/* $NetBSD: j6x0lcd.c,v 1.6 2005/02/28 16:57:56 uwe Exp $ */ /* * Copyright (c) 2004 Valeriy E. Ushakov * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include __KERNEL_RCSID(0, "$NetBSD: j6x0lcd.c,v 1.6 2005/02/28 16:57:56 uwe Exp $"); #include #include #include #include #ifdef GPROF #include #endif #include #include #include #include #include /* XXX: for hd64461_reg_read_2 &c */ #include #include /* * LCD power: controlled by pin 0 in HD64461 GPIO port B. * 0 - power on * 1 - power off */ #define HD64461_GPBDR_J6X0LCD_OFF 0x01 #define HD64461_GPBCR_J6X0LCD_OFF_MASK 0xfffc #define HD64461_GPBCR_J6X0LCD_OFF_BITS 0x0001 /* * LCD brightness: controlled by DAC channel 0. Larger channel values * mean dimmer. Values smaller (i.e. brighter) then 0x5e seems to * result in no visible changes. */ #define J6X0LCD_BRIGHTNESS_DA_MAX 0x5e #define J6X0LCD_BRIGHTNESS_DA_MIN 0xff #define J6X0LCD_DA_TO_BRIGHTNESS(da) \ (J6X0LCD_BRIGHTNESS_DA_MIN - (da)) #define J6X0LCD_BRIGHTNESS_TO_DA(br) \ (J6X0LCD_BRIGHTNESS_DA_MIN - (br)) #define J6X0LCD_BRIGHTNESS_MAX \ J6X0LCD_DA_TO_BRIGHTNESS(J6X0LCD_BRIGHTNESS_DA_MAX) /* convenience macro to accesses DAC registers */ #define DAC_(x) (*((volatile uint8_t *)SH7709_DA ## x)) /* * LCD contrast: controlled by pins 6,5,4,3 HD64461 GPIO port B. * 6th is the least significant bit, 3rd is the most significant. * The bits are inverted: .1111... = 0, .0111... = 1, etc. * * We control the contrast value by setting bits in the data register * to all ones, and changing the mode of the bits in the control * register, keeping "ones" in gpio output mode (1), and switching * "zeros" to input mode (3). This is what WinCE also does. * * Alternative method is to set the mode of all bits to gpio output * mode and then change the bits in the data register. This method * results in significantly less contrast screen for the same values. * E.g., WinCE default contrast value is 11 (in our numbering, 23 in * WinCE's) - which is fine in the "tweak the control register" * method, but is very blurry in the "tweak the data register" method. * Subjectively, 15 in the "tweak control" method looks like 7 in the * "tweak data" method. * * May be it's possible to control a wider range of contrast by * combining the two methods, but values above 7 in the "tweak data" * method are so blurry that they are next to unusable in practice. */ #define J6X0LCD_CONTRAST_MAX 15 #define HD64461_GPBDR_J6X0LCD_CONTRAST_MASK 0x87 #define HD64461_GPBDR_J6X0LCD_CONTRAST_BITS 0x78 #if 0 /* "tweak data" */ static uint8_t j6x0lcd_contrast_data_bits[] = { 0x78, 0x38, 0x58, 0x18, 0x68, 0x28, 0x48, 0x08, 0x70, 0x30, 0x50, 0x10, 0x60, 0x20, 0x40, 0x00 }; #endif #define HD64461_GPBCR_J6X0LCD_CONTRAST_MASK 0xc03f #define HD64461_GPBCR_J6X0LCD_CONTRAST_BITS 0x1540 /* "tweak control" */ static uint16_t j6x0lcd_contrast_control_bits[] = { 0x1540, 0x3540, 0x1d40, 0x3d40, 0x1740, 0x3740, 0x1f40, 0x3f40, 0x15c0, 0x35c0, 0x1dc0, 0x3dc0, 0x17c0, 0x37c0, 0x1fc0, 0x3fc0 }; struct j6x0lcd_softc { struct device sc_dev; int sc_brightness; int sc_contrast; }; static int j6x0lcd_match(struct device *, struct cfdata *, void *); static void j6x0lcd_attach(struct device *, struct device *, void *); CFATTACH_DECL(j6x0lcd, sizeof(struct j6x0lcd_softc), j6x0lcd_match, j6x0lcd_attach, NULL, NULL); static int j6x0lcd_param(void *, int, long, void *); static int j6x0lcd_power(void *, int, long, void *); static int j6x0lcd_match(struct device *parent, struct cfdata *cfp, void *aux) { /* * XXX: does platid_mask_MACH_HP_LX matches _JORNADA_6XX too? * Is 620 wired similarly? */ if (!platid_match(&platid, &platid_mask_MACH_HP_JORNADA_6XX)) return (0); if (strcmp(cfp->cf_name, "j6x0lcd") != 0) return (0); return (1); } static void j6x0lcd_attach(struct device *parent, struct device *self, void *aux) { struct j6x0lcd_softc *sc = (struct j6x0lcd_softc *)self; int contrast, i; uint16_t bcr, bdr; uint8_t dcr, ddr; /* * Brightness is controlled by DAC channel 0. */ dcr = DAC_(CR); dcr &= ~SH7709_DACR_DAE; /* want to control each channel separately */ dcr |= SH7709_DACR_DAOE0; /* enable channel 0 */ DAC_(CR) = dcr; ddr = DAC_(DR0); sc->sc_brightness = J6X0LCD_DA_TO_BRIGHTNESS(ddr); /* * Contrast and power are controlled by HD64461 GPIO port B. */ bcr = hd64461_reg_read_2(HD64461_GPBCR_REG16); bdr = hd64461_reg_read_2(HD64461_GPBDR_REG16); contrast = 0xf; /* bits are inverted */ for (i = 0; i < 4; ++i) { unsigned int c, v; c = (bcr >> ((6 - i) << 1)) & 0x3; if (c == 1) /* gpio mode? */ v = 1; else v = 0; contrast &= ~(v << i); } sc->sc_contrast = contrast; bdr &= ~HD64461_GPBDR_J6X0LCD_OFF; bdr |= HD64461_GPBDR_J6X0LCD_CONTRAST_BITS; hd64461_reg_write_2(HD64461_GPBDR_REG16, bdr); bcr &= HD64461_GPBCR_J6X0LCD_OFF_MASK & HD64461_GPBCR_J6X0LCD_CONTRAST_MASK; bcr |= HD64461_GPBCR_J6X0LCD_OFF_BITS | j6x0lcd_contrast_control_bits[contrast]; hd64461_reg_write_2(HD64461_GPBCR_REG16, bcr); printf(": brightness %d, contrast %d\n", sc->sc_brightness, sc->sc_contrast); /* LCD brightness hooks */ config_hook(CONFIG_HOOK_GET, CONFIG_HOOK_BRIGHTNESS_MAX, CONFIG_HOOK_SHARE, j6x0lcd_param, sc); config_hook(CONFIG_HOOK_GET, CONFIG_HOOK_BRIGHTNESS, CONFIG_HOOK_SHARE, j6x0lcd_param, sc); config_hook(CONFIG_HOOK_SET, CONFIG_HOOK_BRIGHTNESS, CONFIG_HOOK_SHARE, j6x0lcd_param, sc); /* LCD contrast hooks */ config_hook(CONFIG_HOOK_GET, CONFIG_HOOK_CONTRAST_MAX, CONFIG_HOOK_SHARE, j6x0lcd_param, sc); config_hook(CONFIG_HOOK_GET, CONFIG_HOOK_CONTRAST, CONFIG_HOOK_SHARE, j6x0lcd_param, sc); config_hook(CONFIG_HOOK_SET, CONFIG_HOOK_CONTRAST, CONFIG_HOOK_SHARE, j6x0lcd_param, sc); /* LCD on/off hook */ config_hook(CONFIG_HOOK_POWERCONTROL, CONFIG_HOOK_POWERCONTROL_LCD, CONFIG_HOOK_SHARE, j6x0lcd_power, sc); } static int j6x0lcd_param(ctx, type, id, msg) void *ctx; int type; long id; void *msg; { struct j6x0lcd_softc *sc = ctx; int value; uint16_t bcr; uint8_t dr; switch (type) { case CONFIG_HOOK_GET: switch (id) { case CONFIG_HOOK_CONTRAST: *(int *)msg = sc->sc_contrast; return (0); case CONFIG_HOOK_CONTRAST_MAX: *(int *)msg = J6X0LCD_CONTRAST_MAX; return (0); case CONFIG_HOOK_BRIGHTNESS: *(int *)msg = sc->sc_brightness; return (0); case CONFIG_HOOK_BRIGHTNESS_MAX: *(int *)msg = J6X0LCD_BRIGHTNESS_MAX; return (0); } break; case CONFIG_HOOK_SET: value = *(int *)msg; if (value < 0) value = 0; switch (id) { case CONFIG_HOOK_CONTRAST: if (value > J6X0LCD_CONTRAST_MAX) value = J6X0LCD_CONTRAST_MAX; sc->sc_contrast = value; bcr = hd64461_reg_read_2(HD64461_GPBCR_REG16); bcr &= HD64461_GPBCR_J6X0LCD_CONTRAST_MASK; bcr |= j6x0lcd_contrast_control_bits[value]; hd64461_reg_write_2(HD64461_GPBCR_REG16, bcr); return (0); case CONFIG_HOOK_BRIGHTNESS: if (value > J6X0LCD_BRIGHTNESS_MAX) value = J6X0LCD_BRIGHTNESS_MAX; sc->sc_brightness = value; dr = J6X0LCD_BRIGHTNESS_TO_DA(value); DAC_(DR0) = dr; return (0); } break; } return (EINVAL); } static int j6x0lcd_power(ctx, type, id, msg) void *ctx; int type; long id; void *msg; { int on; uint16_t r; if (type != CONFIG_HOOK_POWERCONTROL || id != CONFIG_HOOK_POWERCONTROL_LCD) return (EINVAL); on = (int)msg; r = hd64461_reg_read_2(HD64461_GPBDR_REG16); if (on) r &= ~HD64461_GPBDR_J6X0LCD_OFF; else r |= HD64461_GPBDR_J6X0LCD_OFF; hd64461_reg_write_2(HD64461_GPBDR_REG16, r); return (0); }