![Linus Torvalds](/assets/img/avatar_default.png)
Pull i2c changes from Wolfram Sang: - an arbitration driver. While the driver is quite simple, it caused discussion if we need additional arbitration on top of the one specified in the I2C standard. Conclusion is that I accept a few generic mechanisms, but not very specific ones. - the core lost the detach_adapter() call. It has no users anymore and was in the way for other cleanups. attach_adapter() is sadly still there since there are users waiting to be converted. - the core gained a bus recovery infrastructure. I2C defines a way to recover if the data line is stalled. This mechanism is now in the core and drivers can now pass some data to make use of it. - bigger driver cleanups for designware, s3c2410 - removing superfluous refcounting from drivers - removing Ben Dooks as second maintainer due to inactivity. Thanks for all your work so far, Ben! - bugfixes, feature additions, devicetree fixups, simplifications... * 'i2c/for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux: (38 commits) i2c: xiic: must always write 16-bit words to TX_FIFO i2c: octeon: use HZ in timeout value i2c: octeon: Fix i2c fail problem when a process is terminated by a signal i2c: designware-pci: drop superfluous {get|put}_device i2c: designware-plat: drop superfluous {get|put}_device i2c: davinci: drop superfluous {get|put}_device MAINTAINERS: Ben Dooks is inactive regarding I2C i2c: mux: Add i2c-arb-gpio-challenge 'mux' driver i2c: at91: convert to dma_request_slave_channel_compat() i2c: mxs: do error checking and handling in PIO mode i2c: mxs: remove races in PIO code i2c-designware: switch to use runtime PM autosuspend i2c-designware: use usleep_range() in the busy-loop i2c-designware: enable/disable the controller properly i2c-designware: use dynamic adapter numbering on Lynxpoint i2c-designware-pci: use managed functions pcim_* and devm_* i2c-designware-pci: use dev_err() instead of printk() i2c-designware: move to managed functions (devm_*) i2c: remove CONFIG_HOTPLUG ifdefs i2c: s3c2410: Add SMBus emulation for block read ...
405 lines
9.5 KiB
C
405 lines
9.5 KiB
C
/*
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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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(c) 2005 Mauro Carvalho Chehab <mchehab@infradead.org>
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- Multituner support and i2c address binding
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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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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include "bttvp.h"
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#include <media/v4l2-common.h>
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#include <linux/jiffies.h>
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#include <asm/io.h>
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static int i2c_debug;
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static int i2c_hw;
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static int i2c_scan;
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module_param(i2c_debug, int, 0644);
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MODULE_PARM_DESC(i2c_debug, "configure i2c debug level");
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module_param(i2c_hw, int, 0444);
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MODULE_PARM_DESC(i2c_hw,"force use of hardware i2c support, "
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"instead of software bitbang");
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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_udelay = 5;
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module_param(i2c_udelay, int, 0444);
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MODULE_PARM_DESC(i2c_udelay,"soft i2c delay at insmod time, in usecs "
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"(should be 5 or higher). Lower value means higher bus speed.");
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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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.timeout = 200,
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};
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/* ----------------------------------------------------------------------- */
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/* I2C functions - hardware i2c */
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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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pr_cont(" <W %02x %02x", msg->addr << 1, msg->buf[0]);
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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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pr_cont(" %02x", msg->buf[cnt]);
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}
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if (i2c_debug && !(xmit & BT878_I2C_NOSTOP))
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pr_cont(">\n");
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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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pr_cont(" 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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if (i2c_debug) {
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if (!(xmit & BT878_I2C_NOSTART))
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pr_cont(" <R %02x", (msg->addr << 1) +1);
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}
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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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pr_cont(" =%02x", msg->buf[cnt]);
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}
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if (i2c_debug && !(xmit & BT878_I2C_NOSTOP))
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pr_cont(" >\n");
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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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pr_cont(" 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 v4l2_device *v4l2_dev = i2c_get_adapdata(i2c_adap);
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struct bttv *btv = to_bttv(v4l2_dev);
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int retval = 0;
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int i;
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if (i2c_debug)
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pr_debug("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 const struct i2c_algorithm bttv_algo = {
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.master_xfer = bttv_i2c_xfer,
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.functionality = functionality,
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};
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/* ----------------------------------------------------------------------- */
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/* I2C functions - common stuff */
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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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pr_info("%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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pr_cont("not found\n");
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} else
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pr_warn("%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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pr_cont("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 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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[ 0x1c >> 1 ] = "lgdt330x",
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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 < ARRAY_SIZE(i2c_devs); 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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pr_info("%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 adapter */
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int init_bttv_i2c(struct bttv *btv)
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{
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strlcpy(btv->i2c_client.name, "bttv internal", I2C_NAME_SIZE);
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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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strlcpy(btv->c.i2c_adap.name, "bt878",
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sizeof(btv->c.i2c_adap.name));
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btv->c.i2c_adap.algo = &bttv_algo;
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} else {
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/* bt848 */
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/* Prevents usage of invalid delay values */
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if (i2c_udelay<5)
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i2c_udelay=5;
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strlcpy(btv->c.i2c_adap.name, "bttv",
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sizeof(btv->c.i2c_adap.name));
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btv->i2c_algo = bttv_i2c_algo_bit_template;
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btv->i2c_algo.udelay = i2c_udelay;
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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.owner = THIS_MODULE;
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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->c.v4l2_dev);
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btv->i2c_client.adapter = &btv->c.i2c_adap;
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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.v4l2_dev.name, &btv->i2c_client);
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return btv->i2c_rc;
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}
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int fini_bttv_i2c(struct bttv *btv)
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{
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if (btv->i2c_rc == 0)
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i2c_del_adapter(&btv->c.i2c_adap);
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return 0;
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}
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