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326 lines
7.8 KiB
326 lines
7.8 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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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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#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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return pwrkey->irq; |
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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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