Thomas Petazzoni | 883daf0 | 2014-12-31 10:11:28 +0100 | [diff] [blame] | 1 | #include <linux/module.h> |
| 2 | #include <linux/kernel.h> |
| 3 | #include <linux/init.h> |
| 4 | #include <linux/gpio.h> |
| 5 | #include <linux/spi/spi.h> |
| 6 | #include <linux/delay.h> |
| 7 | |
| 8 | #include "fbtft.h" |
| 9 | |
| 10 | #define DRVNAME "fb_ssd1351" |
| 11 | #define WIDTH 128 |
| 12 | #define HEIGHT 128 |
| 13 | #define GAMMA_NUM 1 |
| 14 | #define GAMMA_LEN 63 |
| 15 | #define DEFAULT_GAMMA "0 2 2 2 2 2 2 2 " \ |
| 16 | "2 2 2 2 2 2 2 2 " \ |
| 17 | "2 2 2 2 2 2 2 2 " \ |
| 18 | "2 2 2 2 2 2 2 2 " \ |
| 19 | "2 2 2 2 2 2 2 2 " \ |
| 20 | "2 2 2 2 2 2 2 2 " \ |
| 21 | "2 2 2 2 2 2 2 2 " \ |
| 22 | "2 2 2 2 2 2 2" \ |
| 23 | |
| 24 | static void register_onboard_backlight(struct fbtft_par *par); |
| 25 | |
| 26 | static int init_display(struct fbtft_par *par) |
| 27 | { |
Thomas Petazzoni | 883daf0 | 2014-12-31 10:11:28 +0100 | [diff] [blame] | 28 | if (par->pdata |
| 29 | && par->pdata->display.backlight == FBTFT_ONBOARD_BACKLIGHT) { |
| 30 | /* module uses onboard GPIO for panel power */ |
| 31 | par->fbtftops.register_backlight = register_onboard_backlight; |
| 32 | } |
| 33 | |
| 34 | par->fbtftops.reset(par); |
| 35 | |
| 36 | write_reg(par, 0xfd, 0x12); /* Command Lock */ |
| 37 | write_reg(par, 0xfd, 0xb1); /* Command Lock */ |
| 38 | write_reg(par, 0xae); /* Display Off */ |
| 39 | write_reg(par, 0xb3, 0xf1); /* Front Clock Div */ |
| 40 | write_reg(par, 0xca, 0x7f); /* Set Mux Ratio */ |
| 41 | write_reg(par, 0x15, 0x00, 0x7f); /* Set Column Address */ |
| 42 | write_reg(par, 0x75, 0x00, 0x7f); /* Set Row Address */ |
| 43 | write_reg(par, 0xa1, 0x00); /* Set Display Start Line */ |
| 44 | write_reg(par, 0xa2, 0x00); /* Set Display Offset */ |
| 45 | write_reg(par, 0xb5, 0x00); /* Set GPIO */ |
| 46 | write_reg(par, 0xab, 0x01); /* Set Function Selection */ |
| 47 | write_reg(par, 0xb1, 0x32); /* Set Phase Length */ |
| 48 | write_reg(par, 0xb4, 0xa0, 0xb5, 0x55); /* Set Segment Low Voltage */ |
| 49 | write_reg(par, 0xbb, 0x17); /* Set Precharge Voltage */ |
| 50 | write_reg(par, 0xbe, 0x05); /* Set VComH Voltage */ |
| 51 | write_reg(par, 0xc1, 0xc8, 0x80, 0xc8); /* Set Contrast */ |
| 52 | write_reg(par, 0xc7, 0x0f); /* Set Master Contrast */ |
| 53 | write_reg(par, 0xb6, 0x01); /* Set Second Precharge Period */ |
| 54 | write_reg(par, 0xa6); /* Set Display Mode Reset */ |
| 55 | write_reg(par, 0xaf); /* Set Sleep Mode Display On */ |
| 56 | |
| 57 | return 0; |
| 58 | } |
| 59 | |
| 60 | static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye) |
| 61 | { |
Thomas Petazzoni | 883daf0 | 2014-12-31 10:11:28 +0100 | [diff] [blame] | 62 | write_reg(par, 0x15, xs, xe); |
| 63 | write_reg(par, 0x75, ys, ye); |
| 64 | write_reg(par, 0x5c); |
| 65 | } |
| 66 | |
| 67 | static int set_var(struct fbtft_par *par) |
| 68 | { |
| 69 | unsigned remap; |
aybuke ozdemir | 54a8de1 | 2015-02-19 20:42:43 +0200 | [diff] [blame] | 70 | |
Thomas Petazzoni | 883daf0 | 2014-12-31 10:11:28 +0100 | [diff] [blame] | 71 | if (par->fbtftops.init_display != init_display) { |
| 72 | /* don't risk messing up register A0h */ |
| 73 | fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, |
| 74 | "%s: skipping since custom init_display() is used\n", |
| 75 | __func__); |
| 76 | return 0; |
| 77 | } |
| 78 | |
| 79 | remap = 0x60 | (par->bgr << 2); /* Set Colour Depth */ |
| 80 | |
| 81 | switch (par->info->var.rotate) { |
| 82 | case 0: |
Geert Uytterhoeven | 153fe94 | 2015-03-20 16:21:58 +0100 | [diff] [blame] | 83 | write_reg(par, 0xA0, remap | 0x00 | 1<<4); |
Thomas Petazzoni | 883daf0 | 2014-12-31 10:11:28 +0100 | [diff] [blame] | 84 | break; |
| 85 | case 270: |
Geert Uytterhoeven | 153fe94 | 2015-03-20 16:21:58 +0100 | [diff] [blame] | 86 | write_reg(par, 0xA0, remap | 0x03 | 1<<4); |
Thomas Petazzoni | 883daf0 | 2014-12-31 10:11:28 +0100 | [diff] [blame] | 87 | break; |
| 88 | case 180: |
Geert Uytterhoeven | 153fe94 | 2015-03-20 16:21:58 +0100 | [diff] [blame] | 89 | write_reg(par, 0xA0, remap | 0x02); |
Thomas Petazzoni | 883daf0 | 2014-12-31 10:11:28 +0100 | [diff] [blame] | 90 | break; |
| 91 | case 90: |
Geert Uytterhoeven | 153fe94 | 2015-03-20 16:21:58 +0100 | [diff] [blame] | 92 | write_reg(par, 0xA0, remap | 0x01); |
Thomas Petazzoni | 883daf0 | 2014-12-31 10:11:28 +0100 | [diff] [blame] | 93 | break; |
| 94 | } |
| 95 | |
| 96 | return 0; |
| 97 | } |
| 98 | |
| 99 | /* |
Cristina Moraru | ed400c9 | 2015-10-14 23:27:12 +0300 | [diff] [blame] | 100 | * Grayscale Lookup Table |
| 101 | * GS1 - GS63 |
| 102 | * The driver Gamma curve contains the relative values between the entries |
| 103 | * in the Lookup table. |
| 104 | * |
| 105 | * From datasheet: |
| 106 | * 8.8 Gray Scale Decoder |
| 107 | * |
| 108 | * there are total 180 Gamma Settings (Setting 0 to Setting 180) |
| 109 | * available for the Gray Scale table. |
| 110 | * |
| 111 | * The gray scale is defined in incremental way, with reference |
| 112 | * to the length of previous table entry: |
| 113 | * Setting of GS1 has to be >= 0 |
| 114 | * Setting of GS2 has to be > Setting of GS1 +1 |
| 115 | * Setting of GS3 has to be > Setting of GS2 +1 |
| 116 | * : |
| 117 | * Setting of GS63 has to be > Setting of GS62 +1 |
| 118 | * |
| 119 | */ |
Thomas Petazzoni | 883daf0 | 2014-12-31 10:11:28 +0100 | [diff] [blame] | 120 | static int set_gamma(struct fbtft_par *par, unsigned long *curves) |
| 121 | { |
| 122 | unsigned long tmp[GAMMA_NUM * GAMMA_LEN]; |
| 123 | int i, acc = 0; |
| 124 | |
Thomas Petazzoni | 883daf0 | 2014-12-31 10:11:28 +0100 | [diff] [blame] | 125 | for (i = 0; i < 63; i++) { |
| 126 | if (i > 0 && curves[i] < 2) { |
| 127 | dev_err(par->info->device, |
| 128 | "Illegal value in Grayscale Lookup Table at index %d. " \ |
| 129 | "Must be greater than 1\n", i); |
| 130 | return -EINVAL; |
| 131 | } |
| 132 | acc += curves[i]; |
| 133 | tmp[i] = acc; |
| 134 | if (acc > 180) { |
| 135 | dev_err(par->info->device, |
| 136 | "Illegal value(s) in Grayscale Lookup Table. " \ |
| 137 | "At index=%d, the accumulated value has exceeded 180\n", i); |
| 138 | return -EINVAL; |
| 139 | } |
| 140 | } |
| 141 | |
| 142 | write_reg(par, 0xB8, |
| 143 | tmp[0], tmp[1], tmp[2], tmp[3], tmp[4], tmp[5], tmp[6], tmp[7], |
| 144 | tmp[8], tmp[9], tmp[10], tmp[11], tmp[12], tmp[13], tmp[14], tmp[15], |
| 145 | tmp[16], tmp[17], tmp[18], tmp[19], tmp[20], tmp[21], tmp[22], tmp[23], |
| 146 | tmp[24], tmp[25], tmp[26], tmp[27], tmp[28], tmp[29], tmp[30], tmp[31], |
| 147 | tmp[32], tmp[33], tmp[34], tmp[35], tmp[36], tmp[37], tmp[38], tmp[39], |
| 148 | tmp[40], tmp[41], tmp[42], tmp[43], tmp[44], tmp[45], tmp[46], tmp[47], |
| 149 | tmp[48], tmp[49], tmp[50], tmp[51], tmp[52], tmp[53], tmp[54], tmp[55], |
| 150 | tmp[56], tmp[57], tmp[58], tmp[59], tmp[60], tmp[61], tmp[62]); |
| 151 | |
| 152 | return 0; |
| 153 | } |
| 154 | |
| 155 | static int blank(struct fbtft_par *par, bool on) |
| 156 | { |
| 157 | fbtft_par_dbg(DEBUG_BLANK, par, "%s(blank=%s)\n", |
| 158 | __func__, on ? "true" : "false"); |
| 159 | if (on) |
| 160 | write_reg(par, 0xAE); |
| 161 | else |
| 162 | write_reg(par, 0xAF); |
| 163 | return 0; |
| 164 | } |
| 165 | |
Thomas Petazzoni | 883daf0 | 2014-12-31 10:11:28 +0100 | [diff] [blame] | 166 | static struct fbtft_display display = { |
| 167 | .regwidth = 8, |
| 168 | .width = WIDTH, |
| 169 | .height = HEIGHT, |
| 170 | .gamma_num = GAMMA_NUM, |
| 171 | .gamma_len = GAMMA_LEN, |
| 172 | .gamma = DEFAULT_GAMMA, |
| 173 | .fbtftops = { |
| 174 | .init_display = init_display, |
| 175 | .set_addr_win = set_addr_win, |
| 176 | .set_var = set_var, |
| 177 | .set_gamma = set_gamma, |
| 178 | .blank = blank, |
| 179 | }, |
| 180 | }; |
| 181 | |
| 182 | #ifdef CONFIG_FB_BACKLIGHT |
| 183 | static int update_onboard_backlight(struct backlight_device *bd) |
| 184 | { |
| 185 | struct fbtft_par *par = bl_get_data(bd); |
| 186 | bool on; |
| 187 | |
| 188 | fbtft_par_dbg(DEBUG_BACKLIGHT, par, |
| 189 | "%s: power=%d, fb_blank=%d\n", |
| 190 | __func__, bd->props.power, bd->props.fb_blank); |
| 191 | |
| 192 | on = (bd->props.power == FB_BLANK_UNBLANK) |
| 193 | && (bd->props.fb_blank == FB_BLANK_UNBLANK); |
| 194 | /* Onboard backlight connected to GPIO0 on SSD1351, GPIO1 unused */ |
| 195 | write_reg(par, 0xB5, on ? 0x03 : 0x02); |
| 196 | |
| 197 | return 0; |
| 198 | } |
| 199 | |
Mike Rapoport | 23801e3 | 2015-09-03 08:13:13 +0300 | [diff] [blame] | 200 | static const struct backlight_ops bl_ops = { |
| 201 | .update_status = update_onboard_backlight, |
| 202 | }; |
| 203 | |
Thomas Petazzoni | 883daf0 | 2014-12-31 10:11:28 +0100 | [diff] [blame] | 204 | static void register_onboard_backlight(struct fbtft_par *par) |
| 205 | { |
| 206 | struct backlight_device *bd; |
| 207 | struct backlight_properties bl_props = { 0, }; |
Thomas Petazzoni | 883daf0 | 2014-12-31 10:11:28 +0100 | [diff] [blame] | 208 | |
Thomas Petazzoni | 883daf0 | 2014-12-31 10:11:28 +0100 | [diff] [blame] | 209 | bl_props.type = BACKLIGHT_RAW; |
| 210 | bl_props.power = FB_BLANK_POWERDOWN; |
| 211 | |
| 212 | bd = backlight_device_register(dev_driver_string(par->info->device), |
Mike Rapoport | 23801e3 | 2015-09-03 08:13:13 +0300 | [diff] [blame] | 213 | par->info->device, par, &bl_ops, &bl_props); |
Thomas Petazzoni | 883daf0 | 2014-12-31 10:11:28 +0100 | [diff] [blame] | 214 | if (IS_ERR(bd)) { |
| 215 | dev_err(par->info->device, |
| 216 | "cannot register backlight device (%ld)\n", |
| 217 | PTR_ERR(bd)); |
| 218 | return; |
| 219 | } |
| 220 | par->info->bl_dev = bd; |
| 221 | |
| 222 | if (!par->fbtftops.unregister_backlight) |
| 223 | par->fbtftops.unregister_backlight = fbtft_unregister_backlight; |
| 224 | } |
| 225 | #else |
| 226 | static void register_onboard_backlight(struct fbtft_par *par) { }; |
| 227 | #endif |
| 228 | |
Thomas Petazzoni | 883daf0 | 2014-12-31 10:11:28 +0100 | [diff] [blame] | 229 | FBTFT_REGISTER_DRIVER(DRVNAME, "solomon,ssd1351", &display); |
| 230 | |
| 231 | MODULE_ALIAS("spi:" DRVNAME); |
| 232 | MODULE_ALIAS("platform:" DRVNAME); |
| 233 | MODULE_ALIAS("spi:ssd1351"); |
| 234 | MODULE_ALIAS("platform:ssd1351"); |
| 235 | |
| 236 | MODULE_DESCRIPTION("SSD1351 OLED Driver"); |
| 237 | MODULE_AUTHOR("James Davies"); |
| 238 | MODULE_LICENSE("GPL"); |