1 files changed, 532 insertions, 0 deletions

diff --git a/drivers/media/usb/cx231xx/cx231xx-i2c.c b/drivers/media/usb/cx231xx/cx231xx-i2c.c
new file mode 100644
index 000000000000..781feed406f7
--- /dev/null
+++ b/drivers/media/usb/cx231xx/cx231xx-i2c.c
@@ -0,0 +1,532 @@
+/*
+   cx231xx-i2c.c - driver for Conexant Cx23100/101/102 USB video capture devices
+
+   Copyright (C) 2008 <srinivasa.deevi at conexant dot com>
+                Based on em28xx driver
+                Based on Cx23885 driver
+
+   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/kernel.h>
+#include <linux/usb.h>
+#include <linux/i2c.h>
+#include <media/v4l2-common.h>
+#include <media/tuner.h>
+
+#include "cx231xx.h"
+
+/* ----------------------------------------------------------- */
+
+static unsigned int i2c_scan;
+module_param(i2c_scan, int, 0444);
+MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time");
+
+static unsigned int i2c_debug;
+module_param(i2c_debug, int, 0644);
+MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]");
+
+#define dprintk1(lvl, fmt, args...)                     \
+do {                                                    \
+        if (i2c_debug >= lvl) {                         \
+                printk(fmt, ##args);                    \
+                }                                       \
+} while (0)
+
+#define dprintk2(lvl, fmt, args...)                     \
+do {                                                    \
+        if (i2c_debug >= lvl) {                         \
+                printk(KERN_DEBUG "%s at %s: " fmt,     \
+                       dev->name, __func__ , ##args);   \
+      }                                                 \
+} while (0)
+
+static inline bool is_tuner(struct cx231xx *dev, struct cx231xx_i2c *bus,
+                        const struct i2c_msg *msg, int tuner_type)
+{
+        if (bus->nr != dev->board.tuner_i2c_master)
+                return false;
+
+        if (msg->addr != dev->board.tuner_addr)
+                return false;
+
+        if (dev->tuner_type != tuner_type)
+                return false;
+
+        return true;
+}
+
+/*
+ * cx231xx_i2c_send_bytes()
+ */
+int cx231xx_i2c_send_bytes(struct i2c_adapter *i2c_adap,
+                           const struct i2c_msg *msg)
+{
+        struct cx231xx_i2c *bus = i2c_adap->algo_data;
+        struct cx231xx *dev = bus->dev;
+        struct cx231xx_i2c_xfer_data req_data;
+        int status = 0;
+        u16 size = 0;
+        u8 loop = 0;
+        u8 saddr_len = 1;
+        u8 *buf_ptr = NULL;
+        u16 saddr = 0;
+        u8 need_gpio = 0;
+
+        if (is_tuner(dev, bus, msg, TUNER_XC5000)) {
+                size = msg->len;
+
+                if (size == 2) {        /* register write sub addr */
+                        /* Just writing sub address will cause problem
+                        * to XC5000. So ignore the request */
+                        return 0;
+                } else if (size == 4) { /* register write with sub addr */
+                        if (msg->len >= 2)
+                                saddr = msg->buf[0] << 8 | msg->buf[1];
+                        else if (msg->len == 1)
+                                saddr = msg->buf[0];
+
+                        switch (saddr) {
+                        case 0x0000:    /* start tuner calibration mode */
+                                need_gpio = 1;
+                                /* FW Loading is done */
+                                dev->xc_fw_load_done = 1;
+                                break;
+                        case 0x000D:    /* Set signal source */
+                        case 0x0001:    /* Set TV standard - Video */
+                        case 0x0002:    /* Set TV standard - Audio */
+                        case 0x0003:    /* Set RF Frequency */
+                                need_gpio = 1;
+                                break;
+                        default:
+                                if (dev->xc_fw_load_done)
+                                        need_gpio = 1;
+                                break;
+                        }
+
+                        if (need_gpio) {
+                                dprintk1(1,
+                                "GPIO WRITE: addr 0x%x, len %d, saddr 0x%x\n",
+                                msg->addr, msg->len, saddr);
+
+                                return dev->cx231xx_gpio_i2c_write(dev,
+                                                                   msg->addr,
+                                                                   msg->buf,
+                                                                   msg->len);
+                        }
+                }
+
+                /* special case for Xc5000 tuner case */
+                saddr_len = 1;
+
+                /* adjust the length to correct length */
+                size -= saddr_len;
+                buf_ptr = (u8 *) (msg->buf + 1);
+
+                do {
+                        /* prepare xfer_data struct */
+                        req_data.dev_addr = msg->addr;
+                        req_data.direction = msg->flags;
+                        req_data.saddr_len = saddr_len;
+                        req_data.saddr_dat = msg->buf[0];
+                        req_data.buf_size = size > 16 ? 16 : size;
+                        req_data.p_buffer = (u8 *) (buf_ptr + loop * 16);
+
+                        bus->i2c_nostop = (size > 16) ? 1 : 0;
+                        bus->i2c_reserve = (loop == 0) ? 0 : 1;
+
+                        /* usb send command */
+                        status = dev->cx231xx_send_usb_command(bus, &req_data);
+                        loop++;
+
+                        if (size >= 16)
+                                size -= 16;
+                        else
+                                size = 0;
+
+                } while (size > 0);
+
+                bus->i2c_nostop = 0;
+                bus->i2c_reserve = 0;
+
+        } else {                /* regular case */
+
+                /* prepare xfer_data struct */
+                req_data.dev_addr = msg->addr;
+                req_data.direction = msg->flags;
+                req_data.saddr_len = 0;
+                req_data.saddr_dat = 0;
+                req_data.buf_size = msg->len;
+                req_data.p_buffer = msg->buf;
+
+                /* usb send command */
+                status = dev->cx231xx_send_usb_command(bus, &req_data);
+        }
+
+        return status < 0 ? status : 0;
+}
+
+/*
+ * cx231xx_i2c_recv_bytes()
+ * read a byte from the i2c device
+ */
+static int cx231xx_i2c_recv_bytes(struct i2c_adapter *i2c_adap,
+                                  const struct i2c_msg *msg)
+{
+        struct cx231xx_i2c *bus = i2c_adap->algo_data;
+        struct cx231xx *dev = bus->dev;
+        struct cx231xx_i2c_xfer_data req_data;
+        int status = 0;
+        u16 saddr = 0;
+        u8 need_gpio = 0;
+
+        if (is_tuner(dev, bus, msg, TUNER_XC5000)) {
+                if (msg->len == 2)
+                        saddr = msg->buf[0] << 8 | msg->buf[1];
+                else if (msg->len == 1)
+                        saddr = msg->buf[0];
+
+                if (dev->xc_fw_load_done) {
+
+                        switch (saddr) {
+                        case 0x0009:    /* BUSY check */
+                                dprintk1(1,
+                                "GPIO R E A D: Special case BUSY check \n");
+                                /*Try read BUSY register, just set it to zero*/
+                                msg->buf[0] = 0;
+                                if (msg->len == 2)
+                                        msg->buf[1] = 0;
+                                return 0;
+                        case 0x0004:    /* read Lock status */
+                                need_gpio = 1;
+                                break;
+
+                        }
+
+                        if (need_gpio) {
+                                /* this is a special case to handle Xceive tuner
+                                clock stretch issue with gpio based I2C */
+
+                                dprintk1(1,
+                                "GPIO R E A D: addr 0x%x, len %d, saddr 0x%x\n",
+                                msg->addr, msg->len,
+                                msg->buf[0] << 8 | msg->buf[1]);
+
+                                status =
+                                    dev->cx231xx_gpio_i2c_write(dev, msg->addr,
+                                                                msg->buf,
+                                                                msg->len);
+                                status =
+                                    dev->cx231xx_gpio_i2c_read(dev, msg->addr,
+                                                               msg->buf,
+                                                               msg->len);
+                                return status;
+                        }
+                }
+
+                /* prepare xfer_data struct */
+                req_data.dev_addr = msg->addr;
+                req_data.direction = msg->flags;
+                req_data.saddr_len = msg->len;
+                req_data.saddr_dat = msg->buf[0] << 8 | msg->buf[1];
+                req_data.buf_size = msg->len;
+                req_data.p_buffer = msg->buf;
+
+                /* usb send command */
+                status = dev->cx231xx_send_usb_command(bus, &req_data);
+
+        } else {
+
+                /* prepare xfer_data struct */
+                req_data.dev_addr = msg->addr;
+                req_data.direction = msg->flags;
+                req_data.saddr_len = 0;
+                req_data.saddr_dat = 0;
+                req_data.buf_size = msg->len;
+                req_data.p_buffer = msg->buf;
+
+                /* usb send command */
+                status = dev->cx231xx_send_usb_command(bus, &req_data);
+        }
+
+        return status < 0 ? status : 0;
+}
+
+/*
+ * cx231xx_i2c_recv_bytes_with_saddr()
+ * read a byte from the i2c device
+ */
+static int cx231xx_i2c_recv_bytes_with_saddr(struct i2c_adapter *i2c_adap,
+                                             const struct i2c_msg *msg1,
+                                             const struct i2c_msg *msg2)
+{
+        struct cx231xx_i2c *bus = i2c_adap->algo_data;
+        struct cx231xx *dev = bus->dev;
+        struct cx231xx_i2c_xfer_data req_data;
+        int status = 0;
+        u16 saddr = 0;
+        u8 need_gpio = 0;
+
+        if (msg1->len == 2)
+                saddr = msg1->buf[0] << 8 | msg1->buf[1];
+        else if (msg1->len == 1)
+                saddr = msg1->buf[0];
+
+        if (is_tuner(dev, bus, msg2, TUNER_XC5000)) {
+                if ((msg2->len < 16)) {
+
+                        dprintk1(1,
+                        "i2c_read: addr 0x%x, len %d, saddr 0x%x, len %d\n",
+                        msg2->addr, msg2->len, saddr, msg1->len);
+
+                        switch (saddr) {
+                        case 0x0008:    /* read FW load status */
+                                need_gpio = 1;
+                                break;
+                        case 0x0004:    /* read Lock status */
+                                need_gpio = 1;
+                                break;
+                        }
+
+                        if (need_gpio) {
+                                status =
+                                    dev->cx231xx_gpio_i2c_write(dev, msg1->addr,
+                                                                msg1->buf,
+                                                                msg1->len);
+                                status =
+                                    dev->cx231xx_gpio_i2c_read(dev, msg2->addr,
+                                                               msg2->buf,
+                                                               msg2->len);
+                                return status;
+                        }
+                }
+        }
+
+        /* prepare xfer_data struct */
+        req_data.dev_addr = msg2->addr;
+        req_data.direction = msg2->flags;
+        req_data.saddr_len = msg1->len;
+        req_data.saddr_dat = saddr;
+        req_data.buf_size = msg2->len;
+        req_data.p_buffer = msg2->buf;
+
+        /* usb send command */
+        status = dev->cx231xx_send_usb_command(bus, &req_data);
+
+        return status < 0 ? status : 0;
+}
+
+/*
+ * cx231xx_i2c_check_for_device()
+ * check if there is a i2c_device at the supplied address
+ */
+static int cx231xx_i2c_check_for_device(struct i2c_adapter *i2c_adap,
+                                        const struct i2c_msg *msg)
+{
+        struct cx231xx_i2c *bus = i2c_adap->algo_data;
+        struct cx231xx *dev = bus->dev;
+        struct cx231xx_i2c_xfer_data req_data;
+        int status = 0;
+
+        /* prepare xfer_data struct */
+        req_data.dev_addr = msg->addr;
+        req_data.direction = msg->flags;
+        req_data.saddr_len = 0;
+        req_data.saddr_dat = 0;
+        req_data.buf_size = 0;
+        req_data.p_buffer = NULL;
+
+        /* usb send command */
+        status = dev->cx231xx_send_usb_command(bus, &req_data);
+
+        return status < 0 ? status : 0;
+}
+
+/*
+ * cx231xx_i2c_xfer()
+ * the main i2c transfer function
+ */
+static int cx231xx_i2c_xfer(struct i2c_adapter *i2c_adap,
+                            struct i2c_msg msgs[], int num)
+{
+        struct cx231xx_i2c *bus = i2c_adap->algo_data;
+        struct cx231xx *dev = bus->dev;
+        int addr, rc, i, byte;
+
+        if (num <= 0)
+                return 0;
+        mutex_lock(&dev->i2c_lock);
+        for (i = 0; i < num; i++) {
+
+                addr = msgs[i].addr >> 1;
+
+                dprintk2(2, "%s %s addr=%x len=%d:",
+                         (msgs[i].flags & I2C_M_RD) ? "read" : "write",
+                         i == num - 1 ? "stop" : "nonstop", addr, msgs[i].len);
+                if (!msgs[i].len) {
+                        /* no len: check only for device presence */
+                        rc = cx231xx_i2c_check_for_device(i2c_adap, &msgs[i]);
+                        if (rc < 0) {
+                                dprintk2(2, " no device\n");
+                                mutex_unlock(&dev->i2c_lock);
+                                return rc;
+                        }
+
+                } else if (msgs[i].flags & I2C_M_RD) {
+                        /* read bytes */
+                        rc = cx231xx_i2c_recv_bytes(i2c_adap, &msgs[i]);
+                        if (i2c_debug >= 2) {
+                                for (byte = 0; byte < msgs[i].len; byte++)
+                                        printk(" %02x", msgs[i].buf[byte]);
+                        }
+                } else if (i + 1 < num && (msgs[i + 1].flags & I2C_M_RD) &&
+                           msgs[i].addr == msgs[i + 1].addr
+                           && (msgs[i].len <= 2) && (bus->nr < 3)) {
+                        /* read bytes */
+                        rc = cx231xx_i2c_recv_bytes_with_saddr(i2c_adap,
+                                                               &msgs[i],
+                                                               &msgs[i + 1]);
+                        if (i2c_debug >= 2) {
+                                for (byte = 0; byte < msgs[i].len; byte++)
+                                        printk(" %02x", msgs[i].buf[byte]);
+                        }
+                        i++;
+                } else {
+                        /* write bytes */
+                        if (i2c_debug >= 2) {
+                                for (byte = 0; byte < msgs[i].len; byte++)
+                                        printk(" %02x", msgs[i].buf[byte]);
+                        }
+                        rc = cx231xx_i2c_send_bytes(i2c_adap, &msgs[i]);
+                }
+                if (rc < 0)
+                        goto err;
+                if (i2c_debug >= 2)
+                        printk("\n");
+        }
+        mutex_unlock(&dev->i2c_lock);
+        return num;
+err:
+        dprintk2(2, " ERROR: %i\n", rc);
+        mutex_unlock(&dev->i2c_lock);
+        return rc;
+}
+
+/* ----------------------------------------------------------- */
+
+/*
+ * functionality()
+ */
+static u32 functionality(struct i2c_adapter *adap)
+{
+        return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_I2C;
+}
+
+static struct i2c_algorithm cx231xx_algo = {
+        .master_xfer = cx231xx_i2c_xfer,
+        .functionality = functionality,
+};
+
+static struct i2c_adapter cx231xx_adap_template = {
+        .owner = THIS_MODULE,
+        .name = "cx231xx",
+        .algo = &cx231xx_algo,
+};
+
+static struct i2c_client cx231xx_client_template = {
+        .name = "cx231xx internal",
+};
+
+/* ----------------------------------------------------------- */
+
+/*
+ * i2c_devs
+ * incomplete list of known devices
+ */
+static char *i2c_devs[128] = {
+        [0x60 >> 1] = "colibri",
+        [0x88 >> 1] = "hammerhead",
+        [0x8e >> 1] = "CIR",
+        [0x32 >> 1] = "GeminiIII",
+        [0x02 >> 1] = "Aquarius",
+        [0xa0 >> 1] = "eeprom",
+        [0xc0 >> 1] = "tuner",
+        [0xc2 >> 1] = "tuner",
+};
+
+/*
+ * cx231xx_do_i2c_scan()
+ * check i2c address range for devices
+ */
+void cx231xx_do_i2c_scan(struct cx231xx *dev, struct i2c_client *c)
+{
+        unsigned char buf;
+        int i, rc;
+
+        cx231xx_info(": Checking for I2C devices ..\n");
+        for (i = 0; i < 128; i++) {
+                c->addr = i;
+                rc = i2c_master_recv(c, &buf, 0);
+                if (rc < 0)
+                        continue;
+                cx231xx_info("%s: i2c scan: found device @ 0x%x  [%s]\n",
+                             dev->name, i << 1,
+                             i2c_devs[i] ? i2c_devs[i] : "???");
+        }
+        cx231xx_info(": Completed Checking for I2C devices.\n");
+}
+
+/*
+ * cx231xx_i2c_register()
+ * register i2c bus
+ */
+int cx231xx_i2c_register(struct cx231xx_i2c *bus)
+{
+        struct cx231xx *dev = bus->dev;
+
+        BUG_ON(!dev->cx231xx_send_usb_command);
+
+        bus->i2c_adap = cx231xx_adap_template;
+        bus->i2c_client = cx231xx_client_template;
+        bus->i2c_adap.dev.parent = &dev->udev->dev;
+
+        strlcpy(bus->i2c_adap.name, bus->dev->name, sizeof(bus->i2c_adap.name));
+
+        bus->i2c_adap.algo_data = bus;
+        i2c_set_adapdata(&bus->i2c_adap, &dev->v4l2_dev);
+        i2c_add_adapter(&bus->i2c_adap);
+
+        bus->i2c_client.adapter = &bus->i2c_adap;
+
+        if (0 == bus->i2c_rc) {
+                if (i2c_scan)
+                        cx231xx_do_i2c_scan(dev, &bus->i2c_client);
+        } else
+                cx231xx_warn("%s: i2c bus %d register FAILED\n",
+                             dev->name, bus->nr);
+
+        return bus->i2c_rc;
+}
+
+/*
+ * cx231xx_i2c_unregister()
+ * unregister i2c_bus
+ */
+int cx231xx_i2c_unregister(struct cx231xx_i2c *bus)
+{
+        i2c_del_adapter(&bus->i2c_adap);
+        return 0;
+}