![Lan Tianyu](/assets/img/avatar_default.png)
A USB port's position and connectability can't be identified on some boards via USB hub registers. ACPI _UPC and _PLD can help to resolve this issue and so it is necessary to bind USB with ACPI. This patch is to allow ACPI binding with USB-3.0 hub. Current ACPI only can bind one struct-device to one ACPI device node. This can not work with USB-3.0 hub, because the USB-3.0 hub has two logical devices. Each works for USB-2.0 and USB-3.0 devices. In the Linux USB subsystem, those two logical hubs are treated as two seperate devices that have two struct devices. But in the ACPI DSDT, these two logical hubs share one ACPI device node. So there is a requirement to bind multi struct-devices to one ACPI device node. This patch is to resolve such problem. Following is the ACPI device nodes' description under xhci hcd. Device (XHC) Device (RHUB) Device (HSP1) Device (HSP2) Device (HSP3) Device (HSP4) Device (SSP1) Device (SSP2) Device (SSP3) Device (SSP4) Topology in the Linux device XHC USB-2.0 logical hub USB-3.0 logical hub HSP1 SSP1 HSP2 SSP2 HSP3 SSP3 HSP4 SSP4 This patch also modifies the output of /proc/acpi/wakeup. One ACPI node can be associated with multiple devices: XHC S4 *enabled pci:0000:00:14.0 RHUB S0 disabled usb:usb1 disabled usb:usb2 Signed-off-by: Lan Tianyu <tianyu.lan@intel.com> Acked-by: Sarah Sharp <sarah.a.sharp@linux.intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
455 lines
11 KiB
C
455 lines
11 KiB
C
#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/export.h>
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#include <linux/suspend.h>
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#include <linux/bcd.h>
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#include <asm/uaccess.h>
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#include <acpi/acpi_bus.h>
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#include <acpi/acpi_drivers.h>
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#ifdef CONFIG_X86
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#include <linux/mc146818rtc.h>
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#endif
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#include "sleep.h"
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#define _COMPONENT ACPI_SYSTEM_COMPONENT
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/*
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* this file provides support for:
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* /proc/acpi/alarm
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* /proc/acpi/wakeup
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*/
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ACPI_MODULE_NAME("sleep")
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#if defined(CONFIG_RTC_DRV_CMOS) || defined(CONFIG_RTC_DRV_CMOS_MODULE) || !defined(CONFIG_X86)
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/* use /sys/class/rtc/rtcX/wakealarm instead; it's not ACPI-specific */
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#else
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#define HAVE_ACPI_LEGACY_ALARM
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#endif
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#ifdef HAVE_ACPI_LEGACY_ALARM
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static u32 cmos_bcd_read(int offset, int rtc_control);
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static int acpi_system_alarm_seq_show(struct seq_file *seq, void *offset)
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{
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u32 sec, min, hr;
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u32 day, mo, yr, cent = 0;
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u32 today = 0;
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unsigned char rtc_control = 0;
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unsigned long flags;
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spin_lock_irqsave(&rtc_lock, flags);
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rtc_control = CMOS_READ(RTC_CONTROL);
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sec = cmos_bcd_read(RTC_SECONDS_ALARM, rtc_control);
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min = cmos_bcd_read(RTC_MINUTES_ALARM, rtc_control);
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hr = cmos_bcd_read(RTC_HOURS_ALARM, rtc_control);
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/* If we ever get an FACP with proper values... */
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if (acpi_gbl_FADT.day_alarm) {
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/* ACPI spec: only low 6 its should be cared */
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day = CMOS_READ(acpi_gbl_FADT.day_alarm) & 0x3F;
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if (!(rtc_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD)
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day = bcd2bin(day);
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} else
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day = cmos_bcd_read(RTC_DAY_OF_MONTH, rtc_control);
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if (acpi_gbl_FADT.month_alarm)
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mo = cmos_bcd_read(acpi_gbl_FADT.month_alarm, rtc_control);
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else {
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mo = cmos_bcd_read(RTC_MONTH, rtc_control);
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today = cmos_bcd_read(RTC_DAY_OF_MONTH, rtc_control);
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}
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if (acpi_gbl_FADT.century)
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cent = cmos_bcd_read(acpi_gbl_FADT.century, rtc_control);
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yr = cmos_bcd_read(RTC_YEAR, rtc_control);
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spin_unlock_irqrestore(&rtc_lock, flags);
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/* we're trusting the FADT (see above) */
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if (!acpi_gbl_FADT.century)
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/* If we're not trusting the FADT, we should at least make it
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* right for _this_ century... ehm, what is _this_ century?
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*
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* TBD:
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* ASAP: find piece of code in the kernel, e.g. star tracker driver,
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* which we can trust to determine the century correctly. Atom
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* watch driver would be nice, too...
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*
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* if that has not happened, change for first release in 2050:
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* if (yr<50)
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* yr += 2100;
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* else
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* yr += 2000; // current line of code
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*
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* if that has not happened either, please do on 2099/12/31:23:59:59
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* s/2000/2100
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*
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*/
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yr += 2000;
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else
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yr += cent * 100;
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/*
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* Show correct dates for alarms up to a month into the future.
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* This solves issues for nearly all situations with the common
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* 30-day alarm clocks in PC hardware.
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*/
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if (day < today) {
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if (mo < 12) {
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mo += 1;
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} else {
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mo = 1;
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yr += 1;
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}
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}
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seq_printf(seq, "%4.4u-", yr);
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(mo > 12) ? seq_puts(seq, "**-") : seq_printf(seq, "%2.2u-", mo);
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(day > 31) ? seq_puts(seq, "** ") : seq_printf(seq, "%2.2u ", day);
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(hr > 23) ? seq_puts(seq, "**:") : seq_printf(seq, "%2.2u:", hr);
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(min > 59) ? seq_puts(seq, "**:") : seq_printf(seq, "%2.2u:", min);
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(sec > 59) ? seq_puts(seq, "**\n") : seq_printf(seq, "%2.2u\n", sec);
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return 0;
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}
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static int acpi_system_alarm_open_fs(struct inode *inode, struct file *file)
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{
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return single_open(file, acpi_system_alarm_seq_show, PDE(inode)->data);
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}
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static int get_date_field(char **p, u32 * value)
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{
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char *next = NULL;
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char *string_end = NULL;
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int result = -EINVAL;
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/*
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* Try to find delimeter, only to insert null. The end of the
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* string won't have one, but is still valid.
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*/
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if (*p == NULL)
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return result;
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next = strpbrk(*p, "- :");
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if (next)
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*next++ = '\0';
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*value = simple_strtoul(*p, &string_end, 10);
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/* Signal success if we got a good digit */
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if (string_end != *p)
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result = 0;
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if (next)
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*p = next;
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else
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*p = NULL;
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return result;
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}
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/* Read a possibly BCD register, always return binary */
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static u32 cmos_bcd_read(int offset, int rtc_control)
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{
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u32 val = CMOS_READ(offset);
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if (!(rtc_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD)
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val = bcd2bin(val);
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return val;
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}
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/* Write binary value into possibly BCD register */
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static void cmos_bcd_write(u32 val, int offset, int rtc_control)
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{
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if (!(rtc_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD)
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val = bin2bcd(val);
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CMOS_WRITE(val, offset);
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}
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static ssize_t
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acpi_system_write_alarm(struct file *file,
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const char __user * buffer, size_t count, loff_t * ppos)
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{
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int result = 0;
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char alarm_string[30] = { '\0' };
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char *p = alarm_string;
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u32 sec, min, hr, day, mo, yr;
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int adjust = 0;
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unsigned char rtc_control = 0;
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if (count > sizeof(alarm_string) - 1)
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return -EINVAL;
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if (copy_from_user(alarm_string, buffer, count))
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return -EFAULT;
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alarm_string[count] = '\0';
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/* check for time adjustment */
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if (alarm_string[0] == '+') {
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p++;
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adjust = 1;
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}
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if ((result = get_date_field(&p, &yr)))
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goto end;
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if ((result = get_date_field(&p, &mo)))
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goto end;
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if ((result = get_date_field(&p, &day)))
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goto end;
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if ((result = get_date_field(&p, &hr)))
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goto end;
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if ((result = get_date_field(&p, &min)))
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goto end;
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if ((result = get_date_field(&p, &sec)))
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goto end;
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spin_lock_irq(&rtc_lock);
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rtc_control = CMOS_READ(RTC_CONTROL);
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if (adjust) {
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yr += cmos_bcd_read(RTC_YEAR, rtc_control);
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mo += cmos_bcd_read(RTC_MONTH, rtc_control);
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day += cmos_bcd_read(RTC_DAY_OF_MONTH, rtc_control);
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hr += cmos_bcd_read(RTC_HOURS, rtc_control);
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min += cmos_bcd_read(RTC_MINUTES, rtc_control);
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sec += cmos_bcd_read(RTC_SECONDS, rtc_control);
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}
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spin_unlock_irq(&rtc_lock);
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if (sec > 59) {
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min += sec/60;
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sec = sec%60;
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}
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if (min > 59) {
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hr += min/60;
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min = min%60;
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}
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if (hr > 23) {
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day += hr/24;
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hr = hr%24;
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}
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if (day > 31) {
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mo += day/32;
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day = day%32;
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}
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if (mo > 12) {
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yr += mo/13;
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mo = mo%13;
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}
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spin_lock_irq(&rtc_lock);
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/*
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* Disable alarm interrupt before setting alarm timer or else
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* when ACPI_EVENT_RTC is enabled, a spurious ACPI interrupt occurs
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*/
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rtc_control &= ~RTC_AIE;
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CMOS_WRITE(rtc_control, RTC_CONTROL);
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CMOS_READ(RTC_INTR_FLAGS);
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/* write the fields the rtc knows about */
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cmos_bcd_write(hr, RTC_HOURS_ALARM, rtc_control);
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cmos_bcd_write(min, RTC_MINUTES_ALARM, rtc_control);
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cmos_bcd_write(sec, RTC_SECONDS_ALARM, rtc_control);
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/*
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* If the system supports an enhanced alarm it will have non-zero
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* offsets into the CMOS RAM here -- which for some reason are pointing
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* to the RTC area of memory.
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*/
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if (acpi_gbl_FADT.day_alarm)
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cmos_bcd_write(day, acpi_gbl_FADT.day_alarm, rtc_control);
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if (acpi_gbl_FADT.month_alarm)
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cmos_bcd_write(mo, acpi_gbl_FADT.month_alarm, rtc_control);
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if (acpi_gbl_FADT.century) {
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if (adjust)
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yr += cmos_bcd_read(acpi_gbl_FADT.century, rtc_control) * 100;
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cmos_bcd_write(yr / 100, acpi_gbl_FADT.century, rtc_control);
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}
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/* enable the rtc alarm interrupt */
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rtc_control |= RTC_AIE;
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CMOS_WRITE(rtc_control, RTC_CONTROL);
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CMOS_READ(RTC_INTR_FLAGS);
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spin_unlock_irq(&rtc_lock);
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acpi_clear_event(ACPI_EVENT_RTC);
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acpi_enable_event(ACPI_EVENT_RTC, 0);
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*ppos += count;
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result = 0;
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end:
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return result ? result : count;
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}
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#endif /* HAVE_ACPI_LEGACY_ALARM */
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static int
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acpi_system_wakeup_device_seq_show(struct seq_file *seq, void *offset)
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{
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struct list_head *node, *next;
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seq_printf(seq, "Device\tS-state\t Status Sysfs node\n");
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mutex_lock(&acpi_device_lock);
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list_for_each_safe(node, next, &acpi_wakeup_device_list) {
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struct acpi_device *dev =
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container_of(node, struct acpi_device, wakeup_list);
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struct acpi_device_physical_node *entry;
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if (!dev->wakeup.flags.valid)
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continue;
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seq_printf(seq, "%s\t S%d\t",
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dev->pnp.bus_id,
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(u32) dev->wakeup.sleep_state);
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if (!dev->physical_node_count)
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seq_printf(seq, "%c%-8s\n",
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dev->wakeup.flags.run_wake ?
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'*' : ' ', "disabled");
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else {
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struct device *ldev;
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list_for_each_entry(entry, &dev->physical_node_list,
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node) {
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ldev = get_device(entry->dev);
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if (!ldev)
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continue;
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if (&entry->node !=
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dev->physical_node_list.next)
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seq_printf(seq, "\t\t");
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seq_printf(seq, "%c%-8s %s:%s\n",
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dev->wakeup.flags.run_wake ? '*' : ' ',
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(device_may_wakeup(&dev->dev) ||
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(ldev && device_may_wakeup(ldev))) ?
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"enabled" : "disabled",
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ldev->bus ? ldev->bus->name :
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"no-bus", dev_name(ldev));
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put_device(ldev);
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}
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}
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}
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mutex_unlock(&acpi_device_lock);
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return 0;
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}
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static void physical_device_enable_wakeup(struct acpi_device *adev)
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{
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struct acpi_device_physical_node *entry;
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list_for_each_entry(entry,
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&adev->physical_node_list, node)
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if (entry->dev && device_can_wakeup(entry->dev)) {
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bool enable = !device_may_wakeup(entry->dev);
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device_set_wakeup_enable(entry->dev, enable);
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}
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}
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static ssize_t
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acpi_system_write_wakeup_device(struct file *file,
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const char __user * buffer,
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size_t count, loff_t * ppos)
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{
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struct list_head *node, *next;
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char strbuf[5];
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char str[5] = "";
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unsigned int len = count;
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if (len > 4)
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len = 4;
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if (len < 0)
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return -EFAULT;
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if (copy_from_user(strbuf, buffer, len))
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return -EFAULT;
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strbuf[len] = '\0';
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sscanf(strbuf, "%s", str);
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mutex_lock(&acpi_device_lock);
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list_for_each_safe(node, next, &acpi_wakeup_device_list) {
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struct acpi_device *dev =
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container_of(node, struct acpi_device, wakeup_list);
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if (!dev->wakeup.flags.valid)
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continue;
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if (!strncmp(dev->pnp.bus_id, str, 4)) {
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if (device_can_wakeup(&dev->dev)) {
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bool enable = !device_may_wakeup(&dev->dev);
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device_set_wakeup_enable(&dev->dev, enable);
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} else {
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physical_device_enable_wakeup(dev);
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}
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break;
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}
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}
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mutex_unlock(&acpi_device_lock);
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return count;
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}
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static int
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acpi_system_wakeup_device_open_fs(struct inode *inode, struct file *file)
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{
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return single_open(file, acpi_system_wakeup_device_seq_show,
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PDE(inode)->data);
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}
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static const struct file_operations acpi_system_wakeup_device_fops = {
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.owner = THIS_MODULE,
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.open = acpi_system_wakeup_device_open_fs,
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.read = seq_read,
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.write = acpi_system_write_wakeup_device,
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.llseek = seq_lseek,
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.release = single_release,
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};
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#ifdef HAVE_ACPI_LEGACY_ALARM
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static const struct file_operations acpi_system_alarm_fops = {
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.owner = THIS_MODULE,
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.open = acpi_system_alarm_open_fs,
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.read = seq_read,
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.write = acpi_system_write_alarm,
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.llseek = seq_lseek,
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.release = single_release,
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};
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static u32 rtc_handler(void *context)
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{
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acpi_clear_event(ACPI_EVENT_RTC);
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acpi_disable_event(ACPI_EVENT_RTC, 0);
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return ACPI_INTERRUPT_HANDLED;
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}
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#endif /* HAVE_ACPI_LEGACY_ALARM */
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int __init acpi_sleep_proc_init(void)
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{
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#ifdef HAVE_ACPI_LEGACY_ALARM
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/* 'alarm' [R/W] */
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proc_create("alarm", S_IFREG | S_IRUGO | S_IWUSR,
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acpi_root_dir, &acpi_system_alarm_fops);
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acpi_install_fixed_event_handler(ACPI_EVENT_RTC, rtc_handler, NULL);
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/*
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* Disable the RTC event after installing RTC handler.
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* Only when RTC alarm is set will it be enabled.
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*/
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acpi_clear_event(ACPI_EVENT_RTC);
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acpi_disable_event(ACPI_EVENT_RTC, 0);
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#endif /* HAVE_ACPI_LEGACY_ALARM */
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/* 'wakeup device' [R/W] */
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proc_create("wakeup", S_IFREG | S_IRUGO | S_IWUSR,
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acpi_root_dir, &acpi_system_wakeup_device_fops);
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return 0;
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}
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