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