drivers/staging/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 #include <linux/kernel.h>
  22 #include <linux/module.h>
  23 #include <linux/threads.h>
  24 #include <linux/sched.h>
  25 #include <linux/ioport.h>
  26 #include <linux/pci.h>
  27 #include <linux/delay.h>
  28
  29 #include <media/lirc_dev.h>
  30
  31 static int poll_main(void);
  32 static int atir_init_start(void);
  33
  34 static void write_index(unsigned char index, unsigned int value);
  35 static unsigned int read_index(unsigned char index);
  36
  37 static void do_i2c_start(void);
  38 static void do_i2c_stop(void);
  39
  40 static void seems_wr_byte(unsigned char al);
  41 static unsigned char seems_rd_byte(void);
  42
  43 static unsigned int read_index(unsigned char al);
  44 static void write_index(unsigned char ah, unsigned int edx);
  45
  46 static void cycle_delay(int cycle);
  47
  48 static void do_set_bits(unsigned char bl);
  49 static unsigned char do_get_bits(void);
  50
  51 #define DATA_PCI_OFF 0x7FFC00
  52 #define WAIT_CYCLE   20
  53
  54 #define DRIVER_NAME "lirc_bt829"
  55
  56 static int debug;
  57 #define dprintk(fmt, args...)                                            \
  58         do {                                                             \
  59                 if (debug)                                               \
  60                         printk(KERN_DEBUG DRIVER_NAME ": "fmt, ## args); \
  61         } while (0)
  62
  63 static int atir_minor;
  64 static unsigned long pci_addr_phys;
  65 static unsigned char *pci_addr_lin;
  66
  67 static struct lirc_driver atir_driver;
  68
  69 static struct pci_dev *do_pci_probe(void)
  70 {
  71         struct pci_dev *my_dev;
  72         my_dev = pci_get_device(PCI_VENDOR_ID_ATI,
  73                                 PCI_DEVICE_ID_ATI_264VT, NULL);
  74         if (my_dev) {
  75                 printk(KERN_ERR DRIVER_NAME ": Using device: %s\n",
  76                        pci_name(my_dev));
  77                 pci_addr_phys = 0;
  78                 if (my_dev->resource[0].flags & IORESOURCE_MEM) {
  79                         pci_addr_phys = my_dev->resource[0].start;
  80                         printk(KERN_INFO DRIVER_NAME ": memory at 0x%08X\n",
  81                                (unsigned int)pci_addr_phys);
  82                 }
  83                 if (pci_addr_phys == 0) {
  84                         printk(KERN_ERR DRIVER_NAME ": no memory resource ?\n");
  85                         return NULL;
  86                 }
  87         } else {
  88                 printk(KERN_ERR DRIVER_NAME ": pci_probe failed\n");
  89                 return NULL;
  90         }
  91         return my_dev;
  92 }
  93
  94 static int atir_add_to_buf(void *data, struct lirc_buffer *buf)
  95 {
  96         unsigned char key;
  97         int status;
  98         status = poll_main();
  99         key = (status >> 8) & 0xFF;
 100         if (status & 0xFF) {
 101                 dprintk("reading key %02X\n", key);
 102                 lirc_buffer_write(buf, &key);
 103                 return 0;
 104         }
 105         return -ENODATA;
 106 }
 107
 108 static int atir_set_use_inc(void *data)
 109 {
 110         dprintk("driver is opened\n");
 111         return 0;
 112 }
 113
 114 static void atir_set_use_dec(void *data)
 115 {
 116         dprintk("driver is closed\n");
 117 }
 118
 119 int init_module(void)
 120 {
 121         struct pci_dev *pdev;
 122
 123         pdev = do_pci_probe();
 124         if (pdev == NULL)
 125                 return 1;
 126
 127         if (!atir_init_start())
 128                 return 1;
 129
 130         strcpy(atir_driver.name, "ATIR");
 131         atir_driver.minor       = -1;
 132         atir_driver.code_length = 8;
 133         atir_driver.sample_rate = 10;
 134         atir_driver.data        = 0;
 135         atir_driver.add_to_buf  = atir_add_to_buf;
 136         atir_driver.set_use_inc = atir_set_use_inc;
 137         atir_driver.set_use_dec = atir_set_use_dec;
 138         atir_driver.dev         = &pdev->dev;
 139         atir_driver.owner       = THIS_MODULE;
 140
 141         atir_minor = lirc_register_driver(&atir_driver);
 142         if (atir_minor < 0) {
 143                 printk(KERN_ERR DRIVER_NAME ": failed to register driver!\n");
 144                 return atir_minor;
 145         }
 146         dprintk("driver is registered on minor %d\n", atir_minor);
 147
 148         return 0;
 149 }
 150
 151
 152 void cleanup_module(void)
 153 {
 154         lirc_unregister_driver(atir_minor);
 155 }
 156
 157
 158 static int atir_init_start(void)
 159 {
 160         pci_addr_lin = ioremap(pci_addr_phys + DATA_PCI_OFF, 0x400);
 161         if (pci_addr_lin == 0) {
 162                 printk(KERN_INFO DRIVER_NAME ": pci mem must be mapped\n");
 163                 return 0;
 164         }
 165         return 1;
 166 }
 167
 168 static void cycle_delay(int cycle)
 169 {
 170         udelay(WAIT_CYCLE*cycle);
 171 }
 172
 173
 174 static int poll_main()
 175 {
 176         unsigned char status_high, status_low;
 177
 178         do_i2c_start();
 179
 180         seems_wr_byte(0xAA);
 181         seems_wr_byte(0x01);
 182
 183         do_i2c_start();
 184
 185         seems_wr_byte(0xAB);
 186
 187         status_low = seems_rd_byte();
 188         status_high = seems_rd_byte();
 189
 190         do_i2c_stop();
 191
 192         return (status_high << 8) | status_low;
 193 }
 194
 195 static void do_i2c_start(void)
 196 {
 197         do_set_bits(3);
 198         cycle_delay(4);
 199
 200         do_set_bits(1);
 201         cycle_delay(7);
 202
 203         do_set_bits(0);
 204         cycle_delay(2);
 205 }
 206
 207 static void do_i2c_stop(void)
 208 {
 209         unsigned char bits;
 210         bits =  do_get_bits() & 0xFD;
 211         do_set_bits(bits);
 212         cycle_delay(1);
 213
 214         bits |= 1;
 215         do_set_bits(bits);
 216         cycle_delay(2);
 217
 218         bits |= 2;
 219         do_set_bits(bits);
 220         bits = 3;
 221         do_set_bits(bits);
 222         cycle_delay(2);
 223 }
 224
 225 static void seems_wr_byte(unsigned char value)
 226 {
 227         int i;
 228         unsigned char reg;
 229
 230         reg = do_get_bits();
 231         for (i = 0; i < 8; i++) {
 232                 if (value & 0x80)
 233                         reg |= 0x02;
 234                 else
 235                         reg &= 0xFD;
 236
 237                 do_set_bits(reg);
 238                 cycle_delay(1);
 239
 240                 reg |= 1;
 241                 do_set_bits(reg);
 242                 cycle_delay(1);
 243
 244                 reg &= 0xFE;
 245                 do_set_bits(reg);
 246                 cycle_delay(1);
 247                 value <<= 1;
 248         }
 249         cycle_delay(2);
 250
 251         reg |= 2;
 252         do_set_bits(reg);
 253
 254         reg |= 1;
 255         do_set_bits(reg);
 256
 257         cycle_delay(1);
 258         do_get_bits();
 259
 260         reg &= 0xFE;
 261         do_set_bits(reg);
 262         cycle_delay(3);
 263 }
 264
 265 static unsigned char seems_rd_byte(void)
 266 {
 267         int i;
 268         int rd_byte;
 269         unsigned char bits_2, bits_1;
 270
 271         bits_1 = do_get_bits() | 2;
 272         do_set_bits(bits_1);
 273
 274         rd_byte = 0;
 275         for (i = 0; i < 8; i++) {
 276                 bits_1 &= 0xFE;
 277                 do_set_bits(bits_1);
 278                 cycle_delay(2);
 279
 280                 bits_1 |= 1;
 281                 do_set_bits(bits_1);
 282                 cycle_delay(1);
 283
 284                 bits_2 = do_get_bits();
 285                 if (bits_2 & 2)
 286                         rd_byte |= 1;
 287
 288                 rd_byte <<= 1;
 289         }
 290
 291         bits_1 = 0;
 292         if (bits_2 == 0)
 293                 bits_1 |= 2;
 294
 295         do_set_bits(bits_1);
 296         cycle_delay(2);
 297
 298         bits_1 |= 1;
 299         do_set_bits(bits_1);
 300         cycle_delay(3);
 301
 302         bits_1 &= 0xFE;
 303         do_set_bits(bits_1);
 304         cycle_delay(2);
 305
 306         rd_byte >>= 1;
 307         rd_byte &= 0xFF;
 308         return rd_byte;
 309 }
 310
 311 static void do_set_bits(unsigned char new_bits)
 312 {
 313         int reg_val;
 314         reg_val = read_index(0x34);
 315         if (new_bits & 2) {
 316                 reg_val &= 0xFFFFFFDF;
 317                 reg_val |= 1;
 318         } else {
 319                 reg_val &= 0xFFFFFFFE;
 320                 reg_val |= 0x20;
 321         }
 322         reg_val |= 0x10;
 323         write_index(0x34, reg_val);
 324
 325         reg_val = read_index(0x31);
 326         if (new_bits & 1)
 327                 reg_val |= 0x1000000;
 328         else
 329                 reg_val &= 0xFEFFFFFF;
 330
 331         reg_val |= 0x8000000;
 332         write_index(0x31, reg_val);
 333 }
 334
 335 static unsigned char do_get_bits(void)
 336 {
 337         unsigned char bits;
 338         int reg_val;
 339
 340         reg_val = read_index(0x34);
 341         reg_val |= 0x10;
 342         reg_val &= 0xFFFFFFDF;
 343         write_index(0x34, reg_val);
 344
 345         reg_val = read_index(0x34);
 346         bits = 0;
 347         if (reg_val & 8)
 348                 bits |= 2;
 349         else
 350                 bits &= 0xFD;
 351
 352         reg_val = read_index(0x31);
 353         if (reg_val & 0x1000000)
 354                 bits |= 1;
 355         else
 356                 bits &= 0xFE;
 357
 358         return bits;
 359 }
 360
 361 static unsigned int read_index(unsigned char index)
 362 {
 363         unsigned char *addr;
 364         unsigned int value;
 365         /*  addr = pci_addr_lin + DATA_PCI_OFF + ((index & 0xFF) << 2); */
 366         addr = pci_addr_lin + ((index & 0xFF) << 2);
 367         value = readl(addr);
 368         return value;
 369 }
 370
 371 static void write_index(unsigned char index, unsigned int reg_val)
 372 {
 373         unsigned char *addr;
 374         addr = pci_addr_lin + ((index & 0xFF) << 2);
 375         writel(reg_val, addr);
 376 }
 377
 378 MODULE_AUTHOR("Froenchenko Leonid");
 379 MODULE_DESCRIPTION("IR remote driver for bt829 based TV cards");
 380 MODULE_LICENSE("GPL");
 381
 382 module_param(debug, bool, S_IRUGO | S_IWUSR);
 383 MODULE_PARM_DESC(debug, "Debug enabled or not");