git.oblomov.eu Git - linux-2.6/blob - drivers/media/video/cx18/cx18-i2c.c

   1 /*
   2  *  cx18 I2C functions
   3  *
   4  *  Derived from ivtv-i2c.c
   5  *
   6  *  Copyright (C) 2007  Hans Verkuil <hverkuil@xs4all.nl>
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  21  *  02111-1307  USA
  22  */
  23
  24 #include "cx18-driver.h"
  25 #include "cx18-cards.h"
  26 #include "cx18-gpio.h"
  27 #include "cx18-av-core.h"
  28 #include "cx18-i2c.h"
  29
  30 #include <media/ir-kbd-i2c.h>
  31
  32 #define CX18_REG_I2C_1_WR   0xf15000
  33 #define CX18_REG_I2C_1_RD   0xf15008
  34 #define CX18_REG_I2C_2_WR   0xf25100
  35 #define CX18_REG_I2C_2_RD   0xf25108
  36
  37 #define SETSCL_BIT      0x0001
  38 #define SETSDL_BIT      0x0002
  39 #define GETSCL_BIT      0x0004
  40 #define GETSDL_BIT      0x0008
  41
  42 #ifndef I2C_ADAP_CLASS_TV_ANALOG
  43 #define I2C_ADAP_CLASS_TV_ANALOG I2C_CLASS_TV_ANALOG
  44 #endif
  45
  46 #define CX18_CS5345_I2C_ADDR            0x4c
  47
  48 /* This array should match the CX18_HW_ defines */
  49 static const u8 hw_driverids[] = {
  50         I2C_DRIVERID_TUNER,
  51         I2C_DRIVERID_TVEEPROM,
  52         I2C_DRIVERID_CS5345,
  53         0,              /* CX18_HW_GPIO dummy driver ID */
  54         0               /* CX18_HW_CX23418 dummy driver ID */
  55 };
  56
  57 /* This array should match the CX18_HW_ defines */
  58 static const u8 hw_addrs[] = {
  59         0,
  60         0,
  61         CX18_CS5345_I2C_ADDR,
  62         0,              /* CX18_HW_GPIO dummy driver ID */
  63         0,              /* CX18_HW_CX23418 dummy driver ID */
  64 };
  65
  66 /* This array should match the CX18_HW_ defines */
  67 /* This might well become a card-specific array */
  68 static const u8 hw_bus[] = {
  69         0,
  70         0,
  71         0,
  72         0,              /* CX18_HW_GPIO dummy driver ID */
  73         0,              /* CX18_HW_CX23418 dummy driver ID */
  74 };
  75
  76 /* This array should match the CX18_HW_ defines */
  77 static const char * const hw_drivernames[] = {
  78         "tuner",
  79         "tveeprom",
  80         "cs5345",
  81         "gpio",
  82         "cx23418",
  83 };
  84
  85 int cx18_i2c_register(struct cx18 *cx, unsigned idx)
  86 {
  87         struct i2c_board_info info;
  88         struct i2c_client *c;
  89         u8 id, bus;
  90         int i;
  91
  92         CX18_DEBUG_I2C("i2c client register\n");
  93         if (idx >= ARRAY_SIZE(hw_driverids) || hw_driverids[idx] == 0)
  94                 return -1;
  95         id = hw_driverids[idx];
  96         bus = hw_bus[idx];
  97         memset(&info, 0, sizeof(info));
  98         strlcpy(info.driver_name, hw_drivernames[idx],
  99                         sizeof(info.driver_name));
 100         info.addr = hw_addrs[idx];
 101         for (i = 0; i < I2C_CLIENTS_MAX; i++)
 102                 if (cx->i2c_clients[i] == NULL)
 103                         break;
 104
 105         if (i == I2C_CLIENTS_MAX) {
 106                 CX18_ERR("insufficient room for new I2C client!\n");
 107                 return -ENOMEM;
 108         }
 109
 110         if (id != I2C_DRIVERID_TUNER) {
 111                 c = i2c_new_device(&cx->i2c_adap[bus], &info);
 112                 if (c->driver == NULL)
 113                         i2c_unregister_device(c);
 114                 else
 115                         cx->i2c_clients[i] = c;
 116                 return cx->i2c_clients[i] ? 0 : -ENODEV;
 117         }
 118
 119         /* special tuner handling */
 120         c = i2c_new_probed_device(&cx->i2c_adap[1], &info, cx->card_i2c->radio);
 121         if (c && c->driver == NULL)
 122                 i2c_unregister_device(c);
 123         else if (c)
 124                 cx->i2c_clients[i++] = c;
 125         c = i2c_new_probed_device(&cx->i2c_adap[1], &info, cx->card_i2c->demod);
 126         if (c && c->driver == NULL)
 127                 i2c_unregister_device(c);
 128         else if (c)
 129                 cx->i2c_clients[i++] = c;
 130         c = i2c_new_probed_device(&cx->i2c_adap[1], &info, cx->card_i2c->tv);
 131         if (c && c->driver == NULL)
 132                 i2c_unregister_device(c);
 133         else if (c)
 134                 cx->i2c_clients[i++] = c;
 135         return 0;
 136 }
 137
 138 static int attach_inform(struct i2c_client *client)
 139 {
 140         return 0;
 141 }
 142
 143 static int detach_inform(struct i2c_client *client)
 144 {
 145         int i;
 146         struct cx18 *cx = (struct cx18 *)i2c_get_adapdata(client->adapter);
 147
 148         CX18_DEBUG_I2C("i2c client detach\n");
 149         for (i = 0; i < I2C_CLIENTS_MAX; i++) {
 150                 if (cx->i2c_clients[i] == client) {
 151                         cx->i2c_clients[i] = NULL;
 152                         break;
 153                 }
 154         }
 155         CX18_DEBUG_I2C("i2c detach [client=%s,%s]\n",
 156                    client->name, (i < I2C_CLIENTS_MAX) ? "ok" : "failed");
 157
 158         return 0;
 159 }
 160
 161 static void cx18_setscl(void *data, int state)
 162 {
 163         struct cx18 *cx = ((struct cx18_i2c_algo_callback_data *)data)->cx;
 164         int bus_index = ((struct cx18_i2c_algo_callback_data *)data)->bus_index;
 165         u32 addr = bus_index ? CX18_REG_I2C_2_WR : CX18_REG_I2C_1_WR;
 166         u32 r = read_reg(addr);
 167
 168         if (state)
 169                 write_reg_sync(r | SETSCL_BIT, addr);
 170         else
 171                 write_reg_sync(r & ~SETSCL_BIT, addr);
 172 }
 173
 174 static void cx18_setsda(void *data, int state)
 175 {
 176         struct cx18 *cx = ((struct cx18_i2c_algo_callback_data *)data)->cx;
 177         int bus_index = ((struct cx18_i2c_algo_callback_data *)data)->bus_index;
 178         u32 addr = bus_index ? CX18_REG_I2C_2_WR : CX18_REG_I2C_1_WR;
 179         u32 r = read_reg(addr);
 180
 181         if (state)
 182                 write_reg_sync(r | SETSDL_BIT, addr);
 183         else
 184                 write_reg_sync(r & ~SETSDL_BIT, addr);
 185 }
 186
 187 static int cx18_getscl(void *data)
 188 {
 189         struct cx18 *cx = ((struct cx18_i2c_algo_callback_data *)data)->cx;
 190         int bus_index = ((struct cx18_i2c_algo_callback_data *)data)->bus_index;
 191         u32 addr = bus_index ? CX18_REG_I2C_2_RD : CX18_REG_I2C_1_RD;
 192
 193         return read_reg(addr) & GETSCL_BIT;
 194 }
 195
 196 static int cx18_getsda(void *data)
 197 {
 198         struct cx18 *cx = ((struct cx18_i2c_algo_callback_data *)data)->cx;
 199         int bus_index = ((struct cx18_i2c_algo_callback_data *)data)->bus_index;
 200         u32 addr = bus_index ? CX18_REG_I2C_2_RD : CX18_REG_I2C_1_RD;
 201
 202         return read_reg(addr) & GETSDL_BIT;
 203 }
 204
 205 /* template for i2c-bit-algo */
 206 static struct i2c_adapter cx18_i2c_adap_template = {
 207         .name = "cx18 i2c driver",
 208         .id = I2C_HW_B_CX2341X,
 209         .algo = NULL,                   /* set by i2c-algo-bit */
 210         .algo_data = NULL,              /* filled from template */
 211         .client_register = attach_inform,
 212         .client_unregister = detach_inform,
 213         .owner = THIS_MODULE,
 214 };
 215
 216 #define CX18_SCL_PERIOD (10) /* usecs. 10 usec is period for a 100 KHz clock */
 217 #define CX18_ALGO_BIT_TIMEOUT (2) /* seconds */
 218
 219 static struct i2c_algo_bit_data cx18_i2c_algo_template = {
 220         .setsda         = cx18_setsda,
 221         .setscl         = cx18_setscl,
 222         .getsda         = cx18_getsda,
 223         .getscl         = cx18_getscl,
 224         .udelay         = CX18_SCL_PERIOD/2,       /* 1/2 clock period in usec*/
 225         .timeout        = CX18_ALGO_BIT_TIMEOUT*HZ /* jiffies */
 226 };
 227
 228 static struct i2c_client cx18_i2c_client_template = {
 229         .name = "cx18 internal",
 230 };
 231
 232 int cx18_call_i2c_client(struct cx18 *cx, int addr, unsigned cmd, void *arg)
 233 {
 234         struct i2c_client *client;
 235         int retval;
 236         int i;
 237
 238         CX18_DEBUG_I2C("call_i2c_client addr=%02x\n", addr);
 239         for (i = 0; i < I2C_CLIENTS_MAX; i++) {
 240                 client = cx->i2c_clients[i];
 241                 if (client == NULL || client->driver == NULL ||
 242                                 client->driver->command == NULL)
 243                         continue;
 244                 if (addr == client->addr) {
 245                         retval = client->driver->command(client, cmd, arg);
 246                         return retval;
 247                 }
 248         }
 249         if (cmd != VIDIOC_G_CHIP_IDENT)
 250                 CX18_ERR("i2c addr 0x%02x not found for cmd 0x%x!\n",
 251                                addr, cmd);
 252         return -ENODEV;
 253 }
 254
 255 /* Find the i2c device based on the driver ID and return
 256    its i2c address or -ENODEV if no matching device was found. */
 257 static int cx18_i2c_id_addr(struct cx18 *cx, u32 id)
 258 {
 259         struct i2c_client *client;
 260         int retval = -ENODEV;
 261         int i;
 262
 263         for (i = 0; i < I2C_CLIENTS_MAX; i++) {
 264                 client = cx->i2c_clients[i];
 265                 if (client == NULL || client->driver == NULL)
 266                         continue;
 267                 if (id == client->driver->id) {
 268                         retval = client->addr;
 269                         break;
 270                 }
 271         }
 272         return retval;
 273 }
 274
 275 /* Find the i2c device name matching the DRIVERID */
 276 static const char *cx18_i2c_id_name(u32 id)
 277 {
 278         int i;
 279
 280         for (i = 0; i < ARRAY_SIZE(hw_driverids); i++)
 281                 if (hw_driverids[i] == id)
 282                         return hw_drivernames[i];
 283         return "unknown device";
 284 }
 285
 286 /* Find the i2c device name matching the CX18_HW_ flag */
 287 static const char *cx18_i2c_hw_name(u32 hw)
 288 {
 289         int i;
 290
 291         for (i = 0; i < ARRAY_SIZE(hw_driverids); i++)
 292                 if (1 << i == hw)
 293                         return hw_drivernames[i];
 294         return "unknown device";
 295 }
 296
 297 /* Find the i2c device matching the CX18_HW_ flag and return
 298    its i2c address or -ENODEV if no matching device was found. */
 299 int cx18_i2c_hw_addr(struct cx18 *cx, u32 hw)
 300 {
 301         int i;
 302
 303         for (i = 0; i < ARRAY_SIZE(hw_driverids); i++)
 304                 if (1 << i == hw)
 305                         return cx18_i2c_id_addr(cx, hw_driverids[i]);
 306         return -ENODEV;
 307 }
 308
 309 /* Calls i2c device based on CX18_HW_ flag. If hw == 0, then do nothing.
 310    If hw == CX18_HW_GPIO then call the gpio handler. */
 311 int cx18_i2c_hw(struct cx18 *cx, u32 hw, unsigned int cmd, void *arg)
 312 {
 313         int addr;
 314
 315         if (hw == CX18_HW_GPIO || hw == 0)
 316                 return 0;
 317         if (hw == CX18_HW_CX23418)
 318                 return cx18_av_cmd(cx, cmd, arg);
 319
 320         addr = cx18_i2c_hw_addr(cx, hw);
 321         if (addr < 0) {
 322                 CX18_ERR("i2c hardware 0x%08x (%s) not found for cmd 0x%x!\n",
 323                                hw, cx18_i2c_hw_name(hw), cmd);
 324                 return addr;
 325         }
 326         return cx18_call_i2c_client(cx, addr, cmd, arg);
 327 }
 328
 329 /* Calls i2c device based on I2C driver ID. */
 330 int cx18_i2c_id(struct cx18 *cx, u32 id, unsigned int cmd, void *arg)
 331 {
 332         int addr;
 333
 334         addr = cx18_i2c_id_addr(cx, id);
 335         if (addr < 0) {
 336                 if (cmd != VIDIOC_G_CHIP_IDENT)
 337                         CX18_ERR("i2c ID 0x%08x (%s) not found for cmd 0x%x!\n",
 338                                 id, cx18_i2c_id_name(id), cmd);
 339                 return addr;
 340         }
 341         return cx18_call_i2c_client(cx, addr, cmd, arg);
 342 }
 343
 344 /* broadcast cmd for all I2C clients and for the gpio subsystem */
 345 void cx18_call_i2c_clients(struct cx18 *cx, unsigned int cmd, void *arg)
 346 {
 347         if (cx->i2c_adap[0].algo == NULL || cx->i2c_adap[1].algo == NULL) {
 348                 CX18_ERR("adapter is not set\n");
 349                 return;
 350         }
 351         cx18_av_cmd(cx, cmd, arg);
 352         i2c_clients_command(&cx->i2c_adap[0], cmd, arg);
 353         i2c_clients_command(&cx->i2c_adap[1], cmd, arg);
 354 }
 355
 356 /* init + register i2c algo-bit adapter */
 357 int init_cx18_i2c(struct cx18 *cx)
 358 {
 359         int i;
 360         CX18_DEBUG_I2C("i2c init\n");
 361
 362         for (i = 0; i < 2; i++) {
 363                 memcpy(&cx->i2c_adap[i], &cx18_i2c_adap_template,
 364                         sizeof(struct i2c_adapter));
 365                 memcpy(&cx->i2c_algo[i], &cx18_i2c_algo_template,
 366                         sizeof(struct i2c_algo_bit_data));
 367                 cx->i2c_algo_cb_data[i].cx = cx;
 368                 cx->i2c_algo_cb_data[i].bus_index = i;
 369                 cx->i2c_algo[i].data = &cx->i2c_algo_cb_data[i];
 370                 cx->i2c_adap[i].algo_data = &cx->i2c_algo[i];
 371
 372                 sprintf(cx->i2c_adap[i].name + strlen(cx->i2c_adap[i].name),
 373                                 " #%d-%d", cx->num, i);
 374                 i2c_set_adapdata(&cx->i2c_adap[i], cx);
 375
 376                 memcpy(&cx->i2c_client[i], &cx18_i2c_client_template,
 377                         sizeof(struct i2c_client));
 378                 sprintf(cx->i2c_client[i].name +
 379                                 strlen(cx->i2c_client[i].name), "%d", i);
 380                 cx->i2c_client[i].adapter = &cx->i2c_adap[i];
 381                 cx->i2c_adap[i].dev.parent = &cx->dev->dev;
 382         }
 383
 384         if (read_reg(CX18_REG_I2C_2_WR) != 0x0003c02f) {
 385                 /* Reset/Unreset I2C hardware block */
 386                 write_reg(0x10000000, 0xc71004); /* Clock select 220MHz */
 387                 write_reg_sync(0x10001000, 0xc71024); /* Clock Enable */
 388         }
 389         /* courtesy of Steven Toth <stoth@hauppauge.com> */
 390         write_reg_sync(0x00c00000, 0xc7001c);
 391         mdelay(10);
 392         write_reg_sync(0x00c000c0, 0xc7001c);
 393         mdelay(10);
 394         write_reg_sync(0x00c00000, 0xc7001c);
 395
 396         write_reg_sync(0x00c00000, 0xc730c8); /* Set to edge-triggered intrs. */
 397         write_reg_sync(0x00c00000, 0xc730c4); /* Clear any stale intrs */
 398
 399         /* Hw I2C1 Clock Freq ~100kHz */
 400         write_reg_sync(0x00021c0f & ~4, CX18_REG_I2C_1_WR);
 401         cx18_setscl(&cx->i2c_algo_cb_data[0], 1);
 402         cx18_setsda(&cx->i2c_algo_cb_data[0], 1);
 403
 404         /* Hw I2C2 Clock Freq ~100kHz */
 405         write_reg_sync(0x00021c0f & ~4, CX18_REG_I2C_2_WR);
 406         cx18_setscl(&cx->i2c_algo_cb_data[1], 1);
 407         cx18_setsda(&cx->i2c_algo_cb_data[1], 1);
 408
 409         return i2c_bit_add_bus(&cx->i2c_adap[0]) ||
 410                 i2c_bit_add_bus(&cx->i2c_adap[1]);
 411 }
 412
 413 void exit_cx18_i2c(struct cx18 *cx)
 414 {
 415         int i;
 416         CX18_DEBUG_I2C("i2c exit\n");
 417         write_reg(read_reg(CX18_REG_I2C_1_WR) | 4, CX18_REG_I2C_1_WR);
 418         write_reg(read_reg(CX18_REG_I2C_2_WR) | 4, CX18_REG_I2C_2_WR);
 419
 420         for (i = 0; i < 2; i++) {
 421                 i2c_del_adapter(&cx->i2c_adap[i]);
 422         }
 423 }
 424
 425 /*
 426    Hauppauge HVR1600 should have:
 427    32 cx24227
 428    98 unknown
 429    a0 eeprom
 430    c2 tuner
 431    e? zilog ir
 432    */