Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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@baylibre.com>
Message-ID: <20230511095126.105104-7-jpanis@baylibre.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
authored by
Julien Panis
and committed by
Greg Kroah-Hartman
9e66fb52
dce54888
+138
+6
samples/Kconfig
+6
samples/Kconfig
···
253
253
help
254
254
Build a sample program to work with mei device.
255
255
256
+
config SAMPLE_TPS6594_PFSM
257
+
bool "Build example program working with TPS6594 PFSM driver"
258
+
depends on HEADERS_INSTALL
259
+
help
260
+
Build a sample program to work with PFSM devices.
261
+
256
262
config SAMPLE_WATCHDOG
257
263
bool "watchdog sample"
258
264
depends on CC_CAN_LINK
+1
samples/Makefile
+1
samples/Makefile
···
31
31
obj-y += vfio-mdev/
32
32
subdir-$(CONFIG_SAMPLE_VFS) += vfs
33
33
obj-$(CONFIG_SAMPLE_INTEL_MEI) += mei/
34
+
obj-$(CONFIG_SAMPLE_TPS6594_PFSM) += pfsm/
34
35
subdir-$(CONFIG_SAMPLE_WATCHDOG) += watchdog
35
36
subdir-$(CONFIG_SAMPLE_WATCH_QUEUE) += watch_queue
36
37
obj-$(CONFIG_SAMPLE_KMEMLEAK) += kmemleak/
+4
samples/pfsm/Makefile
+4
samples/pfsm/Makefile
+125
samples/pfsm/pfsm-wakeup.c
+125
samples/pfsm/pfsm-wakeup.c
···
1
+
// SPDX-License-Identifier: GPL-2.0
2
+
/*
3
+
* TPS6594 PFSM userspace example
4
+
*
5
+
* Copyright (C) 2023 BayLibre Incorporated - https://www.baylibre.com/
6
+
*
7
+
* This example shows how to use PFSMs from a userspace application,
8
+
* on TI j721s2 platform. The PMIC is armed to be triggered by a RTC
9
+
* alarm to execute state transition (RETENTION to ACTIVE).
10
+
*/
11
+
12
+
#include <fcntl.h>
13
+
#include <stdio.h>
14
+
#include <sys/ioctl.h>
15
+
#include <unistd.h>
16
+
17
+
#include <linux/rtc.h>
18
+
#include <linux/tps6594_pfsm.h>
19
+
20
+
#define ALARM_DELTA_SEC 30
21
+
22
+
#define RTC_A "/dev/rtc0"
23
+
24
+
#define PMIC_NB 3
25
+
#define PMIC_A "/dev/pfsm-0-0x48"
26
+
#define PMIC_B "/dev/pfsm-0-0x4c"
27
+
#define PMIC_C "/dev/pfsm-2-0x58"
28
+
29
+
static const char * const dev_pfsm[] = {PMIC_A, PMIC_B, PMIC_C};
30
+
31
+
int main(int argc, char *argv[])
32
+
{
33
+
int i, ret, fd_rtc, fd_pfsm[PMIC_NB] = { 0 };
34
+
struct rtc_time rtc_tm;
35
+
struct pmic_state_opt pmic_opt = { 0 };
36
+
unsigned long data;
37
+
38
+
fd_rtc = open(RTC_A, O_RDONLY);
39
+
if (fd_rtc < 0) {
40
+
perror("Failed to open RTC device.");
41
+
goto out;
42
+
}
43
+
44
+
for (i = 0 ; i < PMIC_NB ; i++) {
45
+
fd_pfsm[i] = open(dev_pfsm[i], O_RDWR);
46
+
if (fd_pfsm[i] < 0) {
47
+
perror("Failed to open PFSM device.");
48
+
goto out;
49
+
}
50
+
}
51
+
52
+
/* Read RTC date/time */
53
+
ret = ioctl(fd_rtc, RTC_RD_TIME, &rtc_tm);
54
+
if (ret < 0) {
55
+
perror("Failed to read RTC date/time.");
56
+
goto out;
57
+
}
58
+
printf("Current RTC date/time is %d-%d-%d, %02d:%02d:%02d.\n",
59
+
rtc_tm.tm_mday, rtc_tm.tm_mon + 1, rtc_tm.tm_year + 1900,
60
+
rtc_tm.tm_hour, rtc_tm.tm_min, rtc_tm.tm_sec);
61
+
62
+
/* Set RTC alarm to ALARM_DELTA_SEC sec in the future, and check for rollover */
63
+
rtc_tm.tm_sec += ALARM_DELTA_SEC;
64
+
if (rtc_tm.tm_sec >= 60) {
65
+
rtc_tm.tm_sec %= 60;
66
+
rtc_tm.tm_min++;
67
+
}
68
+
if (rtc_tm.tm_min == 60) {
69
+
rtc_tm.tm_min = 0;
70
+
rtc_tm.tm_hour++;
71
+
}
72
+
if (rtc_tm.tm_hour == 24)
73
+
rtc_tm.tm_hour = 0;
74
+
ret = ioctl(fd_rtc, RTC_ALM_SET, &rtc_tm);
75
+
if (ret < 0) {
76
+
perror("Failed to set RTC alarm.");
77
+
goto out;
78
+
}
79
+
80
+
/* Enable alarm interrupts */
81
+
ret = ioctl(fd_rtc, RTC_AIE_ON, 0);
82
+
if (ret < 0) {
83
+
perror("Failed to enable alarm interrupts.");
84
+
goto out;
85
+
}
86
+
printf("Waiting %d seconds for alarm...\n", ALARM_DELTA_SEC);
87
+
88
+
/*
89
+
* Set RETENTION state with options for PMIC_C/B/A respectively.
90
+
* Since PMIC_A is master, it should be the last one to be configured.
91
+
*/
92
+
pmic_opt.ddr_retention = 1;
93
+
for (i = PMIC_NB - 1 ; i >= 0 ; i--) {
94
+
printf("Set RETENTION state for PMIC_%d.\n", i);
95
+
sleep(1);
96
+
ret = ioctl(fd_pfsm[i], PMIC_SET_RETENTION_STATE, &pmic_opt);
97
+
if (ret < 0) {
98
+
perror("Failed to set RETENTION state.");
99
+
goto out_reset;
100
+
}
101
+
}
102
+
103
+
/* This blocks until the alarm ring causes an interrupt */
104
+
ret = read(fd_rtc, &data, sizeof(unsigned long));
105
+
if (ret < 0)
106
+
perror("Failed to get RTC alarm.");
107
+
else
108
+
puts("Alarm rang.\n");
109
+
110
+
out_reset:
111
+
ioctl(fd_rtc, RTC_AIE_OFF, 0);
112
+
113
+
/* Set ACTIVE state for PMIC_A */
114
+
ioctl(fd_pfsm[0], PMIC_SET_ACTIVE_STATE, 0);
115
+
116
+
out:
117
+
for (i = 0 ; i < PMIC_NB ; i++)
118
+
if (fd_pfsm[i])
119
+
close(fd_pfsm[i]);
120
+
121
+
if (fd_rtc)
122
+
close(fd_rtc);
123
+
124
+
return 0;
125
+
}