610 lines
14 KiB
C
610 lines
14 KiB
C
/*
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cx231xx-i2c.c - driver for Conexant Cx23100/101/102 USB video capture devices
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Copyright (C) 2008 <srinivasa.deevi at conexant dot com>
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Based on em28xx driver
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Based on Cx23885 driver
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "cx231xx.h"
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/i2c.h>
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#include <linux/i2c-mux.h>
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#include <media/v4l2-common.h>
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#include <media/tuner.h>
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/* ----------------------------------------------------------- */
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static unsigned int i2c_scan;
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module_param(i2c_scan, int, 0444);
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MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time");
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static unsigned int i2c_debug;
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module_param(i2c_debug, int, 0644);
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MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]");
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#define dprintk1(lvl, fmt, args...) \
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do { \
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if (i2c_debug >= lvl) { \
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printk(fmt, ##args); \
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} \
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} while (0)
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#define dprintk2(lvl, fmt, args...) \
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do { \
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if (i2c_debug >= lvl) { \
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printk(KERN_DEBUG "%s at %s: " fmt, \
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dev->name, __func__ , ##args); \
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} \
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} while (0)
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static inline int get_real_i2c_port(struct cx231xx *dev, int bus_nr)
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{
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if (bus_nr == 1)
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return dev->port_3_switch_enabled ? I2C_1_MUX_3 : I2C_1_MUX_1;
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return bus_nr;
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}
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static inline bool is_tuner(struct cx231xx *dev, struct cx231xx_i2c *bus,
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const struct i2c_msg *msg, int tuner_type)
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{
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int i2c_port = get_real_i2c_port(dev, bus->nr);
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if (i2c_port != dev->board.tuner_i2c_master)
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return false;
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if (msg->addr != dev->board.tuner_addr)
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return false;
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if (dev->tuner_type != tuner_type)
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return false;
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return true;
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}
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/*
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* cx231xx_i2c_send_bytes()
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*/
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static int cx231xx_i2c_send_bytes(struct i2c_adapter *i2c_adap,
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const struct i2c_msg *msg)
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{
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struct cx231xx_i2c *bus = i2c_adap->algo_data;
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struct cx231xx *dev = bus->dev;
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struct cx231xx_i2c_xfer_data req_data;
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int status = 0;
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u16 size = 0;
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u8 loop = 0;
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u8 saddr_len = 1;
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u8 *buf_ptr = NULL;
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u16 saddr = 0;
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u8 need_gpio = 0;
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if (is_tuner(dev, bus, msg, TUNER_XC5000)) {
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size = msg->len;
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if (size == 2) { /* register write sub addr */
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/* Just writing sub address will cause problem
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* to XC5000. So ignore the request */
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return 0;
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} else if (size == 4) { /* register write with sub addr */
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if (msg->len >= 2)
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saddr = msg->buf[0] << 8 | msg->buf[1];
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else if (msg->len == 1)
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saddr = msg->buf[0];
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switch (saddr) {
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case 0x0000: /* start tuner calibration mode */
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need_gpio = 1;
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/* FW Loading is done */
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dev->xc_fw_load_done = 1;
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break;
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case 0x000D: /* Set signal source */
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case 0x0001: /* Set TV standard - Video */
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case 0x0002: /* Set TV standard - Audio */
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case 0x0003: /* Set RF Frequency */
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need_gpio = 1;
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break;
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default:
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if (dev->xc_fw_load_done)
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need_gpio = 1;
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break;
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}
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if (need_gpio) {
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dprintk1(1,
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"GPIO WRITE: addr 0x%x, len %d, saddr 0x%x\n",
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msg->addr, msg->len, saddr);
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return dev->cx231xx_gpio_i2c_write(dev,
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msg->addr,
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msg->buf,
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msg->len);
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}
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}
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/* special case for Xc5000 tuner case */
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saddr_len = 1;
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/* adjust the length to correct length */
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size -= saddr_len;
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buf_ptr = (u8 *) (msg->buf + 1);
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do {
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/* prepare xfer_data struct */
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req_data.dev_addr = msg->addr;
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req_data.direction = msg->flags;
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req_data.saddr_len = saddr_len;
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req_data.saddr_dat = msg->buf[0];
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req_data.buf_size = size > 16 ? 16 : size;
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req_data.p_buffer = (u8 *) (buf_ptr + loop * 16);
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bus->i2c_nostop = (size > 16) ? 1 : 0;
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bus->i2c_reserve = (loop == 0) ? 0 : 1;
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/* usb send command */
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status = dev->cx231xx_send_usb_command(bus, &req_data);
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loop++;
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if (size >= 16)
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size -= 16;
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else
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size = 0;
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} while (size > 0);
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bus->i2c_nostop = 0;
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bus->i2c_reserve = 0;
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} else { /* regular case */
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/* prepare xfer_data struct */
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req_data.dev_addr = msg->addr;
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req_data.direction = msg->flags;
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req_data.saddr_len = 0;
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req_data.saddr_dat = 0;
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req_data.buf_size = msg->len;
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req_data.p_buffer = msg->buf;
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/* usb send command */
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status = dev->cx231xx_send_usb_command(bus, &req_data);
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}
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return status < 0 ? status : 0;
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}
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/*
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* cx231xx_i2c_recv_bytes()
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* read a byte from the i2c device
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*/
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static int cx231xx_i2c_recv_bytes(struct i2c_adapter *i2c_adap,
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const struct i2c_msg *msg)
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{
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struct cx231xx_i2c *bus = i2c_adap->algo_data;
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struct cx231xx *dev = bus->dev;
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struct cx231xx_i2c_xfer_data req_data;
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int status = 0;
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u16 saddr = 0;
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u8 need_gpio = 0;
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if (is_tuner(dev, bus, msg, TUNER_XC5000)) {
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if (msg->len == 2)
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saddr = msg->buf[0] << 8 | msg->buf[1];
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else if (msg->len == 1)
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saddr = msg->buf[0];
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if (dev->xc_fw_load_done) {
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switch (saddr) {
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case 0x0009: /* BUSY check */
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dprintk1(1,
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"GPIO R E A D: Special case BUSY check \n");
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/*Try read BUSY register, just set it to zero*/
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msg->buf[0] = 0;
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if (msg->len == 2)
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msg->buf[1] = 0;
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return 0;
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case 0x0004: /* read Lock status */
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need_gpio = 1;
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break;
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}
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if (need_gpio) {
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/* this is a special case to handle Xceive tuner
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clock stretch issue with gpio based I2C */
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dprintk1(1,
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"GPIO R E A D: addr 0x%x, len %d, saddr 0x%x\n",
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msg->addr, msg->len,
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msg->buf[0] << 8 | msg->buf[1]);
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status =
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dev->cx231xx_gpio_i2c_write(dev, msg->addr,
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msg->buf,
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msg->len);
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status =
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dev->cx231xx_gpio_i2c_read(dev, msg->addr,
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msg->buf,
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msg->len);
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return status;
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}
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}
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/* prepare xfer_data struct */
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req_data.dev_addr = msg->addr;
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req_data.direction = msg->flags;
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req_data.saddr_len = msg->len;
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req_data.saddr_dat = msg->buf[0] << 8 | msg->buf[1];
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req_data.buf_size = msg->len;
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req_data.p_buffer = msg->buf;
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/* usb send command */
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status = dev->cx231xx_send_usb_command(bus, &req_data);
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} else {
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/* prepare xfer_data struct */
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req_data.dev_addr = msg->addr;
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req_data.direction = msg->flags;
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req_data.saddr_len = 0;
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req_data.saddr_dat = 0;
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req_data.buf_size = msg->len;
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req_data.p_buffer = msg->buf;
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/* usb send command */
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status = dev->cx231xx_send_usb_command(bus, &req_data);
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}
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return status < 0 ? status : 0;
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}
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/*
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* cx231xx_i2c_recv_bytes_with_saddr()
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* read a byte from the i2c device
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*/
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static int cx231xx_i2c_recv_bytes_with_saddr(struct i2c_adapter *i2c_adap,
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const struct i2c_msg *msg1,
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const struct i2c_msg *msg2)
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{
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struct cx231xx_i2c *bus = i2c_adap->algo_data;
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struct cx231xx *dev = bus->dev;
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struct cx231xx_i2c_xfer_data req_data;
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int status = 0;
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u16 saddr = 0;
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u8 need_gpio = 0;
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if (msg1->len == 2)
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saddr = msg1->buf[0] << 8 | msg1->buf[1];
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else if (msg1->len == 1)
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saddr = msg1->buf[0];
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if (is_tuner(dev, bus, msg2, TUNER_XC5000)) {
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if ((msg2->len < 16)) {
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dprintk1(1,
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"i2c_read: addr 0x%x, len %d, saddr 0x%x, len %d\n",
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msg2->addr, msg2->len, saddr, msg1->len);
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switch (saddr) {
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case 0x0008: /* read FW load status */
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need_gpio = 1;
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break;
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case 0x0004: /* read Lock status */
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need_gpio = 1;
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break;
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}
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if (need_gpio) {
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status =
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dev->cx231xx_gpio_i2c_write(dev, msg1->addr,
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msg1->buf,
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msg1->len);
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status =
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dev->cx231xx_gpio_i2c_read(dev, msg2->addr,
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msg2->buf,
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msg2->len);
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return status;
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}
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}
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}
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/* prepare xfer_data struct */
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req_data.dev_addr = msg2->addr;
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req_data.direction = msg2->flags;
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req_data.saddr_len = msg1->len;
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req_data.saddr_dat = saddr;
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req_data.buf_size = msg2->len;
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req_data.p_buffer = msg2->buf;
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/* usb send command */
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status = dev->cx231xx_send_usb_command(bus, &req_data);
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return status < 0 ? status : 0;
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}
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/*
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* cx231xx_i2c_check_for_device()
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* check if there is a i2c_device at the supplied address
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*/
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static int cx231xx_i2c_check_for_device(struct i2c_adapter *i2c_adap,
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const struct i2c_msg *msg)
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{
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struct cx231xx_i2c *bus = i2c_adap->algo_data;
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struct cx231xx *dev = bus->dev;
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struct cx231xx_i2c_xfer_data req_data;
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int status = 0;
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u8 buf[1];
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/* prepare xfer_data struct */
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req_data.dev_addr = msg->addr;
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req_data.direction = I2C_M_RD;
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req_data.saddr_len = 0;
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req_data.saddr_dat = 0;
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req_data.buf_size = 1;
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req_data.p_buffer = buf;
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/* usb send command */
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status = dev->cx231xx_send_usb_command(bus, &req_data);
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return status < 0 ? status : 0;
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}
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/*
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* cx231xx_i2c_xfer()
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* the main i2c transfer function
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*/
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static int cx231xx_i2c_xfer(struct i2c_adapter *i2c_adap,
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struct i2c_msg msgs[], int num)
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{
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struct cx231xx_i2c *bus = i2c_adap->algo_data;
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struct cx231xx *dev = bus->dev;
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int addr, rc, i, byte;
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mutex_lock(&dev->i2c_lock);
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for (i = 0; i < num; i++) {
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addr = msgs[i].addr;
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dprintk2(2, "%s %s addr=0x%x len=%d:",
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(msgs[i].flags & I2C_M_RD) ? "read" : "write",
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i == num - 1 ? "stop" : "nonstop", addr, msgs[i].len);
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if (!msgs[i].len) {
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/* no len: check only for device presence */
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rc = cx231xx_i2c_check_for_device(i2c_adap, &msgs[i]);
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if (rc < 0) {
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dprintk2(2, " no device\n");
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mutex_unlock(&dev->i2c_lock);
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return rc;
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}
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} else if (msgs[i].flags & I2C_M_RD) {
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/* read bytes */
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rc = cx231xx_i2c_recv_bytes(i2c_adap, &msgs[i]);
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if (i2c_debug >= 2) {
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for (byte = 0; byte < msgs[i].len; byte++)
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printk(KERN_CONT " %02x", msgs[i].buf[byte]);
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}
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} else if (i + 1 < num && (msgs[i + 1].flags & I2C_M_RD) &&
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msgs[i].addr == msgs[i + 1].addr
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&& (msgs[i].len <= 2) && (bus->nr < 3)) {
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/* write bytes */
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if (i2c_debug >= 2) {
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for (byte = 0; byte < msgs[i].len; byte++)
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printk(KERN_CONT " %02x", msgs[i].buf[byte]);
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printk(KERN_CONT "\n");
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}
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/* read bytes */
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dprintk2(2, "plus %s %s addr=0x%x len=%d:",
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(msgs[i+1].flags & I2C_M_RD) ? "read" : "write",
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i+1 == num - 1 ? "stop" : "nonstop", addr, msgs[i+1].len);
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rc = cx231xx_i2c_recv_bytes_with_saddr(i2c_adap,
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&msgs[i],
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&msgs[i + 1]);
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if (i2c_debug >= 2) {
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for (byte = 0; byte < msgs[i+1].len; byte++)
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printk(KERN_CONT " %02x", msgs[i+1].buf[byte]);
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}
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i++;
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} else {
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/* write bytes */
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if (i2c_debug >= 2) {
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for (byte = 0; byte < msgs[i].len; byte++)
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printk(KERN_CONT " %02x", msgs[i].buf[byte]);
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}
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rc = cx231xx_i2c_send_bytes(i2c_adap, &msgs[i]);
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}
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if (rc < 0)
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goto err;
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if (i2c_debug >= 2)
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printk(KERN_CONT "\n");
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}
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mutex_unlock(&dev->i2c_lock);
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return num;
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err:
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dprintk2(2, " ERROR: %i\n", rc);
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mutex_unlock(&dev->i2c_lock);
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return rc;
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}
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/* ----------------------------------------------------------- */
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/*
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* functionality()
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*/
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static u32 functionality(struct i2c_adapter *adap)
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{
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return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_I2C;
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}
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static const struct i2c_algorithm cx231xx_algo = {
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.master_xfer = cx231xx_i2c_xfer,
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.functionality = functionality,
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};
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static const struct i2c_adapter cx231xx_adap_template = {
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.owner = THIS_MODULE,
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.name = "cx231xx",
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.algo = &cx231xx_algo,
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};
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/* ----------------------------------------------------------- */
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/*
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* i2c_devs
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* incomplete list of known devices
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*/
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static const char *i2c_devs[128] = {
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[0x20 >> 1] = "demod",
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[0x60 >> 1] = "colibri",
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[0x88 >> 1] = "hammerhead",
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[0x8e >> 1] = "CIR",
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[0x32 >> 1] = "GeminiIII",
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[0x02 >> 1] = "Aquarius",
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[0xa0 >> 1] = "eeprom",
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[0xc0 >> 1] = "tuner",
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[0xc2 >> 1] = "tuner",
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};
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/*
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* cx231xx_do_i2c_scan()
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* check i2c address range for devices
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*/
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void cx231xx_do_i2c_scan(struct cx231xx *dev, int i2c_port)
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{
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unsigned char buf;
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int i, rc;
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struct i2c_adapter *adap;
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struct i2c_msg msg = {
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.flags = I2C_M_RD,
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.len = 1,
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.buf = &buf,
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};
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if (!i2c_scan)
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return;
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/* Don't generate I2C errors during scan */
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dev->i2c_scan_running = true;
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adap = cx231xx_get_i2c_adap(dev, i2c_port);
|
|
|
|
for (i = 0; i < 128; i++) {
|
|
msg.addr = i;
|
|
rc = i2c_transfer(adap, &msg, 1);
|
|
|
|
if (rc < 0)
|
|
continue;
|
|
dev_info(dev->dev,
|
|
"i2c scan: found device @ port %d addr 0x%x [%s]\n",
|
|
i2c_port,
|
|
i << 1,
|
|
i2c_devs[i] ? i2c_devs[i] : "???");
|
|
}
|
|
|
|
dev->i2c_scan_running = false;
|
|
}
|
|
|
|
/*
|
|
* cx231xx_i2c_register()
|
|
* register i2c bus
|
|
*/
|
|
int cx231xx_i2c_register(struct cx231xx_i2c *bus)
|
|
{
|
|
struct cx231xx *dev = bus->dev;
|
|
|
|
BUG_ON(!dev->cx231xx_send_usb_command);
|
|
|
|
bus->i2c_adap = cx231xx_adap_template;
|
|
bus->i2c_adap.dev.parent = dev->dev;
|
|
|
|
snprintf(bus->i2c_adap.name, sizeof(bus->i2c_adap.name), "%s-%d", bus->dev->name, bus->nr);
|
|
|
|
bus->i2c_adap.algo_data = bus;
|
|
i2c_set_adapdata(&bus->i2c_adap, &dev->v4l2_dev);
|
|
bus->i2c_rc = i2c_add_adapter(&bus->i2c_adap);
|
|
|
|
if (0 != bus->i2c_rc)
|
|
dev_warn(dev->dev,
|
|
"i2c bus %d register FAILED\n", bus->nr);
|
|
|
|
return bus->i2c_rc;
|
|
}
|
|
|
|
/*
|
|
* cx231xx_i2c_unregister()
|
|
* unregister i2c_bus
|
|
*/
|
|
void cx231xx_i2c_unregister(struct cx231xx_i2c *bus)
|
|
{
|
|
if (!bus->i2c_rc)
|
|
i2c_del_adapter(&bus->i2c_adap);
|
|
}
|
|
|
|
/*
|
|
* cx231xx_i2c_mux_select()
|
|
* switch i2c master number 1 between port1 and port3
|
|
*/
|
|
static int cx231xx_i2c_mux_select(struct i2c_mux_core *muxc, u32 chan_id)
|
|
{
|
|
struct cx231xx *dev = i2c_mux_priv(muxc);
|
|
|
|
return cx231xx_enable_i2c_port_3(dev, chan_id);
|
|
}
|
|
|
|
int cx231xx_i2c_mux_create(struct cx231xx *dev)
|
|
{
|
|
dev->muxc = i2c_mux_alloc(&dev->i2c_bus[1].i2c_adap, dev->dev, 2, 0, 0,
|
|
cx231xx_i2c_mux_select, NULL);
|
|
if (!dev->muxc)
|
|
return -ENOMEM;
|
|
dev->muxc->priv = dev;
|
|
return 0;
|
|
}
|
|
|
|
int cx231xx_i2c_mux_register(struct cx231xx *dev, int mux_no)
|
|
{
|
|
return i2c_mux_add_adapter(dev->muxc,
|
|
0,
|
|
mux_no /* chan_id */,
|
|
0 /* class */);
|
|
}
|
|
|
|
void cx231xx_i2c_mux_unregister(struct cx231xx *dev)
|
|
{
|
|
i2c_mux_del_adapters(dev->muxc);
|
|
}
|
|
|
|
struct i2c_adapter *cx231xx_get_i2c_adap(struct cx231xx *dev, int i2c_port)
|
|
{
|
|
switch (i2c_port) {
|
|
case I2C_0:
|
|
return &dev->i2c_bus[0].i2c_adap;
|
|
case I2C_1:
|
|
return &dev->i2c_bus[1].i2c_adap;
|
|
case I2C_2:
|
|
return &dev->i2c_bus[2].i2c_adap;
|
|
case I2C_1_MUX_1:
|
|
return dev->muxc->adapter[0];
|
|
case I2C_1_MUX_3:
|
|
return dev->muxc->adapter[1];
|
|
default:
|
|
BUG();
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(cx231xx_get_i2c_adap);
|