drivers/staging/tm6000/tm6000-i2c.c

   1 /*
   2  *  tm6000-i2c.c - driver for TM5600/TM6000/TM6010 USB video capture devices
   3  *
   4  *  Copyright (C) 2006-2007 Mauro Carvalho Chehab <mchehab@infradead.org>
   5  *
   6  *  Copyright (C) 2007 Michel Ludwig <michel.ludwig@gmail.com>
   7  *      - Fix SMBus Read Byte command
   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 version 2
  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., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  */
  22
  23 #include <linux/module.h>
  24 #include <linux/kernel.h>
  25 #include <linux/usb.h>
  26 #include <linux/i2c.h>
  27
  28 #include "tm6000.h"
  29 #include "tm6000-regs.h"
  30 #include <media/v4l2-common.h>
  31 #include <media/tuner.h>
  32 #include "tuner-xc2028.h"
  33
  34
  35 /* ----------------------------------------------------------- */
  36
  37 static unsigned int i2c_debug;
  38 module_param(i2c_debug, int, 0644);
  39 MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]");
  40
  41 #define i2c_dprintk(lvl, fmt, args...) if (i2c_debug >= lvl) do { \
  42                         printk(KERN_DEBUG "%s at %s: " fmt, \
  43                         dev->name, __func__, ##args); } while (0)
  44
  45 static int tm6000_i2c_send_regs(struct tm6000_core *dev, unsigned char addr,
  46                                 __u8 reg, char *buf, int len)
  47 {
  48         int rc;
  49         unsigned int tsleep;
  50         unsigned int i2c_packet_limit = 16;
  51
  52         if (dev->dev_type == TM6010)
  53                 i2c_packet_limit = 64;
  54
  55         if (!buf)
  56                 return -1;
  57
  58         if (len < 1 || len > i2c_packet_limit) {
  59                 printk(KERN_ERR "Incorrect length of i2c packet = %d, limit set to %d\n",
  60                         len, i2c_packet_limit);
  61                 return -1;
  62         }
  63
  64         /* capture mutex */
  65         rc = tm6000_read_write_usb(dev, USB_DIR_OUT | USB_TYPE_VENDOR |
  66                 USB_RECIP_DEVICE, REQ_16_SET_GET_I2C_WR1_RDN,
  67                 addr | reg << 8, 0, buf, len);
  68
  69         if (rc < 0) {
  70                 /* release mutex */
  71                 return rc;
  72         }
  73
  74         /* Calculate delay time, 14000us for 64 bytes */
  75         tsleep = ((len * 200) + 200 + 1000) / 1000;
  76         msleep(tsleep);
  77
  78         /* release mutex */
  79         return rc;
  80 }
  81
  82 /* Generic read - doesn't work fine with 16bit registers */
  83 static int tm6000_i2c_recv_regs(struct tm6000_core *dev, unsigned char addr,
  84                                 __u8 reg, char *buf, int len)
  85 {
  86         int rc;
  87         u8 b[2];
  88         unsigned int i2c_packet_limit = 16;
  89
  90         if (dev->dev_type == TM6010)
  91                 i2c_packet_limit = 64;
  92
  93         if (!buf)
  94                 return -1;
  95
  96         if (len < 1 || len > i2c_packet_limit) {
  97                 printk(KERN_ERR "Incorrect length of i2c packet = %d, limit set to %d\n",
  98                         len, i2c_packet_limit);
  99                 return -1;
 100         }
 101
 102         /* capture mutex */
 103         if ((dev->caps.has_zl10353) && (dev->demod_addr << 1 == addr) && (reg % 2 == 0)) {
 104                 /*
 105                  * Workaround an I2C bug when reading from zl10353
 106                  */
 107                 reg -= 1;
 108                 len += 1;
 109
 110                 rc = tm6000_read_write_usb(dev, USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 111                         REQ_16_SET_GET_I2C_WR1_RDN, addr | reg << 8, 0, b, len);
 112
 113                 *buf = b[1];
 114         } else {
 115                 rc = tm6000_read_write_usb(dev, USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 116                         REQ_16_SET_GET_I2C_WR1_RDN, addr | reg << 8, 0, buf, len);
 117         }
 118
 119         /* release mutex */
 120         return rc;
 121 }
 122
 123 /*
 124  * read from a 16bit register
 125  * for example xc2028, xc3028 or xc3028L
 126  */
 127 static int tm6000_i2c_recv_regs16(struct tm6000_core *dev, unsigned char addr,
 128                                   __u16 reg, char *buf, int len)
 129 {
 130         int rc;
 131         unsigned char ureg;
 132
 133         if (!buf || len != 2)
 134                 return -1;
 135
 136         /* capture mutex */
 137         if (dev->dev_type == TM6010) {
 138                 ureg = reg & 0xFF;
 139                 rc = tm6000_read_write_usb(dev, USB_DIR_OUT | USB_TYPE_VENDOR |
 140                         USB_RECIP_DEVICE, REQ_16_SET_GET_I2C_WR1_RDN,
 141                         addr | (reg & 0xFF00), 0, &ureg, 1);
 142
 143                 if (rc < 0) {
 144                         /* release mutex */
 145                         return rc;
 146                 }
 147
 148                 msleep(1400 / 1000);
 149                 rc = tm6000_read_write_usb(dev, USB_DIR_IN | USB_TYPE_VENDOR |
 150                         USB_RECIP_DEVICE, REQ_35_AFTEK_TUNER_READ,
 151                         reg, 0, buf, len);
 152         } else {
 153                 rc = tm6000_read_write_usb(dev, USB_DIR_IN | USB_TYPE_VENDOR |
 154                         USB_RECIP_DEVICE, REQ_14_SET_GET_I2C_WR2_RDN,
 155                         addr, reg, buf, len);
 156         }
 157
 158         /* release mutex */
 159         return rc;
 160 }
 161
 162 static int tm6000_i2c_xfer(struct i2c_adapter *i2c_adap,
 163                            struct i2c_msg msgs[], int num)
 164 {
 165         struct tm6000_core *dev = i2c_adap->algo_data;
 166         int addr, rc, i, byte;
 167
 168         if (num <= 0)
 169                 return 0;
 170         for (i = 0; i < num; i++) {
 171                 addr = (msgs[i].addr << 1) & 0xff;
 172                 i2c_dprintk(2, "%s %s addr=0x%x len=%d:",
 173                          (msgs[i].flags & I2C_M_RD) ? "read" : "write",
 174                          i == num - 1 ? "stop" : "nonstop", addr, msgs[i].len);
 175                 if (msgs[i].flags & I2C_M_RD) {
 176                         /* read request without preceding register selection */
 177                         /*
 178                          * The TM6000 only supports a read transaction
 179                          * immediately after a 1 or 2 byte write to select
 180                          * a register.  We cannot fulfil this request.
 181                          */
 182                         i2c_dprintk(2, " read without preceding write not"
 183                                        " supported");
 184                         rc = -EOPNOTSUPP;
 185                         goto err;
 186                 } else if (i + 1 < num && msgs[i].len <= 2 &&
 187                            (msgs[i + 1].flags & I2C_M_RD) &&
 188                            msgs[i].addr == msgs[i + 1].addr) {
 189                         /* 1 or 2 byte write followed by a read */
 190                         if (i2c_debug >= 2)
 191                                 for (byte = 0; byte < msgs[i].len; byte++)
 192                                         printk(KERN_CONT " %02x", msgs[i].buf[byte]);
 193                         i2c_dprintk(2, "; joined to read %s len=%d:",
 194                                     i == num - 2 ? "stop" : "nonstop",
 195                                     msgs[i + 1].len);
 196
 197                         if (msgs[i].len == 2) {
 198                                 rc = tm6000_i2c_recv_regs16(dev, addr,
 199                                         msgs[i].buf[0] << 8 | msgs[i].buf[1],
 200                                         msgs[i + 1].buf, msgs[i + 1].len);
 201                         } else {
 202                                 rc = tm6000_i2c_recv_regs(dev, addr, msgs[i].buf[0],
 203                                         msgs[i + 1].buf, msgs[i + 1].len);
 204                         }
 205
 206                         i++;
 207
 208                         if (addr == dev->tuner_addr << 1) {
 209                                 tm6000_set_reg(dev, REQ_50_SET_START, 0, 0);
 210                                 tm6000_set_reg(dev, REQ_51_SET_STOP, 0, 0);
 211                         }
 212                         if (i2c_debug >= 2)
 213                                 for (byte = 0; byte < msgs[i].len; byte++)
 214                                         printk(KERN_CONT " %02x", msgs[i].buf[byte]);
 215                 } else {
 216                         /* write bytes */
 217                         if (i2c_debug >= 2)
 218                                 for (byte = 0; byte < msgs[i].len; byte++)
 219                                         printk(KERN_CONT " %02x", msgs[i].buf[byte]);
 220                         rc = tm6000_i2c_send_regs(dev, addr, msgs[i].buf[0],
 221                                 msgs[i].buf + 1, msgs[i].len - 1);
 222                 }
 223                 if (i2c_debug >= 2)
 224                         printk(KERN_CONT "\n");
 225                 if (rc < 0)
 226                         goto err;
 227         }
 228
 229         return num;
 230 err:
 231         i2c_dprintk(2, " ERROR: %i\n", rc);
 232         return rc;
 233 }
 234
 235 static int tm6000_i2c_eeprom(struct tm6000_core *dev)
 236 {
 237         int i, rc;
 238         unsigned char *p = dev->eedata;
 239         unsigned char bytes[17];
 240
 241         dev->i2c_client.addr = 0xa0 >> 1;
 242         dev->eedata_size = 0;
 243
 244         bytes[16] = '\0';
 245         for (i = 0; i < sizeof(dev->eedata); ) {
 246                 *p = i;
 247                 rc = tm6000_i2c_recv_regs(dev, 0xa0, i, p, 1);
 248                 if (rc < 1) {
 249                         if (p == dev->eedata)
 250                                 goto noeeprom;
 251                         else {
 252                                 printk(KERN_WARNING
 253                                 "%s: i2c eeprom read error (err=%d)\n",
 254                                 dev->name, rc);
 255                         }
 256                         return -EINVAL;
 257                 }
 258                 dev->eedata_size++;
 259                 p++;
 260                 if (0 == (i % 16))
 261                         printk(KERN_INFO "%s: i2c eeprom %02x:", dev->name, i);
 262                 printk(KERN_CONT " %02x", dev->eedata[i]);
 263                 if ((dev->eedata[i] >= ' ') && (dev->eedata[i] <= 'z'))
 264                         bytes[i%16] = dev->eedata[i];
 265                 else
 266                         bytes[i%16] = '.';
 267
 268                 i++;
 269
 270                 if (0 == (i % 16)) {
 271                         bytes[16] = '\0';
 272                         printk(KERN_CONT "  %s\n", bytes);
 273                 }
 274         }
 275         if (0 != (i%16)) {
 276                 bytes[i%16] = '\0';
 277                 for (i %= 16; i < 16; i++)
 278                         printk(KERN_CONT "   ");
 279                 printk(KERN_CONT "  %s\n", bytes);
 280         }
 281
 282         return 0;
 283
 284 noeeprom:
 285         printk(KERN_INFO "%s: Huh, no eeprom present (err=%d)?\n",
 286                dev->name, rc);
 287         return -EINVAL;
 288 }
 289
 290 /* ----------------------------------------------------------- */
 291
 292 /*
 293  * functionality()
 294  */
 295 static u32 functionality(struct i2c_adapter *adap)
 296 {
 297         return I2C_FUNC_SMBUS_EMUL;
 298 }
 299
 300 static const struct i2c_algorithm tm6000_algo = {
 301         .master_xfer   = tm6000_i2c_xfer,
 302         .functionality = functionality,
 303 };
 304
 305 /* ----------------------------------------------------------- */
 306
 307 /*
 308  * tm6000_i2c_register()
 309  * register i2c bus
 310  */
 311 int tm6000_i2c_register(struct tm6000_core *dev)
 312 {
 313         int rc;
 314
 315         dev->i2c_adap.owner = THIS_MODULE;
 316         dev->i2c_adap.algo = &tm6000_algo;
 317         dev->i2c_adap.dev.parent = &dev->udev->dev;
 318         strlcpy(dev->i2c_adap.name, dev->name, sizeof(dev->i2c_adap.name));
 319         dev->i2c_adap.algo_data = dev;
 320         i2c_set_adapdata(&dev->i2c_adap, &dev->v4l2_dev);
 321         rc = i2c_add_adapter(&dev->i2c_adap);
 322         if (rc)
 323                 return rc;
 324
 325         dev->i2c_client.adapter = &dev->i2c_adap;
 326         strlcpy(dev->i2c_client.name, "tm6000 internal", I2C_NAME_SIZE);
 327         tm6000_i2c_eeprom(dev);
 328
 329         return 0;
 330 }
 331
 332 /*
 333  * tm6000_i2c_unregister()
 334  * unregister i2c_bus
 335  */
 336 int tm6000_i2c_unregister(struct tm6000_core *dev)
 337 {
 338         i2c_del_adapter(&dev->i2c_adap);
 339         return 0;
 340 }