input/keyboard: new driver for ADP5520 MFD PMICs

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Acked-by: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

3 files changed, 231 insertions, 0 deletions

diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
index 203b88a82b5..02c836e1181 100644
--- a/drivers/input/keyboard/Kconfig
+++ b/drivers/input/keyboard/Kconfig
@@ -24,6 +24,16 @@ config KEYBOARD_AAED2000
           To compile this driver as a module, choose M here: the
           module will be called aaed2000_kbd.
 
+config KEYBOARD_ADP5520
+        tristate "Keypad Support for ADP5520 PMIC"
+        depends on PMIC_ADP5520
+        help
+          This option enables support for the keypad scan matrix
+          on Analog Devices ADP5520 PMICs.
+
+          To compile this driver as a module, choose M here: the module will
+          be called adp5520-keys.
+
 config KEYBOARD_ADP5588
         tristate "ADP5588 I2C QWERTY Keypad and IO Expander"
         depends on I2C
diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile
index 68c017235ce..78654ef6520 100644
--- a/drivers/input/keyboard/Makefile
+++ b/drivers/input/keyboard/Makefile
@@ -5,6 +5,7 @@
 # Each configuration option enables a list of files.
 
 obj-$(CONFIG_KEYBOARD_AAED2000)         += aaed2000_kbd.o
+obj-$(CONFIG_KEYBOARD_ADP5520)          += adp5520-keys.o
 obj-$(CONFIG_KEYBOARD_ADP5588)          += adp5588-keys.o
 obj-$(CONFIG_KEYBOARD_AMIGA)            += amikbd.o
 obj-$(CONFIG_KEYBOARD_ATARI)            += atakbd.o
diff --git a/drivers/input/keyboard/adp5520-keys.c b/drivers/input/keyboard/adp5520-keys.c
new file mode 100644
index 00000000000..a7ba27fb410
--- /dev/null
+++ b/drivers/input/keyboard/adp5520-keys.c
@@ -0,0 +1,220 @@
+/*
+ * Keypad driver for Analog Devices ADP5520 MFD PMICs
+ *
+ * Copyright 2009 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/input.h>
+#include <linux/mfd/adp5520.h>
+
+struct adp5520_keys {
+        struct input_dev *input;
+        struct notifier_block notifier;
+        struct device *master;
+        unsigned short keycode[ADP5520_KEYMAPSIZE];
+};
+
+static void adp5520_keys_report_event(struct adp5520_keys *dev,
+                                        unsigned short keymask, int value)
+{
+        int i;
+
+        for (i = 0; i < ADP5520_MAXKEYS; i++)
+                if (keymask & (1 << i))
+                        input_report_key(dev->input, dev->keycode[i], value);
+
+        input_sync(dev->input);
+}
+
+static int adp5520_keys_notifier(struct notifier_block *nb,
+                                 unsigned long event, void *data)
+{
+        struct adp5520_keys *dev;
+        uint8_t reg_val_lo, reg_val_hi;
+        unsigned short keymask;
+
+        dev = container_of(nb, struct adp5520_keys, notifier);
+
+        if (event & ADP5520_KP_INT) {
+                adp5520_read(dev->master, ADP5520_KP_INT_STAT_1, &reg_val_lo);
+                adp5520_read(dev->master, ADP5520_KP_INT_STAT_2, &reg_val_hi);
+
+                keymask = (reg_val_hi << 8) | reg_val_lo;
+                /* Read twice to clear */
+                adp5520_read(dev->master, ADP5520_KP_INT_STAT_1, &reg_val_lo);
+                adp5520_read(dev->master, ADP5520_KP_INT_STAT_2, &reg_val_hi);
+                keymask |= (reg_val_hi << 8) | reg_val_lo;
+                adp5520_keys_report_event(dev, keymask, 1);
+        }
+
+        if (event & ADP5520_KR_INT) {
+                adp5520_read(dev->master, ADP5520_KR_INT_STAT_1, &reg_val_lo);
+                adp5520_read(dev->master, ADP5520_KR_INT_STAT_2, &reg_val_hi);
+
+                keymask = (reg_val_hi << 8) | reg_val_lo;
+                /* Read twice to clear */
+                adp5520_read(dev->master, ADP5520_KR_INT_STAT_1, &reg_val_lo);
+                adp5520_read(dev->master, ADP5520_KR_INT_STAT_2, &reg_val_hi);
+                keymask |= (reg_val_hi << 8) | reg_val_lo;
+                adp5520_keys_report_event(dev, keymask, 0);
+        }
+
+        return 0;
+}
+
+static int __devinit adp5520_keys_probe(struct platform_device *pdev)
+{
+        struct adp5520_keys_platform_data *pdata = pdev->dev.platform_data;
+        struct input_dev *input;
+        struct adp5520_keys *dev;
+        int ret, i;
+        unsigned char en_mask, ctl_mask = 0;
+
+        if (pdev->id != ID_ADP5520) {
+                dev_err(&pdev->dev, "only ADP5520 supports Keypad\n");
+                return -EINVAL;
+        }
+
+        if (pdata == NULL) {
+                dev_err(&pdev->dev, "missing platform data\n");
+                return -EINVAL;
+        }
+
+        if (!(pdata->rows_en_mask && pdata->cols_en_mask))
+                return -EINVAL;
+
+        dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+        if (dev == NULL) {
+                dev_err(&pdev->dev, "failed to alloc memory\n");
+                return -ENOMEM;
+        }
+
+        input = input_allocate_device();
+        if (!input) {
+                ret = -ENOMEM;
+                goto err;
+        }
+
+        dev->master = pdev->dev.parent;
+        dev->input = input;
+
+        input->name = pdev->name;
+        input->phys = "adp5520-keys/input0";
+        input->dev.parent = &pdev->dev;
+
+        input_set_drvdata(input, dev);
+
+        input->id.bustype = BUS_I2C;
+        input->id.vendor = 0x0001;
+        input->id.product = 0x5520;
+        input->id.version = 0x0001;
+
+        input->keycodesize = sizeof(dev->keycode[0]);
+        input->keycodemax = pdata->keymapsize;
+        input->keycode = dev->keycode;
+
+        memcpy(dev->keycode, pdata->keymap,
+                pdata->keymapsize * input->keycodesize);
+
+        /* setup input device */
+        __set_bit(EV_KEY, input->evbit);
+
+        if (pdata->repeat)
+                __set_bit(EV_REP, input->evbit);
+
+        for (i = 0; i < input->keycodemax; i++)
+                __set_bit(dev->keycode[i], input->keybit);
+        __clear_bit(KEY_RESERVED, input->keybit);
+
+        ret = input_register_device(input);
+        if (ret) {
+                dev_err(&pdev->dev, "unable to register input device\n");
+                goto err;
+        }
+
+        en_mask = pdata->rows_en_mask | pdata->cols_en_mask;
+
+        ret = adp5520_set_bits(dev->master, ADP5520_GPIO_CFG_1, en_mask);
+
+        if (en_mask & ADP5520_COL_C3)
+                ctl_mask |= ADP5520_C3_MODE;
+
+        if (en_mask & ADP5520_ROW_R3)
+                ctl_mask |= ADP5520_R3_MODE;
+
+        if (ctl_mask)
+                ret |= adp5520_set_bits(dev->master, ADP5520_LED_CONTROL,
+                        ctl_mask);
+
+        ret |= adp5520_set_bits(dev->master, ADP5520_GPIO_PULLUP,
+                pdata->rows_en_mask);
+
+        if (ret) {
+                dev_err(&pdev->dev, "failed to write\n");
+                ret = -EIO;
+                goto err1;
+        }
+
+        dev->notifier.notifier_call = adp5520_keys_notifier;
+        ret = adp5520_register_notifier(dev->master, &dev->notifier,
+                        ADP5520_KP_IEN | ADP5520_KR_IEN);
+        if (ret) {
+                dev_err(&pdev->dev, "failed to register notifier\n");
+                goto err1;
+        }
+
+        platform_set_drvdata(pdev, dev);
+        return 0;
+
+err1:
+        input_unregister_device(input);
+        input = NULL;
+err:
+        input_free_device(input);
+        kfree(dev);
+        return ret;
+}
+
+static int __devexit adp5520_keys_remove(struct platform_device *pdev)
+{
+        struct adp5520_keys *dev = platform_get_drvdata(pdev);
+
+        adp5520_unregister_notifier(dev->master, &dev->notifier,
+                                ADP5520_KP_IEN | ADP5520_KR_IEN);
+
+        input_unregister_device(dev->input);
+        kfree(dev);
+        return 0;
+}
+
+static struct platform_driver adp5520_keys_driver = {
+        .driver = {
+                .name   = "adp5520-keys",
+                .owner  = THIS_MODULE,
+        },
+        .probe          = adp5520_keys_probe,
+        .remove         = __devexit_p(adp5520_keys_remove),
+};
+
+static int __init adp5520_keys_init(void)
+{
+        return platform_driver_register(&adp5520_keys_driver);
+}
+module_init(adp5520_keys_init);
+
+static void __exit adp5520_keys_exit(void)
+{
+        platform_driver_unregister(&adp5520_keys_driver);
+}
+module_exit(adp5520_keys_exit);
+
+MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
+MODULE_DESCRIPTION("Keys ADP5520 Driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:adp5520-keys");