[PATCH v2] staging: fbtft: differentiate between buffer and data types to fix sparse warning

[Alfonso Lima Astor]

sparse was complaning about an incorrect type cast:
drivers/staging/fbtft/fbtft-bus.c:60:1: warning: incorrect type in assignment (different base types)
drivers/staging/fbtft/fbtft-bus.c:60:1:    expected unsigned short [unsigned] [short] [usertype] <noident>
drivers/staging/fbtft/fbtft-bus.c:60:1:    got restricted __be16 [usertype] <noident>
drivers/staging/fbtft/fbtft-bus.c:60:1: warning: incorrect type in assignment (different base types)
drivers/staging/fbtft/fbtft-bus.c:60:1:    expected unsigned short [unsigned] [short] [usertype] <noident>
drivers/staging/fbtft/fbtft-bus.c:60:1:    got restricted __be16 [usertype] <noident>

The solution is to add an extra parameter to the macro to
differentiate between buffer type and data type.

Cc: Thomas Petazzoni <thomas.petazzoni@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Alfonso Lima Astor <alfonsolimaastor@xxxxxxxxx>

---
changes for v2:
	Add maintainer to CC and add result of macro below '---'
	to ease review of changes.

For "fbtft_write_reg8_bus8" and "fbtft_write_reg16_bus16 result"
is the same before and after patch. For "fbtft_write_reg16_bus8"
macro result after patch is:

void fbtft_write_reg16_bus8(struct fbtft_par *par, int len, ...)
{
	va_list args;
	int i, ret;
	int offset = 0;
	__be16 *buf = (__be16 *)par->buf;

	if (unlikely(par->debug & DEBUG_WRITE_REGISTER)) {
		va_start(args, len);
		for (i = 0; i < len; i++) {
			buf[i] = cpu_to_be16((u16)va_arg(args, unsigned int));
		}
		va_end(args);
		fbtft_par_dbg_hex(DEBUG_WRITE_REGISTER, par, par->info->device, __be16, buf, len, "%s: ", __func__);
	}

	va_start(args, len);

	if (par->startbyte) {
		*(u8 *)par->buf = par->startbyte;
		buf = (__be16 *)(par->buf + 1);
		offset = 1;
	}

	*buf = cpu_to_be16((u16)va_arg(args, unsigned int));
	ret = fbtft_write_buf_dc(par, par->buf, sizeof(u16) + offset, 0);
	if (ret < 0)
		goto out;
	len--;

	if (par->startbyte)
		*(u8 *)par->buf = par->startbyte | 0x2;

	if (len) {
		i = len;
		while (i--)
			*buf++ = cpu_to_be16((u16)va_arg(args, unsigned int));
		fbtft_write_buf_dc(par, par->buf,
				   len * (sizeof(u16) + offset), 1);
	}
out:
	va_end(args);
}

 drivers/staging/fbtft/fbtft-bus.c | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/drivers/staging/fbtft/fbtft-bus.c b/drivers/staging/fbtft/fbtft-bus.c
index a80b5d1..81e8af7 100644
--- a/drivers/staging/fbtft/fbtft-bus.c
+++ b/drivers/staging/fbtft/fbtft-bus.c
@@ -10,33 +10,33 @@
  *
  *****************************************************************************/
 
-#define define_fbtft_write_reg(func, type, modifier)                          \
+#define define_fbtft_write_reg(func, buffer_type, data_type, modifier)        \
 void func(struct fbtft_par *par, int len, ...)                                \
 {                                                                             \
 	va_list args;                                                         \
 	int i, ret;                                                           \
 	int offset = 0;                                                       \
-	type *buf = (type *)par->buf;                                         \
+	buffer_type *buf = (buffer_type *)par->buf;                           \
 									      \
 	if (unlikely(par->debug & DEBUG_WRITE_REGISTER)) {                    \
 		va_start(args, len);                                          \
 		for (i = 0; i < len; i++) {                                   \
-			buf[i] = (type)va_arg(args, unsigned int);            \
+			buf[i] = modifier((data_type)va_arg(args, unsigned int)); \
 		}                                                             \
 		va_end(args);                                                 \
-		fbtft_par_dbg_hex(DEBUG_WRITE_REGISTER, par, par->info->device, type, buf, len, "%s: ", __func__);   \
+		fbtft_par_dbg_hex(DEBUG_WRITE_REGISTER, par, par->info->device, buffer_type, buf, len, "%s: ", __func__); \
 	}                                                                     \
 									      \
 	va_start(args, len);                                                  \
 									      \
 	if (par->startbyte) {                                                 \
 		*(u8 *)par->buf = par->startbyte;                             \
-		buf = (type *)(par->buf + 1);                                 \
+		buf = (buffer_type *)(par->buf + 1);                          \
 		offset = 1;                                                   \
 	}                                                                     \
 									      \
-	*buf = modifier((type)va_arg(args, unsigned int));                    \
-	ret = fbtft_write_buf_dc(par, par->buf, sizeof(type) + offset, 0);    \
+	*buf = modifier((data_type)va_arg(args, unsigned int));               \
+	ret = fbtft_write_buf_dc(par, par->buf, sizeof(data_type) + offset, 0); \
 	if (ret < 0)							      \
 		goto out;						      \
 	len--;                                                                \
@@ -47,18 +47,18 @@ void func(struct fbtft_par *par, int len, ...)                                \
 	if (len) {                                                            \
 		i = len;                                                      \
 		while (i--)						      \
-			*buf++ = modifier((type)va_arg(args, unsigned int));  \
+			*buf++ = modifier((data_type)va_arg(args, unsigned int)); \
 		fbtft_write_buf_dc(par, par->buf,			      \
-				   len * (sizeof(type) + offset), 1);	      \
+				   len * (sizeof(data_type) + offset), 1);    \
 	}                                                                     \
 out:									      \
 	va_end(args);                                                         \
 }                                                                             \
 EXPORT_SYMBOL(func);
 
-define_fbtft_write_reg(fbtft_write_reg8_bus8, u8, )
-define_fbtft_write_reg(fbtft_write_reg16_bus8, u16, cpu_to_be16)
-define_fbtft_write_reg(fbtft_write_reg16_bus16, u16, )
+define_fbtft_write_reg(fbtft_write_reg8_bus8, u8, u8, )
+define_fbtft_write_reg(fbtft_write_reg16_bus8, __be16, u16, cpu_to_be16)
+define_fbtft_write_reg(fbtft_write_reg16_bus16, u16, u16, )
 
 void fbtft_write_reg8_bus9(struct fbtft_par *par, int len, ...)
 {
-- 
2.7.4