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Subject[PATCH v2] staging: fbtft: differentiate between buffer and data types to fix sparse warning
Date
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@free-electrons.com>
Signed-off-by: Alfonso Lima Astor <alfonsolimaastor@gmail.com>

---
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
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