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fb_hx8340bn.c
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fb_hx8340bn.c
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/*
* FB driver for the HX8340BN LCD Controller
*
* This display uses 9-bit SPI: Data/Command bit + 8 data bits
* For platforms that doesn't support 9-bit, the driver is capable
* of emulating this using 8-bit transfer.
* This is done by transfering eight 9-bit words in 9 bytes.
*
* Copyright (C) 2013 Noralf Tronnes
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/vmalloc.h>
#include <linux/spi/spi.h>
#include <linux/delay.h>
#include "fbtft.h"
#define DRVNAME "fb_hx8340bn"
#define WIDTH 176
#define HEIGHT 220
#define TXBUFLEN (4 * PAGE_SIZE)
#define DEFAULT_GAMMA "1 3 0E 5 0 2 09 0 6 1 7 1 0 2 2\n" \
"3 3 17 8 4 7 05 7 6 0 3 1 6 0 0 "
static bool emulate;
module_param(emulate, bool, 0);
MODULE_PARM_DESC(emulate, "Force emulation in 9-bit mode");
static int init_display(struct fbtft_par *par)
{
fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__);
par->fbtftops.reset(par);
/* BTL221722-276L startup sequence, from datasheet */
/* SETEXTCOM: Set extended command set (C1h)
This command is used to set extended command set access enable.
Enable: After command (C1h), must write: ffh,83h,40h */
write_reg(par, 0xC1, 0xFF, 0x83, 0x40);
/* Sleep out
This command turns off sleep mode.
In this mode the DC/DC converter is enabled, Internal oscillator
is started, and panel scanning is started. */
write_reg(par, 0x11);
mdelay(150);
/* Undoc'd register? */
write_reg(par, 0xCA, 0x70, 0x00, 0xD9);
/* SETOSC: Set Internal Oscillator (B0h)
This command is used to set internal oscillator related settings */
/* OSC_EN: Enable internal oscillator */
/* Internal oscillator frequency: 125% x 2.52MHz */
write_reg(par, 0xB0, 0x01, 0x11);
/* Drive ability setting */
write_reg(par, 0xC9, 0x90, 0x49, 0x10, 0x28, 0x28, 0x10, 0x00, 0x06);
mdelay(20);
/* SETPWCTR5: Set Power Control 5(B5h)
This command is used to set VCOM Low and VCOM High Voltage */
/* VCOMH 0110101 : 3.925 */
/* VCOML 0100000 : -1.700 */
/* 45h=69 VCOMH: "VMH" + 5d VCOML: "VMH" + 5d */
write_reg(par, 0xB5, 0x35, 0x20, 0x45);
/* SETPWCTR4: Set Power Control 4(B4h)
VRH[4:0]: Specify the VREG1 voltage adjusting.
VREG1 voltage is for gamma voltage setting.
BT[2:0]: Switch the output factor of step-up circuit 2
for VGH and VGL voltage generation. */
write_reg(par, 0xB4, 0x33, 0x25, 0x4C);
mdelay(10);
/* Interface Pixel Format (3Ah)
This command is used to define the format of RGB picture data,
which is to be transfer via the system and RGB interface. */
/* RGB interface: 16 Bit/Pixel */
write_reg(par, 0x3A, 0x05);
/* Display on (29h)
This command is used to recover from DISPLAY OFF mode.
Output from the Frame Memory is enabled. */
write_reg(par, 0x29);
mdelay(10);
return 0;
}
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, FBTFT_CASET, 0x00, xs, 0x00, xe);
write_reg(par, FBTFT_RASET, 0x00, ys, 0x00, ye);
write_reg(par, FBTFT_RAMWR);
}
static int set_var(struct fbtft_par *par)
{
fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__);
/* MADCTL - Memory data access control */
/* RGB/BGR can be set with H/W pin SRGB and MADCTL BGR bit */
#define MY (1 << 7)
#define MX (1 << 6)
#define MV (1 << 5)
switch (par->info->var.rotate) {
case 0:
write_reg(par, 0x36, (par->bgr << 3));
break;
case 270:
write_reg(par, 0x36, MX | MV | (par->bgr << 3));
break;
case 180:
write_reg(par, 0x36, MX | MY | (par->bgr << 3));
break;
case 90:
write_reg(par, 0x36, MY | MV | (par->bgr << 3));
break;
}
return 0;
}
/*
Gamma Curve selection, GC (only GC0 can be customized):
0 = 2.2, 1 = 1.8, 2 = 2.5, 3 = 1.0
Gamma string format:
OP0 OP1 CP0 CP1 CP2 CP3 CP4 MP0 MP1 MP2 MP3 MP4 MP5 CGM0 CGM1
ON0 ON1 CN0 CN1 CN2 CN3 CN4 MN0 MN1 MN2 MN3 MN4 MN5 XXXX GC
*/
#define CURVE(num, idx) curves[num*par->gamma.num_values + idx]
static int set_gamma(struct fbtft_par *par, unsigned long *curves)
{
unsigned long mask[] = {
0b1111, 0b1111, 0b11111, 0b1111, 0b1111, 0b1111, 0b11111,
0b111, 0b111, 0b111, 0b111, 0b111, 0b111, 0b11, 0b11,
0b1111, 0b1111, 0b11111, 0b1111, 0b1111, 0b1111, 0b11111,
0b111, 0b111, 0b111, 0b111, 0b111, 0b111, 0b0, 0b0 };
int i, j;
fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__);
/* apply mask */
for (i = 0; i < par->gamma.num_curves; i++)
for (j = 0; j < par->gamma.num_values; j++)
CURVE(i, j) &= mask[i * par->gamma.num_values + j];
write_reg(par, 0x26, 1 << CURVE(1, 14)); /* Gamma Set (26h) */
if (CURVE(1, 14))
return 0; /* only GC0 can be customized */
write_reg(par, 0xC2,
(CURVE(0, 8) << 4) | CURVE(0, 7),
(CURVE(0, 10) << 4) | CURVE(0, 9),
(CURVE(0, 12) << 4) | CURVE(0, 11),
CURVE(0, 2),
(CURVE(0, 4) << 4) | CURVE(0, 3),
CURVE(0, 5),
CURVE(0, 6),
(CURVE(0, 1) << 4) | CURVE(0, 0),
(CURVE(0, 14) << 2) | CURVE(0, 13));
write_reg(par, 0xC3,
(CURVE(1, 8) << 4) | CURVE(1, 7),
(CURVE(1, 10) << 4) | CURVE(1, 9),
(CURVE(1, 12) << 4) | CURVE(1, 11),
CURVE(1, 2),
(CURVE(1, 4) << 4) | CURVE(1, 3),
CURVE(1, 5),
CURVE(1, 6),
(CURVE(1, 1) << 4) | CURVE(1, 0));
mdelay(10);
return 0;
}
#undef CURVE
static struct fbtft_display display = {
.regwidth = 8,
.width = WIDTH,
.height = HEIGHT,
.txbuflen = TXBUFLEN,
.gamma_num = 2,
.gamma_len = 15,
.gamma = DEFAULT_GAMMA,
.fbtftops = {
.init_display = init_display,
.set_addr_win = set_addr_win,
.set_var = set_var,
.set_gamma = set_gamma,
},
};
FBTFT_REGISTER_DRIVER(DRVNAME, "himax,hx8340bn", &display);
MODULE_ALIAS("spi:" DRVNAME);
MODULE_ALIAS("platform:" DRVNAME);
MODULE_ALIAS("spi:hx8340bn");
MODULE_ALIAS("platform:hx8340bn");
MODULE_DESCRIPTION("FB driver for the HX8340BN LCD Controller");
MODULE_AUTHOR("Noralf Tronnes");
MODULE_LICENSE("GPL");