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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_data {
char *compatible;
unsigned int status_bit;
int code;
char *label;
};
struct qcom_pmic_btn_priv {
u32 base;
u32 status_bit;
int code;
struct udevice *pmic;
};
#define PON_INT_RT_STS 0x10
#define PON_KPDPWR_N_SET 0
#define PON_RESIN_N_SET 1
#define PON_GEN3_RESIN_N_SET 6
#define PON_GEN3_KPDPWR_N_SET 7
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 const struct qcom_pmic_btn_data qcom_pmic_btn_data_table[] = {
{
.compatible = "qcom,pm8941-pwrkey",
.status_bit = PON_KPDPWR_N_SET,
.code = KEY_ENTER,
.label = "pwrkey",
},
{
.compatible = "qcom,pm8941-resin",
.status_bit = PON_RESIN_N_SET,
.code = KEY_DOWN,
.label = "vol_down",
},
{
.compatible = "qcom,pmk8350-pwrkey",
.status_bit = PON_GEN3_KPDPWR_N_SET,
.code = KEY_ENTER,
.label = "pwrkey",
},
{
.compatible = "qcom,pmk8350-resin",
.status_bit = PON_GEN3_RESIN_N_SET,
.code = KEY_DOWN,
.label = "vol_down",
},
};
static const struct qcom_pmic_btn_data *button_qcom_pmic_match(ofnode node)
{
int i;
for (i = 0; i < ARRAY_SIZE(qcom_pmic_btn_data_table); ++i) {
if (ofnode_device_is_compatible(node,
qcom_pmic_btn_data_table[i].compatible))
return &qcom_pmic_btn_data_table[i];
}
return NULL;
}
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);
const struct qcom_pmic_btn_data *btn_data;
ofnode node = dev_ofnode(dev);
int ret;
u64 base;
/* Ignore the top-level pon node */
if (!uc_plat->label)
return 0;
/* Get the data for the node compatible */
btn_data = button_qcom_pmic_match(node);
if (!btn_data)
return -EINVAL;
priv->status_bit = btn_data->status_bit;
priv->code = btn_data->code;
/* 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 PMIC function subtype %d\n", dev->name, ret);
return -ENXIO;
}
return 0;
}
static int button_qcom_pmic_bind(struct udevice *parent)
{
struct udevice *dev;
ofnode node;
int ret;
dev_for_each_subnode(node, parent) {
const struct qcom_pmic_btn_data *btn_data;
struct button_uc_plat *uc_plat;
const char *label;
if (!ofnode_is_enabled(node))
continue;
/* Get the data for the node compatible */
btn_data = button_qcom_pmic_match(node);
if (!btn_data) {
debug("Unknown button node '%s'\n", ofnode_get_name(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);
uc_plat->label = btn_data->label;
}
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" },
{ .compatible = "qcom,pmk8350-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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