Input: add DaVinci Keypad Driver

This driver enables keypad support on DaVinci platforms. DM365 is the
only platform that uses this driver at the moment.

Signed-off-by: Miguel Aguilar <miguel.aguilar@ridgerun.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 337 insertions, 0 deletions

diff --git a/drivers/input/keyboard/davinci_keyscan.c b/drivers/input/keyboard/davinci_keyscan.c
new file mode 100644
index 000000000000..6e52d855f637
--- /dev/null
+++ b/drivers/input/keyboard/davinci_keyscan.c
@@ -0,0 +1,337 @@
+/*
+ * DaVinci Key Scan Driver for TI platforms
+ *
+ * Copyright (C) 2009 Texas Instruments, Inc
+ *
+ * Author: Miguel Aguilar <miguel.aguilar@ridgerun.com>
+ *
+ * Intial Code: Sandeep Paulraj <s-paulraj@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/types.h>
+#include <linux/input.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+#include <linux/errno.h>
+
+#include <asm/irq.h>
+
+#include <mach/hardware.h>
+#include <mach/irqs.h>
+#include <mach/keyscan.h>
+
+/* Key scan registers */
+#define DAVINCI_KEYSCAN_KEYCTRL         0x0000
+#define DAVINCI_KEYSCAN_INTENA          0x0004
+#define DAVINCI_KEYSCAN_INTFLAG         0x0008
+#define DAVINCI_KEYSCAN_INTCLR          0x000c
+#define DAVINCI_KEYSCAN_STRBWIDTH       0x0010
+#define DAVINCI_KEYSCAN_INTERVAL        0x0014
+#define DAVINCI_KEYSCAN_CONTTIME        0x0018
+#define DAVINCI_KEYSCAN_CURRENTST       0x001c
+#define DAVINCI_KEYSCAN_PREVSTATE       0x0020
+#define DAVINCI_KEYSCAN_EMUCTRL         0x0024
+#define DAVINCI_KEYSCAN_IODFTCTRL       0x002c
+
+/* Key Control Register (KEYCTRL) */
+#define DAVINCI_KEYSCAN_KEYEN           0x00000001
+#define DAVINCI_KEYSCAN_PREVMODE        0x00000002
+#define DAVINCI_KEYSCAN_CHATOFF         0x00000004
+#define DAVINCI_KEYSCAN_AUTODET         0x00000008
+#define DAVINCI_KEYSCAN_SCANMODE        0x00000010
+#define DAVINCI_KEYSCAN_OUTTYPE         0x00000020
+
+/* Masks for the interrupts */
+#define DAVINCI_KEYSCAN_INT_CONT        0x00000008
+#define DAVINCI_KEYSCAN_INT_OFF         0x00000004
+#define DAVINCI_KEYSCAN_INT_ON          0x00000002
+#define DAVINCI_KEYSCAN_INT_CHANGE      0x00000001
+#define DAVINCI_KEYSCAN_INT_ALL         0x0000000f
+
+struct davinci_ks {
+        struct input_dev                *input;
+        struct davinci_ks_platform_data *pdata;
+        int                             irq;
+        void __iomem                    *base;
+        resource_size_t                 pbase;
+        size_t                          base_size;
+        unsigned short                  keymap[];
+};
+
+/* Initializing the kp Module */
+static int __init davinci_ks_initialize(struct davinci_ks *davinci_ks)
+{
+        struct device *dev = &davinci_ks->input->dev;
+        struct davinci_ks_platform_data *pdata = davinci_ks->pdata;
+        u32 matrix_ctrl;
+
+        /* Enable all interrupts */
+        __raw_writel(DAVINCI_KEYSCAN_INT_ALL,
+                     davinci_ks->base + DAVINCI_KEYSCAN_INTENA);
+
+        /* Clear interrupts if any */
+        __raw_writel(DAVINCI_KEYSCAN_INT_ALL,
+                     davinci_ks->base + DAVINCI_KEYSCAN_INTCLR);
+
+        /* Setup the scan period = strobe + interval */
+        __raw_writel(pdata->strobe,
+                     davinci_ks->base + DAVINCI_KEYSCAN_STRBWIDTH);
+        __raw_writel(pdata->interval,
+                     davinci_ks->base + DAVINCI_KEYSCAN_INTERVAL);
+        __raw_writel(0x01,
+                     davinci_ks->base + DAVINCI_KEYSCAN_CONTTIME);
+
+        /* Define matrix type */
+        switch (pdata->matrix_type) {
+        case DAVINCI_KEYSCAN_MATRIX_4X4:
+                matrix_ctrl = 0;
+                break;
+        case DAVINCI_KEYSCAN_MATRIX_5X3:
+                matrix_ctrl = (1 << 6);
+                break;
+        default:
+                dev_err(dev->parent, "wrong matrix type\n");
+                return -EINVAL;
+        }
+
+        /* Enable key scan module and set matrix type */
+        __raw_writel(DAVINCI_KEYSCAN_AUTODET | DAVINCI_KEYSCAN_KEYEN |
+                     matrix_ctrl, davinci_ks->base + DAVINCI_KEYSCAN_KEYCTRL);
+
+        return 0;
+}
+
+static irqreturn_t davinci_ks_interrupt(int irq, void *dev_id)
+{
+        struct davinci_ks *davinci_ks = dev_id;
+        struct device *dev = &davinci_ks->input->dev;
+        unsigned short *keymap = davinci_ks->keymap;
+        int keymapsize = davinci_ks->pdata->keymapsize;
+        u32 prev_status, new_status, changed;
+        bool release;
+        int keycode = KEY_UNKNOWN;
+        int i;
+
+        /* Disable interrupt */
+        __raw_writel(0x0, davinci_ks->base + DAVINCI_KEYSCAN_INTENA);
+
+        /* Reading previous and new status of the key scan */
+        prev_status = __raw_readl(davinci_ks->base + DAVINCI_KEYSCAN_PREVSTATE);
+        new_status = __raw_readl(davinci_ks->base + DAVINCI_KEYSCAN_CURRENTST);
+
+        changed = prev_status ^ new_status;
+
+        if (changed) {
+                /*
+                 * It goes through all bits in 'changed' to ensure
+                 * that no key changes are being missed
+                 */
+                for (i = 0 ; i < keymapsize; i++) {
+                        if ((changed>>i) & 0x1) {
+                                keycode = keymap[i];
+                                release = (new_status >> i) & 0x1;
+                                dev_dbg(dev->parent, "key %d %s\n", keycode,
+                                        release ? "released" : "pressed");
+                                input_report_key(davinci_ks->input, keycode,
+                                                 !release);
+                                input_sync(davinci_ks->input);
+                        }
+                }
+                /* Clearing interrupt */
+                __raw_writel(DAVINCI_KEYSCAN_INT_ALL,
+                             davinci_ks->base + DAVINCI_KEYSCAN_INTCLR);
+        }
+
+        /* Enable interrupts */
+        __raw_writel(0x1, davinci_ks->base + DAVINCI_KEYSCAN_INTENA);
+
+        return IRQ_HANDLED;
+}
+
+static int __init davinci_ks_probe(struct platform_device *pdev)
+{
+        struct davinci_ks *davinci_ks;
+        struct input_dev *key_dev;
+        struct resource *res, *mem;
+        struct device *dev = &pdev->dev;
+        struct davinci_ks_platform_data *pdata = pdev->dev.platform_data;
+        int error, i;
+
+        if (!pdata->keymap) {
+                dev_dbg(dev, "no keymap from pdata\n");
+                return -EINVAL;
+        }
+
+        davinci_ks = kzalloc(sizeof(struct davinci_ks) +
+                sizeof(unsigned short) * pdata->keymapsize, GFP_KERNEL);
+        if (!davinci_ks) {
+                dev_dbg(dev, "could not allocate memory for private data\n");
+                return -ENOMEM;
+        }
+
+        memcpy(davinci_ks->keymap, pdata->keymap,
+                sizeof(unsigned short) * pdata->keymapsize);
+
+        key_dev = input_allocate_device();
+        if (!key_dev) {
+                dev_dbg(dev, "could not allocate input device\n");
+                error = -ENOMEM;
+                goto fail1;
+        }
+
+        davinci_ks->input = key_dev;
+
+        davinci_ks->irq = platform_get_irq(pdev, 0);
+        if (davinci_ks->irq < 0) {
+                dev_err(dev, "no key scan irq\n");
+                error = davinci_ks->irq;
+                goto fail2;
+        }
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!res) {
+                dev_err(dev, "no mem resource\n");
+                error = -EINVAL;
+                goto fail2;
+        }
+
+        davinci_ks->pbase = res->start;
+        davinci_ks->base_size = resource_size(res);
+
+        mem = request_mem_region(davinci_ks->pbase, davinci_ks->base_size,
+                                 pdev->name);
+        if (!mem) {
+                dev_err(dev, "key scan registers at %08x are not free\n",
+                        davinci_ks->pbase);
+                error = -EBUSY;
+                goto fail2;
+        }
+
+        davinci_ks->base = ioremap(davinci_ks->pbase, davinci_ks->base_size);
+        if (!davinci_ks->base) {
+                dev_err(dev, "can't ioremap MEM resource.\n");
+                error = -ENOMEM;
+                goto fail3;
+        }
+
+        /* Enable auto repeat feature of Linux input subsystem */
+        if (pdata->rep)
+                __set_bit(EV_REP, key_dev->evbit);
+
+        /* Setup input device */
+        __set_bit(EV_KEY, key_dev->evbit);
+
+        /* Setup the platform data */
+        davinci_ks->pdata = pdata;
+
+        for (i = 0; i < davinci_ks->pdata->keymapsize; i++)
+                __set_bit(davinci_ks->pdata->keymap[i], key_dev->keybit);
+
+        key_dev->name = "davinci_keyscan";
+        key_dev->phys = "davinci_keyscan/input0";
+        key_dev->dev.parent = &pdev->dev;
+        key_dev->id.bustype = BUS_HOST;
+        key_dev->id.vendor = 0x0001;
+        key_dev->id.product = 0x0001;
+        key_dev->id.version = 0x0001;
+        key_dev->keycode = davinci_ks->keymap;
+        key_dev->keycodesize = sizeof(davinci_ks->keymap[0]);
+        key_dev->keycodemax = davinci_ks->pdata->keymapsize;
+
+        error = input_register_device(davinci_ks->input);
+        if (error < 0) {
+                dev_err(dev, "unable to register davinci key scan device\n");
+                goto fail4;
+        }
+
+        error = request_irq(davinci_ks->irq, davinci_ks_interrupt,
+                          IRQF_DISABLED, pdev->name, davinci_ks);
+        if (error < 0) {
+                dev_err(dev, "unable to register davinci key scan interrupt\n");
+                goto fail5;
+        }
+
+        error = davinci_ks_initialize(davinci_ks);
+        if (error < 0) {
+                dev_err(dev, "unable to initialize davinci key scan device\n");
+                goto fail6;
+        }
+
+        platform_set_drvdata(pdev, davinci_ks);
+        return 0;
+
+fail6:
+        free_irq(davinci_ks->irq, davinci_ks);
+fail5:
+        input_unregister_device(davinci_ks->input);
+        key_dev = NULL;
+fail4:
+        iounmap(davinci_ks->base);
+fail3:
+        release_mem_region(davinci_ks->pbase, davinci_ks->base_size);
+fail2:
+        input_free_device(key_dev);
+fail1:
+        kfree(davinci_ks);
+
+        return error;
+}
+
+static int __devexit davinci_ks_remove(struct platform_device *pdev)
+{
+        struct davinci_ks *davinci_ks = platform_get_drvdata(pdev);
+
+        free_irq(davinci_ks->irq, davinci_ks);
+
+        input_unregister_device(davinci_ks->input);
+
+        iounmap(davinci_ks->base);
+        release_mem_region(davinci_ks->pbase, davinci_ks->base_size);
+
+        platform_set_drvdata(pdev, NULL);
+
+        kfree(davinci_ks);
+
+        return 0;
+}
+
+static struct platform_driver davinci_ks_driver = {
+        .driver = {
+                .name = "davinci_keyscan",
+                .owner = THIS_MODULE,
+        },
+        .remove = __devexit_p(davinci_ks_remove),
+};
+
+static int __init davinci_ks_init(void)
+{
+        return platform_driver_probe(&davinci_ks_driver, davinci_ks_probe);
+}
+module_init(davinci_ks_init);
+
+static void __exit davinci_ks_exit(void)
+{
+        platform_driver_unregister(&davinci_ks_driver);
+}
+module_exit(davinci_ks_exit);
+
+MODULE_AUTHOR("Miguel Aguilar");
+MODULE_DESCRIPTION("Texas Instruments DaVinci Key Scan Driver");
+MODULE_LICENSE("GPL");