Input: add driver for Microchip's CAP1106

This patch adds a driver for Microchips CAP1106, an I2C driven, 6-channel
capacitive touch sensor.

For now, only the capacitive buttons are supported, and no specific
settings that can be tweaked for individual channels, except for the
device-wide sensitivity gain. The defaults seem to work just fine out of
the box, so I'll leave configurable parameters for someone who's in need
of them and who can actually measure the impact. All registers are
prepared, however. Many of them are just not used for now.

The implementation does not make any attempt to be compatible to platform
data driven boards, but fully depends on CONFIG_OF.

Power management functions are also left for volounteers with the ability
to actually test them.

Signed-off-by: Daniel Mack <zonque@gmail.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

3 files changed, 346 insertions, 0 deletions

diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
index 0f84f2346fe4..942338b4109f 100644
--- a/drivers/input/keyboard/Kconfig
+++ b/drivers/input/keyboard/Kconfig
@@ -665,4 +665,14 @@ config KEYBOARD_CROS_EC
           To compile this driver as a module, choose M here: the
           module will be called cros_ec_keyb.
 
+config KEYBOARD_CAP1106
+        tristate "Microchip CAP1106 touch sensor"
+        depends on OF && I2C
+        select REGMAP_I2C
+        help
+          Say Y here to enable the CAP1106 touch sensor driver.
+
+          To compile this driver as a module, choose M here: the
+          module will be called cap1106.
+
 endif
diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile
index 7504ae19049d..0a3345634d79 100644
--- a/drivers/input/keyboard/Makefile
+++ b/drivers/input/keyboard/Makefile
@@ -11,6 +11,7 @@ obj-$(CONFIG_KEYBOARD_AMIGA)		+= amikbd.o
 obj-$(CONFIG_KEYBOARD_ATARI)            += atakbd.o
 obj-$(CONFIG_KEYBOARD_ATKBD)            += atkbd.o
 obj-$(CONFIG_KEYBOARD_BFIN)             += bf54x-keys.o
+obj-$(CONFIG_KEYBOARD_CAP1106)          += cap1106.o
 obj-$(CONFIG_KEYBOARD_CLPS711X)         += clps711x-keypad.o
 obj-$(CONFIG_KEYBOARD_CROS_EC)          += cros_ec_keyb.o
 obj-$(CONFIG_KEYBOARD_DAVINCI)          += davinci_keyscan.o
diff --git a/drivers/input/keyboard/cap1106.c b/drivers/input/keyboard/cap1106.c
new file mode 100644
index 000000000000..f7d7a0d4ab4e
--- /dev/null
+++ b/drivers/input/keyboard/cap1106.c
@@ -0,0 +1,335 @@
+/*
+ * Input driver for Microchip CAP1106, 6 channel capacitive touch sensor
+ *
+ * http://www.microchip.com/wwwproducts/Devices.aspx?product=CAP1106
+ *
+ * (c) 2014 Daniel Mack <linux@zonque.org>
+ *
+ * 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.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/input.h>
+#include <linux/of_irq.h>
+#include <linux/regmap.h>
+#include <linux/i2c.h>
+#include <linux/gpio/consumer.h>
+
+#define CAP1106_REG_MAIN_CONTROL        0x00
+#define CAP1106_REG_MAIN_CONTROL_GAIN_SHIFT     (6)
+#define CAP1106_REG_MAIN_CONTROL_GAIN_MASK      (0xc0)
+#define CAP1106_REG_MAIN_CONTROL_DLSEEP         BIT(4)
+#define CAP1106_REG_GENERAL_STATUS      0x02
+#define CAP1106_REG_SENSOR_INPUT        0x03
+#define CAP1106_REG_NOISE_FLAG_STATUS   0x0a
+#define CAP1106_REG_SENOR_DELTA(X)      (0x10 + (X))
+#define CAP1106_REG_SENSITIVITY_CONTROL 0x1f
+#define CAP1106_REG_CONFIG              0x20
+#define CAP1106_REG_SENSOR_ENABLE       0x21
+#define CAP1106_REG_SENSOR_CONFIG       0x22
+#define CAP1106_REG_SENSOR_CONFIG2      0x23
+#define CAP1106_REG_SAMPLING_CONFIG     0x24
+#define CAP1106_REG_CALIBRATION         0x25
+#define CAP1106_REG_INT_ENABLE          0x26
+#define CAP1106_REG_REPEAT_RATE         0x28
+#define CAP1106_REG_MT_CONFIG           0x2a
+#define CAP1106_REG_MT_PATTERN_CONFIG   0x2b
+#define CAP1106_REG_MT_PATTERN          0x2d
+#define CAP1106_REG_RECALIB_CONFIG      0x2f
+#define CAP1106_REG_SENSOR_THRESH(X)    (0x30 + (X))
+#define CAP1106_REG_SENSOR_NOISE_THRESH 0x38
+#define CAP1106_REG_STANDBY_CHANNEL     0x40
+#define CAP1106_REG_STANDBY_CONFIG      0x41
+#define CAP1106_REG_STANDBY_SENSITIVITY 0x42
+#define CAP1106_REG_STANDBY_THRESH      0x43
+#define CAP1106_REG_CONFIG2             0x44
+#define CAP1106_REG_SENSOR_BASE_CNT(X)  (0x50 + (X))
+#define CAP1106_REG_SENSOR_CALIB        (0xb1 + (X))
+#define CAP1106_REG_SENSOR_CALIB_LSB1   0xb9
+#define CAP1106_REG_SENSOR_CALIB_LSB2   0xba
+#define CAP1106_REG_PRODUCT_ID          0xfd
+#define CAP1106_REG_MANUFACTURER_ID     0xfe
+#define CAP1106_REG_REVISION            0xff
+
+#define CAP1106_NUM_CHN 6
+#define CAP1106_PRODUCT_ID      0x55
+#define CAP1106_MANUFACTURER_ID 0x5d
+
+struct cap1106_priv {
+        struct regmap *regmap;
+        struct input_dev *idev;
+
+        /* config */
+        unsigned int keycodes[CAP1106_NUM_CHN];
+};
+
+static const struct reg_default cap1106_reg_defaults[] = {
+        { CAP1106_REG_MAIN_CONTROL,             0x00 },
+        { CAP1106_REG_GENERAL_STATUS,           0x00 },
+        { CAP1106_REG_SENSOR_INPUT,             0x00 },
+        { CAP1106_REG_NOISE_FLAG_STATUS,        0x00 },
+        { CAP1106_REG_SENSITIVITY_CONTROL,      0x2f },
+        { CAP1106_REG_CONFIG,                   0x20 },
+        { CAP1106_REG_SENSOR_ENABLE,            0x3f },
+        { CAP1106_REG_SENSOR_CONFIG,            0xa4 },
+        { CAP1106_REG_SENSOR_CONFIG2,           0x07 },
+        { CAP1106_REG_SAMPLING_CONFIG,          0x39 },
+        { CAP1106_REG_CALIBRATION,              0x00 },
+        { CAP1106_REG_INT_ENABLE,               0x3f },
+        { CAP1106_REG_REPEAT_RATE,              0x3f },
+        { CAP1106_REG_MT_CONFIG,                0x80 },
+        { CAP1106_REG_MT_PATTERN_CONFIG,        0x00 },
+        { CAP1106_REG_MT_PATTERN,               0x3f },
+        { CAP1106_REG_RECALIB_CONFIG,           0x8a },
+        { CAP1106_REG_SENSOR_THRESH(0),         0x40 },
+        { CAP1106_REG_SENSOR_THRESH(1),         0x40 },
+        { CAP1106_REG_SENSOR_THRESH(2),         0x40 },
+        { CAP1106_REG_SENSOR_THRESH(3),         0x40 },
+        { CAP1106_REG_SENSOR_THRESH(4),         0x40 },
+        { CAP1106_REG_SENSOR_THRESH(5),         0x40 },
+        { CAP1106_REG_SENSOR_NOISE_THRESH,      0x01 },
+        { CAP1106_REG_STANDBY_CHANNEL,          0x00 },
+        { CAP1106_REG_STANDBY_CONFIG,           0x39 },
+        { CAP1106_REG_STANDBY_SENSITIVITY,      0x02 },
+        { CAP1106_REG_STANDBY_THRESH,           0x40 },
+        { CAP1106_REG_CONFIG2,                  0x40 },
+        { CAP1106_REG_SENSOR_CALIB_LSB1,        0x00 },
+        { CAP1106_REG_SENSOR_CALIB_LSB2,        0x00 },
+};
+
+static bool cap1106_volatile_reg(struct device *dev, unsigned int reg)
+{
+        switch (reg) {
+        case CAP1106_REG_MAIN_CONTROL:
+        case CAP1106_REG_SENSOR_INPUT:
+        case CAP1106_REG_SENOR_DELTA(0):
+        case CAP1106_REG_SENOR_DELTA(1):
+        case CAP1106_REG_SENOR_DELTA(2):
+        case CAP1106_REG_SENOR_DELTA(3):
+        case CAP1106_REG_SENOR_DELTA(4):
+        case CAP1106_REG_SENOR_DELTA(5):
+        case CAP1106_REG_PRODUCT_ID:
+        case CAP1106_REG_MANUFACTURER_ID:
+        case CAP1106_REG_REVISION:
+                return true;
+        }
+
+        return false;
+}
+
+static const struct regmap_config cap1106_regmap_config = {
+        .reg_bits = 8,
+        .val_bits = 8,
+
+        .max_register = CAP1106_REG_REVISION,
+        .reg_defaults = cap1106_reg_defaults,
+
+        .num_reg_defaults = ARRAY_SIZE(cap1106_reg_defaults),
+        .cache_type = REGCACHE_RBTREE,
+        .volatile_reg = cap1106_volatile_reg,
+};
+
+static irqreturn_t cap1106_thread_func(int irq_num, void *data)
+{
+        struct cap1106_priv *priv = data;
+        unsigned int status;
+        int ret, i;
+
+        /*
+         * Deassert interrupt. This needs to be done before reading the status
+         * registers, which will not carry valid values otherwise.
+         */
+        ret = regmap_update_bits(priv->regmap, CAP1106_REG_MAIN_CONTROL, 1, 0);
+        if (ret < 0)
+                goto out;
+
+        ret = regmap_read(priv->regmap, CAP1106_REG_SENSOR_INPUT, &status);
+        if (ret < 0)
+                goto out;
+
+        for (i = 0; i < CAP1106_NUM_CHN; i++)
+                input_report_key(priv->idev, priv->keycodes[i],
+                                 status & (1 << i));
+
+        input_sync(priv->idev);
+
+out:
+        return IRQ_HANDLED;
+}
+
+static int cap1106_set_sleep(struct cap1106_priv *priv, bool sleep)
+{
+        return regmap_update_bits(priv->regmap, CAP1106_REG_MAIN_CONTROL,
+                                  CAP1106_REG_MAIN_CONTROL_DLSEEP,
+                                  sleep ? CAP1106_REG_MAIN_CONTROL_DLSEEP : 0);
+}
+
+static int cap1106_input_open(struct input_dev *idev)
+{
+        struct cap1106_priv *priv = input_get_drvdata(idev);
+
+        return cap1106_set_sleep(priv, false);
+}
+
+static void cap1106_input_close(struct input_dev *idev)
+{
+        struct cap1106_priv *priv = input_get_drvdata(idev);
+
+        cap1106_set_sleep(priv, true);
+}
+
+static int cap1106_i2c_probe(struct i2c_client *i2c_client,
+                             const struct i2c_device_id *id)
+{
+        struct device *dev = &i2c_client->dev;
+        struct cap1106_priv *priv;
+        struct device_node *node;
+        int i, error, irq, gain = 0;
+        unsigned int val, rev;
+        u32 gain32, keycodes[CAP1106_NUM_CHN];
+
+        priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+        if (!priv)
+                return -ENOMEM;
+
+        priv->regmap = devm_regmap_init_i2c(i2c_client, &cap1106_regmap_config);
+        if (IS_ERR(priv->regmap))
+                return PTR_ERR(priv->regmap);
+
+        error = regmap_read(priv->regmap, CAP1106_REG_PRODUCT_ID, &val);
+        if (error)
+                return error;
+
+        if (val != CAP1106_PRODUCT_ID) {
+                dev_err(dev, "Product ID: Got 0x%02x, expected 0x%02x\n",
+                        val, CAP1106_PRODUCT_ID);
+                return -ENODEV;
+        }
+
+        error = regmap_read(priv->regmap, CAP1106_REG_MANUFACTURER_ID, &val);
+        if (error)
+                return error;
+
+        if (val != CAP1106_MANUFACTURER_ID) {
+                dev_err(dev, "Manufacturer ID: Got 0x%02x, expected 0x%02x\n",
+                        val, CAP1106_MANUFACTURER_ID);
+                return -ENODEV;
+        }
+
+        error = regmap_read(priv->regmap, CAP1106_REG_REVISION, &rev);
+        if (error < 0)
+                return error;
+
+        dev_info(dev, "CAP1106 detected, revision 0x%02x\n", rev);
+        i2c_set_clientdata(i2c_client, priv);
+        node = dev->of_node;
+
+        if (!of_property_read_u32(node, "microchip,sensor-gain", &gain32)) {
+                if (is_power_of_2(gain32) && gain32 <= 8)
+                        gain = ilog2(gain32);
+                else
+                        dev_err(dev, "Invalid sensor-gain value %d\n", gain32);
+        }
+
+        BUILD_BUG_ON(ARRAY_SIZE(keycodes) != ARRAY_SIZE(priv->keycodes));
+
+        /* Provide some useful defaults */
+        for (i = 0; i < ARRAY_SIZE(keycodes); i++)
+                keycodes[i] = KEY_A + i;
+
+        of_property_read_u32_array(node, "linux,keycodes",
+                                   keycodes, ARRAY_SIZE(keycodes));
+
+        for (i = 0; i < ARRAY_SIZE(keycodes); i++)
+                priv->keycodes[i] = keycodes[i];
+
+        error = regmap_update_bits(priv->regmap, CAP1106_REG_MAIN_CONTROL,
+                                   CAP1106_REG_MAIN_CONTROL_GAIN_MASK,
+                                   gain << CAP1106_REG_MAIN_CONTROL_GAIN_SHIFT);
+        if (error)
+                return error;
+
+        /* Disable autorepeat. The Linux input system has its own handling. */
+        error = regmap_write(priv->regmap, CAP1106_REG_REPEAT_RATE, 0);
+        if (error)
+                return error;
+
+        priv->idev = devm_input_allocate_device(dev);
+        if (!priv->idev)
+                return -ENOMEM;
+
+        priv->idev->name = "CAP1106 capacitive touch sensor";
+        priv->idev->id.bustype = BUS_I2C;
+        priv->idev->evbit[0] = BIT_MASK(EV_KEY);
+
+        if (of_property_read_bool(node, "autorepeat"))
+                __set_bit(EV_REP, priv->idev->evbit);
+
+        for (i = 0; i < CAP1106_NUM_CHN; i++)
+                __set_bit(priv->keycodes[i], priv->idev->keybit);
+
+        priv->idev->id.vendor = CAP1106_MANUFACTURER_ID;
+        priv->idev->id.product = CAP1106_PRODUCT_ID;
+        priv->idev->id.version = rev;
+
+        priv->idev->open = cap1106_input_open;
+        priv->idev->close = cap1106_input_close;
+
+        input_set_drvdata(priv->idev, priv);
+
+        /*
+         * Put the device in deep sleep mode for now.
+         * ->open() will bring it back once the it is actually needed.
+         */
+        cap1106_set_sleep(priv, true);
+
+        error = input_register_device(priv->idev);
+        if (error)
+                return error;
+
+        irq = irq_of_parse_and_map(node, 0);
+        if (!irq) {
+                dev_err(dev, "Unable to parse or map IRQ\n");
+                return -ENXIO;
+        }
+
+        error = devm_request_threaded_irq(dev, irq, NULL, cap1106_thread_func,
+                                          IRQF_ONESHOT, dev_name(dev), priv);
+        if (error)
+                return error;
+
+        return 0;
+}
+
+static const struct of_device_id cap1106_dt_ids[] = {
+        { .compatible = "microchip,cap1106", },
+        {}
+};
+MODULE_DEVICE_TABLE(of, cap1106_dt_ids);
+
+static const struct i2c_device_id cap1106_i2c_ids[] = {
+        { "cap1106", 0 },
+        {}
+};
+MODULE_DEVICE_TABLE(i2c, cap1106_i2c_ids);
+
+static struct i2c_driver cap1106_i2c_driver = {
+        .driver = {
+                .name   = "cap1106",
+                .owner  = THIS_MODULE,
+                .of_match_table = cap1106_dt_ids,
+        },
+        .id_table       = cap1106_i2c_ids,
+        .probe          = cap1106_i2c_probe,
+};
+
+module_i2c_driver(cap1106_i2c_driver);
+
+MODULE_ALIAS("platform:cap1106");
+MODULE_DESCRIPTION("Microchip CAP1106 driver");
+MODULE_AUTHOR("Daniel Mack <linux@zonque.org>");
+MODULE_LICENSE("GPL v2");