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_devicenames[] = {
  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.type, hw_devicenames[idx], sizeof(info.type));
  99         info.addr = hw_addrs[idx];
 100         for (i = 0; i < I2C_CLIENTS_MAX; i++)
 101                 if (cx->i2c_clients[i] == NULL)
 102                         break;
 103
 104         if (i == I2C_CLIENTS_MAX) {
 105                 CX18_ERR("insufficient room for new I2C client!\n");
 106                 return -ENOMEM;
 107         }
 108
 109         if (id != I2C_DRIVERID_TUNER) {
 110                 c = i2c_new_device(&cx->i2c_adap[bus], &info);
 111                 if (c->driver == NULL)
 112                         i2c_unregister_device(c);
 113                 else
 114                         cx->i2c_clients[i] = c;
 115                 return cx->i2c_clients[i] ? 0 : -ENODEV;
 116         }
 117
 118         /* special tuner handling */
 119         c = i2c_new_probed_device(&cx->i2c_adap[1], &info, cx->card_i2c->radio);
 120         if (c && c->driver == NULL)
 121                 i2c_unregister_device(c);
 122         else if (c)
 123                 cx->i2c_clients[i++] = c;
 124         c = i2c_new_probed_device(&cx->i2c_adap[1], &info, cx->card_i2c->demod);
 125         if (c && c->driver == NULL)
 126                 i2c_unregister_device(c);
 127         else if (c)
 128                 cx->i2c_clients[i++] = c;
 129         c = i2c_new_probed_device(&cx->i2c_adap[1], &info, cx->card_i2c->tv);
 130         if (c && c->driver == NULL)
 131                 i2c_unregister_device(c);
 132         else if (c)
 133                 cx->i2c_clients[i++] = c;
 134         return 0;
 135 }
 136
 137 static int attach_inform(struct i2c_client *client)
 138 {
 139         return 0;
 140 }
 141
 142 static int detach_inform(struct i2c_client *client)
 143 {
 144         int i;
 145         struct cx18 *cx = (struct cx18 *)i2c_get_adapdata(client->adapter);
 146
 147         CX18_DEBUG_I2C("i2c client detach\n");
 148         for (i = 0; i < I2C_CLIENTS_MAX; i++) {
 149                 if (cx->i2c_clients[i] == client) {
 150                         cx->i2c_clients[i] = NULL;
 151                         break;
 152                 }
 153         }
 154         CX18_DEBUG_I2C("i2c detach [client=%s,%s]\n",
 155                    client->name, (i < I2C_CLIENTS_MAX) ? "ok" : "failed");
 156
 157         return 0;
 158 }
 159
 160 static void cx18_setscl(void *data, int state)
 161 {
 162         struct cx18 *cx = ((struct cx18_i2c_algo_callback_data *)data)->cx;
 163         int bus_index = ((struct cx18_i2c_algo_callback_data *)data)->bus_index;
 164         u32 addr = bus_index ? CX18_REG_I2C_2_WR : CX18_REG_I2C_1_WR;
 165         u32 r = read_reg(addr);
 166
 167         if (state)
 168                 write_reg_sync(r | SETSCL_BIT, addr);
 169         else
 170                 write_reg_sync(r & ~SETSCL_BIT, addr);
 171 }
 172
 173 static void cx18_setsda(void *data, int state)
 174 {
 175         struct cx18 *cx = ((struct cx18_i2c_algo_callback_data *)data)->cx;
 176         int bus_index = ((struct cx18_i2c_algo_callback_data *)data)->bus_index;
 177         u32 addr = bus_index ? CX18_REG_I2C_2_WR : CX18_REG_I2C_1_WR;
 178         u32 r = read_reg(addr);
 179
 180         if (state)
 181                 write_reg_sync(r | SETSDL_BIT, addr);
 182         else
 183                 write_reg_sync(r & ~SETSDL_BIT, addr);
 184 }
 185
 186 static int cx18_getscl(void *data)
 187 {
 188         struct cx18 *cx = ((struct cx18_i2c_algo_callback_data *)data)->cx;
 189         int bus_index = ((struct cx18_i2c_algo_callback_data *)data)->bus_index;
 190         u32 addr = bus_index ? CX18_REG_I2C_2_RD : CX18_REG_I2C_1_RD;
 191
 192         return read_reg(addr) & GETSCL_BIT;
 193 }
 194
 195 static int cx18_getsda(void *data)
 196 {
 197         struct cx18 *cx = ((struct cx18_i2c_algo_callback_data *)data)->cx;
 198         int bus_index = ((struct cx18_i2c_algo_callback_data *)data)->bus_index;
 199         u32 addr = bus_index ? CX18_REG_I2C_2_RD : CX18_REG_I2C_1_RD;
 200
 201         return read_reg(addr) & GETSDL_BIT;
 202 }
 203
 204 /* template for i2c-bit-algo */
 205 static struct i2c_adapter cx18_i2c_adap_template = {
 206         .name = "cx18 i2c driver",
 207         .id = I2C_HW_B_CX2341X,
 208         .algo = NULL,                   /* set by i2c-algo-bit */
 209         .algo_data = NULL,              /* filled from template */
 210         .client_register = attach_inform,
 211         .client_unregister = detach_inform,
 212         .owner = THIS_MODULE,
 213 };
 214
 215 #define CX18_SCL_PERIOD (10) /* usecs. 10 usec is period for a 100 KHz clock */
 216 #define CX18_ALGO_BIT_TIMEOUT (2) /* seconds */
 217
 218 static struct i2c_algo_bit_data cx18_i2c_algo_template = {
 219         .setsda         = cx18_setsda,
 220         .setscl         = cx18_setscl,
 221         .getsda         = cx18_getsda,
 222         .getscl         = cx18_getscl,
 223         .udelay         = CX18_SCL_PERIOD/2,       /* 1/2 clock period in usec*/
 224         .timeout        = CX18_ALGO_BIT_TIMEOUT*HZ /* jiffies */
 225 };
 226
 227 static struct i2c_client cx18_i2c_client_template = {
 228         .name = "cx18 internal",
 229 };
 230
 231 int cx18_call_i2c_client(struct cx18 *cx, int addr, unsigned cmd, void *arg)
 232 {
 233         struct i2c_client *client;
 234         int retval;
 235         int i;
 236
 237         CX18_DEBUG_I2C("call_i2c_client addr=%02x\n", addr);
 238         for (i = 0; i < I2C_CLIENTS_MAX; i++) {
 239                 client = cx->i2c_clients[i];
 240                 if (client == NULL || client->driver == NULL ||
 241                                 client->driver->command == NULL)
 242                         continue;
 243                 if (addr == client->addr) {
 244                         retval = client->driver->command(client, cmd, arg);
 245                         return retval;
 246                 }
 247         }
 248         if (cmd != VIDIOC_G_CHIP_IDENT)
 249                 CX18_ERR("i2c addr 0x%02x not found for cmd 0x%x!\n",
 250                                addr, cmd);
 251         return -ENODEV;
 252 }
 253
 254 /* Find the i2c device based on the driver ID and return
 255    its i2c address or -ENODEV if no matching device was found. */
 256 static int cx18_i2c_id_addr(struct cx18 *cx, u32 id)
 257 {
 258         struct i2c_client *client;
 259         int retval = -ENODEV;
 260         int i;
 261
 262         for (i = 0; i < I2C_CLIENTS_MAX; i++) {
 263                 client = cx->i2c_clients[i];
 264                 if (client == NULL || client->driver == NULL)
 265                         continue;
 266                 if (id == client->driver->id) {
 267                         retval = client->addr;
 268                         break;
 269                 }
 270         }
 271         return retval;
 272 }
 273
 274 /* Find the i2c device name matching the DRIVERID */
 275 static const char *cx18_i2c_id_name(u32 id)
 276 {
 277         int i;
 278
 279         for (i = 0; i < ARRAY_SIZE(hw_driverids); i++)
 280                 if (hw_driverids[i] == id)
 281                         return hw_devicenames[i];
 282         return "unknown device";
 283 }
 284
 285 /* Find the i2c device name matching the CX18_HW_ flag */
 286 static const char *cx18_i2c_hw_name(u32 hw)
 287 {
 288         int i;
 289
 290         for (i = 0; i < ARRAY_SIZE(hw_driverids); i++)
 291                 if (1 << i == hw)
 292                         return hw_devicenames[i];
 293         return "unknown device";
 294 }
 295
 296 /* Find the i2c device matching the CX18_HW_ flag and return
 297    its i2c address or -ENODEV if no matching device was found. */
 298 int cx18_i2c_hw_addr(struct cx18 *cx, u32 hw)
 299 {
 300         int i;
 301
 302         for (i = 0; i < ARRAY_SIZE(hw_driverids); i++)
 303                 if (1 << i == hw)
 304                         return cx18_i2c_id_addr(cx, hw_driverids[i]);
 305         return -ENODEV;
 306 }
 307
 308 /* Calls i2c device based on CX18_HW_ flag. If hw == 0, then do nothing.
 309    If hw == CX18_HW_GPIO then call the gpio handler. */
 310 int cx18_i2c_hw(struct cx18 *cx, u32 hw, unsigned int cmd, void *arg)
 311 {
 312         int addr;
 313
 314         if (hw == CX18_HW_GPIO || hw == 0)
 315                 return 0;
 316         if (hw == CX18_HW_CX23418)
 317                 return cx18_av_cmd(cx, cmd, arg);
 318
 319         addr = cx18_i2c_hw_addr(cx, hw);
 320         if (addr < 0) {
 321                 CX18_ERR("i2c hardware 0x%08x (%s) not found for cmd 0x%x!\n",
 322                                hw, cx18_i2c_hw_name(hw), cmd);
 323                 return addr;
 324         }
 325         return cx18_call_i2c_client(cx, addr, cmd, arg);
 326 }
 327
 328 /* Calls i2c device based on I2C driver ID. */
 329 int cx18_i2c_id(struct cx18 *cx, u32 id, unsigned int cmd, void *arg)
 330 {
 331         int addr;
 332
 333         addr = cx18_i2c_id_addr(cx, id);
 334         if (addr < 0) {
 335                 if (cmd != VIDIOC_G_CHIP_IDENT)
 336                         CX18_ERR("i2c ID 0x%08x (%s) not found for cmd 0x%x!\n",
 337                                 id, cx18_i2c_id_name(id), cmd);
 338                 return addr;
 339         }
 340         return cx18_call_i2c_client(cx, addr, cmd, arg);
 341 }
 342
 343 /* broadcast cmd for all I2C clients and for the gpio subsystem */
 344 void cx18_call_i2c_clients(struct cx18 *cx, unsigned int cmd, void *arg)
 345 {
 346         if (cx->i2c_adap[0].algo == NULL || cx->i2c_adap[1].algo == NULL) {
 347                 CX18_ERR("adapter is not set\n");
 348                 return;
 349         }
 350         cx18_av_cmd(cx, cmd, arg);
 351         i2c_clients_command(&cx->i2c_adap[0], cmd, arg);
 352         i2c_clients_command(&cx->i2c_adap[1], cmd, arg);
 353 }
 354
 355 /* init + register i2c algo-bit adapter */
 356 int init_cx18_i2c(struct cx18 *cx)
 357 {
 358         int i;
 359         CX18_DEBUG_I2C("i2c init\n");
 360
 361         for (i = 0; i < 2; i++) {
 362                 memcpy(&cx->i2c_adap[i], &cx18_i2c_adap_template,
 363                         sizeof(struct i2c_adapter));
 364                 memcpy(&cx->i2c_algo[i], &cx18_i2c_algo_template,
 365                         sizeof(struct i2c_algo_bit_data));
 366                 cx->i2c_algo_cb_data[i].cx = cx;
 367                 cx->i2c_algo_cb_data[i].bus_index = i;
 368                 cx->i2c_algo[i].data = &cx->i2c_algo_cb_data[i];
 369                 cx->i2c_adap[i].algo_data = &cx->i2c_algo[i];
 370
 371                 sprintf(cx->i2c_adap[i].name + strlen(cx->i2c_adap[i].name),
 372                                 " #%d-%d", cx->num, i);
 373                 i2c_set_adapdata(&cx->i2c_adap[i], cx);
 374
 375                 memcpy(&cx->i2c_client[i], &cx18_i2c_client_template,
 376                         sizeof(struct i2c_client));
 377                 sprintf(cx->i2c_client[i].name +
 378                                 strlen(cx->i2c_client[i].name), "%d", i);
 379                 cx->i2c_client[i].adapter = &cx->i2c_adap[i];
 380                 cx->i2c_adap[i].dev.parent = &cx->dev->dev;
 381         }
 382
 383         if (read_reg(CX18_REG_I2C_2_WR) != 0x0003c02f) {
 384                 /* Reset/Unreset I2C hardware block */
 385                 write_reg(0x10000000, 0xc71004); /* Clock select 220MHz */
 386                 write_reg_sync(0x10001000, 0xc71024); /* Clock Enable */
 387         }
 388         /* courtesy of Steven Toth <stoth@hauppauge.com> */
 389         write_reg_sync(0x00c00000, 0xc7001c);
 390         mdelay(10);
 391         write_reg_sync(0x00c000c0, 0xc7001c);
 392         mdelay(10);
 393         write_reg_sync(0x00c00000, 0xc7001c);
 394
 395         write_reg_sync(0x00c00000, 0xc730c8); /* Set to edge-triggered intrs. */
 396         write_reg_sync(0x00c00000, 0xc730c4); /* Clear any stale intrs */
 397
 398         /* Hw I2C1 Clock Freq ~100kHz */
 399         write_reg_sync(0x00021c0f & ~4, CX18_REG_I2C_1_WR);
 400         cx18_setscl(&cx->i2c_algo_cb_data[0], 1);
 401         cx18_setsda(&cx->i2c_algo_cb_data[0], 1);
 402
 403         /* Hw I2C2 Clock Freq ~100kHz */
 404         write_reg_sync(0x00021c0f & ~4, CX18_REG_I2C_2_WR);
 405         cx18_setscl(&cx->i2c_algo_cb_data[1], 1);
 406         cx18_setsda(&cx->i2c_algo_cb_data[1], 1);
 407
 408         return i2c_bit_add_bus(&cx->i2c_adap[0]) ||
 409                 i2c_bit_add_bus(&cx->i2c_adap[1]);
 410 }
 411
 412 void exit_cx18_i2c(struct cx18 *cx)
 413 {
 414         int i;
 415         CX18_DEBUG_I2C("i2c exit\n");
 416         write_reg(read_reg(CX18_REG_I2C_1_WR) | 4, CX18_REG_I2C_1_WR);
 417         write_reg(read_reg(CX18_REG_I2C_2_WR) | 4, CX18_REG_I2C_2_WR);
 418
 419         for (i = 0; i < 2; i++) {
 420                 i2c_del_adapter(&cx->i2c_adap[i]);
 421         }
 422 }
 423
 424 /*
 425    Hauppauge HVR1600 should have:
 426    32 cx24227
 427    98 unknown
 428    a0 eeprom
 429    c2 tuner
 430    e? zilog ir
 431    */