2010-03-02 04:23:42 -07:00
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/*
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* i2c-smbus.c - SMBus extensions to the I2C protocol
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*
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* Copyright (C) 2008 David Brownell
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2014-01-29 12:40:08 -07:00
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* Copyright (C) 2010 Jean Delvare <jdelvare@suse.de>
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2010-03-02 04:23:42 -07:00
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/device.h>
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#include <linux/i2c.h>
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#include <linux/i2c-smbus.h>
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2016-02-20 15:33:39 -07:00
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/module.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 02:04:11 -06:00
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#include <linux/slab.h>
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2016-02-20 15:33:39 -07:00
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#include <linux/workqueue.h>
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2010-03-02 04:23:42 -07:00
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struct i2c_smbus_alert {
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unsigned int alert_edge_triggered:1;
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int irq;
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struct work_struct alert;
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struct i2c_client *ara; /* Alert response address */
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};
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struct alert_data {
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unsigned short addr;
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2016-06-09 08:53:48 -06:00
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enum i2c_alert_protocol type;
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unsigned int data;
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2010-03-02 04:23:42 -07:00
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};
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/* If this is the alerting device, notify its driver */
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static int smbus_do_alert(struct device *dev, void *addrp)
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{
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struct i2c_client *client = i2c_verify_client(dev);
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struct alert_data *data = addrp;
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2013-09-29 02:51:06 -06:00
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struct i2c_driver *driver;
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2010-03-02 04:23:42 -07:00
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if (!client || client->addr != data->addr)
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return 0;
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if (client->flags & I2C_CLIENT_TEN)
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return 0;
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/*
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* Drivers should either disable alerts, or provide at least
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2013-09-29 02:51:06 -06:00
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* a minimal handler. Lock so the driver won't change.
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2010-03-02 04:23:42 -07:00
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*/
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2010-02-28 22:04:45 -07:00
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device_lock(dev);
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2013-09-29 02:51:06 -06:00
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if (client->dev.driver) {
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driver = to_i2c_driver(client->dev.driver);
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if (driver->alert)
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2016-06-09 08:53:48 -06:00
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driver->alert(client, data->type, data->data);
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2010-03-02 04:23:42 -07:00
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else
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dev_warn(&client->dev, "no driver alert()!\n");
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} else
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dev_dbg(&client->dev, "alert with no driver\n");
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2010-02-28 22:04:45 -07:00
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device_unlock(dev);
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2010-03-02 04:23:42 -07:00
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/* Stop iterating after we find the device */
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return -EBUSY;
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}
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/*
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* The alert IRQ handler needs to hand work off to a task which can issue
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* SMBus calls, because those sleeping calls can't be made in IRQ context.
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*/
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static void smbus_alert(struct work_struct *work)
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{
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struct i2c_smbus_alert *alert;
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struct i2c_client *ara;
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unsigned short prev_addr = 0; /* Not a valid address */
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alert = container_of(work, struct i2c_smbus_alert, alert);
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ara = alert->ara;
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for (;;) {
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s32 status;
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struct alert_data data;
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/*
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* Devices with pending alerts reply in address order, low
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* to high, because of slave transmit arbitration. After
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* responding, an SMBus device stops asserting SMBALERT#.
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*
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2015-05-19 08:39:41 -06:00
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* Note that SMBus 2.0 reserves 10-bit addresses for future
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2010-03-02 04:23:42 -07:00
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* use. We neither handle them, nor try to use PEC here.
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*/
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status = i2c_smbus_read_byte(ara);
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if (status < 0)
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break;
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2016-06-09 08:53:48 -06:00
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data.data = status & 1;
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2010-03-02 04:23:42 -07:00
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data.addr = status >> 1;
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2016-06-09 08:53:48 -06:00
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data.type = I2C_PROTOCOL_SMBUS_ALERT;
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2010-03-02 04:23:42 -07:00
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if (data.addr == prev_addr) {
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dev_warn(&ara->dev, "Duplicate SMBALERT# from dev "
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"0x%02x, skipping\n", data.addr);
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break;
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}
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dev_dbg(&ara->dev, "SMBALERT# from dev 0x%02x, flag %d\n",
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2016-06-09 08:53:48 -06:00
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data.addr, data.data);
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2010-03-02 04:23:42 -07:00
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/* Notify driver for the device which issued the alert */
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device_for_each_child(&ara->adapter->dev, &data,
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smbus_do_alert);
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prev_addr = data.addr;
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}
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/* We handled all alerts; re-enable level-triggered IRQs */
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if (!alert->alert_edge_triggered)
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enable_irq(alert->irq);
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}
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static irqreturn_t smbalert_irq(int irq, void *d)
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{
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struct i2c_smbus_alert *alert = d;
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/* Disable level-triggered IRQs until we handle them */
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if (!alert->alert_edge_triggered)
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disable_irq_nosync(irq);
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schedule_work(&alert->alert);
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return IRQ_HANDLED;
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}
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/* Setup SMBALERT# infrastructure */
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static int smbalert_probe(struct i2c_client *ara,
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const struct i2c_device_id *id)
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{
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2013-07-30 01:59:33 -06:00
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struct i2c_smbus_alert_setup *setup = dev_get_platdata(&ara->dev);
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2010-03-02 04:23:42 -07:00
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struct i2c_smbus_alert *alert;
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struct i2c_adapter *adapter = ara->adapter;
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int res;
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i2c-smbus: Convert kzalloc to devm_kzalloc
Converting kzalloc to devm_kzalloc simplifies the code and ensures that the
result, alert, is freed after the irq allocated by the subsequent
devm_request_irq. This in turn ensures that when an interrupt can be
triggered, the alert structure is still available.
The problem of a free after a devm_request_irq was found using the
following semantic match (http://coccinelle.lip6.fr/)
// <smpl>
@r exists@
expression e1,e2,x,a,b,c,d;
identifier free;
position p1,p2;
@@
devm_request_irq@p1(e1,e2,...,x)
... when any
when != e2 = a
when != x = b
if (...) {
... when != e2 = c
when != x = d
free@p2(...,x,...);
...
return ...;
}
// </smpl>
Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
2012-10-05 14:23:52 -06:00
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alert = devm_kzalloc(&ara->dev, sizeof(struct i2c_smbus_alert),
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GFP_KERNEL);
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2010-03-02 04:23:42 -07:00
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if (!alert)
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return -ENOMEM;
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alert->alert_edge_triggered = setup->alert_edge_triggered;
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alert->irq = setup->irq;
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INIT_WORK(&alert->alert, smbus_alert);
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alert->ara = ara;
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if (setup->irq > 0) {
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res = devm_request_irq(&ara->dev, setup->irq, smbalert_irq,
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0, "smbus_alert", alert);
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i2c-smbus: Convert kzalloc to devm_kzalloc
Converting kzalloc to devm_kzalloc simplifies the code and ensures that the
result, alert, is freed after the irq allocated by the subsequent
devm_request_irq. This in turn ensures that when an interrupt can be
triggered, the alert structure is still available.
The problem of a free after a devm_request_irq was found using the
following semantic match (http://coccinelle.lip6.fr/)
// <smpl>
@r exists@
expression e1,e2,x,a,b,c,d;
identifier free;
position p1,p2;
@@
devm_request_irq@p1(e1,e2,...,x)
... when any
when != e2 = a
when != x = b
if (...) {
... when != e2 = c
when != x = d
free@p2(...,x,...);
...
return ...;
}
// </smpl>
Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
2012-10-05 14:23:52 -06:00
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if (res)
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2010-03-02 04:23:42 -07:00
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return res;
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}
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i2c_set_clientdata(ara, alert);
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dev_info(&adapter->dev, "supports SMBALERT#, %s trigger\n",
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setup->alert_edge_triggered ? "edge" : "level");
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return 0;
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}
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i2c-smbus: Convert kzalloc to devm_kzalloc
Converting kzalloc to devm_kzalloc simplifies the code and ensures that the
result, alert, is freed after the irq allocated by the subsequent
devm_request_irq. This in turn ensures that when an interrupt can be
triggered, the alert structure is still available.
The problem of a free after a devm_request_irq was found using the
following semantic match (http://coccinelle.lip6.fr/)
// <smpl>
@r exists@
expression e1,e2,x,a,b,c,d;
identifier free;
position p1,p2;
@@
devm_request_irq@p1(e1,e2,...,x)
... when any
when != e2 = a
when != x = b
if (...) {
... when != e2 = c
when != x = d
free@p2(...,x,...);
...
return ...;
}
// </smpl>
Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
2012-10-05 14:23:52 -06:00
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/* IRQ and memory resources are managed so they are freed automatically */
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2010-03-02 04:23:42 -07:00
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static int smbalert_remove(struct i2c_client *ara)
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{
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struct i2c_smbus_alert *alert = i2c_get_clientdata(ara);
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cancel_work_sync(&alert->alert);
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return 0;
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}
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static const struct i2c_device_id smbalert_ids[] = {
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{ "smbus_alert", 0 },
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{ /* LIST END */ }
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};
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MODULE_DEVICE_TABLE(i2c, smbalert_ids);
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static struct i2c_driver smbalert_driver = {
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.driver = {
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.name = "smbus_alert",
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},
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.probe = smbalert_probe,
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.remove = smbalert_remove,
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.id_table = smbalert_ids,
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};
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/**
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* i2c_setup_smbus_alert - Setup SMBus alert support
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* @adapter: the target adapter
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* @setup: setup data for the SMBus alert handler
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* Context: can sleep
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*
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* Setup handling of the SMBus alert protocol on a given I2C bus segment.
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*
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* Handling can be done either through our IRQ handler, or by the
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* adapter (from its handler, periodic polling, or whatever).
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*
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* NOTE that if we manage the IRQ, we *MUST* know if it's level or
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* edge triggered in order to hand it to the workqueue correctly.
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* If triggering the alert seems to wedge the system, you probably
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* should have said it's level triggered.
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*
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* This returns the ara client, which should be saved for later use with
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* i2c_handle_smbus_alert() and ultimately i2c_unregister_device(); or NULL
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* to indicate an error.
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*/
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struct i2c_client *i2c_setup_smbus_alert(struct i2c_adapter *adapter,
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struct i2c_smbus_alert_setup *setup)
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{
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struct i2c_board_info ara_board_info = {
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I2C_BOARD_INFO("smbus_alert", 0x0c),
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.platform_data = setup,
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};
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return i2c_new_device(adapter, &ara_board_info);
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}
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EXPORT_SYMBOL_GPL(i2c_setup_smbus_alert);
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/**
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* i2c_handle_smbus_alert - Handle an SMBus alert
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* @ara: the ARA client on the relevant adapter
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* Context: can't sleep
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*
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* Helper function to be called from an I2C bus driver's interrupt
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* handler. It will schedule the alert work, in turn calling the
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* corresponding I2C device driver's alert function.
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*
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* It is assumed that ara is a valid i2c client previously returned by
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* i2c_setup_smbus_alert().
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*/
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int i2c_handle_smbus_alert(struct i2c_client *ara)
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{
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struct i2c_smbus_alert *alert = i2c_get_clientdata(ara);
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return schedule_work(&alert->alert);
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}
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EXPORT_SYMBOL_GPL(i2c_handle_smbus_alert);
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|
2016-06-09 08:53:48 -06:00
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|
|
static void smbus_host_notify_work(struct work_struct *work)
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{
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struct alert_data alert;
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struct i2c_adapter *adapter;
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unsigned long flags;
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u16 payload;
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u8 addr;
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struct smbus_host_notify *data;
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data = container_of(work, struct smbus_host_notify, work);
|
|
|
|
|
|
|
|
spin_lock_irqsave(&data->lock, flags);
|
|
|
|
payload = data->payload;
|
|
|
|
addr = data->addr;
|
|
|
|
adapter = data->adapter;
|
|
|
|
|
|
|
|
/* clear the pending bit and release the spinlock */
|
|
|
|
data->pending = false;
|
|
|
|
spin_unlock_irqrestore(&data->lock, flags);
|
|
|
|
|
|
|
|
if (!adapter || !addr)
|
|
|
|
return;
|
|
|
|
|
|
|
|
alert.type = I2C_PROTOCOL_SMBUS_HOST_NOTIFY;
|
|
|
|
alert.addr = addr;
|
|
|
|
alert.data = payload;
|
|
|
|
|
|
|
|
device_for_each_child(&adapter->dev, &alert, smbus_do_alert);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* i2c_setup_smbus_host_notify - Allocate a new smbus_host_notify for the given
|
|
|
|
* I2C adapter.
|
|
|
|
* @adapter: the adapter we want to associate a Host Notify function
|
|
|
|
*
|
|
|
|
* Returns a struct smbus_host_notify pointer on success, and NULL on failure.
|
|
|
|
* The resulting smbus_host_notify must not be freed afterwards, it is a
|
|
|
|
* managed resource already.
|
|
|
|
*/
|
|
|
|
struct smbus_host_notify *i2c_setup_smbus_host_notify(struct i2c_adapter *adap)
|
|
|
|
{
|
|
|
|
struct smbus_host_notify *host_notify;
|
|
|
|
|
|
|
|
host_notify = devm_kzalloc(&adap->dev, sizeof(struct smbus_host_notify),
|
|
|
|
GFP_KERNEL);
|
|
|
|
if (!host_notify)
|
|
|
|
return NULL;
|
|
|
|
|
|
|
|
host_notify->adapter = adap;
|
|
|
|
|
|
|
|
spin_lock_init(&host_notify->lock);
|
|
|
|
INIT_WORK(&host_notify->work, smbus_host_notify_work);
|
|
|
|
|
|
|
|
return host_notify;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(i2c_setup_smbus_host_notify);
|
|
|
|
|
|
|
|
/**
|
|
|
|
* i2c_handle_smbus_host_notify - Forward a Host Notify event to the correct
|
|
|
|
* I2C client.
|
|
|
|
* @host_notify: the struct host_notify attached to the relevant adapter
|
2016-07-16 07:45:23 -06:00
|
|
|
* @addr: the I2C address of the notifying device
|
|
|
|
* @data: the payload of the notification
|
2016-06-09 08:53:48 -06:00
|
|
|
* Context: can't sleep
|
|
|
|
*
|
|
|
|
* Helper function to be called from an I2C bus driver's interrupt
|
|
|
|
* handler. It will schedule the Host Notify work, in turn calling the
|
|
|
|
* corresponding I2C device driver's alert function.
|
|
|
|
*
|
|
|
|
* host_notify should be a valid pointer previously returned by
|
|
|
|
* i2c_setup_smbus_host_notify().
|
|
|
|
*/
|
|
|
|
int i2c_handle_smbus_host_notify(struct smbus_host_notify *host_notify,
|
|
|
|
unsigned short addr, unsigned int data)
|
|
|
|
{
|
|
|
|
unsigned long flags;
|
|
|
|
struct i2c_adapter *adapter;
|
|
|
|
|
|
|
|
if (!host_notify || !host_notify->adapter)
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
adapter = host_notify->adapter;
|
|
|
|
|
|
|
|
spin_lock_irqsave(&host_notify->lock, flags);
|
|
|
|
|
|
|
|
if (host_notify->pending) {
|
|
|
|
spin_unlock_irqrestore(&host_notify->lock, flags);
|
|
|
|
dev_warn(&adapter->dev, "Host Notify already scheduled.\n");
|
|
|
|
return -EBUSY;
|
|
|
|
}
|
|
|
|
|
|
|
|
host_notify->payload = data;
|
|
|
|
host_notify->addr = addr;
|
|
|
|
|
|
|
|
/* Mark that there is a pending notification and release the lock */
|
|
|
|
host_notify->pending = true;
|
|
|
|
spin_unlock_irqrestore(&host_notify->lock, flags);
|
|
|
|
|
|
|
|
return schedule_work(&host_notify->work);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(i2c_handle_smbus_host_notify);
|
|
|
|
|
2012-07-24 06:13:57 -06:00
|
|
|
module_i2c_driver(smbalert_driver);
|
2010-03-02 04:23:42 -07:00
|
|
|
|
2014-01-29 12:40:08 -07:00
|
|
|
MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>");
|
2010-03-02 04:23:42 -07:00
|
|
|
MODULE_DESCRIPTION("SMBus protocol extensions support");
|
|
|
|
MODULE_LICENSE("GPL");
|