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 /*FIXME: Hack to avoid needing to patch i2c-id.h */
  36 #define I2C_HW_B_TM6000 I2C_HW_B_EM28XX
  37 /* ----------------------------------------------------------- */
  38
  39 static unsigned int i2c_debug = 0;
  40 module_param(i2c_debug, int, 0644);
  41 MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]");
  42
  43 #define i2c_dprintk(lvl,fmt, args...) if (i2c_debug>=lvl) do{ \
  44                         printk(KERN_DEBUG "%s at %s: " fmt, \
  45                         dev->name, __FUNCTION__ , ##args); } while (0)
  46
  47 static int tm6000_i2c_send_regs(struct tm6000_core *dev, unsigned char addr,
  48                                 __u8 reg, char *buf, int len)
  49 {
  50         return tm6000_read_write_usb(dev, USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  51                 REQ_16_SET_GET_I2C_WR1_RDN, addr | reg << 8, 0, buf, len);
  52 }
  53
  54 /* Generic read - doesn't work fine with 16bit registers */
  55 static int tm6000_i2c_recv_regs(struct tm6000_core *dev, unsigned char addr,
  56                                 __u8 reg, char *buf, int len)
  57 {
  58         int rc;
  59         u8 b[2];
  60
  61         if ((dev->caps.has_zl10353) && (dev->demod_addr << 1 == addr) && (reg % 2 == 0)) {
  62                 /*
  63                  * Workaround an I2C bug when reading from zl10353
  64                  */
  65                 reg -= 1;
  66                 len += 1;
  67
  68                 rc = tm6000_read_write_usb(dev, USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  69                         REQ_16_SET_GET_I2C_WR1_RDN, addr | reg << 8, 0, b, len);
  70
  71                 *buf = b[1];
  72         } else {
  73                 rc = tm6000_read_write_usb(dev, USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  74                         REQ_16_SET_GET_I2C_WR1_RDN, addr | reg << 8, 0, buf, len);
  75         }
  76
  77         return rc;
  78 }
  79
  80 /*
  81  * read from a 16bit register
  82  * for example xc2028, xc3028 or xc3028L
  83  */
  84 static int tm6000_i2c_recv_regs16(struct tm6000_core *dev, unsigned char addr,
  85                                   __u16 reg, char *buf, int len)
  86 {
  87         return tm6000_read_write_usb(dev, USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  88                 REQ_14_SET_GET_I2C_WR2_RDN, addr, reg, buf, len);
  89 }
  90
  91 static int tm6000_i2c_xfer(struct i2c_adapter *i2c_adap,
  92                            struct i2c_msg msgs[], int num)
  93 {
  94         struct tm6000_core *dev = i2c_adap->algo_data;
  95         int addr, rc, i, byte;
  96
  97         if (num <= 0)
  98                 return 0;
  99         for (i = 0; i < num; i++) {
 100                 addr = (msgs[i].addr << 1) & 0xff;
 101                 i2c_dprintk(2,"%s %s addr=0x%x len=%d:",
 102                          (msgs[i].flags & I2C_M_RD) ? "read" : "write",
 103                          i == num - 1 ? "stop" : "nonstop", addr, msgs[i].len);
 104                 if (msgs[i].flags & I2C_M_RD) {
 105                         /* read request without preceding register selection */
 106                         /*
 107                          * The TM6000 only supports a read transaction
 108                          * immediately after a 1 or 2 byte write to select
 109                          * a register.  We cannot fulfil this request.
 110                          */
 111                         i2c_dprintk(2, " read without preceding write not"
 112                                        " supported");
 113                         rc = -EOPNOTSUPP;
 114                         goto err;
 115                 } else if (i + 1 < num && msgs[i].len <= 2 &&
 116                            (msgs[i + 1].flags & I2C_M_RD) &&
 117                            msgs[i].addr == msgs[i + 1].addr) {
 118                         /* 1 or 2 byte write followed by a read */
 119                         if (i2c_debug >= 2)
 120                                 for (byte = 0; byte < msgs[i].len; byte++)
 121                                         printk(" %02x", msgs[i].buf[byte]);
 122                         i2c_dprintk(2, "; joined to read %s len=%d:",
 123                                     i == num - 2 ? "stop" : "nonstop",
 124                                     msgs[i + 1].len);
 125
 126                         if (msgs[i].len == 2) {
 127                                 rc = tm6000_i2c_recv_regs16(dev, addr,
 128                                         msgs[i].buf[0] << 8 | msgs[i].buf[1],
 129                                         msgs[i + 1].buf, msgs[i + 1].len);
 130                         } else {
 131                                 rc = tm6000_i2c_recv_regs(dev, addr, msgs[i].buf[0],
 132                                         msgs[i + 1].buf, msgs[i + 1].len);
 133                         }
 134
 135                         i++;
 136
 137                         if (addr == dev->tuner_addr << 1) {
 138                                 tm6000_set_reg(dev, 0x32, 0,0);
 139                                 tm6000_set_reg(dev, 0x33, 0,0);
 140                         }
 141                         if (i2c_debug >= 2)
 142                                 for (byte = 0; byte < msgs[i].len; byte++)
 143                                         printk(" %02x", msgs[i].buf[byte]);
 144                 } else {
 145                         /* write bytes */
 146                         if (i2c_debug >= 2)
 147                                 for (byte = 0; byte < msgs[i].len; byte++)
 148                                         printk(" %02x", msgs[i].buf[byte]);
 149                         rc = tm6000_i2c_send_regs(dev, addr, msgs[i].buf[0],
 150                                 msgs[i].buf + 1, msgs[i].len - 1);
 151
 152                         if (addr == dev->tuner_addr  << 1) {
 153                                 tm6000_set_reg(dev, 0x32, 0,0);
 154                                 tm6000_set_reg(dev, 0x33, 0,0);
 155                         }
 156                 }
 157                 if (i2c_debug >= 2)
 158                         printk("\n");
 159                 if (rc < 0)
 160                         goto err;
 161         }
 162
 163         return num;
 164 err:
 165         i2c_dprintk(2," ERROR: %i\n", rc);
 166         return rc;
 167 }
 168
 169 static int tm6000_i2c_eeprom(struct tm6000_core *dev,
 170                              unsigned char *eedata, int len)
 171 {
 172         int i, rc;
 173         unsigned char *p = eedata;
 174         unsigned char bytes[17];
 175
 176         dev->i2c_client.addr = 0xa0 >> 1;
 177
 178         bytes[16] = '\0';
 179         for (i = 0; i < len; ) {
 180         *p = i;
 181         rc = tm6000_i2c_recv_regs(dev, 0xa0, i, p, 1);
 182                 if (rc < 1) {
 183                         if (p == eedata)
 184                                 goto noeeprom;
 185                         else {
 186                                 printk(KERN_WARNING
 187                                 "%s: i2c eeprom read error (err=%d)\n",
 188                                 dev->name, rc);
 189                         }
 190                         return -1;
 191                 }
 192                 p++;
 193                 if (0 == (i % 16))
 194                         printk(KERN_INFO "%s: i2c eeprom %02x:", dev->name, i);
 195                 printk(" %02x", eedata[i]);
 196                 if ((eedata[i] >= ' ') && (eedata[i] <= 'z')) {
 197                         bytes[i%16] = eedata[i];
 198                 } else {
 199                         bytes[i%16]='.';
 200                 }
 201
 202                 i++;
 203
 204                 if (0 == (i % 16)) {
 205                         bytes[16] = '\0';
 206                         printk("  %s\n", bytes);
 207                 }
 208         }
 209         if (0 != (i%16)) {
 210                 bytes[i%16] = '\0';
 211                 for (i %= 16; i < 16; i++)
 212                         printk("   ");
 213         }
 214         printk("  %s\n", bytes);
 215
 216         return 0;
 217
 218 noeeprom:
 219         printk(KERN_INFO "%s: Huh, no eeprom present (err=%d)?\n",
 220                        dev->name, rc);
 221         return rc;
 222 }
 223
 224 /* ----------------------------------------------------------- */
 225
 226 /*
 227  * functionality()
 228  */
 229 static u32 functionality(struct i2c_adapter *adap)
 230 {
 231         return I2C_FUNC_SMBUS_EMUL;
 232 }
 233
 234 #define mass_write(addr, reg, data...)                                  \
 235         { const static u8 _val[] = data;                                \
 236         rc=tm6000_read_write_usb(dev,USB_DIR_OUT | USB_TYPE_VENDOR,     \
 237         REQ_16_SET_GET_I2C_WR1_RDN,(reg<<8)+addr, 0x00, (u8 *) _val,    \
 238         ARRAY_SIZE(_val));                                              \
 239         if (rc<0) {                                                     \
 240                 printk(KERN_ERR "Error on line %d: %d\n",__LINE__,rc);  \
 241                 return rc;                                              \
 242         }                                                               \
 243         msleep (10);                                                    \
 244         }
 245
 246 static struct i2c_algorithm tm6000_algo = {
 247         .master_xfer   = tm6000_i2c_xfer,
 248         .functionality = functionality,
 249 };
 250
 251 static struct i2c_adapter tm6000_adap_template = {
 252         .owner = THIS_MODULE,
 253         .class = I2C_CLASS_TV_ANALOG | I2C_CLASS_TV_DIGITAL,
 254         .name = "tm6000",
 255         .id = I2C_HW_B_TM6000,
 256         .algo = &tm6000_algo,
 257 };
 258
 259 static struct i2c_client tm6000_client_template = {
 260         .name = "tm6000 internal",
 261 };
 262
 263 /* ----------------------------------------------------------- */
 264
 265 /*
 266  * tm6000_i2c_register()
 267  * register i2c bus
 268  */
 269 int tm6000_i2c_register(struct tm6000_core *dev)
 270 {
 271         unsigned char eedata[256];
 272
 273         dev->i2c_adap = tm6000_adap_template;
 274         dev->i2c_adap.dev.parent = &dev->udev->dev;
 275         strcpy(dev->i2c_adap.name, dev->name);
 276         dev->i2c_adap.algo_data = dev;
 277         i2c_add_adapter(&dev->i2c_adap);
 278
 279         dev->i2c_client = tm6000_client_template;
 280         dev->i2c_client.adapter = &dev->i2c_adap;
 281
 282         i2c_set_adapdata(&dev->i2c_adap, &dev->v4l2_dev);
 283
 284         tm6000_i2c_eeprom(dev, eedata, sizeof(eedata));
 285
 286         return 0;
 287 }
 288
 289 /*
 290  * tm6000_i2c_unregister()
 291  * unregister i2c_bus
 292  */
 293 int tm6000_i2c_unregister(struct tm6000_core *dev)
 294 {
 295         i2c_del_adapter(&dev->i2c_adap);
 296         return 0;
 297 }