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207 lines
5.4 KiB
207 lines
5.4 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Power key driver for SiRF PrimaII |
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* |
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* Copyright (c) 2013 - 2014 Cambridge Silicon Radio Limited, a CSR plc group |
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* company. |
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*/ |
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#include <linux/module.h> |
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#include <linux/interrupt.h> |
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#include <linux/delay.h> |
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#include <linux/platform_device.h> |
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#include <linux/input.h> |
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#include <linux/rtc/sirfsoc_rtciobrg.h> |
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#include <linux/of.h> |
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#include <linux/workqueue.h> |
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struct sirfsoc_pwrc_drvdata { |
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u32 pwrc_base; |
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struct input_dev *input; |
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struct delayed_work work; |
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}; |
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#define PWRC_ON_KEY_BIT (1 << 0) |
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#define PWRC_INT_STATUS 0xc |
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#define PWRC_INT_MASK 0x10 |
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#define PWRC_PIN_STATUS 0x14 |
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#define PWRC_KEY_DETECT_UP_TIME 20 /* ms*/ |
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static int sirfsoc_pwrc_is_on_key_down(struct sirfsoc_pwrc_drvdata *pwrcdrv) |
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{ |
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u32 state = sirfsoc_rtc_iobrg_readl(pwrcdrv->pwrc_base + |
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PWRC_PIN_STATUS); |
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return !(state & PWRC_ON_KEY_BIT); /* ON_KEY is active low */ |
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} |
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static void sirfsoc_pwrc_report_event(struct work_struct *work) |
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{ |
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struct sirfsoc_pwrc_drvdata *pwrcdrv = |
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container_of(work, struct sirfsoc_pwrc_drvdata, work.work); |
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if (sirfsoc_pwrc_is_on_key_down(pwrcdrv)) { |
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schedule_delayed_work(&pwrcdrv->work, |
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msecs_to_jiffies(PWRC_KEY_DETECT_UP_TIME)); |
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} else { |
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input_event(pwrcdrv->input, EV_KEY, KEY_POWER, 0); |
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input_sync(pwrcdrv->input); |
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} |
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} |
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static irqreturn_t sirfsoc_pwrc_isr(int irq, void *dev_id) |
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{ |
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struct sirfsoc_pwrc_drvdata *pwrcdrv = dev_id; |
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u32 int_status; |
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int_status = sirfsoc_rtc_iobrg_readl(pwrcdrv->pwrc_base + |
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PWRC_INT_STATUS); |
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sirfsoc_rtc_iobrg_writel(int_status & ~PWRC_ON_KEY_BIT, |
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pwrcdrv->pwrc_base + PWRC_INT_STATUS); |
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input_event(pwrcdrv->input, EV_KEY, KEY_POWER, 1); |
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input_sync(pwrcdrv->input); |
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schedule_delayed_work(&pwrcdrv->work, |
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msecs_to_jiffies(PWRC_KEY_DETECT_UP_TIME)); |
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return IRQ_HANDLED; |
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} |
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static void sirfsoc_pwrc_toggle_interrupts(struct sirfsoc_pwrc_drvdata *pwrcdrv, |
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bool enable) |
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{ |
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u32 int_mask; |
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int_mask = sirfsoc_rtc_iobrg_readl(pwrcdrv->pwrc_base + PWRC_INT_MASK); |
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if (enable) |
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int_mask |= PWRC_ON_KEY_BIT; |
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else |
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int_mask &= ~PWRC_ON_KEY_BIT; |
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sirfsoc_rtc_iobrg_writel(int_mask, pwrcdrv->pwrc_base + PWRC_INT_MASK); |
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} |
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static int sirfsoc_pwrc_open(struct input_dev *input) |
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{ |
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struct sirfsoc_pwrc_drvdata *pwrcdrv = input_get_drvdata(input); |
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sirfsoc_pwrc_toggle_interrupts(pwrcdrv, true); |
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return 0; |
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} |
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static void sirfsoc_pwrc_close(struct input_dev *input) |
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{ |
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struct sirfsoc_pwrc_drvdata *pwrcdrv = input_get_drvdata(input); |
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sirfsoc_pwrc_toggle_interrupts(pwrcdrv, false); |
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cancel_delayed_work_sync(&pwrcdrv->work); |
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} |
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static const struct of_device_id sirfsoc_pwrc_of_match[] = { |
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{ .compatible = "sirf,prima2-pwrc" }, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(of, sirfsoc_pwrc_of_match); |
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static int sirfsoc_pwrc_probe(struct platform_device *pdev) |
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{ |
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struct device_node *np = pdev->dev.of_node; |
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struct sirfsoc_pwrc_drvdata *pwrcdrv; |
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int irq; |
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int error; |
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pwrcdrv = devm_kzalloc(&pdev->dev, sizeof(struct sirfsoc_pwrc_drvdata), |
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GFP_KERNEL); |
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if (!pwrcdrv) { |
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dev_info(&pdev->dev, "Not enough memory for the device data\n"); |
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return -ENOMEM; |
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} |
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/* |
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* We can't use of_iomap because pwrc is not mapped in memory, |
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* the so-called base address is only offset in rtciobrg |
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*/ |
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error = of_property_read_u32(np, "reg", &pwrcdrv->pwrc_base); |
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if (error) { |
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dev_err(&pdev->dev, |
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"unable to find base address of pwrc node in dtb\n"); |
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return error; |
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} |
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pwrcdrv->input = devm_input_allocate_device(&pdev->dev); |
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if (!pwrcdrv->input) |
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return -ENOMEM; |
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pwrcdrv->input->name = "sirfsoc pwrckey"; |
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pwrcdrv->input->phys = "pwrc/input0"; |
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pwrcdrv->input->evbit[0] = BIT_MASK(EV_KEY); |
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input_set_capability(pwrcdrv->input, EV_KEY, KEY_POWER); |
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INIT_DELAYED_WORK(&pwrcdrv->work, sirfsoc_pwrc_report_event); |
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pwrcdrv->input->open = sirfsoc_pwrc_open; |
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pwrcdrv->input->close = sirfsoc_pwrc_close; |
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input_set_drvdata(pwrcdrv->input, pwrcdrv); |
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/* Make sure the device is quiesced */ |
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sirfsoc_pwrc_toggle_interrupts(pwrcdrv, false); |
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irq = platform_get_irq(pdev, 0); |
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error = devm_request_irq(&pdev->dev, irq, |
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sirfsoc_pwrc_isr, 0, |
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"sirfsoc_pwrc_int", pwrcdrv); |
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if (error) { |
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dev_err(&pdev->dev, "unable to claim irq %d, error: %d\n", |
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irq, error); |
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return error; |
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} |
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error = input_register_device(pwrcdrv->input); |
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if (error) { |
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dev_err(&pdev->dev, |
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"unable to register input device, error: %d\n", |
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error); |
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return error; |
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} |
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dev_set_drvdata(&pdev->dev, pwrcdrv); |
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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 __maybe_unused sirfsoc_pwrc_resume(struct device *dev) |
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{ |
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struct sirfsoc_pwrc_drvdata *pwrcdrv = dev_get_drvdata(dev); |
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struct input_dev *input = pwrcdrv->input; |
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/* |
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* Do not mask pwrc interrupt as we want pwrc work as a wakeup source |
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* if users touch X_ONKEY_B, see arch/arm/mach-prima2/pm.c |
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*/ |
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mutex_lock(&input->mutex); |
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if (input_device_enabled(input)) |
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sirfsoc_pwrc_toggle_interrupts(pwrcdrv, true); |
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mutex_unlock(&input->mutex); |
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return 0; |
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} |
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static SIMPLE_DEV_PM_OPS(sirfsoc_pwrc_pm_ops, NULL, sirfsoc_pwrc_resume); |
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static struct platform_driver sirfsoc_pwrc_driver = { |
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.probe = sirfsoc_pwrc_probe, |
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.driver = { |
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.name = "sirfsoc-pwrc", |
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.pm = &sirfsoc_pwrc_pm_ops, |
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.of_match_table = sirfsoc_pwrc_of_match, |
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} |
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}; |
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module_platform_driver(sirfsoc_pwrc_driver); |
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MODULE_LICENSE("GPL v2"); |
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MODULE_AUTHOR("Binghua Duan <[email protected]>, Xianglong Du <[email protected]>"); |
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MODULE_DESCRIPTION("CSR Prima2 PWRC Driver"); |
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MODULE_ALIAS("platform:sirfsoc-pwrc");
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