443 lines
11 KiB
C
443 lines
11 KiB
C
/*
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* axp20x power button driver.
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*
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* Copyright (C) 2013 Carlo Caione <carlo@caione.org>
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*
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* This file is subject to the terms and conditions of the GNU General
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* Public License. See the file "COPYING" in the main directory of this
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* archive for more details.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/acpi.h>
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#include <linux/errno.h>
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#include <linux/irq.h>
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#include <linux/init.h>
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#include <linux/input.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/mfd/axp20x.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/slab.h>
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#define AXP20X_PEK_STARTUP_MASK (0xc0)
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#define AXP20X_PEK_SHUTDOWN_MASK (0x03)
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struct axp20x_info {
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const struct axp20x_time *startup_time;
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unsigned int startup_mask;
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const struct axp20x_time *shutdown_time;
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unsigned int shutdown_mask;
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};
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struct axp20x_pek {
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struct axp20x_dev *axp20x;
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struct input_dev *input;
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struct axp20x_info *info;
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int irq_dbr;
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int irq_dbf;
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};
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struct axp20x_time {
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unsigned int time;
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unsigned int idx;
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};
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static const struct axp20x_time startup_time[] = {
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{ .time = 128, .idx = 0 },
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{ .time = 1000, .idx = 2 },
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{ .time = 3000, .idx = 1 },
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{ .time = 2000, .idx = 3 },
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};
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static const struct axp20x_time axp221_startup_time[] = {
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{ .time = 128, .idx = 0 },
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{ .time = 1000, .idx = 1 },
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{ .time = 2000, .idx = 2 },
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{ .time = 3000, .idx = 3 },
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};
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static const struct axp20x_time shutdown_time[] = {
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{ .time = 4000, .idx = 0 },
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{ .time = 6000, .idx = 1 },
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{ .time = 8000, .idx = 2 },
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{ .time = 10000, .idx = 3 },
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};
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static const struct axp20x_info axp20x_info = {
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.startup_time = startup_time,
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.startup_mask = AXP20X_PEK_STARTUP_MASK,
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.shutdown_time = shutdown_time,
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.shutdown_mask = AXP20X_PEK_SHUTDOWN_MASK,
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};
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static const struct axp20x_info axp221_info = {
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.startup_time = axp221_startup_time,
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.startup_mask = AXP20X_PEK_STARTUP_MASK,
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.shutdown_time = shutdown_time,
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.shutdown_mask = AXP20X_PEK_SHUTDOWN_MASK,
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};
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static ssize_t axp20x_show_attr(struct device *dev,
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const struct axp20x_time *time,
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unsigned int mask, char *buf)
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{
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struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
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unsigned int val;
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int ret, i;
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ret = regmap_read(axp20x_pek->axp20x->regmap, AXP20X_PEK_KEY, &val);
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if (ret != 0)
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return ret;
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val &= mask;
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val >>= ffs(mask) - 1;
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for (i = 0; i < 4; i++)
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if (val == time[i].idx)
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val = time[i].time;
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return sprintf(buf, "%u\n", val);
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}
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static ssize_t axp20x_show_attr_startup(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
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return axp20x_show_attr(dev, axp20x_pek->info->startup_time,
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axp20x_pek->info->startup_mask, buf);
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}
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static ssize_t axp20x_show_attr_shutdown(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
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return axp20x_show_attr(dev, axp20x_pek->info->shutdown_time,
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axp20x_pek->info->shutdown_mask, buf);
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}
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static ssize_t axp20x_store_attr(struct device *dev,
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const struct axp20x_time *time,
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unsigned int mask, const char *buf,
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size_t count)
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{
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struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
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char val_str[20];
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size_t len;
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int ret, i;
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unsigned int val, idx = 0;
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unsigned int best_err = UINT_MAX;
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val_str[sizeof(val_str) - 1] = '\0';
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strncpy(val_str, buf, sizeof(val_str) - 1);
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len = strlen(val_str);
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if (len && val_str[len - 1] == '\n')
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val_str[len - 1] = '\0';
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ret = kstrtouint(val_str, 10, &val);
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if (ret)
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return ret;
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for (i = 3; i >= 0; i--) {
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unsigned int err;
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err = abs(time[i].time - val);
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if (err < best_err) {
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best_err = err;
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idx = time[i].idx;
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}
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if (!err)
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break;
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}
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idx <<= ffs(mask) - 1;
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ret = regmap_update_bits(axp20x_pek->axp20x->regmap, AXP20X_PEK_KEY,
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mask, idx);
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if (ret != 0)
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return -EINVAL;
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return count;
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}
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static ssize_t axp20x_store_attr_startup(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
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return axp20x_store_attr(dev, axp20x_pek->info->startup_time,
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axp20x_pek->info->startup_mask, buf, count);
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}
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static ssize_t axp20x_store_attr_shutdown(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
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return axp20x_store_attr(dev, axp20x_pek->info->shutdown_time,
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axp20x_pek->info->shutdown_mask, buf, count);
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}
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static DEVICE_ATTR(startup, 0644, axp20x_show_attr_startup,
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axp20x_store_attr_startup);
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static DEVICE_ATTR(shutdown, 0644, axp20x_show_attr_shutdown,
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axp20x_store_attr_shutdown);
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static struct attribute *axp20x_attrs[] = {
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&dev_attr_startup.attr,
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&dev_attr_shutdown.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(axp20x);
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static irqreturn_t axp20x_pek_irq(int irq, void *pwr)
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{
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struct axp20x_pek *axp20x_pek = pwr;
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struct input_dev *idev = axp20x_pek->input;
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if (!idev)
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return IRQ_HANDLED;
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/*
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* The power-button is connected to ground so a falling edge (dbf)
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* means it is pressed.
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*/
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if (irq == axp20x_pek->irq_dbf)
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input_report_key(idev, KEY_POWER, true);
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else if (irq == axp20x_pek->irq_dbr)
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input_report_key(idev, KEY_POWER, false);
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input_sync(idev);
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return IRQ_HANDLED;
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}
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static int axp20x_pek_probe_input_device(struct axp20x_pek *axp20x_pek,
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struct platform_device *pdev)
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{
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struct input_dev *idev;
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int error;
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axp20x_pek->input = devm_input_allocate_device(&pdev->dev);
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if (!axp20x_pek->input)
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return -ENOMEM;
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idev = axp20x_pek->input;
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idev->name = "axp20x-pek";
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idev->phys = "m1kbd/input2";
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idev->dev.parent = &pdev->dev;
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input_set_capability(idev, EV_KEY, KEY_POWER);
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input_set_drvdata(idev, axp20x_pek);
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error = input_register_device(idev);
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if (error) {
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dev_err(&pdev->dev, "Can't register input device: %d\n",
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error);
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return error;
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}
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return 0;
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}
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#ifdef CONFIG_ACPI
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static bool axp20x_pek_should_register_input(struct axp20x_pek *axp20x_pek,
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struct platform_device *pdev)
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{
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unsigned long long hrv = 0;
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acpi_status status;
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if (IS_ENABLED(CONFIG_INPUT_SOC_BUTTON_ARRAY) &&
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axp20x_pek->axp20x->variant == AXP288_ID) {
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status = acpi_evaluate_integer(ACPI_HANDLE(pdev->dev.parent),
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"_HRV", NULL, &hrv);
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if (ACPI_FAILURE(status))
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dev_err(&pdev->dev, "Failed to get PMIC hardware revision\n");
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/*
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* On Cherry Trail platforms (hrv == 3), do not register the
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* input device if there is an "INTCFD9" or "ACPI0011" gpio
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* button ACPI device, as that handles the power button too,
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* and otherwise we end up reporting all presses twice.
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*/
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if (hrv == 3 && (acpi_dev_present("INTCFD9", NULL, -1) ||
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acpi_dev_present("ACPI0011", NULL, -1)))
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return false;
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}
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return true;
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}
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#else
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static bool axp20x_pek_should_register_input(struct axp20x_pek *axp20x_pek,
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struct platform_device *pdev)
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{
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return true;
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}
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#endif
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static int axp20x_pek_probe(struct platform_device *pdev)
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{
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struct axp20x_pek *axp20x_pek;
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const struct platform_device_id *match = platform_get_device_id(pdev);
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int error;
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if (!match) {
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dev_err(&pdev->dev, "Failed to get platform_device_id\n");
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return -EINVAL;
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}
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axp20x_pek = devm_kzalloc(&pdev->dev, sizeof(struct axp20x_pek),
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GFP_KERNEL);
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if (!axp20x_pek)
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return -ENOMEM;
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axp20x_pek->axp20x = dev_get_drvdata(pdev->dev.parent);
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axp20x_pek->irq_dbr = platform_get_irq_byname(pdev, "PEK_DBR");
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if (axp20x_pek->irq_dbr < 0)
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return axp20x_pek->irq_dbr;
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axp20x_pek->irq_dbr = regmap_irq_get_virq(
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axp20x_pek->axp20x->regmap_irqc, axp20x_pek->irq_dbr);
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axp20x_pek->irq_dbf = platform_get_irq_byname(pdev, "PEK_DBF");
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if (axp20x_pek->irq_dbf < 0)
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return axp20x_pek->irq_dbf;
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axp20x_pek->irq_dbf = regmap_irq_get_virq(
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axp20x_pek->axp20x->regmap_irqc, axp20x_pek->irq_dbf);
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if (axp20x_pek_should_register_input(axp20x_pek, pdev)) {
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error = axp20x_pek_probe_input_device(axp20x_pek, pdev);
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if (error)
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return error;
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}
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axp20x_pek->info = (struct axp20x_info *)match->driver_data;
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error = devm_request_any_context_irq(&pdev->dev, axp20x_pek->irq_dbr,
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axp20x_pek_irq, 0,
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"axp20x-pek-dbr", axp20x_pek);
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if (error < 0) {
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dev_err(&pdev->dev, "Failed to request dbr IRQ#%d: %d\n",
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axp20x_pek->irq_dbr, error);
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return error;
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}
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error = devm_request_any_context_irq(&pdev->dev, axp20x_pek->irq_dbf,
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axp20x_pek_irq, 0,
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"axp20x-pek-dbf", axp20x_pek);
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if (error < 0) {
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dev_err(&pdev->dev, "Failed to request dbf IRQ#%d: %d\n",
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axp20x_pek->irq_dbf, error);
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return error;
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}
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device_init_wakeup(&pdev->dev, true);
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platform_set_drvdata(pdev, axp20x_pek);
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return 0;
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}
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static int __maybe_unused axp20x_pek_suspend(struct device *dev)
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{
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struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
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/*
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* As nested threaded IRQs are not automatically disabled during
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* suspend, we must explicitly disable non-wakeup IRQs.
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*/
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if (device_may_wakeup(dev)) {
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enable_irq_wake(axp20x_pek->irq_dbf);
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enable_irq_wake(axp20x_pek->irq_dbr);
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} else {
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disable_irq(axp20x_pek->irq_dbf);
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disable_irq(axp20x_pek->irq_dbr);
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}
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return 0;
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}
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static int __maybe_unused axp20x_pek_resume(struct device *dev)
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{
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struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
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if (device_may_wakeup(dev)) {
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disable_irq_wake(axp20x_pek->irq_dbf);
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disable_irq_wake(axp20x_pek->irq_dbr);
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} else {
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enable_irq(axp20x_pek->irq_dbf);
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enable_irq(axp20x_pek->irq_dbr);
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}
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return 0;
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}
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static int __maybe_unused axp20x_pek_resume_noirq(struct device *dev)
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{
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struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
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if (axp20x_pek->axp20x->variant != AXP288_ID)
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return 0;
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/*
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* Clear interrupts from button presses during suspend, to avoid
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* a wakeup power-button press getting reported to userspace.
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*/
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regmap_write(axp20x_pek->axp20x->regmap,
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AXP20X_IRQ1_STATE + AXP288_IRQ_POKN / 8,
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BIT(AXP288_IRQ_POKN % 8));
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return 0;
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}
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static const struct dev_pm_ops axp20x_pek_pm_ops = {
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SET_SYSTEM_SLEEP_PM_OPS(axp20x_pek_suspend, axp20x_pek_resume)
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#ifdef CONFIG_PM_SLEEP
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.resume_noirq = axp20x_pek_resume_noirq,
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#endif
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};
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static const struct platform_device_id axp_pek_id_match[] = {
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{
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.name = "axp20x-pek",
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.driver_data = (kernel_ulong_t)&axp20x_info,
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},
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{
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.name = "axp221-pek",
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.driver_data = (kernel_ulong_t)&axp221_info,
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},
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(platform, axp_pek_id_match);
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static struct platform_driver axp20x_pek_driver = {
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.probe = axp20x_pek_probe,
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.id_table = axp_pek_id_match,
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.driver = {
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.name = "axp20x-pek",
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.pm = &axp20x_pek_pm_ops,
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.dev_groups = axp20x_groups,
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},
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};
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module_platform_driver(axp20x_pek_driver);
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MODULE_DESCRIPTION("axp20x Power Button");
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MODULE_AUTHOR("Carlo Caione <carlo@caione.org>");
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MODULE_LICENSE("GPL");
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