2 * tm6000-i2c.c - driver for TM5600/TM6000/TM6010 USB video capture devices
4 * Copyright (C) 2006-2007 Mauro Carvalho Chehab <mchehab@infradead.org>
6 * Copyright (C) 2007 Michel Ludwig <michel.ludwig@gmail.com>
7 * - Fix SMBus Read Byte command
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
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.
19 #include <linux/module.h>
20 #include <linux/kernel.h>
21 #include <linux/usb.h>
22 #include <linux/i2c.h>
25 #include "tm6000-regs.h"
26 #include <media/v4l2-common.h>
27 #include <media/tuner.h>
28 #include "tuner-xc2028.h"
31 /* ----------------------------------------------------------- */
33 static unsigned int i2c_debug;
34 module_param(i2c_debug, int, 0644);
35 MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]");
37 #define i2c_dprintk(lvl, fmt, args...) if (i2c_debug >= lvl) do { \
38 printk(KERN_DEBUG "%s at %s: " fmt, \
39 dev->name, __func__, ##args); } while (0)
41 static int tm6000_i2c_send_regs(struct tm6000_core *dev, unsigned char addr,
42 __u8 reg, char *buf, int len)
45 unsigned int i2c_packet_limit = 16;
47 if (dev->dev_type == TM6010)
48 i2c_packet_limit = 80;
53 if (len < 1 || len > i2c_packet_limit) {
54 printk(KERN_ERR "Incorrect length of i2c packet = %d, limit set to %d\n",
55 len, i2c_packet_limit);
60 rc = tm6000_read_write_usb(dev, USB_DIR_OUT | USB_TYPE_VENDOR |
61 USB_RECIP_DEVICE, REQ_16_SET_GET_I2C_WR1_RDN,
62 addr | reg << 8, 0, buf, len);
73 /* Generic read - doesn't work fine with 16bit registers */
74 static int tm6000_i2c_recv_regs(struct tm6000_core *dev, unsigned char addr,
75 __u8 reg, char *buf, int len)
79 unsigned int i2c_packet_limit = 16;
81 if (dev->dev_type == TM6010)
82 i2c_packet_limit = 64;
87 if (len < 1 || len > i2c_packet_limit) {
88 printk(KERN_ERR "Incorrect length of i2c packet = %d, limit set to %d\n",
89 len, i2c_packet_limit);
94 if ((dev->caps.has_zl10353) && (dev->demod_addr << 1 == addr) && (reg % 2 == 0)) {
96 * Workaround an I2C bug when reading from zl10353
101 rc = tm6000_read_write_usb(dev, USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
102 REQ_16_SET_GET_I2C_WR1_RDN, addr | reg << 8, 0, b, len);
106 rc = tm6000_read_write_usb(dev, USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
107 REQ_16_SET_GET_I2C_WR1_RDN, addr | reg << 8, 0, buf, len);
115 * read from a 16bit register
116 * for example xc2028, xc3028 or xc3028L
118 static int tm6000_i2c_recv_regs16(struct tm6000_core *dev, unsigned char addr,
119 __u16 reg, char *buf, int len)
124 if (!buf || len != 2)
128 if (dev->dev_type == TM6010) {
130 rc = tm6000_read_write_usb(dev, USB_DIR_OUT | USB_TYPE_VENDOR |
131 USB_RECIP_DEVICE, REQ_16_SET_GET_I2C_WR1_RDN,
132 addr | (reg & 0xFF00), 0, &ureg, 1);
139 rc = tm6000_read_write_usb(dev, USB_DIR_IN | USB_TYPE_VENDOR |
140 USB_RECIP_DEVICE, REQ_35_AFTEK_TUNER_READ,
143 rc = tm6000_read_write_usb(dev, USB_DIR_IN | USB_TYPE_VENDOR |
144 USB_RECIP_DEVICE, REQ_14_SET_GET_I2C_WR2_RDN,
145 addr, reg, buf, len);
152 static int tm6000_i2c_xfer(struct i2c_adapter *i2c_adap,
153 struct i2c_msg msgs[], int num)
155 struct tm6000_core *dev = i2c_adap->algo_data;
156 int addr, rc, i, byte;
160 for (i = 0; i < num; i++) {
161 addr = (msgs[i].addr << 1) & 0xff;
162 i2c_dprintk(2, "%s %s addr=0x%x len=%d:",
163 (msgs[i].flags & I2C_M_RD) ? "read" : "write",
164 i == num - 1 ? "stop" : "nonstop", addr, msgs[i].len);
165 if (msgs[i].flags & I2C_M_RD) {
166 /* read request without preceding register selection */
168 * The TM6000 only supports a read transaction
169 * immediately after a 1 or 2 byte write to select
170 * a register. We cannot fulfil this request.
172 i2c_dprintk(2, " read without preceding write not supported");
175 } else if (i + 1 < num && msgs[i].len <= 2 &&
176 (msgs[i + 1].flags & I2C_M_RD) &&
177 msgs[i].addr == msgs[i + 1].addr) {
178 /* 1 or 2 byte write followed by a read */
180 for (byte = 0; byte < msgs[i].len; byte++)
181 printk(KERN_CONT " %02x", msgs[i].buf[byte]);
182 i2c_dprintk(2, "; joined to read %s len=%d:",
183 i == num - 2 ? "stop" : "nonstop",
186 if (msgs[i].len == 2) {
187 rc = tm6000_i2c_recv_regs16(dev, addr,
188 msgs[i].buf[0] << 8 | msgs[i].buf[1],
189 msgs[i + 1].buf, msgs[i + 1].len);
191 rc = tm6000_i2c_recv_regs(dev, addr, msgs[i].buf[0],
192 msgs[i + 1].buf, msgs[i + 1].len);
197 if (addr == dev->tuner_addr << 1) {
198 tm6000_set_reg(dev, REQ_50_SET_START, 0, 0);
199 tm6000_set_reg(dev, REQ_51_SET_STOP, 0, 0);
202 for (byte = 0; byte < msgs[i].len; byte++)
203 printk(KERN_CONT " %02x", msgs[i].buf[byte]);
207 for (byte = 0; byte < msgs[i].len; byte++)
208 printk(KERN_CONT " %02x", msgs[i].buf[byte]);
209 rc = tm6000_i2c_send_regs(dev, addr, msgs[i].buf[0],
210 msgs[i].buf + 1, msgs[i].len - 1);
213 printk(KERN_CONT "\n");
220 i2c_dprintk(2, " ERROR: %i\n", rc);
224 static int tm6000_i2c_eeprom(struct tm6000_core *dev)
227 unsigned char *p = dev->eedata;
228 unsigned char bytes[17];
230 dev->i2c_client.addr = 0xa0 >> 1;
231 dev->eedata_size = 0;
234 for (i = 0; i < sizeof(dev->eedata); ) {
236 rc = tm6000_i2c_recv_regs(dev, 0xa0, i, p, 1);
238 if (p == dev->eedata)
242 "%s: i2c eeprom read error (err=%d)\n",
250 printk(KERN_INFO "%s: i2c eeprom %02x:", dev->name, i);
251 printk(KERN_CONT " %02x", dev->eedata[i]);
252 if ((dev->eedata[i] >= ' ') && (dev->eedata[i] <= 'z'))
253 bytes[i%16] = dev->eedata[i];
261 printk(KERN_CONT " %s\n", bytes);
266 for (i %= 16; i < 16; i++)
267 printk(KERN_CONT " ");
268 printk(KERN_CONT " %s\n", bytes);
274 printk(KERN_INFO "%s: Huh, no eeprom present (err=%d)?\n",
279 /* ----------------------------------------------------------- */
284 static u32 functionality(struct i2c_adapter *adap)
286 return I2C_FUNC_SMBUS_EMUL;
289 static const struct i2c_algorithm tm6000_algo = {
290 .master_xfer = tm6000_i2c_xfer,
291 .functionality = functionality,
294 /* ----------------------------------------------------------- */
297 * tm6000_i2c_register()
300 int tm6000_i2c_register(struct tm6000_core *dev)
304 dev->i2c_adap.owner = THIS_MODULE;
305 dev->i2c_adap.algo = &tm6000_algo;
306 dev->i2c_adap.dev.parent = &dev->udev->dev;
307 strlcpy(dev->i2c_adap.name, dev->name, sizeof(dev->i2c_adap.name));
308 dev->i2c_adap.algo_data = dev;
309 i2c_set_adapdata(&dev->i2c_adap, &dev->v4l2_dev);
310 rc = i2c_add_adapter(&dev->i2c_adap);
314 dev->i2c_client.adapter = &dev->i2c_adap;
315 strlcpy(dev->i2c_client.name, "tm6000 internal", I2C_NAME_SIZE);
316 tm6000_i2c_eeprom(dev);
322 * tm6000_i2c_unregister()
325 int tm6000_i2c_unregister(struct tm6000_core *dev)
327 i2c_del_adapter(&dev->i2c_adap);