--- /dev/null
+// 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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