[PATCH V2 21/69] Keyboard: Adding support for spear-keyboard
Viresh KUMAR
viresh.kumar at st.com
Fri Oct 1 07:55:41 EDT 2010
From: Rajeev Kumar <rajeev-dlh.kumar at st.com>
Signed-off-by: Rajeev Kumar <rajeev-dlh.kumar at st.com>
---
drivers/input/keyboard/Kconfig | 9 +
drivers/input/keyboard/Makefile | 1 +
drivers/input/keyboard/spear-keyboard.c | 362 +++++++++++++++++++++++++++++++
3 files changed, 372 insertions(+), 0 deletions(-)
create mode 100644 drivers/input/keyboard/spear-keyboard.c
diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
index 9cc488d..cb9f6b1 100644
--- a/drivers/input/keyboard/Kconfig
+++ b/drivers/input/keyboard/Kconfig
@@ -424,6 +424,15 @@ config KEYBOARD_OMAP
To compile this driver as a module, choose M here: the
module will be called omap-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_TWL4030
tristate "TI TWL4030/TWL5030/TPS659x0 keypad support"
depends on TWL4030_CORE
diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile
index 504b591..b21c54d 100644
--- a/drivers/input/keyboard/Makefile
+++ b/drivers/input/keyboard/Makefile
@@ -35,6 +35,7 @@ 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 0000000..4830e11
--- /dev/null
+++ b/drivers/input/keyboard/spear-keyboard.c
@@ -0,0 +1,362 @@
+/*
+ * drivers/input/keyboard/keyboard-spear.c
+ *
+ * SPEAr Keyboard Driver
+ * Based on omap-keypad driver
+ *
+ * Copyright (C) 2010 ST Microelectronics
+ * Rajeev Kumar<rajeev-dlh.kumar at 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 Regsiters */
+#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;
+ void __iomem *io_base; /* Keyboard Base Address */
+ struct clk *clk;
+ u8 last_key ;
+ u8 last_event;
+ int *keymap;
+ int keymapsize;
+};
+/* TODO: Need to optimize this function */
+static inline int get_key_value(struct spear_kbd *dev, int row, int col)
+{
+ int i, key;
+
+ key = KEY(row, col, 0);
+ for (i = 0; i < dev->keymapsize; i++)
+ if ((dev->keymap[i] & KEY_MASK) == key)
+ return dev->keymap[i] & KEY_VALUE;
+ return -ENOKEY;
+}
+
+static irqreturn_t spear_kbd_interrupt(int irq, void *dev_id)
+{
+ struct spear_kbd *dev = dev_id;
+ int key;
+ u8 sts, val = 0;
+
+ sts = readb(dev->io_base + STATUS_REG);
+ if (sts & DATA_AVAIL) {
+ /* following reads active (row, col) pair */
+ val = readb(dev->io_base + DATA_REG);
+ key = get_key_value(dev, (val & ROW_MASK)>>ROW_SHIFT, (val
+ & COLUMN_MASK));
+
+ /* valid key press event */
+ if (key >= 0) {
+ if (dev->last_event == 1) {
+ /* check if we missed a release event */
+ input_report_key(dev->input, dev->last_key,
+ !dev->last_event);
+ }
+ /* notify key press */
+ dev->last_event = 1;
+ dev->last_key = key;
+ input_report_key(dev->input, key, dev->last_event);
+ } else {
+ /* notify key release */
+ dev->last_event = 0;
+ input_report_key(dev->input, dev->last_key,
+ dev->last_event);
+ }
+ } else
+ return IRQ_NONE;
+
+ /* clear interrupt */
+ writeb(0, dev->io_base + STATUS_REG);
+
+ return IRQ_HANDLED;
+}
+
+static int spear_kbd_open(struct input_dev *dev)
+{
+ struct spear_kbd *kbd = input_get_drvdata(dev);
+ u16 val;
+
+ /* 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);
+}
+
+static int __init spear_kbd_probe(struct platform_device *pdev)
+{
+ struct spear_kbd *kbd;
+ struct kbd_platform_data *pdata = pdev->dev.platform_data;
+ struct resource *res;
+ int i, ret, irq, size;
+ u16 val = 0;
+
+ if (!pdata) {
+ dev_err(&pdev->dev, "Invalid platform data\n");
+ return -EINVAL;
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(&pdev->dev, "no keyboard resource defined\n");
+ return -EBUSY;
+ }
+
+ if (!request_mem_region(res->start, resource_size(res), pdev->name)) {
+ dev_err(&pdev->dev, "keyboard region already claimed\n");
+ return -EBUSY;
+ }
+
+ kbd = kzalloc(sizeof(*kbd), GFP_KERNEL);
+ if (!kbd) {
+ dev_err(&pdev->dev, "out of memory\n");
+ ret = -ENOMEM;
+ goto err_release_mem_region;
+ }
+
+ kbd->clk = clk_get(&pdev->dev, NULL);
+ if (IS_ERR(kbd->clk)) {
+ ret = PTR_ERR(kbd->clk);
+ goto err_kfree;
+ }
+
+ ret = clk_enable(kbd->clk);
+ if (ret < 0)
+ goto err_clk_put;
+
+ platform_set_drvdata(pdev, kbd);
+ kbd->keymapsize = pdata->keymapsize;
+ size = kbd->keymapsize * sizeof(*pdata->keymap);
+ kbd->keymap = kmalloc(size, GFP_KERNEL);
+ if (!kbd->keymap)
+ goto err_clear_plat_data;
+
+ memcpy(kbd->keymap, pdata->keymap, size);
+
+ kbd->io_base = ioremap(res->start, resource_size(res));
+ if (!kbd->io_base) {
+ dev_err(&pdev->dev, "ioremap fail for kbd_region\n");
+ ret = -ENOMEM;
+ goto err_kfree_keymap;
+ }
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0) {
+ dev_err(&pdev->dev, "not able to get irq for the device\n");
+ ret = irq;
+ goto err_iounmap;
+ }
+
+ kbd->input = input_allocate_device();
+ if (!kbd->input) {
+ ret = -ENOMEM;
+ dev_err(&pdev->dev, "input device allocation fail\n");
+ goto err_iounmap;
+ }
+
+ if (pdata->rep)
+ __set_bit(EV_REP, kbd->input->evbit);
+
+ /* setup input device */
+ __set_bit(EV_KEY, kbd->input->evbit);
+
+ for (i = 0; i < kbd->keymapsize; i++)
+ __set_bit(kbd->keymap[i] & KEY_MAX, kbd->input->keybit);
+
+ kbd->input->name = "keyboard";
+ kbd->input->phys = "keyboard/input0";
+ kbd->input->dev.parent = &pdev->dev;
+ kbd->input->id.bustype = BUS_HOST;
+ kbd->input->id.vendor = 0x0001;
+ kbd->input->id.product = 0x0001;
+ kbd->input->id.version = 0x0100;
+ kbd->input->open = spear_kbd_open;
+ kbd->input->close = spear_kbd_close;
+ input_set_drvdata(kbd->input, kbd);
+
+ ret = input_register_device(kbd->input);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "Unable to register keyboard device\n");
+ goto err_free_dev;
+ }
+
+ /* 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);
+
+ device_init_wakeup(&pdev->dev, 1);
+
+ ret = request_irq(irq, spear_kbd_interrupt, 0, "keyboard",
+ kbd);
+ if (ret) {
+ dev_err(&pdev->dev, "request_irq fail\n");
+ goto err_unregister_dev;
+ }
+
+ return 0;
+
+err_unregister_dev:
+ input_unregister_device(kbd->input);
+ goto err_iounmap;
+err_free_dev:
+ input_free_device(kbd->input);
+err_iounmap:
+ iounmap(kbd->io_base);
+err_kfree_keymap:
+ kfree(kbd->keymap);
+err_clear_plat_data:
+ platform_set_drvdata(pdev, NULL);
+ clk_disable(kbd->clk);
+err_clk_put:
+ clk_put(kbd->clk);
+err_kfree:
+ kfree(kbd);
+err_release_mem_region:
+ release_mem_region(res->start, resource_size(res));
+
+ return ret;
+}
+
+static int spear_kbd_remove(struct platform_device *pdev)
+{
+ struct spear_kbd *kbd = platform_get_drvdata(pdev);
+ struct resource *res;
+ int irq;
+
+ irq = platform_get_irq(pdev, 0);
+ free_irq(irq, pdev);
+
+ /* unregister input device */
+ input_unregister_device(kbd->input);
+
+ iounmap(kbd->io_base);
+ kfree(kbd->keymap);
+ platform_set_drvdata(pdev, NULL);
+ clk_disable(kbd->clk);
+ clk_put(kbd->clk);
+ kfree(kbd);
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (res)
+ release_mem_region(res->start, resource_size(res));
+
+ 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);
+ int irq;
+
+ irq = platform_get_irq(pdev, 0);
+ clk_disable(kbd->clk);
+ if (device_may_wakeup(&pdev->dev))
+ enable_irq_wake(irq);
+
+ 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);
+ int irq;
+
+ irq = platform_get_irq(pdev, 0);
+ if (device_may_wakeup(&pdev->dev))
+ disable_irq_wake(irq);
+ clk_enable(kbd->clk);
+
+ 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 = spear_kbd_remove,
+ .driver = {
+ .name = "keyboard",
+ .owner = THIS_MODULE,
+#ifdef CONFIG_PM
+ .pm = &spear_kbd_pm_ops,
+#endif
+ },
+};
+
+static int __devinit 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");
--
1.7.2.2
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