drivers/staging/media/lirc/lirc_bt829.c

   1 /*
   2  * Remote control driver for the TV-card based on bt829
   3  *
   4  *  by Leonid Froenchenko <lfroen@galileo.co.il>
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19 */
  20
  21 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  22
  23 #include <linux/kernel.h>
  24 #include <linux/module.h>
  25 #include <linux/threads.h>
  26 #include <linux/sched.h>
  27 #include <linux/ioport.h>
  28 #include <linux/pci.h>
  29 #include <linux/delay.h>
  30
  31 #include <media/lirc_dev.h>
  32
  33 static int poll_main(void);
  34 static int atir_init_start(void);
  35
  36 static void write_index(unsigned char index, unsigned int value);
  37 static unsigned int read_index(unsigned char index);
  38
  39 static void do_i2c_start(void);
  40 static void do_i2c_stop(void);
  41
  42 static void seems_wr_byte(unsigned char al);
  43 static unsigned char seems_rd_byte(void);
  44
  45 static unsigned int read_index(unsigned char al);
  46 static void write_index(unsigned char ah, unsigned int edx);
  47
  48 static void cycle_delay(int cycle);
  49
  50 static void do_set_bits(unsigned char bl);
  51 static unsigned char do_get_bits(void);
  52
  53 #define DATA_PCI_OFF 0x7FFC00
  54 #define WAIT_CYCLE   20
  55
  56 #define DRIVER_NAME "lirc_bt829"
  57
  58 static bool debug;
  59 #define dprintk(fmt, args...)                                            \
  60         do {                                                             \
  61                 if (debug)                                               \
  62                         printk(KERN_DEBUG DRIVER_NAME ": "fmt, ## args); \
  63         } while (0)
  64
  65 static int atir_minor;
  66 static phys_addr_t pci_addr_phys;
  67 static unsigned char *pci_addr_lin;
  68
  69 static struct lirc_driver atir_driver;
  70
  71 static struct pci_dev *do_pci_probe(void)
  72 {
  73         struct pci_dev *my_dev;
  74         my_dev = pci_get_device(PCI_VENDOR_ID_ATI,
  75                                 PCI_DEVICE_ID_ATI_264VT, NULL);
  76         if (my_dev) {
  77                 pr_err("Using device: %s\n", pci_name(my_dev));
  78                 pci_addr_phys = 0;
  79                 if (my_dev->resource[0].flags & IORESOURCE_MEM) {
  80                         pci_addr_phys = my_dev->resource[0].start;
  81                         pr_info("memory at %pa\n", &pci_addr_phys);
  82                 }
  83                 if (pci_addr_phys == 0) {
  84                         pr_err("no memory resource ?\n");
  85                         pci_dev_put(my_dev);
  86                         return NULL;
  87                 }
  88         } else {
  89                 pr_err("pci_probe failed\n");
  90                 return NULL;
  91         }
  92         return my_dev;
  93 }
  94
  95 static int atir_add_to_buf(void *data, struct lirc_buffer *buf)
  96 {
  97         unsigned char key;
  98         int status;
  99         status = poll_main();
 100         key = (status >> 8) & 0xFF;
 101         if (status & 0xFF) {
 102                 dprintk("reading key %02X\n", key);
 103                 lirc_buffer_write(buf, &key);
 104                 return 0;
 105         }
 106         return -ENODATA;
 107 }
 108
 109 static int atir_set_use_inc(void *data)
 110 {
 111         dprintk("driver is opened\n");
 112         return 0;
 113 }
 114
 115 static void atir_set_use_dec(void *data)
 116 {
 117         dprintk("driver is closed\n");
 118 }
 119
 120 int init_module(void)
 121 {
 122         struct pci_dev *pdev;
 123         int rc;
 124
 125         pdev = do_pci_probe();
 126         if (pdev == NULL)
 127                 return -ENODEV;
 128
 129         rc = pci_enable_device(pdev);
 130         if (rc)
 131                 goto err_put_dev;
 132
 133         if (!atir_init_start()) {
 134                 rc = -ENODEV;
 135                 goto err_disable;
 136         }
 137
 138         strcpy(atir_driver.name, "ATIR");
 139         atir_driver.minor       = -1;
 140         atir_driver.code_length = 8;
 141         atir_driver.sample_rate = 10;
 142         atir_driver.data        = NULL;
 143         atir_driver.add_to_buf  = atir_add_to_buf;
 144         atir_driver.set_use_inc = atir_set_use_inc;
 145         atir_driver.set_use_dec = atir_set_use_dec;
 146         atir_driver.dev         = &pdev->dev;
 147         atir_driver.owner       = THIS_MODULE;
 148
 149         atir_minor = lirc_register_driver(&atir_driver);
 150         if (atir_minor < 0) {
 151                 pr_err("failed to register driver!\n");
 152                 rc = atir_minor;
 153                 goto err_unmap;
 154         }
 155         dprintk("driver is registered on minor %d\n", atir_minor);
 156
 157         return 0;
 158
 159 err_unmap:
 160         iounmap(pci_addr_lin);
 161 err_disable:
 162         pci_disable_device(pdev);
 163 err_put_dev:
 164         pci_dev_put(pdev);
 165         return rc;
 166 }
 167
 168
 169 void cleanup_module(void)
 170 {
 171         struct pci_dev *pdev = to_pci_dev(atir_driver.dev);
 172
 173         lirc_unregister_driver(atir_minor);
 174         iounmap(pci_addr_lin);
 175         pci_disable_device(pdev);
 176         pci_dev_put(pdev);
 177 }
 178
 179
 180 static int atir_init_start(void)
 181 {
 182         pci_addr_lin = ioremap(pci_addr_phys + DATA_PCI_OFF, 0x400);
 183         if (!pci_addr_lin) {
 184                 pr_info("pci mem must be mapped\n");
 185                 return 0;
 186         }
 187         return 1;
 188 }
 189
 190 static void cycle_delay(int cycle)
 191 {
 192         udelay(WAIT_CYCLE*cycle);
 193 }
 194
 195
 196 static int poll_main(void)
 197 {
 198         unsigned char status_high, status_low;
 199
 200         do_i2c_start();
 201
 202         seems_wr_byte(0xAA);
 203         seems_wr_byte(0x01);
 204
 205         do_i2c_start();
 206
 207         seems_wr_byte(0xAB);
 208
 209         status_low = seems_rd_byte();
 210         status_high = seems_rd_byte();
 211
 212         do_i2c_stop();
 213
 214         return (status_high << 8) | status_low;
 215 }
 216
 217 static void do_i2c_start(void)
 218 {
 219         do_set_bits(3);
 220         cycle_delay(4);
 221
 222         do_set_bits(1);
 223         cycle_delay(7);
 224
 225         do_set_bits(0);
 226         cycle_delay(2);
 227 }
 228
 229 static void do_i2c_stop(void)
 230 {
 231         unsigned char bits;
 232         bits =  do_get_bits() & 0xFD;
 233         do_set_bits(bits);
 234         cycle_delay(1);
 235
 236         bits |= 1;
 237         do_set_bits(bits);
 238         cycle_delay(2);
 239
 240         bits |= 2;
 241         do_set_bits(bits);
 242         bits = 3;
 243         do_set_bits(bits);
 244         cycle_delay(2);
 245 }
 246
 247 static void seems_wr_byte(unsigned char value)
 248 {
 249         int i;
 250         unsigned char reg;
 251
 252         reg = do_get_bits();
 253         for (i = 0; i < 8; i++) {
 254                 if (value & 0x80)
 255                         reg |= 0x02;
 256                 else
 257                         reg &= 0xFD;
 258
 259                 do_set_bits(reg);
 260                 cycle_delay(1);
 261
 262                 reg |= 1;
 263                 do_set_bits(reg);
 264                 cycle_delay(1);
 265
 266                 reg &= 0xFE;
 267                 do_set_bits(reg);
 268                 cycle_delay(1);
 269                 value <<= 1;
 270         }
 271         cycle_delay(2);
 272
 273         reg |= 2;
 274         do_set_bits(reg);
 275
 276         reg |= 1;
 277         do_set_bits(reg);
 278
 279         cycle_delay(1);
 280         do_get_bits();
 281
 282         reg &= 0xFE;
 283         do_set_bits(reg);
 284         cycle_delay(3);
 285 }
 286
 287 static unsigned char seems_rd_byte(void)
 288 {
 289         int i;
 290         int rd_byte;
 291         unsigned char bits_2, bits_1;
 292
 293         bits_1 = do_get_bits() | 2;
 294         do_set_bits(bits_1);
 295
 296         rd_byte = 0;
 297         for (i = 0; i < 8; i++) {
 298                 bits_1 &= 0xFE;
 299                 do_set_bits(bits_1);
 300                 cycle_delay(2);
 301
 302                 bits_1 |= 1;
 303                 do_set_bits(bits_1);
 304                 cycle_delay(1);
 305
 306                 bits_2 = do_get_bits();
 307                 if (bits_2 & 2)
 308                         rd_byte |= 1;
 309
 310                 rd_byte <<= 1;
 311         }
 312
 313         bits_1 = 0;
 314         if (bits_2 == 0)
 315                 bits_1 |= 2;
 316
 317         do_set_bits(bits_1);
 318         cycle_delay(2);
 319
 320         bits_1 |= 1;
 321         do_set_bits(bits_1);
 322         cycle_delay(3);
 323
 324         bits_1 &= 0xFE;
 325         do_set_bits(bits_1);
 326         cycle_delay(2);
 327
 328         rd_byte >>= 1;
 329         rd_byte &= 0xFF;
 330         return rd_byte;
 331 }
 332
 333 static void do_set_bits(unsigned char new_bits)
 334 {
 335         int reg_val;
 336         reg_val = read_index(0x34);
 337         if (new_bits & 2) {
 338                 reg_val &= 0xFFFFFFDF;
 339                 reg_val |= 1;
 340         } else {
 341                 reg_val &= 0xFFFFFFFE;
 342                 reg_val |= 0x20;
 343         }
 344         reg_val |= 0x10;
 345         write_index(0x34, reg_val);
 346
 347         reg_val = read_index(0x31);
 348         if (new_bits & 1)
 349                 reg_val |= 0x1000000;
 350         else
 351                 reg_val &= 0xFEFFFFFF;
 352
 353         reg_val |= 0x8000000;
 354         write_index(0x31, reg_val);
 355 }
 356
 357 static unsigned char do_get_bits(void)
 358 {
 359         unsigned char bits;
 360         int reg_val;
 361
 362         reg_val = read_index(0x34);
 363         reg_val |= 0x10;
 364         reg_val &= 0xFFFFFFDF;
 365         write_index(0x34, reg_val);
 366
 367         reg_val = read_index(0x34);
 368         bits = 0;
 369         if (reg_val & 8)
 370                 bits |= 2;
 371         else
 372                 bits &= 0xFD;
 373
 374         reg_val = read_index(0x31);
 375         if (reg_val & 0x1000000)
 376                 bits |= 1;
 377         else
 378                 bits &= 0xFE;
 379
 380         return bits;
 381 }
 382
 383 static unsigned int read_index(unsigned char index)
 384 {
 385         unsigned char *addr;
 386         unsigned int value;
 387         /*  addr = pci_addr_lin + DATA_PCI_OFF + ((index & 0xFF) << 2); */
 388         addr = pci_addr_lin + ((index & 0xFF) << 2);
 389         value = readl(addr);
 390         return value;
 391 }
 392
 393 static void write_index(unsigned char index, unsigned int reg_val)
 394 {
 395         unsigned char *addr;
 396         addr = pci_addr_lin + ((index & 0xFF) << 2);
 397         writel(reg_val, addr);
 398 }
 399
 400 MODULE_AUTHOR("Froenchenko Leonid");
 401 MODULE_DESCRIPTION("IR remote driver for bt829 based TV cards");
 402 MODULE_LICENSE("GPL");
 403
 404 module_param(debug, bool, S_IRUGO | S_IWUSR);
 405 MODULE_PARM_DESC(debug, "Debug enabled or not");