mirror of
https://github.com/linux-thinkpad/tp_smapi.git
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516 lines
16 KiB
C
516 lines
16 KiB
C
/*
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* thinkpad_ec.c - ThinkPad embedded controller LPC3 functions
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*
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* The embedded controller on ThinkPad laptops has a non-standard interface,
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* where LPC channel 3 of the H8S EC chip is hooked up to IO ports
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* 0x1600-0x161F and implements (a special case of) the H8S LPC protocol.
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* The EC LPC interface provides various system management services (currently
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* known: battery information and accelerometer readouts). This driver
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* provides access and mutual exclusion for the EC interface.
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*
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* The LPC protocol and terminology are documented here:
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* "H8S/2104B Group Hardware Manual",
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* http://documentation.renesas.com/eng/products/mpumcu/rej09b0300_2140bhm.pdf
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*
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* Copyright (C) 2006-2007 Shem Multinymous <multinymous@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/dmi.h>
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#include <linux/ioport.h>
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#include <linux/delay.h>
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#include "thinkpad_ec.h"
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#include <linux/jiffies.h>
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#include <asm/io.h>
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#include <linux/version.h>
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#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,26)
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#include <asm/semaphore.h>
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#else
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#include <linux/semaphore.h>
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#endif
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#define TP_VERSION "0.44"
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MODULE_AUTHOR("Shem Multinymous");
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MODULE_DESCRIPTION("ThinkPad embedded controller hardware access");
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MODULE_VERSION(TP_VERSION);
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MODULE_LICENSE("GPL");
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/* IO ports used by embedded controller LPC channel 3: */
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#define TPC_BASE_PORT 0x1600
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#define TPC_NUM_PORTS 0x20
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#define TPC_STR3_PORT 0x1604 /* Reads H8S EC register STR3 */
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#define TPC_TWR0_PORT 0x1610 /* Mapped to H8S EC register TWR0MW/SW */
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#define TPC_TWR15_PORT 0x161F /* Mapped to H8S EC register TWR15. */
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/* (and port TPC_TWR0_PORT+i is mapped to H8S reg TWRi for 0<i<16) */
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/* H8S STR3 status flags (see "H8S/2104B Group Hardware Manual" p.549) */
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#define H8S_STR3_IBF3B 0x80 /* Bidi. Data Register Input Buffer Full */
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#define H8S_STR3_OBF3B 0x40 /* Bidi. Data Register Output Buffer Full */
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#define H8S_STR3_MWMF 0x20 /* Master Write Mode Flag */
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#define H8S_STR3_SWMF 0x10 /* Slave Write Mode Flag */
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#define H8S_STR3_MASK 0xF0 /* All bits we care about in STR3 */
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/* Timeouts and retries */
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#define TPC_READ_RETRIES 150
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#define TPC_READ_NDELAY 500
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#define TPC_REQUEST_RETRIES 1000
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#define TPC_REQUEST_NDELAY 10
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#define TPC_PREFETCH_TIMEOUT (HZ/10) /* invalidate prefetch after 0.1sec */
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/* A few macros for printk()ing: */
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#define MSG_FMT(fmt, args...) \
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"thinkpad_ec: %s: " fmt "\n", __func__, ## args
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#define REQ_FMT(msg, code) \
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MSG_FMT("%s: (0x%02x:0x%02x)->0x%02x", \
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msg, args->val[0x0], args->val[0xF], code)
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/* State of request prefetching: */
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static u8 prefetch_arg0, prefetch_argF; /* Args of last prefetch */
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static u64 prefetch_jiffies; /* time of prefetch, or: */
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#define TPC_PREFETCH_NONE INITIAL_JIFFIES /* No prefetch */
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#define TPC_PREFETCH_JUNK (INITIAL_JIFFIES+1) /* Ignore prefetch */
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/* Locking: */
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#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,37)
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static DECLARE_MUTEX(thinkpad_ec_mutex);
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#elif LINUX_VERSION_CODE < KERNEL_VERSION(6,4,0)
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static DEFINE_SEMAPHORE(thinkpad_ec_mutex);
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#else
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static DEFINE_SEMAPHORE(thinkpad_ec_mutex, 1);
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#endif
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/* Kludge in case the ACPI DSDT reserves the ports we need. */
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static bool force_io; /* Willing to do IO to ports we couldn't reserve? */
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static int reserved_io; /* Successfully reserved the ports? */
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module_param_named(force_io, force_io, bool, 0600);
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MODULE_PARM_DESC(force_io, "Force IO even if region already reserved (0=off, 1=on)");
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/**
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* thinkpad_ec_lock - get lock on the ThinkPad EC
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*
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* Get exclusive lock for accesing the ThinkPad embedded controller LPC3
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* interface. Returns 0 iff lock acquired.
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*/
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int thinkpad_ec_lock(void)
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{
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int ret;
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ret = down_interruptible(&thinkpad_ec_mutex);
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return ret;
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}
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EXPORT_SYMBOL_GPL(thinkpad_ec_lock);
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/**
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* thinkpad_ec_try_lock - try getting lock on the ThinkPad EC
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*
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* Try getting an exclusive lock for accesing the ThinkPad embedded
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* controller LPC3. Returns immediately if lock is not available; neither
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* blocks nor sleeps. Returns 0 iff lock acquired .
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*/
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int thinkpad_ec_try_lock(void)
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{
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return down_trylock(&thinkpad_ec_mutex);
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}
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EXPORT_SYMBOL_GPL(thinkpad_ec_try_lock);
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/**
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* thinkpad_ec_unlock - release lock on ThinkPad EC
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*
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* Release a previously acquired exclusive lock on the ThinkPad ebmedded
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* controller LPC3 interface.
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*/
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void thinkpad_ec_unlock(void)
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{
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up(&thinkpad_ec_mutex);
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}
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EXPORT_SYMBOL_GPL(thinkpad_ec_unlock);
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/**
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* thinkpad_ec_request_row - tell embedded controller to prepare a row
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* @args Input register arguments
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*
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* Requests a data row by writing to H8S LPC registers TRW0 through TWR15 (or
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* a subset thereof) following the protocol prescribed by the "H8S/2104B Group
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* Hardware Manual". Does sanity checks via status register STR3.
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*/
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static int thinkpad_ec_request_row(const struct thinkpad_ec_row *args)
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{
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u8 str3;
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int i;
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/* EC protocol requires write to TWR0 (function code): */
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if (!(args->mask & 0x0001)) {
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printk(KERN_ERR MSG_FMT("bad args->mask=0x%02x", args->mask));
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return -EINVAL;
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}
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/* Check initial STR3 status: */
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str3 = inb(TPC_STR3_PORT) & H8S_STR3_MASK;
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if (str3 & H8S_STR3_OBF3B) { /* data already pending */
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inb(TPC_TWR15_PORT); /* marks end of previous transaction */
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if (prefetch_jiffies == TPC_PREFETCH_NONE)
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printk(KERN_WARNING REQ_FMT(
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"EC has result from unrequested transaction",
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str3));
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return -EBUSY; /* EC will be ready in a few usecs */
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} else if (str3 == H8S_STR3_SWMF) { /* busy with previous request */
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if (prefetch_jiffies == TPC_PREFETCH_NONE)
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printk(KERN_WARNING REQ_FMT(
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"EC is busy with unrequested transaction",
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str3));
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return -EBUSY; /* data will be pending in a few usecs */
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} else if (str3 != 0x00) { /* unexpected status? */
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printk(KERN_WARNING REQ_FMT("unexpected initial STR3", str3));
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return -EIO;
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}
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/* Send TWR0MW: */
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outb(args->val[0], TPC_TWR0_PORT);
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str3 = inb(TPC_STR3_PORT) & H8S_STR3_MASK;
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if (str3 != H8S_STR3_MWMF) { /* not accepted? */
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printk(KERN_WARNING REQ_FMT("arg0 rejected", str3));
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return -EIO;
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}
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/* Send TWR1 through TWR14: */
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for (i = 1; i < TP_CONTROLLER_ROW_LEN-1; i++)
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if ((args->mask>>i)&1)
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outb(args->val[i], TPC_TWR0_PORT+i);
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/* Send TWR15 (default to 0x01). This marks end of command. */
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outb((args->mask & 0x8000) ? args->val[0xF] : 0x01, TPC_TWR15_PORT);
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/* Wait until EC starts writing its reply (~60ns on average).
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* Releasing locks before this happens may cause an EC hang
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* due to firmware bug!
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*/
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for (i = 0; i < TPC_REQUEST_RETRIES; i++) {
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str3 = inb(TPC_STR3_PORT) & H8S_STR3_MASK;
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if (str3 & H8S_STR3_SWMF) /* EC started replying */
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return 0;
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else if (!(str3 & ~(H8S_STR3_IBF3B|H8S_STR3_MWMF)))
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/* Normal progress (the EC hasn't seen the request
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* yet, or is processing it). Wait it out. */
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ndelay(TPC_REQUEST_NDELAY);
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else { /* weird EC status */
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printk(KERN_WARNING
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REQ_FMT("bad end STR3", str3));
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return -EIO;
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}
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}
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printk(KERN_WARNING REQ_FMT("EC is mysteriously silent", str3));
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return -EIO;
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}
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/**
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* thinkpad_ec_read_data - read pre-requested row-data from EC
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* @args Input register arguments of pre-requested rows
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* @data Output register values
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*
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* Reads current row data from the controller, assuming it's already
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* requested. Follows the H8S spec for register access and status checks.
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*/
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static int thinkpad_ec_read_data(const struct thinkpad_ec_row *args,
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struct thinkpad_ec_row *data)
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{
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int i;
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u8 str3 = inb(TPC_STR3_PORT) & H8S_STR3_MASK;
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/* Once we make a request, STR3 assumes the sequence of values listed
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* in the following 'if' as it reads the request and writes its data.
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* It takes about a few dozen nanosecs total, with very high variance.
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*/
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if (str3 == (H8S_STR3_IBF3B|H8S_STR3_MWMF) ||
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str3 == 0x00 || /* the 0x00 is indistinguishable from idle EC! */
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str3 == H8S_STR3_SWMF)
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return -EBUSY; /* not ready yet */
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/* Finally, the EC signals output buffer full: */
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if (str3 != (H8S_STR3_OBF3B|H8S_STR3_SWMF)) {
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printk(KERN_WARNING
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REQ_FMT("bad initial STR3", str3));
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return -EIO;
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}
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/* Read first byte (signals start of read transactions): */
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data->val[0] = inb(TPC_TWR0_PORT);
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/* Optionally read 14 more bytes: */
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for (i = 1; i < TP_CONTROLLER_ROW_LEN-1; i++)
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if ((data->mask >> i)&1)
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data->val[i] = inb(TPC_TWR0_PORT+i);
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/* Read last byte from 0x161F (signals end of read transaction): */
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data->val[0xF] = inb(TPC_TWR15_PORT);
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/* Readout still pending? */
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str3 = inb(TPC_STR3_PORT) & H8S_STR3_MASK;
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if (str3 & H8S_STR3_OBF3B)
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printk(KERN_WARNING
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REQ_FMT("OBF3B=1 after read", str3));
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/* If port 0x161F returns 0x80 too often, the EC may lock up. Warn: */
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if (data->val[0xF] == 0x80)
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printk(KERN_WARNING
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REQ_FMT("0x161F reports error", data->val[0xF]));
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return 0;
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}
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/**
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* thinkpad_ec_is_row_fetched - is the given row currently prefetched?
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*
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* To keep things simple we compare only the first and last args;
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* this suffices for all known cases.
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*/
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static int thinkpad_ec_is_row_fetched(const struct thinkpad_ec_row *args)
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{
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return (prefetch_jiffies != TPC_PREFETCH_NONE) &&
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(prefetch_jiffies != TPC_PREFETCH_JUNK) &&
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(prefetch_arg0 == args->val[0]) &&
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(prefetch_argF == args->val[0xF]) &&
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(get_jiffies_64() < prefetch_jiffies + TPC_PREFETCH_TIMEOUT);
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}
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/**
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* thinkpad_ec_read_row - request and read data from ThinkPad EC
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* @args Input register arguments
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* @data Output register values
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*
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* Read a data row from the ThinkPad embedded controller LPC3 interface.
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* Does fetching and retrying if needed. The row is specified by an
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* array of 16 bytes, some of which may be undefined (but the first is
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* mandatory). These bytes are given in @args->val[], where @args->val[i] is
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* used iff (@args->mask>>i)&1). The resulting row data is stored in
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* @data->val[], but is only guaranteed to be valid for indices corresponding
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* to set bit in @data->mask. That is, if @data->mask&(1<<i)==0 then
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* @data->val[i] is undefined.
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*
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* Returns -EBUSY on transient error and -EIO on abnormal condition.
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* Caller must hold controller lock.
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*/
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int thinkpad_ec_read_row(const struct thinkpad_ec_row *args,
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struct thinkpad_ec_row *data)
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{
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int retries, ret;
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if (thinkpad_ec_is_row_fetched(args))
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goto read_row; /* already requested */
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/* Request the row */
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for (retries = 0; retries < TPC_READ_RETRIES; ++retries) {
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ret = thinkpad_ec_request_row(args);
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if (!ret)
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goto read_row;
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if (ret != -EBUSY)
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break;
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ndelay(TPC_READ_NDELAY);
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}
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printk(KERN_ERR REQ_FMT("failed requesting row", ret));
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goto out;
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read_row:
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/* Read the row's data */
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for (retries = 0; retries < TPC_READ_RETRIES; ++retries) {
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ret = thinkpad_ec_read_data(args, data);
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if (!ret)
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goto out;
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if (ret != -EBUSY)
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break;
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ndelay(TPC_READ_NDELAY);
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}
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printk(KERN_ERR REQ_FMT("failed waiting for data", ret));
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out:
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prefetch_jiffies = TPC_PREFETCH_JUNK;
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return ret;
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}
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EXPORT_SYMBOL_GPL(thinkpad_ec_read_row);
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/**
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* thinkpad_ec_try_read_row - try reading prefetched data from ThinkPad EC
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* @args Input register arguments
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* @data Output register values
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*
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* Try reading a data row from the ThinkPad embedded controller LPC3
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* interface, if this raw was recently prefetched using
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* thinkpad_ec_prefetch_row(). Does not fetch, retry or block.
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* The parameters have the same meaning as in thinkpad_ec_read_row().
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*
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* Returns -EBUSY is data not ready and -ENODATA if row not prefetched.
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* Caller must hold controller lock.
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*/
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int thinkpad_ec_try_read_row(const struct thinkpad_ec_row *args,
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struct thinkpad_ec_row *data)
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{
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int ret;
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if (!thinkpad_ec_is_row_fetched(args)) {
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ret = -ENODATA;
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} else {
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ret = thinkpad_ec_read_data(args, data);
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if (!ret)
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prefetch_jiffies = TPC_PREFETCH_NONE; /* eaten up */
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}
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return ret;
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}
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EXPORT_SYMBOL_GPL(thinkpad_ec_try_read_row);
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/**
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* thinkpad_ec_prefetch_row - prefetch data from ThinkPad EC
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* @args Input register arguments
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*
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* Prefetch a data row from the ThinkPad embedded controller LCP3
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* interface. A subsequent call to thinkpad_ec_read_row() with the
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* same arguments will be faster, and a subsequent call to
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* thinkpad_ec_try_read_row() stands a good chance of succeeding if
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* done neither too soon nor too late. See
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* thinkpad_ec_read_row() for the meaning of @args.
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*
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* Returns -EBUSY on transient error and -EIO on abnormal condition.
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* Caller must hold controller lock.
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*/
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int thinkpad_ec_prefetch_row(const struct thinkpad_ec_row *args)
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{
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int ret;
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ret = thinkpad_ec_request_row(args);
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if (ret) {
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prefetch_jiffies = TPC_PREFETCH_JUNK;
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} else {
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prefetch_jiffies = get_jiffies_64();
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prefetch_arg0 = args->val[0x0];
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prefetch_argF = args->val[0xF];
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}
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return ret;
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}
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EXPORT_SYMBOL_GPL(thinkpad_ec_prefetch_row);
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/**
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* thinkpad_ec_invalidate - invalidate prefetched ThinkPad EC data
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*
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* Invalidate the data prefetched via thinkpad_ec_prefetch_row() from the
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* ThinkPad embedded controller LPC3 interface.
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* Must be called before unlocking by any code that accesses the controller
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* ports directly.
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*/
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void thinkpad_ec_invalidate(void)
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{
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prefetch_jiffies = TPC_PREFETCH_JUNK;
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}
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EXPORT_SYMBOL_GPL(thinkpad_ec_invalidate);
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/*** Checking for EC hardware ***/
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/**
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* thinkpad_ec_test - verify the EC is present and follows protocol
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*
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* Ensure the EC LPC3 channel really works on this machine by making
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* an EC request and seeing if the EC follows the documented H8S protocol.
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* The requested row just reads battery status, so it should be harmless to
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* access it (on a correct EC).
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* This test writes to IO ports, so execute only after checking DMI.
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*/
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static int __init thinkpad_ec_test(void)
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{
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int ret;
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const struct thinkpad_ec_row args = /* battery 0 basic status */
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{ .mask = 0x8001, .val = {0x01,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0x00} };
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struct thinkpad_ec_row data = { .mask = 0x0000 };
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ret = thinkpad_ec_lock();
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if (ret)
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return ret;
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ret = thinkpad_ec_read_row(&args, &data);
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thinkpad_ec_unlock();
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return ret;
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}
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/* Search all DMI device names of a given type for a substring */
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static int __init dmi_find_substring(int type, const char *substr)
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{
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const struct dmi_device *dev = NULL;
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while ((dev = dmi_find_device(type, NULL, dev))) {
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if (strstr(dev->name, substr))
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#define TP_DMI_MATCH(vendor,model) { \
|
|
.ident = vendor " " model, \
|
|
.matches = { \
|
|
DMI_MATCH(DMI_BOARD_VENDOR, vendor), \
|
|
DMI_MATCH(DMI_PRODUCT_VERSION, model) \
|
|
} \
|
|
}
|
|
|
|
/* Check DMI for existence of ThinkPad embedded controller */
|
|
static int __init check_dmi_for_ec(void)
|
|
{
|
|
/* A few old models that have a good EC but don't report it in DMI */
|
|
struct dmi_system_id tp_whitelist[] = {
|
|
TP_DMI_MATCH("IBM", "ThinkPad A30"),
|
|
TP_DMI_MATCH("IBM", "ThinkPad T23"),
|
|
TP_DMI_MATCH("IBM", "ThinkPad X24"),
|
|
TP_DMI_MATCH("LENOVO", "ThinkPad"),
|
|
{ .ident = NULL }
|
|
};
|
|
return dmi_find_substring(DMI_DEV_TYPE_OEM_STRING,
|
|
"IBM ThinkPad Embedded Controller") ||
|
|
dmi_check_system(tp_whitelist);
|
|
}
|
|
|
|
/*** Init and cleanup ***/
|
|
|
|
static int __init thinkpad_ec_init(void)
|
|
{
|
|
if (!check_dmi_for_ec()) {
|
|
printk(KERN_WARNING
|
|
"thinkpad_ec: no ThinkPad embedded controller!\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (request_region(TPC_BASE_PORT, TPC_NUM_PORTS, "thinkpad_ec")) {
|
|
reserved_io = 1;
|
|
} else {
|
|
printk(KERN_ERR "thinkpad_ec: cannot claim IO ports %#x-%#x... ",
|
|
TPC_BASE_PORT,
|
|
TPC_BASE_PORT + TPC_NUM_PORTS - 1);
|
|
if (force_io) {
|
|
printk("forcing use of unreserved IO ports.\n");
|
|
} else {
|
|
printk("consider using force_io=1.\n");
|
|
return -ENXIO;
|
|
}
|
|
}
|
|
prefetch_jiffies = TPC_PREFETCH_JUNK;
|
|
if (thinkpad_ec_test()) {
|
|
printk(KERN_ERR "thinkpad_ec: initial ec test failed\n");
|
|
if (reserved_io)
|
|
release_region(TPC_BASE_PORT, TPC_NUM_PORTS);
|
|
return -ENXIO;
|
|
}
|
|
printk(KERN_INFO "thinkpad_ec: thinkpad_ec " TP_VERSION " loaded.\n");
|
|
return 0;
|
|
}
|
|
|
|
static void __exit thinkpad_ec_exit(void)
|
|
{
|
|
if (reserved_io)
|
|
release_region(TPC_BASE_PORT, TPC_NUM_PORTS);
|
|
printk(KERN_INFO "thinkpad_ec: unloaded.\n");
|
|
}
|
|
|
|
module_init(thinkpad_ec_init);
|
|
module_exit(thinkpad_ec_exit);
|