1 files changed, 385 insertions, 0 deletions

diff --git a/drivers/media/video/au0828/au0828-i2c.c b/drivers/media/video/au0828/au0828-i2c.c
new file mode 100644
index 000000000000..94c8b74a6651
--- /dev/null
+++ b/drivers/media/video/au0828/au0828-i2c.c
@@ -0,0 +1,385 @@
+/*
+ *  Driver for the Auvitek AU0828 USB bridge
+ *
+ *  Copyright (c) 2008 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 <linux/io.h>
+
+#include "au0828.h"
+
+#include <media/v4l2-common.h>
+
+unsigned int i2c_debug;
+module_param(i2c_debug, int, 0444);
+MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]");
+
+unsigned int i2c_scan;
+module_param(i2c_scan, int, 0444);
+MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time");
+
+#define I2C_WAIT_DELAY 512
+#define I2C_WAIT_RETRY 64
+
+static inline int i2c_slave_did_write_ack(struct i2c_adapter *i2c_adap)
+{
+        struct au0828_dev *dev = i2c_adap->algo_data;
+        return au0828_read(dev, REG_201) & 0x08 ? 0 : 1;
+}
+
+static inline int i2c_slave_did_read_ack(struct i2c_adapter *i2c_adap)
+{
+        struct au0828_dev *dev = i2c_adap->algo_data;
+        return au0828_read(dev, REG_201) & 0x02 ? 0 : 1;
+}
+
+static int i2c_wait_read_ack(struct i2c_adapter *i2c_adap)
+{
+        int count;
+
+        for (count = 0; count < I2C_WAIT_RETRY; count++) {
+                if (!i2c_slave_did_read_ack(i2c_adap))
+                        break;
+                udelay(I2C_WAIT_DELAY);
+        }
+
+        if (I2C_WAIT_RETRY == count)
+                return 0;
+
+        return 1;
+}
+
+static inline int i2c_is_read_busy(struct i2c_adapter *i2c_adap)
+{
+        struct au0828_dev *dev = i2c_adap->algo_data;
+        return au0828_read(dev, REG_201) & 0x01 ? 0 : 1;
+}
+
+static int i2c_wait_read_done(struct i2c_adapter *i2c_adap)
+{
+        int count;
+
+        for (count = 0; count < I2C_WAIT_RETRY; count++) {
+                if (!i2c_is_read_busy(i2c_adap))
+                        break;
+                udelay(I2C_WAIT_DELAY);
+        }
+
+        if (I2C_WAIT_RETRY == count)
+                return 0;
+
+        return 1;
+}
+
+static inline int i2c_is_write_done(struct i2c_adapter *i2c_adap)
+{
+        struct au0828_dev *dev = i2c_adap->algo_data;
+        return au0828_read(dev, REG_201) & 0x04 ? 1 : 0;
+}
+
+static int i2c_wait_write_done(struct i2c_adapter *i2c_adap)
+{
+        int count;
+
+        for (count = 0; count < I2C_WAIT_RETRY; count++) {
+                if (i2c_is_write_done(i2c_adap))
+                        break;
+                udelay(I2C_WAIT_DELAY);
+        }
+
+        if (I2C_WAIT_RETRY == count)
+                return 0;
+
+        return 1;
+}
+
+static inline int i2c_is_busy(struct i2c_adapter *i2c_adap)
+{
+        struct au0828_dev *dev = i2c_adap->algo_data;
+        return au0828_read(dev, REG_201) & 0x10 ? 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;
+}
+
+/* FIXME: Implement join handling correctly */
+static int i2c_sendbytes(struct i2c_adapter *i2c_adap,
+        const struct i2c_msg *msg, int joined_rlen)
+{
+        int i, strobe = 0;
+        struct au0828_dev *dev = i2c_adap->algo_data;
+
+        dprintk(4, "%s()\n", __func__);
+
+        au0828_write(dev, REG_2FF, 0x01);
+        au0828_write(dev, REG_202, 0x07);
+
+        /* Hardware needs 8 bit addresses */
+        au0828_write(dev, REG_203, msg->addr << 1);
+
+        dprintk(4, "SEND: %02x\n", msg->addr);
+
+        for (i = 0; i < msg->len;) {
+
+                dprintk(4, " %02x\n", msg->buf[i]);
+
+                au0828_write(dev, REG_205, msg->buf[i]);
+
+                strobe++;
+                i++;
+
+                if ((strobe >= 4) || (i >= msg->len)) {
+
+                        /* Strobe the byte into the bus */
+                        if (i < msg->len)
+                                au0828_write(dev, REG_200, 0x41);
+                        else
+                                au0828_write(dev, REG_200, 0x01);
+
+                        /* Reset strobe trigger */
+                        strobe = 0;
+
+                        if (!i2c_wait_write_done(i2c_adap))
+                                return -EIO;
+
+                }
+
+        }
+        if (!i2c_wait_done(i2c_adap))
+                return -EIO;
+
+        dprintk(4, "\n");
+
+        return msg->len;
+}
+
+/* FIXME: Implement join handling correctly */
+static int i2c_readbytes(struct i2c_adapter *i2c_adap,
+        const struct i2c_msg *msg, int joined)
+{
+        struct au0828_dev *dev = i2c_adap->algo_data;
+        int i;
+
+        dprintk(4, "%s()\n", __func__);
+
+        au0828_write(dev, REG_2FF, 0x01);
+        au0828_write(dev, REG_202, 0x07);
+
+        /* Hardware needs 8 bit addresses */
+        au0828_write(dev, REG_203, msg->addr << 1);
+
+        dprintk(4, " RECV:\n");
+
+        /* Deal with i2c_scan */
+        if (msg->len == 0) {
+                au0828_write(dev, REG_200, 0x20);
+                if (i2c_wait_read_ack(i2c_adap))
+                        return -EIO;
+                return 0;
+        }
+
+        for (i = 0; i < msg->len;) {
+
+                i++;
+
+                if (i < msg->len)
+                        au0828_write(dev, REG_200, 0x60);
+                else
+                        au0828_write(dev, REG_200, 0x20);
+
+                if (!i2c_wait_read_done(i2c_adap))
+                        return -EIO;
+
+                msg->buf[i-1] = au0828_read(dev, REG_209) & 0xff;
+
+                dprintk(4, " %02x\n", msg->buf[i-1]);
+        }
+        if (!i2c_wait_done(i2c_adap))
+                return -EIO;
+
+        dprintk(4, "\n");
+
+        return msg->len;
+}
+
+static int i2c_xfer(struct i2c_adapter *i2c_adap,
+                    struct i2c_msg *msgs, int num)
+{
+        int i, retval = 0;
+
+        dprintk(4, "%s(num = %d)\n", __func__, num);
+
+        for (i = 0; i < num; i++) {
+                dprintk(4, "%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) {
+                        /* read */
+                        retval = i2c_readbytes(i2c_adap, &msgs[i], 0);
+                } 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 = i2c_sendbytes(i2c_adap, &msgs[i],
+                                               msgs[i + 1].len);
+                        if (retval < 0)
+                                goto err;
+                        i++;
+                        retval = i2c_readbytes(i2c_adap, &msgs[i], 1);
+                } else {
+                        /* write */
+                        retval = i2c_sendbytes(i2c_adap, &msgs[i], 0);
+                }
+                if (retval < 0)
+                        goto err;
+        }
+        return num;
+
+err:
+        return retval;
+}
+
+static int attach_inform(struct i2c_client *client)
+{
+        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)
+{
+        dprintk(1, "i2c detach [client=%s]\n", client->name);
+
+        return 0;
+}
+
+void au0828_call_i2c_clients(struct au0828_dev *dev,
+                              unsigned int cmd, void *arg)
+{
+        if (dev->i2c_rc != 0)
+                return;
+
+        i2c_clients_command(&dev->i2c_adap, cmd, arg);
+}
+
+static u32 au0828_functionality(struct i2c_adapter *adap)
+{
+        return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_I2C;
+}
+
+static struct i2c_algorithm au0828_i2c_algo_template = {
+        .master_xfer    = i2c_xfer,
+        .functionality  = au0828_functionality,
+};
+
+/* ----------------------------------------------------------------------- */
+
+static struct i2c_adapter au0828_i2c_adap_template = {
+        .name              = DRIVER_NAME,
+        .owner             = THIS_MODULE,
+        .id                = I2C_HW_B_AU0828,
+        .algo              = &au0828_i2c_algo_template,
+        .class             = I2C_CLASS_TV_ANALOG,
+        .client_register   = attach_inform,
+        .client_unregister = detach_inform,
+};
+
+static struct i2c_client au0828_i2c_client_template = {
+        .name   = "au0828 internal",
+};
+
+static char *i2c_devs[128] = {
+        [0x8e >> 1] = "au8522",
+        [0xa0 >> 1] = "eeprom",
+        [0xc2 >> 1] = "tuner/xc5000",
+};
+
+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(KERN_INFO "%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 au0828_i2c_register(struct au0828_dev *dev)
+{
+        dprintk(1, "%s()\n", __func__);
+
+        memcpy(&dev->i2c_adap, &au0828_i2c_adap_template,
+               sizeof(dev->i2c_adap));
+        memcpy(&dev->i2c_algo, &au0828_i2c_algo_template,
+               sizeof(dev->i2c_algo));
+        memcpy(&dev->i2c_client, &au0828_i2c_client_template,
+               sizeof(dev->i2c_client));
+
+        dev->i2c_adap.dev.parent = &dev->usbdev->dev;
+
+        strlcpy(dev->i2c_adap.name, DRIVER_NAME,
+                sizeof(dev->i2c_adap.name));
+
+        dev->i2c_algo.data = dev;
+        dev->i2c_adap.algo_data = dev;
+        i2c_set_adapdata(&dev->i2c_adap, dev);
+        i2c_add_adapter(&dev->i2c_adap);
+
+        dev->i2c_client.adapter = &dev->i2c_adap;
+
+        if (0 == dev->i2c_rc) {
+                printk(KERN_INFO "%s: i2c bus registered\n", DRIVER_NAME);
+                if (i2c_scan)
+                        do_i2c_scan(DRIVER_NAME, &dev->i2c_client);
+        } else
+                printk(KERN_INFO "%s: i2c bus register FAILED\n", DRIVER_NAME);
+
+        return dev->i2c_rc;
+}
+
+int au0828_i2c_unregister(struct au0828_dev *dev)
+{
+        i2c_del_adapter(&dev->i2c_adap);
+        return 0;
+}
+