Input: add Blackfin rotary input driver

This driver handles the Blackfin on-chip rotary peripheral.

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

3 files changed, 294 insertions, 0 deletions

diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index 1acfa3a05aad..cbe21bc96b52 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -269,4 +269,14 @@ config INPUT_DM355EVM
 
           To compile this driver as a module, choose M here: the
           module will be called dm355evm_keys.
+
+config INPUT_BFIN_ROTARY
+        tristate "Blackfin Rotary support"
+        depends on BF54x || BF52x
+        help
+          Say Y here if you want to use the Blackfin Rotary.
+
+          To compile this driver as a module, choose M here: the
+          module will be called bfin-rotary.
+
 endif
diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index 0d979fd4cd57..79c1e9a5ea31 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -8,6 +8,7 @@ obj-$(CONFIG_INPUT_APANEL)		+= apanel.o
 obj-$(CONFIG_INPUT_ATI_REMOTE)          += ati_remote.o
 obj-$(CONFIG_INPUT_ATI_REMOTE2)         += ati_remote2.o
 obj-$(CONFIG_INPUT_ATLAS_BTNS)          += atlas_btns.o
+obj-$(CONFIG_INPUT_BFIN_ROTARY)         += bfin_rotary.o
 obj-$(CONFIG_INPUT_CM109)               += cm109.o
 obj-$(CONFIG_INPUT_COBALT_BTNS)         += cobalt_btns.o
 obj-$(CONFIG_INPUT_DM355EVM)            += dm355evm_keys.o
diff --git a/drivers/input/misc/bfin_rotary.c b/drivers/input/misc/bfin_rotary.c
new file mode 100644
index 000000000000..690f3fafa03b
--- /dev/null
+++ b/drivers/input/misc/bfin_rotary.c
@@ -0,0 +1,283 @@
+/*
+ * 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");