linux/drivers/media/usb/cx231xx/cx231xx-i2c.c
Wolfram Sang ada19043e5 media: cx231xx: don't check number of messages in the driver
Since commit 1eace8344c ("i2c: add param sanity check to
i2c_transfer()"), the I2C core does this check now. We can remove it
from drivers.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
2018-07-27 06:39:57 -04:00

610 lines
14 KiB
C

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