1 files changed, 170 insertions, 0 deletions

diff --git a/drivers/media/video/saa7164/saa7164-i2c.c b/drivers/media/video/saa7164/saa7164-i2c.c
new file mode 100644
index 000000000000..4c431b4ac8db
--- /dev/null
+++ b/drivers/media/video/saa7164/saa7164-i2c.c
@@ -0,0 +1,170 @@
+/*
+ *  Driver for the NXP SAA7164 PCIe bridge
+ *
+ *  Copyright (c) 2009 Steven Toth <stoth@kernellabs.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 "saa7164.h"
+
+static int i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs, int num)
+{
+        struct saa7164_i2c *bus = i2c_adap->algo_data;
+        struct saa7164_dev *dev = bus->dev;
+        int i, retval = 0;
+
+        dprintk(DBGLVL_I2C, "%s(num = %d)\n", __func__, num);
+
+        for (i = 0 ; i < num; i++) {
+                dprintk(DBGLVL_I2C, "%s(num = %d) addr = 0x%02x  len = 0x%x\n",
+                        __func__, num, msgs[i].addr, msgs[i].len);
+                if (msgs[i].flags & I2C_M_RD) {
+                        /* Unsupported - Yet*/
+                        printk(KERN_ERR "%s() Unsupported - Yet\n", __func__);
+                        continue;
+                } else if (i + 1 < num && (msgs[i + 1].flags & I2C_M_RD) &&
+                           msgs[i].addr == msgs[i + 1].addr) {
+                        /* write then read from same address */
+
+                        retval = saa7164_api_i2c_read(bus, msgs[i].addr,
+                                msgs[i].len, msgs[i].buf,
+                                msgs[i+1].len, msgs[i+1].buf
+                                );
+
+                        i++;
+
+                        if (retval < 0)
+                                goto err;
+                } else {
+                        /* write */
+                        retval = saa7164_api_i2c_write(bus, msgs[i].addr,
+                                msgs[i].len, msgs[i].buf);
+                }
+                if (retval < 0)
+                        goto err;
+        }
+        return num;
+
+ err:
+        return retval;
+}
+
+static int attach_inform(struct i2c_client *client)
+{
+        struct saa7164_i2c *bus = i2c_get_adapdata(client->adapter);
+        struct saa7164_dev *dev = bus->dev;
+
+        dprintk(DBGLVL_I2C, "%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 saa7164_dev *dev = i2c_get_adapdata(client->adapter);
+
+        dprintk(DBGLVL_I2C, "i2c detach [client=%s]\n", client->name);
+
+        return 0;
+}
+
+void saa7164_call_i2c_clients(struct saa7164_i2c *bus, unsigned int cmd,
+        void *arg)
+{
+        if (bus->i2c_rc != 0)
+                return;
+
+        i2c_clients_command(&bus->i2c_adap, cmd, arg);
+}
+
+static u32 saa7164_functionality(struct i2c_adapter *adap)
+{
+        return I2C_FUNC_I2C;
+}
+
+static struct i2c_algorithm saa7164_i2c_algo_template = {
+        .master_xfer    = i2c_xfer,
+        .functionality  = saa7164_functionality,
+};
+
+/* ----------------------------------------------------------------------- */
+
+static struct i2c_adapter saa7164_i2c_adap_template = {
+        .name              = "saa7164",
+        .owner             = THIS_MODULE,
+        .id                = I2C_HW_B_SAA7164,
+        .algo              = &saa7164_i2c_algo_template,
+        .client_register   = attach_inform,
+        .client_unregister = detach_inform,
+};
+
+static struct i2c_client saa7164_i2c_client_template = {
+        .name   = "saa7164 internal",
+};
+
+int saa7164_i2c_register(struct saa7164_i2c *bus)
+{
+        struct saa7164_dev *dev = bus->dev;
+
+        dprintk(DBGLVL_I2C, "%s(bus = %d)\n", __func__, bus->nr);
+
+        memcpy(&bus->i2c_adap, &saa7164_i2c_adap_template,
+               sizeof(bus->i2c_adap));
+
+        memcpy(&bus->i2c_algo, &saa7164_i2c_algo_template,
+               sizeof(bus->i2c_algo));
+
+        memcpy(&bus->i2c_client, &saa7164_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_set_adapdata(&bus->i2c_adap, bus);
+        i2c_add_adapter(&bus->i2c_adap);
+
+        bus->i2c_client.adapter = &bus->i2c_adap;
+
+        if (0 == bus->i2c_rc) {
+                printk(KERN_ERR "%s: i2c bus %d registered\n",
+                        dev->name, bus->nr);
+        } else
+                printk(KERN_ERR "%s: i2c bus %d register FAILED\n",
+                        dev->name, bus->nr);
+
+        return bus->i2c_rc;
+}
+
+int saa7164_i2c_unregister(struct saa7164_i2c *bus)
+{
+        i2c_del_adapter(&bus->i2c_adap);
+        return 0;
+}