V4L/DVB (4960): Removal of unused code from usbvision-i2c.c

i2c_adap is almost not used. This patch removes it, cleaning the i2c support,
and improving driver understanding.
Thanks to Thierry Merle for testing it.

Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

diff --git a/drivers/media/video/usbvision/usbvision-i2c.c b/drivers/media/video/usbvision/usbvision-i2c.c
index 9540bd0..efcd25b 100644 (file)
--- a/drivers/media/video/usbvision/usbvision-i2c.c
+++ b/drivers/media/video/usbvision/usbvision-i2c.c
@@ -58,7 +58,6 @@ static int usbvision_i2c_read(void *data, unsigned char addr, char *buf,
 static inline int try_write_address(struct i2c_adapter *i2c_adap,
                                    unsigned char addr, int retries)
 {
-       struct i2c_algo_usb_data *adap = i2c_adap->algo_data;
        void *data;
        int i, ret = -1;
        char buf[4];
@@ -69,10 +68,10 @@ static inline int try_write_address(struct i2c_adapter *i2c_adap,
                ret = (usbvision_i2c_write(data, addr, buf, 1));
                if (ret == 1)
                        break;  /* success! */
-               udelay(5 /*adap->udelay */ );
+               udelay(5);
                if (i == retries)       /* no success */
                        break;
-               udelay(adap->udelay);
+               udelay(10);
        }
        if (i) {
                PDEBUG(DBG_ALGO,"Needed %d retries for address %#2x", i, addr);
@@ -84,7 +83,6 @@ static inline int try_write_address(struct i2c_adapter *i2c_adap,
 static inline int try_read_address(struct i2c_adapter *i2c_adap,
                                   unsigned char addr, int retries)
 {
-       struct i2c_algo_usb_data *adap = i2c_adap->algo_data;
        void *data;
        int i, ret = -1;
        char buf[4];
@@ -94,10 +92,10 @@ static inline int try_read_address(struct i2c_adapter *i2c_adap,
                ret = (usbvision_i2c_read(data, addr, buf, 1));
                if (ret == 1)
                        break;  /* success! */
-               udelay(5 /*adap->udelay */ );
+               udelay(5);
                if (i == retries)       /* no success */
                        break;
-               udelay(adap->udelay);
+               udelay(10);
        }
        if (i) {
                PDEBUG(DBG_ALGO,"Needed %d retries for address %#2x", i, addr);
@@ -248,15 +246,12 @@ int usbvision_i2c_usb_del_bus(struct i2c_adapter *adap)
 /* usbvision specific I2C functions                                        */
 /* ----------------------------------------------------------------------- */
 static struct i2c_adapter i2c_adap_template;
-static struct i2c_algo_usb_data i2c_algo_template;
 static struct i2c_client i2c_client_template;
 
 int usbvision_init_i2c(struct usb_usbvision *usbvision)
 {
        memcpy(&usbvision->i2c_adap, &i2c_adap_template,
               sizeof(struct i2c_adapter));
-       memcpy(&usbvision->i2c_algo, &i2c_algo_template,
-              sizeof(struct i2c_algo_usb_data));
        memcpy(&usbvision->i2c_client, &i2c_client_template,
               sizeof(struct i2c_client));
 
@@ -266,9 +261,7 @@ int usbvision_init_i2c(struct usb_usbvision *usbvision)
 
        i2c_set_adapdata(&usbvision->i2c_adap, usbvision);
        i2c_set_clientdata(&usbvision->i2c_client, usbvision);
-       i2c_set_algo_usb_data(&usbvision->i2c_algo, usbvision);
 
-       usbvision->i2c_adap.algo_data = &usbvision->i2c_algo;
        usbvision->i2c_client.adapter = &usbvision->i2c_adap;
 
        if (usbvision_write_reg(usbvision, USBVISION_SER_MODE, USBVISION_IIC_LRNACK) < 0) {
@@ -297,7 +290,6 @@ int usbvision_init_i2c(struct usb_usbvision *usbvision)
 void call_i2c_clients(struct usb_usbvision *usbvision, unsigned int cmd,
                      void *arg)
 {
-       BUG_ON(NULL == usbvision->i2c_adap.algo_data);
        i2c_clients_command(&usbvision->i2c_adap, cmd, arg);
 }
 
@@ -531,21 +523,10 @@ static int usbvision_i2c_read(void *data, unsigned char addr, char *buf,
        return rdcount;
 }
 
-static struct i2c_algo_usb_data i2c_algo_template = {
-       .data           = NULL,
-       .inb            = usbvision_i2c_read,
-       .outb           = usbvision_i2c_write,
-       .udelay         = 10,
-       .mdelay         = 10,
-       .timeout        = 100,
-};
-
 static struct i2c_adapter i2c_adap_template = {
        .owner = THIS_MODULE,
        .name              = "usbvision",
        .id                = I2C_HW_B_BT848, /* FIXME */
-       .algo              = NULL,
-       .algo_data         = NULL,
        .client_register   = attach_inform,
        .client_unregister = detach_inform,
 #ifdef I2C_ADAP_CLASS_TV_ANALOG

diff --git a/drivers/media/video/usbvision/usbvision.h b/drivers/media/video/usbvision/usbvision.h
index 5ad07f8..b1645f9 100644 (file)
--- a/drivers/media/video/usbvision/usbvision.h
+++ b/drivers/media/video/usbvision/usbvision.h
@@ -219,18 +219,6 @@ enum {
        ((udevice)->last_error == 0) && \
        (!(udevice)->remove_pending))
 
-/* I2C structures */
-struct i2c_algo_usb_data {
-       void *data;             /* private data for lowlevel routines */
-       int (*inb) (void *data, unsigned char addr, char *buf, short len);
-       int (*outb) (void *data, unsigned char addr, char *buf, short len);
-
-       /* local settings */
-       int udelay;
-       int mdelay;
-       int timeout;
-};
-
 #define I2C_USB_ADAP_MAX       16
 
 /* ----------------------------------------------------------------- */
@@ -383,7 +371,6 @@ struct usb_usbvision {
 
        /* i2c Declaration Section*/
        struct i2c_adapter i2c_adap;
-       struct i2c_algo_usb_data i2c_algo;
        struct i2c_client i2c_client;
 
        struct urb *ctrlUrb;
@@ -491,16 +478,6 @@ struct usb_usbvision {
 
 int usbvision_i2c_usb_del_bus(struct i2c_adapter *);
 
-static inline void *i2c_get_algo_usb_data (struct i2c_algo_usb_data *dev)
-{
-       return dev->data;
-}
-
-static inline void i2c_set_algo_usb_data (struct i2c_algo_usb_data *dev, void *data)
-{
-       dev->data = data;
-}
-
 
 /* ----------------------------------------------------------------------- */
 /* usbvision specific I2C functions                                        */