diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
---|---|---|
committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/staging/fbtft/fb_ssd1351.c | |
parent | Initial commit. (diff) | |
download | linux-upstream.tar.xz linux-upstream.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/staging/fbtft/fb_ssd1351.c')
-rw-r--r-- | drivers/staging/fbtft/fb_ssd1351.c | 242 |
1 files changed, 242 insertions, 0 deletions
diff --git a/drivers/staging/fbtft/fb_ssd1351.c b/drivers/staging/fbtft/fb_ssd1351.c new file mode 100644 index 000000000..b8d55aa8c --- /dev/null +++ b/drivers/staging/fbtft/fb_ssd1351.c @@ -0,0 +1,242 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/init.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 int 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 | BIT(4)); + break; + case 270: + write_reg(par, 0xA0, remap | 0x03 | BIT(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, 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 : %d. Must be greater than 1\n", + i, curves[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 : %d, the accumulated value has exceeded 180\n", + i, acc); + 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 = { + .init_display = init_display, + .set_addr_win = set_addr_win, + .set_var = set_var, + .set_gamma = set_gamma, + .blank = blank, + }, +}; + +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 = !backlight_is_blank(bd); + /* 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; +} + +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"); |