Input: add support for Nomadik SKE keypad controller

Add support for the keypad controller in the Scroll Key Encoder (SKE)
module on the Nomadik family and the DB8500 SoC.

Acked-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Sundar Iyer <sundar.iyer@stericsson.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

4 files changed, 469 insertions, 0 deletions

diff --git a/arch/arm/plat-nomadik/include/plat/ske.h b/arch/arm/plat-nomadik/include/plat/ske.h
new file mode 100644
index 000000000000..31382fbc07dc
--- /dev/null
+++ b/arch/arm/plat-nomadik/include/plat/ske.h
@@ -0,0 +1,50 @@
+/*
+ * Copyright (C) ST-Ericsson SA 2010
+ *
+ * License Terms: GNU General Public License v2
+ * Author: Naveen Kumar Gaddipati <naveen.gaddipati@stericsson.com>
+ *
+ * ux500 Scroll key and Keypad Encoder (SKE) header
+ */
+
+#ifndef __SKE_H
+#define __SKE_H
+
+#include <linux/input/matrix_keypad.h>
+
+/* register definitions for SKE peripheral */
+#define SKE_CR          0x00
+#define SKE_VAL0        0x04
+#define SKE_VAL1        0x08
+#define SKE_DBCR        0x0C
+#define SKE_IMSC        0x10
+#define SKE_RIS         0x14
+#define SKE_MIS         0x18
+#define SKE_ICR         0x1C
+
+/*
+ * Keypad module
+ */
+
+/**
+ * struct keypad_platform_data - structure for platform specific data
+ * @init:       pointer to keypad init function
+ * @exit:       pointer to keypad deinitialisation function
+ * @keymap_data: matrix scan code table for keycodes
+ * @krow:       maximum number of rows
+ * @kcol:       maximum number of columns
+ * @debounce_ms: platform specific debounce time
+ * @no_autorepeat: flag for auto repetition
+ * @wakeup_enable: allow waking up the system
+ */
+struct ske_keypad_platform_data {
+        int (*init)(void);
+        int (*exit)(void);
+        const struct matrix_keymap_data *keymap_data;
+        u8 krow;
+        u8 kcol;
+        u8 debounce_ms;
+        bool no_autorepeat;
+        bool wakeup_enable;
+};
+#endif  /*__SKE_KPD_H*/
diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
index 4f300488e1f3..d63f5664e3fb 100644
--- a/drivers/input/keyboard/Kconfig
+++ b/drivers/input/keyboard/Kconfig
@@ -327,6 +327,16 @@ config KEYBOARD_NEWTON
           To compile this driver as a module, choose M here: the
           module will be called newtonkbd.
 
+config KEYBOARD_NOMADIK
+        tristate "ST-Ericsson Nomadik SKE keyboard"
+        depends on PLAT_NOMADIK
+        help
+          Say Y here if you want to use a keypad provided on the SKE controller
+          used on the Ux500 and Nomadik platforms
+
+          To compile this driver as a module, choose M here: the
+          module will be called nmk-ske-keypad.
+
 config KEYBOARD_OPENCORES
         tristate "OpenCores Keyboard Controller"
         help
diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile
index 8ac01fb642c1..c13809c5c3a7 100644
--- a/drivers/input/keyboard/Makefile
+++ b/drivers/input/keyboard/Makefile
@@ -28,6 +28,7 @@ obj-$(CONFIG_KEYBOARD_MATRIX)		+= matrix_keypad.o
 obj-$(CONFIG_KEYBOARD_MAX7359)          += max7359_keypad.o
 obj-$(CONFIG_KEYBOARD_MCS)              += mcs_touchkey.o
 obj-$(CONFIG_KEYBOARD_NEWTON)           += newtonkbd.o
+obj-$(CONFIG_KEYBOARD_NOMADIK)          += nomadik-ske-keypad.o
 obj-$(CONFIG_KEYBOARD_OMAP)             += omap-keypad.o
 obj-$(CONFIG_KEYBOARD_OMAP4)            += omap4-keypad.o
 obj-$(CONFIG_KEYBOARD_OPENCORES)        += opencores-kbd.o
diff --git a/drivers/input/keyboard/nomadik-ske-keypad.c b/drivers/input/keyboard/nomadik-ske-keypad.c
new file mode 100644
index 000000000000..6e0f23091360
--- /dev/null
+++ b/drivers/input/keyboard/nomadik-ske-keypad.c
@@ -0,0 +1,408 @@
+/*
+ * Copyright (C) ST-Ericsson SA 2010
+ *
+ * Author: Naveen Kumar G <naveen.gaddipati@stericsson.com> for ST-Ericsson
+ * Author: Sundar Iyer <sundar.iyer@stericsson.com> for ST-Ericsson
+ *
+ * License terms:GNU General Public License (GPL) version 2
+ *
+ * Keypad controller driver for the SKE (Scroll Key Encoder) module used in
+ * the Nomadik 8815 and Ux500 platforms.
+ */
+
+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
+#include <linux/spinlock.h>
+#include <linux/io.h>
+#include <linux/delay.h>
+#include <linux/input.h>
+#include <linux/slab.h>
+#include <linux/clk.h>
+
+#include <plat/ske.h>
+
+/* SKE_CR bits */
+#define SKE_KPMLT       (0x1 << 6)
+#define SKE_KPCN        (0x7 << 3)
+#define SKE_KPASEN      (0x1 << 2)
+#define SKE_KPASON      (0x1 << 7)
+
+/* SKE_IMSC bits */
+#define SKE_KPIMA       (0x1 << 2)
+
+/* SKE_ICR bits */
+#define SKE_KPICS       (0x1 << 3)
+#define SKE_KPICA       (0x1 << 2)
+
+/* SKE_RIS bits */
+#define SKE_KPRISA      (0x1 << 2)
+
+#define SKE_KEYPAD_ROW_SHIFT    3
+#define SKE_KPD_KEYMAP_SIZE     (8 * 8)
+
+/* keypad auto scan registers */
+#define SKE_ASR0        0x20
+#define SKE_ASR1        0x24
+#define SKE_ASR2        0x28
+#define SKE_ASR3        0x2C
+
+#define SKE_NUM_ASRX_REGISTERS  (4)
+
+/**
+ * struct ske_keypad  - data structure used by keypad driver
+ * @irq:        irq no
+ * @reg_base:   ske regsiters base address
+ * @input:      pointer to input device object
+ * @board:      keypad platform device
+ * @keymap:     matrix scan code table for keycodes
+ * @clk:        clock structure pointer
+ */
+struct ske_keypad {
+        int irq;
+        void __iomem *reg_base;
+        struct input_dev *input;
+        const struct ske_keypad_platform_data *board;
+        unsigned short keymap[SKE_KPD_KEYMAP_SIZE];
+        struct clk *clk;
+        spinlock_t ske_keypad_lock;
+};
+
+static void ske_keypad_set_bits(struct ske_keypad *keypad, u16 addr,
+                u8 mask, u8 data)
+{
+        u32 ret;
+
+        spin_lock(&keypad->ske_keypad_lock);
+
+        ret = readl(keypad->reg_base + addr);
+        ret &= ~mask;
+        ret |= data;
+        writel(ret, keypad->reg_base + addr);
+
+        spin_unlock(&keypad->ske_keypad_lock);
+}
+
+/*
+ * ske_keypad_chip_init: init keypad controller configuration
+ *
+ * Enable Multi key press detection, auto scan mode
+ */
+static int __devinit ske_keypad_chip_init(struct ske_keypad *keypad)
+{
+        u32 value;
+        int timeout = 50;
+
+        /* check SKE_RIS to be 0 */
+        while ((readl(keypad->reg_base + SKE_RIS) != 0x00000000) && timeout--)
+                cpu_relax();
+
+        if (!timeout)
+                return -EINVAL;
+
+        /*
+         * set debounce value
+         * keypad dbounce is configured in DBCR[15:8]
+         * dbounce value in steps of 32/32.768 ms
+         */
+        spin_lock(&keypad->ske_keypad_lock);
+        value = readl(keypad->reg_base + SKE_DBCR);
+        value = value & 0xff;
+        value |= ((keypad->board->debounce_ms * 32000)/32768) << 8;
+        writel(value, keypad->reg_base + SKE_DBCR);
+        spin_unlock(&keypad->ske_keypad_lock);
+
+        /* enable multi key detection */
+        ske_keypad_set_bits(keypad, SKE_CR, 0x0, SKE_KPMLT);
+
+        /*
+         * set up the number of columns
+         * KPCN[5:3] defines no. of keypad columns to be auto scanned
+         */
+        value = (keypad->board->kcol - 1) << 3;
+        ske_keypad_set_bits(keypad, SKE_CR, SKE_KPCN, value);
+
+        /* clear keypad interrupt for auto(and pending SW) scans */
+        ske_keypad_set_bits(keypad, SKE_ICR, 0x0, SKE_KPICA | SKE_KPICS);
+
+        /* un-mask keypad interrupts */
+        ske_keypad_set_bits(keypad, SKE_IMSC, 0x0, SKE_KPIMA);
+
+        /* enable automatic scan */
+        ske_keypad_set_bits(keypad, SKE_CR, 0x0, SKE_KPASEN);
+
+        return 0;
+}
+
+static void ske_keypad_read_data(struct ske_keypad *keypad)
+{
+        struct input_dev *input = keypad->input;
+        u16 status;
+        int col = 0, row = 0, code;
+        int ske_asr, ske_ris, key_pressed, i;
+
+        /*
+         * Read the auto scan registers
+         *
+         * Each SKE_ASRx (x=0 to x=3) contains two row values.
+         * lower byte contains row value for column 2*x,
+         * upper byte contains row value for column 2*x + 1
+         */
+        for (i = 0; i < SKE_NUM_ASRX_REGISTERS; i++) {
+                ske_asr = readl(keypad->reg_base + SKE_ASR0 + (4 * i));
+                if (!ske_asr)
+                        continue;
+
+                /* now that ASRx is zero, find out the column x and row y*/
+                if (ske_asr & 0xff) {
+                        col = i * 2;
+                        status = ske_asr & 0xff;
+                } else {
+                        col = (i * 2) + 1;
+                        status = (ske_asr & 0xff00) >> 8;
+                }
+
+                /* find out the row */
+                row = __ffs(status);
+
+                code = MATRIX_SCAN_CODE(row, col, SKE_KEYPAD_ROW_SHIFT);
+                ske_ris = readl(keypad->reg_base + SKE_RIS);
+                key_pressed = ske_ris & SKE_KPRISA;
+
+                input_event(input, EV_MSC, MSC_SCAN, code);
+                input_report_key(input, keypad->keymap[code], key_pressed);
+                input_sync(input);
+        }
+}
+
+static irqreturn_t ske_keypad_irq(int irq, void *dev_id)
+{
+        struct ske_keypad *keypad = dev_id;
+        int retries = 20;
+
+        /* disable auto scan interrupt; mask the interrupt generated */
+        ske_keypad_set_bits(keypad, SKE_IMSC, ~SKE_KPIMA, 0x0);
+        ske_keypad_set_bits(keypad, SKE_ICR, 0x0, SKE_KPICA);
+
+        while ((readl(keypad->reg_base + SKE_CR) & SKE_KPASON) && --retries)
+                msleep(5);
+
+        if (retries) {
+                /* SKEx registers are stable and can be read */
+                ske_keypad_read_data(keypad);
+        }
+
+        /* enable auto scan interrupts */
+        ske_keypad_set_bits(keypad, SKE_IMSC, 0x0, SKE_KPIMA);
+
+        return IRQ_HANDLED;
+}
+
+static int __devinit ske_keypad_probe(struct platform_device *pdev)
+{
+        const struct ske_keypad_platform_data *plat = pdev->dev.platform_data;
+        struct ske_keypad *keypad;
+        struct input_dev *input;
+        struct resource *res;
+        int irq;
+        int error;
+
+        if (!plat) {
+                dev_err(&pdev->dev, "invalid keypad platform data\n");
+                return -EINVAL;
+        }
+
+        irq = platform_get_irq(pdev, 0);
+        if (irq < 0) {
+                dev_err(&pdev->dev, "failed to get keypad irq\n");
+                return -EINVAL;
+        }
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!res) {
+                dev_err(&pdev->dev, "missing platform resources\n");
+                return -EINVAL;
+        }
+
+        keypad = kzalloc(sizeof(struct ske_keypad), GFP_KERNEL);
+        input = input_allocate_device();
+        if (!keypad || !input) {
+                dev_err(&pdev->dev, "failed to allocate keypad memory\n");
+                error = -ENOMEM;
+                goto err_free_mem;
+        }
+
+        keypad->irq = irq;
+        keypad->board = plat;
+        keypad->input = input;
+        spin_lock_init(&keypad->ske_keypad_lock);
+
+        if (!request_mem_region(res->start, resource_size(res), pdev->name)) {
+                dev_err(&pdev->dev, "failed to request I/O memory\n");
+                error = -EBUSY;
+                goto err_free_mem;
+        }
+
+        keypad->reg_base = ioremap(res->start, resource_size(res));
+        if (!keypad->reg_base) {
+                dev_err(&pdev->dev, "failed to remap I/O memory\n");
+                error = -ENXIO;
+                goto err_free_mem_region;
+        }
+
+        keypad->clk = clk_get(&pdev->dev, NULL);
+        if (IS_ERR(keypad->clk)) {
+                dev_err(&pdev->dev, "failed to get clk\n");
+                error = PTR_ERR(keypad->clk);
+                goto err_iounmap;
+        }
+
+        input->id.bustype = BUS_HOST;
+        input->name = "ux500-ske-keypad";
+        input->dev.parent = &pdev->dev;
+
+        input->keycode = keypad->keymap;
+        input->keycodesize = sizeof(keypad->keymap[0]);
+        input->keycodemax = ARRAY_SIZE(keypad->keymap);
+
+        input_set_capability(input, EV_MSC, MSC_SCAN);
+
+        __set_bit(EV_KEY, input->evbit);
+        if (!plat->no_autorepeat)
+                __set_bit(EV_REP, input->evbit);
+
+        matrix_keypad_build_keymap(plat->keymap_data, SKE_KEYPAD_ROW_SHIFT,
+                        input->keycode, input->keybit);
+
+        clk_enable(keypad->clk);
+
+        /* go through board initialization helpers */
+        if (keypad->board->init)
+                keypad->board->init();
+
+        error = ske_keypad_chip_init(keypad);
+        if (error) {
+                dev_err(&pdev->dev, "unable to init keypad hardware\n");
+                goto err_clk_disable;
+        }
+
+        error = request_threaded_irq(keypad->irq, NULL, ske_keypad_irq,
+                                     IRQF_ONESHOT, "ske-keypad", keypad);
+        if (error) {
+                dev_err(&pdev->dev, "allocate irq %d failed\n", keypad->irq);
+                goto err_clk_disable;
+        }
+
+        error = input_register_device(input);
+        if (error) {
+                dev_err(&pdev->dev,
+                                "unable to register input device: %d\n", error);
+                goto err_free_irq;
+        }
+
+        if (plat->wakeup_enable)
+                device_init_wakeup(&pdev->dev, true);
+
+        platform_set_drvdata(pdev, keypad);
+
+        return 0;
+
+err_free_irq:
+        free_irq(keypad->irq, keypad);
+err_clk_disable:
+        clk_disable(keypad->clk);
+        clk_put(keypad->clk);
+err_iounmap:
+        iounmap(keypad->reg_base);
+err_free_mem_region:
+        release_mem_region(res->start, resource_size(res));
+err_free_mem:
+        input_free_device(input);
+        kfree(keypad);
+        return error;
+}
+
+static int __devexit ske_keypad_remove(struct platform_device *pdev)
+{
+        struct ske_keypad *keypad = platform_get_drvdata(pdev);
+        struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+
+        free_irq(keypad->irq, keypad);
+
+        input_unregister_device(keypad->input);
+
+        clk_disable(keypad->clk);
+        clk_put(keypad->clk);
+
+        if (keypad->board->exit)
+                keypad->board->exit();
+
+        iounmap(keypad->reg_base);
+        release_mem_region(res->start, resource_size(res));
+        kfree(keypad);
+
+        return 0;
+}
+
+#ifdef CONFIG_PM
+static int ske_keypad_suspend(struct device *dev)
+{
+        struct platform_device *pdev = to_platform_device(dev);
+        struct ske_keypad *keypad = platform_get_drvdata(pdev);
+        int irq = platform_get_irq(pdev, 0);
+
+        if (device_may_wakeup(dev))
+                enable_irq_wake(irq);
+        else
+                ske_keypad_set_bits(keypad, SKE_IMSC, ~SKE_KPIMA, 0x0);
+
+        return 0;
+}
+
+static int ske_keypad_resume(struct device *dev)
+{
+        struct platform_device *pdev = to_platform_device(dev);
+        struct ske_keypad *keypad = platform_get_drvdata(pdev);
+        int irq = platform_get_irq(pdev, 0);
+
+        if (device_may_wakeup(dev))
+                disable_irq_wake(irq);
+        else
+                ske_keypad_set_bits(keypad, SKE_IMSC, 0x0, SKE_KPIMA);
+
+        return 0;
+}
+
+static const struct dev_pm_ops ske_keypad_dev_pm_ops = {
+        .suspend = ske_keypad_suspend,
+        .resume = ske_keypad_resume,
+};
+#endif
+
+struct platform_driver ske_keypad_driver = {
+        .driver = {
+                .name = "nmk-ske-keypad",
+                .owner  = THIS_MODULE,
+#ifdef CONFIG_PM
+                .pm = &ske_keypad_dev_pm_ops,
+#endif
+        },
+        .probe = ske_keypad_probe,
+        .remove = __devexit_p(ske_keypad_remove),
+};
+
+static int __init ske_keypad_init(void)
+{
+        return platform_driver_probe(&ske_keypad_driver, ske_keypad_probe);
+}
+module_init(ske_keypad_init);
+
+static void __exit ske_keypad_exit(void)
+{
+        platform_driver_unregister(&ske_keypad_driver);
+}
+module_exit(ske_keypad_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Naveen Kumar <naveen.gaddipati@stericsson.com> / Sundar Iyer <sundar.iyer@stericsson.com>");
+MODULE_DESCRIPTION("Nomadik Scroll-Key-Encoder Keypad Driver");
+MODULE_ALIAS("platform:nomadik-ske-keypad");