From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758074AbcLCAnx (ORCPT ); Fri, 2 Dec 2016 19:43:53 -0500 Received: from us-mx1.synaptics.com ([192.147.44.131]:6376 "EHLO us-mx1.synaptics.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753150AbcLCAnt (ORCPT ); Fri, 2 Dec 2016 19:43:49 -0500 X-Greylist: delayed 600 seconds by postgrey-1.27 at vger.kernel.org; Fri, 02 Dec 2016 19:43:49 EST Subject: Re: [PATCH v2 3/7] Input: synaptics-rmi4 - allow to add attention data To: Benjamin Tissoires , Dmitry Torokhov , Jiri Kosina , Lyude Paul , Nick Dyer , Dennis Wassenberg References: <1480678916-6469-1-git-send-email-benjamin.tissoires@redhat.com> <1480678916-6469-4-git-send-email-benjamin.tissoires@redhat.com> CC: , From: Andrew Duggan Message-ID: <82ac36db-7e4e-f681-971e-88180efacb0c@synaptics.com> Date: Fri, 2 Dec 2016 16:33:56 -0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.4.0 MIME-Version: 1.0 In-Reply-To: <1480678916-6469-4-git-send-email-benjamin.tissoires@redhat.com> Content-Type: text/plain; charset="windows-1252"; format=flowed Content-Transfer-Encoding: 7bit X-Originating-IP: [10.4.10.103] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 12/02/2016 03:41 AM, Benjamin Tissoires wrote: > The HID implementation of RMI4 provides the data during > the interrupt (in the input report). We need to provide > a way for this transport driver to provide the attention > data while calling an IRQ. > > We use a fifo in rmi_core to not lose any incoming event. > > Signed-off-by: Benjamin Tissoires Reviewed-by: Andrew Duggan > --- > > no changes in v2 > --- > drivers/input/rmi4/rmi_driver.c | 49 +++++++++++++++++++++++++++++++++++++++-- > include/linux/rmi.h | 11 +++++++++ > 2 files changed, 58 insertions(+), 2 deletions(-) > > diff --git a/drivers/input/rmi4/rmi_driver.c b/drivers/input/rmi4/rmi_driver.c > index a718e51..85062e4 100644 > --- a/drivers/input/rmi4/rmi_driver.c > +++ b/drivers/input/rmi4/rmi_driver.c > @@ -191,16 +191,53 @@ static int rmi_process_interrupt_requests(struct rmi_device *rmi_dev) > return 0; > } > > +void rmi_set_attn_data(struct rmi_device *rmi_dev, unsigned long irq_status, > + void *data, size_t size) > +{ > + struct rmi_driver_data *drvdata = dev_get_drvdata(&rmi_dev->dev); > + struct rmi4_attn_data attn_data; > + void *fifo_data; > + > + if (!drvdata->enabled) > + return; > + > + fifo_data = kmemdup(data, size, GFP_ATOMIC); > + if (!fifo_data) > + return; > + > + attn_data.irq_status = irq_status; > + attn_data.size = size; > + attn_data.data = fifo_data; > + > + kfifo_put(&drvdata->attn_fifo, attn_data); > +} > +EXPORT_SYMBOL_GPL(rmi_set_attn_data); > + > static irqreturn_t rmi_irq_fn(int irq, void *dev_id) > { > struct rmi_device *rmi_dev = dev_id; > - int ret; > + struct rmi_driver_data *drvdata = dev_get_drvdata(&rmi_dev->dev); > + struct rmi4_attn_data attn_data = {0}; > + int ret, count; > + > + count = kfifo_get(&drvdata->attn_fifo, &attn_data); > + if (count) { > + *(drvdata->irq_status) = attn_data.irq_status; > + rmi_dev->xport->attn_data = attn_data.data; > + rmi_dev->xport->attn_size = attn_data.size; > + } > > ret = rmi_process_interrupt_requests(rmi_dev); > if (ret) > rmi_dbg(RMI_DEBUG_CORE, &rmi_dev->dev, > "Failed to process interrupt request: %d\n", ret); > > + if (count) > + kfree(attn_data.data); > + > + if (!kfifo_is_empty(&drvdata->attn_fifo)) > + return rmi_irq_fn(irq, dev_id); > + > return IRQ_HANDLED; > } > > @@ -880,8 +917,9 @@ void rmi_disable_irq(struct rmi_device *rmi_dev, bool enable_wake) > { > struct rmi_device_platform_data *pdata = rmi_get_platform_data(rmi_dev); > struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev); > + struct rmi4_attn_data attn_data = {0}; > int irq = pdata->irq; > - int retval; > + int retval, count; > > mutex_lock(&data->enabled_mutex); > > @@ -898,6 +936,13 @@ void rmi_disable_irq(struct rmi_device *rmi_dev, bool enable_wake) > retval); > } > > + /* make sure the fifo is clean */ > + while (!kfifo_is_empty(&data->attn_fifo)) { > + count = kfifo_get(&data->attn_fifo, &attn_data); > + if (count) > + kfree(attn_data.data); > + } > + > out: > mutex_unlock(&data->enabled_mutex); > } > diff --git a/include/linux/rmi.h b/include/linux/rmi.h > index 7780e40..1d48656 100644 > --- a/include/linux/rmi.h > +++ b/include/linux/rmi.h > @@ -13,6 +13,7 @@ > #include > #include > #include > +#include > #include > #include > #include > @@ -331,6 +332,12 @@ struct rmi_device { > > }; > > +struct rmi4_attn_data { > + unsigned long irq_status; > + size_t size; > + void *data; > +}; > + > struct rmi_driver_data { > struct list_head function_list; > > @@ -357,11 +364,15 @@ struct rmi_driver_data { > > bool enabled; > struct mutex enabled_mutex; > + DECLARE_KFIFO(attn_fifo, struct rmi4_attn_data, 16); > }; > > int rmi_register_transport_device(struct rmi_transport_dev *xport); > void rmi_unregister_transport_device(struct rmi_transport_dev *xport); > > +void rmi_set_attn_data(struct rmi_device *rmi_dev, unsigned long irq_status, > + void *data, size_t size); > + > int rmi_driver_suspend(struct rmi_device *rmi_dev, bool enable_wake); > int rmi_driver_resume(struct rmi_device *rmi_dev, bool clear_wake); > #endif