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Date: Mon, 20 Jun 2016 18:20:19 +0200
From: Hans Verkuil <hverkuil@...all.nl>
To: Nick Dyer <nick.dyer@...ev.co.uk>,
Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc: linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-media@...r.kernel.org,
Benjamin Tissoires <benjamin.tissoires@...hat.com>,
Benson Leung <bleung@...omium.org>,
Alan Bowens <Alan.Bowens@...el.com>,
Javier Martinez Canillas <javier@....samsung.com>,
Chris Healy <cphealy@...il.com>,
Henrik Rydberg <rydberg@...math.org>,
Andrew Duggan <aduggan@...aptics.com>,
James Chen <james.chen@....com.tw>,
Dudley Du <dudl@...ress.com>,
Andrew de los Reyes <adlr@...omium.org>,
sheckylin@...omium.org, Peter Hutterer <peter.hutterer@...-t.net>,
Florian Echtler <floe@...terbrot.org>, mchehab@....samsung.com
Subject: Re: [PATCH v4 9/9] Input: synaptics-rmi4 - add support for F54
diagnostics
On 06/17/2016 04:16 PM, Nick Dyer wrote:
> Function 54 implements access to various RMI4 diagnostic features.
>
> This patch adds support for retrieving this data. It registers a V4L2
> device to output the data to user space.
>
> Signed-off-by: Nick Dyer <nick.dyer@...ev.co.uk>
> ---
> drivers/input/rmi4/Kconfig | 11 +
> drivers/input/rmi4/Makefile | 1 +
> drivers/input/rmi4/rmi_bus.c | 3 +
> drivers/input/rmi4/rmi_driver.h | 1 +
> drivers/input/rmi4/rmi_f54.c | 743 ++++++++++++++++++++++++++++++++++++++++
> 5 files changed, 759 insertions(+)
> create mode 100644 drivers/input/rmi4/rmi_f54.c
>
> diff --git a/drivers/input/rmi4/Kconfig b/drivers/input/rmi4/Kconfig
> index f73df24..f3418b6 100644
> --- a/drivers/input/rmi4/Kconfig
> +++ b/drivers/input/rmi4/Kconfig
> @@ -61,3 +61,14 @@ config RMI4_F30
>
> Function 30 provides GPIO and LED support for RMI4 devices. This
> includes support for buttons on TouchPads and ClickPads.
> +
> +config RMI4_F54
> + bool "RMI4 Function 54 (Analog diagnostics)"
> + depends on RMI4_CORE
> + depends on VIDEO_V4L2
> + select VIDEOBUF2_VMALLOC
> + help
> + Say Y here if you want to add support for RMI4 function 54
> +
> + Function 54 provides access to various diagnostic features in certain
> + RMI4 touch sensors.
> diff --git a/drivers/input/rmi4/Makefile b/drivers/input/rmi4/Makefile
> index 95c00a7..0bafc85 100644
> --- a/drivers/input/rmi4/Makefile
> +++ b/drivers/input/rmi4/Makefile
> @@ -7,6 +7,7 @@ rmi_core-$(CONFIG_RMI4_2D_SENSOR) += rmi_2d_sensor.o
> rmi_core-$(CONFIG_RMI4_F11) += rmi_f11.o
> rmi_core-$(CONFIG_RMI4_F12) += rmi_f12.o
> rmi_core-$(CONFIG_RMI4_F30) += rmi_f30.o
> +rmi_core-$(CONFIG_RMI4_F54) += rmi_f54.o
>
> # Transports
> obj-$(CONFIG_RMI4_I2C) += rmi_i2c.o
> diff --git a/drivers/input/rmi4/rmi_bus.c b/drivers/input/rmi4/rmi_bus.c
> index b368b05..3aedc65 100644
> --- a/drivers/input/rmi4/rmi_bus.c
> +++ b/drivers/input/rmi4/rmi_bus.c
> @@ -315,6 +315,9 @@ static struct rmi_function_handler *fn_handlers[] = {
> #ifdef CONFIG_RMI4_F30
> &rmi_f30_handler,
> #endif
> +#ifdef CONFIG_RMI4_F54
> + &rmi_f54_handler,
> +#endif
> };
>
> static void __rmi_unregister_function_handlers(int start_idx)
> diff --git a/drivers/input/rmi4/rmi_driver.h b/drivers/input/rmi4/rmi_driver.h
> index 6e140fa..8dfbebe 100644
> --- a/drivers/input/rmi4/rmi_driver.h
> +++ b/drivers/input/rmi4/rmi_driver.h
> @@ -102,4 +102,5 @@ extern struct rmi_function_handler rmi_f01_handler;
> extern struct rmi_function_handler rmi_f11_handler;
> extern struct rmi_function_handler rmi_f12_handler;
> extern struct rmi_function_handler rmi_f30_handler;
> +extern struct rmi_function_handler rmi_f54_handler;
> #endif
> diff --git a/drivers/input/rmi4/rmi_f54.c b/drivers/input/rmi4/rmi_f54.c
> new file mode 100644
> index 0000000..bd06788
> --- /dev/null
> +++ b/drivers/input/rmi4/rmi_f54.c
> @@ -0,0 +1,743 @@
> +/*
> + * Copyright (c) 2012-2015 Synaptics Incorporated
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License version 2 as published by
> + * the Free Software Foundation.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/rmi.h>
> +#include <linux/input.h>
> +#include <linux/slab.h>
> +#include <linux/delay.h>
> +#include <linux/i2c.h>
> +#include <media/v4l2-device.h>
> +#include <media/v4l2-ioctl.h>
> +#include <media/videobuf2-v4l2.h>
> +#include <media/videobuf2-vmalloc.h>
> +#include "rmi_driver.h"
> +
> +#define F54_NAME "rmi4_f54"
> +
> +/* F54 data offsets */
> +#define F54_REPORT_DATA_OFFSET 3
> +#define F54_FIFO_OFFSET 1
> +#define F54_NUM_TX_OFFSET 1
> +#define F54_NUM_RX_OFFSET 0
> +
> +/* F54 commands */
> +#define F54_GET_REPORT 1
> +#define F54_FORCE_CAL 2
> +
> +/* Fixed sizes of reports */
> +#define F54_QUERY_LEN 27
> +#define F54_FULL_RAW_CAP_MIN_MAX_SIZE 4
> +#define F54_HIGH_RESISTANCE_SIZE(rx, tx) \
> + (2 * ((rx) * (tx) + (rx) + (tx) + 3))
> +#define F54_MAX_REPORT_SIZE(rx, tx) F54_HIGH_RESISTANCE_SIZE((rx), (tx))
> +
> +/* F54 capabilities */
> +#define F54_CAP_BASELINE (1 << 2)
> +#define F54_CAP_IMAGE8 (1 << 3)
> +#define F54_CAP_IMAGE16 (1 << 6)
> +
> +enum f54_report_type {
> + F54_REPORT_NONE = 0,
> + F54_8BIT_IMAGE = 1,
> + F54_16BIT_IMAGE = 2,
> + F54_RAW_16BIT_IMAGE = 3,
> + F54_HIGH_RESISTANCE = 4,
> + F54_TX_TO_TX_SHORT = 5,
> + F54_RX_TO_RX1 = 7,
> + F54_TRUE_BASELINE = 9,
> + F54_FULL_RAW_CAP_MIN_MAX = 13,
> + F54_RX_OPENS1 = 14,
> + F54_TX_OPEN = 15,
> + F54_TX_TO_GROUND = 16,
> + F54_RX_TO_RX2 = 17,
> + F54_RX_OPENS2 = 18,
> + F54_FULL_RAW_CAP = 19,
> + F54_FULL_RAW_CAP_RX_COUPLING_COMP = 20,
> + F54_MAX_REPORT_TYPE,
> +};
> +
> +struct f54_data {
> + struct rmi_function *fn;
> +
> + u8 qry[F54_QUERY_LEN];
> + u8 num_rx_electrodes;
> + u8 num_tx_electrodes;
> + u8 capabilities;
> + u16 clock_rate;
> + u8 family;
> +
> + enum f54_report_type report_type;
> + u8 *report_data;
> + int report_size;
> +
> + bool is_busy;
> + struct mutex status_mutex;
> + struct mutex data_mutex;
> +
> + struct workqueue_struct *workqueue;
> + struct delayed_work work;
> + unsigned long timeout;
> +
> + struct completion cmd_done;
> +
> + /* V4L2 support */
> + struct v4l2_device v4l2;
> + struct v4l2_pix_format format;
> + struct video_device vdev;
> + struct vb2_queue queue;
> + struct mutex lock;
> + int input;
> + enum f54_report_type inputs[F54_MAX_REPORT_TYPE];
> +};
> +
> +/*
> + * Basic checks on report_type to ensure we write a valid type
> + * to the sensor.
> + */
> +static bool is_f54_report_type_valid(struct f54_data *f54,
> + enum f54_report_type reptype)
> +{
> + switch (reptype) {
> + case F54_8BIT_IMAGE:
> + return f54->capabilities & F54_CAP_IMAGE8;
> + case F54_16BIT_IMAGE:
> + case F54_RAW_16BIT_IMAGE:
> + return f54->capabilities & F54_CAP_IMAGE16;
> + case F54_TRUE_BASELINE:
> + return f54->capabilities & F54_CAP_IMAGE16;
> + case F54_HIGH_RESISTANCE:
> + case F54_TX_TO_TX_SHORT:
> + case F54_RX_TO_RX1:
> + case F54_FULL_RAW_CAP_MIN_MAX:
> + case F54_RX_OPENS1:
> + case F54_TX_OPEN:
> + case F54_TX_TO_GROUND:
> + case F54_RX_TO_RX2:
> + case F54_RX_OPENS2:
> + case F54_FULL_RAW_CAP:
> + case F54_FULL_RAW_CAP_RX_COUPLING_COMP:
> + return true;
> + default:
> + return false;
> + }
> +}
> +
> +static enum f54_report_type rmi_f54_get_reptype(struct f54_data *f54,
> + unsigned int i)
> +{
> + if (i > F54_MAX_REPORT_TYPE)
This should be >=
> + return F54_REPORT_NONE;
> +
> + return f54->inputs[i];
> +}
> +
> +static void rmi_f54_create_input_map(struct f54_data *f54)
> +{
> + int i = 0;
> + enum f54_report_type reptype;
> +
> + for (reptype = 1; reptype < F54_MAX_REPORT_TYPE; reptype++) {
> + if (!is_f54_report_type_valid(f54, reptype))
> + continue;
> +
> + f54->inputs[i++] = reptype;
> + }
> +
> + /* Remaining values are zero via kzalloc */
> +}
> +
> +static int rmi_f54_request_report(struct rmi_function *fn, u8 report_type)
> +{
> + struct f54_data *f54 = dev_get_drvdata(&fn->dev);
> + struct rmi_device *rmi_dev = fn->rmi_dev;
> + int error;
> +
> + /* Write Report Type into F54_AD_Data0 */
> + if (f54->report_type != report_type) {
> + error = rmi_write(rmi_dev, f54->fn->fd.data_base_addr,
> + report_type);
> + if (error)
> + return error;
> + f54->report_type = report_type;
> + }
> +
> + /*
> + * Small delay after disabling interrupts to avoid race condition
> + * in firmare. This value is a bit higher than absolutely necessary.
> + * Should be removed once issue is resolved in firmware.
> + */
> + usleep_range(2000, 3000);
> +
> + mutex_lock(&f54->data_mutex);
> +
> + error = rmi_write(rmi_dev, fn->fd.command_base_addr, F54_GET_REPORT);
> + if (error < 0)
> + return error;
> +
> + init_completion(&f54->cmd_done);
> +
> + f54->is_busy = 1;
> + f54->timeout = jiffies + msecs_to_jiffies(100);
> +
> + queue_delayed_work(f54->workqueue, &f54->work, 0);
> +
> + mutex_unlock(&f54->data_mutex);
> +
> + return 0;
> +}
> +
> +static int rmi_f54_get_report_size(struct f54_data *f54)
> +{
> + u8 rx = f54->num_rx_electrodes ? : f54->num_rx_electrodes;
> + u8 tx = f54->num_tx_electrodes ? : f54->num_tx_electrodes;
> + int size;
> +
> + switch (rmi_f54_get_reptype(f54, f54->input)) {
> + case F54_8BIT_IMAGE:
> + size = rx * tx;
> + break;
> + case F54_16BIT_IMAGE:
> + case F54_RAW_16BIT_IMAGE:
> + case F54_TRUE_BASELINE:
> + case F54_FULL_RAW_CAP:
> + case F54_FULL_RAW_CAP_RX_COUPLING_COMP:
> + size = 2 * rx * tx;
> + break;
> + case F54_HIGH_RESISTANCE:
> + size = F54_HIGH_RESISTANCE_SIZE(rx, tx);
> + break;
> + case F54_FULL_RAW_CAP_MIN_MAX:
> + size = F54_FULL_RAW_CAP_MIN_MAX_SIZE;
> + break;
> + case F54_TX_TO_TX_SHORT:
> + case F54_TX_OPEN:
> + case F54_TX_TO_GROUND:
> + size = (tx + 7) / 8;
> + break;
> + case F54_RX_TO_RX1:
> + case F54_RX_OPENS1:
> + if (rx < tx)
> + size = 2 * rx * rx;
> + else
> + size = 2 * rx * tx;
> + break;
> + case F54_RX_TO_RX2:
> + case F54_RX_OPENS2:
> + if (rx <= tx)
> + size = 0;
> + else
> + size = 2 * rx * (rx - tx);
> + break;
> + default:
> + size = 0;
> + }
> +
> + return size;
> +}
> +
> +static const struct v4l2_file_operations rmi_f54_video_fops = {
> + .owner = THIS_MODULE,
> + .open = v4l2_fh_open,
> + .release = vb2_fop_release,
> + .unlocked_ioctl = video_ioctl2,
> + .read = vb2_fop_read,
> + .mmap = vb2_fop_mmap,
> + .poll = vb2_fop_poll,
> +};
> +
> +static int rmi_f54_queue_setup(struct vb2_queue *q,
> + unsigned int *nbuffers, unsigned int *nplanes,
> + unsigned int sizes[], void *alloc_ctxs[])
> +{
> + struct f54_data *f54 = q->drv_priv;
> +
> + if (*nplanes)
> + return sizes[0] < rmi_f54_get_report_size(f54) ? -EINVAL : 0;
> +
> + *nplanes = 1;
> + sizes[0] = rmi_f54_get_report_size(f54);
> +
> + return 0;
> +}
> +
> +static void rmi_f54_buffer_queue(struct vb2_buffer *vb)
> +{
> + struct f54_data *f54 = vb2_get_drv_priv(vb->vb2_queue);
> + u16 *ptr;
> + enum vb2_buffer_state state;
> + enum f54_report_type reptype;
> + int ret;
> +
> + mutex_lock(&f54->status_mutex);
> +
> + reptype = rmi_f54_get_reptype(f54, f54->input);
> + if (reptype == F54_REPORT_NONE) {
> + state = VB2_BUF_STATE_ERROR;
> + goto done;
> + }
> +
> + if (f54->is_busy) {
> + state = VB2_BUF_STATE_ERROR;
> + goto done;
> + }
> +
> + ret = rmi_f54_request_report(f54->fn, reptype);
> + if (ret) {
> + dev_err(&f54->fn->dev, "Error requesting F54 report\n");
> + state = VB2_BUF_STATE_ERROR;
> + goto done;
> + }
> +
> + /* get frame data */
> + mutex_lock(&f54->data_mutex);
> +
> + while (f54->is_busy) {
> + mutex_unlock(&f54->data_mutex);
> + if (!wait_for_completion_timeout(&f54->cmd_done,
> + msecs_to_jiffies(1000))) {
> + dev_err(&f54->fn->dev, "Timed out\n");
> + state = VB2_BUF_STATE_ERROR;
> + goto done;
> + }
> + mutex_lock(&f54->data_mutex);
> + }
> +
> + ptr = vb2_plane_vaddr(vb, 0);
> + if (!ptr) {
> + dev_err(&f54->fn->dev, "Error acquiring frame ptr\n");
> + state = VB2_BUF_STATE_ERROR;
> + goto data_done;
> + }
> +
> + memcpy(ptr, f54->report_data, f54->report_size);
> + vb2_set_plane_payload(vb, 0, rmi_f54_get_report_size(f54));
> + state = VB2_BUF_STATE_DONE;
> +
> +data_done:
> + mutex_unlock(&f54->data_mutex);
> +done:
> + vb2_buffer_done(vb, state);
> + mutex_unlock(&f54->status_mutex);
> +}
> +
> +/* V4L2 structures */
> +static const struct vb2_ops rmi_f54_queue_ops = {
> + .queue_setup = rmi_f54_queue_setup,
> + .buf_queue = rmi_f54_buffer_queue,
> + .wait_prepare = vb2_ops_wait_prepare,
> + .wait_finish = vb2_ops_wait_finish,
> +};
> +
> +static const struct vb2_queue rmi_f54_queue = {
> + .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
> + .io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF | VB2_READ,
> + .buf_struct_size = sizeof(struct vb2_buffer),
> + .ops = &rmi_f54_queue_ops,
> + .mem_ops = &vb2_vmalloc_memops,
> + .timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC,
> + .min_buffers_needed = 1,
> +};
> +
> +static int rmi_f54_vidioc_querycap(struct file *file, void *priv,
> + struct v4l2_capability *cap)
> +{
> + struct f54_data *f54 = video_drvdata(file);
> +
> + strlcpy(cap->driver, F54_NAME, sizeof(cap->driver));
> + strlcpy(cap->card, SYNAPTICS_INPUT_DEVICE_NAME, sizeof(cap->card));
> + strlcpy(cap->bus_info, dev_name(&f54->fn->dev), sizeof(cap->bus_info));
> +
> + return 0;
> +}
> +
> +static const char *rmi_f54_reptype_str(enum f54_report_type reptype)
> +{
> + switch (reptype) {
> + default:
> + case F54_REPORT_NONE: return "No report";
> + case F54_8BIT_IMAGE: return "8 bit image";
> + case F54_16BIT_IMAGE: return "16 bit image";
> + case F54_RAW_16BIT_IMAGE: return "Raw 16 bit image";
> + case F54_HIGH_RESISTANCE: return "High resistance";
> + case F54_TX_TO_TX_SHORT: return "TX to TX short";
> + case F54_RX_TO_RX1: return "RX to RX1";
> + case F54_TRUE_BASELINE: return "True baseline";
> + case F54_FULL_RAW_CAP_MIN_MAX: return "Full raw cap min max";
> + case F54_RX_OPENS1: return "RX open S1";
> + case F54_TX_OPEN: return "TX open";
> + case F54_TX_TO_GROUND: return "TX to ground";
> + case F54_RX_TO_RX2: return "RX to RX2";
> + case F54_RX_OPENS2: return "RX Open S2";
> + case F54_FULL_RAW_CAP: return "Full raw cap";
> + case F54_FULL_RAW_CAP_RX_COUPLING_COMP:
> + return "Full raw cap RX coupling comp";
> + case F54_MAX_REPORT_TYPE: return "Max report type";
> + }
> +}
> +
> +static int rmi_f54_vidioc_enum_input(struct file *file, void *priv,
> + struct v4l2_input *i)
> +{
> + struct f54_data *f54 = video_drvdata(file);
> + enum f54_report_type reptype;
> +
> + reptype = rmi_f54_get_reptype(f54, i->index);
> + if (reptype == F54_REPORT_NONE)
> + return -EINVAL;
> +
> + i->type = V4L2_INPUT_TYPE_TOUCH_SENSOR;
> + strlcpy(i->name, rmi_f54_reptype_str(reptype), sizeof(i->name));
Hmm, this doesn't feel right, but I don't have enough knowledge to decide if
using inputs for this is the right approach.
One thing that strikes me as odd is that both F54_8BIT_IMAGE and F54_16BIT_IMAGE
both seem to return signed 16 bit samples. I would expect this to result in
different pixel formats.
I have no idea what all these inputs mean. Are they all actually needed?
Would this perhaps be better implemented through a menu control?
I generally go by the philosophy that if I can't understand it, then it is
likely that others won't either :-)
Regards,
Hans
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