blob: d8e5205e89754d355d1f189bb95f3d584ac57aec [file] [log] [blame]
/*
* Copyright (c) 2012-2015 Synaptics Incorporated
* Copyright (C) 2016 Zodiac Inflight Innovations
*
* 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
/* F54 capabilities */
#define F54_CAP_BASELINE (1 << 2)
#define F54_CAP_IMAGE8 (1 << 3)
#define F54_CAP_IMAGE16 (1 << 6)
/**
* enum rmi_f54_report_type - RMI4 F54 report types
*
* @F54_8BIT_IMAGE: Normalized 8-Bit Image Report. The capacitance variance
* from baseline for each pixel.
*
* @F54_16BIT_IMAGE: Normalized 16-Bit Image Report. The capacitance variance
* from baseline for each pixel.
*
* @F54_RAW_16BIT_IMAGE:
* Raw 16-Bit Image Report. The raw capacitance for each
* pixel.
*
* @F54_TRUE_BASELINE: True Baseline Report. The baseline capacitance for each
* pixel.
*
* @F54_FULL_RAW_CAP: Full Raw Capacitance Report. The raw capacitance with
* low reference set to its minimum value and high
* reference set to its maximum value.
*
* @F54_FULL_RAW_CAP_RX_OFFSET_REMOVED:
* Full Raw Capacitance with Receiver Offset Removed
* Report. Set Low reference to its minimum value and high
* references to its maximum value, then report the raw
* capacitance for each pixel.
*/
enum rmi_f54_report_type {
F54_REPORT_NONE = 0,
F54_8BIT_IMAGE = 1,
F54_16BIT_IMAGE = 2,
F54_RAW_16BIT_IMAGE = 3,
F54_TRUE_BASELINE = 9,
F54_FULL_RAW_CAP = 19,
F54_FULL_RAW_CAP_RX_OFFSET_REMOVED = 20,
F54_MAX_REPORT_TYPE,
};
const char *rmi_f54_report_type_names[] = {
[F54_REPORT_NONE] = "Unknown",
[F54_8BIT_IMAGE] = "Normalized 8-Bit Image",
[F54_16BIT_IMAGE] = "Normalized 16-Bit Image",
[F54_RAW_16BIT_IMAGE] = "Raw 16-Bit Image",
[F54_TRUE_BASELINE] = "True Baseline",
[F54_FULL_RAW_CAP] = "Full Raw Capacitance",
[F54_FULL_RAW_CAP_RX_OFFSET_REMOVED]
= "Full Raw Capacitance RX Offset Removed",
};
struct rmi_f54_reports {
int start;
int size;
};
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 rmi_f54_report_type report_type;
u8 *report_data;
int report_size;
struct rmi_f54_reports standard_report[2];
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 rmi_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 rmi_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_FULL_RAW_CAP:
case F54_FULL_RAW_CAP_RX_OFFSET_REMOVED:
return true;
default:
return false;
}
}
static enum rmi_f54_report_type rmi_f54_get_reptype(struct f54_data *f54,
unsigned int i)
{
if (i >= F54_MAX_REPORT_TYPE)
return F54_REPORT_NONE;
return f54->inputs[i];
}
static void rmi_f54_create_input_map(struct f54_data *f54)
{
int i = 0;
enum rmi_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)
goto unlock;
init_completion(&f54->cmd_done);
f54->is_busy = 1;
f54->timeout = jiffies + msecs_to_jiffies(100);
queue_delayed_work(f54->workqueue, &f54->work, 0);
unlock:
mutex_unlock(&f54->data_mutex);
return error;
}
static size_t 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;
size_t 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_OFFSET_REMOVED:
size = sizeof(u16) * rx * tx;
break;
default:
size = 0;
}
return size;
}
static int rmi_f54_get_pixel_fmt(enum rmi_f54_report_type reptype, u32 *pixfmt)
{
int ret = 0;
switch (reptype) {
case F54_8BIT_IMAGE:
*pixfmt = V4L2_TCH_FMT_DELTA_TD08;
break;
case F54_16BIT_IMAGE:
*pixfmt = V4L2_TCH_FMT_DELTA_TD16;
break;
case F54_RAW_16BIT_IMAGE:
case F54_TRUE_BASELINE:
case F54_FULL_RAW_CAP:
case F54_FULL_RAW_CAP_RX_OFFSET_REMOVED:
*pixfmt = V4L2_TCH_FMT_TU16;
break;
case F54_REPORT_NONE:
case F54_MAX_REPORT_TYPE:
ret = -EINVAL;
break;
}
return ret;
}
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[],
struct device *alloc_devs[])
{
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 rmi_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_v4l2_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));
snprintf(cap->bus_info, sizeof(cap->bus_info),
"rmi4:%s", dev_name(&f54->fn->dev));
return 0;
}
static int rmi_f54_vidioc_enum_input(struct file *file, void *priv,
struct v4l2_input *i)
{
struct f54_data *f54 = video_drvdata(file);
enum rmi_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;
strlcpy(i->name, rmi_f54_report_type_names[reptype], sizeof(i->name));
return 0;
}
static int rmi_f54_set_input(struct f54_data *f54, unsigned int i)
{
struct v4l2_pix_format *f = &f54->format;
enum rmi_f54_report_type reptype;
int ret;
reptype = rmi_f54_get_reptype(f54, i);
if (reptype == F54_REPORT_NONE)
return -EINVAL;
ret = rmi_f54_get_pixel_fmt(reptype, &f->pixelformat);
if (ret)
return ret;
f54->input = i;
f->width = f54->num_rx_electrodes;
f->height = f54->num_tx_electrodes;
f->field = V4L2_FIELD_NONE;
f->colorspace = V4L2_COLORSPACE_RAW;
f->bytesperline = f->width * sizeof(u16);
f->sizeimage = f->width * f->height * sizeof(u16);
return 0;
}
static int rmi_f54_vidioc_s_input(struct file *file, void *priv, unsigned int i)
{
return rmi_f54_set_input(video_drvdata(file), i);
}
static int rmi_f54_vidioc_g_input(struct file *file, void *priv,
unsigned int *i)
{
struct f54_data *f54 = video_drvdata(file);
*i = f54->input;
return 0;
}
static int rmi_f54_vidioc_fmt(struct file *file, void *priv,
struct v4l2_format *f)
{
struct f54_data *f54 = video_drvdata(file);
f->fmt.pix = f54->format;
return 0;
}
static int rmi_f54_vidioc_enum_fmt(struct file *file, void *priv,
struct v4l2_fmtdesc *fmt)
{
if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
return -EINVAL;
switch (fmt->index) {
case 0:
fmt->pixelformat = V4L2_TCH_FMT_DELTA_TD16;
break;
case 1:
fmt->pixelformat = V4L2_TCH_FMT_DELTA_TD08;
break;
case 2:
fmt->pixelformat = V4L2_TCH_FMT_TU16;
break;
default:
return -EINVAL;
}
return 0;
}
static int rmi_f54_vidioc_g_parm(struct file *file, void *fh,
struct v4l2_streamparm *a)
{
if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
return -EINVAL;
a->parm.capture.readbuffers = 1;
a->parm.capture.timeperframe.numerator = 1;
a->parm.capture.timeperframe.denominator = 10;
return 0;
}
static const struct v4l2_ioctl_ops rmi_f54_video_ioctl_ops = {
.vidioc_querycap = rmi_f54_vidioc_querycap,
.vidioc_enum_fmt_vid_cap = rmi_f54_vidioc_enum_fmt,
.vidioc_s_fmt_vid_cap = rmi_f54_vidioc_fmt,
.vidioc_g_fmt_vid_cap = rmi_f54_vidioc_fmt,
.vidioc_try_fmt_vid_cap = rmi_f54_vidioc_fmt,
.vidioc_g_parm = rmi_f54_vidioc_g_parm,
.vidioc_enum_input = rmi_f54_vidioc_enum_input,
.vidioc_g_input = rmi_f54_vidioc_g_input,
.vidioc_s_input = rmi_f54_vidioc_s_input,
.vidioc_reqbufs = vb2_ioctl_reqbufs,
.vidioc_create_bufs = vb2_ioctl_create_bufs,
.vidioc_querybuf = vb2_ioctl_querybuf,
.vidioc_qbuf = vb2_ioctl_qbuf,
.vidioc_dqbuf = vb2_ioctl_dqbuf,
.vidioc_expbuf = vb2_ioctl_expbuf,
.vidioc_streamon = vb2_ioctl_streamon,
.vidioc_streamoff = vb2_ioctl_streamoff,
};
static const struct video_device rmi_f54_video_device = {
.name = "Synaptics RMI4",
.fops = &rmi_f54_video_fops,
.ioctl_ops = &rmi_f54_video_ioctl_ops,
.release = video_device_release_empty,
.device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_TOUCH |
V4L2_CAP_READWRITE | V4L2_CAP_STREAMING,
};
static void rmi_f54_work(struct work_struct *work)
{
struct f54_data *f54 = container_of(work, struct f54_data, work.work);
struct rmi_function *fn = f54->fn;
u8 fifo[2];
struct rmi_f54_reports *report;
int report_size;
u8 command;
u8 *data;
int error;
data = f54->report_data;
report_size = rmi_f54_get_report_size(f54);
if (report_size == 0) {
dev_err(&fn->dev, "Bad report size, report type=%d\n",
f54->report_type);
error = -EINVAL;
goto error; /* retry won't help */
}
f54->standard_report[0].size = report_size;
report = f54->standard_report;
mutex_lock(&f54->data_mutex);
/*
* Need to check if command has completed.
* If not try again later.
*/
error = rmi_read(fn->rmi_dev, f54->fn->fd.command_base_addr,
&command);
if (error) {
dev_err(&fn->dev, "Failed to read back command\n");
goto error;
}
if (command & F54_GET_REPORT) {
if (time_after(jiffies, f54->timeout)) {
dev_err(&fn->dev, "Get report command timed out\n");
error = -ETIMEDOUT;
}
report_size = 0;
goto error;
}
rmi_dbg(RMI_DEBUG_FN, &fn->dev, "Get report command completed, reading data\n");
report_size = 0;
for (; report->size; report++) {
fifo[0] = report->start & 0xff;
fifo[1] = (report->start >> 8) & 0xff;
error = rmi_write_block(fn->rmi_dev,
fn->fd.data_base_addr + F54_FIFO_OFFSET,
fifo, sizeof(fifo));
if (error) {
dev_err(&fn->dev, "Failed to set fifo start offset\n");
goto abort;
}
error = rmi_read_block(fn->rmi_dev, fn->fd.data_base_addr +
F54_REPORT_DATA_OFFSET, data,
report->size);
if (error) {
dev_err(&fn->dev, "%s: read [%d bytes] returned %d\n",
__func__, report->size, error);
goto abort;
}
data += report->size;
report_size += report->size;
}
abort:
f54->report_size = error ? 0 : report_size;
error:
if (error)
report_size = 0;
if (report_size == 0 && !error) {
queue_delayed_work(f54->workqueue, &f54->work,
msecs_to_jiffies(1));
} else {
f54->is_busy = false;
complete(&f54->cmd_done);
}
mutex_unlock(&f54->data_mutex);
}
static int rmi_f54_attention(struct rmi_function *fn, unsigned long *irqbits)
{
return 0;
}
static int rmi_f54_config(struct rmi_function *fn)
{
struct rmi_driver *drv = fn->rmi_dev->driver;
drv->set_irq_bits(fn->rmi_dev, fn->irq_mask);
return 0;
}
static int rmi_f54_detect(struct rmi_function *fn)
{
int error;
struct f54_data *f54;
f54 = dev_get_drvdata(&fn->dev);
error = rmi_read_block(fn->rmi_dev, fn->fd.query_base_addr,
&f54->qry, sizeof(f54->qry));
if (error) {
dev_err(&fn->dev, "%s: Failed to query F54 properties\n",
__func__);
return error;
}
f54->num_rx_electrodes = f54->qry[0];
f54->num_tx_electrodes = f54->qry[1];
f54->capabilities = f54->qry[2];
f54->clock_rate = f54->qry[3] | (f54->qry[4] << 8);
f54->family = f54->qry[5];
rmi_dbg(RMI_DEBUG_FN, &fn->dev, "F54 num_rx_electrodes: %d\n",
f54->num_rx_electrodes);
rmi_dbg(RMI_DEBUG_FN, &fn->dev, "F54 num_tx_electrodes: %d\n",
f54->num_tx_electrodes);
rmi_dbg(RMI_DEBUG_FN, &fn->dev, "F54 capabilities: 0x%x\n",
f54->capabilities);
rmi_dbg(RMI_DEBUG_FN, &fn->dev, "F54 clock rate: 0x%x\n",
f54->clock_rate);
rmi_dbg(RMI_DEBUG_FN, &fn->dev, "F54 family: 0x%x\n",
f54->family);
f54->is_busy = false;
return 0;
}
static int rmi_f54_probe(struct rmi_function *fn)
{
struct f54_data *f54;
int ret;
u8 rx, tx;
f54 = devm_kzalloc(&fn->dev, sizeof(struct f54_data), GFP_KERNEL);
if (!f54)
return -ENOMEM;
f54->fn = fn;
dev_set_drvdata(&fn->dev, f54);
ret = rmi_f54_detect(fn);
if (ret)
return ret;
mutex_init(&f54->data_mutex);
mutex_init(&f54->status_mutex);
rx = f54->num_rx_electrodes;
tx = f54->num_tx_electrodes;
f54->report_data = devm_kzalloc(&fn->dev,
sizeof(u16) * tx * rx,
GFP_KERNEL);
if (f54->report_data == NULL)
return -ENOMEM;
INIT_DELAYED_WORK(&f54->work, rmi_f54_work);
f54->workqueue = create_singlethread_workqueue("rmi4-poller");
if (!f54->workqueue)
return -ENOMEM;
rmi_f54_create_input_map(f54);
/* register video device */
strlcpy(f54->v4l2.name, F54_NAME, sizeof(f54->v4l2.name));
ret = v4l2_device_register(&fn->dev, &f54->v4l2);
if (ret) {
dev_err(&fn->dev, "Unable to register video dev.\n");
goto remove_wq;
}
/* initialize the queue */
mutex_init(&f54->lock);
f54->queue = rmi_f54_queue;
f54->queue.drv_priv = f54;
f54->queue.lock = &f54->lock;
f54->queue.dev = &fn->dev;
ret = vb2_queue_init(&f54->queue);
if (ret)
goto remove_v4l2;
f54->vdev = rmi_f54_video_device;
f54->vdev.v4l2_dev = &f54->v4l2;
f54->vdev.lock = &f54->lock;
f54->vdev.vfl_dir = VFL_DIR_RX;
f54->vdev.queue = &f54->queue;
video_set_drvdata(&f54->vdev, f54);
ret = video_register_device(&f54->vdev, VFL_TYPE_TOUCH, -1);
if (ret) {
dev_err(&fn->dev, "Unable to register video subdevice.");
goto remove_v4l2;
}
return 0;
remove_v4l2:
v4l2_device_unregister(&f54->v4l2);
remove_wq:
cancel_delayed_work_sync(&f54->work);
flush_workqueue(f54->workqueue);
destroy_workqueue(f54->workqueue);
return ret;
}
static void rmi_f54_remove(struct rmi_function *fn)
{
struct f54_data *f54 = dev_get_drvdata(&fn->dev);
video_unregister_device(&f54->vdev);
v4l2_device_unregister(&f54->v4l2);
}
struct rmi_function_handler rmi_f54_handler = {
.driver = {
.name = F54_NAME,
},
.func = 0x54,
.probe = rmi_f54_probe,
.config = rmi_f54_config,
.attention = rmi_f54_attention,
.remove = rmi_f54_remove,
};