1 files changed, 391 insertions, 0 deletions

diff --git a/drivers/media/video/bt8xx/bttv-i2c.c b/drivers/media/video/bt8xx/bttv-i2c.c
new file mode 100644
index 00000000000..d49b675045f
--- /dev/null
+++ b/drivers/media/video/bt8xx/bttv-i2c.c
@@ -0,0 +1,391 @@
+/*
+
+    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>
+
+    (c) 2005 Mauro Carvalho Chehab <mchehab@infradead.org>
+        - Multituner support and i2c address binding
+
+    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/init.h>
+#include <linux/delay.h>
+
+#include "bttvp.h"
+#include <media/v4l2-common.h>
+#include <linux/jiffies.h>
+#include <asm/io.h>
+
+static int i2c_debug;
+static int i2c_hw;
+static int i2c_scan;
+module_param(i2c_debug, int, 0644);
+MODULE_PARM_DESC(i2c_debug, "configure i2c debug level");
+module_param(i2c_hw,    int, 0444);
+MODULE_PARM_DESC(i2c_hw,"force use of hardware i2c support, "
+                        "instead of software bitbang");
+module_param(i2c_scan,  int, 0444);
+MODULE_PARM_DESC(i2c_scan,"scan i2c bus at insmod time");
+
+static unsigned int i2c_udelay = 5;
+module_param(i2c_udelay, int, 0444);
+MODULE_PARM_DESC(i2c_udelay,"soft i2c delay at insmod time, in usecs "
+                "(should be 5 or higher). Lower value means higher bus speed.");
+
+/* ----------------------------------------------------------------------- */
+/* 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 __devinitdata bttv_i2c_algo_bit_template = {
+        .setsda  = bttv_bit_setsda,
+        .setscl  = bttv_bit_setscl,
+        .getsda  = bttv_bit_getsda,
+        .getscl  = bttv_bit_getscl,
+        .udelay  = 16,
+        .timeout = 200,
+};
+
+/* ----------------------------------------------------------------------- */
+/* I2C functions - hardware i2c                                            */
+
+static u32 functionality(struct i2c_adapter *adap)
+{
+        return I2C_FUNC_SMBUS_EMUL;
+}
+
+static int
+bttv_i2c_wait_done(struct bttv *btv)
+{
+        int rc = 0;
+
+        /* timeout */
+        if (wait_event_interruptible_timeout(btv->i2c_queue,
+            btv->i2c_done, msecs_to_jiffies(85)) == -ERESTARTSYS)
+                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 v4l2_device *v4l2_dev = i2c_get_adapdata(i2c_adap);
+        struct bttv *btv = to_bttv(v4l2_dev);
+        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 const struct i2c_algorithm bttv_algo = {
+        .master_xfer   = bttv_i2c_xfer,
+        .functionality = functionality,
+};
+
+/* ----------------------------------------------------------------------- */
+/* I2C functions - common stuff                                            */
+
+/* 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)
+{
+        memset(eedata, 0, 256);
+        if (0 != btv->i2c_rc)
+                return;
+        btv->i2c_client.addr = addr >> 1;
+        tveeprom_read(&btv->i2c_client, eedata, 256);
+}
+
+static char *i2c_devs[128] = {
+        [ 0x1c >> 1 ] = "lgdt330x",
+        [ 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 < ARRAY_SIZE(i2c_devs); 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)
+{
+        strlcpy(btv->i2c_client.name, "bttv internal", I2C_NAME_SIZE);
+
+        if (i2c_hw)
+                btv->use_i2c_hw = 1;
+        if (btv->use_i2c_hw) {
+                /* bt878 */
+                strlcpy(btv->c.i2c_adap.name, "bt878",
+                        sizeof(btv->c.i2c_adap.name));
+                btv->c.i2c_adap.algo = &bttv_algo;
+        } else {
+                /* bt848 */
+        /* Prevents usage of invalid delay values */
+                if (i2c_udelay<5)
+                        i2c_udelay=5;
+
+                strlcpy(btv->c.i2c_adap.name, "bttv",
+                        sizeof(btv->c.i2c_adap.name));
+                memcpy(&btv->i2c_algo, &bttv_i2c_algo_bit_template,
+                       sizeof(bttv_i2c_algo_bit_template));
+                btv->i2c_algo.udelay = i2c_udelay;
+                btv->i2c_algo.data = btv;
+                btv->c.i2c_adap.algo_data = &btv->i2c_algo;
+        }
+        btv->c.i2c_adap.owner = THIS_MODULE;
+
+        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->c.v4l2_dev);
+        btv->i2c_client.adapter = &btv->c.i2c_adap;
+
+
+        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.v4l2_dev.name, &btv->i2c_client);
+
+        return btv->i2c_rc;
+}