1 files changed, 340 insertions, 0 deletions

diff --git a/drivers/media/video/tm6000/tm6000-i2c.c b/drivers/media/video/tm6000/tm6000-i2c.c
new file mode 100644
index 000000000000..0290bbf00c3e
--- /dev/null
+++ b/drivers/media/video/tm6000/tm6000-i2c.c
@@ -0,0 +1,340 @@
+/*
+ *  tm6000-i2c.c - driver for TM5600/TM6000/TM6010 USB video capture devices
+ *
+ *  Copyright (C) 2006-2007 Mauro Carvalho Chehab <mchehab@infradead.org>
+ *
+ *  Copyright (C) 2007 Michel Ludwig <michel.ludwig@gmail.com>
+ *      - Fix SMBus Read Byte command
+ *
+ *  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 version 2
+ *
+ *  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 "tm6000.h"
+#include "tm6000-regs.h"
+#include <media/v4l2-common.h>
+#include <media/tuner.h>
+#include "tuner-xc2028.h"
+
+
+/* ----------------------------------------------------------- */
+
+static unsigned int i2c_debug;
+module_param(i2c_debug, int, 0644);
+MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]");
+
+#define i2c_dprintk(lvl, fmt, args...) if (i2c_debug >= lvl) do { \
+                        printk(KERN_DEBUG "%s at %s: " fmt, \
+                        dev->name, __func__, ##args); } while (0)
+
+static int tm6000_i2c_send_regs(struct tm6000_core *dev, unsigned char addr,
+                                __u8 reg, char *buf, int len)
+{
+        int rc;
+        unsigned int tsleep;
+        unsigned int i2c_packet_limit = 16;
+
+        if (dev->dev_type == TM6010)
+                i2c_packet_limit = 64;
+
+        if (!buf)
+                return -1;
+
+        if (len < 1 || len > i2c_packet_limit) {
+                printk(KERN_ERR "Incorrect length of i2c packet = %d, limit set to %d\n",
+                        len, i2c_packet_limit);
+                return -1;
+        }
+
+        /* capture mutex */
+        rc = tm6000_read_write_usb(dev, USB_DIR_OUT | USB_TYPE_VENDOR |
+                USB_RECIP_DEVICE, REQ_16_SET_GET_I2C_WR1_RDN,
+                addr | reg << 8, 0, buf, len);
+
+        if (rc < 0) {
+                /* release mutex */
+                return rc;
+        }
+
+        /* Calculate delay time, 14000us for 64 bytes */
+        tsleep = ((len * 200) + 200 + 1000) / 1000;
+        msleep(tsleep);
+
+        /* release mutex */
+        return rc;
+}
+
+/* Generic read - doesn't work fine with 16bit registers */
+static int tm6000_i2c_recv_regs(struct tm6000_core *dev, unsigned char addr,
+                                __u8 reg, char *buf, int len)
+{
+        int rc;
+        u8 b[2];
+        unsigned int i2c_packet_limit = 16;
+
+        if (dev->dev_type == TM6010)
+                i2c_packet_limit = 64;
+
+        if (!buf)
+                return -1;
+
+        if (len < 1 || len > i2c_packet_limit) {
+                printk(KERN_ERR "Incorrect length of i2c packet = %d, limit set to %d\n",
+                        len, i2c_packet_limit);
+                return -1;
+        }
+
+        /* capture mutex */
+        if ((dev->caps.has_zl10353) && (dev->demod_addr << 1 == addr) && (reg % 2 == 0)) {
+                /*
+                 * Workaround an I2C bug when reading from zl10353
+                 */
+                reg -= 1;
+                len += 1;
+
+                rc = tm6000_read_write_usb(dev, USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
+                        REQ_16_SET_GET_I2C_WR1_RDN, addr | reg << 8, 0, b, len);
+
+                *buf = b[1];
+        } else {
+                rc = tm6000_read_write_usb(dev, USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
+                        REQ_16_SET_GET_I2C_WR1_RDN, addr | reg << 8, 0, buf, len);
+        }
+
+        /* release mutex */
+        return rc;
+}
+
+/*
+ * read from a 16bit register
+ * for example xc2028, xc3028 or xc3028L
+ */
+static int tm6000_i2c_recv_regs16(struct tm6000_core *dev, unsigned char addr,
+                                  __u16 reg, char *buf, int len)
+{
+        int rc;
+        unsigned char ureg;
+
+        if (!buf || len != 2)
+                return -1;
+
+        /* capture mutex */
+        if (dev->dev_type == TM6010) {
+                ureg = reg & 0xFF;
+                rc = tm6000_read_write_usb(dev, USB_DIR_OUT | USB_TYPE_VENDOR |
+                        USB_RECIP_DEVICE, REQ_16_SET_GET_I2C_WR1_RDN,
+                        addr | (reg & 0xFF00), 0, &ureg, 1);
+
+                if (rc < 0) {
+                        /* release mutex */
+                        return rc;
+                }
+
+                msleep(1400 / 1000);
+                rc = tm6000_read_write_usb(dev, USB_DIR_IN | USB_TYPE_VENDOR |
+                        USB_RECIP_DEVICE, REQ_35_AFTEK_TUNER_READ,
+                        reg, 0, buf, len);
+        } else {
+                rc = tm6000_read_write_usb(dev, USB_DIR_IN | USB_TYPE_VENDOR |
+                        USB_RECIP_DEVICE, REQ_14_SET_GET_I2C_WR2_RDN,
+                        addr, reg, buf, len);
+        }
+
+        /* release mutex */
+        return rc;
+}
+
+static int tm6000_i2c_xfer(struct i2c_adapter *i2c_adap,
+                           struct i2c_msg msgs[], int num)
+{
+        struct tm6000_core *dev = i2c_adap->algo_data;
+        int addr, rc, i, byte;
+
+        if (num <= 0)
+                return 0;
+        for (i = 0; i < num; i++) {
+                addr = (msgs[i].addr << 1) & 0xff;
+                i2c_dprintk(2, "%s %s addr=0x%x len=%d:",
+                         (msgs[i].flags & I2C_M_RD) ? "read" : "write",
+                         i == num - 1 ? "stop" : "nonstop", addr, msgs[i].len);
+                if (msgs[i].flags & I2C_M_RD) {
+                        /* read request without preceding register selection */
+                        /*
+                         * The TM6000 only supports a read transaction
+                         * immediately after a 1 or 2 byte write to select
+                         * a register.  We cannot fulfil this request.
+                         */
+                        i2c_dprintk(2, " read without preceding write not"
+                                       " supported");
+                        rc = -EOPNOTSUPP;
+                        goto err;
+                } else if (i + 1 < num && msgs[i].len <= 2 &&
+                           (msgs[i + 1].flags & I2C_M_RD) &&
+                           msgs[i].addr == msgs[i + 1].addr) {
+                        /* 1 or 2 byte write followed by a read */
+                        if (i2c_debug >= 2)
+                                for (byte = 0; byte < msgs[i].len; byte++)
+                                        printk(KERN_CONT " %02x", msgs[i].buf[byte]);
+                        i2c_dprintk(2, "; joined to read %s len=%d:",
+                                    i == num - 2 ? "stop" : "nonstop",
+                                    msgs[i + 1].len);
+
+                        if (msgs[i].len == 2) {
+                                rc = tm6000_i2c_recv_regs16(dev, addr,
+                                        msgs[i].buf[0] << 8 | msgs[i].buf[1],
+                                        msgs[i + 1].buf, msgs[i + 1].len);
+                        } else {
+                                rc = tm6000_i2c_recv_regs(dev, addr, msgs[i].buf[0],
+                                        msgs[i + 1].buf, msgs[i + 1].len);
+                        }
+
+                        i++;
+
+                        if (addr == dev->tuner_addr << 1) {
+                                tm6000_set_reg(dev, REQ_50_SET_START, 0, 0);
+                                tm6000_set_reg(dev, REQ_51_SET_STOP, 0, 0);
+                        }
+                        if (i2c_debug >= 2)
+                                for (byte = 0; byte < msgs[i].len; byte++)
+                                        printk(KERN_CONT " %02x", msgs[i].buf[byte]);
+                } else {
+                        /* write bytes */
+                        if (i2c_debug >= 2)
+                                for (byte = 0; byte < msgs[i].len; byte++)
+                                        printk(KERN_CONT " %02x", msgs[i].buf[byte]);
+                        rc = tm6000_i2c_send_regs(dev, addr, msgs[i].buf[0],
+                                msgs[i].buf + 1, msgs[i].len - 1);
+                }
+                if (i2c_debug >= 2)
+                        printk(KERN_CONT "\n");
+                if (rc < 0)
+                        goto err;
+        }
+
+        return num;
+err:
+        i2c_dprintk(2, " ERROR: %i\n", rc);
+        return rc;
+}
+
+static int tm6000_i2c_eeprom(struct tm6000_core *dev)
+{
+        int i, rc;
+        unsigned char *p = dev->eedata;
+        unsigned char bytes[17];
+
+        dev->i2c_client.addr = 0xa0 >> 1;
+        dev->eedata_size = 0;
+
+        bytes[16] = '\0';
+        for (i = 0; i < sizeof(dev->eedata); ) {
+                *p = i;
+                rc = tm6000_i2c_recv_regs(dev, 0xa0, i, p, 1);
+                if (rc < 1) {
+                        if (p == dev->eedata)
+                                goto noeeprom;
+                        else {
+                                printk(KERN_WARNING
+                                "%s: i2c eeprom read error (err=%d)\n",
+                                dev->name, rc);
+                        }
+                        return -EINVAL;
+                }
+                dev->eedata_size++;
+                p++;
+                if (0 == (i % 16))
+                        printk(KERN_INFO "%s: i2c eeprom %02x:", dev->name, i);
+                printk(KERN_CONT " %02x", dev->eedata[i]);
+                if ((dev->eedata[i] >= ' ') && (dev->eedata[i] <= 'z'))
+                        bytes[i%16] = dev->eedata[i];
+                else
+                        bytes[i%16] = '.';
+
+                i++;
+
+                if (0 == (i % 16)) {
+                        bytes[16] = '\0';
+                        printk(KERN_CONT "  %s\n", bytes);
+                }
+        }
+        if (0 != (i%16)) {
+                bytes[i%16] = '\0';
+                for (i %= 16; i < 16; i++)
+                        printk(KERN_CONT "   ");
+                printk(KERN_CONT "  %s\n", bytes);
+        }
+
+        return 0;
+
+noeeprom:
+        printk(KERN_INFO "%s: Huh, no eeprom present (err=%d)?\n",
+               dev->name, rc);
+        return -EINVAL;
+}
+
+/* ----------------------------------------------------------- */
+
+/*
+ * functionality()
+ */
+static u32 functionality(struct i2c_adapter *adap)
+{
+        return I2C_FUNC_SMBUS_EMUL;
+}
+
+static const struct i2c_algorithm tm6000_algo = {
+        .master_xfer   = tm6000_i2c_xfer,
+        .functionality = functionality,
+};
+
+/* ----------------------------------------------------------- */
+
+/*
+ * tm6000_i2c_register()
+ * register i2c bus
+ */
+int tm6000_i2c_register(struct tm6000_core *dev)
+{
+        int rc;
+
+        dev->i2c_adap.owner = THIS_MODULE;
+        dev->i2c_adap.algo = &tm6000_algo;
+        dev->i2c_adap.dev.parent = &dev->udev->dev;
+        strlcpy(dev->i2c_adap.name, dev->name, sizeof(dev->i2c_adap.name));
+        dev->i2c_adap.algo_data = dev;
+        i2c_set_adapdata(&dev->i2c_adap, &dev->v4l2_dev);
+        rc = i2c_add_adapter(&dev->i2c_adap);
+        if (rc)
+                return rc;
+
+        dev->i2c_client.adapter = &dev->i2c_adap;
+        strlcpy(dev->i2c_client.name, "tm6000 internal", I2C_NAME_SIZE);
+        tm6000_i2c_eeprom(dev);
+
+        return 0;
+}
+
+/*
+ * tm6000_i2c_unregister()
+ * unregister i2c_bus
+ */
+int tm6000_i2c_unregister(struct tm6000_core *dev)
+{
+        i2c_del_adapter(&dev->i2c_adap);
+        return 0;
+}