/* * axp20x power button driver. * * Copyright (C) 2013 Carlo Caione <carlo@caione.org> * * This file is subject to the terms and conditions of the GNU General * Public License. See the file "COPYING" in the main directory of this * archive for more details. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #include <linux/acpi.h> #include <linux/errno.h> #include <linux/irq.h> #include <linux/init.h> #include <linux/input.h> #include <linux/interrupt.h> #include <linux/kernel.h> #include <linux/mfd/axp20x.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/regmap.h> #include <linux/slab.h> #define AXP20X_PEK_STARTUP_MASK (0xc0) #define AXP20X_PEK_SHUTDOWN_MASK (0x03) struct axp20x_pek { struct axp20x_dev *axp20x; struct input_dev *input; int irq_dbr; int irq_dbf; }; struct axp20x_time { unsigned int time; unsigned int idx; }; static const struct axp20x_time startup_time[] = { { .time = 128, .idx = 0 }, { .time = 1000, .idx = 2 }, { .time = 3000, .idx = 1 }, { .time = 2000, .idx = 3 }, }; static const struct axp20x_time shutdown_time[] = { { .time = 4000, .idx = 0 }, { .time = 6000, .idx = 1 }, { .time = 8000, .idx = 2 }, { .time = 10000, .idx = 3 }, }; struct axp20x_pek_ext_attr { const struct axp20x_time *p_time; unsigned int mask; }; static struct axp20x_pek_ext_attr axp20x_pek_startup_ext_attr = { .p_time = startup_time, .mask = AXP20X_PEK_STARTUP_MASK, }; static struct axp20x_pek_ext_attr axp20x_pek_shutdown_ext_attr = { .p_time = shutdown_time, .mask = AXP20X_PEK_SHUTDOWN_MASK, }; static struct axp20x_pek_ext_attr *get_axp_ext_attr(struct device_attribute *attr) { return container_of(attr, struct dev_ext_attribute, attr)->var; } static ssize_t axp20x_show_ext_attr(struct device *dev, struct device_attribute *attr, char *buf) { struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev); struct axp20x_pek_ext_attr *axp20x_ea = get_axp_ext_attr(attr); unsigned int val; int ret, i; ret = regmap_read(axp20x_pek->axp20x->regmap, AXP20X_PEK_KEY, &val); if (ret != 0) return ret; val &= axp20x_ea->mask; val >>= ffs(axp20x_ea->mask) - 1; for (i = 0; i < 4; i++) if (val == axp20x_ea->p_time[i].idx) val = axp20x_ea->p_time[i].time; return sprintf(buf, "%u\n", val); } static ssize_t axp20x_store_ext_attr(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev); struct axp20x_pek_ext_attr *axp20x_ea = get_axp_ext_attr(attr); char val_str[20]; size_t len; int ret, i; unsigned int val, idx = 0; unsigned int best_err = UINT_MAX; val_str[sizeof(val_str) - 1] = '\0'; strncpy(val_str, buf, sizeof(val_str) - 1); len = strlen(val_str); if (len && val_str[len - 1] == '\n') val_str[len - 1] = '\0'; ret = kstrtouint(val_str, 10, &val); if (ret) return ret; for (i = 3; i >= 0; i--) { unsigned int err; err = abs(axp20x_ea->p_time[i].time - val); if (err < best_err) { best_err = err; idx = axp20x_ea->p_time[i].idx; } if (!err) break; } idx <<= ffs(axp20x_ea->mask) - 1; ret = regmap_update_bits(axp20x_pek->axp20x->regmap, AXP20X_PEK_KEY, axp20x_ea->mask, idx); if (ret != 0) return -EINVAL; return count; } static struct dev_ext_attribute axp20x_dev_attr_startup = { .attr = __ATTR(startup, 0644, axp20x_show_ext_attr, axp20x_store_ext_attr), .var = &axp20x_pek_startup_ext_attr, }; static struct dev_ext_attribute axp20x_dev_attr_shutdown = { .attr = __ATTR(shutdown, 0644, axp20x_show_ext_attr, axp20x_store_ext_attr), .var = &axp20x_pek_shutdown_ext_attr, }; static struct attribute *axp20x_attributes[] = { &axp20x_dev_attr_startup.attr.attr, &axp20x_dev_attr_shutdown.attr.attr, NULL, }; static const struct attribute_group axp20x_attribute_group = { .attrs = axp20x_attributes, }; static irqreturn_t axp20x_pek_irq(int irq, void *pwr) { struct input_dev *idev = pwr; struct axp20x_pek *axp20x_pek = input_get_drvdata(idev); /* * The power-button is connected to ground so a falling edge (dbf) * means it is pressed. */ if (irq == axp20x_pek->irq_dbf) input_report_key(idev, KEY_POWER, true); else if (irq == axp20x_pek->irq_dbr) input_report_key(idev, KEY_POWER, false); input_sync(idev); return IRQ_HANDLED; } static void axp20x_remove_sysfs_group(void *_data) { struct device *dev = _data; sysfs_remove_group(&dev->kobj, &axp20x_attribute_group); } static int axp20x_pek_probe_input_device(struct axp20x_pek *axp20x_pek, struct platform_device *pdev) { struct axp20x_dev *axp20x = axp20x_pek->axp20x; struct input_dev *idev; int error; axp20x_pek->irq_dbr = platform_get_irq_byname(pdev, "PEK_DBR"); if (axp20x_pek->irq_dbr < 0) { dev_err(&pdev->dev, "No IRQ for PEK_DBR, error=%d\n", axp20x_pek->irq_dbr); return axp20x_pek->irq_dbr; } axp20x_pek->irq_dbr = regmap_irq_get_virq(axp20x->regmap_irqc, axp20x_pek->irq_dbr); axp20x_pek->irq_dbf = platform_get_irq_byname(pdev, "PEK_DBF"); if (axp20x_pek->irq_dbf < 0) { dev_err(&pdev->dev, "No IRQ for PEK_DBF, error=%d\n", axp20x_pek->irq_dbf); return axp20x_pek->irq_dbf; } axp20x_pek->irq_dbf = regmap_irq_get_virq(axp20x->regmap_irqc, axp20x_pek->irq_dbf); axp20x_pek->input = devm_input_allocate_device(&pdev->dev); if (!axp20x_pek->input) return -ENOMEM; idev = axp20x_pek->input; idev->name = "axp20x-pek"; idev->phys = "m1kbd/input2"; idev->dev.parent = &pdev->dev; input_set_capability(idev, EV_KEY, KEY_POWER); input_set_drvdata(idev, axp20x_pek); error = devm_request_any_context_irq(&pdev->dev, axp20x_pek->irq_dbr, axp20x_pek_irq, 0, "axp20x-pek-dbr", idev); if (error < 0) { dev_err(&pdev->dev, "Failed to request dbr IRQ#%d: %d\n", axp20x_pek->irq_dbr, error); return error; } error = devm_request_any_context_irq(&pdev->dev, axp20x_pek->irq_dbf, axp20x_pek_irq, 0, "axp20x-pek-dbf", idev); if (error < 0) { dev_err(&pdev->dev, "Failed to request dbf IRQ#%d: %d\n", axp20x_pek->irq_dbf, error); return error; } error = input_register_device(idev); if (error) { dev_err(&pdev->dev, "Can't register input device: %d\n", error); return error; } return 0; } #ifdef CONFIG_ACPI static bool axp20x_pek_should_register_input(struct axp20x_pek *axp20x_pek, struct platform_device *pdev) { unsigned long long hrv = 0; acpi_status status; if (IS_ENABLED(CONFIG_INPUT_SOC_BUTTON_ARRAY) && axp20x_pek->axp20x->variant == AXP288_ID) { status = acpi_evaluate_integer(ACPI_HANDLE(pdev->dev.parent), "_HRV", NULL, &hrv); if (ACPI_FAILURE(status)) dev_err(&pdev->dev, "Failed to get PMIC hardware revision\n"); /* * On Cherry Trail platforms (hrv == 3), do not register the * input device if there is an "INTCFD9" or "ACPI0011" gpio * button ACPI device, as that handles the power button too, * and otherwise we end up reporting all presses twice. */ if (hrv == 3 && (acpi_dev_present("INTCFD9", NULL, -1) || acpi_dev_present("ACPI0011", NULL, -1))) return false; } return true; } #else static bool axp20x_pek_should_register_input(struct axp20x_pek *axp20x_pek, struct platform_device *pdev) { return true; } #endif static int axp20x_pek_probe(struct platform_device *pdev) { struct axp20x_pek *axp20x_pek; int error; axp20x_pek = devm_kzalloc(&pdev->dev, sizeof(struct axp20x_pek), GFP_KERNEL); if (!axp20x_pek) return -ENOMEM; axp20x_pek->axp20x = dev_get_drvdata(pdev->dev.parent); if (axp20x_pek_should_register_input(axp20x_pek, pdev)) { error = axp20x_pek_probe_input_device(axp20x_pek, pdev); if (error) return error; } error = sysfs_create_group(&pdev->dev.kobj, &axp20x_attribute_group); if (error) { dev_err(&pdev->dev, "Failed to create sysfs attributes: %d\n", error); return error; } error = devm_add_action(&pdev->dev, axp20x_remove_sysfs_group, &pdev->dev); if (error) { axp20x_remove_sysfs_group(&pdev->dev); dev_err(&pdev->dev, "Failed to add sysfs cleanup action: %d\n", error); return error; } platform_set_drvdata(pdev, axp20x_pek); return 0; } static struct platform_driver axp20x_pek_driver = { .probe = axp20x_pek_probe, .driver = { .name = "axp20x-pek", }, }; module_platform_driver(axp20x_pek_driver); MODULE_DESCRIPTION("axp20x Power Button"); MODULE_AUTHOR("Carlo Caione <carlo@caione.org>"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:axp20x-pek");