1 files changed, 461 insertions, 0 deletions

diff --git a/drivers/media/video/bttv-i2c.c b/drivers/media/video/bttv-i2c.c
new file mode 100644
index 000000000000..e42f1ec13f3e
--- /dev/null
+++ b/drivers/media/video/bttv-i2c.c
@@ -0,0 +1,461 @@
+/*
+    $Id: bttv-i2c.c,v 1.18 2005/02/16 12:14:10 kraxel Exp $
+
+    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>
+
+    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.
+
+*/
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <asm/io.h>
+
+#include "bttvp.h"
+
+static struct i2c_algo_bit_data bttv_i2c_algo_bit_template;
+static struct i2c_adapter bttv_i2c_adap_sw_template;
+static struct i2c_adapter bttv_i2c_adap_hw_template;
+static struct i2c_client bttv_i2c_client_template;
+
+static int attach_inform(struct i2c_client *client);
+
+static int i2c_debug = 0;
+static int i2c_hw = 0;
+static int i2c_scan = 0;
+module_param(i2c_debug, int, 0644);
+module_param(i2c_hw,    int, 0444);
+module_param(i2c_scan,  int, 0444);
+MODULE_PARM_DESC(i2c_scan,"scan i2c bus at insmod time");
+
+/* ----------------------------------------------------------------------- */
+/* 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,
+	.mdelay  = 10,
+	.timeout = 200,
+};
+
+static struct i2c_adapter bttv_i2c_adap_sw_template = {
+	.owner             = THIS_MODULE,
+#ifdef I2C_CLASS_TV_ANALOG
+	.class             = I2C_CLASS_TV_ANALOG,
+#endif
+	I2C_DEVNAME("bt848"),
+	.id                = I2C_HW_B_BT848,
+	.client_register   = attach_inform,
+};
+
+/* ----------------------------------------------------------------------- */
+/* I2C functions - hardware i2c                                            */
+
+static int algo_control(struct i2c_adapter *adapter,
+			unsigned int cmd, unsigned long arg)
+{
+	return 0;
+}
+
+static u32 functionality(struct i2c_adapter *adap)
+{
+	return I2C_FUNC_SMBUS_EMUL;
+}
+
+static int
+bttv_i2c_wait_done(struct bttv *btv)
+{
+	DECLARE_WAITQUEUE(wait, current);
+	int rc = 0;
+
+	add_wait_queue(&btv->i2c_queue, &wait);
+	if (0 == btv->i2c_done)
+		msleep_interruptible(20);
+	remove_wait_queue(&btv->i2c_queue, &wait);
+
+	if (0 == btv->i2c_done)
+		/* timeout */
+		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) {
+		printk(" <W %02x %02x", msg->addr << 1, msg->buf[0]);
+		if (!(xmit & BT878_I2C_NOSTOP))
+			printk(" >\n");
+	}
+
+	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) {
+			printk(" %02x", msg->buf[cnt]);
+			if (!(xmit & BT878_I2C_NOSTOP))
+				printk(" >\n");
+		}
+	}
+	return msg->len;
+
+ eio:
+	retval = -EIO;
+ err:
+	if (i2c_debug)
+		printk(" 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;
+		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) {
+			if (!(xmit & BT878_I2C_NOSTART))
+				printk(" <R %02x", (msg->addr << 1) +1);
+			printk(" =%02x", msg->buf[cnt]);
+			if (!(xmit & BT878_I2C_NOSTOP))
+				printk(" >\n");
+		}
+	}
+	return msg->len;
+
+ eio:
+	retval = -EIO;
+ err:
+	if (i2c_debug)
+		printk(" ERR: %d\n",retval);
+       	return retval;
+}
+
+static int bttv_i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs, int num)
+{
+	struct bttv *btv = i2c_get_adapdata(i2c_adap);
+	int retval = 0;
+	int i;
+
+	if (i2c_debug)
+		printk("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 struct i2c_algorithm bttv_algo = {
+	.name          = "bt878",
+	.id            = I2C_ALGO_BIT | I2C_HW_B_BT848 /* FIXME */,
+	.master_xfer   = bttv_i2c_xfer,
+	.algo_control  = algo_control,
+	.functionality = functionality,
+};
+
+static struct i2c_adapter bttv_i2c_adap_hw_template = {
+	.owner         = THIS_MODULE,
+#ifdef I2C_CLASS_TV_ANALOG
+	.class         = I2C_CLASS_TV_ANALOG,
+#endif
+	I2C_DEVNAME("bt878"),
+	.id            = I2C_ALGO_BIT | I2C_HW_B_BT848 /* FIXME */,
+	.algo          = &bttv_algo,
+	.client_register = attach_inform,
+};
+
+/* ----------------------------------------------------------------------- */
+/* I2C functions - common stuff                                            */
+
+static int attach_inform(struct i2c_client *client)
+{
+        struct bttv *btv = i2c_get_adapdata(client->adapter);
+
+	if (btv->tuner_type != UNSET)
+		bttv_call_i2c_clients(btv,TUNER_SET_TYPE,&btv->tuner_type);
+	if (btv->pinnacle_id != UNSET)
+		bttv_call_i2c_clients(btv,AUDC_CONFIG_PINNACLE,
+				      &btv->pinnacle_id);
+        if (bttv_debug)
+		printk("bttv%d: i2c attach [client=%s]\n",
+		       btv->c.nr, i2c_clientname(client));
+        return 0;
+}
+
+void bttv_call_i2c_clients(struct bttv *btv, unsigned int cmd, void *arg)
+{
+	if (0 != btv->i2c_rc)
+		return;
+	i2c_clients_command(&btv->c.i2c_adap, cmd, arg);
+}
+
+static struct i2c_client bttv_i2c_client_template = {
+	I2C_DEVNAME("bttv internal"),
+};
+
+
+/* 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)
+		printk(KERN_INFO "bttv%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)
+				printk("not found\n");
+		} else
+			printk(KERN_WARNING "bttv%d: i2c read 0x%x: error\n",
+			       btv->c.nr,addr);
+                return -1;
+	}
+	if (bttv_verbose && NULL != probe_for)
+		printk("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)
+{
+	btv->i2c_client.addr = addr >> 1;
+	tveeprom_read(&btv->i2c_client, eedata, 256);
+}
+
+static char *i2c_devs[128] = {
+	[ 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 < 128; i++) {
+		c->addr = i;
+		rc = i2c_master_recv(c,&buf,0);
+		if (rc < 0)
+			continue;
+		printk("%s: i2c scan: found device @ 0x%x  [%s]\n",
+		       name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
+	}
+}
+
+/* init + register i2c algo-bit adapter */
+int __devinit init_bttv_i2c(struct bttv *btv)
+{
+	memcpy(&btv->i2c_client, &bttv_i2c_client_template,
+	       sizeof(bttv_i2c_client_template));
+
+	if (i2c_hw)
+		btv->use_i2c_hw = 1;
+	if (btv->use_i2c_hw) {
+		/* bt878 */
+		memcpy(&btv->c.i2c_adap, &bttv_i2c_adap_hw_template,
+		       sizeof(bttv_i2c_adap_hw_template));
+	} else {
+		/* bt848 */
+		memcpy(&btv->c.i2c_adap, &bttv_i2c_adap_sw_template,
+		       sizeof(bttv_i2c_adap_sw_template));
+		memcpy(&btv->i2c_algo, &bttv_i2c_algo_bit_template,
+		       sizeof(bttv_i2c_algo_bit_template));
+		btv->i2c_algo.data = btv;
+		btv->c.i2c_adap.algo_data = &btv->i2c_algo;
+	}
+
+	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);
+        btv->i2c_client.adapter = &btv->c.i2c_adap;
+
+#ifdef I2C_CLASS_TV_ANALOG
+	if (bttv_tvcards[btv->c.type].no_video)
+		btv->c.i2c_adap.class &= ~I2C_CLASS_TV_ANALOG;
+	if (bttv_tvcards[btv->c.type].has_dvb)
+		btv->c.i2c_adap.class |= I2C_CLASS_TV_DIGITAL;
+#endif
+
+	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.name,&btv->i2c_client);
+	return btv->i2c_rc;
+}
+
+int __devexit fini_bttv_i2c(struct bttv *btv)
+{
+	if (0 != btv->i2c_rc)
+		return 0;
+
+	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:
+ */