1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
|
// 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);
if (!par->gpio.dc)
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);
|
