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[src/trunk]: src/sys/dev/fdt Add support for PWM backlights.
details: https://anonhg.NetBSD.org/src/rev/43f753cbbb28
branches: trunk
changeset: 318828:43f753cbbb28
user: jmcneill <jmcneill%NetBSD.org@localhost>
date: Sun May 06 10:33:21 2018 +0000
description:
Add support for PWM backlights.
diffstat:
sys/dev/fdt/fdt_pwm.c | 116 +++++++++++++++++
sys/dev/fdt/fdtvar.h | 11 +-
sys/dev/fdt/files.fdt | 9 +-
sys/dev/fdt/pwm_backlight.c | 293 ++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 426 insertions(+), 3 deletions(-)
diffs (truncated from 498 to 300 lines):
diff -r a3ec9774e511 -r 43f753cbbb28 sys/dev/fdt/fdt_pwm.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/dev/fdt/fdt_pwm.c Sun May 06 10:33:21 2018 +0000
@@ -0,0 +1,116 @@
+/* $NetBSD: fdt_pwm.c,v 1.1 2018/05/06 10:33:21 jmcneill Exp $ */
+
+/*-
+ * Copyright (c) 2018 Jared McNeill <jmcneill%invisible.ca@localhost>
+ * 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.
+ *
+ * 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 <sys/cdefs.h>
+__KERNEL_RCSID(0, "$NetBSD: fdt_pwm.c,v 1.1 2018/05/06 10:33:21 jmcneill Exp $");
+
+#include <sys/param.h>
+#include <sys/bus.h>
+#include <sys/kmem.h>
+
+#include <libfdt.h>
+#include <dev/fdt/fdtvar.h>
+
+struct fdtbus_pwm_controller {
+ device_t pc_dev;
+ int pc_phandle;
+ const struct fdtbus_pwm_controller_func *pc_funcs;
+
+ struct fdtbus_pwm_controller *pc_next;
+};
+
+static struct fdtbus_pwm_controller *fdtbus_pc = NULL;
+
+int
+fdtbus_register_pwm_controller(device_t dev, int phandle,
+ const struct fdtbus_pwm_controller_func *funcs)
+{
+ struct fdtbus_pwm_controller *pc;
+
+ pc = kmem_alloc(sizeof(*pc), KM_SLEEP);
+ pc->pc_dev = dev;
+ pc->pc_phandle = phandle;
+ pc->pc_funcs = funcs;
+
+ pc->pc_next = fdtbus_pc;
+ fdtbus_pc = pc;
+
+ return 0;
+}
+
+static struct fdtbus_pwm_controller *
+fdtbus_get_pwm_controller(int phandle)
+{
+ struct fdtbus_pwm_controller *pc;
+
+ for (pc = fdtbus_pc; pc; pc = pc->pc_next) {
+ if (pc->pc_phandle == phandle) {
+ return pc;
+ }
+ }
+
+ return NULL;
+}
+
+pwm_tag_t
+fdtbus_pwm_acquire(int phandle, const char *prop)
+{
+ return fdtbus_pwm_acquire_index(phandle, prop, 0);
+}
+
+pwm_tag_t
+fdtbus_pwm_acquire_index(int phandle, const char *prop, int index)
+{
+ struct fdtbus_pwm_controller *pc;
+ const uint32_t *pwms, *p;
+ u_int n, pwm_cells;
+ int len, resid;
+
+ pwms = fdtbus_get_prop(phandle, prop, &len);
+ if (pwms == NULL)
+ return NULL;
+
+ p = pwms;
+ for (n = 0, resid = len; resid > 0; n++) {
+ const int pc_phandle =
+ fdtbus_get_phandle_from_native(be32toh(p[0]));
+ if (of_getprop_uint32(pc_phandle, "#pwm-cells", &pwm_cells))
+ break;
+ if (n == index) {
+ pc = fdtbus_get_pwm_controller(pc_phandle);
+ if (pc == NULL)
+ return NULL;
+ return pc->pc_funcs->get_tag(pc->pc_dev,
+ &p[0], (pwm_cells + 1) * 4);
+ }
+ resid -= (pwm_cells + 1) * 4;
+ p += pwm_cells + 1;
+ }
+
+ return NULL;
+}
diff -r a3ec9774e511 -r 43f753cbbb28 sys/dev/fdt/fdtvar.h
--- a/sys/dev/fdt/fdtvar.h Sun May 06 10:32:33 2018 +0000
+++ b/sys/dev/fdt/fdtvar.h Sun May 06 10:33:21 2018 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: fdtvar.h,v 1.29 2018/04/07 18:05:08 bouyer Exp $ */
+/* $NetBSD: fdtvar.h,v 1.30 2018/05/06 10:33:21 jmcneill Exp $ */
/*-
* Copyright (c) 2015 Jared D. McNeill <jmcneill%invisible.ca@localhost>
@@ -34,6 +34,7 @@
#include <sys/termios.h>
#include <dev/i2c/i2cvar.h>
+#include <dev/pwm/pwmvar.h>
#include <dev/clk/clk.h>
#include <dev/clock_subr.h>
@@ -185,6 +186,10 @@
int (*enable)(device_t, void *, bool);
};
+struct fdtbus_pwm_controller_func {
+ pwm_tag_t (*get_tag)(device_t, const void *, size_t);
+};
+
struct fdtbus_mmc_pwrseq;
struct fdtbus_mmc_pwrseq_func {
@@ -234,6 +239,8 @@
const struct fdtbus_power_controller_func *);
int fdtbus_register_phy_controller(device_t, int,
const struct fdtbus_phy_controller_func *);
+int fdtbus_register_pwm_controller(device_t, int,
+ const struct fdtbus_pwm_controller_func *);
int fdtbus_register_mmc_pwrseq(device_t, int,
const struct fdtbus_mmc_pwrseq_func *);
@@ -257,6 +264,8 @@
void fdtbus_gpio_write(struct fdtbus_gpio_pin *, int);
int fdtbus_gpio_read_raw(struct fdtbus_gpio_pin *);
void fdtbus_gpio_write_raw(struct fdtbus_gpio_pin *, int);
+pwm_tag_t fdtbus_pwm_acquire(int, const char *);
+pwm_tag_t fdtbus_pwm_acquire_index(int, const char *, int);
void fdtbus_pinctrl_configure(void);
int fdtbus_pinctrl_set_config_index(int, u_int);
int fdtbus_pinctrl_set_config(int, const char *);
diff -r a3ec9774e511 -r 43f753cbbb28 sys/dev/fdt/files.fdt
--- a/sys/dev/fdt/files.fdt Sun May 06 10:32:33 2018 +0000
+++ b/sys/dev/fdt/files.fdt Sun May 06 10:33:21 2018 +0000
@@ -1,10 +1,10 @@
-# $NetBSD: files.fdt,v 1.24 2018/05/01 23:59:15 jmcneill Exp $
+# $NetBSD: files.fdt,v 1.25 2018/05/06 10:33:21 jmcneill Exp $
include "external/bsd/libfdt/conf/files.libfdt"
defflag opt_fdt.h FDT: libfdt, ofw_subr
-define fdtbus { } : clk
+define fdtbus { } : clk, pwm
device fdt { [pass = 10] } : fdtbus
attach fdt at fdtbus
@@ -54,6 +54,7 @@
file dev/fdt/fdt_mmc_pwrseq.c fdtbus
file dev/fdt/fdt_phy.c fdtbus
file dev/fdt/fdt_power.c fdtbus
+file dev/fdt/fdt_pwm.c fdtbus
file dev/fdt/fdt_regulator.c fdtbus
file dev/fdt/fdt_reset.c fdtbus
file dev/fdt/fdt_rtc.c fdtbus
@@ -67,6 +68,10 @@
attach mmcpwrseq at fdt
file dev/fdt/mmc_pwrseq_simple.c mmcpwrseq
+device pwmbacklight
+attach pwmbacklight at fdt
+file dev/fdt/pwm_backlight.c pwmbacklight
+
define fdt_display_timing
file dev/fdt/display_timing.c fdt_display_timing
diff -r a3ec9774e511 -r 43f753cbbb28 sys/dev/fdt/pwm_backlight.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/dev/fdt/pwm_backlight.c Sun May 06 10:33:21 2018 +0000
@@ -0,0 +1,293 @@
+/* $NetBSD: pwm_backlight.c,v 1.1 2018/05/06 10:33:21 jmcneill Exp $ */
+
+/*-
+ * Copyright (c) 2018 Jared McNeill <jmcneill%invisible.ca@localhost>
+ * 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.
+ *
+ * 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 <sys/cdefs.h>
+__KERNEL_RCSID(0, "$NetBSD: pwm_backlight.c,v 1.1 2018/05/06 10:33:21 jmcneill Exp $");
+
+#include <sys/param.h>
+#include <sys/bus.h>
+#include <sys/device.h>
+#include <sys/systm.h>
+#include <sys/sysctl.h>
+#include <sys/kmem.h>
+#include <sys/gpio.h>
+
+#include <dev/pwm/pwmvar.h>
+
+#include <dev/fdt/fdtvar.h>
+
+struct pwm_backlight_softc {
+ device_t sc_dev;
+ pwm_tag_t sc_pwm;
+ struct fdtbus_gpio_pin *sc_pin;
+
+ u_int *sc_levels;
+ u_int sc_nlevels;
+
+ char *sc_levelstr;
+};
+
+static int pwm_backlight_match(device_t, cfdata_t, void *);
+static void pwm_backlight_attach(device_t, device_t, void *);
+
+static void pwm_backlight_sysctl_init(struct pwm_backlight_softc *);
+static void pwm_backlight_pmf_init(struct pwm_backlight_softc *);
+static void pwm_backlight_set(struct pwm_backlight_softc *, u_int);
+static u_int pwm_backlight_get(struct pwm_backlight_softc *);
+
+static const char *compatible[] = {
+ "pwm-backlight",
+ NULL
+};
+
+CFATTACH_DECL_NEW(pwmbacklight, sizeof(struct pwm_backlight_softc),
+ pwm_backlight_match, pwm_backlight_attach, NULL, NULL);
+
+static int
+pwm_backlight_match(device_t parent, cfdata_t cf, void *aux)
+{
+ struct fdt_attach_args * const faa = aux;
+
+ return of_match_compatible(faa->faa_phandle, compatible);
+}
+
+static void
+pwm_backlight_attach(device_t parent, device_t self, void *aux)
+{
+ struct pwm_backlight_softc * const sc = device_private(self);
+ struct fdt_attach_args * const faa = aux;
+ const int phandle = faa->faa_phandle;
+ const u_int *levels;
+ u_int default_level;
+ u_int n;
+ int len;
+
+ sc->sc_dev = self;
+ sc->sc_pwm = fdtbus_pwm_acquire(phandle, "pwms");
+ if (sc->sc_pwm == NULL) {
+ aprint_error(": couldn't acquire pwm\n");
+ return;
+ }
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