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fbtft-bus.c
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fbtft-bus.c
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#include <linux/export.h>
#include <linux/errno.h>
#include <linux/gpio.h>
#include <linux/spi/spi.h>
#include "fbtft.h"
/*****************************************************************************
*
* void (*write_reg)(struct fbtft_par *par, int len, ...);
*
*****************************************************************************/
#define define_fbtft_write_reg(func, type, modifier) \
void func(struct fbtft_par *par, int len, ...) \
{ \
va_list args; \
int i, ret; \
int offset = 0; \
type *buf = (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); \
} \
va_end(args); \
fbtft_par_dbg_hex(DEBUG_WRITE_REGISTER, par, par->info->device, type, buf, len, "%s: ", __func__); \
} \
\
va_start(args, len); \
\
if (par->startbyte) { \
*(u8 *)par->buf = par->startbyte; \
buf = (type *)(par->buf + 1); \
offset = 1; \
} \
\
*buf = modifier((type)va_arg(args, unsigned int)); \
if (par->gpio.dc != -1) \
gpio_set_value(par->gpio.dc, 0); \
ret = par->fbtftops.write(par, par->buf, sizeof(type)+offset); \
if (ret < 0) { \
va_end(args); \
dev_err(par->info->device, "%s: write() failed and returned %d\n", __func__, ret); \
return; \
} \
len--; \
\
if (par->startbyte) \
*(u8 *)par->buf = par->startbyte | 0x2; \
\
if (len) { \
i = len; \
while (i--) { \
*buf++ = modifier((type)va_arg(args, unsigned int)); \
} \
if (par->gpio.dc != -1) \
gpio_set_value(par->gpio.dc, 1); \
ret = par->fbtftops.write(par, par->buf, len * (sizeof(type)+offset)); \
if (ret < 0) { \
va_end(args); \
dev_err(par->info->device, "%s: write() failed and returned %d\n", __func__, ret); \
return; \
} \
} \
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, )
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,
"%s: write() failed and returned %d\n", __func__, 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;
u16 *txbuf16 = (u16 *)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_base + offset);
if (par->gpio.dc != -1)
gpio_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 = (u16 *)(par->txbuf.buf + 1);
tx_array_size -= 2;
*(u8 *)(par->txbuf.buf) = par->startbyte | 0x2;
startbyte_size = 1;
}
while (remain) {
to_copy = remain > tx_array_size ? 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_base + offset;
tx_array_size = par->txbuf.len / 2;
while (remain) {
to_copy = remain > tx_array_size ? 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_base + offset);
if (par->gpio.dc != -1)
gpio_set_value(par->gpio.dc, 1);
/* no need for buffered write with 16-bit bus */
return par->fbtftops.write(par, vmem16, len);
}
EXPORT_SYMBOL(fbtft_write_vmem16_bus16);