/* $NetBSD: panel_fdt.c,v 1.6 2021/01/27 03:10:21 thorpej Exp $ */

/* $NetBSD: panel_fdt.c,v 1.6 2021/01/27 03:10:21 thorpej Exp $ */

/*-
* Copyright (c) 2018 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Manuel Bouyer.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``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 FOUNDATION OR CONTRIBUTORS
* 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.
*/

/*
* lvds panel driver.
* specified in linux/Documentation/devicetree/bindings/display/panel/
* Simple RGB panels could be added as well
* registers an endpoint for use by graphic controller drivers
*
*/

#include <sys/cdefs.h>

__KERNEL_RCSID(1, "$NetBSD: panel_fdt.c,v 1.6 2021/01/27 03:10:21 thorpej Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/bus.h>
#include <sys/gpio.h>

#include <dev/fdt/fdtvar.h>
#include <dev/fdt/panel_fdt.h>

static int fdt_panel_match(device_t, cfdata_t, void *);
static void fdt_panel_attach(device_t, device_t, void *);
static void *fdt_panel_get_data(device_t, struct fdt_endpoint *);
static int fdt_panel_enable(device_t, struct fdt_endpoint *, bool);

struct fdt_panel_softc {
device_t sc_dev;
int sc_phandle;
struct fdt_panel sc_panel;
struct fdt_device_ports sc_ports;
#define MAX_GPIO_ENABLES 8
struct fdtbus_gpio_pin *sc_gpios_enable[MAX_GPIO_ENABLES];
};

CFATTACH_DECL_NEW(fdt_panel, sizeof(struct fdt_panel_softc),
fdt_panel_match, fdt_panel_attach, NULL, NULL);

static const struct device_compatible_entry compat_data[] = {
{ .compat = "panel-lvds", .value = PANEL_LVDS},
{ .compat = "panel-dual-lvds", .value = PANEL_DUAL_LVDS},
DEVICE_COMPAT_EOL
};

static int
fdt_panel_match(device_t parent, cfdata_t cf, void *aux)
{
const struct fdt_attach_args *faa = aux;

return of_compatible_match(faa->faa_phandle, compat_data);
}

static void
fdt_panel_attach(device_t parent, device_t self, void *aux)
{
struct fdt_panel_softc *sc = device_private(self);
const struct fdt_attach_args * const faa = aux;
const int phandle = faa->faa_phandle;
const struct display_timing * const timing =
&sc->sc_panel.panel_timing;
int child;
char buf[16];
const char *val;
int i;

sc->sc_dev = self;
sc->sc_phandle = phandle;
sc->sc_panel.panel_type =
of_compatible_lookup(phandle, compat_data)->value;

if (of_getprop_uint32(phandle, "width-mm", &sc->sc_panel.panel_width) ||
of_getprop_uint32(phandle, "height-mm", &sc->sc_panel.panel_height)){
aprint_error(": missing width-mm or height-mm properties\n");
return;
}
for (child = OF_child(phandle); child; child = OF_peer(child)) {
if (OF_getprop(child, "name", buf, sizeof(buf)) <= 0)
continue;
if (strcmp(buf, "panel-timing") != 0)
continue;

if (display_timing_parse(child,
&sc->sc_panel.panel_timing) != 0) {
aprint_error(": failed to parse panel-timing\n");
return;
}
}
if (sc->sc_panel.panel_timing.clock_freq == 0) {
aprint_error(": missing panel-timing\n");
return;
}
switch(sc->sc_panel.panel_type) {
case PANEL_LVDS:
case PANEL_DUAL_LVDS:
val = fdtbus_get_string(phandle, "data-mapping");
if (val == NULL) {
aprint_error(": missing data-mapping\n");
return;
}
if (strcmp(val, "jeida-18") == 0)
sc->sc_panel.panel_lvds_format = LVDS_JEIDA_18;
else if (strcmp(val, "jeida-24") == 0)
sc->sc_panel.panel_lvds_format = LVDS_JEIDA_24;
else if (strcmp(val, "vesa-24") == 0)
sc->sc_panel.panel_lvds_format = LVDS_VESA_24;
else {
aprint_error(": unknown data-mapping \"%s\"\n", val);
return;
}
break;
default:
panic("unknown panel type %d", sc->sc_panel.panel_type);
}

aprint_naive("\n");
aprint_normal(": %dx%d", timing->hactive, timing->vactive);
switch(sc->sc_panel.panel_type) {
case PANEL_LVDS:
aprint_normal(" LVDS");
break;
case PANEL_DUAL_LVDS:
aprint_normal(" dual-link LVDS");
break;
default:
panic(" unknown panel type %d", sc->sc_panel.panel_type);
}
aprint_normal(" panel\n");

for (i = 0; i < MAX_GPIO_ENABLES ; i++) {
sc->sc_gpios_enable[i] = fdtbus_gpio_acquire_index(phandle,
"enable-gpios", i, GPIO_PIN_OUTPUT);
if (sc->sc_gpios_enable[i] == NULL)
break;
}

aprint_verbose_dev(self, "%d enable GPIO%c\n", i, i > 1 ? 's' : ' ');

sc->sc_ports.dp_ep_get_data = fdt_panel_get_data;
sc->sc_ports.dp_ep_enable = fdt_panel_enable;
fdt_ports_register(&sc->sc_ports, self, phandle, EP_PANEL);
}

static void *
fdt_panel_get_data(device_t dev, struct fdt_endpoint *ep)
{
struct fdt_panel_softc *sc = device_private(dev);
return &sc->sc_panel;
}

static int
fdt_panel_enable(device_t dev, struct fdt_endpoint *ep, bool enable)
{
struct fdt_panel_softc *sc = device_private(dev);
for (int i = 0; i < MAX_GPIO_ENABLES ; i++) {
if (sc->sc_gpios_enable[i] == NULL)
break;
fdtbus_gpio_write(sc->sc_gpios_enable[i], enable);
}
return 0;
}