295 lines
7.1 KiB
C
295 lines
7.1 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/interrupt.h>
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#include <linux/io.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 <linux/slab.h>
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#include <linux/platform_data/bfin_rotary.h>
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#include <asm/portmux.h>
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#define CNT_CONFIG_OFF 0 /* CNT Config Offset */
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#define CNT_IMASK_OFF 4 /* CNT Interrupt Mask Offset */
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#define CNT_STATUS_OFF 8 /* CNT Status Offset */
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#define CNT_COMMAND_OFF 12 /* CNT Command Offset */
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#define CNT_DEBOUNCE_OFF 16 /* CNT Debounce Offset */
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#define CNT_COUNTER_OFF 20 /* CNT Counter Offset */
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#define CNT_MAX_OFF 24 /* CNT Maximum Count Offset */
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#define CNT_MIN_OFF 28 /* CNT Minimum Count Offset */
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struct bfin_rot {
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struct input_dev *input;
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void __iomem *base;
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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 mode;
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unsigned short debounce;
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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 bfin_rot *rotary = dev_id;
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int delta;
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switch (readw(rotary->base + CNT_STATUS_OFF)) {
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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 = readl(rotary->base + CNT_COUNTER_OFF);
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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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writew(W1LCNT_ZERO, rotary->base + CNT_COMMAND_OFF); /* Clear COUNTER */
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writew(-1, rotary->base + CNT_STATUS_OFF); /* Clear STATUS */
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return IRQ_HANDLED;
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}
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static int bfin_rotary_open(struct input_dev *input)
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{
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struct bfin_rot *rotary = input_get_drvdata(input);
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unsigned short val;
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if (rotary->mode & ROT_DEBE)
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writew(rotary->debounce & DPRESCALE,
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rotary->base + CNT_DEBOUNCE_OFF);
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writew(rotary->mode & ~CNTE, rotary->base + CNT_CONFIG_OFF);
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val = UCIE | DCIE;
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if (rotary->button_key)
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val |= CZMIE;
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writew(val, rotary->base + CNT_IMASK_OFF);
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writew(rotary->mode | CNTE, rotary->base + CNT_CONFIG_OFF);
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return 0;
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}
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static void bfin_rotary_close(struct input_dev *input)
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{
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struct bfin_rot *rotary = input_get_drvdata(input);
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writew(0, rotary->base + CNT_CONFIG_OFF);
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writew(0, rotary->base + CNT_IMASK_OFF);
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}
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static void bfin_rotary_free_action(void *data)
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{
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peripheral_free_list(data);
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}
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static int bfin_rotary_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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const struct bfin_rotary_platform_data *pdata = dev_get_platdata(dev);
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struct bfin_rot *rotary;
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struct resource *res;
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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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if (pdata->pin_list) {
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error = peripheral_request_list(pdata->pin_list,
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dev_name(dev));
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if (error) {
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dev_err(dev, "requesting peripherals failed: %d\n",
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error);
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return error;
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}
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error = devm_add_action_or_reset(dev, bfin_rotary_free_action,
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pdata->pin_list);
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if (error) {
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dev_err(dev, "setting cleanup action failed: %d\n",
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error);
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return error;
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}
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}
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rotary = devm_kzalloc(dev, sizeof(struct bfin_rot), GFP_KERNEL);
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if (!rotary)
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return -ENOMEM;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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rotary->base = devm_ioremap_resource(dev, res);
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if (IS_ERR(rotary->base))
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return PTR_ERR(rotary->base);
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input = devm_input_allocate_device(dev);
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if (!input)
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return -ENOMEM;
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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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rotary->mode = pdata->mode;
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rotary->debounce = pdata->debounce;
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input->name = pdev->name;
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input->phys = "bfin-rotary/input0";
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input->dev.parent = 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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input->open = bfin_rotary_open;
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input->close = bfin_rotary_close;
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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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/* Quiesce the device before requesting irq */
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bfin_rotary_close(input);
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rotary->irq = platform_get_irq(pdev, 0);
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if (rotary->irq < 0) {
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dev_err(dev, "No rotary IRQ specified\n");
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return -ENOENT;
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}
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error = devm_request_irq(dev, rotary->irq, bfin_rotary_isr,
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0, dev_name(dev), rotary);
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if (error) {
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dev_err(dev, "unable to claim irq %d; error %d\n",
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rotary->irq, error);
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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) {
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dev_err(dev, "unable to register input device (%d)\n", error);
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return error;
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}
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platform_set_drvdata(pdev, rotary);
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device_init_wakeup(dev, 1);
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return 0;
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}
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static int __maybe_unused 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 = readw(rotary->base + CNT_CONFIG_OFF);
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rotary->cnt_imask = readw(rotary->base + CNT_IMASK_OFF);
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rotary->cnt_debounce = readw(rotary->base + CNT_DEBOUNCE_OFF);
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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 __maybe_unused 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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writew(rotary->cnt_debounce, rotary->base + CNT_DEBOUNCE_OFF);
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writew(rotary->cnt_imask, rotary->base + CNT_IMASK_OFF);
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writew(rotary->cnt_config & ~CNTE, rotary->base + CNT_CONFIG_OFF);
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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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writew(rotary->cnt_config, rotary->base + CNT_CONFIG_OFF);
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return 0;
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}
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static SIMPLE_DEV_PM_OPS(bfin_rotary_pm_ops,
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bfin_rotary_suspend, bfin_rotary_resume);
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static struct platform_driver bfin_rotary_device_driver = {
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.probe = bfin_rotary_probe,
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.driver = {
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.name = "bfin-rotary",
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.pm = &bfin_rotary_pm_ops,
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},
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};
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module_platform_driver(bfin_rotary_device_driver);
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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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