diff options
Diffstat (limited to 'drivers/button/button-qcom-pmic.c')
| -rw-r--r-- | drivers/button/button-qcom-pmic.c | 218 |
1 files changed, 218 insertions, 0 deletions
diff --git a/drivers/button/button-qcom-pmic.c b/drivers/button/button-qcom-pmic.c new file mode 100644 index 00000000000..f9f0948ae09 --- /dev/null +++ b/drivers/button/button-qcom-pmic.c @@ -0,0 +1,218 @@ +// 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> +#include <time.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; + ulong last_release_time; +}; + +#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); + bool pressed; + int reg; + + if (get_timer_us(0) - priv->last_release_time < 25000) + return BUTTON_OFF; + + reg = pmic_reg_read(priv->pmic, priv->base + PON_INT_RT_STS); + if (reg < 0) + return 0; + + pressed = !!(reg & BIT(priv->status_bit)); + if (!pressed) + priv->last_release_time = get_timer_us(0); + + return pressed; +} + +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), +}; |