| #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_ssd1351" |
| #define WIDTH 128 |
| #define HEIGHT 128 |
| #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 void register_onboard_backlight(struct fbtft_par *par); |
| |
| static int init_display(struct fbtft_par *par) |
| { |
| if (par->pdata |
| && par->pdata->display.backlight == FBTFT_ONBOARD_BACKLIGHT) { |
| /* module uses onboard GPIO for panel power */ |
| par->fbtftops.register_backlight = register_onboard_backlight; |
| } |
| |
| par->fbtftops.reset(par); |
| |
| write_reg(par, 0xfd, 0x12); /* Command Lock */ |
| write_reg(par, 0xfd, 0xb1); /* Command Lock */ |
| write_reg(par, 0xae); /* Display Off */ |
| write_reg(par, 0xb3, 0xf1); /* Front Clock Div */ |
| write_reg(par, 0xca, 0x7f); /* Set Mux Ratio */ |
| write_reg(par, 0x15, 0x00, 0x7f); /* Set Column Address */ |
| write_reg(par, 0x75, 0x00, 0x7f); /* Set Row Address */ |
| write_reg(par, 0xa1, 0x00); /* Set Display Start Line */ |
| write_reg(par, 0xa2, 0x00); /* Set Display Offset */ |
| write_reg(par, 0xb5, 0x00); /* Set GPIO */ |
| write_reg(par, 0xab, 0x01); /* Set Function Selection */ |
| write_reg(par, 0xb1, 0x32); /* Set Phase Length */ |
| write_reg(par, 0xb4, 0xa0, 0xb5, 0x55); /* Set Segment Low Voltage */ |
| write_reg(par, 0xbb, 0x17); /* Set Precharge Voltage */ |
| write_reg(par, 0xbe, 0x05); /* Set VComH Voltage */ |
| write_reg(par, 0xc1, 0xc8, 0x80, 0xc8); /* Set Contrast */ |
| write_reg(par, 0xc7, 0x0f); /* Set Master Contrast */ |
| write_reg(par, 0xb6, 0x01); /* Set Second Precharge Period */ |
| write_reg(par, 0xa6); /* Set Display Mode Reset */ |
| 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); |
| write_reg(par, 0x5c); |
| } |
| |
| static int set_var(struct fbtft_par *par) |
| { |
| unsigned remap; |
| |
| if (par->fbtftops.init_display != init_display) { |
| /* don't risk messing up register A0h */ |
| fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, |
| "%s: skipping since custom init_display() is used\n", |
| __func__); |
| return 0; |
| } |
| |
| remap = 0x60 | (par->bgr << 2); /* Set Colour Depth */ |
| |
| switch (par->info->var.rotate) { |
| case 0: |
| write_reg(par, 0xA0, remap | 0x00 | 1<<4); |
| break; |
| case 270: |
| write_reg(par, 0xA0, remap | 0x03 | 1<<4); |
| break; |
| case 180: |
| write_reg(par, 0xA0, remap | 0x02); |
| break; |
| case 90: |
| write_reg(par, 0xA0, remap | 0x01); |
| break; |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * 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; |
| |
| 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 = { |
| .init_display = init_display, |
| .set_addr_win = set_addr_win, |
| .set_var = set_var, |
| .set_gamma = set_gamma, |
| .blank = blank, |
| }, |
| }; |
| |
| #ifdef CONFIG_FB_BACKLIGHT |
| static int update_onboard_backlight(struct backlight_device *bd) |
| { |
| struct fbtft_par *par = bl_get_data(bd); |
| bool on; |
| |
| fbtft_par_dbg(DEBUG_BACKLIGHT, par, |
| "%s: power=%d, fb_blank=%d\n", |
| __func__, bd->props.power, bd->props.fb_blank); |
| |
| on = (bd->props.power == FB_BLANK_UNBLANK) |
| && (bd->props.fb_blank == FB_BLANK_UNBLANK); |
| /* Onboard backlight connected to GPIO0 on SSD1351, GPIO1 unused */ |
| write_reg(par, 0xB5, on ? 0x03 : 0x02); |
| |
| return 0; |
| } |
| |
| static const struct backlight_ops bl_ops = { |
| .update_status = update_onboard_backlight, |
| }; |
| |
| static void register_onboard_backlight(struct fbtft_par *par) |
| { |
| struct backlight_device *bd; |
| struct backlight_properties bl_props = { 0, }; |
| |
| bl_props.type = BACKLIGHT_RAW; |
| bl_props.power = FB_BLANK_POWERDOWN; |
| |
| bd = backlight_device_register(dev_driver_string(par->info->device), |
| par->info->device, par, &bl_ops, &bl_props); |
| if (IS_ERR(bd)) { |
| dev_err(par->info->device, |
| "cannot register backlight device (%ld)\n", |
| PTR_ERR(bd)); |
| return; |
| } |
| par->info->bl_dev = bd; |
| |
| if (!par->fbtftops.unregister_backlight) |
| par->fbtftops.unregister_backlight = fbtft_unregister_backlight; |
| } |
| #else |
| static void register_onboard_backlight(struct fbtft_par *par) { }; |
| #endif |
| |
| FBTFT_REGISTER_DRIVER(DRVNAME, "solomon,ssd1351", &display); |
| |
| MODULE_ALIAS("spi:" DRVNAME); |
| MODULE_ALIAS("platform:" DRVNAME); |
| MODULE_ALIAS("spi:ssd1351"); |
| MODULE_ALIAS("platform:ssd1351"); |
| |
| MODULE_DESCRIPTION("SSD1351 OLED Driver"); |
| MODULE_AUTHOR("James Davies"); |
| MODULE_LICENSE("GPL"); |