diff options
Diffstat (limited to 'drivers/staging/fbtft/fb_ssd1331.c')
| -rw-r--r-- | drivers/staging/fbtft/fb_ssd1331.c | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/drivers/staging/fbtft/fb_ssd1331.c b/drivers/staging/fbtft/fb_ssd1331.c new file mode 100644 index 000000000..ec5eced7f --- /dev/null +++ b/drivers/staging/fbtft/fb_ssd1331.c @@ -0,0 +1,204 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/gpio/consumer.h> +#include <linux/spi/spi.h> +#include <linux/delay.h> + +#include "fbtft.h" + +#define DRVNAME "fb_ssd1331" +#define WIDTH 96 +#define HEIGHT 64 +#define GAMMA_NUM 1 +#define GAMMA_LEN 63 +#define DEFAULT_GAMMA "0 2 2 2 2 2 2 2 " \ + "2 2 2 2 2 2 2 2 " \ + "2 2 2 2 2 2 2 2 " \ + "2 2 2 2 2 2 2 2 " \ + "2 2 2 2 2 2 2 2 " \ + "2 2 2 2 2 2 2 2 " \ + "2 2 2 2 2 2 2 2 " \ + "2 2 2 2 2 2 2" \ + +static int init_display(struct fbtft_par *par) +{ + par->fbtftops.reset(par); + + write_reg(par, 0xae); /* Display Off */ + + /* Set Column Address Mapping, COM Scan Direction and Colour Depth */ + if (par->info->var.rotate == 180) + write_reg(par, 0xa0, 0x60 | (par->bgr << 2)); + else + write_reg(par, 0xa0, 0x72 | (par->bgr << 2)); + + write_reg(par, 0x72); /* RGB colour */ + write_reg(par, 0xa1, 0x00); /* Set Display Start Line */ + write_reg(par, 0xa2, 0x00); /* Set Display Offset */ + write_reg(par, 0xa4); /* NORMALDISPLAY */ + write_reg(par, 0xa8, 0x3f); /* Set multiplex */ + write_reg(par, 0xad, 0x8e); /* Set master */ + /* write_reg(par, 0xb0, 0x0b); Set power mode */ + write_reg(par, 0xb1, 0x31); /* Precharge */ + write_reg(par, 0xb3, 0xf0); /* Clock div */ + write_reg(par, 0x8a, 0x64); /* Precharge A */ + write_reg(par, 0x8b, 0x78); /* Precharge B */ + write_reg(par, 0x8c, 0x64); /* Precharge C */ + write_reg(par, 0xbb, 0x3a); /* Precharge level */ + write_reg(par, 0xbe, 0x3e); /* vcomh */ + write_reg(par, 0x87, 0x06); /* Master current */ + write_reg(par, 0x81, 0x91); /* Contrast A */ + write_reg(par, 0x82, 0x50); /* Contrast B */ + write_reg(par, 0x83, 0x7d); /* Contrast C */ + write_reg(par, 0xaf); /* Set Sleep Mode Display On */ + + return 0; +} + +static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye) +{ + write_reg(par, 0x15, xs, xe); + write_reg(par, 0x75, ys, ye); +} + +static void write_reg8_bus8(struct fbtft_par *par, int len, ...) +{ + va_list args; + int i, ret; + u8 *buf = par->buf; + + if (unlikely(par->debug & DEBUG_WRITE_REGISTER)) { + va_start(args, len); + for (i = 0; i < len; i++) + 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__); + } + + va_start(args, len); + + *buf = (u8)va_arg(args, unsigned int); + gpiod_set_value(par->gpio.dc, 0); + ret = par->fbtftops.write(par, par->buf, sizeof(u8)); + if (ret < 0) { + va_end(args); + dev_err(par->info->device, + "write() failed and returned %d\n", ret); + return; + } + len--; + + if (len) { + i = len; + while (i--) + *buf++ = (u8)va_arg(args, unsigned int); + ret = par->fbtftops.write(par, par->buf, len * (sizeof(u8))); + if (ret < 0) { + va_end(args); + dev_err(par->info->device, + "write() failed and returned %d\n", ret); + return; + } + } + gpiod_set_value(par->gpio.dc, 1); + va_end(args); +} + +/* + * Grayscale Lookup Table + * GS1 - GS63 + * The driver Gamma curve contains the relative values between the entries + * in the Lookup table. + * + * From datasheet: + * 8.8 Gray Scale Decoder + * + * there are total 180 Gamma Settings (Setting 0 to Setting 180) + * available for the Gray Scale table. + * + * The gray scale is defined in incremental way, with reference + * to the length of previous table entry: + * Setting of GS1 has to be >= 0 + * Setting of GS2 has to be > Setting of GS1 +1 + * Setting of GS3 has to be > Setting of GS2 +1 + * : + * Setting of GS63 has to be > Setting of GS62 +1 + * + */ +static int set_gamma(struct fbtft_par *par, u32 *curves) +{ + unsigned long tmp[GAMMA_NUM * GAMMA_LEN]; + int i, acc = 0; + + for (i = 0; i < 63; i++) { + if (i > 0 && curves[i] < 2) { + dev_err(par->info->device, + "Illegal value in Grayscale Lookup Table at index %d. Must be greater than 1\n", + i); + return -EINVAL; + } + acc += curves[i]; + tmp[i] = acc; + if (acc > 180) { + dev_err(par->info->device, + "Illegal value(s) in Grayscale Lookup Table. At index=%d, the accumulated value has exceeded 180\n", + i); + return -EINVAL; + } + } + + write_reg(par, 0xB8, + tmp[0], tmp[1], tmp[2], tmp[3], tmp[4], tmp[5], tmp[6], + tmp[7], tmp[8], tmp[9], tmp[10], tmp[11], tmp[12], tmp[13], + tmp[14], tmp[15], tmp[16], tmp[17], tmp[18], tmp[19], tmp[20], + tmp[21], tmp[22], tmp[23], tmp[24], tmp[25], tmp[26], tmp[27], + tmp[28], tmp[29], tmp[30], tmp[31], tmp[32], tmp[33], tmp[34], + tmp[35], tmp[36], tmp[37], tmp[38], tmp[39], tmp[40], tmp[41], + tmp[42], tmp[43], tmp[44], tmp[45], tmp[46], tmp[47], tmp[48], + tmp[49], tmp[50], tmp[51], tmp[52], tmp[53], tmp[54], tmp[55], + tmp[56], tmp[57], tmp[58], tmp[59], tmp[60], tmp[61], + tmp[62]); + + return 0; +} + +static int blank(struct fbtft_par *par, bool on) +{ + fbtft_par_dbg(DEBUG_BLANK, par, "(%s=%s)\n", + __func__, on ? "true" : "false"); + if (on) + write_reg(par, 0xAE); + else + write_reg(par, 0xAF); + return 0; +} + +static struct fbtft_display display = { + .regwidth = 8, + .width = WIDTH, + .height = HEIGHT, + .gamma_num = GAMMA_NUM, + .gamma_len = GAMMA_LEN, + .gamma = DEFAULT_GAMMA, + .fbtftops = { + .write_register = write_reg8_bus8, + .init_display = init_display, + .set_addr_win = set_addr_win, + .set_gamma = set_gamma, + .blank = blank, + }, +}; + +FBTFT_REGISTER_DRIVER(DRVNAME, "solomon,ssd1331", &display); + +MODULE_ALIAS("spi:" DRVNAME); +MODULE_ALIAS("platform:" DRVNAME); +MODULE_ALIAS("spi:ssd1331"); +MODULE_ALIAS("platform:ssd1331"); + +MODULE_DESCRIPTION("SSD1331 OLED Driver"); +MODULE_AUTHOR("Alec Smecher (adapted from SSD1351 by James Davies)"); +MODULE_LICENSE("GPL"); |