+++ /dev/null
-/*
-
- 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 struct i2c_algo_bit_data __devinitdata 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 (!(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 __devinit 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 __devinit 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));
- memcpy(&btv->i2c_algo, &bttv_i2c_algo_bit_template,
- sizeof(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;
-}
git.samba.org / sfrench / cifs-2.6.git / blobdiff