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button: qcom-pmic: introduce Qualcomm PMIC button driver
Qualcomm PMICs include a "pon" function which handles two buttons, the power button and "resin" button (usually volume down). Introduce a new driver following upstream Linux DT to enable these and map them to Enter and Down respectively to enable use in boot menus. Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org> Reviewed-by: Sumit Garg <sumit.garg@linaro.org> Tested-by: Sumit Garg <sumit.garg@linaro.org> Reviewed-by: Simon Glass <sjg@chromium.org> Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
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4 changed files with 176 additions and 0 deletions
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@ -575,6 +575,7 @@ M: Neil Armstrong <neil.armstrong@linaro.org>
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R: Sumit Garg <sumit.garg@linaro.org>
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S: Maintained
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F: arch/arm/mach-snapdragon/
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F: drivers/button/button-qcom-pmic.c
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F: drivers/clk/qcom/
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F: drivers/gpio/msm_gpio.c
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F: drivers/mmc/msm_sdhci.c
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@ -27,4 +27,13 @@ config BUTTON_GPIO
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The GPIO driver must used driver model. Buttons are configured using
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the device tree.
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config BUTTON_QCOM_PMIC
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bool "Qualcomm power button"
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depends on BUTTON
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depends on PMIC_QCOM
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help
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Enable support for the power and "resin" (usually volume down) buttons
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on Qualcomm SoCs. These will be configured as the Enter and Down keys
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respectively, allowing navigation of bootmenu with buttons on device.
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endmenu
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@ -5,3 +5,4 @@
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obj-$(CONFIG_BUTTON) += button-uclass.o
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obj-$(CONFIG_BUTTON_ADC) += button-adc.o
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obj-$(CONFIG_BUTTON_GPIO) += button-gpio.o
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obj-$(CONFIG_BUTTON_QCOM_PMIC) += button-qcom-pmic.o
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165
drivers/button/button-qcom-pmic.c
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165
drivers/button/button-qcom-pmic.c
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@ -0,0 +1,165 @@
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// SPDX-License-Identifier: GPL-2.0+
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/*
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* Qualcomm generic pmic gpio driver
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*
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* (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
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* (C) Copyright 2023 Linaro Ltd.
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*/
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#include <button.h>
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#include <dt-bindings/input/linux-event-codes.h>
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#include <dm.h>
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#include <dm/device-internal.h>
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#include <dm/lists.h>
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#include <log.h>
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#include <power/pmic.h>
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#include <spmi/spmi.h>
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#include <linux/bitops.h>
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#define REG_TYPE 0x4
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#define REG_SUBTYPE 0x5
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struct qcom_pmic_btn_priv {
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u32 base;
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u32 status_bit;
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int code;
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struct udevice *pmic;
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};
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#define PON_INT_RT_STS 0x10
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#define KPDPWR_ON_INT_BIT 0
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#define RESIN_ON_INT_BIT 1
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#define NODE_IS_PWRKEY(node) (!strncmp(ofnode_get_name(node), "pwrkey", strlen("pwrkey")))
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#define NODE_IS_RESIN(node) (!strncmp(ofnode_get_name(node), "resin", strlen("resin")))
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static enum button_state_t qcom_pwrkey_get_state(struct udevice *dev)
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{
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struct qcom_pmic_btn_priv *priv = dev_get_priv(dev);
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int reg = pmic_reg_read(priv->pmic, priv->base + PON_INT_RT_STS);
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if (reg < 0)
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return 0;
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return (reg & BIT(priv->status_bit)) != 0;
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}
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static int qcom_pwrkey_get_code(struct udevice *dev)
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{
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struct qcom_pmic_btn_priv *priv = dev_get_priv(dev);
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return priv->code;
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}
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static int qcom_pwrkey_probe(struct udevice *dev)
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{
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struct button_uc_plat *uc_plat = dev_get_uclass_plat(dev);
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struct qcom_pmic_btn_priv *priv = dev_get_priv(dev);
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ofnode node = dev_ofnode(dev);
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int ret;
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u64 base;
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/* Ignore the top-level pon node */
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if (!uc_plat->label)
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return 0;
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/* the pwrkey and resin nodes are children of the "pon" node, get the
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* PMIC device to use in pmic_reg_* calls.
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*/
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priv->pmic = dev->parent->parent;
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/* Get the address of the parent pon node */
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base = dev_read_addr(dev->parent);
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if (base == FDT_ADDR_T_NONE) {
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printf("%s: Can't find address\n", dev->name);
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return -EINVAL;
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}
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priv->base = base;
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/* Do a sanity check */
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ret = pmic_reg_read(priv->pmic, priv->base + REG_TYPE);
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if (ret != 0x1 && ret != 0xb) {
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printf("%s: unexpected PMIC function type %d\n", dev->name, ret);
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return -ENXIO;
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}
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ret = pmic_reg_read(priv->pmic, priv->base + REG_SUBTYPE);
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if ((ret & 0x7) == 0) {
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printf("%s: unexpected PMCI function subtype %d\n", dev->name, ret);
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return -ENXIO;
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}
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if (NODE_IS_PWRKEY(node)) {
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priv->status_bit = 0;
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priv->code = KEY_ENTER;
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} else if (NODE_IS_RESIN(node)) {
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priv->status_bit = 1;
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priv->code = KEY_DOWN;
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} else {
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/* Should not get here! */
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printf("Invalid pon node '%s' should be 'pwrkey' or 'resin'\n",
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ofnode_get_name(node));
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return -EINVAL;
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}
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return 0;
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}
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static int button_qcom_pmic_bind(struct udevice *parent)
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{
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struct udevice *dev;
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ofnode node;
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int ret;
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dev_for_each_subnode(node, parent) {
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struct button_uc_plat *uc_plat;
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const char *label;
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if (!ofnode_is_enabled(node))
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continue;
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ret = device_bind_driver_to_node(parent, "qcom_pwrkey",
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ofnode_get_name(node),
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node, &dev);
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if (ret) {
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printf("Failed to bind %s! %d\n", label, ret);
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return ret;
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}
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uc_plat = dev_get_uclass_plat(dev);
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if (NODE_IS_PWRKEY(node)) {
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uc_plat->label = "pwrkey";
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} else if (NODE_IS_RESIN(node)) {
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uc_plat->label = "vol_down";
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} else {
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printf("Unknown button node '%s' should be 'pwrkey' or 'resin'\n",
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ofnode_get_name(node));
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device_unbind(dev);
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}
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}
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return 0;
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}
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static const struct button_ops button_qcom_pmic_ops = {
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.get_state = qcom_pwrkey_get_state,
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.get_code = qcom_pwrkey_get_code,
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};
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static const struct udevice_id qcom_pwrkey_ids[] = {
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{ .compatible = "qcom,pm8916-pon" },
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{ .compatible = "qcom,pm8941-pon" },
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{ .compatible = "qcom,pm8998-pon" },
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{ }
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};
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U_BOOT_DRIVER(qcom_pwrkey) = {
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.name = "qcom_pwrkey",
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.id = UCLASS_BUTTON,
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.of_match = qcom_pwrkey_ids,
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.bind = button_qcom_pmic_bind,
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.probe = qcom_pwrkey_probe,
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.ops = &button_qcom_pmic_ops,
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.priv_auto = sizeof(struct qcom_pmic_btn_priv),
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};
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