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fae91e72b7
I2C_DEVNAME and i2c_clientname were introduced in 2.5.68 [1] to help media/video driver authors who wanted their code to be compatible with both Linux 2.4 and 2.6. The cause of the incompatibility has gone since [2], so I think we can get rid of them, as they tend to make the code harder to read and longer to preprocess/compile for no more benefit. I'd hope nobody seriously attempts to keep media/video driver compatible across Linux trees anymore, BTW. [1] http://marc.theaimsgroup.com/?l=linux-kernel&m=104930186524598&w=2 [2] http://www.linuxhq.com/kernel/v2.6/0-test3/include/linux/i2c.h Signed-off-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
473 lines
11 KiB
C
473 lines
11 KiB
C
/*
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$Id: bttv-i2c.c,v 1.25 2005/07/05 17:37:35 nsh Exp $
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bttv-i2c.c -- all the i2c code is here
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bttv - Bt848 frame grabber driver
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Copyright (C) 1996,97,98 Ralph Metzler (rjkm@thp.uni-koeln.de)
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& Marcus Metzler (mocm@thp.uni-koeln.de)
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(c) 1999-2003 Gerd Knorr <kraxel@bytesex.org>
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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 <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/jiffies.h>
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#include <asm/io.h>
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#include "bttvp.h"
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static struct i2c_algo_bit_data bttv_i2c_algo_bit_template;
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static struct i2c_adapter bttv_i2c_adap_sw_template;
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static struct i2c_adapter bttv_i2c_adap_hw_template;
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static struct i2c_client bttv_i2c_client_template;
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static int attach_inform(struct i2c_client *client);
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static int i2c_debug = 0;
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static int i2c_hw = 0;
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static int i2c_scan = 0;
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module_param(i2c_debug, int, 0644);
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module_param(i2c_hw, int, 0444);
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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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/* ----------------------------------------------------------------------- */
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/* I2C functions - bitbanging adapter (software i2c) */
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static void bttv_bit_setscl(void *data, int state)
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{
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struct bttv *btv = (struct bttv*)data;
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if (state)
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btv->i2c_state |= 0x02;
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else
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btv->i2c_state &= ~0x02;
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btwrite(btv->i2c_state, BT848_I2C);
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btread(BT848_I2C);
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}
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static void bttv_bit_setsda(void *data, int state)
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{
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struct bttv *btv = (struct bttv*)data;
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if (state)
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btv->i2c_state |= 0x01;
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else
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btv->i2c_state &= ~0x01;
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btwrite(btv->i2c_state, BT848_I2C);
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btread(BT848_I2C);
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}
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static int bttv_bit_getscl(void *data)
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{
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struct bttv *btv = (struct bttv*)data;
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int state;
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state = btread(BT848_I2C) & 0x02 ? 1 : 0;
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return state;
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}
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static int bttv_bit_getsda(void *data)
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{
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struct bttv *btv = (struct bttv*)data;
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int state;
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state = btread(BT848_I2C) & 0x01;
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return state;
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}
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static struct i2c_algo_bit_data bttv_i2c_algo_bit_template = {
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.setsda = bttv_bit_setsda,
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.setscl = bttv_bit_setscl,
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.getsda = bttv_bit_getsda,
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.getscl = bttv_bit_getscl,
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.udelay = 16,
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.mdelay = 10,
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.timeout = 200,
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};
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static struct i2c_adapter bttv_i2c_adap_sw_template = {
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.owner = THIS_MODULE,
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#ifdef I2C_CLASS_TV_ANALOG
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.class = I2C_CLASS_TV_ANALOG,
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#endif
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.name = "bt848",
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.id = I2C_HW_B_BT848,
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.client_register = attach_inform,
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};
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/* ----------------------------------------------------------------------- */
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/* I2C functions - hardware i2c */
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static int algo_control(struct i2c_adapter *adapter,
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unsigned int cmd, unsigned long arg)
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{
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return 0;
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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;
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}
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static int
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bttv_i2c_wait_done(struct bttv *btv)
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{
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int rc = 0;
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/* timeout */
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if (wait_event_interruptible_timeout(btv->i2c_queue,
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btv->i2c_done, msecs_to_jiffies(85)) == -ERESTARTSYS)
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rc = -EIO;
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if (btv->i2c_done & BT848_INT_RACK)
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rc = 1;
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btv->i2c_done = 0;
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return rc;
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}
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#define I2C_HW (BT878_I2C_MODE | BT848_I2C_SYNC |\
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BT848_I2C_SCL | BT848_I2C_SDA)
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static int
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bttv_i2c_sendbytes(struct bttv *btv, const struct i2c_msg *msg, int last)
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{
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u32 xmit;
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int retval,cnt;
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/* sanity checks */
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if (0 == msg->len)
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return -EINVAL;
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/* start, address + first byte */
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xmit = (msg->addr << 25) | (msg->buf[0] << 16) | I2C_HW;
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if (msg->len > 1 || !last)
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xmit |= BT878_I2C_NOSTOP;
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btwrite(xmit, BT848_I2C);
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retval = bttv_i2c_wait_done(btv);
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if (retval < 0)
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goto err;
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if (retval == 0)
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goto eio;
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if (i2c_debug) {
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printk(" <W %02x %02x", msg->addr << 1, msg->buf[0]);
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if (!(xmit & BT878_I2C_NOSTOP))
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printk(" >\n");
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}
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for (cnt = 1; cnt < msg->len; cnt++ ) {
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/* following bytes */
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xmit = (msg->buf[cnt] << 24) | I2C_HW | BT878_I2C_NOSTART;
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if (cnt < msg->len-1 || !last)
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xmit |= BT878_I2C_NOSTOP;
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btwrite(xmit, BT848_I2C);
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retval = bttv_i2c_wait_done(btv);
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if (retval < 0)
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goto err;
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if (retval == 0)
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goto eio;
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if (i2c_debug) {
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printk(" %02x", msg->buf[cnt]);
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if (!(xmit & BT878_I2C_NOSTOP))
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printk(" >\n");
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}
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}
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return msg->len;
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eio:
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retval = -EIO;
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err:
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if (i2c_debug)
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printk(" ERR: %d\n",retval);
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return retval;
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}
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static int
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bttv_i2c_readbytes(struct bttv *btv, const struct i2c_msg *msg, int last)
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{
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u32 xmit;
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u32 cnt;
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int retval;
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for(cnt = 0; cnt < msg->len; cnt++) {
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xmit = (msg->addr << 25) | (1 << 24) | I2C_HW;
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if (cnt < msg->len-1)
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xmit |= BT848_I2C_W3B;
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if (cnt < msg->len-1 || !last)
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xmit |= BT878_I2C_NOSTOP;
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if (cnt)
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xmit |= BT878_I2C_NOSTART;
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btwrite(xmit, BT848_I2C);
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retval = bttv_i2c_wait_done(btv);
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if (retval < 0)
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goto err;
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if (retval == 0)
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goto eio;
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msg->buf[cnt] = ((u32)btread(BT848_I2C) >> 8) & 0xff;
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if (i2c_debug) {
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if (!(xmit & BT878_I2C_NOSTART))
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printk(" <R %02x", (msg->addr << 1) +1);
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printk(" =%02x", msg->buf[cnt]);
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if (!(xmit & BT878_I2C_NOSTOP))
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printk(" >\n");
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}
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}
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return msg->len;
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eio:
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retval = -EIO;
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err:
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if (i2c_debug)
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printk(" ERR: %d\n",retval);
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return retval;
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}
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static int bttv_i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs, int num)
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{
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struct bttv *btv = i2c_get_adapdata(i2c_adap);
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int retval = 0;
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int i;
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if (i2c_debug)
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printk("bt-i2c:");
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btwrite(BT848_INT_I2CDONE|BT848_INT_RACK, BT848_INT_STAT);
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for (i = 0 ; i < num; i++) {
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if (msgs[i].flags & I2C_M_RD) {
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/* read */
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retval = bttv_i2c_readbytes(btv, &msgs[i], i+1 == num);
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if (retval < 0)
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goto err;
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} else {
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/* write */
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retval = bttv_i2c_sendbytes(btv, &msgs[i], i+1 == num);
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if (retval < 0)
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goto err;
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}
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}
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return num;
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err:
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return retval;
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}
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static struct i2c_algorithm bttv_algo = {
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.master_xfer = bttv_i2c_xfer,
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.algo_control = algo_control,
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.functionality = functionality,
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};
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static struct i2c_adapter bttv_i2c_adap_hw_template = {
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.owner = THIS_MODULE,
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#ifdef I2C_CLASS_TV_ANALOG
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.class = I2C_CLASS_TV_ANALOG,
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#endif
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.name = "bt878",
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.id = I2C_HW_B_BT848 /* FIXME */,
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.algo = &bttv_algo,
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.client_register = attach_inform,
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};
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/* ----------------------------------------------------------------------- */
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/* I2C functions - common stuff */
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static int attach_inform(struct i2c_client *client)
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{
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struct bttv *btv = i2c_get_adapdata(client->adapter);
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if (bttv_debug)
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printk(KERN_DEBUG "bttv%d: %s i2c attach [addr=0x%x,client=%s]\n",
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btv->c.nr,client->driver->name,client->addr,
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client->name);
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if (!client->driver->command)
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return 0;
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if (btv->tuner_type != UNSET) {
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struct tuner_setup tun_setup;
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tun_setup.mode_mask = T_RADIO | T_ANALOG_TV | T_DIGITAL_TV;
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tun_setup.type = btv->tuner_type;
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tun_setup.addr = ADDR_UNSET;
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client->driver->command (client, TUNER_SET_TYPE_ADDR, &tun_setup);
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}
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if (btv->pinnacle_id != UNSET)
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client->driver->command(client,AUDC_CONFIG_PINNACLE,
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&btv->pinnacle_id);
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return 0;
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}
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void bttv_call_i2c_clients(struct bttv *btv, unsigned int cmd, void *arg)
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{
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if (0 != btv->i2c_rc)
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return;
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i2c_clients_command(&btv->c.i2c_adap, cmd, arg);
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}
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static struct i2c_client bttv_i2c_client_template = {
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.name = "bttv internal",
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};
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/* read I2C */
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int bttv_I2CRead(struct bttv *btv, unsigned char addr, char *probe_for)
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{
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unsigned char buffer = 0;
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if (0 != btv->i2c_rc)
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return -1;
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if (bttv_verbose && NULL != probe_for)
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printk(KERN_INFO "bttv%d: i2c: checking for %s @ 0x%02x... ",
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btv->c.nr,probe_for,addr);
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btv->i2c_client.addr = addr >> 1;
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if (1 != i2c_master_recv(&btv->i2c_client, &buffer, 1)) {
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if (NULL != probe_for) {
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if (bttv_verbose)
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printk("not found\n");
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} else
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printk(KERN_WARNING "bttv%d: i2c read 0x%x: error\n",
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btv->c.nr,addr);
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return -1;
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}
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if (bttv_verbose && NULL != probe_for)
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printk("found\n");
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return buffer;
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}
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/* write I2C */
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int bttv_I2CWrite(struct bttv *btv, unsigned char addr, unsigned char b1,
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unsigned char b2, int both)
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{
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unsigned char buffer[2];
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int bytes = both ? 2 : 1;
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if (0 != btv->i2c_rc)
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return -1;
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btv->i2c_client.addr = addr >> 1;
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buffer[0] = b1;
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buffer[1] = b2;
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if (bytes != i2c_master_send(&btv->i2c_client, buffer, bytes))
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return -1;
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return 0;
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}
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/* read EEPROM content */
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void __devinit bttv_readee(struct bttv *btv, unsigned char *eedata, int addr)
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{
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memset(eedata, 0, 256);
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if (0 != btv->i2c_rc)
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return;
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btv->i2c_client.addr = addr >> 1;
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tveeprom_read(&btv->i2c_client, eedata, 256);
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}
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static char *i2c_devs[128] = {
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[ 0x30 >> 1 ] = "IR (hauppauge)",
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[ 0x80 >> 1 ] = "msp34xx",
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[ 0x86 >> 1 ] = "tda9887",
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[ 0xa0 >> 1 ] = "eeprom",
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[ 0xc0 >> 1 ] = "tuner (analog)",
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[ 0xc2 >> 1 ] = "tuner (analog)",
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};
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static void do_i2c_scan(char *name, struct i2c_client *c)
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{
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unsigned char buf;
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int i,rc;
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for (i = 0; i < 128; i++) {
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c->addr = i;
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rc = i2c_master_recv(c,&buf,0);
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if (rc < 0)
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continue;
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printk("%s: i2c scan: found device @ 0x%x [%s]\n",
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name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
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}
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}
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/* init + register i2c algo-bit adapter */
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int __devinit init_bttv_i2c(struct bttv *btv)
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{
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memcpy(&btv->i2c_client, &bttv_i2c_client_template,
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sizeof(bttv_i2c_client_template));
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if (i2c_hw)
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btv->use_i2c_hw = 1;
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if (btv->use_i2c_hw) {
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/* bt878 */
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memcpy(&btv->c.i2c_adap, &bttv_i2c_adap_hw_template,
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sizeof(bttv_i2c_adap_hw_template));
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} else {
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/* bt848 */
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memcpy(&btv->c.i2c_adap, &bttv_i2c_adap_sw_template,
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sizeof(bttv_i2c_adap_sw_template));
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memcpy(&btv->i2c_algo, &bttv_i2c_algo_bit_template,
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sizeof(bttv_i2c_algo_bit_template));
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btv->i2c_algo.data = btv;
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btv->c.i2c_adap.algo_data = &btv->i2c_algo;
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}
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btv->c.i2c_adap.dev.parent = &btv->c.pci->dev;
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snprintf(btv->c.i2c_adap.name, sizeof(btv->c.i2c_adap.name),
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"bt%d #%d [%s]", btv->id, btv->c.nr,
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btv->use_i2c_hw ? "hw" : "sw");
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i2c_set_adapdata(&btv->c.i2c_adap, btv);
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btv->i2c_client.adapter = &btv->c.i2c_adap;
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#ifdef I2C_CLASS_TV_ANALOG
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if (bttv_tvcards[btv->c.type].no_video)
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btv->c.i2c_adap.class &= ~I2C_CLASS_TV_ANALOG;
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if (bttv_tvcards[btv->c.type].has_dvb)
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btv->c.i2c_adap.class |= I2C_CLASS_TV_DIGITAL;
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#endif
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if (btv->use_i2c_hw) {
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btv->i2c_rc = i2c_add_adapter(&btv->c.i2c_adap);
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} else {
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bttv_bit_setscl(btv,1);
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bttv_bit_setsda(btv,1);
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btv->i2c_rc = i2c_bit_add_bus(&btv->c.i2c_adap);
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}
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if (0 == btv->i2c_rc && i2c_scan)
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do_i2c_scan(btv->c.name,&btv->i2c_client);
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return btv->i2c_rc;
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}
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int __devexit fini_bttv_i2c(struct bttv *btv)
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{
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if (0 != btv->i2c_rc)
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return 0;
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|
|
|
if (btv->use_i2c_hw) {
|
|
return i2c_del_adapter(&btv->c.i2c_adap);
|
|
} else {
|
|
return i2c_bit_del_bus(&btv->c.i2c_adap);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Local variables:
|
|
* c-basic-offset: 8
|
|
* End:
|
|
*/
|