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75d1e3ef MCC |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | // tm6000-i2c.c - driver for TM5600/TM6000/TM6010 USB video capture devices | |
3 | // | |
32590819 | 4 | // Copyright (c) 2006-2007 Mauro Carvalho Chehab <mchehab@kernel.org> |
75d1e3ef MCC |
5 | // |
6 | // Copyright (c) 2007 Michel Ludwig <michel.ludwig@gmail.com> | |
7 | // - Fix SMBus Read Byte command | |
9701dc94 MCC |
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 | ||
9701dc94 MCC |
21 | /* ----------------------------------------------------------- */ |
22 | ||
d7fe4a60 | 23 | static unsigned int i2c_debug; |
9701dc94 MCC |
24 | module_param(i2c_debug, int, 0644); |
25 | MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]"); | |
26 | ||
52e0a72a | 27 | #define i2c_dprintk(lvl, fmt, args...) if (i2c_debug >= lvl) do { \ |
9701dc94 | 28 | printk(KERN_DEBUG "%s at %s: " fmt, \ |
0f063c68 | 29 | dev->name, __func__, ##args); } while (0) |
9701dc94 | 30 | |
4e11502d SR |
31 | static int tm6000_i2c_send_regs(struct tm6000_core *dev, unsigned char addr, |
32 | __u8 reg, char *buf, int len) | |
33 | { | |
20dead8d | 34 | int rc; |
20dead8d DB |
35 | unsigned int i2c_packet_limit = 16; |
36 | ||
37 | if (dev->dev_type == TM6010) | |
3874cd77 | 38 | i2c_packet_limit = 80; |
20dead8d DB |
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 | ||
20dead8d DB |
59 | /* release mutex */ |
60 | return rc; | |
4e11502d SR |
61 | } |
62 | ||
63 | /* Generic read - doesn't work fine with 16bit registers */ | |
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; | |
02512fe3 | 68 | u8 b[2]; |
20dead8d DB |
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 | } | |
4e11502d | 82 | |
20dead8d | 83 | /* capture mutex */ |
02512fe3 SR |
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, | |
4e11502d | 97 | REQ_16_SET_GET_I2C_WR1_RDN, addr | reg << 8, 0, buf, len); |
02512fe3 | 98 | } |
4e11502d | 99 | |
20dead8d | 100 | /* release mutex */ |
4e11502d SR |
101 | return rc; |
102 | } | |
103 | ||
104 | /* | |
105 | * read from a 16bit register | |
106 | * for example xc2028, xc3028 or xc3028L | |
107 | */ | |
108 | static int tm6000_i2c_recv_regs16(struct tm6000_core *dev, unsigned char addr, | |
109 | __u16 reg, char *buf, int len) | |
110 | { | |
20dead8d DB |
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 | ||
20dead8d DB |
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; | |
4e11502d SR |
140 | } |
141 | ||
9701dc94 MCC |
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 | ||
9701dc94 | 148 | for (i = 0; i < num; i++) { |
e30b9d6c | 149 | addr = (msgs[i].addr << 1) & 0xff; |
52e0a72a | 150 | i2c_dprintk(2, "%s %s addr=0x%x len=%d:", |
9701dc94 MCC |
151 | (msgs[i].flags & I2C_M_RD) ? "read" : "write", |
152 | i == num - 1 ? "stop" : "nonstop", addr, msgs[i].len); | |
427f7fac | 153 | if (msgs[i].flags & I2C_M_RD) { |
e30b9d6c CP |
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 fulfil this request. | |
159 | */ | |
68616504 | 160 | i2c_dprintk(2, " read without preceding write not supported"); |
e30b9d6c CP |
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++) | |
45dbf0db | 169 | printk(KERN_CONT " %02x", msgs[i].buf[byte]); |
e30b9d6c CP |
170 | i2c_dprintk(2, "; joined to read %s len=%d:", |
171 | i == num - 2 ? "stop" : "nonstop", | |
172 | msgs[i + 1].len); | |
4e11502d SR |
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 | ||
cf9e1509 | 183 | i++; |
20cabed4 | 184 | |
685b1229 | 185 | if (addr == dev->tuner_addr << 1) { |
f1434f4e SR |
186 | tm6000_set_reg(dev, REQ_50_SET_START, 0, 0); |
187 | tm6000_set_reg(dev, REQ_51_SET_STOP, 0, 0); | |
20cabed4 | 188 | } |
e30b9d6c CP |
189 | if (i2c_debug >= 2) |
190 | for (byte = 0; byte < msgs[i].len; byte++) | |
45dbf0db | 191 | printk(KERN_CONT " %02x", msgs[i].buf[byte]); |
9701dc94 MCC |
192 | } else { |
193 | /* write bytes */ | |
e30b9d6c | 194 | if (i2c_debug >= 2) |
9701dc94 | 195 | for (byte = 0; byte < msgs[i].len; byte++) |
45dbf0db | 196 | printk(KERN_CONT " %02x", msgs[i].buf[byte]); |
4e11502d | 197 | rc = tm6000_i2c_send_regs(dev, addr, msgs[i].buf[0], |
e30b9d6c | 198 | msgs[i].buf + 1, msgs[i].len - 1); |
9701dc94 | 199 | } |
e30b9d6c | 200 | if (i2c_debug >= 2) |
45dbf0db | 201 | printk(KERN_CONT "\n"); |
9701dc94 MCC |
202 | if (rc < 0) |
203 | goto err; | |
204 | } | |
205 | ||
206 | return num; | |
207 | err: | |
52e0a72a | 208 | i2c_dprintk(2, " ERROR: %i\n", rc); |
9701dc94 MCC |
209 | return rc; |
210 | } | |
211 | ||
792bc09a | 212 | static int tm6000_i2c_eeprom(struct tm6000_core *dev) |
9701dc94 MCC |
213 | { |
214 | int i, rc; | |
792bc09a | 215 | unsigned char *p = dev->eedata; |
9701dc94 MCC |
216 | unsigned char bytes[17]; |
217 | ||
218 | dev->i2c_client.addr = 0xa0 >> 1; | |
792bc09a | 219 | dev->eedata_size = 0; |
9701dc94 | 220 | |
d4e15bcd | 221 | bytes[16] = '\0'; |
792bc09a MCC |
222 | for (i = 0; i < sizeof(dev->eedata); ) { |
223 | *p = i; | |
224 | rc = tm6000_i2c_recv_regs(dev, 0xa0, i, p, 1); | |
d4e15bcd | 225 | if (rc < 1) { |
792bc09a | 226 | if (p == dev->eedata) |
d4e15bcd MCC |
227 | goto noeeprom; |
228 | else { | |
9701dc94 MCC |
229 | printk(KERN_WARNING |
230 | "%s: i2c eeprom read error (err=%d)\n", | |
231 | dev->name, rc); | |
232 | } | |
792bc09a | 233 | return -EINVAL; |
9701dc94 | 234 | } |
792bc09a | 235 | dev->eedata_size++; |
9701dc94 MCC |
236 | p++; |
237 | if (0 == (i % 16)) | |
238 | printk(KERN_INFO "%s: i2c eeprom %02x:", dev->name, i); | |
45dbf0db | 239 | printk(KERN_CONT " %02x", dev->eedata[i]); |
792bc09a MCC |
240 | if ((dev->eedata[i] >= ' ') && (dev->eedata[i] <= 'z')) |
241 | bytes[i%16] = dev->eedata[i]; | |
52e0a72a TT |
242 | else |
243 | bytes[i%16] = '.'; | |
d4e15bcd MCC |
244 | |
245 | i++; | |
246 | ||
247 | if (0 == (i % 16)) { | |
248 | bytes[16] = '\0'; | |
45dbf0db | 249 | printk(KERN_CONT " %s\n", bytes); |
9701dc94 MCC |
250 | } |
251 | } | |
d4e15bcd MCC |
252 | if (0 != (i%16)) { |
253 | bytes[i%16] = '\0'; | |
254 | for (i %= 16; i < 16; i++) | |
45dbf0db MCC |
255 | printk(KERN_CONT " "); |
256 | printk(KERN_CONT " %s\n", bytes); | |
9701dc94 | 257 | } |
d4e15bcd | 258 | |
9701dc94 | 259 | return 0; |
d4e15bcd MCC |
260 | |
261 | noeeprom: | |
262 | printk(KERN_INFO "%s: Huh, no eeprom present (err=%d)?\n", | |
792bc09a MCC |
263 | dev->name, rc); |
264 | return -EINVAL; | |
9701dc94 MCC |
265 | } |
266 | ||
267 | /* ----------------------------------------------------------- */ | |
268 | ||
9701dc94 MCC |
269 | /* |
270 | * functionality() | |
271 | */ | |
272 | static u32 functionality(struct i2c_adapter *adap) | |
273 | { | |
274 | return I2C_FUNC_SMBUS_EMUL; | |
275 | } | |
276 | ||
7bd444ed | 277 | static const struct i2c_algorithm tm6000_algo = { |
9701dc94 | 278 | .master_xfer = tm6000_i2c_xfer, |
9701dc94 MCC |
279 | .functionality = functionality, |
280 | }; | |
281 | ||
9701dc94 MCC |
282 | /* ----------------------------------------------------------- */ |
283 | ||
9701dc94 MCC |
284 | /* |
285 | * tm6000_i2c_register() | |
286 | * register i2c bus | |
287 | */ | |
288 | int tm6000_i2c_register(struct tm6000_core *dev) | |
289 | { | |
7bd444ed | 290 | int rc; |
d4e15bcd | 291 | |
7bd444ed JD |
292 | dev->i2c_adap.owner = THIS_MODULE; |
293 | dev->i2c_adap.algo = &tm6000_algo; | |
9701dc94 | 294 | dev->i2c_adap.dev.parent = &dev->udev->dev; |
c0decac1 | 295 | strscpy(dev->i2c_adap.name, dev->name, sizeof(dev->i2c_adap.name)); |
9701dc94 | 296 | dev->i2c_adap.algo_data = dev; |
7bd444ed JD |
297 | i2c_set_adapdata(&dev->i2c_adap, &dev->v4l2_dev); |
298 | rc = i2c_add_adapter(&dev->i2c_adap); | |
299 | if (rc) | |
300 | return rc; | |
9701dc94 | 301 | |
9701dc94 | 302 | dev->i2c_client.adapter = &dev->i2c_adap; |
c0decac1 | 303 | strscpy(dev->i2c_client.name, "tm6000 internal", I2C_NAME_SIZE); |
792bc09a | 304 | tm6000_i2c_eeprom(dev); |
d4e15bcd | 305 | |
9701dc94 MCC |
306 | return 0; |
307 | } | |
308 | ||
309 | /* | |
310 | * tm6000_i2c_unregister() | |
311 | * unregister i2c_bus | |
312 | */ | |
313 | int tm6000_i2c_unregister(struct tm6000_core *dev) | |
314 | { | |
315 | i2c_del_adapter(&dev->i2c_adap); | |
316 | return 0; | |
317 | } |