new file mode 100644
@@ -0,0 +1,18 @@
+#ifndef __MACH_MXC_KEYPAD_H
+#define __MACH_MXC_KEYPAD_H
+
+#include <linux/input/matrix_keypad.h>
+
+#define MAX_MATRIX_KEY_ROWS 8
+#define MAX_MATRIX_KEY_COLS 8
+#define MATRIX_ROW_SHIFT 3
+
+struct mxc_keypad_platform_data {
+
+ const struct matrix_keymap_data *keymap_data;
+
+ /* key debounce interval */
+ unsigned int debounce_ms;
+};
+
+#endif /* __MACH_MXC_KEYPAD_H */
@@ -292,6 +292,15 @@ config KEYBOARD_MAX7359
To compile this driver as a module, choose M here: the
module will be called max7359_keypad.
+config KEYBOARD_MXC
+ tristate "MXC keypad support"
+ depends on ARCH_MXC
+ help
+ Enable support for MXC keypad port.
+
+ To compile this driver as a module, choose M here: the
+ module will be called mxc_keypad.
+
config KEYBOARD_NEWTON
tristate "Newton keyboard"
select SERIO
@@ -25,6 +25,7 @@ obj-$(CONFIG_KEYBOARD_LOCOMO) += locomokbd.o
obj-$(CONFIG_KEYBOARD_MAPLE) += maple_keyb.o
obj-$(CONFIG_KEYBOARD_MATRIX) += matrix_keypad.o
obj-$(CONFIG_KEYBOARD_MAX7359) += max7359_keypad.o
+obj-$(CONFIG_KEYBOARD_MXC) += mxc_keypad.o
obj-$(CONFIG_KEYBOARD_NEWTON) += newtonkbd.o
obj-$(CONFIG_KEYBOARD_OMAP) += omap-keypad.o
obj-$(CONFIG_KEYBOARD_OPENCORES) += opencores-kbd.o
new file mode 100644
@@ -0,0 +1,511 @@
+/*
+ * Driver for the MXC keypad port.
+ * Copyright (C) 2009 Alberto Panizzo <maramaopercheseimorto@gmail.com>
+ * based on Rodolfo Giometti work in pxa27x_keypad.c
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * >>Power management need to be implemented<<.
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/input/matrix_keypad.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/jiffies.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/timer.h>
+
+#include <mach/mxc_keypad.h>
+
+/*
+ * Keypad Controller registers (halfword)
+ */
+#define KPCR 0x00 /* Keypad Control Register */
+
+#define KPSR 0x02 /* Keypad Status Register */
+#define KBD_STAT_KPKD (0x1 << 0) /* Key Press Interrupt Status bit */
+#define KBD_STAT_KPKR (0x1 << 1) /* Key Release Interrupt Status bit */
+#define KBD_STAT_KDSC (0x1 << 2) /* Key Depress Synch Chain Status bit */
+#define KBD_STAT_KRSS (0x1 << 3) /* Key Release Synch Status bit */
+#define KBD_STAT_KDIE (0x1 << 8) /* Key Depress Interrupt Enable Status bit */
+#define KBD_STAT_KRIE (0x1 << 9) /* Key Release Interrupt Enable */
+#define KBD_STAT_KPPEN (0x1 << 10) /* Keypad Clock Enable */
+
+#define KDDR 0x04 /* Keypad Data Direction Register */
+#define KPDR 0x06 /* Keypad Data Register */
+
+#define MAX_MATRIX_KEY_NUM (MAX_MATRIX_KEY_ROWS * MAX_MATRIX_KEY_COLS)
+
+struct mxc_keypad {
+ struct mxc_keypad_platform_data *pdata;
+
+ struct clk *clk;
+ struct input_dev *input_dev;
+ void __iomem *mmio_base;
+
+ int irq;
+ struct timer_list scan_timer;
+ struct timer_list relax_timer;
+
+#define MXC_IRQ_KDI 1
+#define MXC_IRQ_KRI 2
+ unsigned int irq_type;
+ int irq_since_last_change;
+
+ /* Masks for enabled rows/cols */
+ unsigned short rows_en_mask;
+ unsigned short cols_en_mask;
+
+ unsigned short keycodes[MAX_MATRIX_KEY_NUM];
+
+ /* state row bits of each column scan */
+ unsigned short matrix_key_state[MAX_MATRIX_KEY_COLS];
+};
+
+/* Return 0 if no changes are detected in matrix */
+static int mxc_keypad_scan_matrix(struct mxc_keypad *keypad)
+{
+ struct input_dev *input_dev = keypad->input_dev;
+ int row, col, changed = 0;
+ unsigned short new_state[MAX_MATRIX_KEY_COLS];
+ unsigned short reg_val;
+
+ memset(new_state, 0, sizeof(new_state));
+
+ for (col = 0; col < MAX_MATRIX_KEY_COLS; col++) {
+ if ((keypad->cols_en_mask & (1 << col)) == 0)
+ continue;
+ /* Discharge keypad capacitance:
+ * 2. write 1s on column data.
+ * 3. configure columns as totem-pole to discharge capacitance.
+ * 4. configure columns as open-drain.*/
+ reg_val = readw(keypad->mmio_base + KPDR);
+ reg_val |= 0xff00;
+ writew(reg_val, keypad->mmio_base + KPDR);
+
+ reg_val = readw(keypad->mmio_base + KPCR);
+ reg_val &= ~((keypad->cols_en_mask & 0xff) << 8);
+ writew(reg_val, keypad->mmio_base + KPCR);
+
+ udelay(2);
+
+ reg_val = readw(keypad->mmio_base + KPCR);
+ reg_val |= (keypad->cols_en_mask & 0xff) << 8;
+ writew(reg_val, keypad->mmio_base + KPCR);
+
+ /*
+ * 5. Write a single column to 0, others to 1.
+ * 6. Sample row inputs and save data.
+ * 7. Repeat steps 2 - 6 for remaining columns.
+ */
+ reg_val = readw(keypad->mmio_base + KPDR);
+ reg_val &= ~(1 << (8 + col));
+ writew(reg_val, keypad->mmio_base + KPDR);
+
+ /* Delay added to avoid propagating the 0 from column to row
+ * when scanning. */
+ udelay(5);
+
+ /* 1s in state detect a key pressure */
+ new_state[col] = (~readw(keypad->mmio_base + KPDR)) & 0x00ff;
+ }
+
+ /* Test the state changes */
+ for (col = 0; col < MAX_MATRIX_KEY_COLS; col++) {
+ unsigned short bits_changed;
+ int code;
+
+ if ((keypad->cols_en_mask & (1 << col)) == 0)
+ continue;
+
+ bits_changed = keypad->matrix_key_state[col] ^ new_state[col];
+ if (bits_changed == 0)
+ continue;
+
+ changed = 1;
+ for (row = 0; row < MAX_MATRIX_KEY_ROWS; row++) {
+ if ((keypad->rows_en_mask & (1 << row)) == 0)
+ continue;
+ if ((bits_changed & (1 << row)) == 0)
+ continue;
+
+ code = MATRIX_SCAN_CODE(row, col, MATRIX_ROW_SHIFT);
+ input_event(input_dev, EV_MSC, MSC_SCAN, code);
+ input_report_key(input_dev, keypad->keycodes[code],
+ new_state[col] & (1 << row));
+ dev_dbg(&input_dev->dev, "Event code: %d, val: %d",
+ keypad->keycodes[code],
+ new_state[col] & (1 << row));
+ }
+ }
+ input_sync(input_dev);
+ memcpy(keypad->matrix_key_state, new_state, sizeof(new_state));
+
+ /* Return in standby mode:
+ * 9. write 0s to columns */
+ reg_val = readw(keypad->mmio_base + KPDR);
+ reg_val &= 0x00ff;
+ writew(reg_val, keypad->mmio_base + KPDR);
+
+ return changed;
+}
+
+static void mxc_keypad_relax_timer_handler(unsigned long data)
+{
+ struct mxc_keypad *keypad = (struct mxc_keypad *) data;
+ unsigned short reg_val;
+
+ /* 10. Clear KPKD and KPKR status bits
+ * Set the KPKR sync chain and clear the KPKD sync chain */
+ reg_val = readw(keypad->mmio_base + KPSR);
+ reg_val |= KBD_STAT_KPKD | KBD_STAT_KPKR |
+ KBD_STAT_KDSC | KBD_STAT_KRSS;
+ writew(reg_val, keypad->mmio_base + KPSR);
+
+ /* Re enable interrupts and clear sync reset bits.
+ * Next KDI is used for detect multiple pressures. */
+ reg_val = readw(keypad->mmio_base + KPSR);
+ reg_val &= ~(KBD_STAT_KDSC | KBD_STAT_KRSS);
+ writew(reg_val, keypad->mmio_base + KPSR);
+
+ reg_val |= KBD_STAT_KDIE | KBD_STAT_KRIE;
+ if (keypad->irq_type == MXC_IRQ_KRI)
+ reg_val &= ~KBD_STAT_KRIE;
+ writew(reg_val, keypad->mmio_base + KPSR);
+}
+
+static void mxc_keypad_scan_timer_handler(unsigned long data)
+{
+ struct mxc_keypad *keypad = (struct mxc_keypad *) data;
+ struct input_dev *idev = keypad->input_dev;
+
+ dev_dbg(&idev->dev, "handling Interrupt of type %x\n",
+ keypad->irq_type);
+
+ /* Do the scan routine and Keep track for how many time we got
+ * interrupt that make no change */
+ if (mxc_keypad_scan_matrix(keypad))
+ keypad->irq_since_last_change = 0;
+ else
+ keypad->irq_since_last_change++;
+
+ /* If the key is pressed since too many time, relax the update period */
+ if (keypad->irq_since_last_change > 2)
+ mod_timer(&keypad->relax_timer,
+ jiffies + msecs_to_jiffies(60));
+ else
+ mxc_keypad_relax_timer_handler((unsigned long) keypad);
+}
+
+static irqreturn_t mxc_keypad_irq_handler(int irq, void *dev_id)
+{
+ struct mxc_keypad *keypad = dev_id;
+ struct mxc_keypad_platform_data *pdata = keypad->pdata;
+ unsigned short reg_val;
+
+ /* Disable every keypad interrupt */
+ reg_val = readw(keypad->mmio_base + KPSR);
+ reg_val &= ~(KBD_STAT_KRIE | KBD_STAT_KDIE);
+ writew(reg_val, keypad->mmio_base + KPSR);
+
+ keypad->irq_type = reg_val & KBD_STAT_KPKD ?
+ MXC_IRQ_KDI : MXC_IRQ_KRI;
+
+ /* Schedule the scanning procedure */
+ mod_timer(&keypad->scan_timer,
+ jiffies + msecs_to_jiffies(pdata->debounce_ms));
+
+ return IRQ_HANDLED;
+}
+
+static void mxc_keypad_config(struct mxc_keypad *keypad)
+{
+ unsigned short reg_val;
+
+ /* Enable number of rows in keypad (KPCR[7:0])
+ * Configure keypad columns as open-drain (KPCR[15:8])
+ */
+ reg_val = readw(keypad->mmio_base + KPCR);
+ reg_val |= keypad->rows_en_mask & 0xff; /* rows */
+ reg_val |= (keypad->cols_en_mask & 0xff) << 8; /* cols */
+ writew(reg_val, keypad->mmio_base + KPCR);
+
+ /* Write 0's to KPDR[15:8] (Colums)*/
+ reg_val = readw(keypad->mmio_base + KPDR);
+ reg_val &= 0x00ff;
+ writew(reg_val, keypad->mmio_base + KPDR);
+
+ /* Configure columns as output, rows as input (KDDR[15:0]) */
+ writew(0xff00, keypad->mmio_base + KDDR);
+
+ /* Clear Key Depress and Key Release status bit.
+ * Clear synchronizer chain.
+ * */
+ reg_val = readw(keypad->mmio_base + KPSR);
+ reg_val |= KBD_STAT_KPKR | KBD_STAT_KPKD |
+ KBD_STAT_KDSC | KBD_STAT_KRSS;
+ writew(reg_val, keypad->mmio_base + KPSR);
+
+ /* Set the KDIE control bit, and clear the KRIE control bit
+ * (avoid false release events). */
+ reg_val |= KBD_STAT_KDIE;
+ reg_val &= ~KBD_STAT_KRIE;
+ writew(reg_val, keypad->mmio_base + KPSR);
+}
+
+static void mxc_keypad_inhibit(struct mxc_keypad *keypad)
+{
+ unsigned short reg_val;
+
+ /* Colums as open drain and disable rows */
+ writew(0xff00, keypad->mmio_base + KPCR);
+
+ /* Clear the KPKD status flag and synchronizer chain.
+ * Clear KDIE control bit and KRIE control bit.
+ */
+ reg_val = readw(keypad->mmio_base + KPSR);
+ reg_val |= KBD_STAT_KPKD | KBD_STAT_KDSC;
+ reg_val &= ~(KBD_STAT_KRIE | KBD_STAT_KDIE);
+ writew(reg_val, keypad->mmio_base + KPSR);
+}
+
+static int mxc_keypad_open(struct input_dev *dev)
+{
+ struct mxc_keypad *keypad = input_get_drvdata(dev);
+
+ dev_dbg(&dev->dev, "%s\n", __func__);
+
+ /* Enable unit clock */
+ clk_enable(keypad->clk);
+ mxc_keypad_config(keypad);
+
+ /* Sanity control, not all the rows must be to 0s now. */
+ if ((readw(keypad->mmio_base + KPDR) & keypad->rows_en_mask) == 0) {
+ dev_err(&dev->dev,
+ "too much keys pressed for now, control pins initialisation\n");
+ goto open_err;
+ }
+
+ return 0;
+
+open_err:
+ mxc_keypad_inhibit(keypad);
+ return -EIO;
+}
+
+static void mxc_keypad_close(struct input_dev *dev)
+{
+ struct mxc_keypad *keypad = input_get_drvdata(dev);
+
+ dev_dbg(&dev->dev, "%s\n", __func__);
+
+ mxc_keypad_inhibit(keypad);
+
+ /* Disable clock unit */
+ clk_disable(keypad->clk);
+}
+
+static int __devinit mxc_keypad_probe(struct platform_device *pdev)
+{
+ struct mxc_keypad_platform_data *pdata = pdev->dev.platform_data;
+ struct mxc_keypad *keypad;
+ struct input_dev *input_dev;
+ struct resource *res;
+ int irq, error, i;
+ const struct matrix_keymap_data *keymap_data;
+
+ if (pdata == NULL) {
+ dev_err(&pdev->dev, "no platform data defined\n");
+ return -EINVAL;
+ }
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0) {
+ dev_err(&pdev->dev, "no irq defined in platform data\n");
+ return -EINVAL;
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (res == NULL) {
+ dev_err(&pdev->dev, "no I/O memory defined in platform data\n");
+ return -EINVAL;
+ }
+
+ res = request_mem_region(res->start, resource_size(res), pdev->name);
+ if (res == NULL) {
+ dev_err(&pdev->dev, "failed to request I/O memory\n");
+ return -EBUSY;
+ }
+
+ input_dev = input_allocate_device();
+ if (!input_dev) {
+ dev_err(&pdev->dev, "failed to allocate the input device\n");
+ error = -ENOMEM;
+ goto failed_rel_mem;
+ }
+
+ keypad = kzalloc(sizeof(struct mxc_keypad), GFP_KERNEL);
+ if (!keypad) {
+ dev_err(&pdev->dev, "not enough memory for driver data\n");
+ error = -ENOMEM;
+ goto failed_free_input;
+ }
+
+ keypad->pdata = pdata;
+ keypad->input_dev = input_dev;
+ keypad->irq = irq;
+
+ keypad->mmio_base = ioremap(res->start, resource_size(res));
+ if (keypad->mmio_base == NULL) {
+ dev_err(&pdev->dev, "failed to remap I/O memory\n");
+ error = -ENOMEM;
+ goto failed_free_priv;
+ }
+
+ keypad->clk = clk_get(&pdev->dev, "kpp");
+ if (IS_ERR(keypad->clk)) {
+ dev_err(&pdev->dev, "failed to get keypad clock\n");
+ error = PTR_ERR(keypad->clk);
+ goto failed_unmap;
+ }
+
+ /*
+ * Search for rows and cols enabled
+ */
+ keymap_data = pdata->keymap_data;
+ for (i = 0; i < keymap_data->keymap_size; i++) {
+ keypad->rows_en_mask |= 1 << KEY_ROW(keymap_data->keymap[i]);
+ keypad->cols_en_mask |= 1 << KEY_COL(keymap_data->keymap[i]);
+ }
+
+ if (keypad->rows_en_mask > ((1 << MAX_MATRIX_KEY_ROWS) - 1) ||
+ keypad->cols_en_mask > ((1 << MAX_MATRIX_KEY_COLS) - 1)) {
+ dev_err(&pdev->dev, "invalid key data (too rows or colums)\n");
+ error = -EINVAL;
+ goto failed_clock_put;
+ }
+ dev_dbg(&pdev->dev, "enabled rows mask: %x\n", keypad->rows_en_mask);
+ dev_dbg(&pdev->dev, "enabled cols mask: %x\n", keypad->cols_en_mask);
+
+ /* Init Keypad timers */
+ init_timer(&keypad->scan_timer);
+ keypad->scan_timer.function = mxc_keypad_scan_timer_handler;
+ keypad->scan_timer.data = (unsigned long) keypad;
+
+ init_timer(&keypad->relax_timer);
+ keypad->relax_timer.function = mxc_keypad_relax_timer_handler;
+ keypad->relax_timer.data = (unsigned long) keypad;
+
+ /* Init the Input device */
+ input_dev->name = pdev->name;
+ input_dev->id.bustype = BUS_HOST;
+ input_dev->dev.parent = &pdev->dev;
+ input_dev->open = mxc_keypad_open;
+ input_dev->close = mxc_keypad_close;
+ input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
+ input_dev->keycode = keypad->keycodes;
+ input_dev->keycodesize = sizeof(keypad->keycodes[0]);
+ input_dev->keycodemax = ARRAY_SIZE(keypad->keycodes);
+
+ matrix_keypad_build_keymap(pdata->keymap_data, MATRIX_ROW_SHIFT,
+ keypad->keycodes, input_dev->keybit);
+
+ input_set_capability(input_dev, EV_MSC, MSC_SCAN);
+ input_set_drvdata(input_dev, keypad);
+
+ error = request_irq(irq, mxc_keypad_irq_handler, IRQF_DISABLED,
+ pdev->name, keypad);
+ if (error) {
+ dev_err(&pdev->dev, "failed to request IRQ\n");
+ goto failed_clock_put;
+ }
+
+ /* Register the input device */
+ error = input_register_device(input_dev);
+ if (error) {
+ dev_err(&pdev->dev, "failed to register input device\n");
+ goto failed_free_irq;
+ }
+
+ platform_set_drvdata(pdev, keypad);
+ device_init_wakeup(&pdev->dev, 1);
+
+ dev_info(&pdev->dev, "device probed\n");
+
+ return 0;
+
+failed_free_irq:
+ free_irq(irq, pdev);
+failed_clock_put:
+ clk_put(keypad->clk);
+failed_unmap:
+ iounmap(keypad->mmio_base);
+failed_free_priv:
+ kfree(keypad);
+failed_free_input:
+ input_free_device(input_dev);
+failed_rel_mem:
+ release_mem_region(res->start, resource_size(res));
+ return error;
+}
+
+static int __devexit mxc_keypad_remove(struct platform_device *pdev)
+{
+ struct mxc_keypad *keypad = platform_get_drvdata(pdev);
+ struct resource *res;
+
+ platform_set_drvdata(pdev, NULL);
+
+ free_irq(keypad->irq, keypad);
+ clk_put(keypad->clk);
+ del_timer_sync(&keypad->scan_timer);
+ del_timer_sync(&keypad->relax_timer);
+
+ input_unregister_device(keypad->input_dev);
+
+ iounmap(keypad->mmio_base);
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ release_mem_region(res->start, resource_size(res));
+
+ kfree(keypad);
+
+ dev_info(&pdev->dev, "device removed\n");
+
+ return 0;
+}
+
+static struct platform_driver mxc_keypad_driver = {
+ .driver = {
+ .name = "mxc-keypad",
+ .owner = THIS_MODULE,
+ },
+ .probe = mxc_keypad_probe,
+ .remove = __devexit_p(mxc_keypad_remove),
+};
+
+static int __init mxc_keypad_init(void)
+{
+ return platform_driver_register(&mxc_keypad_driver);
+}
+
+static void __exit mxc_keypad_exit(void)
+{
+ platform_driver_unregister(&mxc_keypad_driver);
+}
+
+module_init(mxc_keypad_init);
+module_exit(mxc_keypad_exit);
+
+MODULE_AUTHOR("Alberto Panizzo <maramaopercheseimorto@gmail.com>");
+MODULE_DESCRIPTION("MXC Keypad Port Driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:mxc-keypad");