diff options
| -rw-r--r-- | drivers/w1/Kconfig | 16 | ||||
| -rw-r--r-- | drivers/w1/Makefile | 7 | ||||
| -rw-r--r-- | drivers/w1/ds_w1_bridge.c | 24 | ||||
| -rw-r--r-- | drivers/w1/dscore.c | 161 | ||||
| -rw-r--r-- | drivers/w1/dscore.h | 10 | ||||
| -rw-r--r-- | drivers/w1/w1.c | 302 | ||||
| -rw-r--r-- | drivers/w1/w1.h | 22 | ||||
| -rw-r--r-- | drivers/w1/w1_ds2433.c | 327 | ||||
| -rw-r--r-- | drivers/w1/w1_family.c | 11 | ||||
| -rw-r--r-- | drivers/w1/w1_family.h | 7 | ||||
| -rw-r--r-- | drivers/w1/w1_int.c | 26 | ||||
| -rw-r--r-- | drivers/w1/w1_io.c | 24 | ||||
| -rw-r--r-- | drivers/w1/w1_io.h | 1 | ||||
| -rw-r--r-- | drivers/w1/w1_netlink.c | 26 | ||||
| -rw-r--r-- | drivers/w1/w1_netlink.h | 2 | ||||
| -rw-r--r-- | drivers/w1/w1_smem.c | 49 | ||||
| -rw-r--r-- | drivers/w1/w1_therm.c | 47 | ||||
| -rw-r--r-- | include/linux/crc16.h | 44 | ||||
| -rw-r--r-- | lib/Kconfig | 8 | ||||
| -rw-r--r-- | lib/Makefile | 3 | ||||
| -rw-r--r-- | lib/crc16.c | 67 |
21 files changed, 871 insertions, 313 deletions
diff --git a/drivers/w1/Kconfig b/drivers/w1/Kconfig index 711b90903e7b..9a1e00dd3e02 100644 --- a/drivers/w1/Kconfig +++ b/drivers/w1/Kconfig @@ -54,4 +54,20 @@ config W1_SMEM Say Y here if you want to connect 1-wire simple 64bit memory rom(ds2401/ds2411/ds1990*) to you wire. +config W1_DS2433 + tristate "4kb EEPROM family support (DS2433)" + depends on W1 + help + Say Y here if you want to use a 1-wire + 4kb EEPROM family device (DS2433). + +config W1_DS2433_CRC + bool "Protect DS2433 data with a CRC16" + depends on W1_DS2433 + select CRC16 + help + Say Y here to protect DS2433 data with a CRC16. + Each block has 30 bytes of data and a two byte CRC16. + Full block writes are only allowed if the CRC is valid. + endmenu diff --git a/drivers/w1/Makefile b/drivers/w1/Makefile index 80725c348e70..01fb54391470 100644 --- a/drivers/w1/Makefile +++ b/drivers/w1/Makefile @@ -6,6 +6,10 @@ ifneq ($(CONFIG_NET), y) EXTRA_CFLAGS += -DNETLINK_DISABLED endif +ifeq ($(CONFIG_W1_DS2433_CRC), y) +EXTRA_CFLAGS += -DCONFIG_W1_F23_CRC +endif + obj-$(CONFIG_W1) += wire.o wire-objs := w1.o w1_int.o w1_family.o w1_netlink.o w1_io.o @@ -13,8 +17,9 @@ obj-$(CONFIG_W1_MATROX) += matrox_w1.o obj-$(CONFIG_W1_THERM) += w1_therm.o obj-$(CONFIG_W1_SMEM) += w1_smem.o -obj-$(CONFIG_W1_DS9490) += ds9490r.o +obj-$(CONFIG_W1_DS9490) += ds9490r.o ds9490r-objs := dscore.o obj-$(CONFIG_W1_DS9490_BRIDGE) += ds_w1_bridge.o +obj-$(CONFIG_W1_DS2433) += w1_ds2433.o diff --git a/drivers/w1/ds_w1_bridge.c b/drivers/w1/ds_w1_bridge.c index 7bddd8ac7d7f..a79d16d5666f 100644 --- a/drivers/w1/ds_w1_bridge.c +++ b/drivers/w1/ds_w1_bridge.c @@ -1,8 +1,8 @@ /* - * ds_w1_bridge.c + * ds_w1_bridge.c * * Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru> - * + * * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by @@ -25,7 +25,7 @@ #include "../w1/w1.h" #include "../w1/w1_int.h" #include "dscore.h" - + static struct ds_device *ds_dev; static struct w1_bus_master *ds_bus_master; @@ -120,7 +120,7 @@ static u8 ds9490r_reset(unsigned long data) static int __devinit ds_w1_init(void) { int err; - + ds_bus_master = kmalloc(sizeof(*ds_bus_master), GFP_KERNEL); if (!ds_bus_master) { printk(KERN_ERR "Failed to allocate DS9490R USB<->W1 bus_master structure.\n"); @@ -136,14 +136,14 @@ static int __devinit ds_w1_init(void) memset(ds_bus_master, 0, sizeof(*ds_bus_master)); - ds_bus_master->data = (unsigned long)ds_dev; - ds_bus_master->touch_bit = &ds9490r_touch_bit; - ds_bus_master->read_bit = &ds9490r_read_bit; - ds_bus_master->write_bit = &ds9490r_write_bit; - ds_bus_master->read_byte = &ds9490r_read_byte; - ds_bus_master->write_byte = &ds9490r_write_byte; - ds_bus_master->read_block = &ds9490r_read_block; - ds_bus_master->write_block = &ds9490r_write_block; + ds_bus_master->data = (unsigned long)ds_dev; + ds_bus_master->touch_bit = &ds9490r_touch_bit; + ds_bus_master->read_bit = &ds9490r_read_bit; + ds_bus_master->write_bit = &ds9490r_write_bit; + ds_bus_master->read_byte = &ds9490r_read_byte; + ds_bus_master->write_byte = &ds9490r_write_byte; + ds_bus_master->read_block = &ds9490r_read_block; + ds_bus_master->write_block = &ds9490r_write_block; ds_bus_master->reset_bus = &ds9490r_reset; err = w1_add_master_device(ds_bus_master); diff --git a/drivers/w1/dscore.c b/drivers/w1/dscore.c index eee6644d33d6..15fb250451e5 100644 --- a/drivers/w1/dscore.c +++ b/drivers/w1/dscore.c @@ -1,8 +1,8 @@ /* - * dscore.c + * dscore.c * * Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru> - * + * * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by @@ -32,19 +32,16 @@ static struct usb_device_id ds_id_table [] = { }; MODULE_DEVICE_TABLE(usb, ds_id_table); -int ds_probe(struct usb_interface *, const struct usb_device_id *); -void ds_disconnect(struct usb_interface *); +static int ds_probe(struct usb_interface *, const struct usb_device_id *); +static void ds_disconnect(struct usb_interface *); int ds_touch_bit(struct ds_device *, u8, u8 *); int ds_read_byte(struct ds_device *, u8 *); int ds_read_bit(struct ds_device *, u8 *); int ds_write_byte(struct ds_device *, u8); int ds_write_bit(struct ds_device *, u8); -int ds_start_pulse(struct ds_device *, int); -int ds_set_speed(struct ds_device *, int); +static int ds_start_pulse(struct ds_device *, int); int ds_reset(struct ds_device *, struct ds_status *); -int ds_detect(struct ds_device *, struct ds_status *); -int ds_stop_pulse(struct ds_device *, int); struct ds_device * ds_get_device(void); void ds_put_device(struct ds_device *); @@ -79,11 +76,11 @@ void ds_put_device(struct ds_device *dev) static int ds_send_control_cmd(struct ds_device *dev, u16 value, u16 index) { int err; - - err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, dev->ep[EP_CONTROL]), + + err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, dev->ep[EP_CONTROL]), CONTROL_CMD, 0x40, value, index, NULL, 0, 1000); if (err < 0) { - printk(KERN_ERR "Failed to send command control message %x.%x: err=%d.\n", + printk(KERN_ERR "Failed to send command control message %x.%x: err=%d.\n", value, index, err); return err; } @@ -94,11 +91,11 @@ static int ds_send_control_cmd(struct ds_device *dev, u16 value, u16 index) static int ds_send_control_mode(struct ds_device *dev, u16 value, u16 index) { int err; - - err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, dev->ep[EP_CONTROL]), + + err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, dev->ep[EP_CONTROL]), MODE_CMD, 0x40, value, index, NULL, 0, 1000); if (err < 0) { - printk(KERN_ERR "Failed to send mode control message %x.%x: err=%d.\n", + printk(KERN_ERR "Failed to send mode control message %x.%x: err=%d.\n", value, index, err); return err; } @@ -109,11 +106,11 @@ static int ds_send_control_mode(struct ds_device *dev, u16 value, u16 index) static int ds_send_control(struct ds_device *dev, u16 value, u16 index) { int err; - - err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, dev->ep[EP_CONTROL]), + + err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, dev->ep[EP_CONTROL]), COMM_CMD, 0x40, value, index, NULL, 0, 1000); if (err < 0) { - printk(KERN_ERR "Failed to send control message %x.%x: err=%d.\n", + printk(KERN_ERR "Failed to send control message %x.%x: err=%d.\n", value, index, err); return err; } @@ -126,19 +123,20 @@ static inline void ds_dump_status(unsigned char *buf, unsigned char *str, int of printk("%45s: %8x\n", str, buf[off]); } -int ds_recv_status_nodump(struct ds_device *dev, struct ds_status *st, unsigned char *buf, int size) +static int ds_recv_status_nodump(struct ds_device *dev, struct ds_status *st, + unsigned char *buf, int size) { int count, err; - + memset(st, 0, sizeof(st)); - + count = 0; err = usb_bulk_msg(dev->udev, usb_rcvbulkpipe(dev->udev, dev->ep[EP_STATUS]), buf, size, &count, 100); if (err < 0) { printk(KERN_ERR "Failed to read 1-wire data from 0x%x: err=%d.\n", dev->ep[EP_STATUS], err); return err; } - + if (count >= sizeof(*st)) memcpy(st, buf, sizeof(*st)); @@ -149,13 +147,13 @@ static int ds_recv_status(struct ds_device *dev, struct ds_status *st) { unsigned char buf[64]; int count, err = 0, i; - + memcpy(st, buf, sizeof(*st)); - + count = ds_recv_status_nodump(dev, st, buf, sizeof(buf)); if (count < 0) return err; - + printk("0x%x: count=%d, status: ", dev->ep[EP_STATUS], count); for (i=0; i<count; ++i) printk("%02x ", buf[i]); @@ -199,7 +197,7 @@ static int ds_recv_status(struct ds_device *dev, struct ds_status *st) return err; } #endif - + return err; } @@ -207,9 +205,9 @@ static int ds_recv_data(struct ds_device *dev, unsigned char *buf, int size) { int count, err; struct ds_status st; - + count = 0; - err = usb_bulk_msg(dev->udev, usb_rcvbulkpipe(dev->udev, dev->ep[EP_DATA_IN]), + err = usb_bulk_msg(dev->udev, usb_rcvbulkpipe(dev->udev, dev->ep[EP_DATA_IN]), buf, size, &count, 1000); if (err < 0) { printk(KERN_INFO "Clearing ep0x%x.\n", dev->ep[EP_DATA_IN]); @@ -234,7 +232,7 @@ static int ds_recv_data(struct ds_device *dev, unsigned char *buf, int size) static int ds_send_data(struct ds_device *dev, unsigned char *buf, int len) { int count, err; - + count = 0; err = usb_bulk_msg(dev->udev, usb_sndbulkpipe(dev->udev, dev->ep[EP_DATA_OUT]), buf, len, &count, 1000); if (err < 0) { @@ -245,12 +243,14 @@ static int ds_send_data(struct ds_device *dev, unsigned char *buf, int len) return err; } +#if 0 + int ds_stop_pulse(struct ds_device *dev, int limit) { struct ds_status st; int count = 0, err = 0; u8 buf[0x20]; - + do { err = ds_send_control(dev, CTL_HALT_EXE_IDLE, 0); if (err) @@ -275,7 +275,7 @@ int ds_stop_pulse(struct ds_device *dev, int limit) int ds_detect(struct ds_device *dev, struct ds_status *st) { int err; - + err = ds_send_control_cmd(dev, CTL_RESET_DEVICE, 0); if (err) return err; @@ -283,11 +283,11 @@ int ds_detect(struct ds_device *dev, struct ds_status *st) err = ds_send_control(dev, COMM_SET_DURATION | COMM_IM, 0); if (err) return err; - + err = ds_send_control(dev, COMM_SET_DURATION | COMM_IM | COMM_TYPE, 0x40); if (err) return err; - + err = ds_send_control_mode(dev, MOD_PULSE_EN, PULSE_PROG); if (err) return err; @@ -297,7 +297,9 @@ int ds_detect(struct ds_device *dev, struct ds_status *st) return err; } -int ds_wait_status(struct ds_device *dev, struct ds_status *st) +#endif /* 0 */ + +static int ds_wait_status(struct ds_device *dev, struct ds_status *st) { u8 buf[0x20]; int err, count = 0; @@ -305,7 +307,7 @@ int ds_wait_status(struct ds_device *dev, struct ds_status *st) do { err = ds_recv_status_nodump(dev, st, buf, sizeof(buf)); #if 0 - if (err >= 0) { + if (err >= 0) { int i; printk("0x%x: count=%d, status: ", dev->ep[EP_STATUS], err); for (i=0; i<err; ++i) @@ -319,10 +321,8 @@ int ds_wait_status(struct ds_device *dev, struct ds_status *st) if (((err > 16) && (buf[0x10] & 0x01)) || count >= 100 || err < 0) { ds_recv_status(dev, st); return -1; - } - else { + } else return 0; - } } int ds_reset(struct ds_device *dev, struct ds_status *st) @@ -345,6 +345,7 @@ int ds_reset(struct ds_device *dev, struct ds_status *st) return 0; } +#if 0 int ds_set_speed(struct ds_device *dev, int speed) { int err; @@ -356,20 +357,21 @@ int ds_set_speed(struct ds_device *dev, int speed) speed = SPEED_FLEXIBLE; speed &= 0xff; - + err = ds_send_control_mode(dev, MOD_1WIRE_SPEED, speed); if (err) return err; return err; } +#endif /* 0 */ -int ds_start_pulse(struct ds_device *dev, int delay) +static int ds_start_pulse(struct ds_device *dev, int delay) { int err; u8 del = 1 + (u8)(delay >> 4); struct ds_status st; - + #if 0 err = ds_stop_pulse(dev, 10); if (err) @@ -390,7 +392,7 @@ int ds_start_pulse(struct ds_device *dev, int delay) mdelay(delay); ds_wait_status(dev, &st); - + return err; } @@ -400,7 +402,7 @@ int ds_touch_bit(struct ds_device *dev, u8 bit, u8 *tbit) struct ds_status st; u16 value = (COMM_BIT_IO | COMM_IM) | ((bit) ? COMM_D : 0); u16 cmd; - + err = ds_send_control(dev, value, 0); if (err) return err; @@ -430,7 +432,7 @@ int ds_write_bit(struct ds_device *dev, u8 bit) { 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; @@ -445,7 +447,7 @@ 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 | COMM_SPU, byte); if (err) return err; @@ -453,11 +455,11 @@ int ds_write_byte(struct ds_device *dev, u8 byte) err = ds_wait_status(dev, &st); if (err) return err; - + err = ds_recv_data(dev, &rbyte, sizeof(rbyte)); if (err < 0) return err; - + ds_start_pulse(dev, PULLUP_PULSE_DURATION); return !(byte == rbyte); @@ -470,11 +472,11 @@ int ds_read_bit(struct ds_device *dev, u8 *bit) err = ds_send_control_mode(dev, MOD_PULSE_EN, PULSE_SPUE); if (err) return err; - + err = ds_send_control(dev, COMM_BIT_IO | COMM_IM | COMM_SPU | COMM_D, 0); if (err) return err; - + err = ds_recv_data(dev, bit, sizeof(*bit)); if (err < 0) return err; @@ -492,7 +494,7 @@ int ds_read_byte(struct ds_device *dev, u8 *byte) return err; ds_wait_status(dev, &st); - + err = ds_recv_data(dev, byte, sizeof(*byte)); if (err < 0) return err; @@ -509,17 +511,17 @@ int ds_read_block(struct ds_device *dev, u8 *buf, int len) 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 | COMM_SPU, len); if (err) return err; ds_wait_status(dev, &st); - + memset(buf, 0x00, len); err = ds_recv_data(dev, buf, len); @@ -530,11 +532,11 @@ 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; - + ds_wait_status(dev, &st); err = ds_send_control(dev, COMM_BLOCK_IO | COMM_IM | COMM_SPU, len); @@ -548,10 +550,12 @@ int ds_write_block(struct ds_device *dev, u8 *buf, int len) return err; ds_start_pulse(dev, PULLUP_PULSE_DURATION); - + return !(err == len); } +#if 0 + int ds_search(struct ds_device *dev, u64 init, u64 *buf, u8 id_number, int conditional_search) { int err; @@ -559,11 +563,11 @@ int ds_search(struct ds_device *dev, u64 init, u64 *buf, u8 id_number, int condi struct ds_status st; memset(buf, 0, sizeof(buf)); - + err = ds_send_data(ds_dev, (unsigned char *)&init, 8); if (err) return err; - + ds_wait_status(ds_dev, &st); value = COMM_SEARCH_ACCESS | COMM_IM | COMM_SM | COMM_F | COMM_RTS; @@ -589,7 +593,7 @@ int ds_match_access(struct ds_device *dev, u64 init) 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); @@ -609,11 +613,11 @@ int ds_set_path(struct ds_device *dev, u64 init) 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); @@ -625,7 +629,10 @@ int ds_set_path(struct ds_device *dev, u64 init) return 0; } -int ds_probe(struct usb_interface *intf, const struct usb_device_id *udev_id) +#endif /* 0 */ + +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; @@ -653,7 +660,7 @@ int ds_probe(struct usb_interface *intf, const struct usb_device_id *udev_id) printk(KERN_ERR "Failed to reset configuration: err=%d.\n", err); return err; } - + iface_desc = &intf->altsetting[0]; if (iface_desc->desc.bNumEndpoints != NUM_EP-1) { printk(KERN_INFO "Num endpoints=%d. It is not DS9490R.\n", iface_desc->desc.bNumEndpoints); @@ -662,37 +669,37 @@ int ds_probe(struct usb_interface *intf, const struct usb_device_id *udev_id) atomic_set(&ds_dev->refcnt, 0); memset(ds_dev->ep, 0, sizeof(ds_dev->ep)); - + /* - * This loop doesn'd show control 0 endpoint, + * 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; ds_dev->ep[i+1] = endpoint->bEndpointAddress; - + 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); } - + #if 0 { int err, i; u64 buf[3]; u64 init=0xb30000002078ee81ull; struct ds_status st; - + ds_reset(ds_dev, &st); err = ds_search(ds_dev, init, buf, 3, 0); if (err < 0) return err; for (i=0; i<err; ++i) printk("%d: %llx\n", i, buf[i]); - - printk("Resetting...\n"); + + printk("Resetting...\n"); ds_reset(ds_dev, &st); printk("Setting path for %llx.\n", init); err = ds_set_path(ds_dev, init); @@ -707,12 +714,12 @@ int ds_probe(struct usb_interface *intf, const struct usb_device_id *udev_id) err = ds_search(ds_dev, init, buf, 3, 0); printk("ds_search() returned %d\n", err); - + if (err < 0) return err; for (i=0; i<err; ++i) printk("%d: %llx\n", i, buf[i]); - + return 0; } #endif @@ -720,10 +727,10 @@ int ds_probe(struct usb_interface *intf, const struct usb_device_id *udev_id) return 0; } -void ds_disconnect(struct usb_interface *intf) +static void ds_disconnect(struct usb_interface *intf) { struct ds_device *dev; - + dev = usb_get_intfdata(intf); usb_set_intfdata(intf, NULL); @@ -740,7 +747,7 @@ void ds_disconnect(struct usb_interface *intf) ds_dev = NULL; } -int ds_init(void) +static int ds_init(void) { int err; @@ -753,7 +760,7 @@ int ds_init(void) return 0; } -void ds_fini(void) +static void ds_fini(void) { usb_deregister(&ds_driver); } @@ -776,8 +783,8 @@ EXPORT_SYMBOL(ds_get_device); EXPORT_SYMBOL(ds_put_device); /* - * This functions can be used for EEPROM programming, - * when driver will be included into mainline this will + * This functions can be used for EEPROM programming, + * when driver will be included into mainline this will * require uncommenting. */ #if 0 diff --git a/drivers/w1/dscore.h b/drivers/w1/dscore.h index 9c767ef4ac24..6cf5671d6ebe 100644 --- a/drivers/w1/dscore.h +++ b/drivers/w1/dscore.h @@ -1,8 +1,8 @@ /* - * dscore.h + * dscore.h * * Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru> - * + * * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by @@ -122,7 +122,7 @@ struct ds_device { - struct usb_device *udev; + struct usb_device *udev; struct usb_interface *intf; int ep[NUM_EP]; @@ -156,11 +156,7 @@ int ds_read_byte(struct ds_device *, u8 *); int ds_read_bit(struct ds_device *, u8 *); int ds_write_byte(struct ds_device *, u8); int ds_write_bit(struct ds_device *, u8); -int ds_start_pulse(struct ds_device *, int); -int ds_set_speed(struct ds_device *, int); int ds_reset(struct ds_device *, struct ds_status *); -int ds_detect(struct ds_device *, struct ds_status *); -int ds_stop_pulse(struct ds_device *, int); struct ds_device * ds_get_device(void); void ds_put_device(struct ds_device *); int ds_write_block(struct ds_device *, u8 *, int); diff --git a/drivers/w1/w1.c b/drivers/w1/w1.c index 0bbf029b1ef1..1b6b74c116a9 100644 --- a/drivers/w1/w1.c +++ b/drivers/w1/w1.c @@ -45,10 +45,12 @@ MODULE_AUTHOR("Evgeniy Polyakov <johnpol@2ka.mipt.ru>"); MODULE_DESCRIPTION("Driver for 1-wire Dallas network protocol."); static int w1_timeout = 10; +static int w1_control_timeout = 1; int w1_max_slave_count = 10; int w1_max_slave_ttl = 10; module_param_named(timeout, w1_timeout, int, 0); +module_param_named(control_timeout, w1_control_timeout, int, 0); module_param_named(max_slave_count, w1_max_slave_count, int, 0); module_param_named(slave_ttl, w1_max_slave_ttl, int, 0); @@ -59,19 +61,6 @@ static pid_t control_thread; static int control_needs_exit; static DECLARE_COMPLETION(w1_control_complete); -/* stuff for the default family */ -static ssize_t w1_famdefault_read_name(struct device *dev, struct device_attribute *attr, char *buf) -{ - struct w1_slave *sl = container_of(dev, struct w1_slave, dev); - return(sprintf(buf, "%s\n", sl->name)); -} -static struct w1_family_ops w1_default_fops = { - .rname = &w1_famdefault_read_name, -}; -static struct w1_family w1_default_family = { - .fops = &w1_default_fops, -}; - static int w1_master_match(struct device *dev, struct device_driver *drv) { return 1; @@ -82,73 +71,116 @@ static int w1_master_probe(struct device *dev) return -ENODEV; } -static int w1_master_remove(struct device *dev) -{ - return 0; -} - static void w1_master_release(struct device *dev) { - struct w1_master *md = container_of(dev, struct w1_master, dev); + struct w1_master *md = dev_to_w1_master(dev); - complete(&md->dev_released); + dev_dbg(dev, "%s: Releasing %s.\n", __func__, md->name); + + if (md->nls && md->nls->sk_socket) + sock_release(md->nls->sk_socket); + memset(md, 0, sizeof(struct w1_master) + sizeof(struct w1_bus_master)); + kfree(md); } static void w1_slave_release(struct device *dev) { - struct w1_slave *sl = container_of(dev, struct w1_slave, dev); + struct w1_slave *sl = dev_to_w1_slave(dev); + + dev_dbg(dev, "%s: Releasing %s.\n", __func__, sl->name); + + while (atomic_read(&sl->refcnt)) { + dev_dbg(dev, "Waiting for %s to become free: refcnt=%d.\n", + sl->name, atomic_read(&sl->refcnt)); + if (msleep_interruptible(1000)) + flush_signals(current); + } + + w1_family_put(sl->family); + sl->master->slave_count--; - complete(&sl->dev_released); + complete(&sl->released); } -static ssize_t w1_default_read_name(struct device *dev, struct device_attribute *attr, char *buf) +static ssize_t w1_slave_read_name(struct device *dev, struct device_attribute *attr, char *buf) { - return sprintf(buf, "No family registered.\n"); + struct w1_slave *sl = dev_to_w1_slave(dev); + + return sprintf(buf, "%s\n", sl->name); } -static ssize_t w1_default_read_bin(struct kobject *kobj, char *buf, loff_t off, - size_t count) +static ssize_t w1_slave_read_id(struct kobject *kobj, char *buf, loff_t off, size_t count) { - return sprintf(buf, "No family registered.\n"); + struct w1_slave *sl = kobj_to_w1_slave(kobj); + + atomic_inc(&sl->refcnt); + if (off > 8) { + count = 0; + } else { + if (off + count > 8) + count = 8 - off; + + memcpy(buf, (u8 *)&sl->reg_num, count); + } + atomic_dec(&sl->refcnt); + + return count; } -static struct device_attribute w1_slave_attribute = - __ATTR(name, S_IRUGO, w1_default_read_name, NULL); - -static struct bin_attribute w1_slave_bin_attribute = { - .attr = { - .name = "w1_slave", - .mode = S_IRUGO, - .owner = THIS_MODULE, - }, - .size = W1_SLAVE_DATA_SIZE, - .read = &w1_default_read_bin, +static struct device_attribute w1_slave_attr_name = + __ATTR(name, S_IRUGO, w1_slave_read_name, NULL); + +static struct bin_attribute w1_slave_attr_bin_id = { + .attr = { + .name = "id", + .mode = S_IRUGO, + .owner = THIS_MODULE, + }, + .size = 8, + .read = w1_slave_read_id, }; +/* Default family */ +static struct w1_family w1_default_family; + +static int w1_hotplug(struct device *dev, char **envp, int num_envp, char *buffer, int buffer_size); static struct bus_type w1_bus_type = { .name = "w1", .match = w1_master_match, + .hotplug = w1_hotplug, }; -struct device_driver w1_driver = { - .name = "w1_driver", +struct device_driver w1_master_driver = { + .name = "w1_master_driver", .bus = &w1_bus_type, .probe = w1_master_probe, - .remove = w1_master_remove, }; -struct device w1_device = { +struct device w1_master_device = { .parent = NULL, .bus = &w1_bus_type, .bus_id = "w1 bus master", - .driver = &w1_driver, + .driver = &w1_master_driver, .release = &w1_master_release }; +struct device_driver w1_slave_driver = { + .name = "w1_slave_driver", + .bus = &w1_bus_type, +}; + +struct device w1_slave_device = { + .parent = NULL, + .bus = &w1_bus_type, + .bus_id = "w1 bus slave", + .driver = &w1_slave_driver, + .release = &w1_slave_release +}; + static ssize_t w1_master_attribute_show_name(struct device *dev, struct device_attribute *attr, char *buf) { - struct w1_master *md = container_of(dev, struct w1_master, dev); + struct w1_master *md = dev_to_w1_master(dev); ssize_t count; if (down_interruptible (&md->mutex)) @@ -165,7 +197,7 @@ static ssize_t w1_master_attribute_store_search(struct device * dev, struct device_attribute *attr, const char * buf, size_t count) { - struct w1_master *md = container_of(dev, struct w1_master, dev); + struct w1_master *md = dev_to_w1_master(dev); if (down_interruptible (&md->mutex)) return -EBUSY; @@ -181,7 +213,7 @@ static ssize_t w1_master_attribute_show_search(struct device *dev, struct device_attribute *attr, char *buf) { - struct w1_master *md = container_of(dev, struct w1_master, dev); + struct w1_master *md = dev_to_w1_master(dev); ssize_t count; if (down_interruptible (&md->mutex)) @@ -196,7 +228,7 @@ static ssize_t w1_master_attribute_show_search(struct device *dev, static ssize_t w1_master_attribute_show_pointer(struct device *dev, struct device_attribute *attr, char *buf) { - struct w1_master *md = container_of(dev, struct w1_master, dev); + struct w1_master *md = dev_to_w1_master(dev); ssize_t count; if (down_interruptible(&md->mutex)) @@ -217,7 +249,7 @@ static ssize_t w1_master_attribute_show_timeout(struct device *dev, struct devic static ssize_t w1_master_attribute_show_max_slave_count(struct device *dev, struct device_attribute *attr, char *buf) { - struct w1_master *md = container_of(dev, struct w1_master, dev); + struct w1_master *md = dev_to_w1_master(dev); ssize_t count; if (down_interruptible(&md->mutex)) @@ -231,7 +263,7 @@ static ssize_t w1_master_attribute_show_max_slave_count(struct device *dev, stru static ssize_t w1_master_attribute_show_attempts(struct device *dev, struct device_attribute *attr, char *buf) { - struct w1_master *md = container_of(dev, struct w1_master, dev); + struct w1_master *md = dev_to_w1_master(dev); ssize_t count; if (down_interruptible(&md->mutex)) @@ -245,7 +277,7 @@ static ssize_t w1_master_attribute_show_attempts(struct device *dev, struct devi static ssize_t w1_master_attribute_show_slave_count(struct device *dev, struct device_attribute *attr, char *buf) { - struct w1_master *md = container_of(dev, struct w1_master, dev); + struct w1_master *md = dev_to_w1_master(dev); ssize_t count; if (down_interruptible(&md->mutex)) @@ -259,7 +291,7 @@ static ssize_t w1_master_attribute_show_slave_count(struct device *dev, struct d static ssize_t w1_master_attribute_show_slaves(struct device *dev, struct device_attribute *attr, char *buf) { - struct w1_master *md = container_of(dev, struct w1_master, dev); + struct w1_master *md = dev_to_w1_master(dev); int c = PAGE_SIZE; if (down_interruptible(&md->mutex)) @@ -329,12 +361,55 @@ void w1_destroy_master_attributes(struct w1_master *master) sysfs_remove_group(&master->dev.kobj, &w1_master_defattr_group); } +#ifdef CONFIG_HOTPLUG +static int w1_hotplug(struct device *dev, char **envp, int num_envp, char *buffer, int buffer_size) +{ + struct w1_master *md = NULL; + struct w1_slave *sl = NULL; + char *event_owner, *name; + int err, cur_index=0, cur_len=0; + + if (dev->driver == &w1_master_driver) { + md = container_of(dev, struct w1_master, dev); + event_owner = "master"; + name = md->name; + } else if (dev->driver == &w1_slave_driver) { + sl = container_of(dev, struct w1_slave, dev); + event_owner = "slave"; + name = sl->name; + } else { + dev_dbg(dev, "Unknown hotplug event.\n"); + return -EINVAL; + } + + dev_dbg(dev, "Hotplug event for %s %s, bus_id=%s.\n", event_owner, name, dev->bus_id); + + if (dev->driver != &w1_slave_driver || !sl) + return 0; + + err = add_hotplug_env_var(envp, num_envp, &cur_index, buffer, buffer_size, &cur_len, "W1_FID=%02X", sl->reg_num.family); + if (err) + return err; + + err = add_hotplug_env_var(envp, num_envp, &cur_index, buffer, buffer_size, &cur_len, "W1_SLAVE_ID=%024LX", (u64)sl->reg_num.id); + if (err) + return err; + + return 0; +}; +#else +static int w1_hotplug(struct device *dev, char **envp, int num_envp, char *buffer, int buffer_size) +{ + return 0; +} +#endif + static int __w1_attach_slave_device(struct w1_slave *sl) { int err; sl->dev.parent = &sl->master->dev; - sl->dev.driver = sl->master->driver; + sl->dev.driver = &w1_slave_driver; sl->dev.bus = &w1_bus_type; sl->dev.release = &w1_slave_release; @@ -347,8 +422,7 @@ static int __w1_attach_slave_device(struct w1_slave *sl) (unsigned int) sl->reg_num.family, (unsigned long long) sl->reg_num.id); - dev_dbg(&sl->dev, "%s: registering %s.\n", __func__, - &sl->dev.bus_id[0]); + dev_dbg(&sl->dev, "%s: registering %s as %p.\n", __func__, &sl->dev.bus_id[0]); err = device_register(&sl->dev); if (err < 0) { @@ -358,36 +432,44 @@ static int __w1_attach_slave_device(struct w1_slave *sl) return err; } - memcpy(&sl->attr_bin, &w1_slave_bin_attribute, sizeof(sl->attr_bin)); - memcpy(&sl->attr_name, &w1_slave_attribute, sizeof(sl->attr_name)); - - sl->attr_bin.read = sl->family->fops->rbin; - sl->attr_name.show = sl->family->fops->rname; + /* Create "name" entry */ + err = device_create_file(&sl->dev, &w1_slave_attr_name); + if (err < 0) { + dev_err(&sl->dev, + "sysfs file creation for [%s] failed. err=%d\n", + sl->dev.bus_id, err); + goto out_unreg; + } - err = device_create_file(&sl->dev, &sl->attr_name); + /* Create "id" entry */ + err = sysfs_create_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id); if (err < 0) { dev_err(&sl->dev, "sysfs file creation for [%s] failed. err=%d\n", sl->dev.bus_id, err); - device_unregister(&sl->dev); - return err; + goto out_rem1; } - if ( sl->attr_bin.read ) { - err = sysfs_create_bin_file(&sl->dev.kobj, &sl->attr_bin); - if (err < 0) { - dev_err(&sl->dev, - "sysfs file creation for [%s] failed. err=%d\n", - sl->dev.bus_id, err); - device_remove_file(&sl->dev, &sl->attr_name); - device_unregister(&sl->dev); - return err; - } + /* if the family driver needs to initialize something... */ + if (sl->family->fops && sl->family->fops->add_slave && + ((err = sl->family->fops->add_slave(sl)) < 0)) { + dev_err(&sl->dev, + "sysfs file creation for [%s] failed. err=%d\n", + sl->dev.bus_id, err); + goto out_rem2; } list_add_tail(&sl->w1_slave_entry, &sl->master->slist); return 0; + +out_rem2: + sysfs_remove_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id); +out_rem1: + device_remove_file(&sl->dev, &w1_slave_attr_name); +out_unreg: + device_unregister(&sl->dev); + return err; } static int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn) @@ -413,7 +495,7 @@ static int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn) memcpy(&sl->reg_num, rn, sizeof(sl->reg_num)); atomic_set(&sl->refcnt, 0); - init_completion(&sl->dev_released); + init_completion(&sl->released); spin_lock(&w1_flock); f = w1_family_registered(rn->family); @@ -452,28 +534,23 @@ static void w1_slave_detach(struct w1_slave *sl) { struct w1_netlink_msg msg; - dev_info(&sl->dev, "%s: detaching %s.\n", __func__, sl->name); - - while (atomic_read(&sl->refcnt)) { - printk(KERN_INFO "Waiting for %s to become free: refcnt=%d.\n", - sl->name, atomic_read(&sl->refcnt)); + dev_dbg(&sl->dev, "%s: detaching %s [%p].\n", __func__, sl->name, sl); - if (msleep_interruptible(1000)) - flush_signals(current); - } - - if ( sl->attr_bin.read ) { - sysfs_remove_bin_file (&sl->dev.kobj, &sl->attr_bin); - } - device_remove_file(&sl->dev, &sl->attr_name); - device_unregister(&sl->dev); - w1_family_put(sl->family); + list_del(&sl->w1_slave_entry); - sl->master->slave_count--; + if (sl->family->fops && sl->family->fops->remove_slave) + sl->family->fops->remove_slave(sl); memcpy(&msg.id.id, &sl->reg_num, sizeof(msg.id.id)); msg.type = W1_SLAVE_REMOVE; w1_netlink_send(sl->master, &msg); + + sysfs_remove_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id); + device_remove_file(&sl->dev, &w1_slave_attr_name); + device_unregister(&sl->dev); + + wait_for_completion(&sl->released); + kfree(sl); } static struct w1_master *w1_search_master(unsigned long data) @@ -500,14 +577,13 @@ void w1_reconnect_slaves(struct w1_family *f) spin_lock_bh(&w1_mlock); list_for_each_entry(dev, &w1_masters, w1_master_entry) { - dev_info(&dev->dev, "Reconnecting slaves in %s into new family %02x.\n", + dev_dbg(&dev->dev, "Reconnecting slaves in %s into new family %02x.\n", dev->name, f->fid); set_bit(W1_MASTER_NEED_RECONNECT, &dev->flags); } spin_unlock_bh(&w1_mlock); } - static void w1_slave_found(unsigned long data, u64 rn) { int slave_count; @@ -646,7 +722,7 @@ static int w1_control(void *data) have_to_wait = 0; try_to_freeze(); - msleep_interruptible(w1_timeout * 1000); + msleep_interruptible(w1_control_timeout * 1000); if (signal_pending(current)) flush_signals(current); @@ -679,33 +755,30 @@ static int w1_control(void *data) list_del(&dev->w1_master_entry); spin_unlock_bh(&w1_mlock); + down(&dev->mutex); list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { - list_del(&sl->w1_slave_entry); - w1_slave_detach(sl); - kfree(sl); } w1_destroy_master_attributes(dev); + up(&dev->mutex); atomic_dec(&dev->refcnt); continue; } if (test_bit(W1_MASTER_NEED_RECONNECT, &dev->flags)) { - dev_info(&dev->dev, "Reconnecting slaves in device %s.\n", dev->name); + dev_dbg(&dev->dev, "Reconnecting slaves in device %s.\n", dev->name); down(&dev->mutex); - list_for_each_entry(sl, &dev->slist, w1_slave_entry) { + list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { if (sl->family->fid == W1_FAMILY_DEFAULT) { struct w1_reg_num rn; - list_del(&sl->w1_slave_entry); - w1_slave_detach(sl); memcpy(&rn, &sl->reg_num, sizeof(rn)); - - kfree(sl); + w1_slave_detach(sl); w1_attach_slave_device(dev, &rn); } } + dev_dbg(&dev->dev, "Reconnecting slaves in device %s has been finished.\n", dev->name); clear_bit(W1_MASTER_NEED_RECONNECT, &dev->flags); up(&dev->mutex); } @@ -749,10 +822,7 @@ int w1_process(void *data) list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { if (!test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags) && !--sl->ttl) { - list_del (&sl->w1_slave_entry); - - w1_slave_detach (sl); - kfree (sl); + w1_slave_detach(sl); dev->slave_count--; } else if (test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags)) @@ -783,7 +853,7 @@ static int w1_init(void) goto err_out_exit_init; } - retval = driver_register(&w1_driver); + retval = driver_register(&w1_master_driver); if (retval) { printk(KERN_ERR "Failed to register master driver. err=%d.\n", @@ -791,18 +861,29 @@ static int w1_init(void) goto err_out_bus_unregister; } + retval = driver_register(&w1_slave_driver); + if (retval) { + printk(KERN_ERR + "Failed to register master driver. err=%d.\n", + retval); + goto err_out_master_unregister; + } + control_thread = kernel_thread(&w1_control, NULL, 0); if (control_thread < 0) { printk(KERN_ERR "Failed to create control thread. err=%d\n", control_thread); retval = control_thread; - goto err_out_driver_unregister; + goto err_out_slave_unregister; } return 0; -err_out_driver_unregister: - driver_unregister(&w1_driver); +err_out_slave_unregister: + driver_unregister(&w1_slave_driver); + +err_out_master_unregister: + driver_unregister(&w1_master_driver); err_out_bus_unregister: bus_unregister(&w1_bus_type); @@ -821,7 +902,8 @@ static void w1_fini(void) control_needs_exit = 1; wait_for_completion(&w1_control_complete); - driver_unregister(&w1_driver); + driver_unregister(&w1_slave_driver); + driver_unregister(&w1_master_driver); bus_unregister(&w1_bus_type); } diff --git a/drivers/w1/w1.h b/drivers/w1/w1.h index 4f0a986e33e3..d8900780c3bf 100644 --- a/drivers/w1/w1.h +++ b/drivers/w1/w1.h @@ -75,11 +75,9 @@ struct w1_slave struct w1_master *master; struct w1_family *family; + void *family_data; struct device dev; - struct completion dev_released; - - struct bin_attribute attr_bin; - struct device_attribute attr_name; + struct completion released; }; typedef void (* w1_slave_found_callback)(unsigned long, u64); @@ -179,7 +177,6 @@ struct w1_master struct device_driver *driver; struct device dev; - struct completion dev_released; struct completion dev_exited; struct w1_bus_master *bus_master; @@ -191,6 +188,21 @@ struct w1_master int w1_create_master_attributes(struct w1_master *); void w1_search(struct w1_master *dev, w1_slave_found_callback cb); +static inline struct w1_slave* dev_to_w1_slave(struct device *dev) +{ + return container_of(dev, struct w1_slave, dev); +} + +static inline struct w1_slave* kobj_to_w1_slave(struct kobject *kobj) +{ + return dev_to_w1_slave(container_of(kobj, struct device, kobj)); +} + +static inline struct w1_master* dev_to_w1_master(struct device *dev) +{ + return container_of(dev, struct w1_master, dev); +} + #endif /* __KERNEL__ */ #endif /* __W1_H */ diff --git a/drivers/w1/w1_ds2433.c b/drivers/w1/w1_ds2433.c new file mode 100644 index 000000000000..b7c24b34d270 --- /dev/null +++ b/drivers/w1/w1_ds2433.c @@ -0,0 +1,327 @@ +/* + * w1_ds2433.c - w1 family 23 (DS2433) driver + * + * Copyright (c) 2005 Ben Gardner <bgardner@wabtec.com> + * + * This source code is licensed under the GNU General Public License, + * Version 2. See the file COPYING for more details. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/device.h> +#include <linux/types.h> +#include <linux/delay.h> +#ifdef CONFIG_W1_F23_CRC +#include <linux/crc16.h> +#endif + +#include "w1.h" +#include "w1_io.h" +#include "w1_int.h" +#include "w1_family.h" + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Ben Gardner <bgardner@wabtec.com>"); +MODULE_DESCRIPTION("w1 family 23 driver for DS2433, 4kb EEPROM"); + +#define W1_EEPROM_SIZE 512 +#define W1_PAGE_COUNT 16 +#define W1_PAGE_SIZE 32 +#define W1_PAGE_BITS 5 +#define W1_PAGE_MASK 0x1F + +#define W1_F23_TIME 300 + +#define W1_F23_READ_EEPROM 0xF0 +#define W1_F23_WRITE_SCRATCH 0x0F +#define W1_F23_READ_SCRATCH 0xAA +#define W1_F23_COPY_SCRATCH 0x55 + +struct w1_f23_data { + u8 memory[W1_EEPROM_SIZE]; + u32 validcrc; +}; + +/** + * Check the file size bounds and adjusts count as needed. + * This would not be needed if the file size didn't reset to 0 after a write. + */ +static inline size_t w1_f23_fix_count(loff_t off, size_t count, size_t size) +{ + if (off > size) + return 0; + + if ((off + count) > size) + return (size - off); + + return count; +} + +#ifdef CONFIG_W1_F23_CRC +static int w1_f23_refresh_block(struct w1_slave *sl, struct w1_f23_data *data, + int block) +{ + u8 wrbuf[3]; + int off = block * W1_PAGE_SIZE; + + if (data->validcrc & (1 << block)) + return 0; + + if (w1_reset_select_slave(sl)) { + data->validcrc = 0; + return -EIO; + } + + wrbuf[0] = W1_F23_READ_EEPROM; + wrbuf[1] = off & 0xff; + wrbuf[2] = off >> 8; + w1_write_block(sl->master, wrbuf, 3); + w1_read_block(sl->master, &data->memory[off], W1_PAGE_SIZE); + + /* cache the block if the CRC is valid */ + if (crc16(CRC16_INIT, &data->memory[off], W1_PAGE_SIZE) == CRC16_VALID) + data->validcrc |= (1 << block); + + return 0; +} +#endif /* CONFIG_W1_F23_CRC */ + +static ssize_t w1_f23_read_bin(struct kobject *kobj, char *buf, loff_t off, + size_t count) +{ + struct w1_slave *sl = kobj_to_w1_slave(kobj); +#ifdef CONFIG_W1_F23_CRC + struct w1_f23_data *data = sl->family_data; + int i, min_page, max_page; +#else + u8 wrbuf[3]; +#endif + + if ((count = w1_f23_fix_count(off, count, W1_EEPROM_SIZE)) == 0) + return 0; + + atomic_inc(&sl->refcnt); + if (down_interruptible(&sl->master->mutex)) { + count = 0; + goto out_dec; + } + +#ifdef CONFIG_W1_F23_CRC + + min_page = (off >> W1_PAGE_BITS); + max_page = (off + count - 1) >> W1_PAGE_BITS; + for (i = min_page; i <= max_page; i++) { + if (w1_f23_refresh_block(sl, data, i)) { + count = -EIO; + goto out_up; + } + } + memcpy(buf, &data->memory[off], count); + +#else /* CONFIG_W1_F23_CRC */ + + /* read directly from the EEPROM */ + if (w1_reset_select_slave(sl)) { + count = -EIO; + goto out_up; + } + + wrbuf[0] = W1_F23_READ_EEPROM; + wrbuf[1] = off & 0xff; + wrbuf[2] = off >> 8; + w1_write_block(sl->master, wrbuf, 3); + w1_read_block(sl->master, buf, count); + +#endif /* CONFIG_W1_F23_CRC */ + +out_up: + up(&sl->master->mutex); +out_dec: + atomic_dec(&sl->refcnt); + + return count; +} + +/** + * Writes to the scratchpad and reads it back for verification. + * Then copies the scratchpad to EEPROM. + * The data must be on one page. + * The master must be locked. + * + * @param sl The slave structure + * @param addr Address for the write + * @param len length must be <= (W1_PAGE_SIZE - (addr & W1_PAGE_MASK)) + * @param data The data to write + * @return 0=Success -1=failure + */ +static int w1_f23_write(struct w1_slave *sl, int addr, int len, const u8 *data) +{ + u8 wrbuf[4]; + u8 rdbuf[W1_PAGE_SIZE + 3]; + u8 es = (addr + len - 1) & 0x1f; + + /* Write the data to the scratchpad */ + if (w1_reset_select_slave(sl)) + return -1; + + wrbuf[0] = W1_F23_WRITE_SCRATCH; + wrbuf[1] = addr & 0xff; + wrbuf[2] = addr >> 8; + + w1_write_block(sl->master, wrbuf, 3); + w1_write_block(sl->master, data, len); + + /* Read the scratchpad and verify */ + if (w1_reset_select_slave(sl)) + return -1; + + w1_write_8(sl->master, W1_F23_READ_SCRATCH); + w1_read_block(sl->master, rdbuf, len + 3); + + /* Compare what was read against the data written */ + if ((rdbuf[0] != wrbuf[1]) || (rdbuf[1] != wrbuf[2]) || + (rdbuf[2] != es) || (memcmp(data, &rdbuf[3], len) != 0)) + return -1; + + /* Copy the scratchpad to EEPROM */ + if (w1_reset_select_slave(sl)) + return -1; + + wrbuf[0] = W1_F23_COPY_SCRATCH; + wrbuf[3] = es; + w1_write_block(sl->master, wrbuf, 4); + + /* Sleep for 5 ms to wait for the write to complete */ + msleep(5); + + /* Reset the bus to wake up the EEPROM (this may not be needed) */ + w1_reset_bus(sl->master); + + return 0; +} + +static ssize_t w1_f23_write_bin(struct kobject *kobj, char *buf, loff_t off, + size_t count) +{ + struct w1_slave *sl = kobj_to_w1_slave(kobj); + int addr, len, idx; + + if ((count = w1_f23_fix_count(off, count, W1_EEPROM_SIZE)) == 0) + return 0; + +#ifdef CONFIG_W1_F23_CRC + /* can only write full blocks in cached mode */ + if ((off & W1_PAGE_MASK) || (count & W1_PAGE_MASK)) { + dev_err(&sl->dev, "invalid offset/count off=%d cnt=%d\n", + (int)off, count); + return -EINVAL; + } + + /* make sure the block CRCs are valid */ + for (idx = 0; idx < count; idx += W1_PAGE_SIZE) { + if (crc16(CRC16_INIT, &buf[idx], W1_PAGE_SIZE) != CRC16_VALID) { + dev_err(&sl->dev, "bad CRC at offset %d\n", (int)off); + return -EINVAL; + } + } +#endif /* CONFIG_W1_F23_CRC */ + + atomic_inc(&sl->refcnt); + if (down_interruptible(&sl->master->mutex)) { + count = 0; + goto out_dec; + } + + /* Can only write data to one page at a time */ + idx = 0; + while (idx < count) { + addr = off + idx; + len = W1_PAGE_SIZE - (addr & W1_PAGE_MASK); + if (len > (count - idx)) + len = count - idx; + + if (w1_f23_write(sl, addr, len, &buf[idx]) < 0) { + count = -EIO; + goto out_up; + } + idx += len; + } + +out_up: + up(&sl->master->mutex); +out_dec: + atomic_dec(&sl->refcnt); + + return count; +} + +static struct bin_attribute w1_f23_bin_attr = { + .attr = { + .name = "eeprom", + .mode = S_IRUGO | S_IWUSR, + .owner = THIS_MODULE, + }, + .size = W1_EEPROM_SIZE, + .read = w1_f23_read_bin, + .write = w1_f23_write_bin, +}; + +static int w1_f23_add_slave(struct w1_slave *sl) +{ + int err; +#ifdef CONFIG_W1_F23_CRC + struct w1_f23_data *data; + + data = kmalloc(sizeof(struct w1_f23_data), GFP_KERNEL); + if (!data) + return -ENOMEM; + memset(data, 0, sizeof(struct w1_f23_data)); + sl->family_data = data; + +#endif /* CONFIG_W1_F23_CRC */ + + err = sysfs_create_bin_file(&sl->dev.kobj, &w1_f23_bin_attr); + +#ifdef CONFIG_W1_F23_CRC + if (err) + kfree(data); +#endif /* CONFIG_W1_F23_CRC */ + + return err; +} + +static void w1_f23_remove_slave(struct w1_slave *sl) +{ +#ifdef CONFIG_W1_F23_CRC + if (sl->family_data) { + kfree(sl->family_data); + sl->family_data = NULL; + } +#endif /* CONFIG_W1_F23_CRC */ + sysfs_remove_bin_file(&sl->dev.kobj, &w1_f23_bin_attr); +} + +static struct w1_family_ops w1_f23_fops = { + .add_slave = w1_f23_add_slave, + .remove_slave = w1_f23_remove_slave, +}; + +static struct w1_family w1_family_23 = { + .fid = W1_EEPROM_DS2433, + .fops = &w1_f23_fops, +}; + +static int __init w1_f23_init(void) +{ + return w1_register_family(&w1_family_23); +} + +static void __exit w1_f23_fini(void) +{ + w1_unregister_family(&w1_family_23); +} + +module_init(w1_f23_init); +module_exit(w1_f23_fini); diff --git a/drivers/w1/w1_family.c b/drivers/w1/w1_family.c index 02eee57d3c0c..88c517a4c178 100644 --- a/drivers/w1/w1_family.c +++ b/drivers/w1/w1_family.c @@ -29,23 +29,12 @@ DEFINE_SPINLOCK(w1_flock); static LIST_HEAD(w1_families); extern void w1_reconnect_slaves(struct w1_family *f); -static int w1_check_family(struct w1_family *f) -{ - if (!f->fops->rname || !f->fops->rbin) - return -EINVAL; - - return 0; -} - int w1_register_family(struct w1_family *newf) { struct list_head *ent, *n; struct w1_family *f; int ret = 0; - if (w1_check_family(newf)) - return -EINVAL; - spin_lock(&w1_flock); list_for_each_safe(ent, n, &w1_families) { f = list_entry(ent, struct w1_family, family_entry); diff --git a/drivers/w1/w1_family.h b/drivers/w1/w1_family.h index b26da01bbc38..2ca0489c716a 100644 --- a/drivers/w1/w1_family.h +++ b/drivers/w1/w1_family.h @@ -31,14 +31,17 @@ #define W1_FAMILY_SMEM_81 0x81 #define W1_THERM_DS18S20 0x10 #define W1_THERM_DS1822 0x22 +#define W1_EEPROM_DS2433 0x23 #define W1_THERM_DS18B20 0x28 #define MAXNAMELEN 32 +struct w1_slave; + struct w1_family_ops { - ssize_t (* rname)(struct device *, struct device_attribute *, char *); - ssize_t (* rbin)(struct kobject *, char *, loff_t, size_t); + int (* add_slave)(struct w1_slave *); + void (* remove_slave)(struct w1_slave *); }; struct w1_family diff --git a/drivers/w1/w1_int.c b/drivers/w1/w1_int.c index 498ad505fa5f..c3f67eafc7ec 100644 --- a/drivers/w1/w1_int.c +++ b/drivers/w1/w1_int.c @@ -29,9 +29,9 @@ static u32 w1_ids = 1; -extern struct device_driver w1_driver; +extern struct device_driver w1_master_driver; extern struct bus_type w1_bus_type; -extern struct device w1_device; +extern struct device w1_master_device; extern int w1_max_slave_count; extern int w1_max_slave_ttl; extern struct list_head w1_masters; @@ -76,7 +76,6 @@ static struct w1_master * w1_alloc_dev(u32 id, int slave_count, int slave_ttl, INIT_LIST_HEAD(&dev->slist); init_MUTEX(&dev->mutex); - init_completion(&dev->dev_released); init_completion(&dev->dev_exited); memcpy(&dev->dev, device, sizeof(struct device)); @@ -88,17 +87,14 @@ static struct w1_master * w1_alloc_dev(u32 id, int slave_count, int slave_ttl, dev->groups = 1; dev->seq = 1; - dev->nls = netlink_kernel_create(NETLINK_W1, 1, NULL, THIS_MODULE); - if (!dev->nls) { - printk(KERN_ERR "Failed to create new netlink socket(%u) for w1 master %s.\n", - NETLINK_NFLOG, dev->dev.bus_id); - } + dev_init_netlink(dev); err = device_register(&dev->dev); if (err) { printk(KERN_ERR "Failed to register master device. err=%d\n", err); - if (dev->nls && dev->nls->sk_socket) - sock_release(dev->nls->sk_socket); + + dev_fini_netlink(dev); + memset(dev, 0, sizeof(struct w1_master)); kfree(dev); dev = NULL; @@ -107,13 +103,9 @@ static struct w1_master * w1_alloc_dev(u32 id, int slave_count, int slave_ttl, return dev; } -static void w1_free_dev(struct w1_master *dev) +void w1_free_dev(struct w1_master *dev) { device_unregister(&dev->dev); - if (dev->nls && dev->nls->sk_socket) - sock_release(dev->nls->sk_socket); - memset(dev, 0, sizeof(struct w1_master) + sizeof(struct w1_bus_master)); - kfree(dev); } int w1_add_master_device(struct w1_bus_master *master) @@ -129,7 +121,7 @@ int w1_add_master_device(struct w1_bus_master *master) return(-EINVAL); } - dev = w1_alloc_dev(w1_ids++, w1_max_slave_count, w1_max_slave_ttl, &w1_driver, &w1_device); + dev = w1_alloc_dev(w1_ids++, w1_max_slave_count, w1_max_slave_ttl, &w1_master_driver, &w1_master_device); if (!dev) return -ENOMEM; @@ -188,7 +180,7 @@ void __w1_remove_master_device(struct w1_master *dev) __func__, dev->kpid); while (atomic_read(&dev->refcnt)) { - printk(KERN_INFO "Waiting for %s to become free: refcnt=%d.\n", + dev_dbg(&dev->dev, "Waiting for %s to become free: refcnt=%d.\n", dev->name, atomic_read(&dev->refcnt)); if (msleep_interruptible(1000)) diff --git a/drivers/w1/w1_io.c b/drivers/w1/w1_io.c index 00f032220173..e2a043354ddf 100644 --- a/drivers/w1/w1_io.c +++ b/drivers/w1/w1_io.c @@ -277,6 +277,29 @@ void w1_search_devices(struct w1_master *dev, w1_slave_found_callback cb) w1_search(dev, cb); } +/** + * Resets the bus and then selects the slave by sending either a skip rom + * or a rom match. + * The w1 master lock must be held. + * + * @param sl the slave to select + * @return 0=success, anything else=error + */ +int w1_reset_select_slave(struct w1_slave *sl) +{ + if (w1_reset_bus(sl->master)) + return -1; + + if (sl->master->slave_count == 1) + w1_write_8(sl->master, W1_SKIP_ROM); + else { + u8 match[9] = {W1_MATCH_ROM, }; + memcpy(&match[1], (u8 *)&sl->reg_num, 8); + w1_write_block(sl->master, match, 9); + } + return 0; +} + EXPORT_SYMBOL(w1_touch_bit); EXPORT_SYMBOL(w1_write_8); EXPORT_SYMBOL(w1_read_8); @@ -286,3 +309,4 @@ EXPORT_SYMBOL(w1_delay); EXPORT_SYMBOL(w1_read_block); EXPORT_SYMBOL(w1_write_block); EXPORT_SYMBOL(w1_search_devices); +EXPORT_SYMBOL(w1_reset_select_slave); diff --git a/drivers/w1/w1_io.h b/drivers/w1/w1_io.h index af5829778aaa..232860184a29 100644 --- a/drivers/w1/w1_io.h +++ b/drivers/w1/w1_io.h @@ -34,5 +34,6 @@ u8 w1_calc_crc8(u8 *, int); void w1_write_block(struct w1_master *, const u8 *, int); u8 w1_read_block(struct w1_master *, u8 *, int); void w1_search_devices(struct w1_master *dev, w1_slave_found_callback cb); +int w1_reset_select_slave(struct w1_slave *sl); #endif /* __W1_IO_H */ diff --git a/drivers/w1/w1_netlink.c b/drivers/w1/w1_netlink.c index e7b774423dd6..328645da7972 100644 --- a/drivers/w1/w1_netlink.c +++ b/drivers/w1/w1_netlink.c @@ -57,10 +57,36 @@ void w1_netlink_send(struct w1_master *dev, struct w1_netlink_msg *msg) nlmsg_failure: return; } + +int dev_init_netlink(struct w1_master *dev) +{ + dev->nls = netlink_kernel_create(NETLINK_W1, 1, NULL, THIS_MODULE); + if (!dev->nls) { + printk(KERN_ERR "Failed to create new netlink socket(%u) for w1 master %s.\n", + NETLINK_W1, dev->dev.bus_id); + } + + return 0; +} + +void dev_fini_netlink(struct w1_master *dev) +{ + if (dev->nls && dev->nls->sk_socket) + sock_release(dev->nls->sk_socket); +} #else #warning Netlink support is disabled. Please compile with NET support enabled. void w1_netlink_send(struct w1_master *dev, struct w1_netlink_msg *msg) { } + +int dev_init_netlink(struct w1_master *dev) +{ + return 0; +} + +void dev_fini_netlink(struct w1_master *dev) +{ +} #endif diff --git a/drivers/w1/w1_netlink.h b/drivers/w1/w1_netlink.h index 8615756946df..eb0c8b3152c8 100644 --- a/drivers/w1/w1_netlink.h +++ b/drivers/w1/w1_netlink.h @@ -52,6 +52,8 @@ struct w1_netlink_msg #ifdef __KERNEL__ void w1_netlink_send(struct w1_master *, struct w1_netlink_msg *); +int dev_init_netlink(struct w1_master *dev); +void dev_fini_netlink(struct w1_master *dev); #endif /* __KERNEL__ */ #endif /* __W1_NETLINK_H */ diff --git a/drivers/w1/w1_smem.c b/drivers/w1/w1_smem.c index 70d2d469963c..e3209d0aca9b 100644 --- a/drivers/w1/w1_smem.c +++ b/drivers/w1/w1_smem.c @@ -36,61 +36,12 @@ MODULE_LICENSE("GPL"); MODULE_AUTHOR("Evgeniy Polyakov <johnpol@2ka.mipt.ru>"); MODULE_DESCRIPTION("Driver for 1-wire Dallas network protocol, 64bit memory family."); -static ssize_t w1_smem_read_name(struct device *, struct device_attribute *attr, char *); -static ssize_t w1_smem_read_bin(struct kobject *, char *, loff_t, size_t); - -static struct w1_family_ops w1_smem_fops = { - .rname = &w1_smem_read_name, - .rbin = &w1_smem_read_bin, -}; - -static ssize_t w1_smem_read_name(struct device *dev, struct device_attribute *attr, char *buf) -{ - struct w1_slave *sl = container_of(dev, struct w1_slave, dev); - - return sprintf(buf, "%s\n", sl->name); -} - -static ssize_t w1_smem_read_bin(struct kobject *kobj, char *buf, loff_t off, size_t count) -{ - struct w1_slave *sl = container_of(container_of(kobj, struct device, kobj), - struct w1_slave, dev); - int i; - - atomic_inc(&sl->refcnt); - if (down_interruptible(&sl->master->mutex)) { - count = 0; - goto out_dec; - } - - if (off > W1_SLAVE_DATA_SIZE) { - count = 0; - goto out; - } - if (off + count > W1_SLAVE_DATA_SIZE) { - count = 0; - goto out; - } - for (i = 0; i < 8; ++i) - count += sprintf(buf + count, "%02x ", ((u8 *)&sl->reg_num)[i]); - count += sprintf(buf + count, "\n"); - -out: - up(&sl->master->mutex); -out_dec: - atomic_dec(&sl->refcnt); - - return count; -} - static struct w1_family w1_smem_family_01 = { .fid = W1_FAMILY_SMEM_01, - .fops = &w1_smem_fops, }; static struct w1_family w1_smem_family_81 = { .fid = W1_FAMILY_SMEM_81, - .fops = &w1_smem_fops, }; static int __init w1_smem_init(void) diff --git a/drivers/w1/w1_therm.c b/drivers/w1/w1_therm.c index 165526c9360a..4577df3cfc48 100644 --- a/drivers/w1/w1_therm.c +++ b/drivers/w1/w1_therm.c @@ -42,12 +42,31 @@ static u8 bad_roms[][9] = { {} }; -static ssize_t w1_therm_read_name(struct device *, struct device_attribute *attr, char *); static ssize_t w1_therm_read_bin(struct kobject *, char *, loff_t, size_t); +static struct bin_attribute w1_therm_bin_attr = { + .attr = { + .name = "w1_slave", + .mode = S_IRUGO, + .owner = THIS_MODULE, + }, + .size = W1_SLAVE_DATA_SIZE, + .read = w1_therm_read_bin, +}; + +static int w1_therm_add_slave(struct w1_slave *sl) +{ + return sysfs_create_bin_file(&sl->dev.kobj, &w1_therm_bin_attr); +} + +static void w1_therm_remove_slave(struct w1_slave *sl) +{ + sysfs_remove_bin_file(&sl->dev.kobj, &w1_therm_bin_attr); +} + static struct w1_family_ops w1_therm_fops = { - .rname = &w1_therm_read_name, - .rbin = &w1_therm_read_bin, + .add_slave = w1_therm_add_slave, + .remove_slave = w1_therm_remove_slave, }; static struct w1_family w1_therm_family_DS18S20 = { @@ -59,6 +78,7 @@ static struct w1_family w1_therm_family_DS18B20 = { .fid = W1_THERM_DS18B20, .fops = &w1_therm_fops, }; + static struct w1_family w1_therm_family_DS1822 = { .fid = W1_THERM_DS1822, .fops = &w1_therm_fops, @@ -90,13 +110,6 @@ static struct w1_therm_family_converter w1_therm_families[] = { }, }; -static ssize_t w1_therm_read_name(struct device *dev, struct device_attribute *attr, char *buf) -{ - struct w1_slave *sl = container_of(dev, struct w1_slave, dev); - - return sprintf(buf, "%s\n", sl->name); -} - static inline int w1_DS18B20_convert_temp(u8 rom[9]) { int t = (rom[1] << 8) | rom[0]; @@ -148,8 +161,7 @@ static int w1_therm_check_rom(u8 rom[9]) static ssize_t w1_therm_read_bin(struct kobject *kobj, char *buf, loff_t off, size_t count) { - struct w1_slave *sl = container_of(container_of(kobj, struct device, kobj), - struct w1_slave, dev); + struct w1_slave *sl = kobj_to_w1_slave(kobj); struct w1_master *dev = sl->master; u8 rom[9], crc, verdict; int i, max_trying = 10; @@ -178,15 +190,10 @@ static ssize_t w1_therm_read_bin(struct kobject *kobj, char *buf, loff_t off, si crc = 0; while (max_trying--) { - if (!w1_reset_bus (dev)) { + if (!w1_reset_select_slave(sl)) { int count = 0; - u8 match[9] = {W1_MATCH_ROM, }; unsigned int tm = 750; - memcpy(&match[1], (u64 *) & sl->reg_num, 8); - - w1_write_block(dev, match, 9); - w1_write_8(dev, W1_CONVERT_TEMP); while (tm) { @@ -195,8 +202,7 @@ static ssize_t w1_therm_read_bin(struct kobject *kobj, char *buf, loff_t off, si flush_signals(current); } - if (!w1_reset_bus (dev)) { - w1_write_block(dev, match, 9); + if (!w1_reset_select_slave(sl)) { w1_write_8(dev, W1_READ_SCRATCHPAD); if ((count = w1_read_block(dev, rom, 9)) != 9) { @@ -207,7 +213,6 @@ static ssize_t w1_therm_read_bin(struct kobject *kobj, char *buf, loff_t off, si if (rom[8] == crc && rom[0]) verdict = 1; - } } diff --git a/include/linux/crc16.h b/include/linux/crc16.h new file mode 100644 index 000000000000..bdedf825b04a --- /dev/null +++ b/include/linux/crc16.h @@ -0,0 +1,44 @@ +/* + * crc16.h - CRC-16 routine + * + * Implements the standard CRC-16, as used with 1-wire devices: + * Width 16 + * Poly 0x8005 (x^16 + x^15 + x^2 + 1) + * Init 0 + * + * For 1-wire devices, the CRC is stored inverted, LSB-first + * + * Example buffer with the CRC attached: + * 31 32 33 34 35 36 37 38 39 C2 44 + * + * The CRC over a buffer with the CRC attached is 0xB001. + * So, if (crc16(0, buf, size) == 0xB001) then the buffer is valid. + * + * Refer to "Application Note 937: Book of iButton Standards" for details. + * http://www.maxim-ic.com/appnotes.cfm/appnote_number/937 + * + * Copyright (c) 2005 Ben Gardner <bgardner@wabtec.com> + * + * This source code is licensed under the GNU General Public License, + * Version 2. See the file COPYING for more details. + */ + +#ifndef __CRC16_H +#define __CRC16_H + +#include <linux/types.h> + +#define CRC16_INIT 0 +#define CRC16_VALID 0xb001 + +extern u16 const crc16_table[256]; + +extern u16 crc16(u16 crc, const u8 *buffer, size_t len); + +static inline u16 crc16_byte(u16 crc, const u8 data) +{ + return (crc >> 8) ^ crc16_table[(crc ^ data) & 0xff]; +} + +#endif /* __CRC16_H */ + diff --git a/lib/Kconfig b/lib/Kconfig index e43197efeb9c..3de93357f5ab 100644 --- a/lib/Kconfig +++ b/lib/Kconfig @@ -12,6 +12,14 @@ config CRC_CCITT the kernel tree does. Such modules that use library CRC-CCITT functions require M here. +config CRC16 + tristate "CRC16 functions" + help + This option is provided for the case where no in-kernel-tree + modules require CRC16 functions, but a module built outside + the kernel tree does. Such modules that use library CRC16 + functions require M here. + config CRC32 tristate "CRC32 functions" default y diff --git a/lib/Makefile b/lib/Makefile index 3e2bd0df23bb..d9c38ba05e7b 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -23,11 +23,12 @@ lib-$(CONFIG_GENERIC_FIND_NEXT_BIT) += find_next_bit.o obj-$(CONFIG_LOCK_KERNEL) += kernel_lock.o obj-$(CONFIG_DEBUG_PREEMPT) += smp_processor_id.o -ifneq ($(CONFIG_HAVE_DEC_LOCK),y) +ifneq ($(CONFIG_HAVE_DEC_LOCK),y) lib-y += dec_and_lock.o endif obj-$(CONFIG_CRC_CCITT) += crc-ccitt.o +obj-$(CONFIG_CRC16) += crc16.o obj-$(CONFIG_CRC32) += crc32.o obj-$(CONFIG_LIBCRC32C) += libcrc32c.o obj-$(CONFIG_GENERIC_IOMAP) += iomap.o diff --git a/lib/crc16.c b/lib/crc16.c new file mode 100644 index 000000000000..011fe573c666 --- /dev/null +++ b/lib/crc16.c @@ -0,0 +1,67 @@ +/* + * crc16.c + * + * This source code is licensed under the GNU General Public License, + * Version 2. See the file COPYING for more details. + */ + +#include <linux/types.h> +#include <linux/module.h> +#include <linux/crc16.h> + +/** CRC table for the CRC-16. The poly is 0x8005 (x^16 + x^15 + x^2 + 1) */ +u16 const crc16_table[256] = { + 0x0000, 0xC0C1, 0xC181, 0x0140, 0xC301, 0x03C0, 0x0280, 0xC241, + 0xC601, 0x06C0, 0x0780, 0xC741, 0x0500, 0xC5C1, 0xC481, 0x0440, + 0xCC01, 0x0CC0, 0x0D80, 0xCD41, 0x0F00, 0xCFC1, 0xCE81, 0x0E40, + 0x0A00, 0xCAC1, 0xCB81, 0x0B40, 0xC901, 0x09C0, 0x0880, 0xC841, + 0xD801, 0x18C0, 0x1980, 0xD941, 0x1B00, 0xDBC1, 0xDA81, 0x1A40, + 0x1E00, 0xDEC1, 0xDF81, 0x1F40, 0xDD01, 0x1DC0, 0x1C80, 0xDC41, + 0x1400, 0xD4C1, 0xD581, 0x1540, 0xD701, 0x17C0, 0x1680, 0xD641, + 0xD201, 0x12C0, 0x1380, 0xD341, 0x1100, 0xD1C1, 0xD081, 0x1040, + 0xF001, 0x30C0, 0x3180, 0xF141, 0x3300, 0xF3C1, 0xF281, 0x3240, + 0x3600, 0xF6C1, 0xF781, 0x3740, 0xF501, 0x35C0, 0x3480, 0xF441, + 0x3C00, 0xFCC1, 0xFD81, 0x3D40, 0xFF01, 0x3FC0, 0x3E80, 0xFE41, + 0xFA01, 0x3AC0, 0x3B80, 0xFB41, 0x3900, 0xF9C1, 0xF881, 0x3840, + 0x2800, 0xE8C1, 0xE981, 0x2940, 0xEB01, 0x2BC0, 0x2A80, 0xEA41, + 0xEE01, 0x2EC0, 0x2F80, 0xEF41, 0x2D00, 0xEDC1, 0xEC81, 0x2C40, + 0xE401, 0x24C0, 0x2580, 0xE541, 0x2700, 0xE7C1, 0xE681, 0x2640, + 0x2200, 0xE2C1, 0xE381, 0x2340, 0xE101, 0x21C0, 0x2080, 0xE041, + 0xA001, 0x60C0, 0x6180, 0xA141, 0x6300, 0xA3C1, 0xA281, 0x6240, + 0x6600, 0xA6C1, 0xA781, 0x6740, 0xA501, 0x65C0, 0x6480, 0xA441, + 0x6C00, 0xACC1, 0xAD81, 0x6D40, 0xAF01, 0x6FC0, 0x6E80, 0xAE41, + 0xAA01, 0x6AC0, 0x6B80, 0xAB41, 0x6900, 0xA9C1, 0xA881, 0x6840, + 0x7800, 0xB8C1, 0xB981, 0x7940, 0xBB01, 0x7BC0, 0x7A80, 0xBA41, + 0xBE01, 0x7EC0, 0x7F80, 0xBF41, 0x7D00, 0xBDC1, 0xBC81, 0x7C40, + 0xB401, 0x74C0, 0x7580, 0xB541, 0x7700, 0xB7C1, 0xB681, 0x7640, + 0x7200, 0xB2C1, 0xB381, 0x7340, 0xB101, 0x71C0, 0x7080, 0xB041, + 0x5000, 0x90C1, 0x9181, 0x5140, 0x9301, 0x53C0, 0x5280, 0x9241, + 0x9601, 0x56C0, 0x5780, 0x9741, 0x5500, 0x95C1, 0x9481, 0x5440, + 0x9C01, 0x5CC0, 0x5D80, 0x9D41, 0x5F00, 0x9FC1, 0x9E81, 0x5E40, + 0x5A00, 0x9AC1, 0x9B81, 0x5B40, 0x9901, 0x59C0, 0x5880, 0x9841, + 0x8801, 0x48C0, 0x4980, 0x8941, 0x4B00, 0x8BC1, 0x8A81, 0x4A40, + 0x4E00, 0x8EC1, 0x8F81, 0x4F40, 0x8D01, 0x4DC0, 0x4C80, 0x8C41, + 0x4400, 0x84C1, 0x8581, 0x4540, 0x8701, 0x47C0, 0x4680, 0x8641, + 0x8201, 0x42C0, 0x4380, 0x8341, 0x4100, 0x81C1, 0x8081, 0x4040 +}; +EXPORT_SYMBOL(crc16_table); + +/** + * Compute the CRC-16 for the data buffer + * + * @param crc previous CRC value + * @param buffer data pointer + * @param len number of bytes in the buffer + * @return the updated CRC value + */ +u16 crc16(u16 crc, u8 const *buffer, size_t len) +{ + while (len--) + crc = crc16_byte(crc, *buffer++); + return crc; +} +EXPORT_SYMBOL(crc16); + +MODULE_DESCRIPTION("CRC16 calculations"); +MODULE_LICENSE("GPL"); + |