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1// SPDX-License-Identifier: GPL-2.02/*3 * TPS6594 PFSM userspace example4 *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 RTC9 * 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 3021 22#define RTC_A "/dev/rtc0"23 24#define PMIC_NB 325#define PMIC_A "/dev/pfsm-0-0x48"26#define PMIC_B "/dev/pfsm-0-0x4c"27#define PMIC_C "/dev/pfsm-2-0x58"28 29static const char * const dev_pfsm[] = {PMIC_A, PMIC_B, PMIC_C};30 31int 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 else108 puts("Alarm rang.\n");109 110out_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 116out: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}126