// SPDX-License-Identifier: GPL-2.0
|
#include <linux/export.h>
|
#include <linux/errno.h>
|
#include <linux/gpio/consumer.h>
|
#include <linux/spi/spi.h>
|
#include "fbtft.h"
|
|
/*****************************************************************************
|
*
|
* void (*write_reg)(struct fbtft_par *par, int len, ...);
|
*
|
*****************************************************************************/
|
|
#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; \
|
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] = modifier((data_type)va_arg(args, \
|
unsigned int)); \
|
} \
|
va_end(args); \
|
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 = (buffer_type *)(par->buf + 1); \
|
offset = 1; \
|
} \
|
\
|
*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--; \
|
\
|
if (par->startbyte) \
|
*(u8 *)par->buf = par->startbyte | 0x2; \
|
\
|
if (len) { \
|
i = len; \
|
while (i--) \
|
*buf++ = modifier((data_type)va_arg(args, \
|
unsigned int)); \
|
fbtft_write_buf_dc(par, par->buf, \
|
len * (sizeof(data_type) + offset), 1); \
|
} \
|
out: \
|
va_end(args); \
|
} \
|
EXPORT_SYMBOL(func);
|
|
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, ...)
|
{
|
va_list args;
|
int i, ret;
|
int pad = 0;
|
u16 *buf = (u16 *)par->buf;
|
|
if (unlikely(par->debug & DEBUG_WRITE_REGISTER)) {
|
va_start(args, len);
|
for (i = 0; i < len; i++)
|
*(((u8 *)buf) + i) = (u8)va_arg(args, unsigned int);
|
va_end(args);
|
fbtft_par_dbg_hex(DEBUG_WRITE_REGISTER, par,
|
par->info->device, u8, buf, len, "%s: ",
|
__func__);
|
}
|
if (len <= 0)
|
return;
|
|
if (par->spi && (par->spi->bits_per_word == 8)) {
|
/* we're emulating 9-bit, pad start of buffer with no-ops
|
* (assuming here that zero is a no-op)
|
*/
|
pad = (len % 4) ? 4 - (len % 4) : 0;
|
for (i = 0; i < pad; i++)
|
*buf++ = 0x000;
|
}
|
|
va_start(args, len);
|
*buf++ = (u8)va_arg(args, unsigned int);
|
i = len - 1;
|
while (i--) {
|
*buf = (u8)va_arg(args, unsigned int);
|
*buf++ |= 0x100; /* dc=1 */
|
}
|
va_end(args);
|
ret = par->fbtftops.write(par, par->buf, (len + pad) * sizeof(u16));
|
if (ret < 0) {
|
dev_err(par->info->device,
|
"write() failed and returned %d\n", ret);
|
return;
|
}
|
}
|
EXPORT_SYMBOL(fbtft_write_reg8_bus9);
|
|
/*****************************************************************************
|
*
|
* int (*write_vmem)(struct fbtft_par *par);
|
*
|
*****************************************************************************/
|
|
/* 16 bit pixel over 8-bit databus */
|
int fbtft_write_vmem16_bus8(struct fbtft_par *par, size_t offset, size_t len)
|
{
|
u16 *vmem16;
|
__be16 *txbuf16 = par->txbuf.buf;
|
size_t remain;
|
size_t to_copy;
|
size_t tx_array_size;
|
int i;
|
int ret = 0;
|
size_t startbyte_size = 0;
|
|
fbtft_par_dbg(DEBUG_WRITE_VMEM, par, "%s(offset=%zu, len=%zu)\n",
|
__func__, offset, len);
|
|
remain = len / 2;
|
vmem16 = (u16 *)(par->info->screen_buffer + offset);
|
|
gpiod_set_value(par->gpio.dc, 1);
|
|
/* non buffered write */
|
if (!par->txbuf.buf)
|
return par->fbtftops.write(par, vmem16, len);
|
|
/* buffered write */
|
tx_array_size = par->txbuf.len / 2;
|
|
if (par->startbyte) {
|
txbuf16 = par->txbuf.buf + 1;
|
tx_array_size -= 2;
|
*(u8 *)(par->txbuf.buf) = par->startbyte | 0x2;
|
startbyte_size = 1;
|
}
|
|
while (remain) {
|
to_copy = min(tx_array_size, remain);
|
dev_dbg(par->info->device, "to_copy=%zu, remain=%zu\n",
|
to_copy, remain - to_copy);
|
|
for (i = 0; i < to_copy; i++)
|
txbuf16[i] = cpu_to_be16(vmem16[i]);
|
|
vmem16 = vmem16 + to_copy;
|
ret = par->fbtftops.write(par, par->txbuf.buf,
|
startbyte_size + to_copy * 2);
|
if (ret < 0)
|
return ret;
|
remain -= to_copy;
|
}
|
|
return ret;
|
}
|
EXPORT_SYMBOL(fbtft_write_vmem16_bus8);
|
|
/* 16 bit pixel over 9-bit SPI bus: dc + high byte, dc + low byte */
|
int fbtft_write_vmem16_bus9(struct fbtft_par *par, size_t offset, size_t len)
|
{
|
u8 *vmem8;
|
u16 *txbuf16 = par->txbuf.buf;
|
size_t remain;
|
size_t to_copy;
|
size_t tx_array_size;
|
int i;
|
int ret = 0;
|
|
fbtft_par_dbg(DEBUG_WRITE_VMEM, par, "%s(offset=%zu, len=%zu)\n",
|
__func__, offset, len);
|
|
if (!par->txbuf.buf) {
|
dev_err(par->info->device, "%s: txbuf.buf is NULL\n", __func__);
|
return -1;
|
}
|
|
remain = len;
|
vmem8 = par->info->screen_buffer + offset;
|
|
tx_array_size = par->txbuf.len / 2;
|
|
while (remain) {
|
to_copy = min(tx_array_size, remain);
|
dev_dbg(par->info->device, "to_copy=%zu, remain=%zu\n",
|
to_copy, remain - to_copy);
|
|
#ifdef __LITTLE_ENDIAN
|
for (i = 0; i < to_copy; i += 2) {
|
txbuf16[i] = 0x0100 | vmem8[i + 1];
|
txbuf16[i + 1] = 0x0100 | vmem8[i];
|
}
|
#else
|
for (i = 0; i < to_copy; i++)
|
txbuf16[i] = 0x0100 | vmem8[i];
|
#endif
|
vmem8 = vmem8 + to_copy;
|
ret = par->fbtftops.write(par, par->txbuf.buf, to_copy * 2);
|
if (ret < 0)
|
return ret;
|
remain -= to_copy;
|
}
|
|
return ret;
|
}
|
EXPORT_SYMBOL(fbtft_write_vmem16_bus9);
|
|
int fbtft_write_vmem8_bus8(struct fbtft_par *par, size_t offset, size_t len)
|
{
|
dev_err(par->info->device, "%s: function not implemented\n", __func__);
|
return -1;
|
}
|
EXPORT_SYMBOL(fbtft_write_vmem8_bus8);
|
|
/* 16 bit pixel over 16-bit databus */
|
int fbtft_write_vmem16_bus16(struct fbtft_par *par, size_t offset, size_t len)
|
{
|
u16 *vmem16;
|
|
fbtft_par_dbg(DEBUG_WRITE_VMEM, par, "%s(offset=%zu, len=%zu)\n",
|
__func__, offset, len);
|
|
vmem16 = (u16 *)(par->info->screen_buffer + offset);
|
|
/* no need for buffered write with 16-bit bus */
|
return fbtft_write_buf_dc(par, vmem16, len, 1);
|
}
|
EXPORT_SYMBOL(fbtft_write_vmem16_bus16);
|
