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