diff options
Diffstat (limited to 'drivers/button')
| -rw-r--r-- | drivers/button/Kconfig | 40 | ||||
| -rw-r--r-- | drivers/button/Makefile | 8 | ||||
| -rw-r--r-- | drivers/button/button-adc.c | 157 | ||||
| -rw-r--r-- | drivers/button/button-gpio.c | 127 | ||||
| -rw-r--r-- | drivers/button/button-qcom-pmic.c | 165 | ||||
| -rw-r--r-- | drivers/button/button-uclass.c | 55 |
6 files changed, 552 insertions, 0 deletions
diff --git a/drivers/button/Kconfig b/drivers/button/Kconfig new file mode 100644 index 00000000000..3918b05ae03 --- /dev/null +++ b/drivers/button/Kconfig @@ -0,0 +1,40 @@ +menu "Button Support" + +config BUTTON + bool "Enable button support" + depends on DM + help + Many boards have buttons which can be used to change behaviour (reset, ...). + U-Boot provides a uclass API to implement this feature. Button drivers + can provide access to board-specific buttons. Use of the device tree + for configuration is encouraged. + +config BUTTON_ADC + bool "Button adc" + depends on BUTTON + depends on ADC + help + Enable support for buttons which are connected to Analog to Digital + Converter device. The ADC driver must use driver model. Buttons are + configured using the device tree. + +config BUTTON_GPIO + bool "Button gpio" + depends on BUTTON + depends on DM_GPIO + help + Enable support for buttons which are connected to GPIO lines. These + GPIOs may be on the SoC or some other device which provides GPIOs. + The GPIO driver must used driver model. Buttons are configured using + the device tree. + +config BUTTON_QCOM_PMIC + bool "Qualcomm power button" + depends on BUTTON + depends on PMIC_QCOM + help + Enable support for the power and "resin" (usually volume down) buttons + on Qualcomm SoCs. These will be configured as the Enter and Down keys + respectively, allowing navigation of bootmenu with buttons on device. + +endmenu diff --git a/drivers/button/Makefile b/drivers/button/Makefile new file mode 100644 index 00000000000..68555081a47 --- /dev/null +++ b/drivers/button/Makefile @@ -0,0 +1,8 @@ +# SPDX-License-Identifier: GPL-2.0+ +# +# Copyright (C) 2020 Philippe Reynes <philippe.reynes@softathome.com> + +obj-$(CONFIG_BUTTON) += button-uclass.o +obj-$(CONFIG_BUTTON_ADC) += button-adc.o +obj-$(CONFIG_BUTTON_GPIO) += button-gpio.o +obj-$(CONFIG_BUTTON_QCOM_PMIC) += button-qcom-pmic.o
\ No newline at end of file diff --git a/drivers/button/button-adc.c b/drivers/button/button-adc.c new file mode 100644 index 00000000000..9c24c960e6f --- /dev/null +++ b/drivers/button/button-adc.c @@ -0,0 +1,157 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2021 Samsung Electronics Co., Ltd. + * http://www.samsung.com + * Author: Marek Szyprowski <m.szyprowski@samsung.com> + */ + +#include <common.h> +#include <adc.h> +#include <button.h> +#include <log.h> +#include <dm.h> +#include <dm/lists.h> +#include <dm/of_access.h> +#include <dm/uclass-internal.h> + +/** + * struct button_adc_priv - private data for button-adc driver. + * + * @adc: Analog to Digital Converter device to which button is connected. + * @channel: channel of the ADC device to probe the button state. + * @min: minimal uV value to consider button as pressed. + * @max: maximal uV value to consider button as pressed. + */ +struct button_adc_priv { + struct udevice *adc; + int channel; + int min; + int max; +}; + +static enum button_state_t button_adc_get_state(struct udevice *dev) +{ + struct button_adc_priv *priv = dev_get_priv(dev); + unsigned int val; + int ret, uV; + + ret = adc_start_channel(priv->adc, priv->channel); + if (ret) + return ret; + + ret = adc_channel_data(priv->adc, priv->channel, &val); + if (ret) + return ret; + + ret = adc_raw_to_uV(priv->adc, val, &uV); + if (ret) + return ret; + + return (uV >= priv->min && uV < priv->max) ? BUTTON_ON : BUTTON_OFF; +} + +static int button_adc_of_to_plat(struct udevice *dev) +{ + struct button_uc_plat *uc_plat = dev_get_uclass_plat(dev); + struct button_adc_priv *priv = dev_get_priv(dev); + struct ofnode_phandle_args args; + u32 down_threshold = 0, up_threshold, voltage, t; + ofnode node; + int ret; + + /* Ignore the top-level button node */ + if (!uc_plat->label) + return 0; + + ret = dev_read_phandle_with_args(dev->parent, "io-channels", + "#io-channel-cells", 0, 0, &args); + if (ret) + return ret; + + ret = uclass_get_device_by_ofnode(UCLASS_ADC, args.node, &priv->adc); + if (ret) + return ret; + + ret = ofnode_read_u32(dev_ofnode(dev->parent), + "keyup-threshold-microvolt", &up_threshold); + if (ret) + return ret; + + ret = ofnode_read_u32(dev_ofnode(dev), "press-threshold-microvolt", + &voltage); + if (ret) + return ret; + + dev_for_each_subnode(node, dev->parent) { + ret = ofnode_read_u32(node, "press-threshold-microvolt", &t); + if (ret) + return ret; + + if (t > voltage && t < up_threshold) + up_threshold = t; + else if (t < voltage && t > down_threshold) + down_threshold = t; + } + + priv->channel = args.args[0]; + + /* + * Define the voltage range such that the button is only pressed + * when the voltage is closest to its own press-threshold-microvolt + */ + if (down_threshold == 0) + priv->min = 0; + else + priv->min = down_threshold + (voltage - down_threshold) / 2; + + priv->max = voltage + (up_threshold - voltage) / 2; + + return ret; +} + +static int button_adc_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; + + label = ofnode_read_string(node, "label"); + if (!label) { + debug("%s: node %s has no label\n", __func__, + ofnode_get_name(node)); + return -EINVAL; + } + ret = device_bind_driver_to_node(parent, "button_adc", + ofnode_get_name(node), + node, &dev); + if (ret) + return ret; + uc_plat = dev_get_uclass_plat(dev); + uc_plat->label = label; + } + + return 0; +} + +static const struct button_ops button_adc_ops = { + .get_state = button_adc_get_state, +}; + +static const struct udevice_id button_adc_ids[] = { + { .compatible = "adc-keys" }, + { } +}; + +U_BOOT_DRIVER(button_adc) = { + .name = "button_adc", + .id = UCLASS_BUTTON, + .of_match = button_adc_ids, + .ops = &button_adc_ops, + .priv_auto = sizeof(struct button_adc_priv), + .bind = button_adc_bind, + .of_to_plat = button_adc_of_to_plat, +}; diff --git a/drivers/button/button-gpio.c b/drivers/button/button-gpio.c new file mode 100644 index 00000000000..7b5b3affe2d --- /dev/null +++ b/drivers/button/button-gpio.c @@ -0,0 +1,127 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2020 Philippe Reynes <philippe.reynes@softathome.com> + */ + +#include <common.h> +#include <button.h> +#include <dm.h> +#include <dm/lists.h> +#include <dm/uclass-internal.h> +#include <log.h> +#include <asm/gpio.h> + +struct button_gpio_priv { + struct gpio_desc gpio; + int linux_code; +}; + +static enum button_state_t button_gpio_get_state(struct udevice *dev) +{ + struct button_gpio_priv *priv = dev_get_priv(dev); + int ret; + + if (!dm_gpio_is_valid(&priv->gpio)) + return -EREMOTEIO; + ret = dm_gpio_get_value(&priv->gpio); + if (ret < 0) + return ret; + + return ret ? BUTTON_ON : BUTTON_OFF; +} + +static int button_gpio_get_code(struct udevice *dev) +{ + struct button_gpio_priv *priv = dev_get_priv(dev); + int code = priv->linux_code; + + if (!code) + return -ENODATA; + + return code; +} + +static int button_gpio_probe(struct udevice *dev) +{ + struct button_uc_plat *uc_plat = dev_get_uclass_plat(dev); + struct button_gpio_priv *priv = dev_get_priv(dev); + int ret; + + /* Ignore the top-level button node */ + if (!uc_plat->label) + return 0; + + ret = gpio_request_by_name(dev, "gpios", 0, &priv->gpio, GPIOD_IS_IN); + if (ret) + return ret; + + ret = dev_read_u32(dev, "linux,code", &priv->linux_code); + + return ret; +} + +static int button_gpio_remove(struct udevice *dev) +{ + /* + * The GPIO driver may have already been removed. We will need to + * address this more generally. + */ + if (!IS_ENABLED(CONFIG_SANDBOX)) { + struct button_gpio_priv *priv = dev_get_priv(dev); + + if (dm_gpio_is_valid(&priv->gpio)) + dm_gpio_free(dev, &priv->gpio); + } + + return 0; +} + +static int button_gpio_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; + + label = ofnode_read_string(node, "label"); + if (!label) { + debug("%s: node %s has no label\n", __func__, + ofnode_get_name(node)); + return -EINVAL; + } + ret = device_bind_driver_to_node(parent, "button_gpio", + ofnode_get_name(node), + node, &dev); + if (ret) + return ret; + uc_plat = dev_get_uclass_plat(dev); + uc_plat->label = label; + } + + return 0; +} + +static const struct button_ops button_gpio_ops = { + .get_state = button_gpio_get_state, + .get_code = button_gpio_get_code, +}; + +static const struct udevice_id button_gpio_ids[] = { + { .compatible = "gpio-keys" }, + { .compatible = "gpio-keys-polled" }, + { } +}; + +U_BOOT_DRIVER(button_gpio) = { + .name = "button_gpio", + .id = UCLASS_BUTTON, + .of_match = button_gpio_ids, + .ops = &button_gpio_ops, + .priv_auto = sizeof(struct button_gpio_priv), + .bind = button_gpio_bind, + .probe = button_gpio_probe, + .remove = button_gpio_remove, +}; diff --git a/drivers/button/button-qcom-pmic.c b/drivers/button/button-qcom-pmic.c new file mode 100644 index 00000000000..bad445efa86 --- /dev/null +++ b/drivers/button/button-qcom-pmic.c @@ -0,0 +1,165 @@ +// 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), +}; diff --git a/drivers/button/button-uclass.c b/drivers/button/button-uclass.c new file mode 100644 index 00000000000..032191d61ab --- /dev/null +++ b/drivers/button/button-uclass.c @@ -0,0 +1,55 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2020 Philippe Reynes <philippe.reynes@softathome.com> + * + * Based on led-uclass.c + */ + +#define LOG_CATEGORY UCLASS_BUTTON + +#include <common.h> +#include <button.h> +#include <dm.h> +#include <dm/uclass-internal.h> + +int button_get_by_label(const char *label, struct udevice **devp) +{ + struct udevice *dev; + struct uclass *uc; + + uclass_id_foreach_dev(UCLASS_BUTTON, dev, uc) { + struct button_uc_plat *uc_plat = dev_get_uclass_plat(dev); + + /* Ignore the top-level button node */ + if (uc_plat->label && !strcmp(label, uc_plat->label)) + return uclass_get_device_tail(dev, 0, devp); + } + + return -ENODEV; +} + +enum button_state_t button_get_state(struct udevice *dev) +{ + struct button_ops *ops = button_get_ops(dev); + + if (!ops->get_state) + return -ENOSYS; + + return ops->get_state(dev); +} + +int button_get_code(struct udevice *dev) +{ + struct button_ops *ops = button_get_ops(dev); + + if (!ops->get_code) + return -ENOSYS; + + return ops->get_code(dev); +} + +UCLASS_DRIVER(button) = { + .id = UCLASS_BUTTON, + .name = "button", + .per_device_plat_auto = sizeof(struct button_uc_plat), +}; |