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path: root/drivers/input/keyboard/adp5520-keys.c
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-rw-r--r--drivers/input/keyboard/adp5520-keys.c193
1 files changed, 193 insertions, 0 deletions
diff --git a/drivers/input/keyboard/adp5520-keys.c b/drivers/input/keyboard/adp5520-keys.c
new file mode 100644
index 000000000..7851ffd67
--- /dev/null
+++ b/drivers/input/keyboard/adp5520-keys.c
@@ -0,0 +1,193 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Keypad driver for Analog Devices ADP5520 MFD PMICs
+ *
+ * Copyright 2009 Analog Devices Inc.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/input.h>
+#include <linux/mfd/adp5520.h>
+#include <linux/slab.h>
+#include <linux/device.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 adp5520_keys_probe(struct platform_device *pdev)
+{
+ struct adp5520_keys_platform_data *pdata = dev_get_platdata(&pdev->dev);
+ 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) {
+ dev_err(&pdev->dev, "missing platform data\n");
+ return -EINVAL;
+ }
+
+ if (!(pdata->rows_en_mask && pdata->cols_en_mask))
+ return -EINVAL;
+
+ dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
+ if (!dev) {
+ dev_err(&pdev->dev, "failed to alloc memory\n");
+ return -ENOMEM;
+ }
+
+ input = devm_input_allocate_device(&pdev->dev);
+ if (!input)
+ return -ENOMEM;
+
+ dev->master = pdev->dev.parent;
+ dev->input = input;
+
+ input->name = pdev->name;
+ input->phys = "adp5520-keys/input0";
+ input->dev.parent = &pdev->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");
+ return ret;
+ }
+
+ 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");
+ return -EIO;
+ }
+
+ 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");
+ return ret;
+ }
+
+ platform_set_drvdata(pdev, dev);
+ return 0;
+}
+
+static int 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);
+
+ return 0;
+}
+
+static struct platform_driver adp5520_keys_driver = {
+ .driver = {
+ .name = "adp5520-keys",
+ },
+ .probe = adp5520_keys_probe,
+ .remove = adp5520_keys_remove,
+};
+module_platform_driver(adp5520_keys_driver);
+
+MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
+MODULE_DESCRIPTION("Keys ADP5520 Driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:adp5520-keys");