Difuse/difos
2
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

ramips: add Semtech SX9512 touch input driver

Browse source 
This driver is required for the touch-inputs as well as some LEDs on the
Genexis Pulse EX400.

The driver was also sent upstream. As the EX400 is currently the only
consumer, the driver is added target-specific for ramips.

Once the driver has been accepted upstream and is provided in a kernel
release used by OpenWrt, the package should be moved to the global input
drivers.

Link: https://www.spinics.net/lists/kernel/msg5669349.html

Signed-off-by: David Bauer <mail@david-bauer.net>
This commit is contained in:
David Bauer 2025-05-04 04:47:32 +02:00
parent ff55daf1eb
commit 0842e79338
2 changed files with 578 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

18
target/linux/ramips/modules.mk
View file

@ -152,3 +152,21 @@ define KernelPackage/sound-mt7620/description
endef
$(eval $(call KernelPackage,sound-mt7620))
define KernelPackage/keyboard-sx951x
SUBMENU:=Other modules
TITLE:=Semtech SX9512/SX9513
DEPENDS:=@TARGET_ramips_mt7621 +kmod-input-core
KCONFIG:= \
CONFIG_KEYBOARD_SX951X \
CONFIG_INPUT_KEYBOARD=y
FILES:=$(LINUX_DIR)/drivers/input/keyboard/sx951x.ko
AUTOLOAD:=$(call AutoProbe,sx951x)
endef
define KernelPackage/keyboard-sx951x/description
Enable support for SX9512/SX9513 capacitive touch controllers
endef
$(eval $(call KernelPackage,keyboard-sx951x))

560
target/linux/ramips/patches-6.6/870-Input-sx951x-add-Semtech-SX9512-SX9513-driver.patch Normal file
View file

@ -0,0 +1,560 @@
From ba92c0187006e2a6eae9573a569d275b0bd31732 Mon Sep 17 00:00:00 2001
From: David Bauer <mail@david-bauer.net>
Date: Fri, 2 May 2025 23:04:27 +0200
Subject: [PATCH] Input sx951x: add Semtech SX9512/SX9513 driver
The Semtech SX9512/SX9513 is a family of capacitive touch-keyboard
controllers.
All chips offer 8 channel touch sensitive inputs with one LED driver per
output channel.
The also SX9512 supports proximity detection which is currently not
supported with the driver.
This chip can be found on the Genexis Pulse EX400 repeater platform.
Link: https://www.mouser.com/datasheet/2/761/SEMTS05226_1-2575172.pdf
Link: https://www.spinics.net/lists/kernel/msg5669349.html
Signed-off-by: David Bauer <mail@david-bauer.net>
---
drivers/input/keyboard/Kconfig | 11 +
drivers/input/keyboard/Makefile | 1 +
drivers/input/keyboard/sx951x.c | 490 ++++++++++++++++++++++++++++++++
3 files changed, 502 insertions(+)
create mode 100644 drivers/input/keyboard/sx951x.c
diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
index 1d0c5f4c0f99..6dc397389c64 100644
--- a/drivers/input/keyboard/Kconfig
+++ b/drivers/input/keyboard/Kconfig
@@ -616,6 +616,17 @@ config KEYBOARD_SUNKBD
To compile this driver as a module, choose M here: the
module will be called sunkbd.
+config KEYBOARD_SX951X
+ tristate "Semtech SX951X capacitive touch controller"
+ depends on OF && I2C
+ select REGMAP_I2C
+ help
+ Say Y here to enable the Semtech SX9512/SX9153 capacitive
+ touch controller driver.
+
+ To compile this driver as a module, choose M here: the
+ module will be called sx951x.
+
config KEYBOARD_SH_KEYSC
tristate "SuperH KEYSC keypad support"
depends on ARCH_SHMOBILE || COMPILE_TEST
diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile
index aecef00c5d09..e59ca83c30ec 100644
--- a/drivers/input/keyboard/Makefile
+++ b/drivers/input/keyboard/Makefile
@@ -66,6 +66,7 @@ obj-$(CONFIG_KEYBOARD_STOWAWAY) += stowaway.o
obj-$(CONFIG_KEYBOARD_ST_KEYSCAN) += st-keyscan.o
obj-$(CONFIG_KEYBOARD_SUN4I_LRADC) += sun4i-lradc-keys.o
obj-$(CONFIG_KEYBOARD_SUNKBD) += sunkbd.o
+obj-$(CONFIG_KEYBOARD_SX951X) += sx951x.o
obj-$(CONFIG_KEYBOARD_TC3589X) += tc3589x-keypad.o
obj-$(CONFIG_KEYBOARD_TEGRA) += tegra-kbc.o
obj-$(CONFIG_KEYBOARD_TM2_TOUCHKEY) += tm2-touchkey.o
diff --git a/drivers/input/keyboard/sx951x.c b/drivers/input/keyboard/sx951x.c
new file mode 100644
index 000000000000..66355036aa95
--- /dev/null
+++ b/drivers/input/keyboard/sx951x.c
@@ -0,0 +1,490 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Input driver for Semtech SX9512/SX9513 capacitive touch sensors.
+ *
+ * The difference between SX9512 and SX9513 is the presence of proximity
+ * sensing capabilities on the SX9512.
+ *
+ * SX951xB is the identical chip but with a different I2C address.
+ *
+ * (c) 2025 David Bauer <mail@david-bauer.net>
+ */
+
+ #include <linux/kernel.h>
+ #include <linux/module.h>
+ #include <linux/input.h>
+ #include <linux/leds.h>
+ #include <linux/of.h>
+ #include <linux/regmap.h>
+ #include <linux/i2c.h>
+ #include <linux/gpio/consumer.h>
+ #include <linux/bitfield.h>
+
+ /* Generic properties */
+#define SX951X_I2C_ADDRESS 0x2b
+#define SX951XB_I2C_ADDRESS_ 0x2d
+#define SX951X_NUM_CHANNELS 8
+#define SX951X_POLL_INTERVAL 100
+
+/* Registers*/
+#define SX951X_REG_IRQ_SRC 0x00
+#define SX951X_REG_TOUCH_STATUS 0x01
+#define SX951X_REG_PROXIMITY_STATUS 0x02
+#define SX951X_REG_COMPENSATION_STATUS 0x03
+#define SX951X_REG_IRQ_NVM_CTRL 0x04
+#define SX951X_REG_SPO2_MODE_CTRL 0x07
+#define SX951X_REG_PWR_KEY_CTRL 0x08
+#define SX951X_REG_IRQ_MASK 0x09
+
+/* LED registers */
+#define SX951X_REG_LED_MAP_ENG1 0x0c
+#define SX951X_REG_LED_MAP_ENG2 0x0d
+#define SX951X_REG_LED_PWM_FREQ 0x0e
+#define SX951X_REG_LED_MODE 0x0f
+#define SX951X_REG_LED_IDLE 0x10
+#define SX951X_REG_LED_OFF_DELAY 0x11
+#define SX951X_REG_LED_ON_ENG1 0x12
+#define SX951X_REG_LED_FADE_ENG1 0x13
+#define SX951X_REG_LED_ON_ENG2 0x14
+#define SX951X_REG_LED_FADE_ENG2 0x15
+#define SX951X_REG_LED_POWER_IDLE 0x16
+#define SX951X_REG_LED_POWER_ON 0x17
+#define SX951X_REG_LED_POWER_OFF 0x18
+#define SX951X_REG_LED_POWER_FADE 0x19
+#define SX951X_REG_LED_POWER_ON_PULSE 0x1a
+#define SX951X_REG_LED_POWER_MODE 0x1b
+
+/* Capacitive touch sensing registers*/
+#define SX951X_REG_CAP_SENSE_ENABLE 0x1e
+
+#define SX951X_REG_CAP_SENSE_RANGE(x) (0x1f + (x))
+#define SX951X_REG_CAP_SENSE_RANGE_CIN_DELTA_MASK GENMASK(1, 0)
+
+#define SX951X_REG_CAP_SENSE_THRESH(x) (0x28 + (x))
+#define SX951X_REG_CAP_SENSE_THRESH_ALL 0x30
+
+#define SX951X_REG_CAP_SENSE_OP 0x31
+#define SX951X_REG_CAP_SENSE_MODE 0x32
+#define SX951X_REG_CAP_SENSE_DEBOUNCE 0x33
+
+/* Reset register*/
+#define SX951X_REG_SOFT_RESET 0xff
+
+/* Default properties (keys)*/
+#define SX951X_KEY_DEFAULT_CIN_DELTA 0x03
+#define SX951X_KEY_DEFAULT_SENSE_THRESHOLD 0x04
+
+struct sx951x_key_data {
+ u32 cin_delta;
+ u32 sense_threshold;
+};
+
+struct sx951x_led {
+#ifdef CONFIG_LEDS_CLASS
+ struct led_classdev cdev;
+ struct sx951x_priv *priv;
+
+ u32 reg;
+ bool registered;
+#endif
+};
+
+struct sx951x_priv {
+ struct regmap *regmap;
+ struct device *dev;
+ struct input_dev *idev;
+ const struct sx951x_hw_data *hw;
+
+ struct sx951x_led leds[SX951X_NUM_CHANNELS];
+
+ /* device-config */
+ u32 poll_interval;
+
+ /* key-config */
+ u32 keycodes[SX951X_NUM_CHANNELS];
+ struct sx951x_key_data key_data[SX951X_NUM_CHANNELS];
+};
+
+struct sx951x_hw_data {
+ bool has_proximity_sensing;
+};
+
+static const struct reg_default sx951x_reg_defaults[] = {
+ { SX951X_REG_LED_MAP_ENG1, 0x00 },
+ { SX951X_REG_LED_MAP_ENG2, 0x00 },
+ { SX951X_REG_LED_PWM_FREQ, 0x10 },
+ { SX951X_REG_LED_IDLE, 0xff },
+ { SX951X_REG_LED_ON_ENG1, 0xff },
+ { SX951X_REG_LED_ON_ENG2, 0xff },
+ { SX951X_REG_LED_POWER_IDLE, 0xff },
+ { SX951X_REG_LED_POWER_ON, 0xff },
+ { SX951X_REG_CAP_SENSE_ENABLE, 0x00 },
+ { SX951X_REG_CAP_SENSE_RANGE(0), 0x40 },
+ { SX951X_REG_CAP_SENSE_RANGE(1), 0x40 },
+ { SX951X_REG_CAP_SENSE_RANGE(2), 0x40 },
+ { SX951X_REG_CAP_SENSE_RANGE(3), 0x40 },
+ { SX951X_REG_CAP_SENSE_RANGE(4), 0x40 },
+ { SX951X_REG_CAP_SENSE_RANGE(5), 0x40 },
+ { SX951X_REG_CAP_SENSE_RANGE(6), 0x40 },
+ { SX951X_REG_CAP_SENSE_RANGE(7), 0x40 },
+ { SX951X_REG_CAP_SENSE_THRESH(0), 0x0f },
+ { SX951X_REG_CAP_SENSE_THRESH(1), 0x0f },
+ { SX951X_REG_CAP_SENSE_THRESH(2), 0x0f },
+ { SX951X_REG_CAP_SENSE_THRESH(3), 0x0f },
+ { SX951X_REG_CAP_SENSE_THRESH(4), 0x0f },
+ { SX951X_REG_CAP_SENSE_THRESH(5), 0x0f },
+ { SX951X_REG_CAP_SENSE_THRESH(6), 0x0f },
+ { SX951X_REG_CAP_SENSE_THRESH(7), 0x0f },
+ { SX951X_REG_CAP_SENSE_THRESH_ALL, 0x0f },
+ { SX951X_REG_CAP_SENSE_OP, 0x14 },
+ { SX951X_REG_CAP_SENSE_MODE, 0x70 },
+ { SX951X_REG_CAP_SENSE_DEBOUNCE, 0xff },
+};
+
+static bool sx951x_volatile_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case SX951X_REG_TOUCH_STATUS:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static const struct regmap_config sx951x_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+
+ .max_register = SX951X_REG_SOFT_RESET,
+
+ .reg_defaults = sx951x_reg_defaults,
+ .num_reg_defaults = ARRAY_SIZE(sx951x_reg_defaults),
+
+ .cache_type = REGCACHE_MAPLE,
+ .volatile_reg = sx951x_volatile_reg,
+};
+
+#ifdef CONFIG_LEDS_CLASS
+static int sx951x_led_set(struct led_classdev *cdev, enum led_brightness value)
+{
+ struct sx951x_led *led = container_of(cdev, struct sx951x_led, cdev);
+ struct sx951x_priv *priv = led->priv;
+
+ return regmap_update_bits(priv->regmap,
+ SX951X_REG_LED_MAP_ENG2,
+ BIT(led->reg),
+ value ? BIT(led->reg) : 0);
+}
+
+static int sx951x_led_init(struct sx951x_priv *priv,
+ struct device_node *channel_node, u32 reg)
+{
+ struct device_node *led_node;
+ struct sx951x_led *led = &priv->leds[reg];
+ struct led_init_data init_data = {};
+ int error;
+
+ if (led->registered) {
+ dev_err(priv->dev,
+ "LED %d already registered\n", reg);
+ return -EINVAL;
+ }
+
+ led_node = of_get_child_by_name(channel_node, "led");
+ if (!led_node) {
+ /* No LED */
+ return 0;
+ }
+
+ led->cdev.flags = 0;
+ led->cdev.brightness_set_blocking = sx951x_led_set;
+ led->cdev.max_brightness = 1;
+ led->cdev.brightness = LED_OFF;
+
+ init_data.default_label = of_get_property(led_node, "label", NULL);
+ init_data.fwnode = of_fwnode_handle(led_node);
+
+ led->reg = reg;
+ led->priv = priv;
+
+ error = devm_led_classdev_register_ext(priv->dev, &led->cdev, &init_data);
+ if (error)
+ return error;
+
+ return 0;
+}
+#endif
+
+static void sx951x_poll(struct input_dev *input)
+{
+ struct sx951x_priv *priv = input_get_drvdata(input);
+ struct device *dev = priv->dev;
+ unsigned int val;
+ int error;
+ int i;
+
+ error = regmap_read(priv->regmap, SX951X_REG_TOUCH_STATUS, &val);
+ if (error) {
+ dev_err(dev, "Failed to read touch status: %d\n", error);
+ return;
+ }
+
+ for (i = 0; i < SX951X_NUM_CHANNELS; i++) {
+ if (priv->keycodes[i] == KEY_RESERVED)
+ continue;
+
+ input_report_key(input, priv->keycodes[i], !!(val & BIT(i)));
+ input_sync(input);
+ }
+}
+
+static int sx951x_channel_init(struct sx951x_priv *priv, struct device_node *of_node,
+ u32 chan_idx)
+{
+ struct sx951x_key_data *key_data;
+ struct device *dev = priv->dev;
+ int error;
+
+ key_data = &priv->key_data[chan_idx];
+
+ /* Defaults */
+ key_data->cin_delta = SX951X_KEY_DEFAULT_CIN_DELTA;
+ key_data->sense_threshold = SX951X_KEY_DEFAULT_SENSE_THRESHOLD;
+
+ error = of_property_read_u32(of_node, "linux,keycodes",
+ &priv->keycodes[chan_idx]);
+ if (error) {
+ /* Not configured */
+ return 0;
+ }
+
+ error = of_property_read_u32(of_node, "semtech,cin-delta",
+ &key_data->cin_delta);
+ if (key_data->cin_delta > 0x03) {
+ dev_err(dev, "Failed to read cin-delta for channel %d: %d\n",
+ chan_idx, error);
+ return error;
+ }
+
+ error = of_property_read_u32(of_node, "semtech,sense-threshold",
+ &key_data->sense_threshold);
+ if (key_data->sense_threshold > 0xff) {
+ dev_err(dev, "Failed to read sense-threshold for channel %d: %d\n",
+ chan_idx, error);
+ return error;
+ }
+
+ error = regmap_update_bits(priv->regmap,
+ SX951X_REG_CAP_SENSE_RANGE(chan_idx),
+ SX951X_REG_CAP_SENSE_RANGE_CIN_DELTA_MASK,
+ key_data->cin_delta);
+
+ if (error) {
+ dev_err(dev, "Failed to set cin-delta for channel %d: %d\n",
+ chan_idx, error);
+ return error;
+ }
+
+ error = regmap_write(priv->regmap,
+ SX951X_REG_CAP_SENSE_THRESH(chan_idx),
+ key_data->sense_threshold);
+ if (error) {
+ dev_err(dev, "Failed to set sense-threshold for channel %d: %d\n",
+ chan_idx, error);
+ return error;
+ }
+
+ return 0;
+}
+
+static int sx951x_channels_init(struct sx951x_priv *priv)
+{
+ struct device *dev = priv->dev;
+ unsigned int channels = 0;
+ int error;
+ u32 reg;
+
+ for_each_child_of_node_scoped(dev->of_node, child) {
+ error = of_property_read_u32(child, "reg", &reg);
+ if (error != 0 || reg >= SX951X_NUM_CHANNELS) {
+ dev_err(dev, "Invalid channel %d\n", reg);
+ return -EINVAL;
+ }
+
+ priv->keycodes[reg] = KEY_RESERVED;
+
+ error = sx951x_channel_init(priv, child, reg);
+ if (error) {
+ dev_err(dev, "Failed to initialize channel %d: %d\n",
+ reg, error);
+ return error;
+ }
+
+ if (priv->keycodes[reg] != KEY_RESERVED)
+ channels |= BIT(reg);
+
+#ifdef CONFIG_LEDS_CLASS
+ error = sx951x_led_init(priv, child, reg);
+ if (error) {
+ dev_err(dev, "Failed to initialize LED %d: %d\n",
+ reg, error);
+ return error;
+ }
+#endif
+ }
+
+ /* Enable sensing on channels with keycode configured */
+ error = regmap_write(priv->regmap,
+ SX951X_REG_CAP_SENSE_ENABLE,
+ channels);
+
+ return 0;
+}
+
+static int sx951x_input_init(struct sx951x_priv *priv)
+{
+ struct device *dev = priv->dev;
+ int i, error;
+
+ priv->idev = devm_input_allocate_device(dev);
+ if (!priv->idev)
+ return -ENOMEM;
+
+ priv->idev->name = "SX9512/SX9513 capacitive touch sensor";
+ priv->idev->id.bustype = BUS_I2C;
+ __set_bit(EV_KEY, priv->idev->evbit);
+
+ for (i = 0; i < SX951X_NUM_CHANNELS; i++)
+ __set_bit(priv->keycodes[i], priv->idev->keybit);
+
+ __clear_bit(KEY_RESERVED, priv->idev->keybit);
+
+ priv->idev->keycode = priv->keycodes;
+ priv->idev->keycodesize = sizeof(priv->keycodes[0]);
+ priv->idev->keycodemax = SX951X_NUM_CHANNELS;
+
+ input_set_drvdata(priv->idev, priv);
+
+ error = input_setup_polling(priv->idev, sx951x_poll);
+ if (error) {
+ dev_err(dev, "Unable to set up polling: %d\n", error);
+ return error;
+ }
+
+ input_set_poll_interval(priv->idev, priv->poll_interval);
+
+ error = input_register_device(priv->idev);
+ if (error) {
+ dev_err(dev, "Unable to register polled device: %d\n",
+ error);
+ return error;
+ }
+
+ return 0;
+}
+
+static int sx951x_probe(struct i2c_client *i2c_client)
+{
+ const struct i2c_device_id *id;
+ const struct sx951x_hw_data *hw;
+ struct device *dev = &i2c_client->dev;
+ struct sx951x_priv *priv;
+ int error;
+
+ if (i2c_client->addr != SX951X_I2C_ADDRESS &&
+ i2c_client->addr != SX951XB_I2C_ADDRESS_) {
+ dev_err(dev, "Invalid I2C address: 0x%02x\n",
+ i2c_client->addr);
+ return -ENODEV;
+ }
+
+ id = i2c_client_get_device_id(i2c_client);
+ hw = i2c_get_match_data(i2c_client);
+ if (!id || !hw) {
+ dev_err(dev, "Invalid device configuration\n");
+ return -EINVAL;
+ }
+
+ priv = devm_kzalloc(dev,
+ sizeof(struct sx951x_priv),
+ GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->dev = dev;
+ priv->hw = hw;
+
+ priv->regmap = devm_regmap_init_i2c(i2c_client, &sx951x_regmap_config);
+ if (IS_ERR(priv->regmap))
+ return PTR_ERR(priv->regmap);
+
+ /* Parse device configuration */
+ if (of_property_read_u32(dev->of_node, "poll-interval",
+ &priv->poll_interval))
+ priv->poll_interval = SX951X_POLL_INTERVAL;
+
+ /* Register LED and input channels */
+ error = sx951x_channels_init(priv);
+ if (error) {
+ dev_err(dev, "Failed to initialize channels: %d\n", error);
+ return error;
+ }
+
+ /* Register input device */
+ error = sx951x_input_init(priv);
+ if (error) {
+ dev_err(dev, "Failed to register input device: %d\n", error);
+ return error;
+ }
+
+ return 0;
+}
+
+static void sx951x_remove(struct i2c_client *i2c_client)
+{
+ struct sx951x_priv *priv = i2c_get_clientdata(i2c_client);
+
+ /* Disable sensing */
+ regmap_write(priv->regmap, SX951X_REG_CAP_SENSE_ENABLE, 0x00);
+
+ /* Turn off all LEDs */
+ regmap_write(priv->regmap, SX951X_REG_LED_MAP_ENG2, 0x00);
+}
+
+static const struct sx951x_hw_data sx9512_hw_data = {
+ .has_proximity_sensing = true,
+};
+
+static const struct sx951x_hw_data sx9513_hw_data = {
+ .has_proximity_sensing = false,
+};
+
+static const struct of_device_id sx951x_dt_ids[] = {
+ { .compatible = "semtech,sx9512", .data = &sx9512_hw_data },
+ { .compatible = "semtech,sx9513", .data = &sx9513_hw_data },
+ { }
+};
+MODULE_DEVICE_TABLE(of, sx951x_dt_ids);
+
+static const struct i2c_device_id sx951x_i2c_ids[] = {
+ { "sx9512", (kernel_ulong_t)&sx9512_hw_data },
+ { "sx9513", (kernel_ulong_t)&sx9513_hw_data },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, sx951x_i2c_ids);
+
+static struct i2c_driver sx951x_i2c_driver = {
+ .driver = {
+ .name = "sx951x",
+ .of_match_table = sx951x_dt_ids,
+ },
+ .id_table = sx951x_i2c_ids,
+ .probe = sx951x_probe,
+ .remove = sx951x_remove,
+};
+
+module_i2c_driver(sx951x_i2c_driver);
+
+MODULE_DESCRIPTION("Semtech SX9512/SX9513 driver");
+MODULE_AUTHOR("David Bauer <mail@david-bauer.net>");
+MODULE_LICENSE("GPL");
--
2.47.2