Input: add support for Blackfin BF54x Keypad controller

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

3 files changed, 392 insertions, 1 deletions

diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
index f6f79e880b20..2316a018fae6 100644
--- a/drivers/input/keyboard/Kconfig
+++ b/drivers/input/keyboard/Kconfig
@@ -284,4 +284,13 @@ config KEYBOARD_MAPLE
           To compile this driver as a module, choose M here: the
           module will be called maple_keyb.
 
+config KEYBOARD_BFIN
+        tristate "Blackfin BF54x keypad support"
+        depends on BF54x
+        help
+          Say Y here if you want to use the BF54x keypad.
+
+          To compile this driver as a module, choose M here: the
+          module will be called bf54x-keys.
+
 endif
diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile
index 2776aa4a3a95..e97455fdcc83 100644
--- a/drivers/input/keyboard/Makefile
+++ b/drivers/input/keyboard/Makefile
@@ -24,4 +24,4 @@ obj-$(CONFIG_KEYBOARD_GPIO)		+= gpio_keys.o
 obj-$(CONFIG_KEYBOARD_HP6XX)            += jornada680_kbd.o
 obj-$(CONFIG_KEYBOARD_HP7XX)            += jornada720_kbd.o
 obj-$(CONFIG_KEYBOARD_MAPLE)            += maple_keyb.o
-
+obj-$(CONFIG_KEYBOARD_BFIN)             += bf54x-keys.o
diff --git a/drivers/input/keyboard/bf54x-keys.c b/drivers/input/keyboard/bf54x-keys.c
new file mode 100644
index 000000000000..a67b29b089ef
--- /dev/null
+++ b/drivers/input/keyboard/bf54x-keys.c
@@ -0,0 +1,382 @@
+/*
+ * File:         drivers/input/keyboard/bf54x-keys.c
+ * Based on:
+ * Author:       Michael Hennerich <hennerich@blackfin.uclinux.org>
+ *
+ * Created:
+ * Description:  keypad driver for Analog Devices Blackfin BF54x Processors
+ *
+ *
+ * Modified:
+ *               Copyright 2007 Analog Devices Inc.
+ *
+ * Bugs:         Enter bugs at http://blackfin.uclinux.org/
+ *
+ * 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, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include <linux/module.h>
+#include <linux/version.h>
+
+#include <linux/init.h>
+#include <linux/fs.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/sched.h>
+#include <linux/pm.h>
+#include <linux/sysctl.h>
+#include <linux/proc_fs.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+#include <linux/input.h>
+#include <linux/irq.h>
+
+#include <asm/portmux.h>
+#include <asm/mach/bf54x_keys.h>
+
+#define DRV_NAME        "bf54x-keys"
+#define TIME_SCALE      100     /* 100 ns */
+#define MAX_MULT        (0xFF * TIME_SCALE)
+#define MAX_RC          8       /* Max Row/Col */
+
+static const u16 per_rows[] = {
+        P_KEY_ROW7,
+        P_KEY_ROW6,
+        P_KEY_ROW5,
+        P_KEY_ROW4,
+        P_KEY_ROW3,
+        P_KEY_ROW2,
+        P_KEY_ROW1,
+        P_KEY_ROW0,
+        0
+};
+
+static const u16 per_cols[] = {
+        P_KEY_COL7,
+        P_KEY_COL6,
+        P_KEY_COL5,
+        P_KEY_COL4,
+        P_KEY_COL3,
+        P_KEY_COL2,
+        P_KEY_COL1,
+        P_KEY_COL0,
+        0
+};
+
+struct bf54x_kpad {
+        struct input_dev *input;
+        int irq;
+        unsigned short lastkey;
+        unsigned short *keycode;
+        struct timer_list timer;
+        unsigned int keyup_test_jiffies;
+};
+
+static inline int bfin_kpad_find_key(struct bf54x_kpad *bf54x_kpad,
+                        struct input_dev *input, u16 keyident)
+{
+        u16 i;
+
+        for (i = 0; i < input->keycodemax; i++)
+                if (bf54x_kpad->keycode[i + input->keycodemax] == keyident)
+                        return bf54x_kpad->keycode[i];
+        return -1;
+}
+
+static inline void bfin_keycodecpy(unsigned short *keycode,
+                        const unsigned int *pdata_kc,
+                        unsigned short keymapsize)
+{
+        unsigned int i;
+
+        for (i = 0; i < keymapsize; i++) {
+                keycode[i] = pdata_kc[i] & 0xffff;
+                keycode[i + keymapsize] = pdata_kc[i] >> 16;
+        }
+}
+
+static inline u16 bfin_kpad_get_prescale(u32 timescale)
+{
+        u32 sclk = get_sclk();
+
+        return ((((sclk / 1000) * timescale) / 1024) - 1);
+}
+
+static inline u16 bfin_kpad_get_keypressed(struct bf54x_kpad *bf54x_kpad)
+{
+        return (bfin_read_KPAD_STAT() & KPAD_PRESSED);
+}
+
+static inline void bfin_kpad_clear_irq(void)
+{
+        bfin_write_KPAD_STAT(0xFFFF);
+        bfin_write_KPAD_ROWCOL(0xFFFF);
+}
+
+static void bfin_kpad_timer(unsigned long data)
+{
+        struct platform_device *pdev =  (struct platform_device *) data;
+        struct bf54x_kpad *bf54x_kpad = platform_get_drvdata(pdev);
+
+        if (bfin_kpad_get_keypressed(bf54x_kpad)) {
+                /* Try again later */
+                mod_timer(&bf54x_kpad->timer,
+                          jiffies + bf54x_kpad->keyup_test_jiffies);
+                return;
+        }
+
+        input_report_key(bf54x_kpad->input, bf54x_kpad->lastkey, 0);
+        input_sync(bf54x_kpad->input);
+
+        /* Clear IRQ Status */
+
+        bfin_kpad_clear_irq();
+        enable_irq(bf54x_kpad->irq);
+}
+
+static irqreturn_t bfin_kpad_isr(int irq, void *dev_id)
+{
+        struct platform_device *pdev = dev_id;
+        struct bf54x_kpad *bf54x_kpad = platform_get_drvdata(pdev);
+        struct input_dev *input = bf54x_kpad->input;
+        int key;
+        u16 rowcol = bfin_read_KPAD_ROWCOL();
+
+        key = bfin_kpad_find_key(bf54x_kpad, input, rowcol);
+
+        input_report_key(input, key, 1);
+        input_sync(input);
+
+        if (bfin_kpad_get_keypressed(bf54x_kpad)) {
+                disable_irq(bf54x_kpad->irq);
+                bf54x_kpad->lastkey = key;
+                mod_timer(&bf54x_kpad->timer,
+                          jiffies + bf54x_kpad->keyup_test_jiffies);
+        } else {
+                input_report_key(input, key, 0);
+                input_sync(input);
+
+                bfin_kpad_clear_irq();
+        }
+
+        return IRQ_HANDLED;
+}
+
+static int __devinit bfin_kpad_probe(struct platform_device *pdev)
+{
+        struct bf54x_kpad *bf54x_kpad;
+        struct bfin_kpad_platform_data *pdata = pdev->dev.platform_data;
+        struct input_dev *input;
+        int i, error;
+
+        if (!pdata->rows || !pdata->cols || !pdata->keymap) {
+                printk(KERN_ERR DRV_NAME
+                        ": No rows, cols or keymap from pdata\n");
+                return -EINVAL;
+        }
+
+        if (!pdata->keymapsize ||
+            pdata->keymapsize > (pdata->rows * pdata->cols)) {
+                printk(KERN_ERR DRV_NAME ": Invalid keymapsize\n");
+                return -EINVAL;
+        }
+
+        bf54x_kpad = kzalloc(sizeof(struct bf54x_kpad), GFP_KERNEL);
+        if (!bf54x_kpad)
+                return -ENOMEM;
+
+        platform_set_drvdata(pdev, bf54x_kpad);
+
+        /* Allocate memory for keymap followed by private LUT */
+        bf54x_kpad->keycode = kmalloc(pdata->keymapsize *
+                                        sizeof(unsigned short) * 2, GFP_KERNEL);
+        if (!bf54x_kpad->keycode) {
+                error = -ENOMEM;
+                goto out;
+        }
+
+        if (!pdata->debounce_time || !pdata->debounce_time > MAX_MULT ||
+            !pdata->coldrive_time || !pdata->coldrive_time > MAX_MULT) {
+                printk(KERN_ERR DRV_NAME
+                        ": Invalid Debounce/Columdrive Time from pdata\n");
+                bfin_write_KPAD_MSEL(0xFF0);    /* Default MSEL */
+        } else {
+                bfin_write_KPAD_MSEL(
+                        ((pdata->debounce_time / TIME_SCALE)
+                                                & DBON_SCALE) |
+                        (((pdata->coldrive_time / TIME_SCALE) << 8)
+                                                & COLDRV_SCALE));
+
+        }
+
+        if (!pdata->keyup_test_interval)
+                bf54x_kpad->keyup_test_jiffies = msecs_to_jiffies(50);
+        else
+                bf54x_kpad->keyup_test_jiffies =
+                        msecs_to_jiffies(pdata->keyup_test_interval);
+
+        if (peripheral_request_list((u16 *)&per_rows[MAX_RC - pdata->rows],
+                                    DRV_NAME)) {
+                printk(KERN_ERR DRV_NAME
+                        ": Requesting Peripherals failed\n");
+                error = -EFAULT;
+                goto out0;
+        }
+
+        if (peripheral_request_list((u16 *)&per_cols[MAX_RC - pdata->cols],
+                                    DRV_NAME)) {
+                printk(KERN_ERR DRV_NAME
+                        ": Requesting Peripherals failed\n");
+                error = -EFAULT;
+                goto out1;
+        }
+
+        bf54x_kpad->irq = platform_get_irq(pdev, 0);
+        if (bf54x_kpad->irq < 0) {
+                error = -ENODEV;
+                goto out2;
+        }
+
+        error = request_irq(bf54x_kpad->irq, bfin_kpad_isr,
+                                 IRQF_SAMPLE_RANDOM, DRV_NAME, pdev);
+        if (error) {
+                printk(KERN_ERR DRV_NAME
+                        ": unable to claim irq %d; error %d\n",
+                        bf54x_kpad->irq, error);
+                error = -EBUSY;
+                goto out2;
+        }
+
+        input = input_allocate_device();
+        if (!input) {
+                error = -ENOMEM;
+                goto out3;
+        }
+
+        bf54x_kpad->input = input;
+
+        input->name = pdev->name;
+        input->phys = "bf54x-keys/input0";
+        input->dev.parent = &pdev->dev;
+
+        input_set_drvdata(input, bf54x_kpad);
+
+        input->id.bustype = BUS_HOST;
+        input->id.vendor = 0x0001;
+        input->id.product = 0x0001;
+        input->id.version = 0x0100;
+
+        input->keycodesize = sizeof(unsigned short);
+        input->keycodemax = pdata->keymapsize;
+        input->keycode = bf54x_kpad->keycode;
+
+        bfin_keycodecpy(bf54x_kpad->keycode, pdata->keymap, pdata->keymapsize);
+
+        /* setup input device */
+        __set_bit(EV_KEY, input->evbit);
+
+        if (pdata->repeat)
+                __set_bit(EV_REP, input->evbit);
+
+        for (i = 0; i < input->keycodemax; i++)
+                __set_bit(bf54x_kpad->keycode[i] & KEY_MAX, input->keybit);
+        __clear_bit(KEY_RESERVED, input->keybit);
+
+        error = input_register_device(input);
+        if (error) {
+                printk(KERN_ERR DRV_NAME
+                        ": Unable to register input device (%d)\n", error);
+                goto out4;
+        }
+
+        /* Init Keypad Key Up/Release test timer */
+
+        setup_timer(&bf54x_kpad->timer, bfin_kpad_timer, (unsigned long) pdev);
+
+        bfin_write_KPAD_PRESCALE(bfin_kpad_get_prescale(TIME_SCALE));
+
+        bfin_write_KPAD_CTL((((pdata->cols - 1) << 13) & KPAD_COLEN) |
+                                (((pdata->rows - 1) << 10) & KPAD_ROWEN) |
+                                (2 & KPAD_IRQMODE));
+
+        bfin_write_KPAD_CTL(bfin_read_KPAD_CTL() | KPAD_EN);
+
+        printk(KERN_ERR DRV_NAME
+                ": Blackfin BF54x Keypad registered IRQ %d\n", bf54x_kpad->irq);
+
+        return 0;
+
+out4:
+        input_free_device(input);
+out3:
+        free_irq(bf54x_kpad->irq, pdev);
+out2:
+        peripheral_free_list((u16 *)&per_cols[MAX_RC - pdata->cols]);
+out1:
+        peripheral_free_list((u16 *)&per_rows[MAX_RC - pdata->rows]);
+out0:
+        kfree(bf54x_kpad->keycode);
+out:
+        kfree(bf54x_kpad);
+        platform_set_drvdata(pdev, NULL);
+
+        return error;
+}
+
+static int __devexit bfin_kpad_remove(struct platform_device *pdev)
+{
+        struct bfin_kpad_platform_data *pdata = pdev->dev.platform_data;
+        struct bf54x_kpad *bf54x_kpad = platform_get_drvdata(pdev);
+
+        del_timer_sync(&bf54x_kpad->timer);
+        free_irq(bf54x_kpad->irq, pdev);
+
+        input_unregister_device(bf54x_kpad->input);
+
+        peripheral_free_list((u16 *)&per_rows[MAX_RC - pdata->rows]);
+        peripheral_free_list((u16 *)&per_cols[MAX_RC - pdata->cols]);
+
+        kfree(bf54x_kpad->keycode);
+        kfree(bf54x_kpad);
+        platform_set_drvdata(pdev, NULL);
+
+        return 0;
+}
+
+struct platform_driver bfin_kpad_device_driver = {
+        .probe          = bfin_kpad_probe,
+        .remove         = __devexit_p(bfin_kpad_remove),
+        .driver         = {
+                .name   = DRV_NAME,
+        }
+};
+
+static int __init bfin_kpad_init(void)
+{
+        return platform_driver_register(&bfin_kpad_device_driver);
+}
+
+static void __exit bfin_kpad_exit(void)
+{
+        platform_driver_unregister(&bfin_kpad_device_driver);
+}
+
+module_init(bfin_kpad_init);
+module_exit(bfin_kpad_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
+MODULE_DESCRIPTION("Keypad driver for BF54x Processors");