--- /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 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;
+}
Code Review / kvmfornfv.git / blobdiff