V4L/DVB: tm6000: add send and recv function

Split the i2c send and receive functions on separate functions

[mchehab@redhat.com: CodingStyle and fix the logic for more than 2 read values]
Signed-off-by: Stefan Ringel <stefan.ringel@arcor.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/staging/tm6000/tm6000-i2c.c b/drivers/staging/tm6000/tm6000-i2c.c
index fa11173e0fad6b17c7a88660d6324ee547f4cfaa..a5323303c34ac62ac9ea5c41feb21c1e74c6e097 100644 (file)
--- a/drivers/staging/tm6000/tm6000-i2c.c
+++ b/drivers/staging/tm6000/tm6000-i2c.c
@@ -44,6 +44,36 @@ MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]");
                        printk(KERN_DEBUG "%s at %s: " fmt, \
                        dev->name, __FUNCTION__ , ##args); } while (0)
 
+static int tm6000_i2c_send_regs(struct tm6000_core *dev, unsigned char addr,
+                               __u8 reg, char *buf, int len)
+{
+       return 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);
+}
+
+/* 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;
+
+       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);
+
+       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)
+{
+       return 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);
+}
+
 static int tm6000_i2c_xfer(struct i2c_adapter *i2c_adap,
                           struct i2c_msg msgs[], int num)
 {
@@ -78,13 +108,16 @@ static int tm6000_i2c_xfer(struct i2c_adapter *i2c_adap,
                        i2c_dprintk(2, "; joined to read %s len=%d:",
                                    i == num - 2 ? "stop" : "nonstop",
                                    msgs[i + 1].len);
-                       rc = tm6000_read_write_usb (dev,
-                               USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
-                               msgs[i].len == 1 ? REQ_16_SET_GET_I2C_WR1_RDN
-                                                : REQ_14_SET_GET_I2C_WR2_RDN,
-                               addr | msgs[i].buf[0] << 8,
-                               msgs[i].len == 1 ? 0 : msgs[i].buf[1],
-                               msgs[i + 1].buf, 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) {
@@ -99,10 +132,7 @@ static int tm6000_i2c_xfer(struct i2c_adapter *i2c_adap,
                        if (i2c_debug >= 2)
                                for (byte = 0; byte < msgs[i].len; byte++)
                                        printk(" %02x", msgs[i].buf[byte]);
-                       rc = tm6000_read_write_usb(dev,
-                               USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
-                               REQ_16_SET_GET_I2C_WR1_RDN,
-                               addr | msgs[i].buf[0] << 8, 0,
+                       rc = tm6000_i2c_send_regs(dev, addr, msgs[i].buf[0],
                                msgs[i].buf + 1, msgs[i].len - 1);
 
                        if (addr == dev->tuner_addr  << 1) {
@@ -134,9 +164,7 @@ static int tm6000_i2c_eeprom(struct tm6000_core *dev,
        bytes[16] = '\0';
        for (i = 0; i < len; ) {
        *p = i;
-       rc = tm6000_read_write_usb (dev,
-               USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
-               REQ_16_SET_GET_I2C_WR1_RDN, 0xa0 | i<<8, 0, p, 1);
+       rc = tm6000_i2c_recv_regs(dev, 0xa0, i, p, 1);
                if (rc < 1) {
                        if (p == eedata)
                                goto noeeprom;