Thomas Petazzoni | 39e3d67 | 2014-12-31 10:11:12 +0100 | [diff] [blame] | 1 | /* |
| 2 | * FB driver for the HX8340BN LCD Controller |
| 3 | * |
| 4 | * This display uses 9-bit SPI: Data/Command bit + 8 data bits |
| 5 | * For platforms that doesn't support 9-bit, the driver is capable |
| 6 | * of emulating this using 8-bit transfer. |
| 7 | * This is done by transfering eight 9-bit words in 9 bytes. |
| 8 | * |
| 9 | * Copyright (C) 2013 Noralf Tronnes |
| 10 | * |
| 11 | * This program is free software; you can redistribute it and/or modify |
| 12 | * it under the terms of the GNU General Public License as published by |
| 13 | * the Free Software Foundation; either version 2 of the License, or |
| 14 | * (at your option) any later version. |
| 15 | * |
| 16 | * This program is distributed in the hope that it will be useful, |
| 17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 19 | * GNU General Public License for more details. |
| 20 | * |
| 21 | * You should have received a copy of the GNU General Public License |
| 22 | * along with this program; if not, write to the Free Software |
| 23 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 24 | */ |
| 25 | |
| 26 | #include <linux/module.h> |
| 27 | #include <linux/kernel.h> |
| 28 | #include <linux/init.h> |
| 29 | #include <linux/vmalloc.h> |
| 30 | #include <linux/spi/spi.h> |
| 31 | #include <linux/delay.h> |
| 32 | |
| 33 | #include "fbtft.h" |
| 34 | |
| 35 | #define DRVNAME "fb_hx8340bn" |
| 36 | #define WIDTH 176 |
| 37 | #define HEIGHT 220 |
| 38 | #define TXBUFLEN (4 * PAGE_SIZE) |
| 39 | #define DEFAULT_GAMMA "1 3 0E 5 0 2 09 0 6 1 7 1 0 2 2\n" \ |
| 40 | "3 3 17 8 4 7 05 7 6 0 3 1 6 0 0 " |
| 41 | |
| 42 | |
| 43 | static bool emulate; |
| 44 | module_param(emulate, bool, 0); |
| 45 | MODULE_PARM_DESC(emulate, "Force emulation in 9-bit mode"); |
| 46 | |
| 47 | |
| 48 | static int init_display(struct fbtft_par *par) |
| 49 | { |
Thomas Petazzoni | 39e3d67 | 2014-12-31 10:11:12 +0100 | [diff] [blame] | 50 | par->fbtftops.reset(par); |
| 51 | |
| 52 | /* BTL221722-276L startup sequence, from datasheet */ |
| 53 | |
| 54 | /* SETEXTCOM: Set extended command set (C1h) |
| 55 | This command is used to set extended command set access enable. |
| 56 | Enable: After command (C1h), must write: ffh,83h,40h */ |
| 57 | write_reg(par, 0xC1, 0xFF, 0x83, 0x40); |
| 58 | |
| 59 | /* Sleep out |
| 60 | This command turns off sleep mode. |
| 61 | In this mode the DC/DC converter is enabled, Internal oscillator |
| 62 | is started, and panel scanning is started. */ |
| 63 | write_reg(par, 0x11); |
| 64 | mdelay(150); |
| 65 | |
| 66 | /* Undoc'd register? */ |
| 67 | write_reg(par, 0xCA, 0x70, 0x00, 0xD9); |
| 68 | |
| 69 | /* SETOSC: Set Internal Oscillator (B0h) |
| 70 | This command is used to set internal oscillator related settings */ |
| 71 | /* OSC_EN: Enable internal oscillator */ |
| 72 | /* Internal oscillator frequency: 125% x 2.52MHz */ |
| 73 | write_reg(par, 0xB0, 0x01, 0x11); |
| 74 | |
| 75 | /* Drive ability setting */ |
| 76 | write_reg(par, 0xC9, 0x90, 0x49, 0x10, 0x28, 0x28, 0x10, 0x00, 0x06); |
| 77 | mdelay(20); |
| 78 | |
| 79 | /* SETPWCTR5: Set Power Control 5(B5h) |
| 80 | This command is used to set VCOM Low and VCOM High Voltage */ |
| 81 | /* VCOMH 0110101 : 3.925 */ |
| 82 | /* VCOML 0100000 : -1.700 */ |
| 83 | /* 45h=69 VCOMH: "VMH" + 5d VCOML: "VMH" + 5d */ |
| 84 | write_reg(par, 0xB5, 0x35, 0x20, 0x45); |
| 85 | |
| 86 | /* SETPWCTR4: Set Power Control 4(B4h) |
| 87 | VRH[4:0]: Specify the VREG1 voltage adjusting. |
| 88 | VREG1 voltage is for gamma voltage setting. |
| 89 | BT[2:0]: Switch the output factor of step-up circuit 2 |
| 90 | for VGH and VGL voltage generation. */ |
| 91 | write_reg(par, 0xB4, 0x33, 0x25, 0x4C); |
| 92 | mdelay(10); |
| 93 | |
| 94 | /* Interface Pixel Format (3Ah) |
| 95 | This command is used to define the format of RGB picture data, |
| 96 | which is to be transfer via the system and RGB interface. */ |
| 97 | /* RGB interface: 16 Bit/Pixel */ |
| 98 | write_reg(par, 0x3A, 0x05); |
| 99 | |
| 100 | /* Display on (29h) |
| 101 | This command is used to recover from DISPLAY OFF mode. |
| 102 | Output from the Frame Memory is enabled. */ |
| 103 | write_reg(par, 0x29); |
| 104 | mdelay(10); |
| 105 | |
| 106 | return 0; |
| 107 | } |
| 108 | |
Frederic Jacob | cc060ed | 2015-02-07 21:15:25 -0500 | [diff] [blame] | 109 | static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye) |
Thomas Petazzoni | 39e3d67 | 2014-12-31 10:11:12 +0100 | [diff] [blame] | 110 | { |
Thomas Petazzoni | 39e3d67 | 2014-12-31 10:11:12 +0100 | [diff] [blame] | 111 | write_reg(par, FBTFT_CASET, 0x00, xs, 0x00, xe); |
| 112 | write_reg(par, FBTFT_RASET, 0x00, ys, 0x00, ye); |
| 113 | write_reg(par, FBTFT_RAMWR); |
| 114 | } |
| 115 | |
| 116 | static int set_var(struct fbtft_par *par) |
| 117 | { |
Thomas Petazzoni | 39e3d67 | 2014-12-31 10:11:12 +0100 | [diff] [blame] | 118 | /* MADCTL - Memory data access control */ |
| 119 | /* RGB/BGR can be set with H/W pin SRGB and MADCTL BGR bit */ |
| 120 | #define MY (1 << 7) |
| 121 | #define MX (1 << 6) |
| 122 | #define MV (1 << 5) |
| 123 | switch (par->info->var.rotate) { |
| 124 | case 0: |
Aya Mahfouz | 721bc82 | 2015-03-10 19:05:27 +0200 | [diff] [blame] | 125 | write_reg(par, 0x36, par->bgr << 3); |
Thomas Petazzoni | 39e3d67 | 2014-12-31 10:11:12 +0100 | [diff] [blame] | 126 | break; |
| 127 | case 270: |
| 128 | write_reg(par, 0x36, MX | MV | (par->bgr << 3)); |
| 129 | break; |
| 130 | case 180: |
| 131 | write_reg(par, 0x36, MX | MY | (par->bgr << 3)); |
| 132 | break; |
| 133 | case 90: |
| 134 | write_reg(par, 0x36, MY | MV | (par->bgr << 3)); |
| 135 | break; |
| 136 | } |
| 137 | |
| 138 | return 0; |
| 139 | } |
| 140 | |
| 141 | /* |
| 142 | Gamma Curve selection, GC (only GC0 can be customized): |
| 143 | 0 = 2.2, 1 = 1.8, 2 = 2.5, 3 = 1.0 |
| 144 | Gamma string format: |
| 145 | OP0 OP1 CP0 CP1 CP2 CP3 CP4 MP0 MP1 MP2 MP3 MP4 MP5 CGM0 CGM1 |
| 146 | ON0 ON1 CN0 CN1 CN2 CN3 CN4 MN0 MN1 MN2 MN3 MN4 MN5 XXXX GC |
| 147 | */ |
| 148 | #define CURVE(num, idx) curves[num*par->gamma.num_values + idx] |
| 149 | static int set_gamma(struct fbtft_par *par, unsigned long *curves) |
| 150 | { |
| 151 | unsigned long mask[] = { |
Geert Uytterhoeven | 153fe94 | 2015-03-20 16:21:58 +0100 | [diff] [blame] | 152 | 0x0f, 0x0f, 0x1f, 0x0f, 0x0f, 0x0f, 0x1f, 0x07, 0x07, 0x07, |
| 153 | 0x07, 0x07, 0x07, 0x03, 0x03, 0x0f, 0x0f, 0x1f, 0x0f, 0x0f, |
| 154 | 0x0f, 0x1f, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x00, 0x00, |
| 155 | }; |
Thomas Petazzoni | 39e3d67 | 2014-12-31 10:11:12 +0100 | [diff] [blame] | 156 | int i, j; |
| 157 | |
Thomas Petazzoni | 39e3d67 | 2014-12-31 10:11:12 +0100 | [diff] [blame] | 158 | /* apply mask */ |
| 159 | for (i = 0; i < par->gamma.num_curves; i++) |
| 160 | for (j = 0; j < par->gamma.num_values; j++) |
| 161 | CURVE(i, j) &= mask[i * par->gamma.num_values + j]; |
| 162 | |
| 163 | write_reg(par, 0x26, 1 << CURVE(1, 14)); /* Gamma Set (26h) */ |
| 164 | |
| 165 | if (CURVE(1, 14)) |
| 166 | return 0; /* only GC0 can be customized */ |
| 167 | |
| 168 | write_reg(par, 0xC2, |
| 169 | (CURVE(0, 8) << 4) | CURVE(0, 7), |
| 170 | (CURVE(0, 10) << 4) | CURVE(0, 9), |
| 171 | (CURVE(0, 12) << 4) | CURVE(0, 11), |
| 172 | CURVE(0, 2), |
| 173 | (CURVE(0, 4) << 4) | CURVE(0, 3), |
| 174 | CURVE(0, 5), |
| 175 | CURVE(0, 6), |
| 176 | (CURVE(0, 1) << 4) | CURVE(0, 0), |
| 177 | (CURVE(0, 14) << 2) | CURVE(0, 13)); |
| 178 | |
| 179 | write_reg(par, 0xC3, |
| 180 | (CURVE(1, 8) << 4) | CURVE(1, 7), |
| 181 | (CURVE(1, 10) << 4) | CURVE(1, 9), |
| 182 | (CURVE(1, 12) << 4) | CURVE(1, 11), |
| 183 | CURVE(1, 2), |
| 184 | (CURVE(1, 4) << 4) | CURVE(1, 3), |
| 185 | CURVE(1, 5), |
| 186 | CURVE(1, 6), |
| 187 | (CURVE(1, 1) << 4) | CURVE(1, 0)); |
| 188 | |
| 189 | mdelay(10); |
| 190 | |
| 191 | return 0; |
| 192 | } |
| 193 | #undef CURVE |
| 194 | |
| 195 | |
| 196 | static struct fbtft_display display = { |
| 197 | .regwidth = 8, |
| 198 | .width = WIDTH, |
| 199 | .height = HEIGHT, |
| 200 | .txbuflen = TXBUFLEN, |
| 201 | .gamma_num = 2, |
| 202 | .gamma_len = 15, |
| 203 | .gamma = DEFAULT_GAMMA, |
| 204 | .fbtftops = { |
| 205 | .init_display = init_display, |
| 206 | .set_addr_win = set_addr_win, |
| 207 | .set_var = set_var, |
| 208 | .set_gamma = set_gamma, |
| 209 | }, |
| 210 | }; |
| 211 | FBTFT_REGISTER_DRIVER(DRVNAME, "himax,hx8340bn", &display); |
| 212 | |
| 213 | MODULE_ALIAS("spi:" DRVNAME); |
| 214 | MODULE_ALIAS("platform:" DRVNAME); |
| 215 | MODULE_ALIAS("spi:hx8340bn"); |
| 216 | MODULE_ALIAS("platform:hx8340bn"); |
| 217 | |
| 218 | MODULE_DESCRIPTION("FB driver for the HX8340BN LCD Controller"); |
| 219 | MODULE_AUTHOR("Noralf Tronnes"); |
| 220 | MODULE_LICENSE("GPL"); |