| /* |
| * Driver for the IMX SNVS ON/OFF Power Key |
| * Copyright (C) 2015 Freescale Semiconductor, Inc. All Rights Reserved. |
| * |
| * The code contained herein is licensed under the GNU General Public |
| * License. You may obtain a copy of the GNU General Public License |
| * Version 2 or later at the following locations: |
| * |
| * http://www.opensource.org/licenses/gpl-license.html |
| * http://www.gnu.org/copyleft/gpl.html |
| */ |
| |
| #include <linux/device.h> |
| #include <linux/err.h> |
| #include <linux/init.h> |
| #include <linux/input.h> |
| #include <linux/interrupt.h> |
| #include <linux/io.h> |
| #include <linux/jiffies.h> |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/of.h> |
| #include <linux/of_address.h> |
| #include <linux/platform_device.h> |
| #include <linux/mfd/syscon.h> |
| #include <linux/regmap.h> |
| |
| #define SNVS_LPSR_REG 0x4C /* LP Status Register */ |
| #define SNVS_LPCR_REG 0x38 /* LP Control Register */ |
| #define SNVS_HPSR_REG 0x14 |
| #define SNVS_HPSR_BTN BIT(6) |
| #define SNVS_LPSR_SPO BIT(18) |
| #define SNVS_LPCR_DEP_EN BIT(5) |
| |
| #define DEBOUNCE_TIME 30 |
| #define REPEAT_INTERVAL 60 |
| |
| struct pwrkey_drv_data { |
| struct regmap *snvs; |
| int irq; |
| int keycode; |
| int keystate; /* 1:pressed */ |
| int wakeup; |
| struct timer_list check_timer; |
| struct input_dev *input; |
| }; |
| |
| static void imx_imx_snvs_check_for_events(unsigned long data) |
| { |
| struct pwrkey_drv_data *pdata = (struct pwrkey_drv_data *) data; |
| struct input_dev *input = pdata->input; |
| u32 state; |
| |
| regmap_read(pdata->snvs, SNVS_HPSR_REG, &state); |
| state = state & SNVS_HPSR_BTN ? 1 : 0; |
| |
| /* only report new event if status changed */ |
| if (state ^ pdata->keystate) { |
| pdata->keystate = state; |
| input_event(input, EV_KEY, pdata->keycode, state); |
| input_sync(input); |
| pm_relax(pdata->input->dev.parent); |
| } |
| |
| /* repeat check if pressed long */ |
| if (state) { |
| mod_timer(&pdata->check_timer, |
| jiffies + msecs_to_jiffies(REPEAT_INTERVAL)); |
| } |
| } |
| |
| static irqreturn_t imx_snvs_pwrkey_interrupt(int irq, void *dev_id) |
| { |
| struct platform_device *pdev = dev_id; |
| struct pwrkey_drv_data *pdata = platform_get_drvdata(pdev); |
| u32 lp_status; |
| |
| pm_wakeup_event(pdata->input->dev.parent, 0); |
| |
| regmap_read(pdata->snvs, SNVS_LPSR_REG, &lp_status); |
| if (lp_status & SNVS_LPSR_SPO) |
| mod_timer(&pdata->check_timer, jiffies + msecs_to_jiffies(DEBOUNCE_TIME)); |
| |
| /* clear SPO status */ |
| regmap_write(pdata->snvs, SNVS_LPSR_REG, SNVS_LPSR_SPO); |
| |
| return IRQ_HANDLED; |
| } |
| |
| static void imx_snvs_pwrkey_act(void *pdata) |
| { |
| struct pwrkey_drv_data *pd = pdata; |
| |
| del_timer_sync(&pd->check_timer); |
| } |
| |
| static int imx_snvs_pwrkey_probe(struct platform_device *pdev) |
| { |
| struct pwrkey_drv_data *pdata = NULL; |
| struct input_dev *input = NULL; |
| struct device_node *np; |
| int error; |
| |
| /* Get SNVS register Page */ |
| np = pdev->dev.of_node; |
| if (!np) |
| return -ENODEV; |
| |
| pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); |
| if (!pdata) |
| return -ENOMEM; |
| |
| pdata->snvs = syscon_regmap_lookup_by_phandle(np, "regmap");; |
| |
| if (!pdata->snvs) { |
| dev_err(&pdev->dev, "Can't get snvs syscon\n"); |
| return -ENODEV; |
| } |
| |
| if (of_property_read_u32(np, "linux,keycode", &pdata->keycode)) { |
| pdata->keycode = KEY_POWER; |
| dev_warn(&pdev->dev, "KEY_POWER without setting in dts\n"); |
| } |
| |
| pdata->wakeup = of_property_read_bool(np, "wakeup-source"); |
| |
| pdata->irq = platform_get_irq(pdev, 0); |
| if (pdata->irq < 0) { |
| dev_err(&pdev->dev, "no irq defined in platform data\n"); |
| return -EINVAL; |
| } |
| |
| regmap_update_bits(pdata->snvs, SNVS_LPCR_REG, SNVS_LPCR_DEP_EN, SNVS_LPCR_DEP_EN); |
| |
| /* clear the unexpected interrupt before driver ready */ |
| regmap_write(pdata->snvs, SNVS_LPSR_REG, SNVS_LPSR_SPO); |
| |
| setup_timer(&pdata->check_timer, |
| imx_imx_snvs_check_for_events, (unsigned long) pdata); |
| |
| input = devm_input_allocate_device(&pdev->dev); |
| if (!input) { |
| dev_err(&pdev->dev, "failed to allocate the input device\n"); |
| return -ENOMEM; |
| } |
| |
| input->name = pdev->name; |
| input->phys = "snvs-pwrkey/input0"; |
| input->id.bustype = BUS_HOST; |
| |
| input_set_capability(input, EV_KEY, pdata->keycode); |
| |
| /* input customer action to cancel release timer */ |
| error = devm_add_action(&pdev->dev, imx_snvs_pwrkey_act, pdata); |
| if (error) { |
| dev_err(&pdev->dev, "failed to register remove action\n"); |
| return error; |
| } |
| |
| error = devm_request_irq(&pdev->dev, pdata->irq, |
| imx_snvs_pwrkey_interrupt, |
| 0, pdev->name, pdev); |
| |
| if (error) { |
| dev_err(&pdev->dev, "interrupt not available.\n"); |
| return error; |
| } |
| |
| error = input_register_device(input); |
| if (error < 0) { |
| dev_err(&pdev->dev, "failed to register input device\n"); |
| input_free_device(input); |
| return error; |
| } |
| |
| pdata->input = input; |
| platform_set_drvdata(pdev, pdata); |
| |
| device_init_wakeup(&pdev->dev, pdata->wakeup); |
| |
| return 0; |
| } |
| |
| static int imx_snvs_pwrkey_suspend(struct device *dev) |
| { |
| struct platform_device *pdev = to_platform_device(dev); |
| struct pwrkey_drv_data *pdata = platform_get_drvdata(pdev); |
| |
| if (device_may_wakeup(&pdev->dev)) |
| enable_irq_wake(pdata->irq); |
| |
| return 0; |
| } |
| |
| static int imx_snvs_pwrkey_resume(struct device *dev) |
| { |
| struct platform_device *pdev = to_platform_device(dev); |
| struct pwrkey_drv_data *pdata = platform_get_drvdata(pdev); |
| |
| if (device_may_wakeup(&pdev->dev)) |
| disable_irq_wake(pdata->irq); |
| |
| return 0; |
| } |
| |
| static const struct of_device_id imx_snvs_pwrkey_ids[] = { |
| { .compatible = "fsl,sec-v4.0-pwrkey" }, |
| { /* sentinel */ } |
| }; |
| MODULE_DEVICE_TABLE(of, imx_snvs_pwrkey_ids); |
| |
| static SIMPLE_DEV_PM_OPS(imx_snvs_pwrkey_pm_ops, imx_snvs_pwrkey_suspend, |
| imx_snvs_pwrkey_resume); |
| |
| static struct platform_driver imx_snvs_pwrkey_driver = { |
| .driver = { |
| .name = "snvs_pwrkey", |
| .pm = &imx_snvs_pwrkey_pm_ops, |
| .of_match_table = imx_snvs_pwrkey_ids, |
| }, |
| .probe = imx_snvs_pwrkey_probe, |
| }; |
| module_platform_driver(imx_snvs_pwrkey_driver); |
| |
| MODULE_AUTHOR("Freescale Semiconductor"); |
| MODULE_DESCRIPTION("i.MX snvs power key Driver"); |
| MODULE_LICENSE("GPL"); |