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@@ -0,0 +1,613 @@
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+/*
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+ * Real Time Clock driver for WL-HDD
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+ *
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+ * Copyright (C) 2007 Andreas Engel
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+ *
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+ * Hacked together mostly by copying the relevant code parts from:
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+ * drivers/i2c/i2c-bcm5365.c
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+ * drivers/i2c/i2c-algo-bit.c
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+ * drivers/char/rtc.c
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+ *
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+ * Note 1:
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+ * This module uses the standard char device (10,135), while the Asus module
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+ * rtcdrv.o uses (12,0). So, both can coexist which might be handy during
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+ * development (but see the comment in rtc_open()).
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+ *
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+ * Note 2:
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+ * You might need to set the clock once after loading the driver the first
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+ * time because the driver switches the chip into 24h mode if it is running
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+ * in 12h mode.
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+ *
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+ * Usage:
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+ * For compatibility reasons with the original asus driver, the time can be
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+ * read and set via the /dev/rtc device entry. The only accepted data format
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+ * is "YYYY:MM:DD:W:HH:MM:SS\n". See OpenWrt wiki for a script which handles
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+ * this format.
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+ *
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+ * In addition, this driver supports the standard ioctl() calls for setting
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+ * and reading the hardware clock, so the ordinary hwclock utility can also
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+ * be used.
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+ *
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+ * This program is free software; you can redistribute it and/or
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+ * modify it under the terms of the GNU General Public License
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+ * as published by the Free Software Foundation; either version
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+ * 2 of the License, or (at your option) any later version.
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+ *
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+ * TODO:
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+ * - add a /proc/driver/rtc interface?
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+ * - make the battery failure bit available through the /proc interface?
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+ *
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+ * $Id: rtc.c 7 2007-05-25 19:37:01Z ae $
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+ */
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+
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+#include <linux/module.h>
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+#include <linux/kmod.h>
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+#include <linux/kernel.h>
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+#include <linux/types.h>
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+#include <linux/miscdevice.h>
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+#include <linux/ioport.h>
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+#include <linux/fcntl.h>
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+#include <linux/mc146818rtc.h>
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+#include <linux/init.h>
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+#include <linux/spinlock.h>
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+#include <linux/rtc.h>
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+#include <linux/delay.h>
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+#include <linux/version.h>
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+#include <linux/gpio.h>
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+#include <linux/uaccess.h>
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+
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+#include <asm/current.h>
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+#if LINUX_VERSION_CODE < KERNEL_VERSION(3,4,0)
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+#include <asm/system.h>
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+#endif
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+
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+#include <bcm47xx.h>
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+#include <linux/bcm47xx_nvram.h>
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+
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+#define RTC_IS_OPEN 0x01 /* Means /dev/rtc is in use. */
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+
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+/* Can be changed via a module parameter. */
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+static int rtc_debug = 0;
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+
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+static unsigned long rtc_status = 0; /* Bitmapped status byte. */
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+
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+/* These settings are platform dependents. */
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+unsigned int sda_index = 0;
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+unsigned int scl_index = 0;
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+
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+#define I2C_READ_MASK 1
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+#define I2C_WRITE_MASK 0
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+
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+#define I2C_ACK 1
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+#define I2C_NAK 0
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+
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+#define RTC_EPOCH 1900
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+#define RTC_I2C_ADDRESS (0x32 << 1)
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+#define RTC_24HOUR_MODE_MASK 0x20
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+#define RTC_PM_MASK 0x20
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+#define RTC_VDET_MASK 0x40
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+#define RTC_Y2K_MASK 0x80
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+
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+/*
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+ * Delay in microseconds for generating the pulses on the I2C bus. We use
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+ * a rather conservative setting here. See datasheet of the RTC chip.
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+ */
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+#define ADAP_DELAY 50
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+
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+/* Avoid spurious compiler warnings. */
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+#define UNUSED __attribute__((unused))
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+
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+MODULE_AUTHOR("Andreas Engel");
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+MODULE_LICENSE("GPL");
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+
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+/* Test stolen from switch-adm.c. */
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+module_param(rtc_debug, int, 0);
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+
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+static inline void sdalo(void)
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+{
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+ gpio_direction_output(sda_index, 1);
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+ udelay(ADAP_DELAY);
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+}
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+
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+static inline void sdahi(void)
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+{
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+ gpio_direction_input(sda_index);
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+ udelay(ADAP_DELAY);
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+}
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+
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+static inline void scllo(void)
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+{
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+ gpio_direction_output(scl_index, 1);
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+ udelay(ADAP_DELAY);
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+}
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+
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+static inline int getscl(void)
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+{
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+ return (gpio_get_value(scl_index));
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+}
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+
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+static inline int getsda(void)
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+{
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+ return (gpio_get_value(sda_index));
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+}
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+
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+/*
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+ * We shouldn't simply set the SCL pin to high. Like SDA, the SCL line is
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+ * bidirectional too. According to the I2C spec, the slave is allowed to
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+ * pull down the SCL line to slow down the clock, so we need to check this.
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+ * Generally, we'd need a timeout here, but in our case, we just check the
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+ * line, assuming the RTC chip behaves well.
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+ */
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+static int sclhi(void)
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+{
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+ gpio_direction_input(scl_index);
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+ udelay(ADAP_DELAY);
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+ if (!getscl()) {
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+ printk(KERN_ERR "SCL pin should be low\n");
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+ return -ETIMEDOUT;
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+ }
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+ return 0;
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+}
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+
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+static void i2c_start(void)
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+{
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+ sdalo();
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+ scllo();
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+}
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+
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+static void i2c_stop(void)
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+{
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+ sdalo();
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+ sclhi();
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+ sdahi();
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+}
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+
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+static int i2c_outb(int c)
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+{
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+ int i;
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+ int ack;
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+
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+ /* assert: scl is low */
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+ for (i = 7; i >= 0; i--) {
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+ if (c & ( 1 << i )) {
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+ sdahi();
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+ } else {
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+ sdalo();
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+ }
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+ if (sclhi() < 0) { /* timed out */
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+ sdahi(); /* we don't want to block the net */
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+ return -ETIMEDOUT;
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+ };
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+ scllo();
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+ }
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+ sdahi();
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+ if (sclhi() < 0) {
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+ return -ETIMEDOUT;
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+ };
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+ /* read ack: SDA should be pulled down by slave */
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+ ack = getsda() == 0; /* ack: sda is pulled low ->success. */
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+ scllo();
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+
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+ if (rtc_debug)
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+ printk(KERN_DEBUG "i2c_outb(0x%02x) -> %s\n",
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+ c, ack ? "ACK": "NAK");
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+
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+ return ack; /* return 1 if device acked */
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+ /* assert: scl is low (sda undef) */
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+}
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+
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+static int i2c_inb(int ack)
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+{
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+ int i;
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+ unsigned int indata = 0;
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+
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+ /* assert: scl is low */
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+
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+ sdahi();
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+ for (i = 0; i < 8; i++) {
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+ if (sclhi() < 0) {
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+ return -ETIMEDOUT;
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+ };
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+ indata *= 2;
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+ if (getsda())
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+ indata |= 0x01;
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+ scllo();
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+ }
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+ if (ack) {
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+ sdalo();
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+ } else {
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+ sdahi();
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+ }
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+
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+ if (sclhi() < 0) {
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+ sdahi();
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+ return -ETIMEDOUT;
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+ }
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+ scllo();
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+ sdahi();
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+
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+ if (rtc_debug)
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+ printk(KERN_DEBUG "i2c_inb() -> 0x%02x\n", indata);
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+
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+ /* assert: scl is low */
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+ return indata & 0xff;
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+}
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+
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+static void i2c_init(void)
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+{
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+ /* no gpio_control for EXTIF */
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+ // ssb_gpio_control(&ssb, sda_mask | scl_mask, 0);
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+
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+ gpio_set_value(sda_index, 0);
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+ gpio_set_value(scl_index, 0);
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+ sdahi();
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+ sclhi();
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+}
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+
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+static int rtc_open(UNUSED struct inode *inode, UNUSED struct file *filp)
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+{
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+ spin_lock_irq(&rtc_lock);
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+
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+ if (rtc_status & RTC_IS_OPEN) {
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+ spin_unlock_irq(&rtc_lock);
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+ return -EBUSY;
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+ }
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+
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+ rtc_status |= RTC_IS_OPEN;
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+
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+ /*
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+ * The following call is only necessary if we use both this driver and
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+ * the proprietary one from asus at the same time (which, b.t.w. only
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+ * makes sense during development). Otherwise, each access via the asus
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+ * driver will make access via this driver impossible.
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+ */
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+ i2c_init();
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+
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+ spin_unlock_irq(&rtc_lock);
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+
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+ return 0;
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+}
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+
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+static int rtc_release(UNUSED struct inode *inode, UNUSED struct file *filp)
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+{
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+ /* No need for locking here. */
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+ rtc_status &= ~RTC_IS_OPEN;
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+ return 0;
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+}
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+
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+static int from_bcd(int bcdnum)
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+{
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+ int fac, num = 0;
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+
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+ for (fac = 1; bcdnum; fac *= 10) {
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+ num += (bcdnum % 16) * fac;
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+ bcdnum /= 16;
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+ }
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+
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+ return num;
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+}
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+
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+static int to_bcd(int decnum)
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+{
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+ int fac, num = 0;
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+
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+ for (fac = 1; decnum; fac *= 16) {
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+ num += (decnum % 10) * fac;
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+ decnum /= 10;
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+ }
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+
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+ return num;
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+}
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+
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+static void get_rtc_time(struct rtc_time *rtc_tm)
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+{
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+ int cr2;
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+
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+ /*
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+ * Read date and time from the RTC. We use read method (3).
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+ */
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+
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+ spin_lock_irq(&rtc_lock);
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+ i2c_start();
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+ i2c_outb(RTC_I2C_ADDRESS | I2C_READ_MASK);
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+ cr2 = i2c_inb(I2C_ACK);
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+ rtc_tm->tm_sec = i2c_inb(I2C_ACK);
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+ rtc_tm->tm_min = i2c_inb(I2C_ACK);
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+ rtc_tm->tm_hour = i2c_inb(I2C_ACK);
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+ rtc_tm->tm_wday = i2c_inb(I2C_ACK);
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+ rtc_tm->tm_mday = i2c_inb(I2C_ACK);
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+ rtc_tm->tm_mon = i2c_inb(I2C_ACK);
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+ rtc_tm->tm_year = i2c_inb(I2C_NAK);
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+ i2c_stop();
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+ spin_unlock_irq(&rtc_lock);
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+
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+ if (cr2 & RTC_VDET_MASK) {
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+ printk(KERN_WARNING "***RTC BATTERY FAILURE***\n");
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+ }
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+
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+ /* Handle century bit */
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+ if (rtc_tm->tm_mon & RTC_Y2K_MASK) {
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+ rtc_tm->tm_mon &= ~RTC_Y2K_MASK;
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+ rtc_tm->tm_year += 0x100;
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+ }
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+
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+ rtc_tm->tm_sec = from_bcd(rtc_tm->tm_sec);
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+ rtc_tm->tm_min = from_bcd(rtc_tm->tm_min);
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+ rtc_tm->tm_hour = from_bcd(rtc_tm->tm_hour);
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+ rtc_tm->tm_mday = from_bcd(rtc_tm->tm_mday);
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+ rtc_tm->tm_mon = from_bcd(rtc_tm->tm_mon) - 1;
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+ rtc_tm->tm_year = from_bcd(rtc_tm->tm_year);
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+
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+ rtc_tm->tm_isdst = -1; /* DST not known */
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+}
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+
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+static void set_rtc_time(struct rtc_time *rtc_tm)
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+{
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+ rtc_tm->tm_sec = to_bcd(rtc_tm->tm_sec);
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+ rtc_tm->tm_min = to_bcd(rtc_tm->tm_min);
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+ rtc_tm->tm_hour = to_bcd(rtc_tm->tm_hour);
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+ rtc_tm->tm_mday = to_bcd(rtc_tm->tm_mday);
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+ rtc_tm->tm_mon = to_bcd(rtc_tm->tm_mon + 1);
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+ rtc_tm->tm_year = to_bcd(rtc_tm->tm_year);
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+
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+ if (rtc_tm->tm_year >= 0x100) {
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+ rtc_tm->tm_year -= 0x100;
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+ rtc_tm->tm_mon |= RTC_Y2K_MASK;
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+ }
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+
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+ spin_lock_irq(&rtc_lock);
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+ i2c_start();
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+ i2c_outb(RTC_I2C_ADDRESS | I2C_WRITE_MASK);
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+ i2c_outb(0x00); /* set starting register to 0 (=seconds) */
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+ i2c_outb(rtc_tm->tm_sec);
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+ i2c_outb(rtc_tm->tm_min);
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+ i2c_outb(rtc_tm->tm_hour);
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+ i2c_outb(rtc_tm->tm_wday);
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+ i2c_outb(rtc_tm->tm_mday);
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+ i2c_outb(rtc_tm->tm_mon);
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+ i2c_outb(rtc_tm->tm_year);
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+ i2c_stop();
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+ spin_unlock_irq(&rtc_lock);
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+}
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+
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+static ssize_t rtc_write(UNUSED struct file *filp, const char *buf,
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+ size_t count, loff_t *ppos)
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+{
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+ struct rtc_time rtc_tm;
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+ char buffer[23];
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+ char *p;
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+
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+ if (!capable(CAP_SYS_TIME))
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+ return -EACCES;
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+
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+ if (ppos != &filp->f_pos)
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+ return -ESPIPE;
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+
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+ /*
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+ * For simplicity, the only acceptable format is:
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+ * YYYY:MM:DD:W:HH:MM:SS\n
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+ */
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+
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+ if (count != 22)
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+ goto err_out;
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+
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+ if (copy_from_user(buffer, buf, count))
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+ return -EFAULT;
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+
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+ buffer[sizeof(buffer)-1] = '\0';
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+
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+ p = &buffer[0];
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+
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+ rtc_tm.tm_year = simple_strtoul(p, &p, 10);
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+ if (*p++ != ':') goto err_out;
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+
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+ rtc_tm.tm_mon = simple_strtoul(p, &p, 10) - 1;
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+ if (*p++ != ':') goto err_out;
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+
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+ rtc_tm.tm_mday = simple_strtoul(p, &p, 10);
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+ if (*p++ != ':') goto err_out;
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+
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+ rtc_tm.tm_wday = simple_strtoul(p, &p, 10);
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+ if (*p++ != ':') goto err_out;
|
|
|
+
|
|
|
+ rtc_tm.tm_hour = simple_strtoul(p, &p, 10);
|
|
|
+ if (*p++ != ':') goto err_out;
|
|
|
+
|
|
|
+ rtc_tm.tm_min = simple_strtoul(p, &p, 10);
|
|
|
+ if (*p++ != ':') goto err_out;
|
|
|
+
|
|
|
+ rtc_tm.tm_sec = simple_strtoul(p, &p, 10);
|
|
|
+ if (*p != '\n') goto err_out;
|
|
|
+
|
|
|
+ rtc_tm.tm_year -= RTC_EPOCH;
|
|
|
+
|
|
|
+ set_rtc_time(&rtc_tm);
|
|
|
+
|
|
|
+ *ppos += count;
|
|
|
+
|
|
|
+ return count;
|
|
|
+
|
|
|
+ err_out:
|
|
|
+ printk(KERN_ERR "invalid format: use YYYY:MM:DD:W:HH:MM:SS\\n\n");
|
|
|
+ return -EINVAL;
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+static ssize_t rtc_read(UNUSED struct file *filp, char *buf, size_t count,
|
|
|
+ loff_t *ppos)
|
|
|
+{
|
|
|
+ char wbuf[23];
|
|
|
+ struct rtc_time tm;
|
|
|
+ ssize_t len;
|
|
|
+
|
|
|
+ if (count == 0 || *ppos != 0)
|
|
|
+ return 0;
|
|
|
+
|
|
|
+ get_rtc_time(&tm);
|
|
|
+
|
|
|
+ len = sprintf(wbuf, "%04d:%02d:%02d:%d:%02d:%02d:%02d\n",
|
|
|
+ tm.tm_year + RTC_EPOCH,
|
|
|
+ tm.tm_mon + 1,
|
|
|
+ tm.tm_mday,
|
|
|
+ tm.tm_wday,
|
|
|
+ tm.tm_hour,
|
|
|
+ tm.tm_min,
|
|
|
+ tm.tm_sec);
|
|
|
+
|
|
|
+ if (len > (ssize_t)count)
|
|
|
+ len = count;
|
|
|
+
|
|
|
+ if (copy_to_user(buf, wbuf, len))
|
|
|
+ return -EFAULT;
|
|
|
+
|
|
|
+ *ppos += len;
|
|
|
+
|
|
|
+ return len;
|
|
|
+}
|
|
|
+
|
|
|
+static int rtc_do_ioctl(unsigned int cmd, unsigned long arg)
|
|
|
+{
|
|
|
+ struct rtc_time rtc_tm;
|
|
|
+
|
|
|
+ switch (cmd) {
|
|
|
+ case RTC_RD_TIME:
|
|
|
+ memset(&rtc_tm, 0, sizeof(struct rtc_time));
|
|
|
+ get_rtc_time(&rtc_tm);
|
|
|
+ if (copy_to_user((void *)arg, &rtc_tm, sizeof(rtc_tm)))
|
|
|
+ return -EFAULT;
|
|
|
+ break;
|
|
|
+
|
|
|
+ case RTC_SET_TIME:
|
|
|
+ if (!capable(CAP_SYS_TIME))
|
|
|
+ return -EACCES;
|
|
|
+
|
|
|
+ if (copy_from_user(&rtc_tm, (struct rtc_time *)arg,
|
|
|
+ sizeof(struct rtc_time)))
|
|
|
+ return -EFAULT;
|
|
|
+
|
|
|
+ set_rtc_time(&rtc_tm);
|
|
|
+ break;
|
|
|
+
|
|
|
+ default:
|
|
|
+ return -ENOTTY;
|
|
|
+ }
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static long rtc_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
|
|
|
+{
|
|
|
+ long ret;
|
|
|
+ ret = rtc_do_ioctl(cmd, arg);
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+
|
|
|
+static const struct file_operations rtc_fops = {
|
|
|
+ .owner = THIS_MODULE,
|
|
|
+ .llseek = no_llseek,
|
|
|
+ .read = rtc_read,
|
|
|
+ .write = rtc_write,
|
|
|
+ .unlocked_ioctl = rtc_ioctl,
|
|
|
+ .open = rtc_open,
|
|
|
+ .release = rtc_release,
|
|
|
+};
|
|
|
+
|
|
|
+static struct miscdevice rtc_dev = {
|
|
|
+ .minor = RTC_MINOR,
|
|
|
+ .name = "rtc",
|
|
|
+ .fops = &rtc_fops,
|
|
|
+};
|
|
|
+
|
|
|
+/* Savagely ripped from diag.c. */
|
|
|
+static inline int startswith (char *source, char *cmp)
|
|
|
+{
|
|
|
+ return !strncmp(source, cmp, strlen(cmp));
|
|
|
+}
|
|
|
+
|
|
|
+static void platform_detect(void)
|
|
|
+{
|
|
|
+ char buf[20];
|
|
|
+ int et0phyaddr, et1phyaddr;
|
|
|
+
|
|
|
+ /* Based on "model_no". */
|
|
|
+ if (bcm47xx_nvram_getenv("model_no", buf, sizeof(buf)) >= 0) {
|
|
|
+ if (startswith(buf, "WL700")) { /* WL700* */
|
|
|
+ sda_index = 2;
|
|
|
+ scl_index = 5;
|
|
|
+ return;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ if (bcm47xx_nvram_getenv("et0phyaddr", buf, sizeof(buf)) >= 0 )
|
|
|
+ et0phyaddr = simple_strtoul(buf, NULL, 0);
|
|
|
+ if (bcm47xx_nvram_getenv("et1phyaddr", buf, sizeof(buf)) >= 0 )
|
|
|
+ et1phyaddr = simple_strtoul(buf, NULL, 0);
|
|
|
+
|
|
|
+ if (bcm47xx_nvram_getenv("hardware_version", buf, sizeof(buf)) >= 0) {
|
|
|
+ /* Either WL-300g or WL-HDD, do more extensive checks */
|
|
|
+ if (startswith(buf, "WL300-") && et0phyaddr == 0 && et1phyaddr == 1) {
|
|
|
+ sda_index = 4;
|
|
|
+ scl_index = 5;
|
|
|
+ return;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ /* not found */
|
|
|
+}
|
|
|
+
|
|
|
+static int __init rtc_init(void)
|
|
|
+{
|
|
|
+ int cr1;
|
|
|
+
|
|
|
+ platform_detect();
|
|
|
+
|
|
|
+ if (sda_index == scl_index) {
|
|
|
+ printk(KERN_ERR "RTC-RV5C386A: unrecognized platform!\n");
|
|
|
+ return -ENODEV;
|
|
|
+ }
|
|
|
+
|
|
|
+ i2c_init();
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Switch RTC to 24h mode
|
|
|
+ */
|
|
|
+ spin_lock_irq(&rtc_lock);
|
|
|
+ i2c_start();
|
|
|
+ i2c_outb(RTC_I2C_ADDRESS | I2C_WRITE_MASK);
|
|
|
+ i2c_outb(0xE4); /* start at address 0xE, transmission mode 4 */
|
|
|
+ cr1 = i2c_inb(I2C_NAK);
|
|
|
+ i2c_stop();
|
|
|
+ spin_unlock_irq(&rtc_lock);
|
|
|
+ if ((cr1 & RTC_24HOUR_MODE_MASK) == 0) {
|
|
|
+ /* RTC is running in 12h mode */
|
|
|
+ printk(KERN_INFO "rtc.o: switching to 24h mode\n");
|
|
|
+ spin_lock_irq(&rtc_lock);
|
|
|
+ i2c_start();
|
|
|
+ i2c_outb(RTC_I2C_ADDRESS | I2C_WRITE_MASK);
|
|
|
+ i2c_outb(0xE0);
|
|
|
+ i2c_outb(cr1 | RTC_24HOUR_MODE_MASK);
|
|
|
+ i2c_stop();
|
|
|
+ spin_unlock_irq(&rtc_lock);
|
|
|
+ }
|
|
|
+
|
|
|
+ misc_register(&rtc_dev);
|
|
|
+
|
|
|
+ printk(KERN_INFO "RV5C386A Real Time Clock Driver loaded\n");
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static void __exit rtc_exit (void)
|
|
|
+{
|
|
|
+ misc_deregister(&rtc_dev);
|
|
|
+ printk(KERN_INFO "Successfully removed RTC RV5C386A driver\n");
|
|
|
+}
|
|
|
+
|
|
|
+module_init(rtc_init);
|
|
|
+module_exit(rtc_exit);
|
|
|
+
|
|
|
+/*
|
|
|
+ * Local Variables:
|
|
|
+ * indent-tabs-mode:t
|
|
|
+ * c-basic-offset:8
|
|
|
+ * End:
|
|
|
+ */
|