[src/trunk]: src/sys Add kernel API for pwm channels.

[jmcneill <jmcneill%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/c1c3557a7ae0
branches:  trunk
changeset: 322536:c1c3557a7ae0
user:      jmcneill <jmcneill%NetBSD.org@localhost>
date:      Sun May 06 10:32:33 2018 +0000

description:
Add kernel API for pwm channels.

diffstat:

 sys/conf/files        |   5 +++-
 sys/dev/pwm/files.pwm |   5 ++++
 sys/dev/pwm/pwm.c     |  63 +++++++++++++++++++++++++++++++++++++++++++++++++++
 sys/dev/pwm/pwmvar.h  |  59 +++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 131 insertions(+), 1 deletions(-)

diffs (158 lines):

diff -r 662966af5174 -r c1c3557a7ae0 sys/conf/files
--- a/sys/conf/files    Sun May 06 10:31:10 2018 +0000
+++ b/sys/conf/files    Sun May 06 10:32:33 2018 +0000
@@ -1,4 +1,4 @@
-#      $NetBSD: files,v 1.1198 2018/04/08 13:38:31 jmcneill Exp $
+#      $NetBSD: files,v 1.1199 2018/05/06 10:32:33 jmcneill Exp $
 #      @(#)files.newconf       7.5 (Berkeley) 5/10/93
 
 version        20171118
@@ -387,6 +387,9 @@
 # I2C device support
 include "dev/i2c/files.i2c"
 
+# PWM device support
+include "dev/pwm/files.pwm"
+
 # SPI device support
 include "dev/spi/files.spi"
 
diff -r 662966af5174 -r c1c3557a7ae0 sys/dev/pwm/files.pwm
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/dev/pwm/files.pwm     Sun May 06 10:32:33 2018 +0000
@@ -0,0 +1,5 @@
+# $NetBSD: files.pwm,v 1.1 2018/05/06 10:32:33 jmcneill Exp $
+
+define pwm
+
+file   dev/pwm/pwm.c                           pwm
diff -r 662966af5174 -r c1c3557a7ae0 sys/dev/pwm/pwm.c
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/dev/pwm/pwm.c Sun May 06 10:32:33 2018 +0000
@@ -0,0 +1,63 @@
+/* $NetBSD: pwm.c,v 1.1 2018/05/06 10:32:33 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.c,v 1.1 2018/05/06 10:32:33 jmcneill Exp $");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/device.h>
+
+#include <dev/pwm/pwmvar.h>
+
+int
+pwm_enable(pwm_tag_t pwm)
+{
+       return pwm->pwm_enable(pwm, true);
+}
+
+int
+pwm_disable(pwm_tag_t pwm)
+{
+       return pwm->pwm_enable(pwm, false);
+}
+
+int
+pwm_get_config(pwm_tag_t pwm, struct pwm_config *conf)
+{
+       return pwm->pwm_get_config(pwm, conf);
+}
+
+int
+pwm_set_config(pwm_tag_t pwm, const struct pwm_config *conf)
+{
+       if (conf->period < conf->duty_cycle)
+               return EINVAL;
+
+       return pwm->pwm_set_config(pwm, conf);
+}
diff -r 662966af5174 -r c1c3557a7ae0 sys/dev/pwm/pwmvar.h
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/dev/pwm/pwmvar.h      Sun May 06 10:32:33 2018 +0000
@@ -0,0 +1,59 @@
+/* $NetBSD: pwmvar.h,v 1.1 2018/05/06 10:32:33 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.
+ */
+
+#ifndef _DEV_PWM_PWMVAR_H
+#define _DEV_PWM_PWMVAR_H
+
+enum pwm_polarity {
+       PWM_ACTIVE_HIGH,
+       PWM_ACTIVE_LOW
+};
+
+struct pwm_config {
+       u_int   period;                 /* nanoseconds */
+       u_int   duty_cycle;             /* nanoseconds */
+       enum pwm_polarity polarity;     /* PWM_ACTIVE_{HIGH,LOW} */
+};
+
+typedef struct pwm_controller {
+       int     (*pwm_enable)(struct pwm_controller *, bool);
+       int     (*pwm_get_config)(struct pwm_controller *,
+                                 struct pwm_config *);
+       int     (*pwm_set_config)(struct pwm_controller *,
+                                 const struct pwm_config *);
+
+       device_t pwm_dev;               /* device */
+       void    *pwm_priv;              /* driver private data */
+} *pwm_tag_t;
+
+int    pwm_enable(pwm_tag_t);
+int    pwm_disable(pwm_tag_t);
+int    pwm_get_config(pwm_tag_t, struct pwm_config *);
+int    pwm_set_config(pwm_tag_t, const struct pwm_config *);
+
+#endif /* _DEV_PWM_PWMVAR_H */