1 files changed, 423 insertions, 0 deletions

diff --git a/drivers/media/video/saa7134/saa7134-i2c.c b/drivers/media/video/saa7134/saa7134-i2c.c
new file mode 100644
index 00000000000..2d3f6d265bb
--- /dev/null
+++ b/drivers/media/video/saa7134/saa7134-i2c.c
@@ -0,0 +1,423 @@
+/*
+ *
+ * device driver for philips saa7134 based TV cards
+ * i2c interface support
+ *
+ * (c) 2001,02 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]
+ *
+ *  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/init.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+
+#include "saa7134-reg.h"
+#include "saa7134.h"
+#include <media/v4l2-common.h>
+
+/* ----------------------------------------------------------- */
+
+static unsigned int i2c_debug;
+module_param(i2c_debug, int, 0644);
+MODULE_PARM_DESC(i2c_debug,"enable debug messages [i2c]");
+
+static unsigned int i2c_scan;
+module_param(i2c_scan, int, 0444);
+MODULE_PARM_DESC(i2c_scan,"scan i2c bus at insmod time");
+
+#define d1printk if (1 == i2c_debug) printk
+#define d2printk if (2 == i2c_debug) printk
+
+#define I2C_WAIT_DELAY  32
+#define I2C_WAIT_RETRY  16
+
+/* ----------------------------------------------------------- */
+
+static char *str_i2c_status[] = {
+        "IDLE", "DONE_STOP", "BUSY", "TO_SCL", "TO_ARB", "DONE_WRITE",
+        "DONE_READ", "DONE_WRITE_TO", "DONE_READ_TO", "NO_DEVICE",
+        "NO_ACKN", "BUS_ERR", "ARB_LOST", "SEQ_ERR", "ST_ERR", "SW_ERR"
+};
+
+enum i2c_status {
+        IDLE          = 0,  // no I2C command pending
+        DONE_STOP     = 1,  // I2C command done and STOP executed
+        BUSY          = 2,  // executing I2C command
+        TO_SCL        = 3,  // executing I2C command, time out on clock stretching
+        TO_ARB        = 4,  // time out on arbitration trial, still trying
+        DONE_WRITE    = 5,  // I2C command done and awaiting next write command
+        DONE_READ     = 6,  // I2C command done and awaiting next read command
+        DONE_WRITE_TO = 7,  // see 5, and time out on status echo
+        DONE_READ_TO  = 8,  // see 6, and time out on status echo
+        NO_DEVICE     = 9,  // no acknowledge on device slave address
+        NO_ACKN       = 10, // no acknowledge after data byte transfer
+        BUS_ERR       = 11, // bus error
+        ARB_LOST      = 12, // arbitration lost during transfer
+        SEQ_ERR       = 13, // erroneous programming sequence
+        ST_ERR        = 14, // wrong status echoing
+        SW_ERR        = 15  // software error
+};
+
+static char *str_i2c_attr[] = {
+        "NOP", "STOP", "CONTINUE", "START"
+};
+
+enum i2c_attr {
+        NOP           = 0,  // no operation on I2C bus
+        STOP          = 1,  // stop condition, no associated byte transfer
+        CONTINUE      = 2,  // continue with byte transfer
+        START         = 3   // start condition with byte transfer
+};
+
+static inline enum i2c_status i2c_get_status(struct saa7134_dev *dev)
+{
+        enum i2c_status status;
+
+        status = saa_readb(SAA7134_I2C_ATTR_STATUS) & 0x0f;
+        d2printk(KERN_DEBUG "%s: i2c stat <= %s\n",dev->name,
+                 str_i2c_status[status]);
+        return status;
+}
+
+static inline void i2c_set_status(struct saa7134_dev *dev,
+                                  enum i2c_status status)
+{
+        d2printk(KERN_DEBUG "%s: i2c stat => %s\n",dev->name,
+                 str_i2c_status[status]);
+        saa_andorb(SAA7134_I2C_ATTR_STATUS,0x0f,status);
+}
+
+static inline void i2c_set_attr(struct saa7134_dev *dev, enum i2c_attr attr)
+{
+        d2printk(KERN_DEBUG "%s: i2c attr => %s\n",dev->name,
+                 str_i2c_attr[attr]);
+        saa_andorb(SAA7134_I2C_ATTR_STATUS,0xc0,attr << 6);
+}
+
+static inline int i2c_is_error(enum i2c_status status)
+{
+        switch (status) {
+        case NO_DEVICE:
+        case NO_ACKN:
+        case BUS_ERR:
+        case ARB_LOST:
+        case SEQ_ERR:
+        case ST_ERR:
+                return true;
+        default:
+                return false;
+        }
+}
+
+static inline int i2c_is_idle(enum i2c_status status)
+{
+        switch (status) {
+        case IDLE:
+        case DONE_STOP:
+                return true;
+        default:
+                return false;
+        }
+}
+
+static inline int i2c_is_busy(enum i2c_status status)
+{
+        switch (status) {
+        case BUSY:
+        case TO_SCL:
+        case TO_ARB:
+                return true;
+        default:
+                return false;
+        }
+}
+
+static int i2c_is_busy_wait(struct saa7134_dev *dev)
+{
+        enum i2c_status status;
+        int count;
+
+        for (count = 0; count < I2C_WAIT_RETRY; count++) {
+                status = i2c_get_status(dev);
+                if (!i2c_is_busy(status))
+                        break;
+                saa_wait(I2C_WAIT_DELAY);
+        }
+        if (I2C_WAIT_RETRY == count)
+                return false;
+        return true;
+}
+
+static int i2c_reset(struct saa7134_dev *dev)
+{
+        enum i2c_status status;
+        int count;
+
+        d2printk(KERN_DEBUG "%s: i2c reset\n",dev->name);
+        status = i2c_get_status(dev);
+        if (!i2c_is_error(status))
+                return true;
+        i2c_set_status(dev,status);
+
+        for (count = 0; count < I2C_WAIT_RETRY; count++) {
+                status = i2c_get_status(dev);
+                if (!i2c_is_error(status))
+                        break;
+                udelay(I2C_WAIT_DELAY);
+        }
+        if (I2C_WAIT_RETRY == count)
+                return false;
+
+        if (!i2c_is_idle(status))
+                return false;
+
+        i2c_set_attr(dev,NOP);
+        return true;
+}
+
+static inline int i2c_send_byte(struct saa7134_dev *dev,
+                                enum i2c_attr attr,
+                                unsigned char data)
+{
+        enum i2c_status status;
+        __u32 dword;
+
+        /* have to write both attr + data in one 32bit word */
+        dword  = saa_readl(SAA7134_I2C_ATTR_STATUS >> 2);
+        dword &= 0x0f;
+        dword |= (attr << 6);
+        dword |= ((__u32)data << 8);
+        dword |= 0x00 << 16;  /* 100 kHz */
+//      dword |= 0x40 << 16;  /* 400 kHz */
+        dword |= 0xf0 << 24;
+        saa_writel(SAA7134_I2C_ATTR_STATUS >> 2, dword);
+        d2printk(KERN_DEBUG "%s: i2c data => 0x%x\n",dev->name,data);
+
+        if (!i2c_is_busy_wait(dev))
+                return -EIO;
+        status = i2c_get_status(dev);
+        if (i2c_is_error(status))
+                return -EIO;
+        return 0;
+}
+
+static inline int i2c_recv_byte(struct saa7134_dev *dev)
+{
+        enum i2c_status status;
+        unsigned char data;
+
+        i2c_set_attr(dev,CONTINUE);
+        if (!i2c_is_busy_wait(dev))
+                return -EIO;
+        status = i2c_get_status(dev);
+        if (i2c_is_error(status))
+                return -EIO;
+        data = saa_readb(SAA7134_I2C_DATA);
+        d2printk(KERN_DEBUG "%s: i2c data <= 0x%x\n",dev->name,data);
+        return data;
+}
+
+static int saa7134_i2c_xfer(struct i2c_adapter *i2c_adap,
+                            struct i2c_msg *msgs, int num)
+{
+        struct saa7134_dev *dev = i2c_adap->algo_data;
+        enum i2c_status status;
+        unsigned char data;
+        int addr,rc,i,byte;
+
+        status = i2c_get_status(dev);
+        if (!i2c_is_idle(status))
+                if (!i2c_reset(dev))
+                        return -EIO;
+
+        d2printk("start xfer\n");
+        d1printk(KERN_DEBUG "%s: i2c xfer:",dev->name);
+        for (i = 0; i < num; i++) {
+                if (!(msgs[i].flags & I2C_M_NOSTART) || 0 == i) {
+                        /* send address */
+                        d2printk("send address\n");
+                        addr  = msgs[i].addr << 1;
+                        if (msgs[i].flags & I2C_M_RD)
+                                addr |= 1;
+                        if (i > 0 && msgs[i].flags & I2C_M_RD && msgs[i].addr != 0x40) {
+                                /* workaround for a saa7134 i2c bug
+                                 * needed to talk to the mt352 demux
+                                 * thanks to pinnacle for the hint */
+                                int quirk = 0xfe;
+                                d1printk(" [%02x quirk]",quirk);
+                                i2c_send_byte(dev,START,quirk);
+                                i2c_recv_byte(dev);
+                        }
+                        d1printk(" < %02x", addr);
+                        rc = i2c_send_byte(dev,START,addr);
+                        if (rc < 0)
+                                 goto err;
+                }
+                if (msgs[i].flags & I2C_M_RD) {
+                        /* read bytes */
+                        d2printk("read bytes\n");
+                        for (byte = 0; byte < msgs[i].len; byte++) {
+                                d1printk(" =");
+                                rc = i2c_recv_byte(dev);
+                                if (rc < 0)
+                                        goto err;
+                                d1printk("%02x", rc);
+                                msgs[i].buf[byte] = rc;
+                        }
+                } else {
+                        /* write bytes */
+                        d2printk("write bytes\n");
+                        for (byte = 0; byte < msgs[i].len; byte++) {
+                                data = msgs[i].buf[byte];
+                                d1printk(" %02x", data);
+                                rc = i2c_send_byte(dev,CONTINUE,data);
+                                if (rc < 0)
+                                        goto err;
+                        }
+                }
+        }
+        d2printk("xfer done\n");
+        d1printk(" >");
+        i2c_set_attr(dev,STOP);
+        rc = -EIO;
+        if (!i2c_is_busy_wait(dev))
+                goto err;
+        status = i2c_get_status(dev);
+        if (i2c_is_error(status))
+                goto err;
+        /* ensure that the bus is idle for at least one bit slot */
+        msleep(1);
+
+        d1printk("\n");
+        return num;
+ err:
+        if (1 == i2c_debug) {
+                status = i2c_get_status(dev);
+                printk(" ERROR: %s\n",str_i2c_status[status]);
+        }
+        return rc;
+}
+
+/* ----------------------------------------------------------- */
+
+static u32 functionality(struct i2c_adapter *adap)
+{
+        return I2C_FUNC_SMBUS_EMUL;
+}
+
+static struct i2c_algorithm saa7134_algo = {
+        .master_xfer   = saa7134_i2c_xfer,
+        .functionality = functionality,
+};
+
+static struct i2c_adapter saa7134_adap_template = {
+        .owner         = THIS_MODULE,
+        .name          = "saa7134",
+        .algo          = &saa7134_algo,
+};
+
+static struct i2c_client saa7134_client_template = {
+        .name   = "saa7134 internal",
+};
+
+/* ----------------------------------------------------------- */
+
+static int
+saa7134_i2c_eeprom(struct saa7134_dev *dev, unsigned char *eedata, int len)
+{
+        unsigned char buf;
+        int i,err;
+
+        dev->i2c_client.addr = 0xa0 >> 1;
+        buf = 0;
+        if (1 != (err = i2c_master_send(&dev->i2c_client,&buf,1))) {
+                printk(KERN_INFO "%s: Huh, no eeprom present (err=%d)?\n",
+                       dev->name,err);
+                return -1;
+        }
+        if (len != (err = i2c_master_recv(&dev->i2c_client,eedata,len))) {
+                printk(KERN_WARNING "%s: i2c eeprom read error (err=%d)\n",
+                       dev->name,err);
+                return -1;
+        }
+        for (i = 0; i < len; i++) {
+                if (0 == (i % 16))
+                        printk(KERN_INFO "%s: i2c eeprom %02x:",dev->name,i);
+                printk(" %02x",eedata[i]);
+                if (15 == (i % 16))
+                        printk("\n");
+        }
+        return 0;
+}
+
+static char *i2c_devs[128] = {
+        [ 0x20      ] = "mpeg encoder (saa6752hs)",
+        [ 0xa0 >> 1 ] = "eeprom",
+        [ 0xc0 >> 1 ] = "tuner (analog)",
+        [ 0x86 >> 1 ] = "tda9887",
+        [ 0x5a >> 1 ] = "remote control",
+};
+
+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] : "???");
+        }
+}
+
+int saa7134_i2c_register(struct saa7134_dev *dev)
+{
+        dev->i2c_adap = saa7134_adap_template;
+        dev->i2c_adap.dev.parent = &dev->pci->dev;
+        strcpy(dev->i2c_adap.name,dev->name);
+        dev->i2c_adap.algo_data = dev;
+        i2c_set_adapdata(&dev->i2c_adap, &dev->v4l2_dev);
+        i2c_add_adapter(&dev->i2c_adap);
+
+        dev->i2c_client = saa7134_client_template;
+        dev->i2c_client.adapter = &dev->i2c_adap;
+
+        saa7134_i2c_eeprom(dev,dev->eedata,sizeof(dev->eedata));
+        if (i2c_scan)
+                do_i2c_scan(dev->name,&dev->i2c_client);
+
+        /* Instantiate the IR receiver device, if present */
+        saa7134_probe_i2c_ir(dev);
+        return 0;
+}
+
+int saa7134_i2c_unregister(struct saa7134_dev *dev)
+{
+        i2c_del_adapter(&dev->i2c_adap);
+        return 0;
+}
+
+/* ----------------------------------------------------------- */
+/*
+ * Local variables:
+ * c-basic-offset: 8
+ * End:
+ */