Jarod Wilson | d10d634 | 2010-07-26 20:26:53 -0300 | [diff] [blame] | 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; |
Mauro Carvalho Chehab | 0f9313a | 2010-07-27 18:44:45 -0300 | [diff] [blame^] | 80 | printk(KERN_INFO DRIVER_NAME ": memory at 0x%08X\n", |
Jarod Wilson | d10d634 | 2010-07-26 20:26:53 -0300 | [diff] [blame] | 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"); |