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/*
* 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
/* 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,
};
static const char * const 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 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)
{
struct rmi_device *rmi_dev = f54->fn->rmi_dev;
struct rmi_driver_data *drv_data = dev_get_drvdata(&rmi_dev->dev);
u8 rx = drv_data->num_rx_electrodes ? : f54->num_rx_electrodes;
u8 tx = drv_data->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
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