mirror of https://gitee.com/openkylin/linux.git
1091 lines
26 KiB
C
1091 lines
26 KiB
C
/*
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* ds2490.c USB to one wire bridge
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*
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* Copyright (c) 2004 Evgeniy Polyakov <zbr@ioremap.net>
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*
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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/module.h>
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#include <linux/kernel.h>
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#include <linux/mod_devicetable.h>
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#include <linux/usb.h>
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#include <linux/slab.h>
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#include "../w1_int.h"
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#include "../w1.h"
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/* USB Standard */
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/* USB Control request vendor type */
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#define VENDOR 0x40
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/* COMMAND TYPE CODES */
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#define CONTROL_CMD 0x00
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#define COMM_CMD 0x01
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#define MODE_CMD 0x02
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/* CONTROL COMMAND CODES */
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#define CTL_RESET_DEVICE 0x0000
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#define CTL_START_EXE 0x0001
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#define CTL_RESUME_EXE 0x0002
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#define CTL_HALT_EXE_IDLE 0x0003
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#define CTL_HALT_EXE_DONE 0x0004
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#define CTL_FLUSH_COMM_CMDS 0x0007
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#define CTL_FLUSH_RCV_BUFFER 0x0008
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#define CTL_FLUSH_XMT_BUFFER 0x0009
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#define CTL_GET_COMM_CMDS 0x000A
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/* MODE COMMAND CODES */
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#define MOD_PULSE_EN 0x0000
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#define MOD_SPEED_CHANGE_EN 0x0001
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#define MOD_1WIRE_SPEED 0x0002
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#define MOD_STRONG_PU_DURATION 0x0003
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#define MOD_PULLDOWN_SLEWRATE 0x0004
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#define MOD_PROG_PULSE_DURATION 0x0005
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#define MOD_WRITE1_LOWTIME 0x0006
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#define MOD_DSOW0_TREC 0x0007
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/* COMMUNICATION COMMAND CODES */
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#define COMM_ERROR_ESCAPE 0x0601
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#define COMM_SET_DURATION 0x0012
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#define COMM_BIT_IO 0x0020
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#define COMM_PULSE 0x0030
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#define COMM_1_WIRE_RESET 0x0042
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#define COMM_BYTE_IO 0x0052
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#define COMM_MATCH_ACCESS 0x0064
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#define COMM_BLOCK_IO 0x0074
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#define COMM_READ_STRAIGHT 0x0080
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#define COMM_DO_RELEASE 0x6092
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#define COMM_SET_PATH 0x00A2
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#define COMM_WRITE_SRAM_PAGE 0x00B2
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#define COMM_WRITE_EPROM 0x00C4
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#define COMM_READ_CRC_PROT_PAGE 0x00D4
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#define COMM_READ_REDIRECT_PAGE_CRC 0x21E4
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#define COMM_SEARCH_ACCESS 0x00F4
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/* Communication command bits */
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#define COMM_TYPE 0x0008
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#define COMM_SE 0x0008
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#define COMM_D 0x0008
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#define COMM_Z 0x0008
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#define COMM_CH 0x0008
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#define COMM_SM 0x0008
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#define COMM_R 0x0008
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#define COMM_IM 0x0001
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#define COMM_PS 0x4000
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#define COMM_PST 0x4000
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#define COMM_CIB 0x4000
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#define COMM_RTS 0x4000
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#define COMM_DT 0x2000
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#define COMM_SPU 0x1000
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#define COMM_F 0x0800
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#define COMM_NTF 0x0400
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#define COMM_ICP 0x0200
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#define COMM_RST 0x0100
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#define PULSE_PROG 0x01
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#define PULSE_SPUE 0x02
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#define BRANCH_MAIN 0xCC
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#define BRANCH_AUX 0x33
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/* Status flags */
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#define ST_SPUA 0x01 /* Strong Pull-up is active */
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#define ST_PRGA 0x02 /* 12V programming pulse is being generated */
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#define ST_12VP 0x04 /* external 12V programming voltage is present */
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#define ST_PMOD 0x08 /* DS2490 powered from USB and external sources */
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#define ST_HALT 0x10 /* DS2490 is currently halted */
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#define ST_IDLE 0x20 /* DS2490 is currently idle */
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#define ST_EPOF 0x80
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/* Status transfer size, 16 bytes status, 16 byte result flags */
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#define ST_SIZE 0x20
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/* Result Register flags */
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#define RR_DETECT 0xA5 /* New device detected */
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#define RR_NRS 0x01 /* Reset no presence or ... */
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#define RR_SH 0x02 /* short on reset or set path */
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#define RR_APP 0x04 /* alarming presence on reset */
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#define RR_VPP 0x08 /* 12V expected not seen */
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#define RR_CMP 0x10 /* compare error */
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#define RR_CRC 0x20 /* CRC error detected */
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#define RR_RDP 0x40 /* redirected page */
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#define RR_EOS 0x80 /* end of search error */
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#define SPEED_NORMAL 0x00
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#define SPEED_FLEXIBLE 0x01
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#define SPEED_OVERDRIVE 0x02
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#define NUM_EP 4
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#define EP_CONTROL 0
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#define EP_STATUS 1
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#define EP_DATA_OUT 2
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#define EP_DATA_IN 3
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struct ds_device
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{
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struct list_head ds_entry;
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struct usb_device *udev;
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struct usb_interface *intf;
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int ep[NUM_EP];
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/* Strong PullUp
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* 0: pullup not active, else duration in milliseconds
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*/
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int spu_sleep;
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/* spu_bit contains COMM_SPU or 0 depending on if the strong pullup
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* should be active or not for writes.
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*/
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u16 spu_bit;
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struct w1_bus_master master;
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};
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struct ds_status
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{
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u8 enable;
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u8 speed;
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u8 pullup_dur;
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u8 ppuls_dur;
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u8 pulldown_slew;
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u8 write1_time;
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u8 write0_time;
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u8 reserved0;
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u8 status;
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u8 command0;
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u8 command1;
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u8 command_buffer_status;
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u8 data_out_buffer_status;
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u8 data_in_buffer_status;
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u8 reserved1;
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u8 reserved2;
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};
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static struct usb_device_id ds_id_table [] = {
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{ USB_DEVICE(0x04fa, 0x2490) },
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{ },
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};
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MODULE_DEVICE_TABLE(usb, ds_id_table);
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static int ds_probe(struct usb_interface *, const struct usb_device_id *);
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static void ds_disconnect(struct usb_interface *);
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static int ds_send_control(struct ds_device *, u16, u16);
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static int ds_send_control_cmd(struct ds_device *, u16, u16);
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static LIST_HEAD(ds_devices);
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static DEFINE_MUTEX(ds_mutex);
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static struct usb_driver ds_driver = {
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.name = "DS9490R",
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.probe = ds_probe,
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.disconnect = ds_disconnect,
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.id_table = ds_id_table,
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};
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static int ds_send_control_cmd(struct ds_device *dev, u16 value, u16 index)
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{
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int err;
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err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, dev->ep[EP_CONTROL]),
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CONTROL_CMD, VENDOR, value, index, NULL, 0, 1000);
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if (err < 0) {
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pr_err("Failed to send command control message %x.%x: err=%d.\n",
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value, index, err);
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return err;
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}
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return err;
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}
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static int ds_send_control_mode(struct ds_device *dev, u16 value, u16 index)
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{
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int err;
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err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, dev->ep[EP_CONTROL]),
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MODE_CMD, VENDOR, value, index, NULL, 0, 1000);
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if (err < 0) {
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pr_err("Failed to send mode control message %x.%x: err=%d.\n",
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value, index, err);
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return err;
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}
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return err;
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}
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static int ds_send_control(struct ds_device *dev, u16 value, u16 index)
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{
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int err;
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err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, dev->ep[EP_CONTROL]),
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COMM_CMD, VENDOR, value, index, NULL, 0, 1000);
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if (err < 0) {
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pr_err("Failed to send control message %x.%x: err=%d.\n",
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value, index, err);
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return err;
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}
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return err;
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}
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static int ds_recv_status_nodump(struct ds_device *dev, struct ds_status *st,
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unsigned char *buf, int size)
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{
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int count, err;
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memset(st, 0, sizeof(*st));
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count = 0;
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err = usb_interrupt_msg(dev->udev, usb_rcvintpipe(dev->udev,
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dev->ep[EP_STATUS]), buf, size, &count, 1000);
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if (err < 0) {
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pr_err("Failed to read 1-wire data from 0x%x: err=%d.\n",
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dev->ep[EP_STATUS], err);
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return err;
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}
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if (count >= sizeof(*st))
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memcpy(st, buf, sizeof(*st));
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return count;
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}
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static inline void ds_print_msg(unsigned char *buf, unsigned char *str, int off)
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{
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pr_info("%45s: %8x\n", str, buf[off]);
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}
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static void ds_dump_status(struct ds_device *dev, unsigned char *buf, int count)
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{
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int i;
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pr_info("0x%x: count=%d, status: ", dev->ep[EP_STATUS], count);
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for (i=0; i<count; ++i)
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pr_info("%02x ", buf[i]);
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pr_info("\n");
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if (count >= 16) {
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ds_print_msg(buf, "enable flag", 0);
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ds_print_msg(buf, "1-wire speed", 1);
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ds_print_msg(buf, "strong pullup duration", 2);
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ds_print_msg(buf, "programming pulse duration", 3);
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ds_print_msg(buf, "pulldown slew rate control", 4);
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ds_print_msg(buf, "write-1 low time", 5);
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ds_print_msg(buf, "data sample offset/write-0 recovery time",
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6);
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ds_print_msg(buf, "reserved (test register)", 7);
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ds_print_msg(buf, "device status flags", 8);
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ds_print_msg(buf, "communication command byte 1", 9);
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ds_print_msg(buf, "communication command byte 2", 10);
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ds_print_msg(buf, "communication command buffer status", 11);
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ds_print_msg(buf, "1-wire data output buffer status", 12);
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ds_print_msg(buf, "1-wire data input buffer status", 13);
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ds_print_msg(buf, "reserved", 14);
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ds_print_msg(buf, "reserved", 15);
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}
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for (i = 16; i < count; ++i) {
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if (buf[i] == RR_DETECT) {
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ds_print_msg(buf, "new device detect", i);
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continue;
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}
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ds_print_msg(buf, "Result Register Value: ", i);
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if (buf[i] & RR_NRS)
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pr_info("NRS: Reset no presence or ...\n");
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if (buf[i] & RR_SH)
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pr_info("SH: short on reset or set path\n");
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if (buf[i] & RR_APP)
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pr_info("APP: alarming presence on reset\n");
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if (buf[i] & RR_VPP)
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pr_info("VPP: 12V expected not seen\n");
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if (buf[i] & RR_CMP)
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pr_info("CMP: compare error\n");
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if (buf[i] & RR_CRC)
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pr_info("CRC: CRC error detected\n");
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if (buf[i] & RR_RDP)
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pr_info("RDP: redirected page\n");
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if (buf[i] & RR_EOS)
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pr_info("EOS: end of search error\n");
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}
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}
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static void ds_reset_device(struct ds_device *dev)
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{
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ds_send_control_cmd(dev, CTL_RESET_DEVICE, 0);
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/* Always allow strong pullup which allow individual writes to use
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* the strong pullup.
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*/
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if (ds_send_control_mode(dev, MOD_PULSE_EN, PULSE_SPUE))
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pr_err("ds_reset_device: Error allowing strong pullup\n");
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/* Chip strong pullup time was cleared. */
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if (dev->spu_sleep) {
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/* lower 4 bits are 0, see ds_set_pullup */
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u8 del = dev->spu_sleep>>4;
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if (ds_send_control(dev, COMM_SET_DURATION | COMM_IM, del))
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pr_err("ds_reset_device: Error setting duration\n");
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}
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}
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static int ds_recv_data(struct ds_device *dev, unsigned char *buf, int size)
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{
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int count, err;
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struct ds_status st;
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/* Careful on size. If size is less than what is available in
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* the input buffer, the device fails the bulk transfer and
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* clears the input buffer. It could read the maximum size of
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* the data buffer, but then do you return the first, last, or
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* some set of the middle size bytes? As long as the rest of
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* the code is correct there will be size bytes waiting. A
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* call to ds_wait_status will wait until the device is idle
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* and any data to be received would have been available.
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*/
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count = 0;
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err = usb_bulk_msg(dev->udev, usb_rcvbulkpipe(dev->udev, dev->ep[EP_DATA_IN]),
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buf, size, &count, 1000);
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if (err < 0) {
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u8 buf[ST_SIZE];
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int count;
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pr_info("Clearing ep0x%x.\n", dev->ep[EP_DATA_IN]);
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usb_clear_halt(dev->udev, usb_rcvbulkpipe(dev->udev, dev->ep[EP_DATA_IN]));
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count = ds_recv_status_nodump(dev, &st, buf, sizeof(buf));
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ds_dump_status(dev, buf, count);
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return err;
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}
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#if 0
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{
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int i;
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printk("%s: count=%d: ", __func__, count);
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for (i=0; i<count; ++i)
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printk("%02x ", buf[i]);
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printk("\n");
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}
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#endif
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return count;
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}
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static int ds_send_data(struct ds_device *dev, unsigned char *buf, int len)
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{
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int count, err;
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count = 0;
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err = usb_bulk_msg(dev->udev, usb_sndbulkpipe(dev->udev, dev->ep[EP_DATA_OUT]), buf, len, &count, 1000);
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if (err < 0) {
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pr_err("Failed to write 1-wire data to ep0x%x: "
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"err=%d.\n", dev->ep[EP_DATA_OUT], err);
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return err;
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}
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return err;
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}
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#if 0
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int ds_stop_pulse(struct ds_device *dev, int limit)
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{
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struct ds_status st;
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int count = 0, err = 0;
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u8 buf[ST_SIZE];
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do {
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err = ds_send_control(dev, CTL_HALT_EXE_IDLE, 0);
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if (err)
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break;
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err = ds_send_control(dev, CTL_RESUME_EXE, 0);
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if (err)
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break;
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err = ds_recv_status_nodump(dev, &st, buf, sizeof(buf));
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if (err)
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break;
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if ((st.status & ST_SPUA) == 0) {
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err = ds_send_control_mode(dev, MOD_PULSE_EN, 0);
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if (err)
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break;
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}
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} while(++count < limit);
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return err;
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}
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int ds_detect(struct ds_device *dev, struct ds_status *st)
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{
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int err;
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err = ds_send_control_cmd(dev, CTL_RESET_DEVICE, 0);
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if (err)
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return err;
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err = ds_send_control(dev, COMM_SET_DURATION | COMM_IM, 0);
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if (err)
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return err;
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err = ds_send_control(dev, COMM_SET_DURATION | COMM_IM | COMM_TYPE, 0x40);
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if (err)
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return err;
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err = ds_send_control_mode(dev, MOD_PULSE_EN, PULSE_PROG);
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if (err)
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return err;
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err = ds_dump_status(dev, st);
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return err;
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}
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#endif /* 0 */
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static int ds_wait_status(struct ds_device *dev, struct ds_status *st)
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{
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u8 buf[ST_SIZE];
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int err, count = 0;
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do {
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st->status = 0;
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err = ds_recv_status_nodump(dev, st, buf, sizeof(buf));
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#if 0
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if (err >= 0) {
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int i;
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printk("0x%x: count=%d, status: ", dev->ep[EP_STATUS], err);
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for (i=0; i<err; ++i)
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printk("%02x ", buf[i]);
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printk("\n");
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}
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#endif
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} while (!(st->status & ST_IDLE) && !(err < 0) && ++count < 100);
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if (err >= 16 && st->status & ST_EPOF) {
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pr_info("Resetting device after ST_EPOF.\n");
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ds_reset_device(dev);
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/* Always dump the device status. */
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count = 101;
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}
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/* Dump the status for errors or if there is extended return data.
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* The extended status includes new device detection (maybe someone
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* can do something with it).
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*/
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if (err > 16 || count >= 100 || err < 0)
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ds_dump_status(dev, buf, err);
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/* Extended data isn't an error. Well, a short is, but the dump
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* would have already told the user that and we can't do anything
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* about it in software anyway.
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*/
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if (count >= 100 || err < 0)
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return -1;
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else
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return 0;
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}
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static int ds_reset(struct ds_device *dev)
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{
|
|
int err;
|
|
|
|
/* Other potentionally interesting flags for reset.
|
|
*
|
|
* COMM_NTF: Return result register feedback. This could be used to
|
|
* detect some conditions such as short, alarming presence, or
|
|
* detect if a new device was detected.
|
|
*
|
|
* COMM_SE which allows SPEED_NORMAL, SPEED_FLEXIBLE, SPEED_OVERDRIVE:
|
|
* Select the data transfer rate.
|
|
*/
|
|
err = ds_send_control(dev, COMM_1_WIRE_RESET | COMM_IM, SPEED_NORMAL);
|
|
if (err)
|
|
return err;
|
|
|
|
return 0;
|
|
}
|
|
|
|
#if 0
|
|
static int ds_set_speed(struct ds_device *dev, int speed)
|
|
{
|
|
int err;
|
|
|
|
if (speed != SPEED_NORMAL && speed != SPEED_FLEXIBLE && speed != SPEED_OVERDRIVE)
|
|
return -EINVAL;
|
|
|
|
if (speed != SPEED_OVERDRIVE)
|
|
speed = SPEED_FLEXIBLE;
|
|
|
|
speed &= 0xff;
|
|
|
|
err = ds_send_control_mode(dev, MOD_1WIRE_SPEED, speed);
|
|
if (err)
|
|
return err;
|
|
|
|
return err;
|
|
}
|
|
#endif /* 0 */
|
|
|
|
static int ds_set_pullup(struct ds_device *dev, int delay)
|
|
{
|
|
int err = 0;
|
|
u8 del = 1 + (u8)(delay >> 4);
|
|
/* Just storing delay would not get the trunication and roundup. */
|
|
int ms = del<<4;
|
|
|
|
/* Enable spu_bit if a delay is set. */
|
|
dev->spu_bit = delay ? COMM_SPU : 0;
|
|
/* If delay is zero, it has already been disabled, if the time is
|
|
* the same as the hardware was last programmed to, there is also
|
|
* nothing more to do. Compare with the recalculated value ms
|
|
* rather than del or delay which can have a different value.
|
|
*/
|
|
if (delay == 0 || ms == dev->spu_sleep)
|
|
return err;
|
|
|
|
err = ds_send_control(dev, COMM_SET_DURATION | COMM_IM, del);
|
|
if (err)
|
|
return err;
|
|
|
|
dev->spu_sleep = ms;
|
|
|
|
return err;
|
|
}
|
|
|
|
static int ds_touch_bit(struct ds_device *dev, u8 bit, u8 *tbit)
|
|
{
|
|
int err;
|
|
struct ds_status st;
|
|
|
|
err = ds_send_control(dev, COMM_BIT_IO | COMM_IM | (bit ? COMM_D : 0),
|
|
0);
|
|
if (err)
|
|
return err;
|
|
|
|
ds_wait_status(dev, &st);
|
|
|
|
err = ds_recv_data(dev, tbit, sizeof(*tbit));
|
|
if (err < 0)
|
|
return err;
|
|
|
|
return 0;
|
|
}
|
|
|
|
#if 0
|
|
static int ds_write_bit(struct ds_device *dev, u8 bit)
|
|
{
|
|
int err;
|
|
struct ds_status st;
|
|
|
|
/* Set COMM_ICP to write without a readback. Note, this will
|
|
* produce one time slot, a down followed by an up with COMM_D
|
|
* only determing the timing.
|
|
*/
|
|
err = ds_send_control(dev, COMM_BIT_IO | COMM_IM | COMM_ICP |
|
|
(bit ? COMM_D : 0), 0);
|
|
if (err)
|
|
return err;
|
|
|
|
ds_wait_status(dev, &st);
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static int ds_write_byte(struct ds_device *dev, u8 byte)
|
|
{
|
|
int err;
|
|
struct ds_status st;
|
|
u8 rbyte;
|
|
|
|
err = ds_send_control(dev, COMM_BYTE_IO | COMM_IM | dev->spu_bit, byte);
|
|
if (err)
|
|
return err;
|
|
|
|
if (dev->spu_bit)
|
|
msleep(dev->spu_sleep);
|
|
|
|
err = ds_wait_status(dev, &st);
|
|
if (err)
|
|
return err;
|
|
|
|
err = ds_recv_data(dev, &rbyte, sizeof(rbyte));
|
|
if (err < 0)
|
|
return err;
|
|
|
|
return !(byte == rbyte);
|
|
}
|
|
|
|
static int ds_read_byte(struct ds_device *dev, u8 *byte)
|
|
{
|
|
int err;
|
|
struct ds_status st;
|
|
|
|
err = ds_send_control(dev, COMM_BYTE_IO | COMM_IM , 0xff);
|
|
if (err)
|
|
return err;
|
|
|
|
ds_wait_status(dev, &st);
|
|
|
|
err = ds_recv_data(dev, byte, sizeof(*byte));
|
|
if (err < 0)
|
|
return err;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ds_read_block(struct ds_device *dev, u8 *buf, int len)
|
|
{
|
|
struct ds_status st;
|
|
int err;
|
|
|
|
if (len > 64*1024)
|
|
return -E2BIG;
|
|
|
|
memset(buf, 0xFF, len);
|
|
|
|
err = ds_send_data(dev, buf, len);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
err = ds_send_control(dev, COMM_BLOCK_IO | COMM_IM, len);
|
|
if (err)
|
|
return err;
|
|
|
|
ds_wait_status(dev, &st);
|
|
|
|
memset(buf, 0x00, len);
|
|
err = ds_recv_data(dev, buf, len);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int ds_write_block(struct ds_device *dev, u8 *buf, int len)
|
|
{
|
|
int err;
|
|
struct ds_status st;
|
|
|
|
err = ds_send_data(dev, buf, len);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
err = ds_send_control(dev, COMM_BLOCK_IO | COMM_IM | dev->spu_bit, len);
|
|
if (err)
|
|
return err;
|
|
|
|
if (dev->spu_bit)
|
|
msleep(dev->spu_sleep);
|
|
|
|
ds_wait_status(dev, &st);
|
|
|
|
err = ds_recv_data(dev, buf, len);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
return !(err == len);
|
|
}
|
|
|
|
static void ds9490r_search(void *data, struct w1_master *master,
|
|
u8 search_type, w1_slave_found_callback callback)
|
|
{
|
|
/* When starting with an existing id, the first id returned will
|
|
* be that device (if it is still on the bus most likely).
|
|
*
|
|
* If the number of devices found is less than or equal to the
|
|
* search_limit, that number of IDs will be returned. If there are
|
|
* more, search_limit IDs will be returned followed by a non-zero
|
|
* discrepency value.
|
|
*/
|
|
struct ds_device *dev = data;
|
|
int err;
|
|
u16 value, index;
|
|
struct ds_status st;
|
|
u8 st_buf[ST_SIZE];
|
|
int search_limit;
|
|
int found = 0;
|
|
int i;
|
|
|
|
/* DS18b20 spec, 13.16 ms per device, 75 per second, sleep for
|
|
* discovering 8 devices (1 bulk transfer and 1/2 FIFO size) at a time.
|
|
*/
|
|
const unsigned long jtime = msecs_to_jiffies(1000*8/75);
|
|
/* FIFO 128 bytes, bulk packet size 64, read a multiple of the
|
|
* packet size.
|
|
*/
|
|
u64 buf[2*64/8];
|
|
|
|
mutex_lock(&master->bus_mutex);
|
|
|
|
/* address to start searching at */
|
|
if (ds_send_data(dev, (u8 *)&master->search_id, 8) < 0)
|
|
goto search_out;
|
|
master->search_id = 0;
|
|
|
|
value = COMM_SEARCH_ACCESS | COMM_IM | COMM_RST | COMM_SM | COMM_F |
|
|
COMM_RTS;
|
|
search_limit = master->max_slave_count;
|
|
if (search_limit > 255)
|
|
search_limit = 0;
|
|
index = search_type | (search_limit << 8);
|
|
if (ds_send_control(dev, value, index) < 0)
|
|
goto search_out;
|
|
|
|
do {
|
|
schedule_timeout(jtime);
|
|
|
|
if (ds_recv_status_nodump(dev, &st, st_buf, sizeof(st_buf)) <
|
|
sizeof(st)) {
|
|
break;
|
|
}
|
|
|
|
if (st.data_in_buffer_status) {
|
|
/* Bulk in can receive partial ids, but when it does
|
|
* they fail crc and will be discarded anyway.
|
|
* That has only been seen when status in buffer
|
|
* is 0 and bulk is read anyway, so don't read
|
|
* bulk without first checking if status says there
|
|
* is data to read.
|
|
*/
|
|
err = ds_recv_data(dev, (u8 *)buf, sizeof(buf));
|
|
if (err < 0)
|
|
break;
|
|
for (i = 0; i < err/8; ++i) {
|
|
++found;
|
|
if (found <= search_limit)
|
|
callback(master, buf[i]);
|
|
/* can't know if there will be a discrepancy
|
|
* value after until the next id */
|
|
if (found == search_limit)
|
|
master->search_id = buf[i];
|
|
}
|
|
}
|
|
|
|
if (test_bit(W1_ABORT_SEARCH, &master->flags))
|
|
break;
|
|
} while (!(st.status & (ST_IDLE | ST_HALT)));
|
|
|
|
/* only continue the search if some weren't found */
|
|
if (found <= search_limit) {
|
|
master->search_id = 0;
|
|
} else if (!test_bit(W1_WARN_MAX_COUNT, &master->flags)) {
|
|
/* Only max_slave_count will be scanned in a search,
|
|
* but it will start where it left off next search
|
|
* until all ids are identified and then it will start
|
|
* over. A continued search will report the previous
|
|
* last id as the first id (provided it is still on the
|
|
* bus).
|
|
*/
|
|
dev_info(&dev->udev->dev, "%s: max_slave_count %d reached, "
|
|
"will continue next search.\n", __func__,
|
|
master->max_slave_count);
|
|
set_bit(W1_WARN_MAX_COUNT, &master->flags);
|
|
}
|
|
search_out:
|
|
mutex_unlock(&master->bus_mutex);
|
|
}
|
|
|
|
#if 0
|
|
static int ds_match_access(struct ds_device *dev, u64 init)
|
|
{
|
|
int err;
|
|
struct ds_status st;
|
|
|
|
err = ds_send_data(dev, (unsigned char *)&init, sizeof(init));
|
|
if (err)
|
|
return err;
|
|
|
|
ds_wait_status(dev, &st);
|
|
|
|
err = ds_send_control(dev, COMM_MATCH_ACCESS | COMM_IM | COMM_RST, 0x0055);
|
|
if (err)
|
|
return err;
|
|
|
|
ds_wait_status(dev, &st);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ds_set_path(struct ds_device *dev, u64 init)
|
|
{
|
|
int err;
|
|
struct ds_status st;
|
|
u8 buf[9];
|
|
|
|
memcpy(buf, &init, 8);
|
|
buf[8] = BRANCH_MAIN;
|
|
|
|
err = ds_send_data(dev, buf, sizeof(buf));
|
|
if (err)
|
|
return err;
|
|
|
|
ds_wait_status(dev, &st);
|
|
|
|
err = ds_send_control(dev, COMM_SET_PATH | COMM_IM | COMM_RST, 0);
|
|
if (err)
|
|
return err;
|
|
|
|
ds_wait_status(dev, &st);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#endif /* 0 */
|
|
|
|
static u8 ds9490r_touch_bit(void *data, u8 bit)
|
|
{
|
|
u8 ret;
|
|
struct ds_device *dev = data;
|
|
|
|
if (ds_touch_bit(dev, bit, &ret))
|
|
return 0;
|
|
|
|
return ret;
|
|
}
|
|
|
|
#if 0
|
|
static void ds9490r_write_bit(void *data, u8 bit)
|
|
{
|
|
struct ds_device *dev = data;
|
|
|
|
ds_write_bit(dev, bit);
|
|
}
|
|
|
|
static u8 ds9490r_read_bit(void *data)
|
|
{
|
|
struct ds_device *dev = data;
|
|
int err;
|
|
u8 bit = 0;
|
|
|
|
err = ds_touch_bit(dev, 1, &bit);
|
|
if (err)
|
|
return 0;
|
|
|
|
return bit & 1;
|
|
}
|
|
#endif
|
|
|
|
static void ds9490r_write_byte(void *data, u8 byte)
|
|
{
|
|
struct ds_device *dev = data;
|
|
|
|
ds_write_byte(dev, byte);
|
|
}
|
|
|
|
static u8 ds9490r_read_byte(void *data)
|
|
{
|
|
struct ds_device *dev = data;
|
|
int err;
|
|
u8 byte = 0;
|
|
|
|
err = ds_read_byte(dev, &byte);
|
|
if (err)
|
|
return 0;
|
|
|
|
return byte;
|
|
}
|
|
|
|
static void ds9490r_write_block(void *data, const u8 *buf, int len)
|
|
{
|
|
struct ds_device *dev = data;
|
|
|
|
ds_write_block(dev, (u8 *)buf, len);
|
|
}
|
|
|
|
static u8 ds9490r_read_block(void *data, u8 *buf, int len)
|
|
{
|
|
struct ds_device *dev = data;
|
|
int err;
|
|
|
|
err = ds_read_block(dev, buf, len);
|
|
if (err < 0)
|
|
return 0;
|
|
|
|
return len;
|
|
}
|
|
|
|
static u8 ds9490r_reset(void *data)
|
|
{
|
|
struct ds_device *dev = data;
|
|
int err;
|
|
|
|
err = ds_reset(dev);
|
|
if (err)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static u8 ds9490r_set_pullup(void *data, int delay)
|
|
{
|
|
struct ds_device *dev = data;
|
|
|
|
if (ds_set_pullup(dev, delay))
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ds_w1_init(struct ds_device *dev)
|
|
{
|
|
memset(&dev->master, 0, sizeof(struct w1_bus_master));
|
|
|
|
/* Reset the device as it can be in a bad state.
|
|
* This is necessary because a block write will wait for data
|
|
* to be placed in the output buffer and block any later
|
|
* commands which will keep accumulating and the device will
|
|
* not be idle. Another case is removing the ds2490 module
|
|
* while a bus search is in progress, somehow a few commands
|
|
* get through, but the input transfers fail leaving data in
|
|
* the input buffer. This will cause the next read to fail
|
|
* see the note in ds_recv_data.
|
|
*/
|
|
ds_reset_device(dev);
|
|
|
|
dev->master.data = dev;
|
|
dev->master.touch_bit = &ds9490r_touch_bit;
|
|
/* read_bit and write_bit in w1_bus_master are expected to set and
|
|
* sample the line level. For write_bit that means it is expected to
|
|
* set it to that value and leave it there. ds2490 only supports an
|
|
* individual time slot at the lowest level. The requirement from
|
|
* pulling the bus state down to reading the state is 15us, something
|
|
* that isn't realistic on the USB bus anyway.
|
|
dev->master.read_bit = &ds9490r_read_bit;
|
|
dev->master.write_bit = &ds9490r_write_bit;
|
|
*/
|
|
dev->master.read_byte = &ds9490r_read_byte;
|
|
dev->master.write_byte = &ds9490r_write_byte;
|
|
dev->master.read_block = &ds9490r_read_block;
|
|
dev->master.write_block = &ds9490r_write_block;
|
|
dev->master.reset_bus = &ds9490r_reset;
|
|
dev->master.set_pullup = &ds9490r_set_pullup;
|
|
dev->master.search = &ds9490r_search;
|
|
|
|
return w1_add_master_device(&dev->master);
|
|
}
|
|
|
|
static void ds_w1_fini(struct ds_device *dev)
|
|
{
|
|
w1_remove_master_device(&dev->master);
|
|
}
|
|
|
|
static int ds_probe(struct usb_interface *intf,
|
|
const struct usb_device_id *udev_id)
|
|
{
|
|
struct usb_device *udev = interface_to_usbdev(intf);
|
|
struct usb_endpoint_descriptor *endpoint;
|
|
struct usb_host_interface *iface_desc;
|
|
struct ds_device *dev;
|
|
int i, err, alt;
|
|
|
|
dev = kzalloc(sizeof(struct ds_device), GFP_KERNEL);
|
|
if (!dev) {
|
|
pr_info("Failed to allocate new DS9490R structure.\n");
|
|
return -ENOMEM;
|
|
}
|
|
dev->udev = usb_get_dev(udev);
|
|
if (!dev->udev) {
|
|
err = -ENOMEM;
|
|
goto err_out_free;
|
|
}
|
|
memset(dev->ep, 0, sizeof(dev->ep));
|
|
|
|
usb_set_intfdata(intf, dev);
|
|
|
|
err = usb_reset_configuration(dev->udev);
|
|
if (err) {
|
|
dev_err(&dev->udev->dev,
|
|
"Failed to reset configuration: err=%d.\n", err);
|
|
goto err_out_clear;
|
|
}
|
|
|
|
/* alternative 3, 1ms interrupt (greatly speeds search), 64 byte bulk */
|
|
alt = 3;
|
|
err = usb_set_interface(dev->udev,
|
|
intf->altsetting[alt].desc.bInterfaceNumber, alt);
|
|
if (err) {
|
|
dev_err(&dev->udev->dev, "Failed to set alternative setting %d "
|
|
"for %d interface: err=%d.\n", alt,
|
|
intf->altsetting[alt].desc.bInterfaceNumber, err);
|
|
goto err_out_clear;
|
|
}
|
|
|
|
iface_desc = &intf->altsetting[alt];
|
|
if (iface_desc->desc.bNumEndpoints != NUM_EP-1) {
|
|
pr_info("Num endpoints=%d. It is not DS9490R.\n",
|
|
iface_desc->desc.bNumEndpoints);
|
|
err = -EINVAL;
|
|
goto err_out_clear;
|
|
}
|
|
|
|
/*
|
|
* This loop doesn'd show control 0 endpoint,
|
|
* so we will fill only 1-3 endpoints entry.
|
|
*/
|
|
for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
|
|
endpoint = &iface_desc->endpoint[i].desc;
|
|
|
|
dev->ep[i+1] = endpoint->bEndpointAddress;
|
|
#if 0
|
|
printk("%d: addr=%x, size=%d, dir=%s, type=%x\n",
|
|
i, endpoint->bEndpointAddress, le16_to_cpu(endpoint->wMaxPacketSize),
|
|
(endpoint->bEndpointAddress & USB_DIR_IN)?"IN":"OUT",
|
|
endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK);
|
|
#endif
|
|
}
|
|
|
|
err = ds_w1_init(dev);
|
|
if (err)
|
|
goto err_out_clear;
|
|
|
|
mutex_lock(&ds_mutex);
|
|
list_add_tail(&dev->ds_entry, &ds_devices);
|
|
mutex_unlock(&ds_mutex);
|
|
|
|
return 0;
|
|
|
|
err_out_clear:
|
|
usb_set_intfdata(intf, NULL);
|
|
usb_put_dev(dev->udev);
|
|
err_out_free:
|
|
kfree(dev);
|
|
return err;
|
|
}
|
|
|
|
static void ds_disconnect(struct usb_interface *intf)
|
|
{
|
|
struct ds_device *dev;
|
|
|
|
dev = usb_get_intfdata(intf);
|
|
if (!dev)
|
|
return;
|
|
|
|
mutex_lock(&ds_mutex);
|
|
list_del(&dev->ds_entry);
|
|
mutex_unlock(&ds_mutex);
|
|
|
|
ds_w1_fini(dev);
|
|
|
|
usb_set_intfdata(intf, NULL);
|
|
|
|
usb_put_dev(dev->udev);
|
|
kfree(dev);
|
|
}
|
|
|
|
module_usb_driver(ds_driver);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Evgeniy Polyakov <zbr@ioremap.net>");
|
|
MODULE_DESCRIPTION("DS2490 USB <-> W1 bus master driver (DS9490*)");
|