input: add driver for tnetv107x on-chip keypad controller

This patch adds support for tnetv107x's on-chip keypad controller.

Signed-off-by: Cyril Chemparathy <cyril@ti.com>
Acked-by: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>

3 files changed, 350 insertions, 0 deletions

diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
index 9cc488d21490..df1facb0386a 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_TNETV107X
+        tristate "TI TNETV107X keypad support"
+        depends on ARCH_DAVINCI_TNETV107X
+        help
+          Say Y here if you want to use the TNETV107X keypad.
+
+          To compile this driver as a module, choose M here: the
+          module will be called tnetv107x-keypad.
+
 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 504b591be0cd..dc0451824dbf 100644
--- a/drivers/input/keyboard/Makefile
+++ b/drivers/input/keyboard/Makefile
@@ -38,6 +38,7 @@ obj-$(CONFIG_KEYBOARD_SH_KEYSC)		+= sh_keysc.o
 obj-$(CONFIG_KEYBOARD_STMPE)            += stmpe-keypad.o
 obj-$(CONFIG_KEYBOARD_STOWAWAY)         += stowaway.o
 obj-$(CONFIG_KEYBOARD_SUNKBD)           += sunkbd.o
+obj-$(CONFIG_KEYBOARD_TNETV107X)        += tnetv107x-keypad.o
 obj-$(CONFIG_KEYBOARD_TWL4030)          += twl4030_keypad.o
 obj-$(CONFIG_KEYBOARD_XTKBD)            += xtkbd.o
 obj-$(CONFIG_KEYBOARD_W90P910)          += w90p910_keypad.o
diff --git a/drivers/input/keyboard/tnetv107x-keypad.c b/drivers/input/keyboard/tnetv107x-keypad.c
new file mode 100644
index 000000000000..b4a81ebfab92
--- /dev/null
+++ b/drivers/input/keyboard/tnetv107x-keypad.c
@@ -0,0 +1,340 @@
+/*
+ * Texas Instruments TNETV107X Keypad Driver
+ *
+ * Copyright (C) 2010 Texas Instruments
+ *
+ * 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 version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/input.h>
+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/clk.h>
+#include <linux/input/matrix_keypad.h>
+
+#define BITS(x)                 (BIT(x) - 1)
+
+#define KEYPAD_ROWS             9
+#define KEYPAD_COLS             9
+
+#define DEBOUNCE_MIN            0x400ul
+#define DEBOUNCE_MAX            0x3ffffffful
+
+struct keypad_regs {
+        u32     rev;
+        u32     mode;
+        u32     mask;
+        u32     pol;
+        u32     dclock;
+        u32     rclock;
+        u32     stable_cnt;
+        u32     in_en;
+        u32     out;
+        u32     out_en;
+        u32     in;
+        u32     lock;
+        u32     pres[3];
+};
+
+#define keypad_read(kp, reg)            __raw_readl(&(kp)->regs->reg)
+#define keypad_write(kp, reg, val)      __raw_writel(val, &(kp)->regs->reg)
+
+struct keypad_data {
+        struct input_dev                *input_dev;
+        struct resource                 *res;
+        struct keypad_regs __iomem      *regs;
+        struct clk                      *clk;
+        struct device                   *dev;
+        spinlock_t                      lock;
+        u32                             irq_press;
+        u32                             irq_release;
+        int                             rows, cols, row_shift;
+        int                             debounce_ms, active_low;
+        u32                             prev_keys[3];
+        unsigned short                  keycodes[];
+};
+
+static irqreturn_t keypad_irq(int irq, void *data)
+{
+        struct keypad_data *kp = data;
+        int i, bit, val, row, col, code;
+        unsigned long flags;
+        u32 curr_keys[3];
+        u32 change;
+
+        spin_lock_irqsave(&kp->lock, flags);
+
+        memset(curr_keys, 0, sizeof(curr_keys));
+        if (irq == kp->irq_press)
+                for (i = 0; i < 3; i++)
+                        curr_keys[i] = keypad_read(kp, pres[i]);
+
+        for (i = 0; i < 3; i++) {
+                change = curr_keys[i] ^ kp->prev_keys[i];
+
+                while (change) {
+                        bit     = fls(change) - 1;
+                        change ^= BIT(bit);
+                        val     = curr_keys[i] & BIT(bit);
+                        bit    += i * 32;
+                        row     = bit / KEYPAD_COLS;
+                        col     = bit % KEYPAD_COLS;
+
+                        code = MATRIX_SCAN_CODE(row, col, kp->row_shift);
+                        input_event(kp->input_dev, EV_MSC, MSC_SCAN, code);
+                        input_report_key(kp->input_dev, kp->keycodes[code],
+                                         val);
+                }
+        }
+        input_sync(kp->input_dev);
+        memcpy(kp->prev_keys, curr_keys, sizeof(curr_keys));
+
+        if (irq == kp->irq_press)
+                keypad_write(kp, lock, 0); /* Allow hardware updates */
+
+        spin_unlock_irqrestore(&kp->lock, flags);
+
+        return IRQ_HANDLED;
+}
+
+static int keypad_start(struct input_dev *dev)
+{
+        struct keypad_data *kp = input_get_drvdata(dev);
+        unsigned long mask, debounce, clk_rate_khz;
+        unsigned long flags;
+
+        clk_enable(kp->clk);
+        clk_rate_khz = clk_get_rate(kp->clk) / 1000;
+
+        spin_lock_irqsave(&kp->lock, flags);
+
+        /* Initialize device registers */
+        keypad_write(kp, mode, 0);
+
+        mask  = BITS(kp->rows) << KEYPAD_COLS;
+        mask |= BITS(kp->cols);
+        keypad_write(kp, mask, ~mask);
+
+        keypad_write(kp, pol, kp->active_low ? 0 : 0x3ffff);
+        keypad_write(kp, stable_cnt, 3);
+
+        debounce = kp->debounce_ms * clk_rate_khz;
+        debounce = clamp(debounce, DEBOUNCE_MIN, DEBOUNCE_MAX);
+        keypad_write(kp, dclock, debounce);
+        keypad_write(kp, rclock, 4 * debounce);
+
+        keypad_write(kp, in_en, 1);
+
+        spin_unlock_irqrestore(&kp->lock, flags);
+
+        return 0;
+}
+
+static void keypad_stop(struct input_dev *dev)
+{
+        struct keypad_data *kp = input_get_drvdata(dev);
+
+        synchronize_irq(kp->irq_press);
+        synchronize_irq(kp->irq_release);
+        clk_disable(kp->clk);
+}
+
+static int __devinit keypad_probe(struct platform_device *pdev)
+{
+        const struct matrix_keypad_platform_data *pdata;
+        const struct matrix_keymap_data *keymap_data;
+        struct device *dev = &pdev->dev;
+        struct keypad_data *kp;
+        int error = 0, sz, row_shift;
+        u32 rev = 0;
+
+        pdata = pdev->dev.platform_data;
+        if (!pdata) {
+                dev_err(dev, "cannot find device data\n");
+                return -EINVAL;
+        }
+
+        keymap_data = pdata->keymap_data;
+        if (!keymap_data) {
+                dev_err(dev, "cannot find keymap data\n");
+                return -EINVAL;
+        }
+
+        row_shift = get_count_order(pdata->num_col_gpios);
+        sz  = offsetof(struct keypad_data, keycodes);
+        sz += (pdata->num_row_gpios << row_shift) * sizeof(kp->keycodes[0]);
+        kp = kzalloc(sz, GFP_KERNEL);
+        if (!kp) {
+                dev_err(dev, "cannot allocate device info\n");
+                return -ENOMEM;
+        }
+
+        kp->dev  = dev;
+        kp->rows = pdata->num_row_gpios;
+        kp->cols = pdata->num_col_gpios;
+        kp->row_shift = row_shift;
+        platform_set_drvdata(pdev, kp);
+        spin_lock_init(&kp->lock);
+
+        kp->irq_press   = platform_get_irq_byname(pdev, "press");
+        kp->irq_release = platform_get_irq_byname(pdev, "release");
+        if (kp->irq_press < 0 || kp->irq_release < 0) {
+                dev_err(dev, "cannot determine device interrupts\n");
+                error = -ENODEV;
+                goto error_res;
+        }
+
+        kp->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!kp->res) {
+                dev_err(dev, "cannot determine register area\n");
+                error = -ENODEV;
+                goto error_res;
+        }
+
+        if (!request_mem_region(kp->res->start, resource_size(kp->res),
+                                pdev->name)) {
+                dev_err(dev, "cannot claim register memory\n");
+                kp->res = NULL;
+                error = -EINVAL;
+                goto error_res;
+        }
+
+        kp->regs = ioremap(kp->res->start, resource_size(kp->res));
+        if (!kp->regs) {
+                dev_err(dev, "cannot map register memory\n");
+                error = -ENOMEM;
+                goto error_map;
+        }
+
+        kp->clk = clk_get(dev, NULL);
+        if (!kp->clk) {
+                dev_err(dev, "cannot claim device clock\n");
+                error = -EINVAL;
+                goto error_clk;
+        }
+
+        error = request_threaded_irq(kp->irq_press, NULL, keypad_irq, 0,
+                                     dev_name(dev), kp);
+        if (error < 0) {
+                dev_err(kp->dev, "Could not allocate keypad press key irq\n");
+                goto error_irq_press;
+        }
+
+        error = request_threaded_irq(kp->irq_release, NULL, keypad_irq, 0,
+                                     dev_name(dev), kp);
+        if (error < 0) {
+                dev_err(kp->dev, "Could not allocate keypad release key irq\n");
+                goto error_irq_release;
+        }
+
+        kp->input_dev = input_allocate_device();
+        if (!kp->input_dev) {
+                dev_err(dev, "cannot allocate input device\n");
+                error = -ENOMEM;
+                goto error_input;
+        }
+        input_set_drvdata(kp->input_dev, kp);
+
+        kp->input_dev->name       = pdev->name;
+        kp->input_dev->dev.parent = &pdev->dev;
+        kp->input_dev->open       = keypad_start;
+        kp->input_dev->close      = keypad_stop;
+        kp->input_dev->evbit[0]   = BIT_MASK(EV_KEY);
+        if (!pdata->no_autorepeat)
+                kp->input_dev->evbit[0] |= BIT_MASK(EV_REP);
+
+        clk_enable(kp->clk);
+        rev = keypad_read(kp, rev);
+        kp->input_dev->id.bustype = BUS_HOST;
+        kp->input_dev->id.product = ((rev >>  8) & 0x07);
+        kp->input_dev->id.version = ((rev >> 16) & 0xfff);
+        clk_disable(kp->clk);
+
+        kp->input_dev->keycode     = kp->keycodes;
+        kp->input_dev->keycodesize = sizeof(kp->keycodes[0]);
+        kp->input_dev->keycodemax  = kp->rows << kp->row_shift;
+
+        matrix_keypad_build_keymap(keymap_data, kp->row_shift, kp->keycodes,
+                                   kp->input_dev->keybit);
+
+        input_set_capability(kp->input_dev, EV_MSC, MSC_SCAN);
+
+        error = input_register_device(kp->input_dev);
+        if (error < 0) {
+                dev_err(dev, "Could not register input device\n");
+                goto error_reg;
+        }
+
+        return 0;
+
+
+error_reg:
+        input_free_device(kp->input_dev);
+error_input:
+        free_irq(kp->irq_release, kp);
+error_irq_release:
+        free_irq(kp->irq_press, kp);
+error_irq_press:
+        clk_put(kp->clk);
+error_clk:
+        iounmap(kp->regs);
+error_map:
+        release_mem_region(kp->res->start, resource_size(kp->res));
+error_res:
+        platform_set_drvdata(pdev, NULL);
+        kfree(kp);
+        return error;
+}
+
+static int __devexit keypad_remove(struct platform_device *pdev)
+{
+        struct keypad_data *kp = platform_get_drvdata(pdev);
+
+        free_irq(kp->irq_press, kp);
+        free_irq(kp->irq_release, kp);
+        input_unregister_device(kp->input_dev);
+        clk_put(kp->clk);
+        iounmap(kp->regs);
+        release_mem_region(kp->res->start, resource_size(kp->res));
+        platform_set_drvdata(pdev, NULL);
+        kfree(kp);
+
+        return 0;
+}
+
+static struct platform_driver keypad_driver = {
+        .probe          = keypad_probe,
+        .remove         = __devexit_p(keypad_remove),
+        .driver.name    = "tnetv107x-keypad",
+        .driver.owner   = THIS_MODULE,
+};
+
+static int __init keypad_init(void)
+{
+        return platform_driver_register(&keypad_driver);
+}
+
+static void __exit keypad_exit(void)
+{
+        platform_driver_unregister(&keypad_driver);
+}
+
+module_init(keypad_init);
+module_exit(keypad_exit);
+
+MODULE_AUTHOR("Cyril Chemparathy");
+MODULE_DESCRIPTION("TNETV107X Keypad Driver");
+MODULE_ALIAS("platform: tnetv107x-keypad");
+MODULE_LICENSE("GPL");