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Message-Id: <20230406075622.8990-7-jpanis@baylibre.com>
Date: Thu, 6 Apr 2023 09:56:22 +0200
From: Julien Panis <jpanis@...libre.com>
To: lee@...nel.org, robh+dt@...nel.org,
krzysztof.kozlowski+dt@...aro.org, corbet@....net, arnd@...db.de,
gregkh@...uxfoundation.org, derek.kiernan@...inx.com,
dragan.cvetic@...inx.com
Cc: yi.l.liu@...el.com, jgg@...pe.ca, razor@...ckwall.org,
stephen@...workplumber.org, prabhakar.csengg@...il.com,
contact@...rsion.fr, macro@...am.me.uk, dsahern@...nel.org,
alex.williamson@...hat.com, akrowiak@...ux.ibm.com,
mark.rutland@....com, ye.xingchen@....com.cn, ojeda@...nel.org,
keescook@...omium.org, me@...enk.de, mhiramat@...nel.org,
milan@...verde.com, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
sterzik@...com, u-kumar1@...com, eblanc@...libre.com,
jneanne@...libre.com
Subject: [PATCH v6 6/6] samples: Add userspace example for TI TPS6594 PFSM
This patch adds an example showing how to use PFSM devices
from a userspace application. The PMIC is armed to be triggered
by a RTC alarm to execute state transition.
Signed-off-by: Julien Panis <jpanis@...libre.com>
---
samples/Kconfig | 6 ++
samples/Makefile | 1 +
samples/pfsm/.gitignore | 2 +
samples/pfsm/Makefile | 4 ++
samples/pfsm/pfsm-wakeup.c | 125 +++++++++++++++++++++++++++++++++++++
5 files changed, 138 insertions(+)
create mode 100644 samples/pfsm/.gitignore
create mode 100644 samples/pfsm/Makefile
create mode 100644 samples/pfsm/pfsm-wakeup.c
diff --git a/samples/Kconfig b/samples/Kconfig
index 30ef8bd48ba3..f23aa60a74cf 100644
--- a/samples/Kconfig
+++ b/samples/Kconfig
@@ -253,6 +253,12 @@ config SAMPLE_INTEL_MEI
help
Build a sample program to work with mei device.
+config SAMPLE_TPS6594_PFSM
+ bool "Build example program working with TPS6594 PFSM driver"
+ depends on HEADERS_INSTALL
+ help
+ Build a sample program to work with PFSM devices.
+
config SAMPLE_WATCHDOG
bool "watchdog sample"
depends on CC_CAN_LINK
diff --git a/samples/Makefile b/samples/Makefile
index 7cb632ef88ee..231e45d7ed70 100644
--- a/samples/Makefile
+++ b/samples/Makefile
@@ -31,6 +31,7 @@ obj-$(CONFIG_VIDEO_PCI_SKELETON) += v4l/
obj-y += vfio-mdev/
subdir-$(CONFIG_SAMPLE_VFS) += vfs
obj-$(CONFIG_SAMPLE_INTEL_MEI) += mei/
+obj-$(CONFIG_SAMPLE_TPS6594_PFSM) += pfsm/
subdir-$(CONFIG_SAMPLE_WATCHDOG) += watchdog
subdir-$(CONFIG_SAMPLE_WATCH_QUEUE) += watch_queue
obj-$(CONFIG_DEBUG_KMEMLEAK_TEST) += kmemleak/
diff --git a/samples/pfsm/.gitignore b/samples/pfsm/.gitignore
new file mode 100644
index 000000000000..f350a030a060
--- /dev/null
+++ b/samples/pfsm/.gitignore
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0
+/pfsm-wakeup
diff --git a/samples/pfsm/Makefile b/samples/pfsm/Makefile
new file mode 100644
index 000000000000..213e8d9f5dbc
--- /dev/null
+++ b/samples/pfsm/Makefile
@@ -0,0 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
+userprogs-always-y += pfsm-wakeup
+
+userccflags += -I usr/include
diff --git a/samples/pfsm/pfsm-wakeup.c b/samples/pfsm/pfsm-wakeup.c
new file mode 100644
index 000000000000..299dd9e1f607
--- /dev/null
+++ b/samples/pfsm/pfsm-wakeup.c
@@ -0,0 +1,125 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * TPS6594 PFSM userspace example
+ *
+ * Copyright (C) 2023 BayLibre Incorporated - https://www.baylibre.com/
+ *
+ * This example shows how to use PFSMs from a userspace application,
+ * on TI j721s2 platform. The PMIC is armed to be triggered by a RTC
+ * alarm to execute state transition (RETENTION to ACTIVE).
+ */
+
+#include <fcntl.h>
+#include <stdio.h>
+#include <sys/ioctl.h>
+#include <unistd.h>
+
+#include <linux/rtc.h>
+#include <linux/tps6594_pfsm.h>
+
+#define ALARM_DELTA_SEC 30
+
+#define RTC_A "/dev/rtc0"
+
+#define PMIC_NB 3
+#define PMIC_A "/dev/pfsm-0-0x48"
+#define PMIC_B "/dev/pfsm-0-0x4c"
+#define PMIC_C "/dev/pfsm-2-0x58"
+
+static const char * const dev_pfsm[] = {PMIC_A, PMIC_B, PMIC_C};
+
+int main(int argc, char *argv[])
+{
+ int i, ret, fd_rtc, fd_pfsm[PMIC_NB] = { 0 };
+ struct rtc_time rtc_tm;
+ struct pmic_state_opt pmic_opt = { 0 };
+ unsigned long data;
+
+ fd_rtc = open(RTC_A, O_RDONLY);
+ if (fd_rtc < 0) {
+ perror("Failed to open RTC device.");
+ goto out;
+ }
+
+ for (i = 0 ; i < PMIC_NB ; i++) {
+ fd_pfsm[i] = open(dev_pfsm[i], O_RDWR);
+ if (fd_pfsm[i] < 0) {
+ perror("Failed to open PFSM device.");
+ goto out;
+ }
+ }
+
+ /* Read RTC date/time */
+ ret = ioctl(fd_rtc, RTC_RD_TIME, &rtc_tm);
+ if (ret < 0) {
+ perror("Failed to read RTC date/time.");
+ goto out;
+ }
+ printf("Current RTC date/time is %d-%d-%d, %02d:%02d:%02d.\n",
+ rtc_tm.tm_mday, rtc_tm.tm_mon + 1, rtc_tm.tm_year + 1900,
+ rtc_tm.tm_hour, rtc_tm.tm_min, rtc_tm.tm_sec);
+
+ /* Set RTC alarm to ALARM_DELTA_SEC sec in the future, and check for rollover */
+ rtc_tm.tm_sec += ALARM_DELTA_SEC;
+ if (rtc_tm.tm_sec >= 60) {
+ rtc_tm.tm_sec %= 60;
+ rtc_tm.tm_min++;
+ }
+ if (rtc_tm.tm_min == 60) {
+ rtc_tm.tm_min = 0;
+ rtc_tm.tm_hour++;
+ }
+ if (rtc_tm.tm_hour == 24)
+ rtc_tm.tm_hour = 0;
+ ret = ioctl(fd_rtc, RTC_ALM_SET, &rtc_tm);
+ if (ret < 0) {
+ perror("Failed to set RTC alarm.");
+ goto out;
+ }
+
+ /* Enable alarm interrupts */
+ ret = ioctl(fd_rtc, RTC_AIE_ON, 0);
+ if (ret < 0) {
+ perror("Failed to enable alarm interrupts.");
+ goto out;
+ }
+ printf("Waiting %d seconds for alarm...\n", ALARM_DELTA_SEC);
+
+ /*
+ * Set RETENTION state with options for PMIC_C/B/A respectively.
+ * Since PMIC_A is master, it should be the last one to be configured.
+ */
+ pmic_opt.ddr_retention = 1;
+ for (i = PMIC_NB - 1 ; i >= 0 ; i--) {
+ printf("Set RETENTION state for PMIC_%d.\n", i);
+ sleep(1);
+ ret = ioctl(fd_pfsm[i], PMIC_SET_RETENTION_STATE, &pmic_opt);
+ if (ret < 0) {
+ perror("Failed to set RETENTION state.");
+ goto out_reset;
+ }
+ }
+
+ /* This blocks until the alarm ring causes an interrupt */
+ ret = read(fd_rtc, &data, sizeof(unsigned long));
+ if (ret < 0)
+ perror("Failed to get RTC alarm.");
+ else
+ puts("Alarm rang.\n");
+
+out_reset:
+ ioctl(fd_rtc, RTC_AIE_OFF, 0);
+
+ /* Set ACTIVE state for PMIC_A */
+ ioctl(fd_pfsm[0], PMIC_SET_ACTIVE_STATE, 0);
+
+out:
+ for (i = 0 ; i < PMIC_NB ; i++)
+ if (fd_pfsm[i])
+ close(fd_pfsm[i]);
+
+ if (fd_rtc)
+ close(fd_rtc);
+
+ return 0;
+}
--
2.37.3
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