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@md.metrocast.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-i2c.h"
  30 #include "cx18-irq.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 #define CX18_CS5345_I2C_ADDR            0x4c
  43 #define CX18_Z8F0811_IR_TX_I2C_ADDR     0x70
  44 #define CX18_Z8F0811_IR_RX_I2C_ADDR     0x71
  45
  46 /* This array should match the CX18_HW_ defines */
  47 static const u8 hw_addrs[] = {
  48         0,                              /* CX18_HW_TUNER */
  49         0,                              /* CX18_HW_TVEEPROM */
  50         CX18_CS5345_I2C_ADDR,           /* CX18_HW_CS5345 */
  51         0,                              /* CX18_HW_DVB */
  52         0,                              /* CX18_HW_418_AV */
  53         0,                              /* CX18_HW_GPIO_MUX */
  54         0,                              /* CX18_HW_GPIO_RESET_CTRL */
  55         CX18_Z8F0811_IR_TX_I2C_ADDR,    /* CX18_HW_Z8F0811_IR_TX_HAUP */
  56         CX18_Z8F0811_IR_RX_I2C_ADDR,    /* CX18_HW_Z8F0811_IR_RX_HAUP */
  57 };
  58
  59 /* This array should match the CX18_HW_ defines */
  60 /* This might well become a card-specific array */
  61 static const u8 hw_bus[] = {
  62         1,      /* CX18_HW_TUNER */
  63         0,      /* CX18_HW_TVEEPROM */
  64         0,      /* CX18_HW_CS5345 */
  65         0,      /* CX18_HW_DVB */
  66         0,      /* CX18_HW_418_AV */
  67         0,      /* CX18_HW_GPIO_MUX */
  68         0,      /* CX18_HW_GPIO_RESET_CTRL */
  69         0,      /* CX18_HW_Z8F0811_IR_TX_HAUP */
  70         0,      /* CX18_HW_Z8F0811_IR_RX_HAUP */
  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         "cx23418_DTV",
  79         "cx23418_AV",
  80         "gpio_mux",
  81         "gpio_reset_ctrl",
  82         "ir_tx_z8f0811_haup",
  83         "ir_rx_z8f0811_haup",
  84 };
  85
  86 static int cx18_i2c_new_ir(struct cx18 *cx, struct i2c_adapter *adap, u32 hw,
  87                            const char *type, u8 addr)
  88 {
  89         struct i2c_board_info info;
  90         struct IR_i2c_init_data *init_data = &cx->ir_i2c_init_data;
  91         unsigned short addr_list[2] = { addr, I2C_CLIENT_END };
  92
  93         memset(&info, 0, sizeof(struct i2c_board_info));
  94         strlcpy(info.type, type, I2C_NAME_SIZE);
  95
  96         /* Our default information for ir-kbd-i2c.c to use */
  97         switch (hw) {
  98         case CX18_HW_Z8F0811_IR_RX_HAUP:
  99                 init_data->ir_codes = RC_MAP_HAUPPAUGE;
 100                 init_data->internal_get_key_func = IR_KBD_GET_KEY_HAUP_XVR;
 101                 init_data->type = RC_TYPE_RC5;
 102                 init_data->name = cx->card_name;
 103                 info.platform_data = init_data;
 104                 break;
 105         }
 106
 107         return i2c_new_probed_device(adap, &info, addr_list, NULL) == NULL ?
 108                -1 : 0;
 109 }
 110
 111 int cx18_i2c_register(struct cx18 *cx, unsigned idx)
 112 {
 113         struct v4l2_subdev *sd;
 114         int bus = hw_bus[idx];
 115         struct i2c_adapter *adap = &cx->i2c_adap[bus];
 116         const char *type = hw_devicenames[idx];
 117         u32 hw = 1 << idx;
 118
 119         if (idx >= ARRAY_SIZE(hw_addrs))
 120                 return -1;
 121
 122         if (hw == CX18_HW_TUNER) {
 123                 /* special tuner group handling */
 124                 sd = v4l2_i2c_new_subdev(&cx->v4l2_dev,
 125                                 adap, type, 0, cx->card_i2c->radio);
 126                 if (sd != NULL)
 127                         sd->grp_id = hw;
 128                 sd = v4l2_i2c_new_subdev(&cx->v4l2_dev,
 129                                 adap, type, 0, cx->card_i2c->demod);
 130                 if (sd != NULL)
 131                         sd->grp_id = hw;
 132                 sd = v4l2_i2c_new_subdev(&cx->v4l2_dev,
 133                                 adap, type, 0, cx->card_i2c->tv);
 134                 if (sd != NULL)
 135                         sd->grp_id = hw;
 136                 return sd != NULL ? 0 : -1;
 137         }
 138
 139         if (hw & CX18_HW_IR_ANY)
 140                 return cx18_i2c_new_ir(cx, adap, hw, type, hw_addrs[idx]);
 141
 142         /* Is it not an I2C device or one we do not wish to register? */
 143         if (!hw_addrs[idx])
 144                 return -1;
 145
 146         /* It's an I2C device other than an analog tuner or IR chip */
 147         sd = v4l2_i2c_new_subdev(&cx->v4l2_dev, adap, type, hw_addrs[idx],
 148                                  NULL);
 149         if (sd != NULL)
 150                 sd->grp_id = hw;
 151         return sd != NULL ? 0 : -1;
 152 }
 153
 154 /* Find the first member of the subdev group id in hw */
 155 struct v4l2_subdev *cx18_find_hw(struct cx18 *cx, u32 hw)
 156 {
 157         struct v4l2_subdev *result = NULL;
 158         struct v4l2_subdev *sd;
 159
 160         spin_lock(&cx->v4l2_dev.lock);
 161         v4l2_device_for_each_subdev(sd, &cx->v4l2_dev) {
 162                 if (sd->grp_id == hw) {
 163                         result = sd;
 164                         break;
 165                 }
 166         }
 167         spin_unlock(&cx->v4l2_dev.lock);
 168         return result;
 169 }
 170
 171 static void cx18_setscl(void *data, int state)
 172 {
 173         struct cx18 *cx = ((struct cx18_i2c_algo_callback_data *)data)->cx;
 174         int bus_index = ((struct cx18_i2c_algo_callback_data *)data)->bus_index;
 175         u32 addr = bus_index ? CX18_REG_I2C_2_WR : CX18_REG_I2C_1_WR;
 176         u32 r = cx18_read_reg(cx, addr);
 177
 178         if (state)
 179                 cx18_write_reg(cx, r | SETSCL_BIT, addr);
 180         else
 181                 cx18_write_reg(cx, r & ~SETSCL_BIT, addr);
 182 }
 183
 184 static void cx18_setsda(void *data, int state)
 185 {
 186         struct cx18 *cx = ((struct cx18_i2c_algo_callback_data *)data)->cx;
 187         int bus_index = ((struct cx18_i2c_algo_callback_data *)data)->bus_index;
 188         u32 addr = bus_index ? CX18_REG_I2C_2_WR : CX18_REG_I2C_1_WR;
 189         u32 r = cx18_read_reg(cx, addr);
 190
 191         if (state)
 192                 cx18_write_reg(cx, r | SETSDL_BIT, addr);
 193         else
 194                 cx18_write_reg(cx, r & ~SETSDL_BIT, addr);
 195 }
 196
 197 static int cx18_getscl(void *data)
 198 {
 199         struct cx18 *cx = ((struct cx18_i2c_algo_callback_data *)data)->cx;
 200         int bus_index = ((struct cx18_i2c_algo_callback_data *)data)->bus_index;
 201         u32 addr = bus_index ? CX18_REG_I2C_2_RD : CX18_REG_I2C_1_RD;
 202
 203         return cx18_read_reg(cx, addr) & GETSCL_BIT;
 204 }
 205
 206 static int cx18_getsda(void *data)
 207 {
 208         struct cx18 *cx = ((struct cx18_i2c_algo_callback_data *)data)->cx;
 209         int bus_index = ((struct cx18_i2c_algo_callback_data *)data)->bus_index;
 210         u32 addr = bus_index ? CX18_REG_I2C_2_RD : CX18_REG_I2C_1_RD;
 211
 212         return cx18_read_reg(cx, addr) & GETSDL_BIT;
 213 }
 214
 215 /* template for i2c-bit-algo */
 216 static struct i2c_adapter cx18_i2c_adap_template = {
 217         .name = "cx18 i2c driver",
 218         .algo = NULL,                   /* set by i2c-algo-bit */
 219         .algo_data = NULL,              /* filled from template */
 220         .owner = THIS_MODULE,
 221 };
 222
 223 #define CX18_SCL_PERIOD (10) /* usecs. 10 usec is period for a 100 KHz clock */
 224 #define CX18_ALGO_BIT_TIMEOUT (2) /* seconds */
 225
 226 static struct i2c_algo_bit_data cx18_i2c_algo_template = {
 227         .setsda         = cx18_setsda,
 228         .setscl         = cx18_setscl,
 229         .getsda         = cx18_getsda,
 230         .getscl         = cx18_getscl,
 231         .udelay         = CX18_SCL_PERIOD/2,       /* 1/2 clock period in usec*/
 232         .timeout        = CX18_ALGO_BIT_TIMEOUT*HZ /* jiffies */
 233 };
 234
 235 /* init + register i2c algo-bit adapter */
 236 int init_cx18_i2c(struct cx18 *cx)
 237 {
 238         int i, err;
 239         CX18_DEBUG_I2C("i2c init\n");
 240
 241         for (i = 0; i < 2; i++) {
 242                 /* Setup algorithm for adapter */
 243                 memcpy(&cx->i2c_algo[i], &cx18_i2c_algo_template,
 244                         sizeof(struct i2c_algo_bit_data));
 245                 cx->i2c_algo_cb_data[i].cx = cx;
 246                 cx->i2c_algo_cb_data[i].bus_index = i;
 247                 cx->i2c_algo[i].data = &cx->i2c_algo_cb_data[i];
 248
 249                 /* Setup adapter */
 250                 memcpy(&cx->i2c_adap[i], &cx18_i2c_adap_template,
 251                         sizeof(struct i2c_adapter));
 252                 cx->i2c_adap[i].algo_data = &cx->i2c_algo[i];
 253                 sprintf(cx->i2c_adap[i].name + strlen(cx->i2c_adap[i].name),
 254                                 " #%d-%d", cx->instance, i);
 255                 i2c_set_adapdata(&cx->i2c_adap[i], &cx->v4l2_dev);
 256                 cx->i2c_adap[i].dev.parent = &cx->pci_dev->dev;
 257         }
 258
 259         if (cx18_read_reg(cx, CX18_REG_I2C_2_WR) != 0x0003c02f) {
 260                 /* Reset/Unreset I2C hardware block */
 261                 /* Clock select 220MHz */
 262                 cx18_write_reg_expect(cx, 0x10000000, 0xc71004,
 263                                           0x00000000, 0x10001000);
 264                 /* Clock Enable */
 265                 cx18_write_reg_expect(cx, 0x10001000, 0xc71024,
 266                                           0x00001000, 0x10001000);
 267         }
 268         /* courtesy of Steven Toth <stoth@hauppauge.com> */
 269         cx18_write_reg_expect(cx, 0x00c00000, 0xc7001c, 0x00000000, 0x00c000c0);
 270         mdelay(10);
 271         cx18_write_reg_expect(cx, 0x00c000c0, 0xc7001c, 0x000000c0, 0x00c000c0);
 272         mdelay(10);
 273         cx18_write_reg_expect(cx, 0x00c00000, 0xc7001c, 0x00000000, 0x00c000c0);
 274         mdelay(10);
 275
 276         /* Set to edge-triggered intrs. */
 277         cx18_write_reg(cx, 0x00c00000, 0xc730c8);
 278         /* Clear any stale intrs */
 279         cx18_write_reg_expect(cx, HW2_I2C1_INT|HW2_I2C2_INT, HW2_INT_CLR_STATUS,
 280                        ~(HW2_I2C1_INT|HW2_I2C2_INT), HW2_I2C1_INT|HW2_I2C2_INT);
 281
 282         /* Hw I2C1 Clock Freq ~100kHz */
 283         cx18_write_reg(cx, 0x00021c0f & ~4, CX18_REG_I2C_1_WR);
 284         cx18_setscl(&cx->i2c_algo_cb_data[0], 1);
 285         cx18_setsda(&cx->i2c_algo_cb_data[0], 1);
 286
 287         /* Hw I2C2 Clock Freq ~100kHz */
 288         cx18_write_reg(cx, 0x00021c0f & ~4, CX18_REG_I2C_2_WR);
 289         cx18_setscl(&cx->i2c_algo_cb_data[1], 1);
 290         cx18_setsda(&cx->i2c_algo_cb_data[1], 1);
 291
 292         cx18_call_hw(cx, CX18_HW_GPIO_RESET_CTRL,
 293                      core, reset, (u32) CX18_GPIO_RESET_I2C);
 294
 295         err = i2c_bit_add_bus(&cx->i2c_adap[0]);
 296         if (err)
 297                 goto err;
 298         err = i2c_bit_add_bus(&cx->i2c_adap[1]);
 299         if (err)
 300                 goto err_del_bus_0;
 301         return 0;
 302
 303  err_del_bus_0:
 304         i2c_del_adapter(&cx->i2c_adap[0]);
 305  err:
 306         return err;
 307 }
 308
 309 void exit_cx18_i2c(struct cx18 *cx)
 310 {
 311         int i;
 312         CX18_DEBUG_I2C("i2c exit\n");
 313         cx18_write_reg(cx, cx18_read_reg(cx, CX18_REG_I2C_1_WR) | 4,
 314                                                         CX18_REG_I2C_1_WR);
 315         cx18_write_reg(cx, cx18_read_reg(cx, CX18_REG_I2C_2_WR) | 4,
 316                                                         CX18_REG_I2C_2_WR);
 317
 318         for (i = 0; i < 2; i++) {
 319                 i2c_del_adapter(&cx->i2c_adap[i]);
 320         }
 321 }
 322
 323 /*
 324    Hauppauge HVR1600 should have:
 325    32 cx24227
 326    98 unknown
 327    a0 eeprom
 328    c2 tuner
 329    e? zilog ir
 330    */