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linux/drivers/input/rmi4/rmi_f03.c

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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2015-2016 Red Hat
* Copyright (C) 2015 Lyude Paul <thatslyude@gmail.com>
*/
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/serio.h>
#include <linux/notifier.h>
#include "rmi_driver.h"
#define RMI_F03_RX_DATA_OFB 0x01
#define RMI_F03_OB_SIZE 2
#define RMI_F03_OB_OFFSET 2
#define RMI_F03_OB_DATA_OFFSET 1
#define RMI_F03_OB_FLAG_TIMEOUT BIT(6)
#define RMI_F03_OB_FLAG_PARITY BIT(7)
#define RMI_F03_DEVICE_COUNT 0x07
#define RMI_F03_BYTES_PER_DEVICE 0x07
#define RMI_F03_BYTES_PER_DEVICE_SHIFT 4
#define RMI_F03_QUEUE_LENGTH 0x0F
#define PSMOUSE_OOB_EXTRA_BTNS 0x01
struct f03_data {
struct rmi_function *fn;
struct serio *serio;
bool serio_registered;
unsigned int overwrite_buttons;
u8 device_count;
u8 rx_queue_length;
};
int rmi_f03_overwrite_button(struct rmi_function *fn, unsigned int button,
int value)
{
struct f03_data *f03 = dev_get_drvdata(&fn->dev);
unsigned int bit;
if (button < BTN_LEFT || button > BTN_MIDDLE)
return -EINVAL;
bit = BIT(button - BTN_LEFT);
if (value)
f03->overwrite_buttons |= bit;
else
f03->overwrite_buttons &= ~bit;
return 0;
}
void rmi_f03_commit_buttons(struct rmi_function *fn)
{
struct f03_data *f03 = dev_get_drvdata(&fn->dev);
struct serio *serio = f03->serio;
serio_pause_rx(serio);
if (serio->drv) {
serio->drv->interrupt(serio, PSMOUSE_OOB_EXTRA_BTNS,
SERIO_OOB_DATA);
serio->drv->interrupt(serio, f03->overwrite_buttons,
SERIO_OOB_DATA);
}
serio_continue_rx(serio);
}
static int rmi_f03_pt_write(struct serio *id, unsigned char val)
{
struct f03_data *f03 = id->port_data;
int error;
rmi_dbg(RMI_DEBUG_FN, &f03->fn->dev,
"%s: Wrote %.2hhx to PS/2 passthrough address",
__func__, val);
error = rmi_write(f03->fn->rmi_dev, f03->fn->fd.data_base_addr, val);
if (error) {
dev_err(&f03->fn->dev,
"%s: Failed to write to F03 TX register (%d).\n",
__func__, error);
return error;
}
return 0;
}
static int rmi_f03_initialize(struct f03_data *f03)
{
struct rmi_function *fn = f03->fn;
struct device *dev = &fn->dev;
int error;
u8 bytes_per_device;
u8 query1;
u8 query2[RMI_F03_DEVICE_COUNT * RMI_F03_BYTES_PER_DEVICE];
size_t query2_len;
error = rmi_read(fn->rmi_dev, fn->fd.query_base_addr, &query1);
if (error) {
dev_err(dev, "Failed to read query register (%d).\n", error);
return error;
}
f03->device_count = query1 & RMI_F03_DEVICE_COUNT;
bytes_per_device = (query1 >> RMI_F03_BYTES_PER_DEVICE_SHIFT) &
RMI_F03_BYTES_PER_DEVICE;
query2_len = f03->device_count * bytes_per_device;
/*
* The first generation of image sensors don't have a second part to
* their f03 query, as such we have to set some of these values manually
*/
if (query2_len < 1) {
f03->device_count = 1;
f03->rx_queue_length = 7;
} else {
error = rmi_read_block(fn->rmi_dev, fn->fd.query_base_addr + 1,
query2, query2_len);
if (error) {
dev_err(dev,
"Failed to read second set of query registers (%d).\n",
error);
return error;
}
f03->rx_queue_length = query2[0] & RMI_F03_QUEUE_LENGTH;
}
return 0;
}
static int rmi_f03_pt_open(struct serio *serio)
{
struct f03_data *f03 = serio->port_data;
struct rmi_function *fn = f03->fn;
const u8 ob_len = f03->rx_queue_length * RMI_F03_OB_SIZE;
const u16 data_addr = fn->fd.data_base_addr + RMI_F03_OB_OFFSET;
u8 obs[RMI_F03_QUEUE_LENGTH * RMI_F03_OB_SIZE];
int error;
/*
* Consume any pending data. Some devices like to spam with
* 0xaa 0x00 announcements which may confuse us as we try to
* probe the device.
*/
error = rmi_read_block(fn->rmi_dev, data_addr, &obs, ob_len);
if (!error)
rmi_dbg(RMI_DEBUG_FN, &fn->dev,
"%s: Consumed %*ph (%d) from PS2 guest\n",
__func__, ob_len, obs, ob_len);
return fn->rmi_dev->driver->set_irq_bits(fn->rmi_dev, fn->irq_mask);
}
static void rmi_f03_pt_close(struct serio *serio)
{
struct f03_data *f03 = serio->port_data;
struct rmi_function *fn = f03->fn;
fn->rmi_dev->driver->clear_irq_bits(fn->rmi_dev, fn->irq_mask);
}
static int rmi_f03_register_pt(struct f03_data *f03)
{
struct serio *serio;
serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
if (!serio)
return -ENOMEM;
serio->id.type = SERIO_PS_PSTHRU;
serio->write = rmi_f03_pt_write;
serio->open = rmi_f03_pt_open;
serio->close = rmi_f03_pt_close;
serio->port_data = f03;
strscpy(serio->name, "RMI4 PS/2 pass-through", sizeof(serio->name));
snprintf(serio->phys, sizeof(serio->phys), "%s/serio0",
dev_name(&f03->fn->dev));
serio->dev.parent = &f03->fn->dev;
f03->serio = serio;
printk(KERN_INFO "serio: %s port at %s\n",
serio->name, dev_name(&f03->fn->dev));
serio_register_port(serio);
return 0;
}
static int rmi_f03_probe(struct rmi_function *fn)
{
struct device *dev = &fn->dev;
struct f03_data *f03;
int error;
f03 = devm_kzalloc(dev, sizeof(struct f03_data), GFP_KERNEL);
if (!f03)
return -ENOMEM;
f03->fn = fn;
error = rmi_f03_initialize(f03);
if (error < 0)
return error;
if (f03->device_count != 1)
dev_warn(dev, "found %d devices on PS/2 passthrough",
f03->device_count);
dev_set_drvdata(dev, f03);
return 0;
}
static int rmi_f03_config(struct rmi_function *fn)
{
struct f03_data *f03 = dev_get_drvdata(&fn->dev);
int error;
if (!f03->serio_registered) {
error = rmi_f03_register_pt(f03);
if (error)
return error;
f03->serio_registered = true;
} else {
/*
* We must be re-configuring the sensor, just enable
* interrupts for this function.
*/
fn->rmi_dev->driver->set_irq_bits(fn->rmi_dev, fn->irq_mask);
}
return 0;
}
static irqreturn_t rmi_f03_attention(int irq, void *ctx)
{
struct rmi_function *fn = ctx;
struct rmi_device *rmi_dev = fn->rmi_dev;
struct rmi_driver_data *drvdata = dev_get_drvdata(&rmi_dev->dev);
struct f03_data *f03 = dev_get_drvdata(&fn->dev);
const u16 data_addr = fn->fd.data_base_addr + RMI_F03_OB_OFFSET;
const u8 ob_len = f03->rx_queue_length * RMI_F03_OB_SIZE;
u8 obs[RMI_F03_QUEUE_LENGTH * RMI_F03_OB_SIZE];
u8 ob_status;
u8 ob_data;
unsigned int serio_flags;
int i;
int error;
if (drvdata->attn_data.data) {
/* First grab the data passed by the transport device */
if (drvdata->attn_data.size < ob_len) {
dev_warn(&fn->dev, "F03 interrupted, but data is missing!\n");
return IRQ_HANDLED;
}
memcpy(obs, drvdata->attn_data.data, ob_len);
drvdata->attn_data.data += ob_len;
drvdata->attn_data.size -= ob_len;
} else {
/* Grab all of the data registers, and check them for data */
error = rmi_read_block(fn->rmi_dev, data_addr, &obs, ob_len);
if (error) {
dev_err(&fn->dev,
"%s: Failed to read F03 output buffers: %d\n",
__func__, error);
serio_interrupt(f03->serio, 0, SERIO_TIMEOUT);
return IRQ_RETVAL(error);
}
}
for (i = 0; i < ob_len; i += RMI_F03_OB_SIZE) {
ob_status = obs[i];
ob_data = obs[i + RMI_F03_OB_DATA_OFFSET];
serio_flags = 0;
if (!(ob_status & RMI_F03_RX_DATA_OFB))
continue;
if (ob_status & RMI_F03_OB_FLAG_TIMEOUT)
serio_flags |= SERIO_TIMEOUT;
if (ob_status & RMI_F03_OB_FLAG_PARITY)
serio_flags |= SERIO_PARITY;
rmi_dbg(RMI_DEBUG_FN, &fn->dev,
"%s: Received %.2hhx from PS2 guest T: %c P: %c\n",
__func__, ob_data,
serio_flags & SERIO_TIMEOUT ? 'Y' : 'N',
serio_flags & SERIO_PARITY ? 'Y' : 'N');
serio_interrupt(f03->serio, ob_data, serio_flags);
}
return IRQ_HANDLED;
}
static void rmi_f03_remove(struct rmi_function *fn)
{
struct f03_data *f03 = dev_get_drvdata(&fn->dev);
if (f03->serio_registered)
serio_unregister_port(f03->serio);
}
struct rmi_function_handler rmi_f03_handler = {
.driver = {
.name = "rmi4_f03",
},
.func = 0x03,
.probe = rmi_f03_probe,
.config = rmi_f03_config,
.attention = rmi_f03_attention,
.remove = rmi_f03_remove,
};
MODULE_AUTHOR("Lyude Paul <thatslyude@gmail.com>");
MODULE_DESCRIPTION("RMI F03 module");
MODULE_LICENSE("GPL");