1 // SPDX-License-Identifier: GPL-2.0
2 // tm6000-i2c.c - driver for TM5600/TM6000/TM6010 USB video capture devices
3 //
4 // Copyright (c) 2006-2007 Mauro Carvalho Chehab <mchehab@kernel.org>
5 //
6 // Copyright (c) 2007 Michel Ludwig <michel.ludwig@gmail.com>
7 // - Fix SMBus Read Byte command
8
9 #include <linux/module.h>
10 #include <linux/kernel.h>
11 #include <linux/usb.h>
12 #include <linux/i2c.h>
13
14 #include "tm6000.h"
15 #include "tm6000-regs.h"
16 #include <media/v4l2-common.h>
17 #include <media/tuner.h>
18 #include "tuner-xc2028.h"
19
20
21 /* ----------------------------------------------------------- */
22
23 static unsigned int i2c_debug;
24 module_param(i2c_debug, int, 0644);
25 MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]");
26
27 #define i2c_dprintk(lvl, fmt, args...) if (i2c_debug >= lvl) do { \
28 printk(KERN_DEBUG "%s at %s: " fmt, \
29 dev->name, __func__, ##args); } while (0)
30
tm6000_i2c_send_regs(struct tm6000_core * dev,unsigned char addr,__u8 reg,char * buf,int len)31 static int tm6000_i2c_send_regs(struct tm6000_core *dev, unsigned char addr,
32 __u8 reg, char *buf, int len)
33 {
34 int rc;
35 unsigned int i2c_packet_limit = 16;
36
37 if (dev->dev_type == TM6010)
38 i2c_packet_limit = 80;
39
40 if (!buf)
41 return -1;
42
43 if (len < 1 || len > i2c_packet_limit) {
44 printk(KERN_ERR "Incorrect length of i2c packet = %d, limit set to %d\n",
45 len, i2c_packet_limit);
46 return -1;
47 }
48
49 /* capture mutex */
50 rc = tm6000_read_write_usb(dev, USB_DIR_OUT | USB_TYPE_VENDOR |
51 USB_RECIP_DEVICE, REQ_16_SET_GET_I2C_WR1_RDN,
52 addr | reg << 8, 0, buf, len);
53
54 if (rc < 0) {
55 /* release mutex */
56 return rc;
57 }
58
59 /* release mutex */
60 return rc;
61 }
62
63 /* 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)64 static int tm6000_i2c_recv_regs(struct tm6000_core *dev, unsigned char addr,
65 __u8 reg, char *buf, int len)
66 {
67 int rc;
68 u8 b[2];
69 unsigned int i2c_packet_limit = 16;
70
71 if (dev->dev_type == TM6010)
72 i2c_packet_limit = 64;
73
74 if (!buf)
75 return -1;
76
77 if (len < 1 || len > i2c_packet_limit) {
78 printk(KERN_ERR "Incorrect length of i2c packet = %d, limit set to %d\n",
79 len, i2c_packet_limit);
80 return -1;
81 }
82
83 /* capture mutex */
84 if ((dev->caps.has_zl10353) && (dev->demod_addr << 1 == addr) && (reg % 2 == 0)) {
85 /*
86 * Workaround an I2C bug when reading from zl10353
87 */
88 reg -= 1;
89 len += 1;
90
91 rc = tm6000_read_write_usb(dev, USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
92 REQ_16_SET_GET_I2C_WR1_RDN, addr | reg << 8, 0, b, len);
93
94 *buf = b[1];
95 } else {
96 rc = tm6000_read_write_usb(dev, USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
97 REQ_16_SET_GET_I2C_WR1_RDN, addr | reg << 8, 0, buf, len);
98 }
99
100 /* release mutex */
101 return rc;
102 }
103
104 /*
105 * read from a 16bit register
106 * for example xc2028, xc3028 or xc3028L
107 */
tm6000_i2c_recv_regs16(struct tm6000_core * dev,unsigned char addr,__u16 reg,char * buf,int len)108 static int tm6000_i2c_recv_regs16(struct tm6000_core *dev, unsigned char addr,
109 __u16 reg, char *buf, int len)
110 {
111 int rc;
112 unsigned char ureg;
113
114 if (!buf || len != 2)
115 return -1;
116
117 /* capture mutex */
118 if (dev->dev_type == TM6010) {
119 ureg = reg & 0xFF;
120 rc = tm6000_read_write_usb(dev, USB_DIR_OUT | USB_TYPE_VENDOR |
121 USB_RECIP_DEVICE, REQ_16_SET_GET_I2C_WR1_RDN,
122 addr | (reg & 0xFF00), 0, &ureg, 1);
123
124 if (rc < 0) {
125 /* release mutex */
126 return rc;
127 }
128
129 rc = tm6000_read_write_usb(dev, USB_DIR_IN | USB_TYPE_VENDOR |
130 USB_RECIP_DEVICE, REQ_35_AFTEK_TUNER_READ,
131 reg, 0, buf, len);
132 } else {
133 rc = tm6000_read_write_usb(dev, USB_DIR_IN | USB_TYPE_VENDOR |
134 USB_RECIP_DEVICE, REQ_14_SET_GET_I2C_WR2_RDN,
135 addr, reg, buf, len);
136 }
137
138 /* release mutex */
139 return rc;
140 }
141
tm6000_i2c_xfer(struct i2c_adapter * i2c_adap,struct i2c_msg msgs[],int num)142 static int tm6000_i2c_xfer(struct i2c_adapter *i2c_adap,
143 struct i2c_msg msgs[], int num)
144 {
145 struct tm6000_core *dev = i2c_adap->algo_data;
146 int addr, rc, i, byte;
147
148 for (i = 0; i < num; i++) {
149 addr = (msgs[i].addr << 1) & 0xff;
150 i2c_dprintk(2, "%s %s addr=0x%x len=%d:",
151 (msgs[i].flags & I2C_M_RD) ? "read" : "write",
152 i == num - 1 ? "stop" : "nonstop", addr, msgs[i].len);
153 if (msgs[i].flags & I2C_M_RD) {
154 /* read request without preceding register selection */
155 /*
156 * The TM6000 only supports a read transaction
157 * immediately after a 1 or 2 byte write to select
158 * a register. We cannot fulfill this request.
159 */
160 i2c_dprintk(2, " read without preceding write not supported");
161 rc = -EOPNOTSUPP;
162 goto err;
163 } else if (i + 1 < num && msgs[i].len <= 2 &&
164 (msgs[i + 1].flags & I2C_M_RD) &&
165 msgs[i].addr == msgs[i + 1].addr) {
166 /* 1 or 2 byte write followed by a read */
167 if (i2c_debug >= 2)
168 for (byte = 0; byte < msgs[i].len; byte++)
169 printk(KERN_CONT " %02x", msgs[i].buf[byte]);
170 i2c_dprintk(2, "; joined to read %s len=%d:",
171 i == num - 2 ? "stop" : "nonstop",
172 msgs[i + 1].len);
173
174 if (msgs[i].len == 2) {
175 rc = tm6000_i2c_recv_regs16(dev, addr,
176 msgs[i].buf[0] << 8 | msgs[i].buf[1],
177 msgs[i + 1].buf, msgs[i + 1].len);
178 } else {
179 rc = tm6000_i2c_recv_regs(dev, addr, msgs[i].buf[0],
180 msgs[i + 1].buf, msgs[i + 1].len);
181 }
182
183 i++;
184
185 if (addr == dev->tuner_addr << 1) {
186 tm6000_set_reg(dev, REQ_50_SET_START, 0, 0);
187 tm6000_set_reg(dev, REQ_51_SET_STOP, 0, 0);
188 }
189 if (i2c_debug >= 2)
190 for (byte = 0; byte < msgs[i].len; byte++)
191 printk(KERN_CONT " %02x", msgs[i].buf[byte]);
192 } else {
193 /* write bytes */
194 if (i2c_debug >= 2)
195 for (byte = 0; byte < msgs[i].len; byte++)
196 printk(KERN_CONT " %02x", msgs[i].buf[byte]);
197 rc = tm6000_i2c_send_regs(dev, addr, msgs[i].buf[0],
198 msgs[i].buf + 1, msgs[i].len - 1);
199 }
200 if (i2c_debug >= 2)
201 printk(KERN_CONT "\n");
202 if (rc < 0)
203 goto err;
204 }
205
206 return num;
207 err:
208 i2c_dprintk(2, " ERROR: %i\n", rc);
209 return rc;
210 }
211
tm6000_i2c_eeprom(struct tm6000_core * dev)212 static int tm6000_i2c_eeprom(struct tm6000_core *dev)
213 {
214 int i, rc;
215 unsigned char *p = dev->eedata;
216 unsigned char bytes[17];
217
218 dev->i2c_client.addr = 0xa0 >> 1;
219 dev->eedata_size = 0;
220
221 bytes[16] = '\0';
222 for (i = 0; i < sizeof(dev->eedata); ) {
223 *p = i;
224 rc = tm6000_i2c_recv_regs(dev, 0xa0, i, p, 1);
225 if (rc < 1) {
226 if (p == dev->eedata)
227 goto noeeprom;
228 else {
229 printk(KERN_WARNING
230 "%s: i2c eeprom read error (err=%d)\n",
231 dev->name, rc);
232 }
233 return -EINVAL;
234 }
235 dev->eedata_size++;
236 p++;
237 if (0 == (i % 16))
238 printk(KERN_INFO "%s: i2c eeprom %02x:", dev->name, i);
239 printk(KERN_CONT " %02x", dev->eedata[i]);
240 if ((dev->eedata[i] >= ' ') && (dev->eedata[i] <= 'z'))
241 bytes[i%16] = dev->eedata[i];
242 else
243 bytes[i%16] = '.';
244
245 i++;
246
247 if (0 == (i % 16)) {
248 bytes[16] = '\0';
249 printk(KERN_CONT " %s\n", bytes);
250 }
251 }
252 if (0 != (i%16)) {
253 bytes[i%16] = '\0';
254 for (i %= 16; i < 16; i++)
255 printk(KERN_CONT " ");
256 printk(KERN_CONT " %s\n", bytes);
257 }
258
259 return 0;
260
261 noeeprom:
262 printk(KERN_INFO "%s: Huh, no eeprom present (err=%d)?\n",
263 dev->name, rc);
264 return -EINVAL;
265 }
266
267 /* ----------------------------------------------------------- */
268
269 /*
270 * functionality()
271 */
functionality(struct i2c_adapter * adap)272 static u32 functionality(struct i2c_adapter *adap)
273 {
274 return I2C_FUNC_SMBUS_EMUL;
275 }
276
277 static const struct i2c_algorithm tm6000_algo = {
278 .master_xfer = tm6000_i2c_xfer,
279 .functionality = functionality,
280 };
281
282 /* ----------------------------------------------------------- */
283
284 /*
285 * tm6000_i2c_register()
286 * register i2c bus
287 */
tm6000_i2c_register(struct tm6000_core * dev)288 int tm6000_i2c_register(struct tm6000_core *dev)
289 {
290 int rc;
291
292 dev->i2c_adap.owner = THIS_MODULE;
293 dev->i2c_adap.algo = &tm6000_algo;
294 dev->i2c_adap.dev.parent = &dev->udev->dev;
295 strscpy(dev->i2c_adap.name, dev->name, sizeof(dev->i2c_adap.name));
296 dev->i2c_adap.algo_data = dev;
297 i2c_set_adapdata(&dev->i2c_adap, &dev->v4l2_dev);
298 rc = i2c_add_adapter(&dev->i2c_adap);
299 if (rc)
300 return rc;
301
302 dev->i2c_client.adapter = &dev->i2c_adap;
303 strscpy(dev->i2c_client.name, "tm6000 internal", I2C_NAME_SIZE);
304 tm6000_i2c_eeprom(dev);
305
306 return 0;
307 }
308
309 /*
310 * tm6000_i2c_unregister()
311 * unregister i2c_bus
312 */
tm6000_i2c_unregister(struct tm6000_core * dev)313 int tm6000_i2c_unregister(struct tm6000_core *dev)
314 {
315 i2c_del_adapter(&dev->i2c_adap);
316 return 0;
317 }
318