--- /dev/null
+/*
+ * Copyright (C) 2011-2014 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>
+
+#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 (0x1 << 6)
+#define SNVS_LPSR_SPO (0x1 << 18)
+#define SNVS_LPCR_DEP_EN (0x1 << 5)
+
+struct pwrkey_drv_data {
+ void __iomem *ioaddr;
+ 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;
+ void __iomem *ioaddr = pdata->ioaddr;
+ u32 state;
+
+ state = ((readl_relaxed(ioaddr + SNVS_HPSR_REG) & 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);
+ }
+
+ /* repeat check if pressed long */
+ if (state) {
+ mod_timer(&pdata->check_timer,
+ jiffies + msecs_to_jiffies(60));
+ }
+}
+
+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);
+ void __iomem *ioaddr = pdata->ioaddr;
+ u32 lp_status;
+
+ lp_status = readl_relaxed(ioaddr + SNVS_LPSR_REG);
+ if (lp_status & SNVS_LPSR_SPO)
+ mod_timer(&pdata->check_timer, jiffies + msecs_to_jiffies(2));
+
+ /* clear SPO status */
+ writel_relaxed(lp_status, ioaddr + SNVS_LPSR_REG);
+
+ return IRQ_HANDLED;
+}
+
+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;
+ void __iomem *ioaddr;
+ u32 lp_cr;
+ int ret = 0;
+
+ pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ return -ENOMEM;
+
+ /* Get SNVS register Page */
+ np = of_find_compatible_node(NULL, NULL, "fsl,imx6sx-snvs-pwrkey");
+ if (!np)
+ return -ENODEV;
+ pdata->ioaddr = of_iomap(np, 0);
+ if (IS_ERR(pdata->ioaddr))
+ return PTR_ERR(pdata->ioaddr);
+
+ if (of_property_read_u32(np, "fsl,keycode", &pdata->keycode)) {
+ pdata->keycode = KEY_POWER;
+ dev_warn(&pdev->dev, "KEY_POWER without setting in dts\n");
+ }
+
+ pdata->wakeup = !!of_get_property(np, "fsl,wakeup", NULL);
+
+ ioaddr = pdata->ioaddr;
+ pdata->irq = platform_get_irq(pdev, 0);
+ if (pdata->irq < 0) {
+ dev_err(&pdev->dev, "no irq defined in platform data\n");
+ return -EINVAL;
+ }
+
+ ioaddr = pdata->ioaddr;
+ lp_cr = readl_relaxed(ioaddr + SNVS_LPCR_REG);
+ lp_cr |= SNVS_LPCR_DEP_EN,
+ writel_relaxed(lp_cr, ioaddr + SNVS_LPCR_REG);
+
+ setup_timer(&pdata->check_timer,
+ imx_imx_snvs_check_for_events, (unsigned long) pdata);
+
+ if (pdata->irq >= 0) {
+ ret = devm_request_irq(&pdev->dev, pdata->irq,
+ imx_snvs_pwrkey_interrupt,
+ IRQF_TRIGGER_HIGH, pdev->name, pdev);
+ if (ret) {
+ dev_err(&pdev->dev, "interrupt not available.\n");
+ return ret;
+ }
+ }
+
+ 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->evbit[0] = BIT_MASK(EV_KEY);
+
+ input_set_capability(input, EV_KEY, pdata->keycode);
+
+ ret = input_register_device(input);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "failed to register input device\n");
+ input_free_device(input);
+ return ret;
+ }
+
+ pdata->input = input;
+ platform_set_drvdata(pdev, pdata);
+
+ device_init_wakeup(&pdev->dev, pdata->wakeup);
+
+ dev_info(&pdev->dev, "i.MX snvs powerkey probed\n");
+
+ return 0;
+}
+
+static int imx_snvs_pwrkey_remove(struct platform_device *pdev)
+{
+ struct pwrkey_drv_data *pdata = platform_get_drvdata(pdev);
+
+ input_unregister_device(pdata->input);
+ del_timer_sync(&pdata->check_timer);
+
+ 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,imx6sx-snvs-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",
+ .owner = THIS_MODULE,
+ .pm = &imx_snvs_pwrkey_pm_ops,
+ .of_match_table = imx_snvs_pwrkey_ids,
+ },
+ .probe = imx_snvs_pwrkey_probe,
+ .remove = imx_snvs_pwrkey_remove,
+};
+module_platform_driver(imx_snvs_pwrkey_driver);
+
+MODULE_AUTHOR("Freescale Semiconductor");
+MODULE_DESCRIPTION("i.MX snvs power key Driver");
+MODULE_LICENSE("GPL");
projects / karo-tx-linux.git / commitdiff