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215 lines
5.4 KiB
215 lines
5.4 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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// |
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// Driver for the IMX SNVS ON/OFF Power Key |
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// Copyright (C) 2015 Freescale Semiconductor, Inc. All Rights Reserved. |
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#include <linux/device.h> |
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#include <linux/err.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/io.h> |
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#include <linux/jiffies.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/of.h> |
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#include <linux/of_address.h> |
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#include <linux/platform_device.h> |
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#include <linux/pm_wakeirq.h> |
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#include <linux/mfd/syscon.h> |
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#include <linux/regmap.h> |
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#define SNVS_HPVIDR1_REG 0xF8 |
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#define SNVS_LPSR_REG 0x4C /* LP Status Register */ |
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#define SNVS_LPCR_REG 0x38 /* LP Control Register */ |
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#define SNVS_HPSR_REG 0x14 |
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#define SNVS_HPSR_BTN BIT(6) |
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#define SNVS_LPSR_SPO BIT(18) |
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#define SNVS_LPCR_DEP_EN BIT(5) |
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#define DEBOUNCE_TIME 30 |
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#define REPEAT_INTERVAL 60 |
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struct pwrkey_drv_data { |
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struct regmap *snvs; |
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int irq; |
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int keycode; |
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int keystate; /* 1:pressed */ |
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int wakeup; |
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struct timer_list check_timer; |
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struct input_dev *input; |
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u8 minor_rev; |
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}; |
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static void imx_imx_snvs_check_for_events(struct timer_list *t) |
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{ |
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struct pwrkey_drv_data *pdata = from_timer(pdata, t, check_timer); |
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struct input_dev *input = pdata->input; |
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u32 state; |
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regmap_read(pdata->snvs, SNVS_HPSR_REG, &state); |
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state = state & SNVS_HPSR_BTN ? 1 : 0; |
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/* only report new event if status changed */ |
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if (state ^ pdata->keystate) { |
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pdata->keystate = state; |
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input_event(input, EV_KEY, pdata->keycode, state); |
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input_sync(input); |
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pm_relax(pdata->input->dev.parent); |
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} |
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/* repeat check if pressed long */ |
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if (state) { |
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mod_timer(&pdata->check_timer, |
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jiffies + msecs_to_jiffies(REPEAT_INTERVAL)); |
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} |
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} |
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static irqreturn_t imx_snvs_pwrkey_interrupt(int irq, void *dev_id) |
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{ |
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struct platform_device *pdev = dev_id; |
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struct pwrkey_drv_data *pdata = platform_get_drvdata(pdev); |
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struct input_dev *input = pdata->input; |
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u32 lp_status; |
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pm_wakeup_event(input->dev.parent, 0); |
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regmap_read(pdata->snvs, SNVS_LPSR_REG, &lp_status); |
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if (lp_status & SNVS_LPSR_SPO) { |
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if (pdata->minor_rev == 0) { |
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/* |
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* The first generation i.MX6 SoCs only sends an |
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* interrupt on button release. To mimic power-key |
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* usage, we'll prepend a press event. |
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*/ |
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input_report_key(input, pdata->keycode, 1); |
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input_sync(input); |
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input_report_key(input, pdata->keycode, 0); |
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input_sync(input); |
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pm_relax(input->dev.parent); |
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} else { |
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mod_timer(&pdata->check_timer, |
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jiffies + msecs_to_jiffies(DEBOUNCE_TIME)); |
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} |
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} |
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/* clear SPO status */ |
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regmap_write(pdata->snvs, SNVS_LPSR_REG, SNVS_LPSR_SPO); |
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return IRQ_HANDLED; |
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} |
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static void imx_snvs_pwrkey_act(void *pdata) |
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{ |
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struct pwrkey_drv_data *pd = pdata; |
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del_timer_sync(&pd->check_timer); |
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} |
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static int imx_snvs_pwrkey_probe(struct platform_device *pdev) |
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{ |
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struct pwrkey_drv_data *pdata; |
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struct input_dev *input; |
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struct device_node *np; |
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int error; |
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u32 vid; |
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/* Get SNVS register Page */ |
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np = pdev->dev.of_node; |
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if (!np) |
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return -ENODEV; |
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pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); |
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if (!pdata) |
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return -ENOMEM; |
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pdata->snvs = syscon_regmap_lookup_by_phandle(np, "regmap"); |
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if (IS_ERR(pdata->snvs)) { |
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dev_err(&pdev->dev, "Can't get snvs syscon\n"); |
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return PTR_ERR(pdata->snvs); |
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} |
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if (of_property_read_u32(np, "linux,keycode", &pdata->keycode)) { |
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pdata->keycode = KEY_POWER; |
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dev_warn(&pdev->dev, "KEY_POWER without setting in dts\n"); |
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} |
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pdata->wakeup = of_property_read_bool(np, "wakeup-source"); |
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pdata->irq = platform_get_irq(pdev, 0); |
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if (pdata->irq < 0) |
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return -EINVAL; |
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regmap_read(pdata->snvs, SNVS_HPVIDR1_REG, &vid); |
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pdata->minor_rev = vid & 0xff; |
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regmap_update_bits(pdata->snvs, SNVS_LPCR_REG, SNVS_LPCR_DEP_EN, SNVS_LPCR_DEP_EN); |
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/* clear the unexpected interrupt before driver ready */ |
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regmap_write(pdata->snvs, SNVS_LPSR_REG, SNVS_LPSR_SPO); |
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timer_setup(&pdata->check_timer, imx_imx_snvs_check_for_events, 0); |
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input = devm_input_allocate_device(&pdev->dev); |
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if (!input) { |
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dev_err(&pdev->dev, "failed to allocate the input device\n"); |
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return -ENOMEM; |
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} |
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input->name = pdev->name; |
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input->phys = "snvs-pwrkey/input0"; |
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input->id.bustype = BUS_HOST; |
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input_set_capability(input, EV_KEY, pdata->keycode); |
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/* input customer action to cancel release timer */ |
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error = devm_add_action(&pdev->dev, imx_snvs_pwrkey_act, pdata); |
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if (error) { |
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dev_err(&pdev->dev, "failed to register remove action\n"); |
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return error; |
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} |
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pdata->input = input; |
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platform_set_drvdata(pdev, pdata); |
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error = devm_request_irq(&pdev->dev, pdata->irq, |
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imx_snvs_pwrkey_interrupt, |
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0, pdev->name, pdev); |
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if (error) { |
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dev_err(&pdev->dev, "interrupt not available.\n"); |
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return error; |
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} |
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error = input_register_device(input); |
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if (error < 0) { |
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dev_err(&pdev->dev, "failed to register input device\n"); |
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return error; |
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} |
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device_init_wakeup(&pdev->dev, pdata->wakeup); |
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error = dev_pm_set_wake_irq(&pdev->dev, pdata->irq); |
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if (error) |
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dev_err(&pdev->dev, "irq wake enable failed.\n"); |
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return 0; |
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} |
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static const struct of_device_id imx_snvs_pwrkey_ids[] = { |
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{ .compatible = "fsl,sec-v4.0-pwrkey" }, |
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{ /* sentinel */ } |
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}; |
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MODULE_DEVICE_TABLE(of, imx_snvs_pwrkey_ids); |
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static struct platform_driver imx_snvs_pwrkey_driver = { |
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.driver = { |
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.name = "snvs_pwrkey", |
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.of_match_table = imx_snvs_pwrkey_ids, |
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}, |
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.probe = imx_snvs_pwrkey_probe, |
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}; |
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module_platform_driver(imx_snvs_pwrkey_driver); |
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MODULE_AUTHOR("Freescale Semiconductor"); |
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MODULE_DESCRIPTION("i.MX snvs power key Driver"); |
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MODULE_LICENSE("GPL");
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