--- /dev/null
+/*
+ * Rotary counter driver for Analog Devices Blackfin Processors
+ *
+ * Copyright 2008-2009 Analog Devices Inc.
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <linux/module.h>
+#include <linux/version.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/pm.h>
+#include <linux/platform_device.h>
+#include <linux/input.h>
+
+#include <asm/portmux.h>
+#include <asm/bfin_rotary.h>
+
+static const u16 per_cnt[] = {
+ P_CNT_CUD,
+ P_CNT_CDG,
+ P_CNT_CZM,
+ 0
+};
+
+struct bfin_rot {
+ struct input_dev *input;
+ int irq;
+ unsigned int up_key;
+ unsigned int down_key;
+ unsigned int button_key;
+ unsigned int rel_code;
+ unsigned short cnt_config;
+ unsigned short cnt_imask;
+ unsigned short cnt_debounce;
+};
+
+static void report_key_event(struct input_dev *input, int keycode)
+{
+ /* simulate a press-n-release */
+ input_report_key(input, keycode, 1);
+ input_sync(input);
+ input_report_key(input, keycode, 0);
+ input_sync(input);
+}
+
+static void report_rotary_event(struct bfin_rot *rotary, int delta)
+{
+ struct input_dev *input = rotary->input;
+
+ if (rotary->up_key) {
+ report_key_event(input,
+ delta > 0 ? rotary->up_key : rotary->down_key);
+ } else {
+ input_report_rel(input, rotary->rel_code, delta);
+ input_sync(input);
+ }
+}
+
+static irqreturn_t bfin_rotary_isr(int irq, void *dev_id)
+{
+ struct platform_device *pdev = dev_id;
+ struct bfin_rot *rotary = platform_get_drvdata(pdev);
+ int delta;
+
+ switch (bfin_read_CNT_STATUS()) {
+
+ case ICII:
+ break;
+
+ case UCII:
+ case DCII:
+ delta = bfin_read_CNT_COUNTER();
+ if (delta)
+ report_rotary_event(rotary, delta);
+ break;
+
+ case CZMII:
+ report_key_event(rotary->input, rotary->button_key);
+ break;
+
+ default:
+ break;
+ }
+
+ bfin_write_CNT_COMMAND(W1LCNT_ZERO); /* Clear COUNTER */
+ bfin_write_CNT_STATUS(-1); /* Clear STATUS */
+
+ return IRQ_HANDLED;
+}
+
+static int __devinit bfin_rotary_probe(struct platform_device *pdev)
+{
+ struct bfin_rotary_platform_data *pdata = pdev->dev.platform_data;
+ struct bfin_rot *rotary;
+ struct input_dev *input;
+ int error;
+
+ /* Basic validation */
+ if ((pdata->rotary_up_key && !pdata->rotary_down_key) ||
+ (!pdata->rotary_up_key && pdata->rotary_down_key)) {
+ return -EINVAL;
+ }
+
+ error = peripheral_request_list(per_cnt, dev_name(&pdev->dev));
+ if (error) {
+ dev_err(&pdev->dev, "requesting peripherals failed\n");
+ return error;
+ }
+
+ rotary = kzalloc(sizeof(struct bfin_rot), GFP_KERNEL);
+ input = input_allocate_device();
+ if (!rotary || !input) {
+ error = -ENOMEM;
+ goto out1;
+ }
+
+ rotary->input = input;
+
+ rotary->up_key = pdata->rotary_up_key;
+ rotary->down_key = pdata->rotary_down_key;
+ rotary->button_key = pdata->rotary_button_key;
+ rotary->rel_code = pdata->rotary_rel_code;
+
+ error = rotary->irq = platform_get_irq(pdev, 0);
+ if (error < 0)
+ goto out1;
+
+ input->name = pdev->name;
+ input->phys = "bfin-rotary/input0";
+ input->dev.parent = &pdev->dev;
+
+ input_set_drvdata(input, rotary);
+
+ input->id.bustype = BUS_HOST;
+ input->id.vendor = 0x0001;
+ input->id.product = 0x0001;
+ input->id.version = 0x0100;
+
+ if (rotary->up_key) {
+ __set_bit(EV_KEY, input->evbit);
+ __set_bit(rotary->up_key, input->keybit);
+ __set_bit(rotary->down_key, input->keybit);
+ } else {
+ __set_bit(EV_REL, input->evbit);
+ __set_bit(rotary->rel_code, input->relbit);
+ }
+
+ if (rotary->button_key) {
+ __set_bit(EV_KEY, input->evbit);
+ __set_bit(rotary->button_key, input->keybit);
+ }
+
+ error = request_irq(rotary->irq, bfin_rotary_isr,
+ 0, dev_name(&pdev->dev), pdev);
+ if (error) {
+ dev_err(&pdev->dev,
+ "unable to claim irq %d; error %d\n",
+ rotary->irq, error);
+ goto out1;
+ }
+
+ error = input_register_device(input);
+ if (error) {
+ dev_err(&pdev->dev,
+ "unable to register input device (%d)\n", error);
+ goto out2;
+ }
+
+ if (pdata->rotary_button_key)
+ bfin_write_CNT_IMASK(CZMIE);
+
+ if (pdata->mode & ROT_DEBE)
+ bfin_write_CNT_DEBOUNCE(pdata->debounce & DPRESCALE);
+
+ if (pdata->mode)
+ bfin_write_CNT_CONFIG(bfin_read_CNT_CONFIG() |
+ (pdata->mode & ~CNTE));
+
+ bfin_write_CNT_IMASK(bfin_read_CNT_IMASK() | UCIE | DCIE);
+ bfin_write_CNT_CONFIG(bfin_read_CNT_CONFIG() | CNTE);
+
+ platform_set_drvdata(pdev, rotary);
+ device_init_wakeup(&pdev->dev, 1);
+
+ return 0;
+
+out2:
+ free_irq(rotary->irq, pdev);
+out1:
+ input_free_device(input);
+ kfree(rotary);
+ peripheral_free_list(per_cnt);
+
+ return error;
+}
+
+static int __devexit bfin_rotary_remove(struct platform_device *pdev)
+{
+ struct bfin_rot *rotary = platform_get_drvdata(pdev);
+
+ bfin_write_CNT_CONFIG(0);
+ bfin_write_CNT_IMASK(0);
+
+ free_irq(rotary->irq, pdev);
+ input_unregister_device(rotary->input);
+ peripheral_free_list(per_cnt);
+
+ kfree(rotary);
+ platform_set_drvdata(pdev, NULL);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static int bfin_rotary_suspend(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct bfin_rot *rotary = platform_get_drvdata(pdev);
+
+ rotary->cnt_config = bfin_read_CNT_CONFIG();
+ rotary->cnt_imask = bfin_read_CNT_IMASK();
+ rotary->cnt_debounce = bfin_read_CNT_DEBOUNCE();
+
+ if (device_may_wakeup(&pdev->dev))
+ enable_irq_wake(rotary->irq);
+
+ return 0;
+}
+
+static int bfin_rotary_resume(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct bfin_rot *rotary = platform_get_drvdata(pdev);
+
+ bfin_write_CNT_DEBOUNCE(rotary->cnt_debounce);
+ bfin_write_CNT_IMASK(rotary->cnt_imask);
+ bfin_write_CNT_CONFIG(rotary->cnt_config & ~CNTE);
+
+ if (device_may_wakeup(&pdev->dev))
+ disable_irq_wake(rotary->irq);
+
+ if (rotary->cnt_config & CNTE)
+ bfin_write_CNT_CONFIG(rotary->cnt_config);
+
+ return 0;
+}
+
+static struct dev_pm_ops bfin_rotary_pm_ops = {
+ .suspend = bfin_rotary_suspend,
+ .resume = bfin_rotary_resume,
+};
+#endif
+
+static struct platform_driver bfin_rotary_device_driver = {
+ .probe = bfin_rotary_probe,
+ .remove = __devexit_p(bfin_rotary_remove),
+ .driver = {
+ .name = "bfin-rotary",
+ .owner = THIS_MODULE,
+#ifdef CONFIG_PM
+ .pm = &bfin_rotary_pm_ops,
+#endif
+ },
+};
+
+static int __init bfin_rotary_init(void)
+{
+ return platform_driver_register(&bfin_rotary_device_driver);
+}
+module_init(bfin_rotary_init);
+
+static void __exit bfin_rotary_exit(void)
+{
+ platform_driver_unregister(&bfin_rotary_device_driver);
+}
+module_exit(bfin_rotary_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
+MODULE_DESCRIPTION("Rotary Counter driver for Blackfin Processors");
+MODULE_ALIAS("platform:bfin-rotary");
projects / users / hch / configfs.git / commitdiff