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tm6000-i2c.c
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1 /*
2  * tm6000-i2c.c - driver for TM5600/TM6000/TM6010 USB video capture devices
3  *
4  * Copyright (C) 2006-2007 Mauro Carvalho Chehab <[email protected]>
5  *
6  * Copyright (C) 2007 Michel Ludwig <[email protected]>
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"
177  " supported");
178  rc = -EOPNOTSUPP;
179  goto err;
180  } else if (i + 1 < num && msgs[i].len <= 2 &&
181  (msgs[i + 1].flags & I2C_M_RD) &&
182  msgs[i].addr == msgs[i + 1].addr) {
183  /* 1 or 2 byte write followed by a read */
184  if (i2c_debug >= 2)
185  for (byte = 0; byte < msgs[i].len; byte++)
186  printk(KERN_CONT " %02x", msgs[i].buf[byte]);
187  i2c_dprintk(2, "; joined to read %s len=%d:",
188  i == num - 2 ? "stop" : "nonstop",
189  msgs[i + 1].len);
190 
191  if (msgs[i].len == 2) {
192  rc = tm6000_i2c_recv_regs16(dev, addr,
193  msgs[i].buf[0] << 8 | msgs[i].buf[1],
194  msgs[i + 1].buf, msgs[i + 1].len);
195  } else {
196  rc = tm6000_i2c_recv_regs(dev, addr, msgs[i].buf[0],
197  msgs[i + 1].buf, msgs[i + 1].len);
198  }
199 
200  i++;
201 
202  if (addr == dev->tuner_addr << 1) {
203  tm6000_set_reg(dev, REQ_50_SET_START, 0, 0);
204  tm6000_set_reg(dev, REQ_51_SET_STOP, 0, 0);
205  }
206  if (i2c_debug >= 2)
207  for (byte = 0; byte < msgs[i].len; byte++)
208  printk(KERN_CONT " %02x", msgs[i].buf[byte]);
209  } else {
210  /* write bytes */
211  if (i2c_debug >= 2)
212  for (byte = 0; byte < msgs[i].len; byte++)
213  printk(KERN_CONT " %02x", msgs[i].buf[byte]);
214  rc = tm6000_i2c_send_regs(dev, addr, msgs[i].buf[0],
215  msgs[i].buf + 1, msgs[i].len - 1);
216  }
217  if (i2c_debug >= 2)
218  printk(KERN_CONT "\n");
219  if (rc < 0)
220  goto err;
221  }
222 
223  return num;
224 err:
225  i2c_dprintk(2, " ERROR: %i\n", rc);
226  return rc;
227 }
228 
229 static int tm6000_i2c_eeprom(struct tm6000_core *dev)
230 {
231  int i, rc;
232  unsigned char *p = dev->eedata;
233  unsigned char bytes[17];
234 
235  dev->i2c_client.addr = 0xa0 >> 1;
236  dev->eedata_size = 0;
237 
238  bytes[16] = '\0';
239  for (i = 0; i < sizeof(dev->eedata); ) {
240  *p = i;
241  rc = tm6000_i2c_recv_regs(dev, 0xa0, i, p, 1);
242  if (rc < 1) {
243  if (p == dev->eedata)
244  goto noeeprom;
245  else {
246  printk(KERN_WARNING
247  "%s: i2c eeprom read error (err=%d)\n",
248  dev->name, rc);
249  }
250  return -EINVAL;
251  }
252  dev->eedata_size++;
253  p++;
254  if (0 == (i % 16))
255  printk(KERN_INFO "%s: i2c eeprom %02x:", dev->name, i);
256  printk(KERN_CONT " %02x", dev->eedata[i]);
257  if ((dev->eedata[i] >= ' ') && (dev->eedata[i] <= 'z'))
258  bytes[i%16] = dev->eedata[i];
259  else
260  bytes[i%16] = '.';
261 
262  i++;
263 
264  if (0 == (i % 16)) {
265  bytes[16] = '\0';
266  printk(KERN_CONT " %s\n", bytes);
267  }
268  }
269  if (0 != (i%16)) {
270  bytes[i%16] = '\0';
271  for (i %= 16; i < 16; i++)
272  printk(KERN_CONT " ");
273  printk(KERN_CONT " %s\n", bytes);
274  }
275 
276  return 0;
277 
278 noeeprom:
279  printk(KERN_INFO "%s: Huh, no eeprom present (err=%d)?\n",
280  dev->name, rc);
281  return -EINVAL;
282 }
283 
284 /* ----------------------------------------------------------- */
285 
286 /*
287  * functionality()
288  */
289 static u32 functionality(struct i2c_adapter *adap)
290 {
291  return I2C_FUNC_SMBUS_EMUL;
292 }
293 
294 static const struct i2c_algorithm tm6000_algo = {
295  .master_xfer = tm6000_i2c_xfer,
296  .functionality = functionality,
297 };
298 
299 /* ----------------------------------------------------------- */
300 
301 /*
302  * tm6000_i2c_register()
303  * register i2c bus
304  */
305 int tm6000_i2c_register(struct tm6000_core *dev)
306 {
307  int rc;
308 
309  dev->i2c_adap.owner = THIS_MODULE;
310  dev->i2c_adap.algo = &tm6000_algo;
311  dev->i2c_adap.dev.parent = &dev->udev->dev;
312  strlcpy(dev->i2c_adap.name, dev->name, sizeof(dev->i2c_adap.name));
313  dev->i2c_adap.algo_data = dev;
314  i2c_set_adapdata(&dev->i2c_adap, &dev->v4l2_dev);
315  rc = i2c_add_adapter(&dev->i2c_adap);
316  if (rc)
317  return rc;
318 
319  dev->i2c_client.adapter = &dev->i2c_adap;
320  strlcpy(dev->i2c_client.name, "tm6000 internal", I2C_NAME_SIZE);
321  tm6000_i2c_eeprom(dev);
322 
323  return 0;
324 }
325 
326 /*
327  * tm6000_i2c_unregister()
328  * unregister i2c_bus
329  */
330 int tm6000_i2c_unregister(struct tm6000_core *dev)
331 {
332  i2c_del_adapter(&dev->i2c_adap);
333  return 0;
334 }
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