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Diffstat (limited to 'drivers/input/misc/hp_sdc_rtc.c')
-rw-r--r--drivers/input/misc/hp_sdc_rtc.c377
1 files changed, 377 insertions, 0 deletions
diff --git a/drivers/input/misc/hp_sdc_rtc.c b/drivers/input/misc/hp_sdc_rtc.c
new file mode 100644
index 000000000..199bc17dd
--- /dev/null
+++ b/drivers/input/misc/hp_sdc_rtc.c
@@ -0,0 +1,377 @@
+/*
+ * HP i8042 SDC + MSM-58321 BBRTC driver.
+ *
+ * Copyright (c) 2001 Brian S. Julin
+ * 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,
+ * without modification.
+ * 2. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL").
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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
+ *
+ * References:
+ * System Device Controller Microprocessor Firmware Theory of Operation
+ * for Part Number 1820-4784 Revision B. Dwg No. A-1820-4784-2
+ * efirtc.c by Stephane Eranian/Hewlett Packard
+ *
+ */
+
+#include <linux/hp_sdc.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/time.h>
+#include <linux/miscdevice.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/poll.h>
+#include <linux/rtc.h>
+#include <linux/mutex.h>
+#include <linux/semaphore.h>
+
+MODULE_AUTHOR("Brian S. Julin <bri@calyx.com>");
+MODULE_DESCRIPTION("HP i8042 SDC + MSM-58321 RTC Driver");
+MODULE_LICENSE("Dual BSD/GPL");
+
+#define RTC_VERSION "1.10d"
+
+static unsigned long epoch = 2000;
+
+static struct semaphore i8042tregs;
+
+static void hp_sdc_rtc_isr (int irq, void *dev_id,
+ uint8_t status, uint8_t data)
+{
+ return;
+}
+
+static int hp_sdc_rtc_do_read_bbrtc (struct rtc_time *rtctm)
+{
+ struct semaphore tsem;
+ hp_sdc_transaction t;
+ uint8_t tseq[91];
+ int i;
+
+ i = 0;
+ while (i < 91) {
+ tseq[i++] = HP_SDC_ACT_DATAREG |
+ HP_SDC_ACT_POSTCMD | HP_SDC_ACT_DATAIN;
+ tseq[i++] = 0x01; /* write i8042[0x70] */
+ tseq[i] = i / 7; /* BBRTC reg address */
+ i++;
+ tseq[i++] = HP_SDC_CMD_DO_RTCR; /* Trigger command */
+ tseq[i++] = 2; /* expect 1 stat/dat pair back. */
+ i++; i++; /* buffer for stat/dat pair */
+ }
+ tseq[84] |= HP_SDC_ACT_SEMAPHORE;
+ t.endidx = 91;
+ t.seq = tseq;
+ t.act.semaphore = &tsem;
+ sema_init(&tsem, 0);
+
+ if (hp_sdc_enqueue_transaction(&t)) return -1;
+
+ /* Put ourselves to sleep for results. */
+ if (WARN_ON(down_interruptible(&tsem)))
+ return -1;
+
+ /* Check for nonpresence of BBRTC */
+ if (!((tseq[83] | tseq[90] | tseq[69] | tseq[76] |
+ tseq[55] | tseq[62] | tseq[34] | tseq[41] |
+ tseq[20] | tseq[27] | tseq[6] | tseq[13]) & 0x0f))
+ return -1;
+
+ memset(rtctm, 0, sizeof(struct rtc_time));
+ rtctm->tm_year = (tseq[83] & 0x0f) + (tseq[90] & 0x0f) * 10;
+ rtctm->tm_mon = (tseq[69] & 0x0f) + (tseq[76] & 0x0f) * 10;
+ rtctm->tm_mday = (tseq[55] & 0x0f) + (tseq[62] & 0x0f) * 10;
+ rtctm->tm_wday = (tseq[48] & 0x0f);
+ rtctm->tm_hour = (tseq[34] & 0x0f) + (tseq[41] & 0x0f) * 10;
+ rtctm->tm_min = (tseq[20] & 0x0f) + (tseq[27] & 0x0f) * 10;
+ rtctm->tm_sec = (tseq[6] & 0x0f) + (tseq[13] & 0x0f) * 10;
+
+ return 0;
+}
+
+static int hp_sdc_rtc_read_bbrtc (struct rtc_time *rtctm)
+{
+ struct rtc_time tm, tm_last;
+ int i = 0;
+
+ /* MSM-58321 has no read latch, so must read twice and compare. */
+
+ if (hp_sdc_rtc_do_read_bbrtc(&tm_last)) return -1;
+ if (hp_sdc_rtc_do_read_bbrtc(&tm)) return -1;
+
+ while (memcmp(&tm, &tm_last, sizeof(struct rtc_time))) {
+ if (i++ > 4) return -1;
+ memcpy(&tm_last, &tm, sizeof(struct rtc_time));
+ if (hp_sdc_rtc_do_read_bbrtc(&tm)) return -1;
+ }
+
+ memcpy(rtctm, &tm, sizeof(struct rtc_time));
+
+ return 0;
+}
+
+
+static int64_t hp_sdc_rtc_read_i8042timer (uint8_t loadcmd, int numreg)
+{
+ hp_sdc_transaction t;
+ uint8_t tseq[26] = {
+ HP_SDC_ACT_PRECMD | HP_SDC_ACT_POSTCMD | HP_SDC_ACT_DATAIN,
+ 0,
+ HP_SDC_CMD_READ_T1, 2, 0, 0,
+ HP_SDC_ACT_POSTCMD | HP_SDC_ACT_DATAIN,
+ HP_SDC_CMD_READ_T2, 2, 0, 0,
+ HP_SDC_ACT_POSTCMD | HP_SDC_ACT_DATAIN,
+ HP_SDC_CMD_READ_T3, 2, 0, 0,
+ HP_SDC_ACT_POSTCMD | HP_SDC_ACT_DATAIN,
+ HP_SDC_CMD_READ_T4, 2, 0, 0,
+ HP_SDC_ACT_POSTCMD | HP_SDC_ACT_DATAIN,
+ HP_SDC_CMD_READ_T5, 2, 0, 0
+ };
+
+ t.endidx = numreg * 5;
+
+ tseq[1] = loadcmd;
+ tseq[t.endidx - 4] |= HP_SDC_ACT_SEMAPHORE; /* numreg assumed > 1 */
+
+ t.seq = tseq;
+ t.act.semaphore = &i8042tregs;
+
+ /* Sleep if output regs in use. */
+ if (WARN_ON(down_interruptible(&i8042tregs)))
+ return -1;
+
+ if (hp_sdc_enqueue_transaction(&t)) {
+ up(&i8042tregs);
+ return -1;
+ }
+
+ /* Sleep until results come back. */
+ if (WARN_ON(down_interruptible(&i8042tregs)))
+ return -1;
+
+ up(&i8042tregs);
+
+ return (tseq[5] |
+ ((uint64_t)(tseq[10]) << 8) | ((uint64_t)(tseq[15]) << 16) |
+ ((uint64_t)(tseq[20]) << 24) | ((uint64_t)(tseq[25]) << 32));
+}
+
+
+/* Read the i8042 real-time clock */
+static inline int hp_sdc_rtc_read_rt(struct timespec64 *res) {
+ int64_t raw;
+ uint32_t tenms;
+ unsigned int days;
+
+ raw = hp_sdc_rtc_read_i8042timer(HP_SDC_CMD_LOAD_RT, 5);
+ if (raw < 0) return -1;
+
+ tenms = (uint32_t)raw & 0xffffff;
+ days = (unsigned int)(raw >> 24) & 0xffff;
+
+ res->tv_nsec = (long)(tenms % 100) * 10000 * 1000;
+ res->tv_sec = (tenms / 100) + (time64_t)days * 86400;
+
+ return 0;
+}
+
+
+/* Read the i8042 fast handshake timer */
+static inline int hp_sdc_rtc_read_fhs(struct timespec64 *res) {
+ int64_t raw;
+ unsigned int tenms;
+
+ raw = hp_sdc_rtc_read_i8042timer(HP_SDC_CMD_LOAD_FHS, 2);
+ if (raw < 0) return -1;
+
+ tenms = (unsigned int)raw & 0xffff;
+
+ res->tv_nsec = (long)(tenms % 100) * 10000 * 1000;
+ res->tv_sec = (time64_t)(tenms / 100);
+
+ return 0;
+}
+
+
+/* Read the i8042 match timer (a.k.a. alarm) */
+static inline int hp_sdc_rtc_read_mt(struct timespec64 *res) {
+ int64_t raw;
+ uint32_t tenms;
+
+ raw = hp_sdc_rtc_read_i8042timer(HP_SDC_CMD_LOAD_MT, 3);
+ if (raw < 0) return -1;
+
+ tenms = (uint32_t)raw & 0xffffff;
+
+ res->tv_nsec = (long)(tenms % 100) * 10000 * 1000;
+ res->tv_sec = (time64_t)(tenms / 100);
+
+ return 0;
+}
+
+
+/* Read the i8042 delay timer */
+static inline int hp_sdc_rtc_read_dt(struct timespec64 *res) {
+ int64_t raw;
+ uint32_t tenms;
+
+ raw = hp_sdc_rtc_read_i8042timer(HP_SDC_CMD_LOAD_DT, 3);
+ if (raw < 0) return -1;
+
+ tenms = (uint32_t)raw & 0xffffff;
+
+ res->tv_nsec = (long)(tenms % 100) * 10000 * 1000;
+ res->tv_sec = (time64_t)(tenms / 100);
+
+ return 0;
+}
+
+
+/* Read the i8042 cycle timer (a.k.a. periodic) */
+static inline int hp_sdc_rtc_read_ct(struct timespec64 *res) {
+ int64_t raw;
+ uint32_t tenms;
+
+ raw = hp_sdc_rtc_read_i8042timer(HP_SDC_CMD_LOAD_CT, 3);
+ if (raw < 0) return -1;
+
+ tenms = (uint32_t)raw & 0xffffff;
+
+ res->tv_nsec = (long)(tenms % 100) * 10000 * 1000;
+ res->tv_sec = (time64_t)(tenms / 100);
+
+ return 0;
+}
+
+static int hp_sdc_rtc_proc_show(struct seq_file *m, void *v)
+{
+#define YN(bit) ("no")
+#define NY(bit) ("yes")
+ struct rtc_time tm;
+ struct timespec64 tv;
+
+ memset(&tm, 0, sizeof(struct rtc_time));
+
+ if (hp_sdc_rtc_read_bbrtc(&tm)) {
+ seq_puts(m, "BBRTC\t\t: READ FAILED!\n");
+ } else {
+ seq_printf(m,
+ "rtc_time\t: %ptRt\n"
+ "rtc_date\t: %ptRd\n"
+ "rtc_epoch\t: %04lu\n",
+ &tm, &tm, epoch);
+ }
+
+ if (hp_sdc_rtc_read_rt(&tv)) {
+ seq_puts(m, "i8042 rtc\t: READ FAILED!\n");
+ } else {
+ seq_printf(m, "i8042 rtc\t: %lld.%02ld seconds\n",
+ (s64)tv.tv_sec, (long)tv.tv_nsec/1000000L);
+ }
+
+ if (hp_sdc_rtc_read_fhs(&tv)) {
+ seq_puts(m, "handshake\t: READ FAILED!\n");
+ } else {
+ seq_printf(m, "handshake\t: %lld.%02ld seconds\n",
+ (s64)tv.tv_sec, (long)tv.tv_nsec/1000000L);
+ }
+
+ if (hp_sdc_rtc_read_mt(&tv)) {
+ seq_puts(m, "alarm\t\t: READ FAILED!\n");
+ } else {
+ seq_printf(m, "alarm\t\t: %lld.%02ld seconds\n",
+ (s64)tv.tv_sec, (long)tv.tv_nsec/1000000L);
+ }
+
+ if (hp_sdc_rtc_read_dt(&tv)) {
+ seq_puts(m, "delay\t\t: READ FAILED!\n");
+ } else {
+ seq_printf(m, "delay\t\t: %lld.%02ld seconds\n",
+ (s64)tv.tv_sec, (long)tv.tv_nsec/1000000L);
+ }
+
+ if (hp_sdc_rtc_read_ct(&tv)) {
+ seq_puts(m, "periodic\t: READ FAILED!\n");
+ } else {
+ seq_printf(m, "periodic\t: %lld.%02ld seconds\n",
+ (s64)tv.tv_sec, (long)tv.tv_nsec/1000000L);
+ }
+
+ seq_printf(m,
+ "DST_enable\t: %s\n"
+ "BCD\t\t: %s\n"
+ "24hr\t\t: %s\n"
+ "square_wave\t: %s\n"
+ "alarm_IRQ\t: %s\n"
+ "update_IRQ\t: %s\n"
+ "periodic_IRQ\t: %s\n"
+ "periodic_freq\t: %ld\n"
+ "batt_status\t: %s\n",
+ YN(RTC_DST_EN),
+ NY(RTC_DM_BINARY),
+ YN(RTC_24H),
+ YN(RTC_SQWE),
+ YN(RTC_AIE),
+ YN(RTC_UIE),
+ YN(RTC_PIE),
+ 1UL,
+ 1 ? "okay" : "dead");
+
+ return 0;
+#undef YN
+#undef NY
+}
+
+static int __init hp_sdc_rtc_init(void)
+{
+ int ret;
+
+#ifdef __mc68000__
+ if (!MACH_IS_HP300)
+ return -ENODEV;
+#endif
+
+ sema_init(&i8042tregs, 1);
+
+ if ((ret = hp_sdc_request_timer_irq(&hp_sdc_rtc_isr)))
+ return ret;
+
+ proc_create_single("driver/rtc", 0, NULL, hp_sdc_rtc_proc_show);
+
+ printk(KERN_INFO "HP i8042 SDC + MSM-58321 RTC support loaded "
+ "(RTC v " RTC_VERSION ")\n");
+
+ return 0;
+}
+
+static void __exit hp_sdc_rtc_exit(void)
+{
+ remove_proc_entry ("driver/rtc", NULL);
+ hp_sdc_release_timer_irq(hp_sdc_rtc_isr);
+ printk(KERN_INFO "HP i8042 SDC + MSM-58321 RTC support unloaded\n");
+}
+
+module_init(hp_sdc_rtc_init);
+module_exit(hp_sdc_rtc_exit);
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-18 23:29:45 +0000