linux/drivers/input/rmi4/rmi_f3a.c
Vincent Huang 9e4c596bfd Input: synaptics-rmi4 - add support for F3A
RMI4 F3A supports the touchpad GPIO function, it's designed to
support more GPIOs and used on newer touchpads. This patch adds
support of the touchpad buttons.

Signed-off-by: Vincent Huang <vincent.huang@tw.synaptics.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Tested-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Andrew Duggan <aduggan@synaptics.com>
Link: https://lore.kernel.org/r/20200930094147.635556-3-vincent.huang@tw.synaptics.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
2020-10-04 19:51:44 -07:00

242 lines
6.0 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2012-2020 Synaptics Incorporated
*/
#include <linux/kernel.h>
#include <linux/rmi.h>
#include <linux/input.h>
#include <linux/slab.h>
#include "rmi_driver.h"
#define RMI_F3A_MAX_GPIO_COUNT 128
#define RMI_F3A_MAX_REG_SIZE DIV_ROUND_UP(RMI_F3A_MAX_GPIO_COUNT, 8)
/* Defs for Query 0 */
#define RMI_F3A_GPIO_COUNT 0x7F
#define RMI_F3A_DATA_REGS_MAX_SIZE RMI_F3A_MAX_REG_SIZE
#define TRACKSTICK_RANGE_START 3
#define TRACKSTICK_RANGE_END 6
struct f3a_data {
/* Query Data */
u8 gpio_count;
u8 register_count;
u8 data_regs[RMI_F3A_DATA_REGS_MAX_SIZE];
u16 *gpio_key_map;
struct input_dev *input;
struct rmi_function *f03;
bool trackstick_buttons;
};
static void rmi_f3a_report_button(struct rmi_function *fn,
struct f3a_data *f3a, unsigned int button)
{
u16 key_code = f3a->gpio_key_map[button];
bool key_down = !(f3a->data_regs[0] & BIT(button));
if (f3a->trackstick_buttons &&
button >= TRACKSTICK_RANGE_START &&
button <= TRACKSTICK_RANGE_END) {
rmi_f03_overwrite_button(f3a->f03, key_code, key_down);
} else {
rmi_dbg(RMI_DEBUG_FN, &fn->dev,
"%s: call input report key (0x%04x) value (0x%02x)",
__func__, key_code, key_down);
input_report_key(f3a->input, key_code, key_down);
}
}
static irqreturn_t rmi_f3a_attention(int irq, void *ctx)
{
struct rmi_function *fn = ctx;
struct f3a_data *f3a = dev_get_drvdata(&fn->dev);
struct rmi_driver_data *drvdata = dev_get_drvdata(&fn->rmi_dev->dev);
int error;
int i;
if (drvdata->attn_data.data) {
if (drvdata->attn_data.size < f3a->register_count) {
dev_warn(&fn->dev,
"F3A interrupted, but data is missing\n");
return IRQ_HANDLED;
}
memcpy(f3a->data_regs, drvdata->attn_data.data,
f3a->register_count);
drvdata->attn_data.data += f3a->register_count;
drvdata->attn_data.size -= f3a->register_count;
} else {
error = rmi_read_block(fn->rmi_dev, fn->fd.data_base_addr,
f3a->data_regs, f3a->register_count);
if (error) {
dev_err(&fn->dev,
"%s: Failed to read F3a data registers: %d\n",
__func__, error);
return IRQ_RETVAL(error);
}
}
for (i = 0; i < f3a->gpio_count; i++)
if (f3a->gpio_key_map[i] != KEY_RESERVED)
rmi_f3a_report_button(fn, f3a, i);
if (f3a->trackstick_buttons)
rmi_f03_commit_buttons(f3a->f03);
return IRQ_HANDLED;
}
static int rmi_f3a_config(struct rmi_function *fn)
{
struct f3a_data *f3a = dev_get_drvdata(&fn->dev);
struct rmi_driver *drv = fn->rmi_dev->driver;
const struct rmi_device_platform_data *pdata =
rmi_get_platform_data(fn->rmi_dev);
if (!f3a)
return 0;
if (pdata->gpio_data.trackstick_buttons) {
/* Try [re-]establish link to F03. */
f3a->f03 = rmi_find_function(fn->rmi_dev, 0x03);
f3a->trackstick_buttons = f3a->f03 != NULL;
}
drv->set_irq_bits(fn->rmi_dev, fn->irq_mask);
return 0;
}
static bool rmi_f3a_is_valid_button(int button, struct f3a_data *f3a,
u8 *query1_regs, u8 *ctrl1_regs)
{
/* gpio exist && direction input */
return (query1_regs[0] & BIT(button)) && !(ctrl1_regs[0] & BIT(button));
}
static int rmi_f3a_map_gpios(struct rmi_function *fn, struct f3a_data *f3a,
u8 *query1_regs, u8 *ctrl1_regs)
{
const struct rmi_device_platform_data *pdata =
rmi_get_platform_data(fn->rmi_dev);
struct input_dev *input = f3a->input;
unsigned int button = BTN_LEFT;
unsigned int trackstick_button = BTN_LEFT;
bool button_mapped = false;
int i;
int button_count = min_t(u8, f3a->gpio_count, TRACKSTICK_RANGE_END);
f3a->gpio_key_map = devm_kcalloc(&fn->dev,
button_count,
sizeof(f3a->gpio_key_map[0]),
GFP_KERNEL);
if (!f3a->gpio_key_map) {
dev_err(&fn->dev, "Failed to allocate gpio map memory.\n");
return -ENOMEM;
}
for (i = 0; i < button_count; i++) {
if (!rmi_f3a_is_valid_button(i, f3a, query1_regs, ctrl1_regs))
continue;
if (pdata->gpio_data.trackstick_buttons &&
i >= TRACKSTICK_RANGE_START &&
i < TRACKSTICK_RANGE_END) {
f3a->gpio_key_map[i] = trackstick_button++;
} else if (!pdata->gpio_data.buttonpad || !button_mapped) {
f3a->gpio_key_map[i] = button;
input_set_capability(input, EV_KEY, button++);
button_mapped = true;
}
}
input->keycode = f3a->gpio_key_map;
input->keycodesize = sizeof(f3a->gpio_key_map[0]);
input->keycodemax = f3a->gpio_count;
if (pdata->gpio_data.buttonpad || (button - BTN_LEFT == 1))
__set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
return 0;
}
static int rmi_f3a_initialize(struct rmi_function *fn, struct f3a_data *f3a)
{
u8 query1[RMI_F3A_MAX_REG_SIZE];
u8 ctrl1[RMI_F3A_MAX_REG_SIZE];
u8 buf;
int error;
error = rmi_read(fn->rmi_dev, fn->fd.query_base_addr, &buf);
if (error < 0) {
dev_err(&fn->dev, "Failed to read general info register: %d\n",
error);
return -ENODEV;
}
f3a->gpio_count = buf & RMI_F3A_GPIO_COUNT;
f3a->register_count = DIV_ROUND_UP(f3a->gpio_count, 8);
/* Query1 -> gpio exist */
error = rmi_read_block(fn->rmi_dev, fn->fd.query_base_addr + 1,
query1, f3a->register_count);
if (error) {
dev_err(&fn->dev, "Failed to read query1 register\n");
return error;
}
/* Ctrl1 -> gpio direction */
error = rmi_read_block(fn->rmi_dev, fn->fd.control_base_addr + 1,
ctrl1, f3a->register_count);
if (error) {
dev_err(&fn->dev, "Failed to read control1 register\n");
return error;
}
error = rmi_f3a_map_gpios(fn, f3a, query1, ctrl1);
if (error)
return error;
return 0;
}
static int rmi_f3a_probe(struct rmi_function *fn)
{
struct rmi_device *rmi_dev = fn->rmi_dev;
struct rmi_driver_data *drv_data = dev_get_drvdata(&rmi_dev->dev);
struct f3a_data *f3a;
int error;
if (!drv_data->input) {
dev_info(&fn->dev, "F3A: no input device found, ignoring\n");
return -ENXIO;
}
f3a = devm_kzalloc(&fn->dev, sizeof(*f3a), GFP_KERNEL);
if (!f3a)
return -ENOMEM;
f3a->input = drv_data->input;
error = rmi_f3a_initialize(fn, f3a);
if (error)
return error;
dev_set_drvdata(&fn->dev, f3a);
return 0;
}
struct rmi_function_handler rmi_f3a_handler = {
.driver = {
.name = "rmi4_f3a",
},
.func = 0x3a,
.probe = rmi_f3a_probe,
.config = rmi_f3a_config,
.attention = rmi_f3a_attention,
};