337 lines
8.3 KiB
C
337 lines
8.3 KiB
C
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/*
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* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
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* Copyright (c) 2014, Sony Mobile Communications Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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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/delay.h>
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#include <linux/errno.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/log2.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/reboot.h>
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#include <linux/regmap.h>
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#define PON_REV2 0x01
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#define PON_RT_STS 0x10
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#define PON_KPDPWR_N_SET BIT(0)
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#define PON_RESIN_N_SET BIT(1)
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#define PON_PS_HOLD_RST_CTL 0x5a
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#define PON_PS_HOLD_RST_CTL2 0x5b
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#define PON_PS_HOLD_ENABLE BIT(7)
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#define PON_PS_HOLD_TYPE_MASK 0x0f
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#define PON_PS_HOLD_TYPE_SHUTDOWN 4
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#define PON_PS_HOLD_TYPE_HARD_RESET 7
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#define PON_PULL_CTL 0x70
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#define PON_KPDPWR_PULL_UP BIT(1)
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#define PON_RESIN_PULL_UP BIT(0)
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#define PON_DBC_CTL 0x71
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#define PON_DBC_DELAY_MASK 0x7
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struct pm8941_data {
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unsigned int pull_up_bit;
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unsigned int status_bit;
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};
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struct pm8941_pwrkey {
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struct device *dev;
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int irq;
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u32 baseaddr;
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struct regmap *regmap;
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struct input_dev *input;
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unsigned int revision;
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struct notifier_block reboot_notifier;
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u32 code;
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const struct pm8941_data *data;
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};
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static int pm8941_reboot_notify(struct notifier_block *nb,
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unsigned long code, void *unused)
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{
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struct pm8941_pwrkey *pwrkey = container_of(nb, struct pm8941_pwrkey,
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reboot_notifier);
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unsigned int enable_reg;
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unsigned int reset_type;
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int error;
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/* PMICs with revision 0 have the enable bit in same register as ctrl */
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if (pwrkey->revision == 0)
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enable_reg = PON_PS_HOLD_RST_CTL;
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else
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enable_reg = PON_PS_HOLD_RST_CTL2;
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error = regmap_update_bits(pwrkey->regmap,
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pwrkey->baseaddr + enable_reg,
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PON_PS_HOLD_ENABLE,
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0);
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if (error)
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dev_err(pwrkey->dev,
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"unable to clear ps hold reset enable: %d\n",
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error);
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/*
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* Updates of PON_PS_HOLD_ENABLE requires 3 sleep cycles between
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* writes.
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*/
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usleep_range(100, 1000);
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switch (code) {
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case SYS_HALT:
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case SYS_POWER_OFF:
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reset_type = PON_PS_HOLD_TYPE_SHUTDOWN;
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break;
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case SYS_RESTART:
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default:
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reset_type = PON_PS_HOLD_TYPE_HARD_RESET;
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break;
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}
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error = regmap_update_bits(pwrkey->regmap,
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pwrkey->baseaddr + PON_PS_HOLD_RST_CTL,
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PON_PS_HOLD_TYPE_MASK,
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reset_type);
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if (error)
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dev_err(pwrkey->dev, "unable to set ps hold reset type: %d\n",
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error);
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error = regmap_update_bits(pwrkey->regmap,
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pwrkey->baseaddr + enable_reg,
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PON_PS_HOLD_ENABLE,
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PON_PS_HOLD_ENABLE);
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if (error)
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dev_err(pwrkey->dev, "unable to re-set enable: %d\n", error);
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return NOTIFY_DONE;
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}
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static irqreturn_t pm8941_pwrkey_irq(int irq, void *_data)
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{
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struct pm8941_pwrkey *pwrkey = _data;
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unsigned int sts;
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int error;
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error = regmap_read(pwrkey->regmap,
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pwrkey->baseaddr + PON_RT_STS, &sts);
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if (error)
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return IRQ_HANDLED;
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input_report_key(pwrkey->input, pwrkey->code,
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sts & pwrkey->data->status_bit);
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input_sync(pwrkey->input);
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return IRQ_HANDLED;
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}
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static int __maybe_unused pm8941_pwrkey_suspend(struct device *dev)
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{
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struct pm8941_pwrkey *pwrkey = dev_get_drvdata(dev);
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if (device_may_wakeup(dev))
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enable_irq_wake(pwrkey->irq);
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return 0;
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}
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static int __maybe_unused pm8941_pwrkey_resume(struct device *dev)
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{
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struct pm8941_pwrkey *pwrkey = dev_get_drvdata(dev);
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if (device_may_wakeup(dev))
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disable_irq_wake(pwrkey->irq);
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return 0;
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}
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static SIMPLE_DEV_PM_OPS(pm8941_pwr_key_pm_ops,
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pm8941_pwrkey_suspend, pm8941_pwrkey_resume);
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static int pm8941_pwrkey_probe(struct platform_device *pdev)
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{
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struct pm8941_pwrkey *pwrkey;
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bool pull_up;
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struct device *parent;
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u32 req_delay;
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int error;
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if (of_property_read_u32(pdev->dev.of_node, "debounce", &req_delay))
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req_delay = 15625;
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if (req_delay > 2000000 || req_delay == 0) {
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dev_err(&pdev->dev, "invalid debounce time: %u\n", req_delay);
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return -EINVAL;
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}
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pull_up = of_property_read_bool(pdev->dev.of_node, "bias-pull-up");
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pwrkey = devm_kzalloc(&pdev->dev, sizeof(*pwrkey), GFP_KERNEL);
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if (!pwrkey)
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return -ENOMEM;
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pwrkey->dev = &pdev->dev;
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pwrkey->data = of_device_get_match_data(&pdev->dev);
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parent = pdev->dev.parent;
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pwrkey->regmap = dev_get_regmap(parent, NULL);
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if (!pwrkey->regmap) {
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/*
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* We failed to get regmap for parent. Let's see if we are
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* a child of pon node and read regmap and reg from its
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* parent.
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*/
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pwrkey->regmap = dev_get_regmap(parent->parent, NULL);
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if (!pwrkey->regmap) {
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dev_err(&pdev->dev, "failed to locate regmap\n");
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return -ENODEV;
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}
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error = of_property_read_u32(parent->of_node,
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"reg", &pwrkey->baseaddr);
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} else {
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error = of_property_read_u32(pdev->dev.of_node, "reg",
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&pwrkey->baseaddr);
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}
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if (error)
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return error;
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pwrkey->irq = platform_get_irq(pdev, 0);
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if (pwrkey->irq < 0) {
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dev_err(&pdev->dev, "failed to get irq\n");
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return pwrkey->irq;
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}
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error = regmap_read(pwrkey->regmap, pwrkey->baseaddr + PON_REV2,
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&pwrkey->revision);
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if (error) {
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dev_err(&pdev->dev, "failed to set debounce: %d\n", error);
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return error;
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}
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error = of_property_read_u32(pdev->dev.of_node, "linux,code",
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&pwrkey->code);
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if (error) {
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dev_dbg(&pdev->dev,
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"no linux,code assuming power (%d)\n", error);
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pwrkey->code = KEY_POWER;
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}
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pwrkey->input = devm_input_allocate_device(&pdev->dev);
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if (!pwrkey->input) {
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dev_dbg(&pdev->dev, "unable to allocate input device\n");
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return -ENOMEM;
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}
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input_set_capability(pwrkey->input, EV_KEY, pwrkey->code);
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pwrkey->input->name = "pm8941_pwrkey";
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pwrkey->input->phys = "pm8941_pwrkey/input0";
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req_delay = (req_delay << 6) / USEC_PER_SEC;
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req_delay = ilog2(req_delay);
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error = regmap_update_bits(pwrkey->regmap,
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pwrkey->baseaddr + PON_DBC_CTL,
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PON_DBC_DELAY_MASK,
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req_delay);
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if (error) {
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dev_err(&pdev->dev, "failed to set debounce: %d\n", error);
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return error;
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}
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error = regmap_update_bits(pwrkey->regmap,
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pwrkey->baseaddr + PON_PULL_CTL,
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pwrkey->data->pull_up_bit,
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pull_up ? pwrkey->data->pull_up_bit : 0);
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if (error) {
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dev_err(&pdev->dev, "failed to set pull: %d\n", error);
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return error;
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}
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error = devm_request_threaded_irq(&pdev->dev, pwrkey->irq,
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NULL, pm8941_pwrkey_irq,
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IRQF_ONESHOT,
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"pm8941_pwrkey", pwrkey);
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if (error) {
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dev_err(&pdev->dev, "failed requesting IRQ: %d\n", error);
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return error;
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}
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error = input_register_device(pwrkey->input);
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if (error) {
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dev_err(&pdev->dev, "failed to register input device: %d\n",
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error);
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return error;
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}
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pwrkey->reboot_notifier.notifier_call = pm8941_reboot_notify,
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error = register_reboot_notifier(&pwrkey->reboot_notifier);
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if (error) {
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dev_err(&pdev->dev, "failed to register reboot notifier: %d\n",
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error);
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return error;
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}
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platform_set_drvdata(pdev, pwrkey);
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device_init_wakeup(&pdev->dev, 1);
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return 0;
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}
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static int pm8941_pwrkey_remove(struct platform_device *pdev)
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{
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struct pm8941_pwrkey *pwrkey = platform_get_drvdata(pdev);
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unregister_reboot_notifier(&pwrkey->reboot_notifier);
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return 0;
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}
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static const struct pm8941_data pwrkey_data = {
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.pull_up_bit = PON_KPDPWR_PULL_UP,
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.status_bit = PON_KPDPWR_N_SET,
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};
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static const struct pm8941_data resin_data = {
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.pull_up_bit = PON_RESIN_PULL_UP,
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.status_bit = PON_RESIN_N_SET,
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};
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static const struct of_device_id pm8941_pwr_key_id_table[] = {
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{ .compatible = "qcom,pm8941-pwrkey", .data = &pwrkey_data },
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{ .compatible = "qcom,pm8941-resin", .data = &resin_data },
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{ }
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};
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MODULE_DEVICE_TABLE(of, pm8941_pwr_key_id_table);
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static struct platform_driver pm8941_pwrkey_driver = {
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.probe = pm8941_pwrkey_probe,
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.remove = pm8941_pwrkey_remove,
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.driver = {
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.name = "pm8941-pwrkey",
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.pm = &pm8941_pwr_key_pm_ops,
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.of_match_table = of_match_ptr(pm8941_pwr_key_id_table),
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},
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};
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module_platform_driver(pm8941_pwrkey_driver);
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MODULE_DESCRIPTION("PM8941 Power Key driver");
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MODULE_LICENSE("GPL v2");
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