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
tm6000_i2c_send_regs(struct tm6000_core * dev,unsigned char addr,__u8 reg,char * buf,int len)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 */
tm6000_i2c_recv_regs(struct tm6000_core * dev,unsigned char addr,__u8 reg,char * buf,int len)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 */
tm6000_i2c_recv_regs16(struct tm6000_core * dev,unsigned char addr,__u16 reg,char * buf,int len)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
tm6000_i2c_xfer(struct i2c_adapter * i2c_adap,struct i2c_msg msgs[],int num)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
tm6000_i2c_eeprom(struct tm6000_core * dev)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 */
functionality(struct i2c_adapter * adap)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 */
tm6000_i2c_register(struct tm6000_core * dev)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 */
tm6000_i2c_unregister(struct tm6000_core * dev)330 int tm6000_i2c_unregister(struct tm6000_core *dev)
331 {
332 i2c_del_adapter(&dev->i2c_adap);
333 return 0;
334 }
335