|
| 1 | +#include <linux/export.h> |
| 2 | +#include <linux/errno.h> |
| 3 | +#include <linux/gpio.h> |
| 4 | +#include <linux/spi/spi.h> |
| 5 | +#include "fbtft.h" |
| 6 | + |
| 7 | + |
| 8 | + |
| 9 | + |
| 10 | +/***************************************************************************** |
| 11 | + * |
| 12 | + * void (*write_reg)(struct fbtft_par *par, int len, ...); |
| 13 | + * |
| 14 | + *****************************************************************************/ |
| 15 | + |
| 16 | +#define define_fbtft_write_reg(func, type, modifier) \ |
| 17 | +void func(struct fbtft_par *par, int len, ...) \ |
| 18 | +{ \ |
| 19 | + va_list args; \ |
| 20 | + int i, ret; \ |
| 21 | + int offset = 0; \ |
| 22 | + type *buf = (type *)par->buf; \ |
| 23 | + \ |
| 24 | + if (unlikely(par->debug & DEBUG_WRITE_REGISTER)) { \ |
| 25 | + va_start(args, len); \ |
| 26 | + for (i = 0; i < len; i++) { \ |
| 27 | + buf[i] = (type)va_arg(args, unsigned int); \ |
| 28 | + } \ |
| 29 | + va_end(args); \ |
| 30 | + fbtft_par_dbg_hex(DEBUG_WRITE_REGISTER, par, par->info->device, type, buf, len, "%s: ", __func__); \ |
| 31 | + } \ |
| 32 | + \ |
| 33 | + va_start(args, len); \ |
| 34 | + \ |
| 35 | + if (par->startbyte) { \ |
| 36 | + *(u8 *)par->buf = par->startbyte; \ |
| 37 | + buf = (type *)(par->buf + 1); \ |
| 38 | + offset = 1; \ |
| 39 | + } \ |
| 40 | + \ |
| 41 | + *buf = modifier((type)va_arg(args, unsigned int)); \ |
| 42 | + if (par->gpio.dc != -1) \ |
| 43 | + gpio_set_value(par->gpio.dc, 0); \ |
| 44 | + ret = par->fbtftops.write(par, par->buf, sizeof(type)+offset); \ |
| 45 | + if (ret < 0) { \ |
| 46 | + va_end(args); \ |
| 47 | + dev_err(par->info->device, "%s: write() failed and returned %d\n", __func__, ret); \ |
| 48 | + return; \ |
| 49 | + } \ |
| 50 | + len--; \ |
| 51 | + \ |
| 52 | + if (par->startbyte) \ |
| 53 | + *(u8 *)par->buf = par->startbyte | 0x2; \ |
| 54 | + \ |
| 55 | + if (len) { \ |
| 56 | + i = len; \ |
| 57 | + while (i--) { \ |
| 58 | + *buf++ = modifier((type)va_arg(args, unsigned int)); \ |
| 59 | + } \ |
| 60 | + if (par->gpio.dc != -1) \ |
| 61 | + gpio_set_value(par->gpio.dc, 1); \ |
| 62 | + ret = par->fbtftops.write(par, par->buf, len * (sizeof(type)+offset)); \ |
| 63 | + if (ret < 0) { \ |
| 64 | + va_end(args); \ |
| 65 | + dev_err(par->info->device, "%s: write() failed and returned %d\n", __func__, ret); \ |
| 66 | + return; \ |
| 67 | + } \ |
| 68 | + } \ |
| 69 | + va_end(args); \ |
| 70 | +} \ |
| 71 | +EXPORT_SYMBOL(func); |
| 72 | + |
| 73 | +define_fbtft_write_reg(fbtft_write_reg8_bus8, u8, ) |
| 74 | +define_fbtft_write_reg(fbtft_write_reg16_bus8, u16, cpu_to_be16) |
| 75 | +define_fbtft_write_reg(fbtft_write_reg16_bus16, u16, ) |
| 76 | + |
| 77 | +void fbtft_write_reg8_bus9(struct fbtft_par *par, int len, ...) |
| 78 | +{ |
| 79 | + va_list args; |
| 80 | + int i, ret; |
| 81 | + int pad = 0; |
| 82 | + u16 *buf = (u16 *)par->buf; |
| 83 | + |
| 84 | + if (unlikely(par->debug & DEBUG_WRITE_REGISTER)) { |
| 85 | + va_start(args, len); |
| 86 | + for (i = 0; i < len; i++) |
| 87 | + *(((u8 *)buf) + i) = (u8)va_arg(args, unsigned int); |
| 88 | + va_end(args); |
| 89 | + fbtft_par_dbg_hex(DEBUG_WRITE_REGISTER, par, |
| 90 | + par->info->device, u8, buf, len, "%s: ", __func__); |
| 91 | + } |
| 92 | + if (len <= 0) |
| 93 | + return; |
| 94 | + |
| 95 | + if (par->spi && (par->spi->bits_per_word == 8)) { |
| 96 | + /* we're emulating 9-bit, pad start of buffer with no-ops |
| 97 | + (assuming here that zero is a no-op) */ |
| 98 | + pad = (len % 4) ? 4 - (len % 4) : 0; |
| 99 | + for (i = 0; i < pad; i++) |
| 100 | + *buf++ = 0x000; |
| 101 | + } |
| 102 | + |
| 103 | + va_start(args, len); |
| 104 | + *buf++ = (u8)va_arg(args, unsigned int); |
| 105 | + i = len - 1; |
| 106 | + while (i--) { |
| 107 | + *buf = (u8)va_arg(args, unsigned int); |
| 108 | + *buf++ |= 0x100; /* dc=1 */ |
| 109 | + } |
| 110 | + va_end(args); |
| 111 | + ret = par->fbtftops.write(par, par->buf, (len + pad) * sizeof(u16)); |
| 112 | + if (ret < 0) { |
| 113 | + dev_err(par->info->device, |
| 114 | + "%s: write() failed and returned %d\n", __func__, ret); |
| 115 | + return; |
| 116 | + } |
| 117 | +} |
| 118 | +EXPORT_SYMBOL(fbtft_write_reg8_bus9); |
| 119 | + |
| 120 | + |
| 121 | + |
| 122 | + |
| 123 | +/***************************************************************************** |
| 124 | + * |
| 125 | + * int (*write_vmem)(struct fbtft_par *par); |
| 126 | + * |
| 127 | + *****************************************************************************/ |
| 128 | + |
| 129 | +/* 16 bit pixel over 8-bit databus */ |
| 130 | +int fbtft_write_vmem16_bus8(struct fbtft_par *par, size_t offset, size_t len) |
| 131 | +{ |
| 132 | + u16 *vmem16; |
| 133 | + u16 *txbuf16 = (u16 *)par->txbuf.buf; |
| 134 | + size_t remain; |
| 135 | + size_t to_copy; |
| 136 | + size_t tx_array_size; |
| 137 | + int i; |
| 138 | + int ret = 0; |
| 139 | + size_t startbyte_size = 0; |
| 140 | + |
| 141 | + fbtft_par_dbg(DEBUG_WRITE_VMEM, par, "%s(offset=%zu, len=%zu)\n", |
| 142 | + __func__, offset, len); |
| 143 | + |
| 144 | + remain = len / 2; |
| 145 | + vmem16 = (u16 *)(par->info->screen_base + offset); |
| 146 | + |
| 147 | + if (par->gpio.dc != -1) |
| 148 | + gpio_set_value(par->gpio.dc, 1); |
| 149 | + |
| 150 | + /* non buffered write */ |
| 151 | + if (!par->txbuf.buf) |
| 152 | + return par->fbtftops.write(par, vmem16, len); |
| 153 | + |
| 154 | + /* buffered write */ |
| 155 | + tx_array_size = par->txbuf.len / 2; |
| 156 | + |
| 157 | + if (par->startbyte) { |
| 158 | + txbuf16 = (u16 *)(par->txbuf.buf + 1); |
| 159 | + tx_array_size -= 2; |
| 160 | + *(u8 *)(par->txbuf.buf) = par->startbyte | 0x2; |
| 161 | + startbyte_size = 1; |
| 162 | + } |
| 163 | + |
| 164 | + while (remain) { |
| 165 | + to_copy = remain > tx_array_size ? tx_array_size : remain; |
| 166 | + dev_dbg(par->info->device, " to_copy=%zu, remain=%zu\n", |
| 167 | + to_copy, remain - to_copy); |
| 168 | + |
| 169 | + for (i = 0; i < to_copy; i++) |
| 170 | + txbuf16[i] = cpu_to_be16(vmem16[i]); |
| 171 | + |
| 172 | + vmem16 = vmem16 + to_copy; |
| 173 | + ret = par->fbtftops.write(par, par->txbuf.buf, |
| 174 | + startbyte_size + to_copy * 2); |
| 175 | + if (ret < 0) |
| 176 | + return ret; |
| 177 | + remain -= to_copy; |
| 178 | + } |
| 179 | + |
| 180 | + return ret; |
| 181 | +} |
| 182 | +EXPORT_SYMBOL(fbtft_write_vmem16_bus8); |
| 183 | + |
| 184 | +/* 16 bit pixel over 9-bit SPI bus: dc + high byte, dc + low byte */ |
| 185 | +int fbtft_write_vmem16_bus9(struct fbtft_par *par, size_t offset, size_t len) |
| 186 | +{ |
| 187 | + u8 *vmem8; |
| 188 | + u16 *txbuf16 = par->txbuf.buf; |
| 189 | + size_t remain; |
| 190 | + size_t to_copy; |
| 191 | + size_t tx_array_size; |
| 192 | + int i; |
| 193 | + int ret = 0; |
| 194 | + |
| 195 | + fbtft_par_dbg(DEBUG_WRITE_VMEM, par, "%s(offset=%zu, len=%zu)\n", |
| 196 | + __func__, offset, len); |
| 197 | + |
| 198 | + if (!par->txbuf.buf) { |
| 199 | + dev_err(par->info->device, "%s: txbuf.buf is NULL\n", __func__); |
| 200 | + return -1; |
| 201 | + } |
| 202 | + |
| 203 | + remain = len; |
| 204 | + vmem8 = par->info->screen_base + offset; |
| 205 | + |
| 206 | + tx_array_size = par->txbuf.len / 2; |
| 207 | + |
| 208 | + while (remain) { |
| 209 | + to_copy = remain > tx_array_size ? tx_array_size : remain; |
| 210 | + dev_dbg(par->info->device, " to_copy=%zu, remain=%zu\n", |
| 211 | + to_copy, remain - to_copy); |
| 212 | + |
| 213 | +#ifdef __LITTLE_ENDIAN |
| 214 | + for (i = 0; i < to_copy; i += 2) { |
| 215 | + txbuf16[i] = 0x0100 | vmem8[i+1]; |
| 216 | + txbuf16[i+1] = 0x0100 | vmem8[i]; |
| 217 | + } |
| 218 | +#else |
| 219 | + for (i = 0; i < to_copy; i++) |
| 220 | + txbuf16[i] = 0x0100 | vmem8[i]; |
| 221 | +#endif |
| 222 | + vmem8 = vmem8 + to_copy; |
| 223 | + ret = par->fbtftops.write(par, par->txbuf.buf, to_copy*2); |
| 224 | + if (ret < 0) |
| 225 | + return ret; |
| 226 | + remain -= to_copy; |
| 227 | + } |
| 228 | + |
| 229 | + return ret; |
| 230 | +} |
| 231 | +EXPORT_SYMBOL(fbtft_write_vmem16_bus9); |
| 232 | + |
| 233 | +int fbtft_write_vmem8_bus8(struct fbtft_par *par, size_t offset, size_t len) |
| 234 | +{ |
| 235 | + dev_err(par->info->device, "%s: function not implemented\n", __func__); |
| 236 | + return -1; |
| 237 | +} |
| 238 | +EXPORT_SYMBOL(fbtft_write_vmem8_bus8); |
| 239 | + |
| 240 | +/* 16 bit pixel over 16-bit databus */ |
| 241 | +int fbtft_write_vmem16_bus16(struct fbtft_par *par, size_t offset, size_t len) |
| 242 | +{ |
| 243 | + u16 *vmem16; |
| 244 | + |
| 245 | + fbtft_par_dbg(DEBUG_WRITE_VMEM, par, "%s(offset=%zu, len=%zu)\n", |
| 246 | + __func__, offset, len); |
| 247 | + |
| 248 | + vmem16 = (u16 *)(par->info->screen_base + offset); |
| 249 | + |
| 250 | + if (par->gpio.dc != -1) |
| 251 | + gpio_set_value(par->gpio.dc, 1); |
| 252 | + |
| 253 | + /* no need for buffered write with 16-bit bus */ |
| 254 | + return par->fbtftops.write(par, vmem16, len); |
| 255 | +} |
| 256 | +EXPORT_SYMBOL(fbtft_write_vmem16_bus16); |
0 commit comments