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path: root/drivers/input/misc/bfin_rotary.c
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Diffstat (limited to 'drivers/input/misc/bfin_rotary.c')
-rw-r--r--drivers/input/misc/bfin_rotary.c295
1 files changed, 295 insertions, 0 deletions
diff --git a/drivers/input/misc/bfin_rotary.c b/drivers/input/misc/bfin_rotary.c
new file mode 100644
index 000000000..a0fc18fdf
--- /dev/null
+++ b/drivers/input/misc/bfin_rotary.c
@@ -0,0 +1,295 @@
+/*
+ * 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/interrupt.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/pm.h>
+#include <linux/platform_device.h>
+#include <linux/input.h>
+#include <linux/slab.h>
+#include <linux/platform_data/bfin_rotary.h>
+
+#include <asm/portmux.h>
+
+#define CNT_CONFIG_OFF 0 /* CNT Config Offset */
+#define CNT_IMASK_OFF 4 /* CNT Interrupt Mask Offset */
+#define CNT_STATUS_OFF 8 /* CNT Status Offset */
+#define CNT_COMMAND_OFF 12 /* CNT Command Offset */
+#define CNT_DEBOUNCE_OFF 16 /* CNT Debounce Offset */
+#define CNT_COUNTER_OFF 20 /* CNT Counter Offset */
+#define CNT_MAX_OFF 24 /* CNT Maximum Count Offset */
+#define CNT_MIN_OFF 28 /* CNT Minimum Count Offset */
+
+struct bfin_rot {
+ struct input_dev *input;
+ void __iomem *base;
+ int irq;
+ unsigned int up_key;
+ unsigned int down_key;
+ unsigned int button_key;
+ unsigned int rel_code;
+
+ unsigned short mode;
+ unsigned short debounce;
+
+ 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 bfin_rot *rotary = dev_id;
+ int delta;
+
+ switch (readw(rotary->base + CNT_STATUS_OFF)) {
+
+ case ICII:
+ break;
+
+ case UCII:
+ case DCII:
+ delta = readl(rotary->base + CNT_COUNTER_OFF);
+ if (delta)
+ report_rotary_event(rotary, delta);
+ break;
+
+ case CZMII:
+ report_key_event(rotary->input, rotary->button_key);
+ break;
+
+ default:
+ break;
+ }
+
+ writew(W1LCNT_ZERO, rotary->base + CNT_COMMAND_OFF); /* Clear COUNTER */
+ writew(-1, rotary->base + CNT_STATUS_OFF); /* Clear STATUS */
+
+ return IRQ_HANDLED;
+}
+
+static int bfin_rotary_open(struct input_dev *input)
+{
+ struct bfin_rot *rotary = input_get_drvdata(input);
+ unsigned short val;
+
+ if (rotary->mode & ROT_DEBE)
+ writew(rotary->debounce & DPRESCALE,
+ rotary->base + CNT_DEBOUNCE_OFF);
+
+ writew(rotary->mode & ~CNTE, rotary->base + CNT_CONFIG_OFF);
+
+ val = UCIE | DCIE;
+ if (rotary->button_key)
+ val |= CZMIE;
+ writew(val, rotary->base + CNT_IMASK_OFF);
+
+ writew(rotary->mode | CNTE, rotary->base + CNT_CONFIG_OFF);
+
+ return 0;
+}
+
+static void bfin_rotary_close(struct input_dev *input)
+{
+ struct bfin_rot *rotary = input_get_drvdata(input);
+
+ writew(0, rotary->base + CNT_CONFIG_OFF);
+ writew(0, rotary->base + CNT_IMASK_OFF);
+}
+
+static void bfin_rotary_free_action(void *data)
+{
+ peripheral_free_list(data);
+}
+
+static int bfin_rotary_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ const struct bfin_rotary_platform_data *pdata = dev_get_platdata(dev);
+ struct bfin_rot *rotary;
+ struct resource *res;
+ 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;
+ }
+
+ if (pdata->pin_list) {
+ error = peripheral_request_list(pdata->pin_list,
+ dev_name(&pdev->dev));
+ if (error) {
+ dev_err(dev, "requesting peripherals failed: %d\n",
+ error);
+ return error;
+ }
+
+ error = devm_add_action(dev, bfin_rotary_free_action,
+ pdata->pin_list);
+ if (error) {
+ dev_err(dev, "setting cleanup action failed: %d\n",
+ error);
+ peripheral_free_list(pdata->pin_list);
+ return error;
+ }
+ }
+
+ rotary = devm_kzalloc(dev, sizeof(struct bfin_rot), GFP_KERNEL);
+ if (!rotary)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ rotary->base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(rotary->base))
+ return PTR_ERR(rotary->base);
+
+ input = devm_input_allocate_device(dev);
+ if (!input)
+ return -ENOMEM;
+
+ 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;
+
+ rotary->mode = pdata->mode;
+ rotary->debounce = pdata->debounce;
+
+ 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;
+
+ input->open = bfin_rotary_open;
+ input->close = bfin_rotary_close;
+
+ 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);
+ }
+
+ /* Quiesce the device before requesting irq */
+ bfin_rotary_close(input);
+
+ rotary->irq = platform_get_irq(pdev, 0);
+ if (rotary->irq < 0) {
+ dev_err(dev, "No rotary IRQ specified\n");
+ return -ENOENT;
+ }
+
+ error = devm_request_irq(dev, rotary->irq, bfin_rotary_isr,
+ 0, dev_name(dev), rotary);
+ if (error) {
+ dev_err(dev, "unable to claim irq %d; error %d\n",
+ rotary->irq, error);
+ return error;
+ }
+
+ error = input_register_device(input);
+ if (error) {
+ dev_err(dev, "unable to register input device (%d)\n", error);
+ return error;
+ }
+
+ platform_set_drvdata(pdev, rotary);
+ device_init_wakeup(&pdev->dev, 1);
+
+ return 0;
+}
+
+static int __maybe_unused 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 = readw(rotary->base + CNT_CONFIG_OFF);
+ rotary->cnt_imask = readw(rotary->base + CNT_IMASK_OFF);
+ rotary->cnt_debounce = readw(rotary->base + CNT_DEBOUNCE_OFF);
+
+ if (device_may_wakeup(&pdev->dev))
+ enable_irq_wake(rotary->irq);
+
+ return 0;
+}
+
+static int __maybe_unused bfin_rotary_resume(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct bfin_rot *rotary = platform_get_drvdata(pdev);
+
+ writew(rotary->cnt_debounce, rotary->base + CNT_DEBOUNCE_OFF);
+ writew(rotary->cnt_imask, rotary->base + CNT_IMASK_OFF);
+ writew(rotary->cnt_config & ~CNTE, rotary->base + CNT_CONFIG_OFF);
+
+ if (device_may_wakeup(&pdev->dev))
+ disable_irq_wake(rotary->irq);
+
+ if (rotary->cnt_config & CNTE)
+ writew(rotary->cnt_config, rotary->base + CNT_CONFIG_OFF);
+
+ return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(bfin_rotary_pm_ops,
+ bfin_rotary_suspend, bfin_rotary_resume);
+
+static struct platform_driver bfin_rotary_device_driver = {
+ .probe = bfin_rotary_probe,
+ .driver = {
+ .name = "bfin-rotary",
+ .pm = &bfin_rotary_pm_ops,
+ },
+};
+module_platform_driver(bfin_rotary_device_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
+MODULE_DESCRIPTION("Rotary Counter driver for Blackfin Processors");
+MODULE_ALIAS("platform:bfin-rotary");
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-07-04 14:20:46 +0000