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path: root/drivers/media/video/cx23885/cx23885-i2c.c
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Diffstat (limited to 'drivers/media/video/cx23885/cx23885-i2c.c')
-rw-r--r--drivers/media/video/cx23885/cx23885-i2c.c375
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:
+ */