191         { 0x01, 0xa5, 0x80 }, /* SIMG: RGND Hysterisis, 3x mode for Beast */
 192         { 0x01, 0xa6, 0x0c }, /* SIMG: Swing Offset */
 193         { 0x02, 0x3d, 0x3f }, /* Power up CVCC 1.2V core */
 194         { 0x03, 0x00, 0x00 }, /* SIMG: correcting HW default */
 195         { 0x03, 0x11, 0x01 }, /* Enable TxPLL Clock */
 196         { 0x03, 0x12, 0x15 }, /* Enable Tx Clock Path & Equalizer */
 197         { 0x03, 0x13, 0x60 }, /* SIMG: Set termination value */
 198         { 0x03, 0x14, 0xf0 }, /* SIMG: Change CKDT level */
 199         { 0x03, 0x17, 0x07 }, /* SIMG: PLL Calrefsel */
 200         { 0x03, 0x1a, 0x20 }, /* VCO Cal */
 201         { 0x03, 0x22, 0xe0 }, /* SIMG: Auto EQ */
 202         { 0x03, 0x23, 0xc0 }, /* SIMG: Auto EQ */
 203         { 0x03, 0x24, 0xa0 }, /* SIMG: Auto EQ */
 204         { 0x03, 0x25, 0x80 }, /* SIMG: Auto EQ */
 205         { 0x03, 0x26, 0x60 }, /* SIMG: Auto EQ */
 206         { 0x03, 0x27, 0x40 }, /* SIMG: Auto EQ */
 207         { 0x03, 0x28, 0x20 }, /* SIMG: Auto EQ */
 208         { 0x03, 0x29, 0x00 }, /* SIMG: Auto EQ */
 209         { 0x03, 0x31, 0x0b }, /* SIMG: Rx PLL BW value from I2C BW ~ 4MHz */
 210         { 0x03, 0x45, 0x06 }, /* SIMG: DPLL Mode */
 211         { 0x03, 0x4b, 0x06 }, /* SIMG: Correcting HW default */
 212         { 0x03, 0x4c, 0xa0 }, /* Manual zone control */
 213         { 0x03, 0x4d, 0x02 }, /* SIMG: PLL Mode Value (order is important) */
 214 };
 215
 216 static int sii9234_set_internal(struct sii9234_context *ctx)
 217 {
 218         struct i2c_client *client = ctx->client;
 219         int i, ret;
 220
 221         for (i = 0; i < ARRAY_SIZE(data); ++i) {
 222                 int addr = (data[i][0] << 8) | data[i][1];
 223                 ret = sii9234_writeb_idx(client, addr, data[i][2]);
 224                 if (ret < 0)
 225                         return ret;
 226         }
 227         return 0;
 228 }
 229
 230 static int sii9234_runtime_suspend(struct device *dev)
 231 {
 232         struct v4l2_subdev *sd = dev_get_drvdata(dev);
 233         struct sii9234_context *ctx = sd_to_context(sd);
 234         struct i2c_client *client = ctx->client;
 235
 236         dev_info(dev, "suspend start\n");
 237
 238         sii9234_writeb_mask(client, 0x1e, 3, 3);
 239         regulator_disable(ctx->power);
 240
 241         return 0;
 242 }
 243
 244 static int sii9234_runtime_resume(struct device *dev)
 245 {
 246         struct v4l2_subdev *sd = dev_get_drvdata(dev);
 247         struct sii9234_context *ctx = sd_to_context(sd);
 248         struct i2c_client *client = ctx->client;
 249         int ret;
 250
 251         dev_info(dev, "resume start\n");
 252         ret = regulator_enable(ctx->power);
 253         if (ret < 0)
 254                 return ret;
 255
 256         ret = sii9234_reset(ctx);
 257         if (ret)
 258                 goto fail;
 259
 260         /* enable tpi */
 261         ret = sii9234_writeb_mask(client, 0x1e, 1, 0);
 262         if (ret < 0)
 263                 goto fail;
 264         ret = sii9234_set_internal(ctx);
 265         if (ret < 0)
 266                 goto fail;
 267
 268         return 0;
 269
 270 fail:
 271         dev_err(dev, "failed to resume\n");
 272         regulator_disable(ctx->power);
 273
 274         return ret;
 275 }
 276
 277 static const struct dev_pm_ops sii9234_pm_ops = {
 278         .runtime_suspend = sii9234_runtime_suspend,
 279         .runtime_resume  = sii9234_runtime_resume,
 280 };
 281
 282 static int sii9234_s_power(struct v4l2_subdev *sd, int on)
 283 {
 284         struct sii9234_context *ctx = sd_to_context(sd);
 285         int ret;
 286
 287         if (on)
 288                 ret = pm_runtime_get_sync(&ctx->client->dev);
 289         else
 290                 ret = pm_runtime_put(&ctx->client->dev);
 291         /* only values < 0 indicate errors */
 292         return ret < 0 ? ret : 0;
 293 }
 294
 295 static int sii9234_s_stream(struct v4l2_subdev *sd, int enable)
 296 {
 297         struct sii9234_context *ctx = sd_to_context(sd);
 298
 299         /* (dis/en)able TDMS output */
 300         sii9234_writeb_mask(ctx->client, 0x1a, enable ? 0 : ~0 , 1 << 4);
 301         return 0;
 302 }
 303
 304 static const struct v4l2_subdev_core_ops sii9234_core_ops = {
 305         .s_power =  sii9234_s_power,
 306 };
 307
 308 static const struct v4l2_subdev_video_ops sii9234_video_ops = {
 309         .s_stream =  sii9234_s_stream,
 310 };
 311
 312 static const struct v4l2_subdev_ops sii9234_ops = {
 313         .core = &sii9234_core_ops,
 314         .video = &sii9234_video_ops,
 315 };
 316
 317 static int sii9234_probe(struct i2c_client *client,
 318                          const struct i2c_device_id *id)
 319 {
 320         struct device *dev = &client->dev;
 321         struct sii9234_platform_data *pdata = dev->platform_data;
 322         struct sii9234_context *ctx;
 323         int ret;
 324
 325         ctx = devm_kzalloc(&client->dev, sizeof(*ctx), GFP_KERNEL);
 326         if (!ctx) {
 327                 dev_err(dev, "out of memory\n");
 328                 ret = -ENOMEM;
 329                 goto fail;
 330         }
 331         ctx->client = client;
 332
 333         ctx->power = devm_regulator_get(dev, "hdmi-en");
 334         if (IS_ERR(ctx->power)) {
 335                 dev_err(dev, "failed to acquire regulator hdmi-en\n");
 336                 return PTR_ERR(ctx->power);
 337         }
 338
 339         ctx->gpio_n_reset = pdata->gpio_n_reset;
 340         ret = devm_gpio_request(dev, ctx->gpio_n_reset, "MHL_RST");
 341         if (ret) {
 342                 dev_err(dev, "failed to acquire MHL_RST gpio\n");
 343                 return ret;
 344         }
 345
 346         v4l2_i2c_subdev_init(&ctx->sd, client, &sii9234_ops);
 347
 348         pm_runtime_enable(dev);
 349
 350         /* enable device */
 351         ret = pm_runtime_get_sync(dev);
 352         if (ret)
 353                 goto fail_pm;
 354
 355         /* verify chip version */
 356         ret = sii9234_verify_version(client);
 357         if (ret)
 358                 goto fail_pm_get;
 359
 360         /* stop processing */
 361         pm_runtime_put(dev);
 362
 363         dev_info(dev, "probe successful\n");
 364
 365         return 0;
 366
 367 fail_pm_get:
 368         pm_runtime_put_sync(dev);
 369
 370 fail_pm:
 371         pm_runtime_disable(dev);
 372
 373 fail:
 374         dev_err(dev, "probe failed\n");
 375
 376         return ret;
 377 }
 378
 379 static int sii9234_remove(struct i2c_client *client)
 380 {
 381         struct device *dev = &client->dev;
 382
 383         pm_runtime_disable(dev);
 384
 385         dev_info(dev, "remove successful\n");
 386
 387         return 0;
 388 }
 389
 390
 391 static const struct i2c_device_id sii9234_id[] = {
 392         { "SII9234", 0 },
 393         { },
 394 };
 395
 396 MODULE_DEVICE_TABLE(i2c, sii9234_id);
 397 static struct i2c_driver sii9234_driver = {
 398         .driver = {
 399                 .name   = "sii9234",
 400                 .pm = &sii9234_pm_ops,
 401         },
 402         .probe          = sii9234_probe,
 403         .remove         = sii9234_remove,
 404         .id_table = sii9234_id,
 405 };
 406
 407 module_i2c_driver(sii9234_driver);