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 <media/sii9234.h> 27#include <media/v4l2-subdev.h> 28 29MODULE_AUTHOR("Tomasz Stanislawski <t.stanislaws@samsung.com>"); 30MODULE_DESCRIPTION("Samsung MHL interface driver"); 31MODULE_LICENSE("GPL"); 32 33struct sii9234_context { 34 struct i2c_client *client; 35 struct regulator *power; 36 int gpio_n_reset; 37 struct v4l2_subdev sd; 38}; 39 40static inline struct sii9234_context *sd_to_context(struct v4l2_subdev *sd) 41{ 42 return container_of(sd, struct sii9234_context, sd); 43} 44 45static inline int sii9234_readb(struct i2c_client *client, int addr) 46{ 47 return i2c_smbus_read_byte_data(client, addr); 48} 49 50static 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 55static 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 67static 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 79static 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 93static 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 105static 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 142static 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 173static 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 216static 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 230static 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 244static 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 270fail: 271 dev_err(dev, "failed to resume\n"); 272 regulator_disable(ctx->power); 273 274 return ret; 275} 276 277static const struct dev_pm_ops sii9234_pm_ops = { 278 .runtime_suspend = sii9234_runtime_suspend, 279 .runtime_resume = sii9234_runtime_resume, 280}; 281 282static 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 295static 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 304static const struct v4l2_subdev_core_ops sii9234_core_ops = { 305 .s_power = sii9234_s_power, 306}; 307 308static const struct v4l2_subdev_video_ops sii9234_video_ops = { 309 .s_stream = sii9234_s_stream, 310}; 311 312static const struct v4l2_subdev_ops sii9234_ops = { 313 .core = &sii9234_core_ops, 314 .video = &sii9234_video_ops, 315}; 316 317static 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 367fail_pm_get: 368 pm_runtime_put_sync(dev); 369 370fail_pm: 371 pm_runtime_disable(dev); 372 373fail: 374 dev_err(dev, "probe failed\n"); 375 376 return ret; 377} 378 379static 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 391static const struct i2c_device_id sii9234_id[] = { 392 { "SII9234", 0 }, 393 { }, 394}; 395 396MODULE_DEVICE_TABLE(i2c, sii9234_id); 397static struct i2c_driver sii9234_driver = { 398 .driver = { 399 .name = "sii9234", 400 .owner = THIS_MODULE, 401 .pm = &sii9234_pm_ops, 402 }, 403 .probe = sii9234_probe, 404 .remove = sii9234_remove, 405 .id_table = sii9234_id, 406}; 407 408module_i2c_driver(sii9234_driver); 409