2019-05-29 16:57:58 -07:00
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// SPDX-License-Identifier: GPL-2.0-only
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2019-08-27 13:46:41 +02:00
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/* Copyright (C) 2005 Marc Kleine-Budde, Pengutronix
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2009-05-15 23:39:29 +00:00
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* Copyright (C) 2006 Andrey Volkov, Varma Electronics
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* Copyright (C) 2008-2009 Wolfgang Grandegger <wg@grandegger.com>
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*/
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#include <linux/kernel.h>
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include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files. percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.
percpu.h -> slab.h dependency is about to be removed. Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability. As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.
http://userweb.kernel.org/~tj/misc/slabh-sweep.py
The script does the followings.
* Scan files for gfp and slab usages and update includes such that
only the necessary includes are there. ie. if only gfp is used,
gfp.h, if slab is used, slab.h.
* When the script inserts a new include, it looks at the include
blocks and try to put the new include such that its order conforms
to its surrounding. It's put in the include block which contains
core kernel includes, in the same order that the rest are ordered -
alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
doesn't seem to be any matching order.
* If the script can't find a place to put a new include (mostly
because the file doesn't have fitting include block), it prints out
an error message indicating which .h file needs to be added to the
file.
The conversion was done in the following steps.
1. The initial automatic conversion of all .c files updated slightly
over 4000 files, deleting around 700 includes and adding ~480 gfp.h
and ~3000 slab.h inclusions. The script emitted errors for ~400
files.
2. Each error was manually checked. Some didn't need the inclusion,
some needed manual addition while adding it to implementation .h or
embedding .c file was more appropriate for others. This step added
inclusions to around 150 files.
3. The script was run again and the output was compared to the edits
from #2 to make sure no file was left behind.
4. Several build tests were done and a couple of problems were fixed.
e.g. lib/decompress_*.c used malloc/free() wrappers around slab
APIs requiring slab.h to be added manually.
5. The script was run on all .h files but without automatically
editing them as sprinkling gfp.h and slab.h inclusions around .h
files could easily lead to inclusion dependency hell. Most gfp.h
inclusion directives were ignored as stuff from gfp.h was usually
wildly available and often used in preprocessor macros. Each
slab.h inclusion directive was examined and added manually as
necessary.
6. percpu.h was updated not to include slab.h.
7. Build test were done on the following configurations and failures
were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
distributed build env didn't work with gcov compiles) and a few
more options had to be turned off depending on archs to make things
build (like ipr on powerpc/64 which failed due to missing writeq).
* x86 and x86_64 UP and SMP allmodconfig and a custom test config.
* powerpc and powerpc64 SMP allmodconfig
* sparc and sparc64 SMP allmodconfig
* ia64 SMP allmodconfig
* s390 SMP allmodconfig
* alpha SMP allmodconfig
* um on x86_64 SMP allmodconfig
8. percpu.h modifications were reverted so that it could be applied as
a separate patch and serve as bisection point.
Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.
Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 17:04:11 +09:00
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#include <linux/slab.h>
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2009-05-15 23:39:29 +00:00
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#include <linux/netdevice.h>
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#include <linux/if_arp.h>
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2016-09-07 16:51:12 +03:00
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#include <linux/workqueue.h>
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2009-05-15 23:39:29 +00:00
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#include <linux/can.h>
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2018-10-08 09:02:38 +02:00
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#include <linux/can/can-ml.h>
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2009-05-15 23:39:29 +00:00
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#include <linux/can/dev.h>
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2013-01-17 18:43:39 +01:00
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#include <linux/can/skb.h>
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2021-08-18 09:12:32 +02:00
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#include <linux/gpio/consumer.h>
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2018-01-10 16:25:18 +05:30
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#include <linux/of.h>
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2009-05-15 23:39:29 +00:00
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2014-12-03 17:54:13 +00:00
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static void can_update_state_error_stats(struct net_device *dev,
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enum can_state new_state)
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{
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struct can_priv *priv = netdev_priv(dev);
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if (new_state <= priv->state)
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return;
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switch (new_state) {
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case CAN_STATE_ERROR_WARNING:
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priv->can_stats.error_warning++;
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break;
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case CAN_STATE_ERROR_PASSIVE:
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priv->can_stats.error_passive++;
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break;
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case CAN_STATE_BUS_OFF:
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2015-01-16 14:30:28 +00:00
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priv->can_stats.bus_off++;
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break;
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2014-12-03 17:54:13 +00:00
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default:
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break;
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2015-01-16 16:52:21 +08:00
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}
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2014-12-03 17:54:13 +00:00
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}
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static int can_tx_state_to_frame(struct net_device *dev, enum can_state state)
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{
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switch (state) {
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case CAN_STATE_ERROR_ACTIVE:
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return CAN_ERR_CRTL_ACTIVE;
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case CAN_STATE_ERROR_WARNING:
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return CAN_ERR_CRTL_TX_WARNING;
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case CAN_STATE_ERROR_PASSIVE:
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return CAN_ERR_CRTL_TX_PASSIVE;
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default:
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return 0;
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}
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}
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static int can_rx_state_to_frame(struct net_device *dev, enum can_state state)
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{
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switch (state) {
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case CAN_STATE_ERROR_ACTIVE:
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return CAN_ERR_CRTL_ACTIVE;
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case CAN_STATE_ERROR_WARNING:
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return CAN_ERR_CRTL_RX_WARNING;
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case CAN_STATE_ERROR_PASSIVE:
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return CAN_ERR_CRTL_RX_PASSIVE;
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default:
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return 0;
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}
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}
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2021-01-20 02:03:55 +09:00
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const char *can_get_state_str(const enum can_state state)
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2020-09-16 00:35:02 +02:00
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{
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switch (state) {
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case CAN_STATE_ERROR_ACTIVE:
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return "Error Active";
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case CAN_STATE_ERROR_WARNING:
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return "Error Warning";
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case CAN_STATE_ERROR_PASSIVE:
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return "Error Passive";
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case CAN_STATE_BUS_OFF:
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return "Bus Off";
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case CAN_STATE_STOPPED:
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return "Stopped";
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case CAN_STATE_SLEEPING:
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return "Sleeping";
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default:
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return "<unknown>";
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}
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return "<unknown>";
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}
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2021-01-20 02:03:55 +09:00
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EXPORT_SYMBOL_GPL(can_get_state_str);
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2020-09-16 00:35:02 +02:00
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2014-12-03 17:54:13 +00:00
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void can_change_state(struct net_device *dev, struct can_frame *cf,
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enum can_state tx_state, enum can_state rx_state)
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{
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struct can_priv *priv = netdev_priv(dev);
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enum can_state new_state = max(tx_state, rx_state);
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if (unlikely(new_state == priv->state)) {
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netdev_warn(dev, "%s: oops, state did not change", __func__);
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return;
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}
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2020-09-16 00:35:02 +02:00
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netdev_dbg(dev, "Controller changed from %s State (%d) into %s State (%d).\n",
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can_get_state_str(priv->state), priv->state,
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can_get_state_str(new_state), new_state);
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2014-12-03 17:54:13 +00:00
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can_update_state_error_stats(dev, new_state);
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priv->state = new_state;
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2017-05-18 10:22:22 +02:00
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if (!cf)
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return;
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2014-12-03 17:54:13 +00:00
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if (unlikely(new_state == CAN_STATE_BUS_OFF)) {
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cf->can_id |= CAN_ERR_BUSOFF;
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return;
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}
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cf->can_id |= CAN_ERR_CRTL;
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cf->data[1] |= tx_state >= rx_state ?
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can_tx_state_to_frame(dev, tx_state) : 0;
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cf->data[1] |= tx_state <= rx_state ?
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can_rx_state_to_frame(dev, rx_state) : 0;
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}
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EXPORT_SYMBOL_GPL(can_change_state);
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2019-08-27 13:46:41 +02:00
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/* CAN device restart for bus-off recovery */
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2016-09-07 16:51:12 +03:00
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static void can_restart(struct net_device *dev)
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2009-05-15 23:39:29 +00:00
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{
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struct can_priv *priv = netdev_priv(dev);
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struct sk_buff *skb;
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struct can_frame *cf;
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int err;
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BUG_ON(netif_carrier_ok(dev));
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2019-08-27 13:46:41 +02:00
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/* No synchronization needed because the device is bus-off and
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2009-05-15 23:39:29 +00:00
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* no messages can come in or go out.
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*/
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can_flush_echo_skb(dev);
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/* send restart message upstream */
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2009-10-20 00:08:01 -07:00
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skb = alloc_can_err_skb(dev, &cf);
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2017-10-20 22:36:52 -05:00
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if (!skb)
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2009-07-20 04:06:40 +00:00
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goto restart;
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2017-10-20 22:36:52 -05:00
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2009-10-20 00:08:01 -07:00
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cf->can_id |= CAN_ERR_RESTARTED;
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2009-05-15 23:39:29 +00:00
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2022-03-05 23:12:46 +01:00
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netif_rx(skb);
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2021-01-20 12:16:11 -08:00
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2009-07-20 04:06:40 +00:00
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restart:
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2012-02-01 11:02:05 +01:00
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netdev_dbg(dev, "restarted\n");
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2009-05-15 23:39:29 +00:00
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priv->can_stats.restarts++;
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/* Now restart the device */
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err = priv->do_set_mode(dev, CAN_MODE_START);
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netif_carrier_on(dev);
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if (err)
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2012-02-01 11:02:05 +01:00
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netdev_err(dev, "Error %d during restart", err);
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2009-05-15 23:39:29 +00:00
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}
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2016-09-07 16:51:12 +03:00
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static void can_restart_work(struct work_struct *work)
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{
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struct delayed_work *dwork = to_delayed_work(work);
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2019-08-27 13:53:18 +02:00
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struct can_priv *priv = container_of(dwork, struct can_priv,
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restart_work);
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2016-09-07 16:51:12 +03:00
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can_restart(priv->dev);
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}
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2009-05-15 23:39:29 +00:00
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int can_restart_now(struct net_device *dev)
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{
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struct can_priv *priv = netdev_priv(dev);
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2019-08-27 13:46:41 +02:00
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/* A manual restart is only permitted if automatic restart is
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2009-05-15 23:39:29 +00:00
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* disabled and the device is in the bus-off state
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*/
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if (priv->restart_ms)
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return -EINVAL;
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if (priv->state != CAN_STATE_BUS_OFF)
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return -EBUSY;
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2016-09-07 16:51:12 +03:00
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cancel_delayed_work_sync(&priv->restart_work);
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can_restart(dev);
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2009-05-15 23:39:29 +00:00
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return 0;
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}
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2019-08-27 13:46:41 +02:00
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/* CAN bus-off
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2009-05-15 23:39:29 +00:00
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*
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* This functions should be called when the device goes bus-off to
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* tell the netif layer that no more packets can be sent or received.
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* If enabled, a timer is started to trigger bus-off recovery.
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*/
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void can_bus_off(struct net_device *dev)
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{
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struct can_priv *priv = netdev_priv(dev);
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2020-09-16 00:35:03 +02:00
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if (priv->restart_ms)
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netdev_info(dev, "bus-off, scheduling restart in %d ms\n",
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priv->restart_ms);
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else
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netdev_info(dev, "bus-off\n");
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2009-05-15 23:39:29 +00:00
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netif_carrier_off(dev);
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if (priv->restart_ms)
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2016-09-07 16:51:12 +03:00
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schedule_delayed_work(&priv->restart_work,
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msecs_to_jiffies(priv->restart_ms));
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2009-05-15 23:39:29 +00:00
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}
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EXPORT_SYMBOL_GPL(can_bus_off);
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2021-01-11 15:19:21 +01:00
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void can_setup(struct net_device *dev)
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2009-05-15 23:39:29 +00:00
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{
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dev->type = ARPHRD_CAN;
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2012-06-13 20:48:21 +02:00
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dev->mtu = CAN_MTU;
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2009-05-15 23:39:29 +00:00
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dev->hard_header_len = 0;
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dev->addr_len = 0;
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dev->tx_queue_len = 10;
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/* New-style flags. */
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dev->flags = IFF_NOARP;
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2011-11-15 15:29:55 +00:00
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dev->features = NETIF_F_HW_CSUM;
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2009-05-15 23:39:29 +00:00
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}
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|
2019-08-27 13:46:41 +02:00
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/* Allocate and setup space for the CAN network device */
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2018-06-13 16:37:17 +02:00
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struct net_device *alloc_candev_mqs(int sizeof_priv, unsigned int echo_skb_max,
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unsigned int txqs, unsigned int rxqs)
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2009-05-15 23:39:29 +00:00
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{
|
2021-02-23 08:01:26 +01:00
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struct can_ml_priv *can_ml;
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2009-05-15 23:39:29 +00:00
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struct net_device *dev;
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struct can_priv *priv;
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2009-10-08 22:17:11 +00:00
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int size;
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2009-05-15 23:39:29 +00:00
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2018-10-08 09:02:38 +02:00
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/* We put the driver's priv, the CAN mid layer priv and the
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* echo skb into the netdevice's priv. The memory layout for
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* the netdev_priv is like this:
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*
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* +-------------------------+
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* | driver's priv |
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* +-------------------------+
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* | struct can_ml_priv |
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* +-------------------------+
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* | array of struct sk_buff |
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* +-------------------------+
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*/
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size = ALIGN(sizeof_priv, NETDEV_ALIGN) + sizeof(struct can_ml_priv);
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|
2009-10-08 22:17:11 +00:00
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if (echo_skb_max)
|
2018-10-08 09:02:38 +02:00
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size = ALIGN(size, sizeof(struct sk_buff *)) +
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2009-10-08 22:17:11 +00:00
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echo_skb_max * sizeof(struct sk_buff *);
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2018-06-13 16:37:17 +02:00
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dev = alloc_netdev_mqs(size, "can%d", NET_NAME_UNKNOWN, can_setup,
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txqs, rxqs);
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2009-05-15 23:39:29 +00:00
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if (!dev)
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return NULL;
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priv = netdev_priv(dev);
|
2016-09-07 16:51:12 +03:00
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priv->dev = dev;
|
2009-05-15 23:39:29 +00:00
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2021-02-23 08:01:26 +01:00
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can_ml = (void *)priv + ALIGN(sizeof_priv, NETDEV_ALIGN);
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can_set_ml_priv(dev, can_ml);
|
2018-10-08 09:02:39 +02:00
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2009-10-08 22:17:11 +00:00
|
|
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if (echo_skb_max) {
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priv->echo_skb_max = echo_skb_max;
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priv->echo_skb = (void *)priv +
|
2018-10-08 09:02:38 +02:00
|
|
|
(size - echo_skb_max * sizeof(struct sk_buff *));
|
2009-10-08 22:17:11 +00:00
|
|
|
}
|
|
|
|
|
2009-05-15 23:39:29 +00:00
|
|
|
priv->state = CAN_STATE_STOPPED;
|
|
|
|
|
2016-09-07 16:51:12 +03:00
|
|
|
INIT_DELAYED_WORK(&priv->restart_work, can_restart_work);
|
2009-05-15 23:39:29 +00:00
|
|
|
|
|
|
|
return dev;
|
|
|
|
}
|
2018-06-13 16:37:17 +02:00
|
|
|
EXPORT_SYMBOL_GPL(alloc_candev_mqs);
|
2009-05-15 23:39:29 +00:00
|
|
|
|
2019-08-27 13:46:41 +02:00
|
|
|
/* Free space of the CAN network device */
|
2009-05-15 23:39:29 +00:00
|
|
|
void free_candev(struct net_device *dev)
|
|
|
|
{
|
|
|
|
free_netdev(dev);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(free_candev);
|
|
|
|
|
2019-08-27 13:46:41 +02:00
|
|
|
/* changing MTU and control mode for CAN/CANFD devices */
|
2014-02-28 16:36:24 +01:00
|
|
|
int can_change_mtu(struct net_device *dev, int new_mtu)
|
|
|
|
{
|
|
|
|
struct can_priv *priv = netdev_priv(dev);
|
2021-12-14 01:02:23 +09:00
|
|
|
u32 ctrlmode_static = can_get_static_ctrlmode(priv);
|
2014-02-28 16:36:24 +01:00
|
|
|
|
|
|
|
/* Do not allow changing the MTU while running */
|
|
|
|
if (dev->flags & IFF_UP)
|
|
|
|
return -EBUSY;
|
|
|
|
|
|
|
|
/* allow change of MTU according to the CANFD ability of the device */
|
|
|
|
switch (new_mtu) {
|
|
|
|
case CAN_MTU:
|
2016-03-21 20:18:21 +01:00
|
|
|
/* 'CANFD-only' controllers can not switch to CAN_MTU */
|
2021-12-14 01:02:23 +09:00
|
|
|
if (ctrlmode_static & CAN_CTRLMODE_FD)
|
2016-03-21 20:18:21 +01:00
|
|
|
return -EINVAL;
|
|
|
|
|
2014-02-28 16:36:24 +01:00
|
|
|
priv->ctrlmode &= ~CAN_CTRLMODE_FD;
|
|
|
|
break;
|
|
|
|
|
|
|
|
case CANFD_MTU:
|
2016-03-21 20:18:21 +01:00
|
|
|
/* check for potential CANFD ability */
|
|
|
|
if (!(priv->ctrlmode_supported & CAN_CTRLMODE_FD) &&
|
2021-12-14 01:02:23 +09:00
|
|
|
!(ctrlmode_static & CAN_CTRLMODE_FD))
|
2014-02-28 16:36:24 +01:00
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
priv->ctrlmode |= CAN_CTRLMODE_FD;
|
|
|
|
break;
|
|
|
|
|
|
|
|
default:
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
dev->mtu = new_mtu;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(can_change_mtu);
|
|
|
|
|
2022-07-27 19:16:34 +09:00
|
|
|
/* generic implementation of ethtool_ops::get_ts_info for CAN devices
|
|
|
|
* supporting hardware timestamps
|
|
|
|
*/
|
|
|
|
int can_ethtool_op_get_ts_info_hwts(struct net_device *dev,
|
|
|
|
struct ethtool_ts_info *info)
|
|
|
|
{
|
|
|
|
info->so_timestamping =
|
|
|
|
SOF_TIMESTAMPING_TX_SOFTWARE |
|
|
|
|
SOF_TIMESTAMPING_RX_SOFTWARE |
|
|
|
|
SOF_TIMESTAMPING_SOFTWARE |
|
|
|
|
SOF_TIMESTAMPING_TX_HARDWARE |
|
|
|
|
SOF_TIMESTAMPING_RX_HARDWARE |
|
|
|
|
SOF_TIMESTAMPING_RAW_HARDWARE;
|
|
|
|
info->phc_index = -1;
|
|
|
|
info->tx_types = BIT(HWTSTAMP_TX_ON);
|
|
|
|
info->rx_filters = BIT(HWTSTAMP_FILTER_ALL);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(can_ethtool_op_get_ts_info_hwts);
|
|
|
|
|
2019-08-27 13:46:41 +02:00
|
|
|
/* Common open function when the device gets opened.
|
2009-05-15 23:39:29 +00:00
|
|
|
*
|
|
|
|
* This function should be called in the open function of the device
|
|
|
|
* driver.
|
|
|
|
*/
|
|
|
|
int open_candev(struct net_device *dev)
|
|
|
|
{
|
|
|
|
struct can_priv *priv = netdev_priv(dev);
|
|
|
|
|
2014-02-28 16:36:20 +01:00
|
|
|
if (!priv->bittiming.bitrate) {
|
2012-02-01 11:02:05 +01:00
|
|
|
netdev_err(dev, "bit-timing not yet defined\n");
|
2009-05-15 23:39:29 +00:00
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
2014-02-28 16:36:25 +01:00
|
|
|
/* For CAN FD the data bitrate has to be >= the arbitration bitrate */
|
|
|
|
if ((priv->ctrlmode & CAN_CTRLMODE_FD) &&
|
|
|
|
(!priv->data_bittiming.bitrate ||
|
2019-08-27 14:04:12 +02:00
|
|
|
priv->data_bittiming.bitrate < priv->bittiming.bitrate)) {
|
2014-02-28 16:36:25 +01:00
|
|
|
netdev_err(dev, "incorrect/missing data bit-timing\n");
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
2009-07-20 04:06:41 +00:00
|
|
|
/* Switch carrier on if device was stopped while in bus-off state */
|
|
|
|
if (!netif_carrier_ok(dev))
|
|
|
|
netif_carrier_on(dev);
|
|
|
|
|
2009-05-15 23:39:29 +00:00
|
|
|
return 0;
|
|
|
|
}
|
2009-05-30 07:55:48 +00:00
|
|
|
EXPORT_SYMBOL_GPL(open_candev);
|
2009-05-15 23:39:29 +00:00
|
|
|
|
2018-01-10 16:25:18 +05:30
|
|
|
#ifdef CONFIG_OF
|
|
|
|
/* Common function that can be used to understand the limitation of
|
|
|
|
* a transceiver when it provides no means to determine these limitations
|
|
|
|
* at runtime.
|
|
|
|
*/
|
|
|
|
void of_can_transceiver(struct net_device *dev)
|
|
|
|
{
|
|
|
|
struct device_node *dn;
|
|
|
|
struct can_priv *priv = netdev_priv(dev);
|
|
|
|
struct device_node *np = dev->dev.parent->of_node;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
dn = of_get_child_by_name(np, "can-transceiver");
|
|
|
|
if (!dn)
|
|
|
|
return;
|
|
|
|
|
|
|
|
ret = of_property_read_u32(dn, "max-bitrate", &priv->bitrate_max);
|
2019-09-28 22:29:05 +08:00
|
|
|
of_node_put(dn);
|
2018-01-10 16:25:18 +05:30
|
|
|
if ((ret && ret != -EINVAL) || (!ret && !priv->bitrate_max))
|
|
|
|
netdev_warn(dev, "Invalid value for transceiver max bitrate. Ignoring bitrate limit.\n");
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(of_can_transceiver);
|
|
|
|
#endif
|
|
|
|
|
2019-08-27 13:46:41 +02:00
|
|
|
/* Common close function for cleanup before the device gets closed.
|
2009-05-15 23:39:29 +00:00
|
|
|
*
|
|
|
|
* This function should be called in the close function of the device
|
|
|
|
* driver.
|
|
|
|
*/
|
|
|
|
void close_candev(struct net_device *dev)
|
|
|
|
{
|
|
|
|
struct can_priv *priv = netdev_priv(dev);
|
|
|
|
|
2016-09-07 16:51:12 +03:00
|
|
|
cancel_delayed_work_sync(&priv->restart_work);
|
2009-05-15 23:39:29 +00:00
|
|
|
can_flush_echo_skb(dev);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(close_candev);
|
|
|
|
|
2021-08-18 09:12:32 +02:00
|
|
|
static int can_set_termination(struct net_device *ndev, u16 term)
|
|
|
|
{
|
|
|
|
struct can_priv *priv = netdev_priv(ndev);
|
|
|
|
int set;
|
|
|
|
|
|
|
|
if (term == priv->termination_gpio_ohms[CAN_TERMINATION_GPIO_ENABLED])
|
|
|
|
set = 1;
|
|
|
|
else
|
|
|
|
set = 0;
|
|
|
|
|
|
|
|
gpiod_set_value(priv->termination_gpio, set);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int can_get_termination(struct net_device *ndev)
|
|
|
|
{
|
|
|
|
struct can_priv *priv = netdev_priv(ndev);
|
|
|
|
struct device *dev = ndev->dev.parent;
|
|
|
|
struct gpio_desc *gpio;
|
|
|
|
u32 term;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
/* Disabling termination by default is the safe choice: Else if many
|
|
|
|
* bus participants enable it, no communication is possible at all.
|
|
|
|
*/
|
|
|
|
gpio = devm_gpiod_get_optional(dev, "termination", GPIOD_OUT_LOW);
|
|
|
|
if (IS_ERR(gpio))
|
|
|
|
return dev_err_probe(dev, PTR_ERR(gpio),
|
|
|
|
"Cannot get termination-gpios\n");
|
|
|
|
|
|
|
|
if (!gpio)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
ret = device_property_read_u32(dev, "termination-ohms", &term);
|
|
|
|
if (ret) {
|
|
|
|
netdev_err(ndev, "Cannot get termination-ohms: %pe\n",
|
|
|
|
ERR_PTR(ret));
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (term > U16_MAX) {
|
|
|
|
netdev_err(ndev, "Invalid termination-ohms value (%u > %u)\n",
|
|
|
|
term, U16_MAX);
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
priv->termination_const_cnt = ARRAY_SIZE(priv->termination_gpio_ohms);
|
|
|
|
priv->termination_const = priv->termination_gpio_ohms;
|
|
|
|
priv->termination_gpio = gpio;
|
|
|
|
priv->termination_gpio_ohms[CAN_TERMINATION_GPIO_DISABLED] =
|
|
|
|
CAN_TERMINATION_DISABLED;
|
|
|
|
priv->termination_gpio_ohms[CAN_TERMINATION_GPIO_ENABLED] = term;
|
|
|
|
priv->do_set_termination = can_set_termination;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2019-08-27 13:46:41 +02:00
|
|
|
/* Register the CAN network device */
|
2009-05-15 23:39:29 +00:00
|
|
|
int register_candev(struct net_device *dev)
|
|
|
|
{
|
2017-01-10 18:52:06 +01:00
|
|
|
struct can_priv *priv = netdev_priv(dev);
|
2021-08-18 09:12:32 +02:00
|
|
|
int err;
|
2017-01-10 18:52:06 +01:00
|
|
|
|
|
|
|
/* Ensure termination_const, termination_const_cnt and
|
|
|
|
* do_set_termination consistency. All must be either set or
|
|
|
|
* unset.
|
|
|
|
*/
|
|
|
|
if ((!priv->termination_const != !priv->termination_const_cnt) ||
|
|
|
|
(!priv->termination_const != !priv->do_set_termination))
|
|
|
|
return -EINVAL;
|
|
|
|
|
2017-01-11 17:05:35 +01:00
|
|
|
if (!priv->bitrate_const != !priv->bitrate_const_cnt)
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
if (!priv->data_bitrate_const != !priv->data_bitrate_const_cnt)
|
|
|
|
return -EINVAL;
|
|
|
|
|
2021-08-18 09:12:32 +02:00
|
|
|
if (!priv->termination_const) {
|
|
|
|
err = can_get_termination(dev);
|
|
|
|
if (err)
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
2009-05-15 23:39:29 +00:00
|
|
|
dev->rtnl_link_ops = &can_link_ops;
|
2019-06-24 08:34:13 +00:00
|
|
|
netif_carrier_off(dev);
|
|
|
|
|
2009-05-15 23:39:29 +00:00
|
|
|
return register_netdev(dev);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(register_candev);
|
|
|
|
|
2019-08-27 13:46:41 +02:00
|
|
|
/* Unregister the CAN network device */
|
2009-05-15 23:39:29 +00:00
|
|
|
void unregister_candev(struct net_device *dev)
|
|
|
|
{
|
|
|
|
unregister_netdev(dev);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(unregister_candev);
|
|
|
|
|
2019-08-27 13:46:41 +02:00
|
|
|
/* Test if a network device is a candev based device
|
2012-12-18 18:50:56 +01:00
|
|
|
* and return the can_priv* if so.
|
|
|
|
*/
|
|
|
|
struct can_priv *safe_candev_priv(struct net_device *dev)
|
|
|
|
{
|
2019-08-27 14:04:12 +02:00
|
|
|
if (dev->type != ARPHRD_CAN || dev->rtnl_link_ops != &can_link_ops)
|
2012-12-18 18:50:56 +01:00
|
|
|
return NULL;
|
|
|
|
|
|
|
|
return netdev_priv(dev);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(safe_candev_priv);
|
|
|
|
|
2009-05-15 23:39:29 +00:00
|
|
|
static __init int can_dev_init(void)
|
|
|
|
{
|
|
|
|
int err;
|
|
|
|
|
2021-01-11 15:19:21 +01:00
|
|
|
err = can_netlink_register();
|
2009-05-15 23:39:29 +00:00
|
|
|
if (!err)
|
2022-06-10 23:30:04 +09:00
|
|
|
pr_info("CAN device driver interface\n");
|
2009-05-15 23:39:29 +00:00
|
|
|
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
module_init(can_dev_init);
|
|
|
|
|
|
|
|
static __exit void can_dev_exit(void)
|
|
|
|
{
|
2021-01-11 15:19:21 +01:00
|
|
|
can_netlink_unregister();
|
2009-05-15 23:39:29 +00:00
|
|
|
}
|
|
|
|
module_exit(can_dev_exit);
|
|
|
|
|
|
|
|
MODULE_ALIAS_RTNL_LINK("can");
|