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ubuntu-linux-kernel/drivers/media/pci/bt8xx/bttv-i2c.c

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2024-04-01 15:06:58 +00:00
/*
bttv-i2c.c -- all the i2c code is here
bttv - Bt848 frame grabber driver
Copyright (C) 1996,97,98 Ralph Metzler (rjkm@thp.uni-koeln.de)
& Marcus Metzler (mocm@thp.uni-koeln.de)
(c) 1999-2003 Gerd Knorr <kraxel@bytesex.org>
(c) 2005 Mauro Carvalho Chehab <mchehab@infradead.org>
- Multituner support and i2c address binding
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.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/init.h>
#include <linux/delay.h>
#include "bttvp.h"
#include <media/v4l2-common.h>
#include <linux/jiffies.h>
#include <asm/io.h>
static int i2c_debug;
static int i2c_hw;
static int i2c_scan;
module_param(i2c_debug, int, 0644);
MODULE_PARM_DESC(i2c_debug, "configure i2c debug level");
module_param(i2c_hw, int, 0444);
MODULE_PARM_DESC(i2c_hw, "force use of hardware i2c support, instead of software bitbang");
module_param(i2c_scan, int, 0444);
MODULE_PARM_DESC(i2c_scan,"scan i2c bus at insmod time");
static unsigned int i2c_udelay = 5;
module_param(i2c_udelay, int, 0444);
MODULE_PARM_DESC(i2c_udelay, "soft i2c delay at insmod time, in usecs (should be 5 or higher). Lower value means higher bus speed.");
/* ----------------------------------------------------------------------- */
/* I2C functions - bitbanging adapter (software i2c) */
static void bttv_bit_setscl(void *data, int state)
{
struct bttv *btv = (struct bttv*)data;
if (state)
btv->i2c_state |= 0x02;
else
btv->i2c_state &= ~0x02;
btwrite(btv->i2c_state, BT848_I2C);
btread(BT848_I2C);
}
static void bttv_bit_setsda(void *data, int state)
{
struct bttv *btv = (struct bttv*)data;
if (state)
btv->i2c_state |= 0x01;
else
btv->i2c_state &= ~0x01;
btwrite(btv->i2c_state, BT848_I2C);
btread(BT848_I2C);
}
static int bttv_bit_getscl(void *data)
{
struct bttv *btv = (struct bttv*)data;
int state;
state = btread(BT848_I2C) & 0x02 ? 1 : 0;
return state;
}
static int bttv_bit_getsda(void *data)
{
struct bttv *btv = (struct bttv*)data;
int state;
state = btread(BT848_I2C) & 0x01;
return state;
}
static const struct i2c_algo_bit_data bttv_i2c_algo_bit_template = {
.setsda = bttv_bit_setsda,
.setscl = bttv_bit_setscl,
.getsda = bttv_bit_getsda,
.getscl = bttv_bit_getscl,
.udelay = 16,
.timeout = 200,
};
/* ----------------------------------------------------------------------- */
/* I2C functions - hardware i2c */
static u32 functionality(struct i2c_adapter *adap)
{
return I2C_FUNC_SMBUS_EMUL;
}
static int
bttv_i2c_wait_done(struct bttv *btv)
{
int rc = 0;
/* timeout */
if (wait_event_interruptible_timeout(btv->i2c_queue,
btv->i2c_done, msecs_to_jiffies(85)) == -ERESTARTSYS)
rc = -EIO;
if (btv->i2c_done & BT848_INT_RACK)
rc = 1;
btv->i2c_done = 0;
return rc;
}
#define I2C_HW (BT878_I2C_MODE | BT848_I2C_SYNC |\
BT848_I2C_SCL | BT848_I2C_SDA)
static int
bttv_i2c_sendbytes(struct bttv *btv, const struct i2c_msg *msg, int last)
{
u32 xmit;
int retval,cnt;
/* sanity checks */
if (0 == msg->len)
return -EINVAL;
/* start, address + first byte */
xmit = (msg->addr << 25) | (msg->buf[0] << 16) | I2C_HW;
if (msg->len > 1 || !last)
xmit |= BT878_I2C_NOSTOP;
btwrite(xmit, BT848_I2C);
retval = bttv_i2c_wait_done(btv);
if (retval < 0)
goto err;
if (retval == 0)
goto eio;
if (i2c_debug) {
pr_cont(" <W %02x %02x", msg->addr << 1, msg->buf[0]);
}
for (cnt = 1; cnt < msg->len; cnt++ ) {
/* following bytes */
xmit = (msg->buf[cnt] << 24) | I2C_HW | BT878_I2C_NOSTART;
if (cnt < msg->len-1 || !last)
xmit |= BT878_I2C_NOSTOP;
btwrite(xmit, BT848_I2C);
retval = bttv_i2c_wait_done(btv);
if (retval < 0)
goto err;
if (retval == 0)
goto eio;
if (i2c_debug)
pr_cont(" %02x", msg->buf[cnt]);
}
if (i2c_debug && !(xmit & BT878_I2C_NOSTOP))
pr_cont(">\n");
return msg->len;
eio:
retval = -EIO;
err:
if (i2c_debug)
pr_cont(" ERR: %d\n",retval);
return retval;
}
static int
bttv_i2c_readbytes(struct bttv *btv, const struct i2c_msg *msg, int last)
{
u32 xmit;
u32 cnt;
int retval;
for (cnt = 0; cnt < msg->len; cnt++) {
xmit = (msg->addr << 25) | (1 << 24) | I2C_HW;
if (cnt < msg->len-1)
xmit |= BT848_I2C_W3B;
if (cnt < msg->len-1 || !last)
xmit |= BT878_I2C_NOSTOP;
if (cnt)
xmit |= BT878_I2C_NOSTART;
if (i2c_debug) {
if (!(xmit & BT878_I2C_NOSTART))
pr_cont(" <R %02x", (msg->addr << 1) +1);
}
btwrite(xmit, BT848_I2C);
retval = bttv_i2c_wait_done(btv);
if (retval < 0)
goto err;
if (retval == 0)
goto eio;
msg->buf[cnt] = ((u32)btread(BT848_I2C) >> 8) & 0xff;
if (i2c_debug) {
pr_cont(" =%02x", msg->buf[cnt]);
}
if (i2c_debug && !(xmit & BT878_I2C_NOSTOP))
pr_cont(" >\n");
}
return msg->len;
eio:
retval = -EIO;
err:
if (i2c_debug)
pr_cont(" ERR: %d\n",retval);
return retval;
}
static int bttv_i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs, int num)
{
struct v4l2_device *v4l2_dev = i2c_get_adapdata(i2c_adap);
struct bttv *btv = to_bttv(v4l2_dev);
int retval = 0;
int i;
if (i2c_debug)
pr_debug("bt-i2c:");
btwrite(BT848_INT_I2CDONE|BT848_INT_RACK, BT848_INT_STAT);
for (i = 0 ; i < num; i++) {
if (msgs[i].flags & I2C_M_RD) {
/* read */
retval = bttv_i2c_readbytes(btv, &msgs[i], i+1 == num);
if (retval < 0)
goto err;
} else {
/* write */
retval = bttv_i2c_sendbytes(btv, &msgs[i], i+1 == num);
if (retval < 0)
goto err;
}
}
return num;
err:
return retval;
}
static const struct i2c_algorithm bttv_algo = {
.master_xfer = bttv_i2c_xfer,
.functionality = functionality,
};
/* ----------------------------------------------------------------------- */
/* I2C functions - common stuff */
/* read I2C */
int bttv_I2CRead(struct bttv *btv, unsigned char addr, char *probe_for)
{
unsigned char buffer = 0;
if (0 != btv->i2c_rc)
return -1;
if (bttv_verbose && NULL != probe_for)
pr_info("%d: i2c: checking for %s @ 0x%02x... ",
btv->c.nr, probe_for, addr);
btv->i2c_client.addr = addr >> 1;
if (1 != i2c_master_recv(&btv->i2c_client, &buffer, 1)) {
if (NULL != probe_for) {
if (bttv_verbose)
pr_cont("not found\n");
} else
pr_warn("%d: i2c read 0x%x: error\n",
btv->c.nr, addr);
return -1;
}
if (bttv_verbose && NULL != probe_for)
pr_cont("found\n");
return buffer;
}
/* write I2C */
int bttv_I2CWrite(struct bttv *btv, unsigned char addr, unsigned char b1,
unsigned char b2, int both)
{
unsigned char buffer[2];
int bytes = both ? 2 : 1;
if (0 != btv->i2c_rc)
return -1;
btv->i2c_client.addr = addr >> 1;
buffer[0] = b1;
buffer[1] = b2;
if (bytes != i2c_master_send(&btv->i2c_client, buffer, bytes))
return -1;
return 0;
}
/* read EEPROM content */
void bttv_readee(struct bttv *btv, unsigned char *eedata, int addr)
{
memset(eedata, 0, 256);
if (0 != btv->i2c_rc)
return;
btv->i2c_client.addr = addr >> 1;
tveeprom_read(&btv->i2c_client, eedata, 256);
}
static char *i2c_devs[128] = {
[ 0x1c >> 1 ] = "lgdt330x",
[ 0x30 >> 1 ] = "IR (hauppauge)",
[ 0x80 >> 1 ] = "msp34xx",
[ 0x86 >> 1 ] = "tda9887",
[ 0xa0 >> 1 ] = "eeprom",
[ 0xc0 >> 1 ] = "tuner (analog)",
[ 0xc2 >> 1 ] = "tuner (analog)",
};
static void do_i2c_scan(char *name, struct i2c_client *c)
{
unsigned char buf;
int i,rc;
for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) {
c->addr = i;
rc = i2c_master_recv(c,&buf,0);
if (rc < 0)
continue;
pr_info("%s: i2c scan: found device @ 0x%x [%s]\n",
name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
}
}
/* init + register i2c adapter */
int init_bttv_i2c(struct bttv *btv)
{
strlcpy(btv->i2c_client.name, "bttv internal", I2C_NAME_SIZE);
if (i2c_hw)
btv->use_i2c_hw = 1;
if (btv->use_i2c_hw) {
/* bt878 */
strlcpy(btv->c.i2c_adap.name, "bt878",
sizeof(btv->c.i2c_adap.name));
btv->c.i2c_adap.algo = &bttv_algo;
} else {
/* bt848 */
/* Prevents usage of invalid delay values */
if (i2c_udelay<5)
i2c_udelay=5;
strlcpy(btv->c.i2c_adap.name, "bttv",
sizeof(btv->c.i2c_adap.name));
btv->i2c_algo = bttv_i2c_algo_bit_template;
btv->i2c_algo.udelay = i2c_udelay;
btv->i2c_algo.data = btv;
btv->c.i2c_adap.algo_data = &btv->i2c_algo;
}
btv->c.i2c_adap.owner = THIS_MODULE;
btv->c.i2c_adap.dev.parent = &btv->c.pci->dev;
snprintf(btv->c.i2c_adap.name, sizeof(btv->c.i2c_adap.name),
"bt%d #%d [%s]", btv->id, btv->c.nr,
btv->use_i2c_hw ? "hw" : "sw");
i2c_set_adapdata(&btv->c.i2c_adap, &btv->c.v4l2_dev);
btv->i2c_client.adapter = &btv->c.i2c_adap;
if (btv->use_i2c_hw) {
btv->i2c_rc = i2c_add_adapter(&btv->c.i2c_adap);
} else {
bttv_bit_setscl(btv,1);
bttv_bit_setsda(btv,1);
btv->i2c_rc = i2c_bit_add_bus(&btv->c.i2c_adap);
}
if (0 == btv->i2c_rc && i2c_scan)
do_i2c_scan(btv->c.v4l2_dev.name, &btv->i2c_client);
return btv->i2c_rc;
}
int fini_bttv_i2c(struct bttv *btv)
{
if (btv->i2c_rc == 0)
i2c_del_adapter(&btv->c.i2c_adap);
return 0;
}