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SubjectRe: [PATCH v3 2/2] Input: synaptics-rmi4 - add support for F3A


On Wed, Sep 30, 2020, at 2:41 AM, Vincent Huang wrote:
> 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>

> ---
> drivers/input/rmi4/Kconfig | 8 ++
> drivers/input/rmi4/Makefile | 1 +
> drivers/input/rmi4/rmi_bus.c | 3 +
> drivers/input/rmi4/rmi_driver.h | 1 +
> drivers/input/rmi4/rmi_f3a.c | 240 ++++++++++++++++++++++++++++++++
> 5 files changed, 253 insertions(+)
> create mode 100644 drivers/input/rmi4/rmi_f3a.c
>
> diff --git a/drivers/input/rmi4/Kconfig b/drivers/input/rmi4/Kconfig
> index a212ff706f74..16119f760d11 100644
> --- a/drivers/input/rmi4/Kconfig
> +++ b/drivers/input/rmi4/Kconfig
> @@ -100,6 +100,14 @@ config RMI4_F34
> device via the firmware loader interface. This is triggered using a
> sysfs attribute.
>
> +config RMI4_F3A
> + bool "RMI4 Function 3A (GPIO)"
> + help
> + Say Y here if you want to add support for RMI4 function 3A.
> +
> + Function 3A provides GPIO support for RMI4 devices. This includes
> + support for buttons on TouchPads and ClickPads.
> +
> config RMI4_F54
> bool "RMI4 Function 54 (Analog diagnostics)"
> depends on VIDEO_V4L2=y || (RMI4_CORE=m && VIDEO_V4L2=m)
> diff --git a/drivers/input/rmi4/Makefile b/drivers/input/rmi4/Makefile
> index f17631656987..02f14c846861 100644
> --- a/drivers/input/rmi4/Makefile
> +++ b/drivers/input/rmi4/Makefile
> @@ -10,6 +10,7 @@ rmi_core-$(CONFIG_RMI4_F11) += rmi_f11.o
> rmi_core-$(CONFIG_RMI4_F12) += rmi_f12.o
> rmi_core-$(CONFIG_RMI4_F30) += rmi_f30.o
> rmi_core-$(CONFIG_RMI4_F34) += rmi_f34.o rmi_f34v7.o
> +rmi_core-$(CONFIG_RMI4_F3A) += rmi_f3a.o
> rmi_core-$(CONFIG_RMI4_F54) += rmi_f54.o
> rmi_core-$(CONFIG_RMI4_F55) += rmi_f55.o
>
> diff --git a/drivers/input/rmi4/rmi_bus.c b/drivers/input/rmi4/rmi_bus.c
> index af706a583656..47d1b97ed6cf 100644
> --- a/drivers/input/rmi4/rmi_bus.c
> +++ b/drivers/input/rmi4/rmi_bus.c
> @@ -365,6 +365,9 @@ static struct rmi_function_handler *fn_handlers[] = {
> #ifdef CONFIG_RMI4_F34
> &rmi_f34_handler,
> #endif
> +#ifdef CONFIG_RMI4_F3A
> + &rmi_f3a_handler,
> +#endif
> #ifdef CONFIG_RMI4_F54
> &rmi_f54_handler,
> #endif
> diff --git a/drivers/input/rmi4/rmi_driver.h b/drivers/input/rmi4/rmi_driver.h
> index 65bfaa95e193..1c6c6086c0e5 100644
> --- a/drivers/input/rmi4/rmi_driver.h
> +++ b/drivers/input/rmi4/rmi_driver.h
> @@ -135,6 +135,7 @@ extern struct rmi_function_handler rmi_f11_handler;
> extern struct rmi_function_handler rmi_f12_handler;
> extern struct rmi_function_handler rmi_f30_handler;
> extern struct rmi_function_handler rmi_f34_handler;
> +extern struct rmi_function_handler rmi_f3a_handler;
> extern struct rmi_function_handler rmi_f54_handler;
> extern struct rmi_function_handler rmi_f55_handler;
> #endif
> diff --git a/drivers/input/rmi4/rmi_f3a.c b/drivers/input/rmi4/rmi_f3a.c
> new file mode 100644
> index 000000000000..11ff35f811b0
> --- /dev/null
> +++ b/drivers/input/rmi4/rmi_f3a.c
> @@ -0,0 +1,240 @@
> +// 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,
> +};
> --
> 2.25.1
>
>

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