Input: add support for keyboards on ST SPEAr platform

Signed-off-by: Rajeev Kumar <rajeev-dlh.kumar@st.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

3 files changed, 354 insertions, 0 deletions

diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
index b8c51b9781db..ee85e5bf4b2a 100644
--- a/drivers/input/keyboard/Kconfig
+++ b/drivers/input/keyboard/Kconfig
@@ -443,6 +443,15 @@ config KEYBOARD_OMAP4
           To compile this driver as a module, choose M here: the
           module will be called omap4-keypad.
 
+config KEYBOARD_SPEAR
+        tristate "ST SPEAR keyboard support"
+        depends on PLAT_SPEAR
+        help
+          Say Y here if you want to use the SPEAR keyboard.
+
+          To compile this driver as a module, choose M here: the
+          module will be called spear-keboard.
+
 config KEYBOARD_TNETV107X
         tristate "TI TNETV107X keypad support"
         depends on ARCH_DAVINCI_TNETV107X
diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile
index a34452e8ebe2..8449c730892c 100644
--- a/drivers/input/keyboard/Makefile
+++ b/drivers/input/keyboard/Makefile
@@ -37,6 +37,7 @@ obj-$(CONFIG_KEYBOARD_PXA930_ROTARY)	+= pxa930_rotary.o
 obj-$(CONFIG_KEYBOARD_QT2160)           += qt2160.o
 obj-$(CONFIG_KEYBOARD_SAMSUNG)          += samsung-keypad.o
 obj-$(CONFIG_KEYBOARD_SH_KEYSC)         += sh_keysc.o
+obj-$(CONFIG_KEYBOARD_SPEAR)            += spear-keyboard.o
 obj-$(CONFIG_KEYBOARD_STMPE)            += stmpe-keypad.o
 obj-$(CONFIG_KEYBOARD_STOWAWAY)         += stowaway.o
 obj-$(CONFIG_KEYBOARD_SUNKBD)           += sunkbd.o
diff --git a/drivers/input/keyboard/spear-keyboard.c b/drivers/input/keyboard/spear-keyboard.c
new file mode 100644
index 000000000000..bee03d64c453
--- /dev/null
+++ b/drivers/input/keyboard/spear-keyboard.c
@@ -0,0 +1,344 @@
+/*
+ * SPEAr Keyboard Driver
+ * Based on omap-keypad driver
+ *
+ * Copyright (C) 2010 ST Microelectronics
+ * Rajeev Kumar<rajeev-dlh.kumar@st.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/clk.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/input.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/pm_wakeup.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <plat/keyboard.h>
+
+/* Keyboard Registers */
+#define MODE_REG        0x00    /* 16 bit reg */
+#define STATUS_REG      0x0C    /* 2 bit reg */
+#define DATA_REG        0x10    /* 8 bit reg */
+#define INTR_MASK       0x54
+
+/* Register Values */
+/*
+ * pclk freq mask = (APB FEQ -1)= 82 MHZ.Programme bit 15-9 in mode
+ * control register as 1010010(82MHZ)
+ */
+#define PCLK_FREQ_MSK   0xA400  /* 82 MHz */
+#define START_SCAN      0x0100
+#define SCAN_RATE_10    0x0000
+#define SCAN_RATE_20    0x0004
+#define SCAN_RATE_40    0x0008
+#define SCAN_RATE_80    0x000C
+#define MODE_KEYBOARD   0x0002
+#define DATA_AVAIL      0x2
+
+#define KEY_MASK        0xFF000000
+#define KEY_VALUE       0x00FFFFFF
+#define ROW_MASK        0xF0
+#define COLUMN_MASK     0x0F
+#define ROW_SHIFT       4
+
+struct spear_kbd {
+        struct input_dev *input;
+        struct resource *res;
+        void __iomem *io_base;
+        struct clk *clk;
+        unsigned int irq;
+        unsigned short last_key;
+        unsigned short keycodes[256];
+};
+
+static irqreturn_t spear_kbd_interrupt(int irq, void *dev_id)
+{
+        struct spear_kbd *kbd = dev_id;
+        struct input_dev *input = kbd->input;
+        unsigned int key;
+        u8 sts, val;
+
+        sts = readb(kbd->io_base + STATUS_REG);
+        if (sts & DATA_AVAIL)
+                return IRQ_NONE;
+
+        if (kbd->last_key != KEY_RESERVED) {
+                input_report_key(input, kbd->last_key, 0);
+                kbd->last_key = KEY_RESERVED;
+        }
+
+        /* following reads active (row, col) pair */
+        val = readb(kbd->io_base + DATA_REG);
+        key = kbd->keycodes[val];
+
+        input_event(input, EV_MSC, MSC_SCAN, val);
+        input_report_key(input, key, 1);
+        input_sync(input);
+
+        kbd->last_key = key;
+
+        /* clear interrupt */
+        writeb(0, kbd->io_base + STATUS_REG);
+
+        return IRQ_HANDLED;
+}
+
+static int spear_kbd_open(struct input_dev *dev)
+{
+        struct spear_kbd *kbd = input_get_drvdata(dev);
+        int error;
+        u16 val;
+
+        kbd->last_key = KEY_RESERVED;
+
+        error = clk_enable(kbd->clk);
+        if (error)
+                return error;
+
+        /* program keyboard */
+        val = SCAN_RATE_80 | MODE_KEYBOARD | PCLK_FREQ_MSK;
+        writew(val, kbd->io_base + MODE_REG);
+        writeb(1, kbd->io_base + STATUS_REG);
+
+        /* start key scan */
+        val = readw(kbd->io_base + MODE_REG);
+        val |= START_SCAN;
+        writew(val, kbd->io_base + MODE_REG);
+
+        return 0;
+}
+
+static void spear_kbd_close(struct input_dev *dev)
+{
+        struct spear_kbd *kbd = input_get_drvdata(dev);
+        u16 val;
+
+        /* stop key scan */
+        val = readw(kbd->io_base + MODE_REG);
+        val &= ~START_SCAN;
+        writew(val, kbd->io_base + MODE_REG);
+
+        clk_disable(kbd->clk);
+
+        kbd->last_key = KEY_RESERVED;
+}
+
+static int __devinit spear_kbd_probe(struct platform_device *pdev)
+{
+        const struct kbd_platform_data *pdata = pdev->dev.platform_data;
+        const struct matrix_keymap_data *keymap;
+        struct spear_kbd *kbd;
+        struct input_dev *input_dev;
+        struct resource *res;
+        int irq;
+        int error;
+
+        if (!pdata) {
+                dev_err(&pdev->dev, "Invalid platform data\n");
+                return -EINVAL;
+        }
+
+        keymap = pdata->keymap;
+        if (!keymap) {
+                dev_err(&pdev->dev, "no keymap defined\n");
+                return -EINVAL;
+        }
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!res) {
+                dev_err(&pdev->dev, "no keyboard resource defined\n");
+                return -EBUSY;
+        }
+
+        irq = platform_get_irq(pdev, 0);
+        if (irq < 0) {
+                dev_err(&pdev->dev, "not able to get irq for the device\n");
+                return irq;
+        }
+
+        kbd = kzalloc(sizeof(*kbd), GFP_KERNEL);
+        input_dev = input_allocate_device();
+        if (!kbd || !input_dev) {
+                dev_err(&pdev->dev, "out of memory\n");
+                error = -ENOMEM;
+                goto err_free_mem;
+        }
+
+        kbd->input = input_dev;
+        kbd->irq = irq;
+        kbd->res = request_mem_region(res->start, resource_size(res),
+                                      pdev->name);
+        if (!kbd->res) {
+                dev_err(&pdev->dev, "keyboard region already claimed\n");
+                error = -EBUSY;
+                goto err_free_mem;
+        }
+
+        kbd->io_base = ioremap(res->start, resource_size(res));
+        if (!kbd->io_base) {
+                dev_err(&pdev->dev, "ioremap failed for kbd_region\n");
+                error = -ENOMEM;
+                goto err_release_mem_region;
+        }
+
+        kbd->clk = clk_get(&pdev->dev, NULL);
+        if (IS_ERR(kbd->clk)) {
+                error = PTR_ERR(kbd->clk);
+                goto err_iounmap;
+        }
+
+        input_dev->name = "Spear Keyboard";
+        input_dev->phys = "keyboard/input0";
+        input_dev->dev.parent = &pdev->dev;
+        input_dev->id.bustype = BUS_HOST;
+        input_dev->id.vendor = 0x0001;
+        input_dev->id.product = 0x0001;
+        input_dev->id.version = 0x0100;
+        input_dev->open = spear_kbd_open;
+        input_dev->close = spear_kbd_close;
+
+        __set_bit(EV_KEY, input_dev->evbit);
+        if (pdata->rep)
+                __set_bit(EV_REP, input_dev->evbit);
+        input_set_capability(input_dev, EV_MSC, MSC_SCAN);
+
+        input_dev->keycode = kbd->keycodes;
+        input_dev->keycodesize = sizeof(kbd->keycodes[0]);
+        input_dev->keycodemax = ARRAY_SIZE(kbd->keycodes);
+
+        matrix_keypad_build_keymap(keymap, ROW_SHIFT,
+                        input_dev->keycode, input_dev->keybit);
+
+        input_set_drvdata(input_dev, kbd);
+
+        error = request_irq(irq, spear_kbd_interrupt, 0, "keyboard", kbd);
+        if (error) {
+                dev_err(&pdev->dev, "request_irq fail\n");
+                goto err_put_clk;
+        }
+
+        error = input_register_device(input_dev);
+        if (error) {
+                dev_err(&pdev->dev, "Unable to register keyboard device\n");
+                goto err_free_irq;
+        }
+
+        device_init_wakeup(&pdev->dev, 1);
+        platform_set_drvdata(pdev, kbd);
+
+        return 0;
+
+err_free_irq:
+        free_irq(kbd->irq, kbd);
+err_put_clk:
+        clk_put(kbd->clk);
+err_iounmap:
+        iounmap(kbd->io_base);
+err_release_mem_region:
+        release_mem_region(res->start, resource_size(res));
+err_free_mem:
+        input_free_device(input_dev);
+        kfree(kbd);
+
+        return error;
+}
+
+static int __devexit spear_kbd_remove(struct platform_device *pdev)
+{
+        struct spear_kbd *kbd = platform_get_drvdata(pdev);
+
+        free_irq(kbd->irq, kbd);
+        input_unregister_device(kbd->input);
+        clk_put(kbd->clk);
+        iounmap(kbd->io_base);
+        release_mem_region(kbd->res->start, resource_size(kbd->res));
+        kfree(kbd);
+
+        device_init_wakeup(&pdev->dev, 1);
+        platform_set_drvdata(pdev, NULL);
+
+        return 0;
+}
+
+#ifdef CONFIG_PM
+static int spear_kbd_suspend(struct device *dev)
+{
+        struct platform_device *pdev = to_platform_device(dev);
+        struct spear_kbd *kbd = platform_get_drvdata(pdev);
+        struct input_dev *input_dev = kbd->input;
+
+        mutex_lock(&input_dev->mutex);
+
+        if (input_dev->users)
+                clk_enable(kbd->clk);
+
+        if (device_may_wakeup(&pdev->dev))
+                enable_irq_wake(kbd->irq);
+
+        mutex_unlock(&input_dev->mutex);
+
+        return 0;
+}
+
+static int spear_kbd_resume(struct device *dev)
+{
+        struct platform_device *pdev = to_platform_device(dev);
+        struct spear_kbd *kbd = platform_get_drvdata(pdev);
+        struct input_dev *input_dev = kbd->input;
+
+        mutex_lock(&input_dev->mutex);
+
+        if (device_may_wakeup(&pdev->dev))
+                disable_irq_wake(kbd->irq);
+
+        if (input_dev->users)
+                clk_enable(kbd->clk);
+
+        mutex_unlock(&input_dev->mutex);
+
+        return 0;
+}
+
+static const struct dev_pm_ops spear_kbd_pm_ops = {
+        .suspend        = spear_kbd_suspend,
+        .resume         = spear_kbd_resume,
+};
+#endif
+
+static struct platform_driver spear_kbd_driver = {
+        .probe          = spear_kbd_probe,
+        .remove         = __devexit_p(spear_kbd_remove),
+        .driver         = {
+                .name   = "keyboard",
+                .owner  = THIS_MODULE,
+#ifdef CONFIG_PM
+                .pm     = &spear_kbd_pm_ops,
+#endif
+        },
+};
+
+static int __init spear_kbd_init(void)
+{
+        return platform_driver_register(&spear_kbd_driver);
+}
+module_init(spear_kbd_init);
+
+static void __exit spear_kbd_exit(void)
+{
+        platform_driver_unregister(&spear_kbd_driver);
+}
+module_exit(spear_kbd_exit);
+
+MODULE_AUTHOR("Rajeev Kumar");
+MODULE_DESCRIPTION("SPEAr Keyboard Driver");
+MODULE_LICENSE("GPL");