Input: add driver for ADP5588 QWERTY I2C Keypad

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>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

3 files changed, 372 insertions, 0 deletions

diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
index b14bd3a07140..d615c09a83c6 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_ADP5588
+        tristate "ADP5588 I2C QWERTY Keypad and IO Expander"
+        depends on I2C
+        help
+          Say Y here if you want to use a ADP5588 attached to your
+          system I2C bus.
+
+          To compile this driver as a module, choose M here: the
+          module will be called adp5588-keys.
+
 config KEYBOARD_AMIGA
         tristate "Amiga keyboard"
         depends on AMIGA
diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile
index ab35ac36111e..a5c08cdf8083 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_ADP5588)          += adp5588-keys.o
 obj-$(CONFIG_KEYBOARD_AMIGA)            += amikbd.o
 obj-$(CONFIG_KEYBOARD_ATARI)            += atakbd.o
 obj-$(CONFIG_KEYBOARD_ATKBD)            += atkbd.o
diff --git a/drivers/input/keyboard/adp5588-keys.c b/drivers/input/keyboard/adp5588-keys.c
new file mode 100644
index 000000000000..d48c808d5928
--- /dev/null
+++ b/drivers/input/keyboard/adp5588-keys.c
@@ -0,0 +1,361 @@
+/*
+ * File: drivers/input/keyboard/adp5588_keys.c
+ * Description:  keypad driver for ADP5588 I2C QWERTY Keypad and IO Expander
+ * Bugs: Enter bugs at http://blackfin.uclinux.org/
+ *
+ * Copyright (C) 2008-2009 Analog Devices Inc.
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <linux/module.h>
+#include <linux/version.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/workqueue.h>
+#include <linux/errno.h>
+#include <linux/pm.h>
+#include <linux/platform_device.h>
+#include <linux/input.h>
+#include <linux/i2c.h>
+
+#include <linux/i2c/adp5588.h>
+
+ /* Configuration Register1 */
+#define AUTO_INC        (1 << 7)
+#define GPIEM_CFG       (1 << 6)
+#define OVR_FLOW_M      (1 << 5)
+#define INT_CFG         (1 << 4)
+#define OVR_FLOW_IEN    (1 << 3)
+#define K_LCK_IM        (1 << 2)
+#define GPI_IEN         (1 << 1)
+#define KE_IEN          (1 << 0)
+
+/* Interrupt Status Register */
+#define CMP2_INT        (1 << 5)
+#define CMP1_INT        (1 << 4)
+#define OVR_FLOW_INT    (1 << 3)
+#define K_LCK_INT       (1 << 2)
+#define GPI_INT         (1 << 1)
+#define KE_INT          (1 << 0)
+
+/* Key Lock and Event Counter Register */
+#define K_LCK_EN        (1 << 6)
+#define LCK21           0x30
+#define KEC             0xF
+
+/* Key Event Register xy */
+#define KEY_EV_PRESSED          (1 << 7)
+#define KEY_EV_MASK             (0x7F)
+
+#define KP_SEL(x)               (0xFFFF >> (16 - x))    /* 2^x-1 */
+
+#define KEYP_MAX_EVENT          10
+
+/*
+ * Early pre 4.0 Silicon required to delay readout by at least 25ms,
+ * since the Event Counter Register updated 25ms after the interrupt
+ * asserted.
+ */
+#define WA_DELAYED_READOUT_REVID(rev)           ((rev) < 4)
+
+struct adp5588_kpad {
+        struct i2c_client *client;
+        struct input_dev *input;
+        struct delayed_work work;
+        unsigned long delay;
+        unsigned short keycode[ADP5588_KEYMAPSIZE];
+};
+
+static int adp5588_read(struct i2c_client *client, u8 reg)
+{
+        int ret = i2c_smbus_read_byte_data(client, reg);
+
+        if (ret < 0)
+                dev_err(&client->dev, "Read Error\n");
+
+        return ret;
+}
+
+static int adp5588_write(struct i2c_client *client, u8 reg, u8 val)
+{
+        return i2c_smbus_write_byte_data(client, reg, val);
+}
+
+static void adp5588_work(struct work_struct *work)
+{
+        struct adp5588_kpad *kpad = container_of(work,
+                                                struct adp5588_kpad, work.work);
+        struct i2c_client *client = kpad->client;
+        int i, key, status, ev_cnt;
+
+        status = adp5588_read(client, INT_STAT);
+
+        if (status & OVR_FLOW_INT)      /* Unlikely and should never happen */
+                dev_err(&client->dev, "Event Overflow Error\n");
+
+        if (status & KE_INT) {
+                ev_cnt = adp5588_read(client, KEY_LCK_EC_STAT) & KEC;
+                if (ev_cnt) {
+                        for (i = 0; i < ev_cnt; i++) {
+                                key = adp5588_read(client, Key_EVENTA + i);
+                                input_report_key(kpad->input,
+                                        kpad->keycode[(key & KEY_EV_MASK) - 1],
+                                        key & KEY_EV_PRESSED);
+                        }
+                        input_sync(kpad->input);
+                }
+        }
+        adp5588_write(client, INT_STAT, status); /* Status is W1C */
+}
+
+static irqreturn_t adp5588_irq(int irq, void *handle)
+{
+        struct adp5588_kpad *kpad = handle;
+
+        /*
+         * use keventd context to read the event fifo registers
+         * Schedule readout at least 25ms after notification for
+         * REVID < 4
+         */
+
+        schedule_delayed_work(&kpad->work, kpad->delay);
+
+        return IRQ_HANDLED;
+}
+
+static int __devinit adp5588_setup(struct i2c_client *client)
+{
+        struct adp5588_kpad_platform_data *pdata = client->dev.platform_data;
+        int i, ret;
+
+        ret = adp5588_write(client, KP_GPIO1, KP_SEL(pdata->rows));
+        ret |= adp5588_write(client, KP_GPIO2, KP_SEL(pdata->cols) & 0xFF);
+        ret |= adp5588_write(client, KP_GPIO3, KP_SEL(pdata->cols) >> 8);
+
+        if (pdata->en_keylock) {
+                ret |= adp5588_write(client, UNLOCK1, pdata->unlock_key1);
+                ret |= adp5588_write(client, UNLOCK2, pdata->unlock_key2);
+                ret |= adp5588_write(client, KEY_LCK_EC_STAT, K_LCK_EN);
+        }
+
+        for (i = 0; i < KEYP_MAX_EVENT; i++)
+                ret |= adp5588_read(client, Key_EVENTA);
+
+        ret |= adp5588_write(client, INT_STAT, CMP2_INT | CMP1_INT |
+                                        OVR_FLOW_INT | K_LCK_INT |
+                                        GPI_INT | KE_INT); /* Status is W1C */
+
+        ret |= adp5588_write(client, CFG, INT_CFG | OVR_FLOW_IEN | KE_IEN);
+
+        if (ret < 0) {
+                dev_err(&client->dev, "Write Error\n");
+                return ret;
+        }
+
+        return 0;
+}
+
+static int __devinit adp5588_probe(struct i2c_client *client,
+                                        const struct i2c_device_id *id)
+{
+        struct adp5588_kpad *kpad;
+        struct adp5588_kpad_platform_data *pdata = client->dev.platform_data;
+        struct input_dev *input;
+        unsigned int revid;
+        int ret, i;
+        int error;
+
+        if (!i2c_check_functionality(client->adapter,
+                                        I2C_FUNC_SMBUS_BYTE_DATA)) {
+                dev_err(&client->dev, "SMBUS Byte Data not Supported\n");
+                return -EIO;
+        }
+
+        if (!pdata) {
+                dev_err(&client->dev, "no platform data?\n");
+                return -EINVAL;
+        }
+
+        if (!pdata->rows || !pdata->cols || !pdata->keymap) {
+                dev_err(&client->dev, "no rows, cols or keymap from pdata\n");
+                return -EINVAL;
+        }
+
+        if (pdata->keymapsize != ADP5588_KEYMAPSIZE) {
+                dev_err(&client->dev, "invalid keymapsize\n");
+                return -EINVAL;
+        }
+
+        if (!client->irq) {
+                dev_err(&client->dev, "no IRQ?\n");
+                return -EINVAL;
+        }
+
+        kpad = kzalloc(sizeof(*kpad), GFP_KERNEL);
+        input = input_allocate_device();
+        if (!kpad || !input) {
+                error = -ENOMEM;
+                goto err_free_mem;
+        }
+
+        kpad->client = client;
+        kpad->input = input;
+        INIT_DELAYED_WORK(&kpad->work, adp5588_work);
+
+        ret = adp5588_read(client, DEV_ID);
+        if (ret < 0) {
+                error = ret;
+                goto err_free_mem;
+        }
+
+        revid = (u8) ret & ADP5588_DEVICE_ID_MASK;
+        if (WA_DELAYED_READOUT_REVID(revid))
+                kpad->delay = msecs_to_jiffies(30);
+
+        input->name = client->name;
+        input->phys = "adp5588-keys/input0";
+        input->dev.parent = &client->dev;
+
+        input_set_drvdata(input, kpad);
+
+        input->id.bustype = BUS_I2C;
+        input->id.vendor = 0x0001;
+        input->id.product = 0x0001;
+        input->id.version = revid;
+
+        input->keycodesize = sizeof(kpad->keycode[0]);
+        input->keycodemax = pdata->keymapsize;
+        input->keycode = kpad->keycode;
+
+        memcpy(kpad->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(kpad->keycode[i] & KEY_MAX, input->keybit);
+        __clear_bit(KEY_RESERVED, input->keybit);
+
+        error = input_register_device(input);
+        if (error) {
+                dev_err(&client->dev, "unable to register input device\n");
+                goto err_free_mem;
+        }
+
+        error = request_irq(client->irq, adp5588_irq,
+                            IRQF_TRIGGER_FALLING | IRQF_DISABLED,
+                            client->dev.driver->name, kpad);
+        if (error) {
+                dev_err(&client->dev, "irq %d busy?\n", client->irq);
+                goto err_unreg_dev;
+        }
+
+        error = adp5588_setup(client);
+        if (error)
+                goto err_free_irq;
+
+        device_init_wakeup(&client->dev, 1);
+        i2c_set_clientdata(client, kpad);
+
+        dev_info(&client->dev, "Rev.%d keypad, irq %d\n", revid, client->irq);
+        return 0;
+
+ err_free_irq:
+        free_irq(client->irq, kpad);
+ err_unreg_dev:
+        input_unregister_device(input);
+        input = NULL;
+ err_free_mem:
+        input_free_device(input);
+        kfree(kpad);
+
+        return error;
+}
+
+static int __devexit adp5588_remove(struct i2c_client *client)
+{
+        struct adp5588_kpad *kpad = i2c_get_clientdata(client);
+
+        adp5588_write(client, CFG, 0);
+        free_irq(client->irq, kpad);
+        cancel_delayed_work_sync(&kpad->work);
+        input_unregister_device(kpad->input);
+        i2c_set_clientdata(client, NULL);
+        kfree(kpad);
+
+        return 0;
+}
+
+#ifdef CONFIG_PM
+static int adp5588_suspend(struct device *dev)
+{
+        struct adp5588_kpad *kpad = dev_get_drvdata(dev);
+        struct i2c_client *client = kpad->client;
+
+        disable_irq(client->irq);
+        cancel_delayed_work_sync(&kpad->work);
+
+        if (device_may_wakeup(&client->dev))
+                enable_irq_wake(client->irq);
+
+        return 0;
+}
+
+static int adp5588_resume(struct device *dev)
+{
+        struct adp5588_kpad *kpad = dev_get_drvdata(dev);
+        struct i2c_client *client = kpad->client;
+
+        if (device_may_wakeup(&client->dev))
+                disable_irq_wake(client->irq);
+
+        enable_irq(client->irq);
+
+        return 0;
+}
+
+static struct dev_pm_ops adp5588_dev_pm_ops = {
+        .suspend = adp5588_suspend,
+        .resume  = adp5588_resume,
+};
+#endif
+
+static const struct i2c_device_id adp5588_id[] = {
+        { KBUILD_MODNAME, 0 },
+        { }
+};
+MODULE_DEVICE_TABLE(i2c, adp5588_id);
+
+static struct i2c_driver adp5588_driver = {
+        .driver = {
+                .name = KBUILD_MODNAME,
+#ifdef CONFIG_PM
+                .pm   = &adp5588_dev_pm_ops,
+#endif
+        },
+        .probe    = adp5588_probe,
+        .remove   = __devexit_p(adp5588_remove),
+        .id_table = adp5588_id,
+};
+
+static int __init adp5588_init(void)
+{
+        return i2c_add_driver(&adp5588_driver);
+}
+module_init(adp5588_init);
+
+static void __exit adp5588_exit(void)
+{
+        i2c_del_driver(&adp5588_driver);
+}
+module_exit(adp5588_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
+MODULE_DESCRIPTION("ADP5588 Keypad driver");
+MODULE_ALIAS("platform:adp5588-keys");