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linux/drivers/input/serio/ps2-gpio.c
Danilo Krummrich 9ee0a05588 Input: PS/2 gpio bit banging driver for serio bus 
This driver provides PS/2 serio bus support by implementing bit banging
with the GPIO API. The GPIO pins, data and clock, can be configured with
a node in the device tree or by generic device properties (GDP).

Writing to a device is supported as well, though it is possible timings
can not be halt as they are tough and difficult to reach with bit banging.
Therefore it can be configured (also in DT and GDP) whether the serio
write function should be available for clients.

This driver is for development purposes and not recommended for productive
use. However, this driver can be useful e.g. when no USB port is available
or using old peripherals is desired as PS/2 controller chips getting rare.

This driver was tested on bcm2825 and on Kirin 960 and it worked well
together with the atkbd and psmouse driver.

Signed-off-by: Danilo Krummrich <danilokrummrich@dk-develop.de>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
2017-08-28 10:32:10 -07:00

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/*
* GPIO based serio bus driver for bit banging the PS/2 protocol
*
* Author: Danilo Krummrich <danilokrummrich@dk-develop.de>
*
* 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/gpio/consumer.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/serio.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/workqueue.h>
#include <linux/completion.h>
#include <linux/mutex.h>
#include <linux/preempt.h>
#include <linux/property.h>
#include <linux/of.h>
#include <linux/jiffies.h>
#include <linux/delay.h>
#define DRIVER_NAME "ps2-gpio"
#define PS2_MODE_RX 0
#define PS2_MODE_TX 1
#define PS2_START_BIT 0
#define PS2_DATA_BIT0 1
#define PS2_DATA_BIT1 2
#define PS2_DATA_BIT2 3
#define PS2_DATA_BIT3 4
#define PS2_DATA_BIT4 5
#define PS2_DATA_BIT5 6
#define PS2_DATA_BIT6 7
#define PS2_DATA_BIT7 8
#define PS2_PARITY_BIT 9
#define PS2_STOP_BIT 10
#define PS2_TX_TIMEOUT 11
#define PS2_ACK_BIT 12
#define PS2_DEV_RET_ACK 0xfa
#define PS2_DEV_RET_NACK 0xfe
#define PS2_CMD_RESEND 0xfe
struct ps2_gpio_data {
struct device *dev;
struct serio *serio;
unsigned char mode;
struct gpio_desc *gpio_clk;
struct gpio_desc *gpio_data;
bool write_enable;
int irq;
unsigned char rx_cnt;
unsigned char rx_byte;
unsigned char tx_cnt;
unsigned char tx_byte;
struct completion tx_done;
struct mutex tx_mutex;
struct delayed_work tx_work;
};
static int ps2_gpio_open(struct serio *serio)
{
struct ps2_gpio_data *drvdata = serio->port_data;
enable_irq(drvdata->irq);
return 0;
}
static void ps2_gpio_close(struct serio *serio)
{
struct ps2_gpio_data *drvdata = serio->port_data;
disable_irq(drvdata->irq);
}
static int __ps2_gpio_write(struct serio *serio, unsigned char val)
{
struct ps2_gpio_data *drvdata = serio->port_data;
disable_irq_nosync(drvdata->irq);
gpiod_direction_output(drvdata->gpio_clk, 0);
drvdata->mode = PS2_MODE_TX;
drvdata->tx_byte = val;
schedule_delayed_work(&drvdata->tx_work, usecs_to_jiffies(200));
return 0;
}
static int ps2_gpio_write(struct serio *serio, unsigned char val)
{
struct ps2_gpio_data *drvdata = serio->port_data;
int ret = 0;
if (in_task()) {
mutex_lock(&drvdata->tx_mutex);
__ps2_gpio_write(serio, val);
if (!wait_for_completion_timeout(&drvdata->tx_done,
msecs_to_jiffies(10000)))
ret = SERIO_TIMEOUT;
mutex_unlock(&drvdata->tx_mutex);
} else {
__ps2_gpio_write(serio, val);
}
return ret;
}
static void ps2_gpio_tx_work_fn(struct work_struct *work)
{
struct delayed_work *dwork = to_delayed_work(work);
struct ps2_gpio_data *drvdata = container_of(dwork,
struct ps2_gpio_data,
tx_work);
enable_irq(drvdata->irq);
gpiod_direction_output(drvdata->gpio_data, 0);
gpiod_direction_input(drvdata->gpio_clk);
}
static irqreturn_t ps2_gpio_irq_rx(struct ps2_gpio_data *drvdata)
{
unsigned char byte, cnt;
int data;
int rxflags = 0;
static unsigned long old_jiffies;
byte = drvdata->rx_byte;
cnt = drvdata->rx_cnt;
if (old_jiffies == 0)
old_jiffies = jiffies;
if ((jiffies - old_jiffies) > usecs_to_jiffies(100)) {
dev_err(drvdata->dev,
"RX: timeout, probably we missed an interrupt\n");
goto err;
}
old_jiffies = jiffies;
data = gpiod_get_value(drvdata->gpio_data);
if (unlikely(data < 0)) {
dev_err(drvdata->dev, "RX: failed to get data gpio val: %d\n",
data);
goto err;
}
switch (cnt) {
case PS2_START_BIT:
/* start bit should be low */
if (unlikely(data)) {
dev_err(drvdata->dev, "RX: start bit should be low\n");
goto err;
}
break;
case PS2_DATA_BIT0:
case PS2_DATA_BIT1:
case PS2_DATA_BIT2:
case PS2_DATA_BIT3:
case PS2_DATA_BIT4:
case PS2_DATA_BIT5:
case PS2_DATA_BIT6:
case PS2_DATA_BIT7:
/* processing data bits */
if (data)
byte |= (data << (cnt - 1));
break;
case PS2_PARITY_BIT:
/* check odd parity */
if (!((hweight8(byte) & 1) ^ data)) {
rxflags |= SERIO_PARITY;
dev_warn(drvdata->dev, "RX: parity error\n");
if (!drvdata->write_enable)
goto err;
}
/* Do not send spurious ACK's and NACK's when write fn is
* not provided.
*/
if (!drvdata->write_enable) {
if (byte == PS2_DEV_RET_NACK)
goto err;
else if (byte == PS2_DEV_RET_ACK)
break;
}
/* Let's send the data without waiting for the stop bit to be
* sent. It may happen that we miss the stop bit. When this
* happens we have no way to recover from this, certainly
* missing the parity bit would be recognized when processing
* the stop bit. When missing both, data is lost.
*/
serio_interrupt(drvdata->serio, byte, rxflags);
dev_dbg(drvdata->dev, "RX: sending byte 0x%x\n", byte);
break;
case PS2_STOP_BIT:
/* stop bit should be high */
if (unlikely(!data)) {
dev_err(drvdata->dev, "RX: stop bit should be high\n");
goto err;
}
cnt = byte = 0;
old_jiffies = 0;
goto end; /* success */
default:
dev_err(drvdata->dev, "RX: got out of sync with the device\n");
goto err;
}
cnt++;
goto end; /* success */
err:
cnt = byte = 0;
old_jiffies = 0;
__ps2_gpio_write(drvdata->serio, PS2_CMD_RESEND);
end:
drvdata->rx_cnt = cnt;
drvdata->rx_byte = byte;
return IRQ_HANDLED;
}
static irqreturn_t ps2_gpio_irq_tx(struct ps2_gpio_data *drvdata)
{
unsigned char byte, cnt;
int data;
static unsigned long old_jiffies;
cnt = drvdata->tx_cnt;
byte = drvdata->tx_byte;
if (old_jiffies == 0)
old_jiffies = jiffies;
if ((jiffies - old_jiffies) > usecs_to_jiffies(100)) {
dev_err(drvdata->dev,
"TX: timeout, probably we missed an interrupt\n");
goto err;
}
old_jiffies = jiffies;
switch (cnt) {
case PS2_START_BIT:
/* should never happen */
dev_err(drvdata->dev,
"TX: start bit should have been sent already\n");
goto err;
case PS2_DATA_BIT0:
case PS2_DATA_BIT1:
case PS2_DATA_BIT2:
case PS2_DATA_BIT3:
case PS2_DATA_BIT4:
case PS2_DATA_BIT5:
case PS2_DATA_BIT6:
case PS2_DATA_BIT7:
data = byte & BIT(cnt - 1);
gpiod_set_value(drvdata->gpio_data, data);
break;
case PS2_PARITY_BIT:
/* do odd parity */
data = !(hweight8(byte) & 1);
gpiod_set_value(drvdata->gpio_data, data);
break;
case PS2_STOP_BIT:
/* release data line to generate stop bit */
gpiod_direction_input(drvdata->gpio_data);
break;
case PS2_TX_TIMEOUT:
/* Devices generate one extra clock pulse before sending the
* acknowledgment.
*/
break;
case PS2_ACK_BIT:
gpiod_direction_input(drvdata->gpio_data);
data = gpiod_get_value(drvdata->gpio_data);
if (data) {
dev_warn(drvdata->dev, "TX: received NACK, retry\n");
goto err;
}
drvdata->mode = PS2_MODE_RX;
complete(&drvdata->tx_done);
cnt = 1;
old_jiffies = 0;
goto end; /* success */
default:
/* Probably we missed the stop bit. Therefore we release data
* line and try again.
*/
gpiod_direction_input(drvdata->gpio_data);
dev_err(drvdata->dev, "TX: got out of sync with the device\n");
goto err;
}
cnt++;
goto end; /* success */
err:
cnt = 1;
old_jiffies = 0;
gpiod_direction_input(drvdata->gpio_data);
__ps2_gpio_write(drvdata->serio, drvdata->tx_byte);
end:
drvdata->tx_cnt = cnt;
return IRQ_HANDLED;
}
static irqreturn_t ps2_gpio_irq(int irq, void *dev_id)
{
struct ps2_gpio_data *drvdata = dev_id;
return drvdata->mode ? ps2_gpio_irq_tx(drvdata) :
ps2_gpio_irq_rx(drvdata);
}
static int ps2_gpio_get_props(struct device *dev,
struct ps2_gpio_data *drvdata)
{
drvdata->gpio_data = devm_gpiod_get(dev, "data", GPIOD_IN);
if (IS_ERR(drvdata->gpio_data)) {
dev_err(dev, "failed to request data gpio: %ld",
PTR_ERR(drvdata->gpio_data));
return PTR_ERR(drvdata->gpio_data);
}
drvdata->gpio_clk = devm_gpiod_get(dev, "clk", GPIOD_IN);
if (IS_ERR(drvdata->gpio_clk)) {
dev_err(dev, "failed to request clock gpio: %ld",
PTR_ERR(drvdata->gpio_clk));
return PTR_ERR(drvdata->gpio_clk);
}
drvdata->write_enable = device_property_read_bool(dev,
"write-enable");
return 0;
}
static int ps2_gpio_probe(struct platform_device *pdev)
{
struct ps2_gpio_data *drvdata;
struct serio *serio;
struct device *dev = &pdev->dev;
int error;
drvdata = devm_kzalloc(dev, sizeof(struct ps2_gpio_data), GFP_KERNEL);
serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
if (!drvdata || !serio) {
error = -ENOMEM;
goto err_free_serio;
}
error = ps2_gpio_get_props(dev, drvdata);
if (error)
goto err_free_serio;
if (gpiod_cansleep(drvdata->gpio_data) ||
gpiod_cansleep(drvdata->gpio_clk)) {
dev_err(dev, "GPIO data or clk are connected via slow bus\n");
error = -EINVAL;
}
drvdata->irq = platform_get_irq(pdev, 0);
if (drvdata->irq < 0) {
dev_err(dev, "failed to get irq from platform resource: %d\n",
drvdata->irq);
error = drvdata->irq;
goto err_free_serio;
}
error = devm_request_irq(dev, drvdata->irq, ps2_gpio_irq,
IRQF_NO_THREAD, DRIVER_NAME, drvdata);
if (error) {
dev_err(dev, "failed to request irq %d: %d\n",
drvdata->irq, error);
goto err_free_serio;
}
/* Keep irq disabled until serio->open is called. */
disable_irq(drvdata->irq);
serio->id.type = SERIO_8042;
serio->open = ps2_gpio_open;
serio->close = ps2_gpio_close;
/* Write can be enabled in platform/dt data, but possibly it will not
* work because of the tough timings.
*/
serio->write = drvdata->write_enable ? ps2_gpio_write : NULL;
serio->port_data = drvdata;
serio->dev.parent = dev;
strlcpy(serio->name, dev_name(dev), sizeof(serio->name));
strlcpy(serio->phys, dev_name(dev), sizeof(serio->phys));
drvdata->serio = serio;
drvdata->dev = dev;
drvdata->mode = PS2_MODE_RX;
/* Tx count always starts at 1, as the start bit is sent implicitly by
* host-to-device communication initialization.
*/
drvdata->tx_cnt = 1;
INIT_DELAYED_WORK(&drvdata->tx_work, ps2_gpio_tx_work_fn);
init_completion(&drvdata->tx_done);
mutex_init(&drvdata->tx_mutex);
serio_register_port(serio);
platform_set_drvdata(pdev, drvdata);
return 0; /* success */
err_free_serio:
kfree(serio);
return error;
}
static int ps2_gpio_remove(struct platform_device *pdev)
{
struct ps2_gpio_data *drvdata = platform_get_drvdata(pdev);
serio_unregister_port(drvdata->serio);
return 0;
}
#if defined(CONFIG_OF)
static const struct of_device_id ps2_gpio_match[] = {
{ .compatible = "ps2-gpio", },
{ },
};
MODULE_DEVICE_TABLE(of, ps2_gpio_match);
#endif
static struct platform_driver ps2_gpio_driver = {
.probe = ps2_gpio_probe,
.remove = ps2_gpio_remove,
.driver = {
.name = DRIVER_NAME,
.of_match_table = of_match_ptr(ps2_gpio_match),
},
};
module_platform_driver(ps2_gpio_driver);
MODULE_AUTHOR("Danilo Krummrich <danilokrummrich@dk-develop.de>");
MODULE_DESCRIPTION("GPIO PS2 driver");
MODULE_LICENSE("GPL v2");
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