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  *  Copyright (C) 2008  Andy Walls <awalls@radix.net>
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or
  12  *  (at your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful,
  15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *  GNU General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License
  20  *  along with this program; if not, write to the Free Software
  21  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  22  *  02111-1307  USA
  23  */
  24
  25 #include "cx18-driver.h"
  26 #include "cx18-io.h"
  27 #include "cx18-cards.h"
  28 #include "cx18-gpio.h"
  29 #include "cx18-av-core.h"
  30 #include "cx18-i2c.h"
  31 #include "cx18-irq.h"
  32
  33 #define CX18_REG_I2C_1_WR   0xf15000
  34 #define CX18_REG_I2C_1_RD   0xf15008
  35 #define CX18_REG_I2C_2_WR   0xf25100
  36 #define CX18_REG_I2C_2_RD   0xf25108
  37
  38 #define SETSCL_BIT      0x0001
  39 #define SETSDL_BIT      0x0002
  40 #define GETSCL_BIT      0x0004
  41 #define GETSDL_BIT      0x0008
  42
  43 #define CX18_CS5345_I2C_ADDR            0x4c
  44
  45 /* This array should match the CX18_HW_ defines */
  46 static const u8 hw_driverids[] = {
  47         I2C_DRIVERID_TUNER,
  48         I2C_DRIVERID_TVEEPROM,
  49         I2C_DRIVERID_CS5345,
  50         0,              /* CX18_HW_GPIO dummy driver ID */
  51         0               /* CX18_HW_CX23418 dummy driver ID */
  52 };
  53
  54 /* This array should match the CX18_HW_ defines */
  55 static const u8 hw_addrs[] = {
  56         0,
  57         0,
  58         CX18_CS5345_I2C_ADDR,
  59         0,              /* CX18_HW_GPIO dummy driver ID */
  60         0,              /* CX18_HW_CX23418 dummy driver ID */
  61 };
  62
  63 /* This array should match the CX18_HW_ defines */
  64 /* This might well become a card-specific array */
  65 static const u8 hw_bus[] = {
  66         0,
  67         0,
  68         0,
  69         0,              /* CX18_HW_GPIO dummy driver ID */
  70         0,              /* CX18_HW_CX23418 dummy driver ID */
  71 };
  72
  73 /* This array should match the CX18_HW_ defines */
  74 static const char * const hw_devicenames[] = {
  75         "tuner",
  76         "tveeprom",
  77         "cs5345",
  78         "gpio",
  79         "cx23418",
  80 };
  81
  82 int cx18_i2c_register(struct cx18 *cx, unsigned idx)
  83 {
  84         struct i2c_board_info info;
  85         struct i2c_client *c;
  86         u8 id, bus;
  87         int i;
  88
  89         CX18_DEBUG_I2C("i2c client register\n");
  90         if (idx >= ARRAY_SIZE(hw_driverids) || hw_driverids[idx] == 0)
  91                 return -1;
  92         id = hw_driverids[idx];
  93         bus = hw_bus[idx];
  94         memset(&info, 0, sizeof(info));
  95         strlcpy(info.type, hw_devicenames[idx], sizeof(info.type));
  96         info.addr = hw_addrs[idx];
  97         for (i = 0; i < I2C_CLIENTS_MAX; i++)
  98                 if (cx->i2c_clients[i] == NULL)
  99                         break;
 100
 101         if (i == I2C_CLIENTS_MAX) {
 102                 CX18_ERR("insufficient room for new I2C client!\n");
 103                 return -ENOMEM;
 104         }
 105
 106         if (id != I2C_DRIVERID_TUNER) {
 107                 c = i2c_new_device(&cx->i2c_adap[bus], &info);
 108                 if (c->driver == NULL)
 109                         i2c_unregister_device(c);
 110                 else
 111                         cx->i2c_clients[i] = c;
 112                 return cx->i2c_clients[i] ? 0 : -ENODEV;
 113         }
 114
 115         /* special tuner handling */
 116         c = i2c_new_probed_device(&cx->i2c_adap[1], &info, cx->card_i2c->radio);
 117         if (c && c->driver == NULL)
 118                 i2c_unregister_device(c);
 119         else if (c)
 120                 cx->i2c_clients[i++] = c;
 121         c = i2c_new_probed_device(&cx->i2c_adap[1], &info, cx->card_i2c->demod);
 122         if (c && c->driver == NULL)
 123                 i2c_unregister_device(c);
 124         else if (c)
 125                 cx->i2c_clients[i++] = c;
 126         c = i2c_new_probed_device(&cx->i2c_adap[1], &info, cx->card_i2c->tv);
 127         if (c && c->driver == NULL)
 128                 i2c_unregister_device(c);
 129         else if (c)
 130                 cx->i2c_clients[i++] = c;
 131         return 0;
 132 }
 133
 134 static int attach_inform(struct i2c_client *client)
 135 {
 136         return 0;
 137 }
 138
 139 static int detach_inform(struct i2c_client *client)
 140 {
 141         int i;
 142         struct cx18 *cx = (struct cx18 *)i2c_get_adapdata(client->adapter);
 143
 144         CX18_DEBUG_I2C("i2c client detach\n");
 145         for (i = 0; i < I2C_CLIENTS_MAX; i++) {
 146                 if (cx->i2c_clients[i] == client) {
 147                         cx->i2c_clients[i] = NULL;
 148                         break;
 149                 }
 150         }
 151         CX18_DEBUG_I2C("i2c detach [client=%s,%s]\n",
 152                    client->name, (i < I2C_CLIENTS_MAX) ? "ok" : "failed");
 153
 154         return 0;
 155 }
 156
 157 static void cx18_setscl(void *data, int state)
 158 {
 159         struct cx18 *cx = ((struct cx18_i2c_algo_callback_data *)data)->cx;
 160         int bus_index = ((struct cx18_i2c_algo_callback_data *)data)->bus_index;
 161         u32 addr = bus_index ? CX18_REG_I2C_2_WR : CX18_REG_I2C_1_WR;
 162         u32 r = cx18_read_reg(cx, addr);
 163
 164         if (state)
 165                 cx18_write_reg(cx, r | SETSCL_BIT, addr);
 166         else
 167                 cx18_write_reg(cx, r & ~SETSCL_BIT, addr);
 168 }
 169
 170 static void cx18_setsda(void *data, int state)
 171 {
 172         struct cx18 *cx = ((struct cx18_i2c_algo_callback_data *)data)->cx;
 173         int bus_index = ((struct cx18_i2c_algo_callback_data *)data)->bus_index;
 174         u32 addr = bus_index ? CX18_REG_I2C_2_WR : CX18_REG_I2C_1_WR;
 175         u32 r = cx18_read_reg(cx, addr);
 176
 177         if (state)
 178                 cx18_write_reg(cx, r | SETSDL_BIT, addr);
 179         else
 180                 cx18_write_reg(cx, r & ~SETSDL_BIT, addr);
 181 }
 182
 183 static int cx18_getscl(void *data)
 184 {
 185         struct cx18 *cx = ((struct cx18_i2c_algo_callback_data *)data)->cx;
 186         int bus_index = ((struct cx18_i2c_algo_callback_data *)data)->bus_index;
 187         u32 addr = bus_index ? CX18_REG_I2C_2_RD : CX18_REG_I2C_1_RD;
 188
 189         return cx18_read_reg(cx, addr) & GETSCL_BIT;
 190 }
 191
 192 static int cx18_getsda(void *data)
 193 {
 194         struct cx18 *cx = ((struct cx18_i2c_algo_callback_data *)data)->cx;
 195         int bus_index = ((struct cx18_i2c_algo_callback_data *)data)->bus_index;
 196         u32 addr = bus_index ? CX18_REG_I2C_2_RD : CX18_REG_I2C_1_RD;
 197
 198         return cx18_read_reg(cx, addr) & GETSDL_BIT;
 199 }
 200
 201 /* template for i2c-bit-algo */
 202 static struct i2c_adapter cx18_i2c_adap_template = {
 203         .name = "cx18 i2c driver",
 204         .id = I2C_HW_B_CX2341X,
 205         .algo = NULL,                   /* set by i2c-algo-bit */
 206         .algo_data = NULL,              /* filled from template */
 207         .client_register = attach_inform,
 208         .client_unregister = detach_inform,
 209         .owner = THIS_MODULE,
 210 };
 211
 212 #define CX18_SCL_PERIOD (10) /* usecs. 10 usec is period for a 100 KHz clock */
 213 #define CX18_ALGO_BIT_TIMEOUT (2) /* seconds */
 214
 215 static struct i2c_algo_bit_data cx18_i2c_algo_template = {
 216         .setsda         = cx18_setsda,
 217         .setscl         = cx18_setscl,
 218         .getsda         = cx18_getsda,
 219         .getscl         = cx18_getscl,
 220         .udelay         = CX18_SCL_PERIOD/2,       /* 1/2 clock period in usec*/
 221         .timeout        = CX18_ALGO_BIT_TIMEOUT*HZ /* jiffies */
 222 };
 223
 224 static struct i2c_client cx18_i2c_client_template = {
 225         .name = "cx18 internal",
 226 };
 227
 228 int cx18_call_i2c_client(struct cx18 *cx, int addr, unsigned cmd, void *arg)
 229 {
 230         struct i2c_client *client;
 231         int retval;
 232         int i;
 233
 234         CX18_DEBUG_I2C("call_i2c_client addr=%02x\n", addr);
 235         for (i = 0; i < I2C_CLIENTS_MAX; i++) {
 236                 client = cx->i2c_clients[i];
 237                 if (client == NULL || client->driver == NULL ||
 238                                 client->driver->command == NULL)
 239                         continue;
 240                 if (addr == client->addr) {
 241                         retval = client->driver->command(client, cmd, arg);
 242                         return retval;
 243                 }
 244         }
 245         if (cmd != VIDIOC_DBG_G_CHIP_IDENT)
 246                 CX18_ERR("i2c addr 0x%02x not found for cmd 0x%x!\n",
 247                                addr, cmd);
 248         return -ENODEV;
 249 }
 250
 251 /* Find the i2c device based on the driver ID and return
 252    its i2c address or -ENODEV if no matching device was found. */
 253 static int cx18_i2c_id_addr(struct cx18 *cx, u32 id)
 254 {
 255         struct i2c_client *client;
 256         int retval = -ENODEV;
 257         int i;
 258
 259         for (i = 0; i < I2C_CLIENTS_MAX; i++) {
 260                 client = cx->i2c_clients[i];
 261                 if (client == NULL || client->driver == NULL)
 262                         continue;
 263                 if (id == client->driver->id) {
 264                         retval = client->addr;
 265                         break;
 266                 }
 267         }
 268         return retval;
 269 }
 270
 271 /* Find the i2c device name matching the CX18_HW_ flag */
 272 static const char *cx18_i2c_hw_name(u32 hw)
 273 {
 274         int i;
 275
 276         for (i = 0; i < ARRAY_SIZE(hw_driverids); i++)
 277                 if (1 << i == hw)
 278                         return hw_devicenames[i];
 279         return "unknown device";
 280 }
 281
 282 /* Find the i2c device matching the CX18_HW_ flag and return
 283    its i2c address or -ENODEV if no matching device was found. */
 284 int cx18_i2c_hw_addr(struct cx18 *cx, u32 hw)
 285 {
 286         int i;
 287
 288         for (i = 0; i < ARRAY_SIZE(hw_driverids); i++)
 289                 if (1 << i == hw)
 290                         return cx18_i2c_id_addr(cx, hw_driverids[i]);
 291         return -ENODEV;
 292 }
 293
 294 /* Calls i2c device based on CX18_HW_ flag. If hw == 0, then do nothing.
 295    If hw == CX18_HW_GPIO then call the gpio handler. */
 296 int cx18_i2c_hw(struct cx18 *cx, u32 hw, unsigned int cmd, void *arg)
 297 {
 298         int addr;
 299
 300         if (hw == 0)
 301                 return 0;
 302
 303         if (hw == CX18_HW_GPIO)
 304                 return cx18_gpio(cx, cmd, arg);
 305
 306         if (hw == CX18_HW_CX23418)
 307                 return cx18_av_cmd(cx, cmd, arg);
 308
 309         addr = cx18_i2c_hw_addr(cx, hw);
 310         if (addr < 0) {
 311                 CX18_ERR("i2c hardware 0x%08x (%s) not found for cmd 0x%x!\n",
 312                                hw, cx18_i2c_hw_name(hw), cmd);
 313                 return addr;
 314         }
 315         return cx18_call_i2c_client(cx, addr, cmd, arg);
 316 }
 317
 318 /* broadcast cmd for all I2C clients and for the gpio subsystem */
 319 void cx18_call_i2c_clients(struct cx18 *cx, unsigned int cmd, void *arg)
 320 {
 321         if (cx->i2c_adap[0].algo == NULL || cx->i2c_adap[1].algo == NULL) {
 322                 CX18_ERR("adapter is not set\n");
 323                 return;
 324         }
 325         cx18_av_cmd(cx, cmd, arg);
 326         i2c_clients_command(&cx->i2c_adap[0], cmd, arg);
 327         i2c_clients_command(&cx->i2c_adap[1], cmd, arg);
 328         if (cx->hw_flags & CX18_HW_GPIO)
 329                 cx18_gpio(cx, cmd, arg);
 330 }
 331
 332 /* init + register i2c algo-bit adapter */
 333 int init_cx18_i2c(struct cx18 *cx)
 334 {
 335         int i;
 336         CX18_DEBUG_I2C("i2c init\n");
 337
 338         /* Sanity checks for the I2C hardware arrays. They must be the
 339          * same size and GPIO/CX23418 must be the last entries.
 340          */
 341         if (ARRAY_SIZE(hw_driverids) != ARRAY_SIZE(hw_addrs) ||
 342             ARRAY_SIZE(hw_devicenames) != ARRAY_SIZE(hw_addrs) ||
 343             CX18_HW_GPIO != (1 << (ARRAY_SIZE(hw_addrs) - 2)) ||
 344             CX18_HW_CX23418 != (1 << (ARRAY_SIZE(hw_addrs) - 1)) ||
 345             hw_driverids[ARRAY_SIZE(hw_addrs) - 1]) {
 346                 CX18_ERR("Mismatched I2C hardware arrays\n");
 347                 return -ENODEV;
 348         }
 349
 350         for (i = 0; i < 2; i++) {
 351                 memcpy(&cx->i2c_adap[i], &cx18_i2c_adap_template,
 352                         sizeof(struct i2c_adapter));
 353                 memcpy(&cx->i2c_algo[i], &cx18_i2c_algo_template,
 354                         sizeof(struct i2c_algo_bit_data));
 355                 cx->i2c_algo_cb_data[i].cx = cx;
 356                 cx->i2c_algo_cb_data[i].bus_index = i;
 357                 cx->i2c_algo[i].data = &cx->i2c_algo_cb_data[i];
 358                 cx->i2c_adap[i].algo_data = &cx->i2c_algo[i];
 359
 360                 sprintf(cx->i2c_adap[i].name + strlen(cx->i2c_adap[i].name),
 361                                 " #%d-%d", cx->num, i);
 362                 i2c_set_adapdata(&cx->i2c_adap[i], cx);
 363
 364                 memcpy(&cx->i2c_client[i], &cx18_i2c_client_template,
 365                         sizeof(struct i2c_client));
 366                 sprintf(cx->i2c_client[i].name +
 367                                 strlen(cx->i2c_client[i].name), "%d", i);
 368                 cx->i2c_client[i].adapter = &cx->i2c_adap[i];
 369                 cx->i2c_adap[i].dev.parent = &cx->dev->dev;
 370         }
 371
 372         if (cx18_read_reg(cx, CX18_REG_I2C_2_WR) != 0x0003c02f) {
 373                 /* Reset/Unreset I2C hardware block */
 374                 /* Clock select 220MHz */
 375                 cx18_write_reg_expect(cx, 0x10000000, 0xc71004,
 376                                           0x00000000, 0x10001000);
 377                 /* Clock Enable */
 378                 cx18_write_reg_expect(cx, 0x10001000, 0xc71024,
 379                                           0x00001000, 0x10001000);
 380         }
 381         /* courtesy of Steven Toth <stoth@hauppauge.com> */
 382         cx18_write_reg_expect(cx, 0x00c00000, 0xc7001c, 0x00000000, 0x00c000c0);
 383         mdelay(10);
 384         cx18_write_reg_expect(cx, 0x00c000c0, 0xc7001c, 0x000000c0, 0x00c000c0);
 385         mdelay(10);
 386         cx18_write_reg_expect(cx, 0x00c00000, 0xc7001c, 0x00000000, 0x00c000c0);
 387         mdelay(10);
 388
 389         /* Set to edge-triggered intrs. */
 390         cx18_write_reg(cx, 0x00c00000, 0xc730c8);
 391         /* Clear any stale intrs */
 392         cx18_write_reg_expect(cx, HW2_I2C1_INT|HW2_I2C2_INT, HW2_INT_CLR_STATUS,
 393                        ~(HW2_I2C1_INT|HW2_I2C2_INT), HW2_I2C1_INT|HW2_I2C2_INT);
 394
 395         /* Hw I2C1 Clock Freq ~100kHz */
 396         cx18_write_reg(cx, 0x00021c0f & ~4, CX18_REG_I2C_1_WR);
 397         cx18_setscl(&cx->i2c_algo_cb_data[0], 1);
 398         cx18_setsda(&cx->i2c_algo_cb_data[0], 1);
 399
 400         /* Hw I2C2 Clock Freq ~100kHz */
 401         cx18_write_reg(cx, 0x00021c0f & ~4, CX18_REG_I2C_2_WR);
 402         cx18_setscl(&cx->i2c_algo_cb_data[1], 1);
 403         cx18_setsda(&cx->i2c_algo_cb_data[1], 1);
 404
 405         cx18_reset_i2c_slaves_gpio(cx);
 406
 407         return i2c_bit_add_bus(&cx->i2c_adap[0]) ||
 408                 i2c_bit_add_bus(&cx->i2c_adap[1]);
 409 }
 410
 411 void exit_cx18_i2c(struct cx18 *cx)
 412 {
 413         int i;
 414         CX18_DEBUG_I2C("i2c exit\n");
 415         cx18_write_reg(cx, cx18_read_reg(cx, CX18_REG_I2C_1_WR) | 4,
 416                                                         CX18_REG_I2C_1_WR);
 417         cx18_write_reg(cx, cx18_read_reg(cx, CX18_REG_I2C_2_WR) | 4,
 418                                                         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    */