input: add support for CPCAP power button

CPCAP has a dedicated interrupt for power button. Implement this to have
more input control over the devices.

Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>

diff --git a/drivers/input/Kconfig b/drivers/input/Kconfig
index c2b365a..c09f0ae 100644 (file)
--- a/drivers/input/Kconfig
+++ b/drivers/input/Kconfig
@@ -55,6 +55,12 @@ config BUTTON_KEYBOARD
          dt node to define button-event mapping.
          For example, an arrows and enter may be implemented to navigate boot menu.
 
+config CPCAP_POWER_BUTTON
+       bool "Enable power button of CPCAP PMIC support"
+       depends on DM_KEYBOARD && DM_PMIC_CPCAP
+       help
+         Enable support for a dedicated power button of the CPCAP PMIC.
+
 config CROS_EC_KEYB
        bool "Enable Chrome OS EC keyboard support"
        depends on INPUT

diff --git a/drivers/input/Makefile b/drivers/input/Makefile
index 8d4107b..1303fcd 100644 (file)
--- a/drivers/input/Makefile
+++ b/drivers/input/Makefile
@@ -7,6 +7,7 @@ obj-$(CONFIG_$(PHASE_)CROS_EC_KEYB) += cros_ec_keyb.o
 obj-$(CONFIG_$(PHASE_)OF_CONTROL) += key_matrix.o
 obj-$(CONFIG_$(PHASE_)DM_KEYBOARD) += input.o keyboard-uclass.o
 obj-$(CONFIG_BUTTON_KEYBOARD) += button_kbd.o
+obj-$(CONFIG_CPCAP_POWER_BUTTON) += cpcap_pwrbutton.o
 
 ifndef CONFIG_XPL_BUILD
 

diff --git a/drivers/input/cpcap_pwrbutton.c b/drivers/input/cpcap_pwrbutton.c
new file mode 100644 (file)
index 0000000..c8ad39d
--- /dev/null
+++ b/drivers/input/cpcap_pwrbutton.c
@@ -0,0 +1,134 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ *  Copyright(C) 2025 Svyatoslav Ryhel <clamor95@gmail.com>
+ */
+
+#include <stdlib.h>
+#include <dm.h>
+#include <input.h>
+#include <keyboard.h>
+#include <power/pmic.h>
+#include <power/cpcap.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/input.h>
+
+static const unsigned int cpcpap_to_reg[] = {
+       CPCAP_REG_INT1,
+       CPCAP_REG_INT2,
+       CPCAP_REG_INT3,
+       CPCAP_REG_INT4,
+};
+
+/**
+ * struct cpcap_pwrbutton_priv
+ *
+ * @bank: id of interrupt bank co-responding to an IRQ register
+ * @id: id of interrupt pin co-responding to the bit in IRQ register
+ * @keycode: linux key code
+ * @old_state: holder of last button state
+ * @skip: holder of keycode skip state. This is required since both pressing
+ *        and releasing generate same event and cause key send duplication.
+ */
+struct cpcap_pwrbutton_priv {
+       u32 bank;
+       u32 id;
+
+       u32 keycode;
+
+       bool old_state;
+       bool skip;
+};
+
+static int cpcap_pwrbutton_read_keys(struct input_config *input)
+{
+       struct udevice *dev = input->dev;
+       struct cpcap_pwrbutton_priv *priv = dev_get_priv(dev);
+       u32 value, state_changed;
+       bool state;
+
+       value = pmic_reg_read(dev->parent, cpcpap_to_reg[priv->bank]) &
+                             BIT(priv->id);
+
+       /* Interrupt bit is cleared by writing it to interrupt reg */
+       pmic_reg_write(dev->parent, cpcpap_to_reg[priv->bank], BIT(priv->id));
+
+       state = value >> priv->id;
+       state_changed = state != priv->old_state;
+
+       if (state_changed && !priv->skip) {
+               priv->old_state = state;
+               input_add_keycode(input, priv->keycode, state);
+       }
+
+       if (state)
+               priv->skip = !priv->skip;
+
+       return 0;
+}
+
+static int cpcap_pwrbutton_of_to_plat(struct udevice *dev)
+{
+       struct cpcap_pwrbutton_priv *priv = dev_get_priv(dev);
+       ofnode irq_parent;
+       u32 irq_desc;
+       int ret;
+
+       /* Check interrupt parent, driver supports only CPCAP as parent */
+       irq_parent = ofnode_parse_phandle(dev_ofnode(dev), "interrupt-parent", 0);
+       if (!ofnode_device_is_compatible(irq_parent, "motorola,cpcap"))
+               return -EINVAL;
+
+       ret = dev_read_u32(dev, "interrupts", &irq_desc);
+       if (ret)
+               return ret;
+
+       /* IRQ registers are 16 bit wide */
+       priv->bank = irq_desc / 16;
+       priv->id = irq_desc % 16;
+
+       ret = dev_read_u32(dev, "linux,code", &priv->keycode);
+       if (ret)
+               return ret;
+
+       priv->old_state = false;
+       priv->skip = false;
+       return 0;
+}
+
+static int cpcap_pwrbutton_probe(struct udevice *dev)
+{
+       struct keyboard_priv *uc_priv = dev_get_uclass_priv(dev);
+       struct stdio_dev *sdev = &uc_priv->sdev;
+       struct input_config *input = &uc_priv->input;
+       int ret;
+
+       input_init(input, false);
+       input_add_tables(input, false);
+
+       /* Register the device */
+       input->dev = dev;
+       input->read_keys = cpcap_pwrbutton_read_keys;
+       strcpy(sdev->name, "cpcap-pwrbutton");
+       ret = input_stdio_register(sdev);
+       if (ret) {
+               log_debug("%s: input_stdio_register() failed\n", __func__);
+               return ret;
+       }
+
+       return 0;
+}
+
+static const struct udevice_id cpcap_pwrbutton_ids[] = {
+       { .compatible = "motorola,cpcap-pwrbutton" },
+       { }
+};
+
+U_BOOT_DRIVER(cpcap_pwrbutton) = {
+       .name           = "cpcap_pwrbutton",
+       .id             = UCLASS_KEYBOARD,
+       .of_match       = cpcap_pwrbutton_ids,
+       .of_to_plat     = cpcap_pwrbutton_of_to_plat,
+       .probe          = cpcap_pwrbutton_probe,
+       .priv_auto      = sizeof(struct cpcap_pwrbutton_priv),
+};