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