1 files changed, 375 insertions, 0 deletions
diff --git a/drivers/media/video/cx23885/cx23885-i2c.c b/drivers/media/video/cx23885/cx23885-i2c.c
new file mode 100644
index 00000000000..6f5e207c11a
--- /dev/null
+++ b/drivers/media/video/cx23885/cx23885-i2c.c
@@ -0,0 +1,375 @@
+/*
+ *  Driver for the Conexant CX23885 PCIe bridge
+ *
+ *  Copyright (c) 2006 Steven Toth <stoth@hauppauge.com>
+ *
+ *  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 "cx23885.h"
+
+#include <media/v4l2-common.h>
+
+static unsigned int i2c_debug = 2;
+module_param(i2c_debug, int, 0644);
+MODULE_PARM_DESC(i2c_debug,"enable debug messages [i2c]");
+
+static unsigned int i2c_scan = 0;
+module_param(i2c_scan, int, 0444);
+MODULE_PARM_DESC(i2c_scan,"scan i2c bus at insmod time");
+
+#define dprintk(level,fmt, arg...)	if (i2c_debug >= level) \
+	printk(KERN_DEBUG "%s: " fmt, dev->name , ## arg)
+
+#define I2C_WAIT_DELAY 32
+#define I2C_WAIT_RETRY 64
+
+#define I2C_EXTEND  (1 << 3)
+#define I2C_NOSTOP  (1 << 4)
+
+static inline int i2c_slave_did_ack(struct i2c_adapter *i2c_adap)
+{
+	struct cx23885_i2c *bus = i2c_adap->algo_data;
+	struct cx23885_dev *dev = bus->dev;
+	return cx_read(bus->reg_stat) & 0x01;
+}
+
+static inline int i2c_is_busy(struct i2c_adapter *i2c_adap)
+{
+	struct cx23885_i2c *bus = i2c_adap->algo_data;
+	struct cx23885_dev *dev = bus->dev;
+	return cx_read(bus->reg_stat) & 0x02 ? 1 : 0;
+}
+
+static int i2c_wait_done(struct i2c_adapter *i2c_adap)
+{
+	int count;
+
+	for (count = 0; count < I2C_WAIT_RETRY; count++) {
+		if (!i2c_is_busy(i2c_adap))
+			break;
+		udelay(I2C_WAIT_DELAY);
+	}
+
+	if (I2C_WAIT_RETRY == count)
+		return 0;
+
+	return 1;
+}
+
+static int i2c_sendbytes(struct i2c_adapter *i2c_adap, const struct i2c_msg *msg, int last)
+{
+	struct cx23885_i2c *bus = i2c_adap->algo_data;
+	struct cx23885_dev *dev = bus->dev;
+	u32 wdata, addr, ctrl;
+	int retval, cnt;
+
+	dprintk(1, "%s()\n", __FUNCTION__);
+	/* Deal with i2c probe functions with zero payload */
+	if (msg->len == 0) {
+		cx_write(bus->reg_addr, msg->addr << 25);
+		cx_write(bus->reg_ctrl, bus->i2c_period | (1 << 2));
+		if (!i2c_wait_done(i2c_adap))
+			return -EIO;
+		if (!i2c_slave_did_ack(i2c_adap))
+			return -EIO;
+
+		dprintk(1, "%s() returns 0\n", __FUNCTION__);
+		return 0;
+	}
+
+
+	/* dev, reg + first byte */
+	addr = (msg->addr << 25) | msg->buf[0];
+	wdata = msg->buf[0];
+	ctrl = bus->i2c_period | (1 << 12) | (1 << 2);
+
+	if (msg->len > 1)
+		ctrl |= I2C_NOSTOP | I2C_EXTEND;
+
+	cx_write(bus->reg_addr, addr);
+	cx_write(bus->reg_wdata, wdata);
+	cx_write(bus->reg_ctrl, ctrl);
+
+	retval = i2c_wait_done(i2c_adap);
+	if (retval < 0)
+		goto err;
+	if (retval == 0)
+		goto eio;
+	if (i2c_debug) {
+		printk(" <W %02x %02x", msg->addr << 1, msg->buf[0]);
+		if (!(ctrl & I2C_NOSTOP))
+			printk(" >\n");
+	}
+
+	for (cnt = 1; cnt < msg->len; cnt++ ) {
+		/* following bytes */
+		wdata = msg->buf[cnt];
+		ctrl = bus->i2c_period | (1 << 12) | (1 << 2);
+
+		if (cnt < msg->len-1 || !last)
+			ctrl |= I2C_NOSTOP | I2C_EXTEND;
+
+		//printk("addr = 0x%08x  wdata = 0x%08x  ctrl = 0x%08x\n", addr, wdata, ctrl);
+		cx_write(bus->reg_addr, addr);
+		cx_write(bus->reg_wdata, wdata);
+		cx_write(bus->reg_ctrl, ctrl);
+
+		retval = i2c_wait_done(i2c_adap);
+		if (retval < 0)
+			goto err;
+		if (retval == 0)
+			goto eio;
+		if (i2c_debug) {
+			printk(" %02x", msg->buf[cnt]);
+			if (!(ctrl & I2C_NOSTOP))
+				printk(" >\n");
+		}
+	}
+	return msg->len;
+
+ eio:
+	retval = -EIO;
+ err:
+	printk(" ERR: %d\n",retval);
+	return retval;
+}
+
+static int i2c_readbytes(struct i2c_adapter *i2c_adap, const struct i2c_msg *msg, int last)
+{
+	struct cx23885_i2c *bus = i2c_adap->algo_data;
+	struct cx23885_dev *dev = bus->dev;
+	u32 ctrl, cnt;
+	int retval;
+
+	dprintk(1, "%s()\n", __FUNCTION__);
+
+	/* Deal with i2c probe functions with zero payload */
+	if (msg->len == 0) {
+		cx_write(bus->reg_addr, msg->addr << 25);
+		cx_write(bus->reg_ctrl, bus->i2c_period | (1 << 2) | 1);
+		if (!i2c_wait_done(i2c_adap))
+			return -EIO;
+		if (!i2c_slave_did_ack(i2c_adap))
+			return -EIO;
+
+
+		dprintk(1, "%s() returns 0\n", __FUNCTION__);
+		return 0;
+	}
+
+	for(cnt = 0; cnt < msg->len; cnt++) {
+
+		ctrl = bus->i2c_period | (1 << 12) | (1 << 2) | 1;
+
+		if (cnt < msg->len-1 || !last)
+			ctrl |= I2C_NOSTOP | I2C_EXTEND;
+
+		cx_write(bus->reg_addr, msg->addr << 25);
+		cx_write(bus->reg_ctrl, ctrl);
+
+		retval = i2c_wait_done(i2c_adap);
+		if (retval < 0)
+			goto err;
+		if (retval == 0)
+			goto eio;
+		msg->buf[cnt] = cx_read(bus->reg_rdata) & 0xff;
+		if (i2c_debug) {
+			if (!(ctrl & I2C_NOSTOP))
+				printk(" <R %02x", (msg->addr << 1) +1);
+			printk(" =%02x", msg->buf[cnt]);
+			if (!(ctrl & I2C_NOSTOP))
+				printk(" >\n");
+		}
+	}
+	return msg->len;
+
+ eio:
+	retval = -EIO;
+ err:
+	printk(" ERR: %d\n",retval);
+	return retval;
+}
+
+static int i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs, int num)
+{
+	struct cx23885_i2c *bus = i2c_adap->algo_data;
+	struct cx23885_dev *dev = bus->dev;
+	int i, retval = 0;
+
+	dprintk(1, "%s(num = %d)\n", __FUNCTION__, num);
+
+	for (i = 0 ; i < num; i++) {
+		dprintk(1, "%s(num = %d) addr = 0x%02x  len = 0x%x\n"
+			, __FUNCTION__, num, msgs[i].addr, msgs[i].len);
+		if (msgs[i].flags & I2C_M_RD) {
+			/* read */
+			retval = i2c_readbytes(i2c_adap, &msgs[i], i+1 == num);
+			if (retval < 0)
+				goto err;
+		} else {
+			/* write */
+			retval = i2c_sendbytes(i2c_adap, &msgs[i], i+1 == num);
+			if (retval < 0)
+				goto err;
+		}
+	}
+	return num;
+
+ err:
+	return retval;
+}
+
+static int attach_inform(struct i2c_client *client)
+{
+	struct cx23885_dev *dev = i2c_get_adapdata(client->adapter);
+
+	dprintk(1, "%s i2c attach [addr=0x%x,client=%s]\n",
+		client->driver->driver.name, client->addr, client->name);
+
+	if (!client->driver->command)
+		return 0;
+
+	return 0;
+}
+
+static int detach_inform(struct i2c_client *client)
+{
+	struct cx23885_dev *dev = i2c_get_adapdata(client->adapter);
+
+	dprintk(1, "i2c detach [client=%s]\n", client->name);
+
+	return 0;
+}
+
+void cx23885_call_i2c_clients(struct cx23885_i2c *bus, unsigned int cmd, void *arg)
+{
+//	struct cx23885_dev *dev = bus->dev;
+
+	if (bus->i2c_rc != 0)
+		return;
+
+		i2c_clients_command(&bus->i2c_adap, cmd, arg);
+}
+
+static int cx23885_algo_control(struct i2c_adapter *adap,
+				unsigned int cmd, unsigned long arg)
+{
+	return 0;
+}
+
+static u32 cx23885_functionality(struct i2c_adapter *adap)
+{
+	return I2C_FUNC_SMBUS_EMUL;
+}
+
+static struct i2c_algorithm cx23885_i2c_algo_template = {
+	.master_xfer	= i2c_xfer,
+	.algo_control	= cx23885_algo_control,
+	.functionality	= cx23885_functionality,
+};
+
+/* ----------------------------------------------------------------------- */
+
+static struct i2c_adapter cx23885_i2c_adap_template = {
+	.name              = "cx23885",
+	.owner             = THIS_MODULE,
+	.id                = I2C_HW_B_CX23885,
+	.algo              = &cx23885_i2c_algo_template,
+//	.class             = I2C_CLASS_TV_ANALOG,
+	.client_register   = attach_inform,
+	.client_unregister = detach_inform,
+};
+
+static struct i2c_client cx23885_i2c_client_template = {
+	.name	= "cx23885 internal",
+};
+
+static char *i2c_devs[128] = {
+	[ 0x32 >> 1 ] = "cx24227",
+	[ 0x88 >> 1 ] = "cx25837",
+	[ 0x84 >> 1 ] = "tda8295",
+	[ 0xa0 >> 1 ] = "eeprom",
+	[ 0xc0 >> 1 ] = "mt2131/tda8275",
+	[ 0xc2 >> 1 ] = "mt2131/tda8275",
+};
+
+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 cx23885_i2c_register(struct cx23885_i2c *bus)
+{
+	struct cx23885_dev *dev = bus->dev;
+
+	dprintk(1, "%s(bus = %d)\n", __FUNCTION__, bus->nr);
+
+	memcpy(&bus->i2c_adap, &cx23885_i2c_adap_template, sizeof(bus->i2c_adap));
+	memcpy(&bus->i2c_algo, &cx23885_i2c_algo_template, sizeof(bus->i2c_algo));
+	memcpy(&bus->i2c_client, &cx23885_i2c_client_template, sizeof(bus->i2c_client));
+
+	bus->i2c_adap.dev.parent = &dev->pci->dev;
+
+	strlcpy(bus->i2c_adap.name, bus->dev->name, sizeof(bus->i2c_adap.name));
+	bus->i2c_algo.data = bus;
+	bus->i2c_adap.algo_data = bus;
+	i2c_add_adapter(&bus->i2c_adap);
+
+	bus->i2c_client.adapter = &bus->i2c_adap;
+
+	if (0 == bus->i2c_rc) {
+		printk("%s: i2c bus %d registered\n", dev->name, bus->nr);
+		if (i2c_scan)
+			do_i2c_scan(dev->name, &bus->i2c_client);
+	} else
+		printk("%s: i2c bus %d register FAILED\n", dev->name, bus->nr);
+
+	return bus->i2c_rc;
+}
+
+int cx23885_i2c_unregister(struct cx23885_i2c *bus)
+{
+	i2c_del_adapter(&bus->i2c_adap);
+	return 0;
+}
+
+/* ----------------------------------------------------------------------- */
+
+EXPORT_SYMBOL(cx23885_call_i2c_clients);
+
+/*
+ * Local variables:
+ * c-basic-offset: 8
+ * End:
+ */