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// 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,
};
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