diff options
Diffstat (limited to 'drivers/staging/fbtft/fb_ssd1331.c')
| -rw-r--r-- | drivers/staging/fbtft/fb_ssd1331.c | 205 |
1 files changed, 205 insertions, 0 deletions
diff --git a/drivers/staging/fbtft/fb_ssd1331.c b/drivers/staging/fbtft/fb_ssd1331.c new file mode 100644 index 000000000000..da7464f90e37 --- /dev/null +++ b/drivers/staging/fbtft/fb_ssd1331.c @@ -0,0 +1,205 @@ +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/gpio.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) +{ + fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__); + + par->fbtftops.reset(par); + + write_reg(par, 0xae); /* Display Off */ + write_reg(par, 0xa0, 0x70 | (par->bgr << 2)); /* Set Colour Depth */ + 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) +{ + fbtft_par_dbg(DEBUG_SET_ADDR_WIN, par, + "%s(xs=%d, ys=%d, xe=%d, ye=%d)\n", __func__, xs, ys, xe, 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 = (u8 *)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); + if (par->gpio.dc != -1) + gpio_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, "%s: write() failed and returned %d\n", __func__, 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, "%s: write() failed and returned %d\n", __func__, ret); + return; + } + } + if (par->gpio.dc != -1) + gpio_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, unsigned long *curves) +{ + unsigned long tmp[GAMMA_NUM * GAMMA_LEN]; + int i, acc = 0; + + fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__); + + 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(blank=%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"); |