d829075a00
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@16400 a1c6a512-1295-4272-9138-f99709370657
609 lines
14 KiB
C
609 lines
14 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2008 by Mark Arigo
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*
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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include <stdlib.h>
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#include "config.h"
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#include "cpu.h"
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#include "system.h"
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#include "button.h"
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#include "kernel.h"
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#include "backlight.h"
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#include "backlight-target.h"
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#include "system.h"
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#define LOGF_ENABLE
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#include "logf.h"
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/* Driver for the Synaptics Touchpad based on the "Synaptics Modular Embedded
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Protocol: 3-Wire Interface Specification" documentation */
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#define ACK (GPIOD_INPUT_VAL & 0x1)
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#define ACK_HI GPIOD_OUTPUT_VAL |= 0x1
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#define ACK_LO GPIOD_OUTPUT_VAL &= ~0x1
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#define CLK ((GPIOD_INPUT_VAL & 0x2) >> 1)
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#define CLK_HI GPIOD_OUTPUT_VAL |= 0x2
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#define CLK_LO GPIOD_OUTPUT_VAL &= ~0x2
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#define DATA ((GPIOD_INPUT_VAL & 0x4) >> 2)
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#define DATA_HI GPIOD_OUTPUT_EN |= 0x4; GPIOD_OUTPUT_VAL |= 0x4
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#define DATA_LO GPIOD_OUTPUT_EN |= 0x4; GPIOD_OUTPUT_VAL &= ~0x4
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#define LO 0
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#define HI 1
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#define STATUS_READY 1
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#define READ_RETRY 8
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#define READ_ERROR -1
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#define HELLO_HEADER 0x19
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#define HELLO_ID 0x1
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#define BUTTONS_HEADER 0x1a
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#define BUTTONS_ID 0x9
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#define ABSOLUTE_HEADER 0x0b
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static int syn_status = 0;
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static int int_btn = BUTTON_NONE;
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static int syn_wait_clk_change(unsigned int val)
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{
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int i;
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for (i = 0; i < 10000; i++)
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{
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if (CLK == val)
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return 1;
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}
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return 0;
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}
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static inline int syn_get_data(void)
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{
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GPIOD_OUTPUT_EN &= ~0x4;
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return DATA;
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}
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static void syn_wait_guest_flush(void)
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{
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/* Flush receiving (flushee) state:
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handshake until DATA goes high during P3 stage */
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if (CLK == LO)
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{
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ACK_HI; /* P1 -> P2 */
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syn_wait_clk_change(HI); /* P2 -> P3 */
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}
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while (syn_get_data() == LO)
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{
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ACK_HI; /* P3 -> P0 */
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syn_wait_clk_change(LO); /* P0 -> P1 */
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ACK_LO; /* P1 -> P2 */
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syn_wait_clk_change(HI); /* P2 -> P3 */
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}
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/* Continue handshaking until back to P0 */
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ACK_HI; /* P3 -> P0 */
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}
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static void syn_flush(void)
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{
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int i;
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logf("syn_flush...");
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/* Flusher holds DATA low for at least 36 handshake cycles */
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DATA_LO;
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for (i = 0; i < 36; i++)
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{
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syn_wait_clk_change(LO); /* P0 -> P1 */
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ACK_LO; /* P1 -> P2 */
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syn_wait_clk_change(HI); /* P2 -> P3 */
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ACK_HI; /* P3 -> P0 */
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}
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/* Raise DATA in P1 stage */
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syn_wait_clk_change(LO); /* P0 -> P1 */
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DATA_HI;
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/* After a flush, the flushing device enters a flush-receiving (flushee)
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state */
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syn_wait_guest_flush();
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}
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static int syn_send_data(int *data, int len)
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{
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int i, bit;
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int parity = 0;
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logf("syn_send_data...");
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/* 1. Lower DATA line to issue a request-to-send to guest */
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DATA_LO;
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/* 2. Wait for guest to lower CLK */
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syn_wait_clk_change(LO);
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/* 3. Lower ACK (with DATA still low) */
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ACK_LO;
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/* 4. Wait for guest to raise CLK */
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syn_wait_clk_change(HI);
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/* 5. Send data */
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for (i = 0; i < len; i++)
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{
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logf(" sending byte: %d", data[i]);
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bit = 0;
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while (bit < 8)
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{
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/* 5a. Drive data low if bit is 0, or high if bit is 1 */
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if (data[i] & (1 << bit))
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{
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DATA_HI;
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parity++;
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}
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else
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{
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DATA_LO;
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}
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bit++;
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/* 5b. Invert ACK to indicate that the data bit is ready */
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ACK_HI;
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/* 5c. Wait for guest to invert CLK */
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syn_wait_clk_change(LO);
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/* Repeat for next bit */
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if (data[i] & (1 << bit))
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{
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DATA_HI;
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parity++;
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}
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else
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{
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DATA_LO;
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}
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bit++;
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ACK_LO;
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syn_wait_clk_change(HI);
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}
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}
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/* 7. Transmission termination sequence: */
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/* 7a. Host may put parity bit on DATA. Hosts that do not generate
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parity should set DATA high. Parity is 1 if there's an odd
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number of '1' bits, or 0 if there's an even number of '1' bits. */
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parity = parity % 2;
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logf(" send parity = %d", parity);
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if (parity)
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{
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DATA_HI;
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}
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else
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{
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DATA_LO;
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}
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/* 7b. Raise ACK to indicate that the optional parity bit is ready */
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ACK_HI;
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/* 7c. Guest lowers CLK */
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syn_wait_clk_change(LO);
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/* 7d. Pull DATA high (if parity bit was 0) */
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DATA_HI;
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/* 7e. Lower ACK to indicate that the stop bit is ready */
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ACK_LO;
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/* 7f. Guest raises CLK */
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syn_wait_clk_change(HI);
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/* 7g. If DATA is low, guest is flushing this transfer. Host should
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enter the flushee state. */
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if (syn_get_data() == LO)
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{
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logf(" module flushing");
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syn_wait_guest_flush();
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return -1;
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}
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/* 7h. Host raises ACK and the link enters the idle state */
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ACK_HI;
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return len;
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}
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static int syn_read_data(int *data, int data_len)
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{
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int i, len, bit, parity, tmp;
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int *data_ptr;
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logf("syn_read_data...");
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/* 1. Guest drives CLK low */
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if (CLK != LO)
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return 0;
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/* 1a. If the host is willing to receive a packet it lowers ACK */
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ACK_LO;
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/* 2. Guest may issue a request-to-send by lowering DATA. If the
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guest decides not to transmit a packet, it may abort the
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transmission by not lowering DATA. */
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/* 3. The guest raises CLK */
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syn_wait_clk_change(HI);
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/* 4. If the guest is still driving DATA low, the transfer is commited
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to occur. Otherwise, the transfer is aborted. In either case,
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the host raises ACK. */
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if (syn_get_data() == HI)
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{
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logf(" read abort");
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ACK_HI;
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return READ_ERROR;
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}
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else
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{
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ACK_HI;
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}
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/* 5. Read the incoming data packet */
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i = 0;
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len = 0;
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parity = 0;
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while (i <= len)
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{
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bit = 0;
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if (i < data_len)
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data_ptr = &data[i];
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else
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data_ptr = &tmp;
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*data_ptr = 0;
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while (bit < 8)
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{
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/* 5b. Guset inverts CLK to indicate that data is ready */
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syn_wait_clk_change(LO);
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/* 5d. Read the data bit from DATA */
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if (syn_get_data() == HI)
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{
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*data_ptr |= (1 << bit);
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parity++;
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}
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bit++;
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/* 5e. Invert ACK to indicate that data has been read */
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ACK_LO;
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/* Repeat for next bit */
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syn_wait_clk_change(HI);
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if (syn_get_data() == HI)
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{
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*data_ptr |= (1 << bit);
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parity++;
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}
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bit++;
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ACK_HI;
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}
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/* First byte is the packet header */
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if (i == 0)
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{
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/* Format control (bit 3) should be 1 */
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if (*data_ptr & 0x8)
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{
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/* Packet length is bits 0:2 */
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len = *data_ptr & 0x7;
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logf(" packet length = %d", len);
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}
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else
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{
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logf(" invalid format ctrl bit");
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return READ_ERROR;
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}
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}
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i++;
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}
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/* 7. Transmission termination cycle */
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/* 7a. The guest generates a parity bit on DATA */
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/* 7b. The host waits for guest to lower CLK */
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syn_wait_clk_change(LO);
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/* 7c. The host verifies the parity bit is correct */
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parity = parity % 2;
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logf(" parity check: %d / %d", syn_get_data(), parity);
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/* TODO: parity error handling */
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/* 7d. The host lowers ACK */
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ACK_LO;
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/* 7e. The host waits for the guest to raise CLK indicating
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that the stop bit is ready */
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syn_wait_clk_change(HI);
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/* 7f. The host reads DATA and verifies that it is 1 */
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if (syn_get_data() == LO)
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{
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logf(" framing error");
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ACK_HI;
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return READ_ERROR;
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}
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ACK_HI;
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return len;
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}
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static int syn_read_device(int *data, int len)
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{
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int i;
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int ret = READ_ERROR;
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for (i = 0; i < READ_RETRY; i++)
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{
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if (syn_wait_clk_change(LO))
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{
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/* module is sending data */
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ret = syn_read_data(data, len);
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if (ret != READ_ERROR)
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return ret;
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syn_flush();
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}
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else
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{
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/* module is idle */
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return 0;
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}
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}
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return ret;
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}
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static int syn_reset(void)
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{
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int val, id;
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int data[2];
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logf("syn_reset...");
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/* reset module 0 */
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val = (0 << 4) | (1 << 3) | 0;
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syn_send_data(&val, 1);
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val = syn_read_device(data, 2);
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if (val == 1)
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{
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val = data[0] & 0xff; /* packet header */
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id = (data[1] >> 4) & 0xf; /* packet id */
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if ((val == HELLO_HEADER) && (id == HELLO_ID))
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{
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logf(" module 0 reset");
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return 1;
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}
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}
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logf(" reset failed");
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return 0;
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}
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#if defined(ROCKBOX_HAS_LOGF) && defined(LOGF_ENABLE)
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static void syn_info(void)
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{
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int i, val;
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int data[8];
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logf("syn_info...");
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/* module base info */
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logf("module base info:");
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data[0] = (0 << 4) | (0 << 3) | 1;
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data[1] = 0x80;
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syn_send_data(data, 2);
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val = syn_read_device(data, 8);
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if (val > 0)
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{
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for (i = 0; i < 8; i++)
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logf(" data[%d] = 0x%02x", i, data[i]);
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}
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/* module product info */
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logf("module product info:");
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data[0] = (0 << 4) | (0 << 3) | 1;
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data[1] = 0x81;
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syn_send_data(data, 2);
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val = syn_read_device(data, 8);
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if (val > 0)
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{
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for (i = 0; i < 8; i++)
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logf(" data[%d] = 0x%02x", i, data[i]);
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}
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/* module serialization */
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logf("module serialization:");
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data[0] = (0 << 4) | (0 << 3) | 1;
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data[1] = 0x82;
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syn_send_data(data, 2);
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val = syn_read_device(data, 8);
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if (val > 0)
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{
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for (i = 0; i < 8; i++)
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logf(" data[%d] = 0x%02x", i, data[i]);
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}
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/* 1-D sensor info */
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logf("1-d sensor info:");
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data[0] = (0 << 4) | (0 << 3) | 1;
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data[1] = 0x80 + 0x20;
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syn_send_data(data, 2);
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val = syn_read_device(data, 8);
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if (val > 0)
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{
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for (i = 0; i < 8; i++)
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logf(" data[%d] = 0x%02x", i, data[i]);
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}
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}
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#endif
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void button_init_device(void)
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{
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/* enable touchpad leds */
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GPIOA_ENABLE |= BUTTONLIGHT_ALL;
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GPIOA_OUTPUT_EN |= BUTTONLIGHT_ALL;
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/* enable touchpad */
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GPO32_ENABLE |= 0x40000000;
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GPO32_VAL &= ~0x40000000;
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/* enable ACK, CLK, DATA lines */
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GPIOD_ENABLE |= (0x1 | 0x2 | 0x4);
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GPIOD_OUTPUT_EN |= 0x1; /* ACK */
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GPIOD_OUTPUT_VAL |= 0x1; /* high */
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GPIOD_OUTPUT_EN &= ~0x2; /* CLK */
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GPIOD_OUTPUT_EN |= 0x4; /* DATA */
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GPIOD_OUTPUT_VAL |= 0x4; /* high */
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syn_flush();
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if (syn_reset())
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{
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#if defined(ROCKBOX_HAS_LOGF) && defined(LOGF_ENABLE)
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syn_info();
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#endif
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syn_status = STATUS_READY;
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/* enable interrupts */
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GPIOD_INT_LEV &= ~0x2;
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GPIOD_INT_CLR |= 0x2;
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GPIOD_INT_EN |= 0x2;
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CPU_INT_EN |= HI_MASK;
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CPU_HI_INT_EN |= GPIO0_MASK;
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}
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}
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/*
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* Button interrupt handler
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*/
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void button_int(void)
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{
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int data[4];
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int val, id;
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int_btn = BUTTON_NONE;
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if (syn_status == STATUS_READY)
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{
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/* disable interrupt while we read the touchpad */
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GPIOD_INT_EN &= ~0x2;
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val = syn_read_device(data, 4);
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if (val > 0)
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{
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val = data[0] & 0xff; /* packet header */
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id = (data[1] >> 4) & 0xf; /* packet id */
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logf("button_read_device...");
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logf(" data[0] = 0x%08x", data[0]);
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logf(" data[1] = 0x%08x", data[1]);
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logf(" data[2] = 0x%08x", data[2]);
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logf(" data[3] = 0x%08x", data[3]);
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if ((val == BUTTONS_HEADER) && (id == BUTTONS_ID))
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{
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/* Buttons packet - touched one of the 5 "buttons" */
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if (data[1] & 0x1)
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int_btn |= BUTTON_PLAY;
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if (data[1] & 0x2)
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int_btn |= BUTTON_MENU;
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if (data[1] & 0x4)
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int_btn |= BUTTON_LEFT;
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if (data[1] & 0x8)
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int_btn |= BUTTON_DISPLAY;
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if (data[2] & 0x1)
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int_btn |= BUTTON_RIGHT;
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/* An Absolute packet should follow which we ignore */
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val = syn_read_device(data, 4);
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logf(" int_btn = 0x%04x", int_btn);
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}
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else if (val == ABSOLUTE_HEADER)
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{
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/* Absolute packet - the finger is on the vertical strip.
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Position ranges from 1-4095, with 1 at the bottom. */
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val = ((data[1] >> 4) << 8) | data[2]; /* position */
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if ((val > 0) && (val <= 1365))
|
|
int_btn |= BUTTON_DOWN;
|
|
else if ((val > 1365) && (val <= 2730))
|
|
int_btn |= BUTTON_SELECT;
|
|
else if ((val > 2730) && (val <= 4095))
|
|
int_btn |= BUTTON_UP;
|
|
}
|
|
}
|
|
|
|
/* re-enable interrupts */
|
|
GPIOD_INT_LEV &= ~0x2;
|
|
GPIOD_INT_CLR |= 0x2;
|
|
GPIOD_INT_EN |= 0x2;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Get button pressed from hardware
|
|
*/
|
|
int button_read_device(void)
|
|
{
|
|
int btn = int_btn;
|
|
|
|
if (~GPIOA_INPUT_VAL & 0x40)
|
|
btn |= BUTTON_POWER;
|
|
|
|
return btn;
|
|
}
|
|
|
|
bool button_hold(void)
|
|
{
|
|
return (GPIOD_INPUT_VAL & 0x10) ? false : true;
|
|
}
|
|
|
|
bool headphones_inserted(void)
|
|
{
|
|
return (GPIOD_INPUT_VAL & 0x80) ? true : false;
|
|
}
|