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// SPDX-License-Identifier: GPL-2.0+
/*
* Qualcomm generic pmic gpio driver
*
* (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
* (C) Copyright 2023 Linaro Ltd.
*/
#include <button.h>
#include <dt-bindings/input/linux-event-codes.h>
#include <dm.h>
#include <dm/device-internal.h>
#include <dm/lists.h>
#include <log.h>
#include <power/pmic.h>
#include <spmi/spmi.h>
#include <linux/bitops.h>
#define REG_TYPE 0x4
#define REG_SUBTYPE 0x5
struct qcom_pmic_btn_priv {
u32 base;
u32 status_bit;
int code;
struct udevice *pmic;
};
#define PON_INT_RT_STS 0x10
#define KPDPWR_ON_INT_BIT 0
#define RESIN_ON_INT_BIT 1
#define NODE_IS_PWRKEY(node) (!strncmp(ofnode_get_name(node), "pwrkey", strlen("pwrkey")))
#define NODE_IS_RESIN(node) (!strncmp(ofnode_get_name(node), "resin", strlen("resin")))
static enum button_state_t qcom_pwrkey_get_state(struct udevice *dev)
{
struct qcom_pmic_btn_priv *priv = dev_get_priv(dev);
int reg = pmic_reg_read(priv->pmic, priv->base + PON_INT_RT_STS);
if (reg < 0)
return 0;
return (reg & BIT(priv->status_bit)) != 0;
}
static int qcom_pwrkey_get_code(struct udevice *dev)
{
struct qcom_pmic_btn_priv *priv = dev_get_priv(dev);
return priv->code;
}
static int qcom_pwrkey_probe(struct udevice *dev)
{
struct button_uc_plat *uc_plat = dev_get_uclass_plat(dev);
struct qcom_pmic_btn_priv *priv = dev_get_priv(dev);
ofnode node = dev_ofnode(dev);
int ret;
u64 base;
/* Ignore the top-level pon node */
if (!uc_plat->label)
return 0;
/* the pwrkey and resin nodes are children of the "pon" node, get the
* PMIC device to use in pmic_reg_* calls.
*/
priv->pmic = dev->parent->parent;
/* Get the address of the parent pon node */
base = dev_read_addr(dev->parent);
if (base == FDT_ADDR_T_NONE) {
printf("%s: Can't find address\n", dev->name);
return -EINVAL;
}
priv->base = base;
/* Do a sanity check */
ret = pmic_reg_read(priv->pmic, priv->base + REG_TYPE);
if (ret != 0x1 && ret != 0xb) {
printf("%s: unexpected PMIC function type %d\n", dev->name, ret);
return -ENXIO;
}
ret = pmic_reg_read(priv->pmic, priv->base + REG_SUBTYPE);
if (ret < 0 || (ret & 0x7) == 0) {
printf("%s: unexpected PMCI function subtype %d\n", dev->name, ret);
return -ENXIO;
}
if (NODE_IS_PWRKEY(node)) {
priv->status_bit = 0;
priv->code = KEY_ENTER;
} else if (NODE_IS_RESIN(node)) {
priv->status_bit = 1;
priv->code = KEY_DOWN;
} else {
/* Should not get here! */
printf("Invalid pon node '%s' should be 'pwrkey' or 'resin'\n",
ofnode_get_name(node));
return -EINVAL;
}
return 0;
}
static int button_qcom_pmic_bind(struct udevice *parent)
{
struct udevice *dev;
ofnode node;
int ret;
dev_for_each_subnode(node, parent) {
struct button_uc_plat *uc_plat;
const char *label;
if (!ofnode_is_enabled(node))
continue;
ret = device_bind_driver_to_node(parent, "qcom_pwrkey",
ofnode_get_name(node),
node, &dev);
if (ret) {
printf("Failed to bind %s! %d\n", label, ret);
return ret;
}
uc_plat = dev_get_uclass_plat(dev);
if (NODE_IS_PWRKEY(node)) {
uc_plat->label = "pwrkey";
} else if (NODE_IS_RESIN(node)) {
uc_plat->label = "vol_down";
} else {
debug("Unknown button node '%s' should be 'pwrkey' or 'resin'\n",
ofnode_get_name(node));
device_unbind(dev);
}
}
return 0;
}
static const struct button_ops button_qcom_pmic_ops = {
.get_state = qcom_pwrkey_get_state,
.get_code = qcom_pwrkey_get_code,
};
static const struct udevice_id qcom_pwrkey_ids[] = {
{ .compatible = "qcom,pm8916-pon" },
{ .compatible = "qcom,pm8941-pon" },
{ .compatible = "qcom,pm8998-pon" },
{ }
};
U_BOOT_DRIVER(qcom_pwrkey) = {
.name = "qcom_pwrkey",
.id = UCLASS_BUTTON,
.of_match = qcom_pwrkey_ids,
.bind = button_qcom_pmic_bind,
.probe = qcom_pwrkey_probe,
.ops = &button_qcom_pmic_ops,
.priv_auto = sizeof(struct qcom_pmic_btn_priv),
};
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