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1025 lines
25 KiB
1025 lines
25 KiB
/* |
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* HIL MLC state machine and serio interface driver |
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* |
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* Copyright (c) 2001 Brian S. Julin |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions, and the following disclaimer, |
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* without modification. |
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* 2. The name of the author may not be used to endorse or promote products |
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* derived from this software without specific prior written permission. |
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* |
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* Alternatively, this software may be distributed under the terms of the |
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* GNU General Public License ("GPL"). |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR |
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* |
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* References: |
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* HP-HIL Technical Reference Manual. Hewlett Packard Product No. 45918A |
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* |
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* |
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* Driver theory of operation: |
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* |
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* Some access methods and an ISR is defined by the sub-driver |
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* (e.g. hp_sdc_mlc.c). These methods are expected to provide a |
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* few bits of logic in addition to raw access to the HIL MLC, |
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* specifically, the ISR, which is entirely registered by the |
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* sub-driver and invoked directly, must check for record |
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* termination or packet match, at which point a semaphore must |
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* be cleared and then the hil_mlcs_tasklet must be scheduled. |
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* |
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* The hil_mlcs_tasklet processes the state machine for all MLCs |
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* each time it runs, checking each MLC's progress at the current |
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* node in the state machine, and moving the MLC to subsequent nodes |
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* in the state machine when appropriate. It will reschedule |
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* itself if output is pending. (This rescheduling should be replaced |
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* at some point with a sub-driver-specific mechanism.) |
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* |
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* A timer task prods the tasklet once per second to prevent |
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* hangups when attached devices do not return expected data |
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* and to initiate probes of the loop for new devices. |
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*/ |
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|
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#include <linux/hil_mlc.h> |
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#include <linux/errno.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/init.h> |
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#include <linux/interrupt.h> |
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#include <linux/slab.h> |
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#include <linux/timer.h> |
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#include <linux/list.h> |
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MODULE_AUTHOR("Brian S. Julin <[email protected]>"); |
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MODULE_DESCRIPTION("HIL MLC serio"); |
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MODULE_LICENSE("Dual BSD/GPL"); |
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EXPORT_SYMBOL(hil_mlc_register); |
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EXPORT_SYMBOL(hil_mlc_unregister); |
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#define PREFIX "HIL MLC: " |
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static LIST_HEAD(hil_mlcs); |
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static DEFINE_RWLOCK(hil_mlcs_lock); |
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static struct timer_list hil_mlcs_kicker; |
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static int hil_mlcs_probe, hil_mlc_stop; |
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|
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static void hil_mlcs_process(unsigned long unused); |
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static DECLARE_TASKLET_DISABLED_OLD(hil_mlcs_tasklet, hil_mlcs_process); |
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/* #define HIL_MLC_DEBUG */ |
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|
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/********************** Device info/instance management **********************/ |
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static void hil_mlc_clear_di_map(hil_mlc *mlc, int val) |
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{ |
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int j; |
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for (j = val; j < 7 ; j++) |
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mlc->di_map[j] = -1; |
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} |
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static void hil_mlc_clear_di_scratch(hil_mlc *mlc) |
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{ |
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memset(&mlc->di_scratch, 0, sizeof(mlc->di_scratch)); |
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} |
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static void hil_mlc_copy_di_scratch(hil_mlc *mlc, int idx) |
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{ |
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memcpy(&mlc->di[idx], &mlc->di_scratch, sizeof(mlc->di_scratch)); |
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} |
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static int hil_mlc_match_di_scratch(hil_mlc *mlc) |
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{ |
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int idx; |
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|
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for (idx = 0; idx < HIL_MLC_DEVMEM; idx++) { |
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int j, found = 0; |
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|
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/* In-use slots are not eligible. */ |
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for (j = 0; j < 7 ; j++) |
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if (mlc->di_map[j] == idx) |
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found++; |
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if (found) |
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continue; |
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|
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if (!memcmp(mlc->di + idx, &mlc->di_scratch, |
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sizeof(mlc->di_scratch))) |
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break; |
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} |
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return idx >= HIL_MLC_DEVMEM ? -1 : idx; |
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} |
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static int hil_mlc_find_free_di(hil_mlc *mlc) |
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{ |
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int idx; |
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|
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/* TODO: Pick all-zero slots first, failing that, |
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* randomize the slot picked among those eligible. |
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*/ |
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for (idx = 0; idx < HIL_MLC_DEVMEM; idx++) { |
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int j, found = 0; |
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for (j = 0; j < 7 ; j++) |
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if (mlc->di_map[j] == idx) |
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found++; |
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if (!found) |
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break; |
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} |
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return idx; /* Note: It is guaranteed at least one above will match */ |
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} |
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static inline void hil_mlc_clean_serio_map(hil_mlc *mlc) |
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{ |
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int idx; |
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for (idx = 0; idx < HIL_MLC_DEVMEM; idx++) { |
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int j, found = 0; |
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for (j = 0; j < 7 ; j++) |
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if (mlc->di_map[j] == idx) |
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found++; |
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if (!found) |
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mlc->serio_map[idx].di_revmap = -1; |
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} |
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} |
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static void hil_mlc_send_polls(hil_mlc *mlc) |
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{ |
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int did, i, cnt; |
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struct serio *serio; |
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struct serio_driver *drv; |
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i = cnt = 0; |
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did = (mlc->ipacket[0] & HIL_PKT_ADDR_MASK) >> 8; |
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serio = did ? mlc->serio[mlc->di_map[did - 1]] : NULL; |
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drv = (serio != NULL) ? serio->drv : NULL; |
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while (mlc->icount < 15 - i) { |
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hil_packet p; |
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p = mlc->ipacket[i]; |
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if (did != (p & HIL_PKT_ADDR_MASK) >> 8) { |
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if (drv && drv->interrupt) { |
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drv->interrupt(serio, 0, 0); |
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drv->interrupt(serio, HIL_ERR_INT >> 16, 0); |
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drv->interrupt(serio, HIL_PKT_CMD >> 8, 0); |
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drv->interrupt(serio, HIL_CMD_POL + cnt, 0); |
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} |
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did = (p & HIL_PKT_ADDR_MASK) >> 8; |
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serio = did ? mlc->serio[mlc->di_map[did-1]] : NULL; |
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drv = (serio != NULL) ? serio->drv : NULL; |
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cnt = 0; |
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} |
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cnt++; |
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i++; |
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if (drv && drv->interrupt) { |
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drv->interrupt(serio, (p >> 24), 0); |
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drv->interrupt(serio, (p >> 16) & 0xff, 0); |
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drv->interrupt(serio, (p >> 8) & ~HIL_PKT_ADDR_MASK, 0); |
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drv->interrupt(serio, p & 0xff, 0); |
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} |
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} |
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} |
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/*************************** State engine *********************************/ |
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#define HILSEN_SCHED 0x000100 /* Schedule the tasklet */ |
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#define HILSEN_BREAK 0x000200 /* Wait until next pass */ |
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#define HILSEN_UP 0x000400 /* relative node#, decrement */ |
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#define HILSEN_DOWN 0x000800 /* relative node#, increment */ |
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#define HILSEN_FOLLOW 0x001000 /* use retval as next node# */ |
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#define HILSEN_MASK 0x0000ff |
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#define HILSEN_START 0 |
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#define HILSEN_RESTART 1 |
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#define HILSEN_DHR 9 |
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#define HILSEN_DHR2 10 |
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#define HILSEN_IFC 14 |
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#define HILSEN_HEAL0 16 |
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#define HILSEN_HEAL 18 |
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#define HILSEN_ACF 21 |
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#define HILSEN_ACF2 22 |
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#define HILSEN_DISC0 25 |
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#define HILSEN_DISC 27 |
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#define HILSEN_MATCH 40 |
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#define HILSEN_OPERATE 41 |
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#define HILSEN_PROBE 44 |
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#define HILSEN_DSR 52 |
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#define HILSEN_REPOLL 55 |
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#define HILSEN_IFCACF 58 |
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#define HILSEN_END 60 |
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#define HILSEN_NEXT (HILSEN_DOWN | 1) |
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#define HILSEN_SAME (HILSEN_DOWN | 0) |
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#define HILSEN_LAST (HILSEN_UP | 1) |
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#define HILSEN_DOZE (HILSEN_SAME | HILSEN_SCHED | HILSEN_BREAK) |
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#define HILSEN_SLEEP (HILSEN_SAME | HILSEN_BREAK) |
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static int hilse_match(hil_mlc *mlc, int unused) |
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{ |
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int rc; |
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rc = hil_mlc_match_di_scratch(mlc); |
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if (rc == -1) { |
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rc = hil_mlc_find_free_di(mlc); |
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if (rc == -1) |
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goto err; |
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#ifdef HIL_MLC_DEBUG |
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printk(KERN_DEBUG PREFIX "new in slot %i\n", rc); |
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#endif |
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hil_mlc_copy_di_scratch(mlc, rc); |
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mlc->di_map[mlc->ddi] = rc; |
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mlc->serio_map[rc].di_revmap = mlc->ddi; |
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hil_mlc_clean_serio_map(mlc); |
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serio_rescan(mlc->serio[rc]); |
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return -1; |
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} |
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mlc->di_map[mlc->ddi] = rc; |
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#ifdef HIL_MLC_DEBUG |
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printk(KERN_DEBUG PREFIX "same in slot %i\n", rc); |
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#endif |
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mlc->serio_map[rc].di_revmap = mlc->ddi; |
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hil_mlc_clean_serio_map(mlc); |
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return 0; |
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err: |
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printk(KERN_ERR PREFIX "Residual device slots exhausted, close some serios!\n"); |
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return 1; |
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} |
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/* An LCV used to prevent runaway loops, forces 5 second sleep when reset. */ |
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static int hilse_init_lcv(hil_mlc *mlc, int unused) |
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{ |
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time64_t now = ktime_get_seconds(); |
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if (mlc->lcv && (now - mlc->lcv_time) < 5) |
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return -1; |
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mlc->lcv_time = now; |
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mlc->lcv = 0; |
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return 0; |
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} |
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static int hilse_inc_lcv(hil_mlc *mlc, int lim) |
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{ |
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return mlc->lcv++ >= lim ? -1 : 0; |
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} |
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#if 0 |
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static int hilse_set_lcv(hil_mlc *mlc, int val) |
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{ |
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mlc->lcv = val; |
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return 0; |
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} |
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#endif |
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/* Management of the discovered device index (zero based, -1 means no devs) */ |
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static int hilse_set_ddi(hil_mlc *mlc, int val) |
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{ |
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mlc->ddi = val; |
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hil_mlc_clear_di_map(mlc, val + 1); |
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return 0; |
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} |
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static int hilse_dec_ddi(hil_mlc *mlc, int unused) |
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{ |
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mlc->ddi--; |
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if (mlc->ddi <= -1) { |
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mlc->ddi = -1; |
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hil_mlc_clear_di_map(mlc, 0); |
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return -1; |
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} |
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hil_mlc_clear_di_map(mlc, mlc->ddi + 1); |
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return 0; |
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} |
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static int hilse_inc_ddi(hil_mlc *mlc, int unused) |
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{ |
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BUG_ON(mlc->ddi >= 6); |
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mlc->ddi++; |
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return 0; |
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} |
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static int hilse_take_idd(hil_mlc *mlc, int unused) |
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{ |
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int i; |
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/* Help the state engine: |
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* Is this a real IDD response or just an echo? |
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* |
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* Real IDD response does not start with a command. |
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*/ |
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if (mlc->ipacket[0] & HIL_PKT_CMD) |
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goto bail; |
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/* Should have the command echoed further down. */ |
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for (i = 1; i < 16; i++) { |
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if (((mlc->ipacket[i] & HIL_PKT_ADDR_MASK) == |
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(mlc->ipacket[0] & HIL_PKT_ADDR_MASK)) && |
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(mlc->ipacket[i] & HIL_PKT_CMD) && |
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((mlc->ipacket[i] & HIL_PKT_DATA_MASK) == HIL_CMD_IDD)) |
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break; |
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} |
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if (i > 15) |
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goto bail; |
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/* And the rest of the packets should still be clear. */ |
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while (++i < 16) |
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if (mlc->ipacket[i]) |
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break; |
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if (i < 16) |
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goto bail; |
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for (i = 0; i < 16; i++) |
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mlc->di_scratch.idd[i] = |
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mlc->ipacket[i] & HIL_PKT_DATA_MASK; |
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/* Next step is to see if RSC supported */ |
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if (mlc->di_scratch.idd[1] & HIL_IDD_HEADER_RSC) |
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return HILSEN_NEXT; |
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if (mlc->di_scratch.idd[1] & HIL_IDD_HEADER_EXD) |
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return HILSEN_DOWN | 4; |
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return 0; |
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bail: |
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mlc->ddi--; |
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|
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return -1; /* This should send us off to ACF */ |
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} |
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static int hilse_take_rsc(hil_mlc *mlc, int unused) |
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{ |
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int i; |
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for (i = 0; i < 16; i++) |
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mlc->di_scratch.rsc[i] = |
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mlc->ipacket[i] & HIL_PKT_DATA_MASK; |
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|
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/* Next step is to see if EXD supported (IDD has already been read) */ |
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if (mlc->di_scratch.idd[1] & HIL_IDD_HEADER_EXD) |
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return HILSEN_NEXT; |
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return 0; |
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} |
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static int hilse_take_exd(hil_mlc *mlc, int unused) |
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{ |
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int i; |
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for (i = 0; i < 16; i++) |
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mlc->di_scratch.exd[i] = |
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mlc->ipacket[i] & HIL_PKT_DATA_MASK; |
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/* Next step is to see if RNM supported. */ |
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if (mlc->di_scratch.exd[0] & HIL_EXD_HEADER_RNM) |
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return HILSEN_NEXT; |
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return 0; |
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} |
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static int hilse_take_rnm(hil_mlc *mlc, int unused) |
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{ |
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int i; |
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for (i = 0; i < 16; i++) |
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mlc->di_scratch.rnm[i] = |
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mlc->ipacket[i] & HIL_PKT_DATA_MASK; |
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printk(KERN_INFO PREFIX "Device name gotten: %16s\n", |
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mlc->di_scratch.rnm); |
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return 0; |
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} |
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static int hilse_operate(hil_mlc *mlc, int repoll) |
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{ |
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|
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if (mlc->opercnt == 0) |
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hil_mlcs_probe = 0; |
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mlc->opercnt = 1; |
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hil_mlc_send_polls(mlc); |
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if (!hil_mlcs_probe) |
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return 0; |
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hil_mlcs_probe = 0; |
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mlc->opercnt = 0; |
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return 1; |
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} |
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#define FUNC(funct, funct_arg, zero_rc, neg_rc, pos_rc) \ |
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{ HILSE_FUNC, { .func = funct }, funct_arg, zero_rc, neg_rc, pos_rc }, |
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#define OUT(pack) \ |
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{ HILSE_OUT, { .packet = pack }, 0, HILSEN_NEXT, HILSEN_DOZE, 0 }, |
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#define CTS \ |
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{ HILSE_CTS, { .packet = 0 }, 0, HILSEN_NEXT | HILSEN_SCHED | HILSEN_BREAK, HILSEN_DOZE, 0 }, |
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#define EXPECT(comp, to, got, got_wrong, timed_out) \ |
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{ HILSE_EXPECT, { .packet = comp }, to, got, got_wrong, timed_out }, |
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#define EXPECT_LAST(comp, to, got, got_wrong, timed_out) \ |
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{ HILSE_EXPECT_LAST, { .packet = comp }, to, got, got_wrong, timed_out }, |
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#define EXPECT_DISC(comp, to, got, got_wrong, timed_out) \ |
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{ HILSE_EXPECT_DISC, { .packet = comp }, to, got, got_wrong, timed_out }, |
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#define IN(to, got, got_error, timed_out) \ |
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{ HILSE_IN, { .packet = 0 }, to, got, got_error, timed_out }, |
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#define OUT_DISC(pack) \ |
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{ HILSE_OUT_DISC, { .packet = pack }, 0, 0, 0, 0 }, |
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#define OUT_LAST(pack) \ |
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{ HILSE_OUT_LAST, { .packet = pack }, 0, 0, 0, 0 }, |
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|
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static const struct hilse_node hil_mlc_se[HILSEN_END] = { |
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|
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/* 0 HILSEN_START */ |
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FUNC(hilse_init_lcv, 0, HILSEN_NEXT, HILSEN_SLEEP, 0) |
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|
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/* 1 HILSEN_RESTART */ |
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FUNC(hilse_inc_lcv, 10, HILSEN_NEXT, HILSEN_START, 0) |
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OUT(HIL_CTRL_ONLY) /* Disable APE */ |
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CTS |
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#define TEST_PACKET(x) \ |
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(HIL_PKT_CMD | (x << HIL_PKT_ADDR_SHIFT) | x << 4 | x) |
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|
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OUT(HIL_DO_ALTER_CTRL | HIL_CTRL_TEST | TEST_PACKET(0x5)) |
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EXPECT(HIL_ERR_INT | TEST_PACKET(0x5), |
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2000, HILSEN_NEXT, HILSEN_RESTART, HILSEN_RESTART) |
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OUT(HIL_DO_ALTER_CTRL | HIL_CTRL_TEST | TEST_PACKET(0xa)) |
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EXPECT(HIL_ERR_INT | TEST_PACKET(0xa), |
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2000, HILSEN_NEXT, HILSEN_RESTART, HILSEN_RESTART) |
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OUT(HIL_CTRL_ONLY | 0) /* Disable test mode */ |
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|
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/* 9 HILSEN_DHR */ |
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FUNC(hilse_init_lcv, 0, HILSEN_NEXT, HILSEN_SLEEP, 0) |
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|
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/* 10 HILSEN_DHR2 */ |
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FUNC(hilse_inc_lcv, 10, HILSEN_NEXT, HILSEN_START, 0) |
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FUNC(hilse_set_ddi, -1, HILSEN_NEXT, 0, 0) |
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OUT(HIL_PKT_CMD | HIL_CMD_DHR) |
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IN(300000, HILSEN_DHR2, HILSEN_DHR2, HILSEN_NEXT) |
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|
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/* 14 HILSEN_IFC */ |
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OUT(HIL_PKT_CMD | HIL_CMD_IFC) |
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EXPECT(HIL_PKT_CMD | HIL_CMD_IFC | HIL_ERR_INT, |
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20000, HILSEN_DISC, HILSEN_DHR2, HILSEN_NEXT ) |
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|
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/* If devices are there, they weren't in PUP or other loopback mode. |
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* We're more concerned at this point with restoring operation |
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* to devices than discovering new ones, so we try to salvage |
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* the loop configuration by closing off the loop. |
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*/ |
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|
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/* 16 HILSEN_HEAL0 */ |
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FUNC(hilse_dec_ddi, 0, HILSEN_NEXT, HILSEN_ACF, 0) |
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FUNC(hilse_inc_ddi, 0, HILSEN_NEXT, 0, 0) |
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|
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/* 18 HILSEN_HEAL */ |
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OUT_LAST(HIL_CMD_ELB) |
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EXPECT_LAST(HIL_CMD_ELB | HIL_ERR_INT, |
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20000, HILSEN_REPOLL, HILSEN_DSR, HILSEN_NEXT) |
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FUNC(hilse_dec_ddi, 0, HILSEN_HEAL, HILSEN_NEXT, 0) |
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|
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/* 21 HILSEN_ACF */ |
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FUNC(hilse_init_lcv, 0, HILSEN_NEXT, HILSEN_DOZE, 0) |
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|
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/* 22 HILSEN_ACF2 */ |
|
FUNC(hilse_inc_lcv, 10, HILSEN_NEXT, HILSEN_START, 0) |
|
OUT(HIL_PKT_CMD | HIL_CMD_ACF | 1) |
|
IN(20000, HILSEN_NEXT, HILSEN_DSR, HILSEN_NEXT) |
|
|
|
/* 25 HILSEN_DISC0 */ |
|
OUT_DISC(HIL_PKT_CMD | HIL_CMD_ELB) |
|
EXPECT_DISC(HIL_PKT_CMD | HIL_CMD_ELB | HIL_ERR_INT, |
|
20000, HILSEN_NEXT, HILSEN_DSR, HILSEN_DSR) |
|
|
|
/* Only enter here if response just received */ |
|
/* 27 HILSEN_DISC */ |
|
OUT_DISC(HIL_PKT_CMD | HIL_CMD_IDD) |
|
EXPECT_DISC(HIL_PKT_CMD | HIL_CMD_IDD | HIL_ERR_INT, |
|
20000, HILSEN_NEXT, HILSEN_DSR, HILSEN_START) |
|
FUNC(hilse_inc_ddi, 0, HILSEN_NEXT, HILSEN_START, 0) |
|
FUNC(hilse_take_idd, 0, HILSEN_MATCH, HILSEN_IFCACF, HILSEN_FOLLOW) |
|
OUT_LAST(HIL_PKT_CMD | HIL_CMD_RSC) |
|
EXPECT_LAST(HIL_PKT_CMD | HIL_CMD_RSC | HIL_ERR_INT, |
|
30000, HILSEN_NEXT, HILSEN_DSR, HILSEN_DSR) |
|
FUNC(hilse_take_rsc, 0, HILSEN_MATCH, 0, HILSEN_FOLLOW) |
|
OUT_LAST(HIL_PKT_CMD | HIL_CMD_EXD) |
|
EXPECT_LAST(HIL_PKT_CMD | HIL_CMD_EXD | HIL_ERR_INT, |
|
30000, HILSEN_NEXT, HILSEN_DSR, HILSEN_DSR) |
|
FUNC(hilse_take_exd, 0, HILSEN_MATCH, 0, HILSEN_FOLLOW) |
|
OUT_LAST(HIL_PKT_CMD | HIL_CMD_RNM) |
|
EXPECT_LAST(HIL_PKT_CMD | HIL_CMD_RNM | HIL_ERR_INT, |
|
30000, HILSEN_NEXT, HILSEN_DSR, HILSEN_DSR) |
|
FUNC(hilse_take_rnm, 0, HILSEN_MATCH, 0, 0) |
|
|
|
/* 40 HILSEN_MATCH */ |
|
FUNC(hilse_match, 0, HILSEN_NEXT, HILSEN_NEXT, /* TODO */ 0) |
|
|
|
/* 41 HILSEN_OPERATE */ |
|
OUT(HIL_PKT_CMD | HIL_CMD_POL) |
|
EXPECT(HIL_PKT_CMD | HIL_CMD_POL | HIL_ERR_INT, |
|
20000, HILSEN_NEXT, HILSEN_DSR, HILSEN_NEXT) |
|
FUNC(hilse_operate, 0, HILSEN_OPERATE, HILSEN_IFC, HILSEN_NEXT) |
|
|
|
/* 44 HILSEN_PROBE */ |
|
OUT_LAST(HIL_PKT_CMD | HIL_CMD_EPT) |
|
IN(10000, HILSEN_DISC, HILSEN_DSR, HILSEN_NEXT) |
|
OUT_DISC(HIL_PKT_CMD | HIL_CMD_ELB) |
|
IN(10000, HILSEN_DISC, HILSEN_DSR, HILSEN_NEXT) |
|
OUT(HIL_PKT_CMD | HIL_CMD_ACF | 1) |
|
IN(10000, HILSEN_DISC0, HILSEN_DSR, HILSEN_NEXT) |
|
OUT_LAST(HIL_PKT_CMD | HIL_CMD_ELB) |
|
IN(10000, HILSEN_OPERATE, HILSEN_DSR, HILSEN_DSR) |
|
|
|
/* 52 HILSEN_DSR */ |
|
FUNC(hilse_set_ddi, -1, HILSEN_NEXT, 0, 0) |
|
OUT(HIL_PKT_CMD | HIL_CMD_DSR) |
|
IN(20000, HILSEN_DHR, HILSEN_DHR, HILSEN_IFC) |
|
|
|
/* 55 HILSEN_REPOLL */ |
|
OUT(HIL_PKT_CMD | HIL_CMD_RPL) |
|
EXPECT(HIL_PKT_CMD | HIL_CMD_RPL | HIL_ERR_INT, |
|
20000, HILSEN_NEXT, HILSEN_DSR, HILSEN_NEXT) |
|
FUNC(hilse_operate, 1, HILSEN_OPERATE, HILSEN_IFC, HILSEN_PROBE) |
|
|
|
/* 58 HILSEN_IFCACF */ |
|
OUT(HIL_PKT_CMD | HIL_CMD_IFC) |
|
EXPECT(HIL_PKT_CMD | HIL_CMD_IFC | HIL_ERR_INT, |
|
20000, HILSEN_ACF2, HILSEN_DHR2, HILSEN_HEAL) |
|
|
|
/* 60 HILSEN_END */ |
|
}; |
|
|
|
static inline void hilse_setup_input(hil_mlc *mlc, const struct hilse_node *node) |
|
{ |
|
|
|
switch (node->act) { |
|
case HILSE_EXPECT_DISC: |
|
mlc->imatch = node->object.packet; |
|
mlc->imatch |= ((mlc->ddi + 2) << HIL_PKT_ADDR_SHIFT); |
|
break; |
|
case HILSE_EXPECT_LAST: |
|
mlc->imatch = node->object.packet; |
|
mlc->imatch |= ((mlc->ddi + 1) << HIL_PKT_ADDR_SHIFT); |
|
break; |
|
case HILSE_EXPECT: |
|
mlc->imatch = node->object.packet; |
|
break; |
|
case HILSE_IN: |
|
mlc->imatch = 0; |
|
break; |
|
default: |
|
BUG(); |
|
} |
|
mlc->istarted = 1; |
|
mlc->intimeout = usecs_to_jiffies(node->arg); |
|
mlc->instart = jiffies; |
|
mlc->icount = 15; |
|
memset(mlc->ipacket, 0, 16 * sizeof(hil_packet)); |
|
BUG_ON(down_trylock(&mlc->isem)); |
|
} |
|
|
|
#ifdef HIL_MLC_DEBUG |
|
static int doze; |
|
static int seidx; /* For debug */ |
|
#endif |
|
|
|
static int hilse_donode(hil_mlc *mlc) |
|
{ |
|
const struct hilse_node *node; |
|
int nextidx = 0; |
|
int sched_long = 0; |
|
unsigned long flags; |
|
|
|
#ifdef HIL_MLC_DEBUG |
|
if (mlc->seidx && mlc->seidx != seidx && |
|
mlc->seidx != 41 && mlc->seidx != 42 && mlc->seidx != 43) { |
|
printk(KERN_DEBUG PREFIX "z%i \n {%i}", doze, mlc->seidx); |
|
doze = 0; |
|
} |
|
|
|
seidx = mlc->seidx; |
|
#endif |
|
node = hil_mlc_se + mlc->seidx; |
|
|
|
switch (node->act) { |
|
int rc; |
|
hil_packet pack; |
|
|
|
case HILSE_FUNC: |
|
BUG_ON(node->object.func == NULL); |
|
rc = node->object.func(mlc, node->arg); |
|
nextidx = (rc > 0) ? node->ugly : |
|
((rc < 0) ? node->bad : node->good); |
|
if (nextidx == HILSEN_FOLLOW) |
|
nextidx = rc; |
|
break; |
|
|
|
case HILSE_EXPECT_LAST: |
|
case HILSE_EXPECT_DISC: |
|
case HILSE_EXPECT: |
|
case HILSE_IN: |
|
/* Already set up from previous HILSE_OUT_* */ |
|
write_lock_irqsave(&mlc->lock, flags); |
|
rc = mlc->in(mlc, node->arg); |
|
if (rc == 2) { |
|
nextidx = HILSEN_DOZE; |
|
sched_long = 1; |
|
write_unlock_irqrestore(&mlc->lock, flags); |
|
break; |
|
} |
|
if (rc == 1) |
|
nextidx = node->ugly; |
|
else if (rc == 0) |
|
nextidx = node->good; |
|
else |
|
nextidx = node->bad; |
|
mlc->istarted = 0; |
|
write_unlock_irqrestore(&mlc->lock, flags); |
|
break; |
|
|
|
case HILSE_OUT_LAST: |
|
write_lock_irqsave(&mlc->lock, flags); |
|
pack = node->object.packet; |
|
pack |= ((mlc->ddi + 1) << HIL_PKT_ADDR_SHIFT); |
|
goto out; |
|
|
|
case HILSE_OUT_DISC: |
|
write_lock_irqsave(&mlc->lock, flags); |
|
pack = node->object.packet; |
|
pack |= ((mlc->ddi + 2) << HIL_PKT_ADDR_SHIFT); |
|
goto out; |
|
|
|
case HILSE_OUT: |
|
write_lock_irqsave(&mlc->lock, flags); |
|
pack = node->object.packet; |
|
out: |
|
if (!mlc->istarted) { |
|
/* Prepare to receive input */ |
|
if ((node + 1)->act & HILSE_IN) |
|
hilse_setup_input(mlc, node + 1); |
|
} |
|
|
|
write_unlock_irqrestore(&mlc->lock, flags); |
|
|
|
if (down_trylock(&mlc->osem)) { |
|
nextidx = HILSEN_DOZE; |
|
break; |
|
} |
|
up(&mlc->osem); |
|
|
|
write_lock_irqsave(&mlc->lock, flags); |
|
if (!mlc->ostarted) { |
|
mlc->ostarted = 1; |
|
mlc->opacket = pack; |
|
rc = mlc->out(mlc); |
|
nextidx = HILSEN_DOZE; |
|
write_unlock_irqrestore(&mlc->lock, flags); |
|
if (rc) { |
|
hil_mlc_stop = 1; |
|
return 1; |
|
} |
|
break; |
|
} |
|
mlc->ostarted = 0; |
|
mlc->instart = jiffies; |
|
write_unlock_irqrestore(&mlc->lock, flags); |
|
nextidx = HILSEN_NEXT; |
|
break; |
|
|
|
case HILSE_CTS: |
|
write_lock_irqsave(&mlc->lock, flags); |
|
rc = mlc->cts(mlc); |
|
nextidx = rc ? node->bad : node->good; |
|
write_unlock_irqrestore(&mlc->lock, flags); |
|
if (rc) { |
|
hil_mlc_stop = 1; |
|
return 1; |
|
} |
|
break; |
|
|
|
default: |
|
BUG(); |
|
} |
|
|
|
#ifdef HIL_MLC_DEBUG |
|
if (nextidx == HILSEN_DOZE) |
|
doze++; |
|
#endif |
|
|
|
while (nextidx & HILSEN_SCHED) { |
|
unsigned long now = jiffies; |
|
|
|
if (!sched_long) |
|
goto sched; |
|
|
|
if (time_after(now, mlc->instart + mlc->intimeout)) |
|
goto sched; |
|
mod_timer(&hil_mlcs_kicker, mlc->instart + mlc->intimeout); |
|
break; |
|
sched: |
|
tasklet_schedule(&hil_mlcs_tasklet); |
|
break; |
|
} |
|
|
|
if (nextidx & HILSEN_DOWN) |
|
mlc->seidx += nextidx & HILSEN_MASK; |
|
else if (nextidx & HILSEN_UP) |
|
mlc->seidx -= nextidx & HILSEN_MASK; |
|
else |
|
mlc->seidx = nextidx & HILSEN_MASK; |
|
|
|
if (nextidx & HILSEN_BREAK) |
|
return 1; |
|
|
|
return 0; |
|
} |
|
|
|
/******************** tasklet context functions **************************/ |
|
static void hil_mlcs_process(unsigned long unused) |
|
{ |
|
struct list_head *tmp; |
|
|
|
read_lock(&hil_mlcs_lock); |
|
list_for_each(tmp, &hil_mlcs) { |
|
struct hil_mlc *mlc = list_entry(tmp, hil_mlc, list); |
|
while (hilse_donode(mlc) == 0) { |
|
#ifdef HIL_MLC_DEBUG |
|
if (mlc->seidx != 41 && |
|
mlc->seidx != 42 && |
|
mlc->seidx != 43) |
|
printk(KERN_DEBUG PREFIX " + "); |
|
#endif |
|
} |
|
} |
|
read_unlock(&hil_mlcs_lock); |
|
} |
|
|
|
/************************* Keepalive timer task *********************/ |
|
|
|
static void hil_mlcs_timer(struct timer_list *unused) |
|
{ |
|
if (hil_mlc_stop) { |
|
/* could not send packet - stop immediately. */ |
|
pr_warn(PREFIX "HIL seems stuck - Disabling HIL MLC.\n"); |
|
return; |
|
} |
|
|
|
hil_mlcs_probe = 1; |
|
tasklet_schedule(&hil_mlcs_tasklet); |
|
/* Re-insert the periodic task. */ |
|
if (!timer_pending(&hil_mlcs_kicker)) |
|
mod_timer(&hil_mlcs_kicker, jiffies + HZ); |
|
} |
|
|
|
/******************** user/kernel context functions **********************/ |
|
|
|
static int hil_mlc_serio_write(struct serio *serio, unsigned char c) |
|
{ |
|
struct hil_mlc_serio_map *map; |
|
struct hil_mlc *mlc; |
|
struct serio_driver *drv; |
|
uint8_t *idx, *last; |
|
|
|
map = serio->port_data; |
|
BUG_ON(map == NULL); |
|
|
|
mlc = map->mlc; |
|
BUG_ON(mlc == NULL); |
|
|
|
mlc->serio_opacket[map->didx] |= |
|
((hil_packet)c) << (8 * (3 - mlc->serio_oidx[map->didx])); |
|
|
|
if (mlc->serio_oidx[map->didx] >= 3) { |
|
/* for now only commands */ |
|
if (!(mlc->serio_opacket[map->didx] & HIL_PKT_CMD)) |
|
return -EIO; |
|
switch (mlc->serio_opacket[map->didx] & HIL_PKT_DATA_MASK) { |
|
case HIL_CMD_IDD: |
|
idx = mlc->di[map->didx].idd; |
|
goto emu; |
|
case HIL_CMD_RSC: |
|
idx = mlc->di[map->didx].rsc; |
|
goto emu; |
|
case HIL_CMD_EXD: |
|
idx = mlc->di[map->didx].exd; |
|
goto emu; |
|
case HIL_CMD_RNM: |
|
idx = mlc->di[map->didx].rnm; |
|
goto emu; |
|
default: |
|
break; |
|
} |
|
mlc->serio_oidx[map->didx] = 0; |
|
mlc->serio_opacket[map->didx] = 0; |
|
} |
|
|
|
mlc->serio_oidx[map->didx]++; |
|
return -EIO; |
|
emu: |
|
drv = serio->drv; |
|
BUG_ON(drv == NULL); |
|
|
|
last = idx + 15; |
|
while ((last != idx) && (*last == 0)) |
|
last--; |
|
|
|
while (idx != last) { |
|
drv->interrupt(serio, 0, 0); |
|
drv->interrupt(serio, HIL_ERR_INT >> 16, 0); |
|
drv->interrupt(serio, 0, 0); |
|
drv->interrupt(serio, *idx, 0); |
|
idx++; |
|
} |
|
drv->interrupt(serio, 0, 0); |
|
drv->interrupt(serio, HIL_ERR_INT >> 16, 0); |
|
drv->interrupt(serio, HIL_PKT_CMD >> 8, 0); |
|
drv->interrupt(serio, *idx, 0); |
|
|
|
mlc->serio_oidx[map->didx] = 0; |
|
mlc->serio_opacket[map->didx] = 0; |
|
|
|
return 0; |
|
} |
|
|
|
static int hil_mlc_serio_open(struct serio *serio) |
|
{ |
|
struct hil_mlc_serio_map *map; |
|
struct hil_mlc *mlc; |
|
|
|
if (serio_get_drvdata(serio) != NULL) |
|
return -EBUSY; |
|
|
|
map = serio->port_data; |
|
BUG_ON(map == NULL); |
|
|
|
mlc = map->mlc; |
|
BUG_ON(mlc == NULL); |
|
|
|
return 0; |
|
} |
|
|
|
static void hil_mlc_serio_close(struct serio *serio) |
|
{ |
|
struct hil_mlc_serio_map *map; |
|
struct hil_mlc *mlc; |
|
|
|
map = serio->port_data; |
|
BUG_ON(map == NULL); |
|
|
|
mlc = map->mlc; |
|
BUG_ON(mlc == NULL); |
|
|
|
serio_set_drvdata(serio, NULL); |
|
serio->drv = NULL; |
|
/* TODO wake up interruptable */ |
|
} |
|
|
|
static const struct serio_device_id hil_mlc_serio_id = { |
|
.type = SERIO_HIL_MLC, |
|
.proto = SERIO_HIL, |
|
.extra = SERIO_ANY, |
|
.id = SERIO_ANY, |
|
}; |
|
|
|
int hil_mlc_register(hil_mlc *mlc) |
|
{ |
|
int i; |
|
unsigned long flags; |
|
|
|
BUG_ON(mlc == NULL); |
|
|
|
mlc->istarted = 0; |
|
mlc->ostarted = 0; |
|
|
|
rwlock_init(&mlc->lock); |
|
sema_init(&mlc->osem, 1); |
|
|
|
sema_init(&mlc->isem, 1); |
|
mlc->icount = -1; |
|
mlc->imatch = 0; |
|
|
|
mlc->opercnt = 0; |
|
|
|
sema_init(&(mlc->csem), 0); |
|
|
|
hil_mlc_clear_di_scratch(mlc); |
|
hil_mlc_clear_di_map(mlc, 0); |
|
for (i = 0; i < HIL_MLC_DEVMEM; i++) { |
|
struct serio *mlc_serio; |
|
hil_mlc_copy_di_scratch(mlc, i); |
|
mlc_serio = kzalloc(sizeof(*mlc_serio), GFP_KERNEL); |
|
mlc->serio[i] = mlc_serio; |
|
if (!mlc->serio[i]) { |
|
for (; i >= 0; i--) |
|
kfree(mlc->serio[i]); |
|
return -ENOMEM; |
|
} |
|
snprintf(mlc_serio->name, sizeof(mlc_serio->name)-1, "HIL_SERIO%d", i); |
|
snprintf(mlc_serio->phys, sizeof(mlc_serio->phys)-1, "HIL%d", i); |
|
mlc_serio->id = hil_mlc_serio_id; |
|
mlc_serio->id.id = i; /* HIL port no. */ |
|
mlc_serio->write = hil_mlc_serio_write; |
|
mlc_serio->open = hil_mlc_serio_open; |
|
mlc_serio->close = hil_mlc_serio_close; |
|
mlc_serio->port_data = &(mlc->serio_map[i]); |
|
mlc->serio_map[i].mlc = mlc; |
|
mlc->serio_map[i].didx = i; |
|
mlc->serio_map[i].di_revmap = -1; |
|
mlc->serio_opacket[i] = 0; |
|
mlc->serio_oidx[i] = 0; |
|
serio_register_port(mlc_serio); |
|
} |
|
|
|
mlc->tasklet = &hil_mlcs_tasklet; |
|
|
|
write_lock_irqsave(&hil_mlcs_lock, flags); |
|
list_add_tail(&mlc->list, &hil_mlcs); |
|
mlc->seidx = HILSEN_START; |
|
write_unlock_irqrestore(&hil_mlcs_lock, flags); |
|
|
|
tasklet_schedule(&hil_mlcs_tasklet); |
|
return 0; |
|
} |
|
|
|
int hil_mlc_unregister(hil_mlc *mlc) |
|
{ |
|
struct list_head *tmp; |
|
unsigned long flags; |
|
int i; |
|
|
|
BUG_ON(mlc == NULL); |
|
|
|
write_lock_irqsave(&hil_mlcs_lock, flags); |
|
list_for_each(tmp, &hil_mlcs) |
|
if (list_entry(tmp, hil_mlc, list) == mlc) |
|
goto found; |
|
|
|
/* not found in list */ |
|
write_unlock_irqrestore(&hil_mlcs_lock, flags); |
|
tasklet_schedule(&hil_mlcs_tasklet); |
|
return -ENODEV; |
|
|
|
found: |
|
list_del(tmp); |
|
write_unlock_irqrestore(&hil_mlcs_lock, flags); |
|
|
|
for (i = 0; i < HIL_MLC_DEVMEM; i++) { |
|
serio_unregister_port(mlc->serio[i]); |
|
mlc->serio[i] = NULL; |
|
} |
|
|
|
tasklet_schedule(&hil_mlcs_tasklet); |
|
return 0; |
|
} |
|
|
|
/**************************** Module interface *************************/ |
|
|
|
static int __init hil_mlc_init(void) |
|
{ |
|
timer_setup(&hil_mlcs_kicker, &hil_mlcs_timer, 0); |
|
mod_timer(&hil_mlcs_kicker, jiffies + HZ); |
|
|
|
tasklet_enable(&hil_mlcs_tasklet); |
|
|
|
return 0; |
|
} |
|
|
|
static void __exit hil_mlc_exit(void) |
|
{ |
|
del_timer_sync(&hil_mlcs_kicker); |
|
tasklet_kill(&hil_mlcs_tasklet); |
|
} |
|
|
|
module_init(hil_mlc_init); |
|
module_exit(hil_mlc_exit);
|
|
|