[v2] Input: Add driver for Microchip's CAP1106

Message ID	1405073193-21448-1-git-send-email-zonque@gmail.com (mailing list archive)
State	New, archived
Headers	show Return-Path: <linux-input-owner@kernel.org> From: Daniel Mack <zonque@gmail.com> To: dtor@mail.ru Cc: linux-input@vger.kernel.org, broonie@kernel.org, dh.herrmann@gmail.com, devicetree@vger.kernel.org, Daniel Mack <zonque@gmail.com> Subject: [PATCH v2] Input: Add driver for Microchip's CAP1106 Date: Fri, 11 Jul 2014 12:06:33 +0200 Message-Id: <1405073193-21448-1-git-send-email-zonque@gmail.com> Sender: linux-input-owner@vger.kernel.org Precedence: bulk

diff --git a/Documentation/devicetree/bindings/input/cap1106.txt b/Documentation/devicetree/bindings/input/cap1106.txt new file mode 100644 index 0000000..57f5af3 --- /dev/null +++ b/Documentation/devicetree/bindings/input/cap1106.txt @@ -0,0 +1,63 @@ +Device tree bindings for Microchip CAP1106, 6 channel capacitive touch sensor + +The node for this driver must be a child of a I2C controller node, as the +device communication via I2C only. + +Required properties: + + compatible: Must be "microchip,cap1106" + reg: The I2C slave address of the device. + Only 0x28 is valid. + interrupt: Node describing the interrupt line the device's + ALERT#/CM_IRQ# pin is connected to. + +Optional properties: + + autorepeat: Enables the Linux input system's autorepeat + feature on the input device. + microchip,sensor-gain: Defines the gain of the sensor circuitry. This + effectively controls the sensitivity, as a + smaller delta capacitance is required to + generate the same delta count values. + Valid values are 1, 2, 4, and 8. + By default, a gain of 1 is set. + +To define details of each individual button channel, six subnodes can be +specified. Inside each of those, the following property is valid: + + linux,keycode: Specify the numeric identifier of the keycode to be + generated when this channel is activated. If this + property is omitted, KEY_A, KEY_B, etc are used as + defaults. + +Example: + +i2c_controller { + cap1106@28 { + compatible = "microchip,cap1106"; + interrupt-parent = <&gpio1>; + interrupts = <0 0>; + reg = <0x28>; + autorepeat; + microchip,sensor-gain = <2>; + + up { + linux,keycode = <103>; /* KEY_UP */ + }; + right { + linux,keycode = <106>; /* KEY_RIGHT */ + }; + down { + linux,keycode = <108>; /* KEY_DOWN */ + }; + left { + linux,keycode = <105>; /* KEY_LEFT */ + }; + pagedown { + linux,keycode = <109>; /* KEY_PAGEDOWN */ + }; + pageup { + linux,keycode = <104>; /* KEY_PAGEUP */ + }; + }; +} diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig index f7e79b4..a3958c6 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 7504ae1..0a33456 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 0000000..b4741c5 --- /dev/null +++ b/drivers/input/keyboard/cap1106.c @@ -0,0 +1,378 @@ +/* + * 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; + struct work_struct work; + spinlock_t lock; + bool closed:1; + int irq; + + /* 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 void cap1106_work(struct work_struct *w) +{ + struct cap1106_priv *priv = container_of(w, struct cap1106_priv, work); + 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: + spin_lock(&priv->lock); + if (!priv->closed) + enable_irq(priv->irq); + spin_unlock(&priv->lock); +} + +static irqreturn_t cap1106_isr(int irq_num, void *data) +{ + struct cap1106_priv *priv = data; + + disable_irq_nosync(priv->irq); + schedule_work(&priv->work); + + return IRQ_HANDLED; +} + +static int cap1106_open(struct input_dev *input_dev) +{ + struct cap1106_priv *priv = input_get_drvdata(input_dev); + int ret; + + /* disable deep sleep */ + ret = regmap_update_bits(priv->regmap, CAP1106_REG_MAIN_CONTROL, + CAP1106_REG_MAIN_CONTROL_DLSEEP, 0); + + priv->closed = false; + enable_irq(priv->irq); + + return ret; +} + +static void cap1106_close(struct input_dev *input_dev) +{ + struct cap1106_priv *priv = input_get_drvdata(input_dev); + + spin_lock(&priv->lock); + priv->closed = true; + disable_irq(priv->irq); + spin_unlock(&priv->lock); + + cancel_work_sync(&priv->work); + + /* enable deep sleep */ + regmap_update_bits(priv->regmap, CAP1106_REG_MAIN_CONTROL, + CAP1106_REG_MAIN_CONTROL_DLSEEP, + CAP1106_REG_MAIN_CONTROL_DLSEEP); +} + +static int cap1106_i2c_probe(struct i2c_client *i2c_client, + const struct i2c_device_id *id) +{ + struct device *dev = &i2c_client->dev; + struct device_node *child, *node; + struct cap1106_priv *priv; + unsigned int val, rev; + u8 gain = 0; + int i, ret; + u32 tmp32; + + 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); + + ret = regmap_read(priv->regmap, CAP1106_REG_PRODUCT_ID, &val); + if (ret < 0) + return ret; + + if (val != CAP1106_PRODUCT_ID) { + dev_err(dev, "Product ID: Got 0x%02x, expected 0x%02x\n", + val, CAP1106_PRODUCT_ID); + return -ENODEV; + } + + ret = regmap_read(priv->regmap, CAP1106_REG_MANUFACTURER_ID, &val); + if (ret < 0) + return ret; + + if (val != CAP1106_MANUFACTURER_ID) { + dev_err(dev, "Manufacturer ID: Got 0x%02x, expected 0x%02x\n", + val, CAP1106_MANUFACTURER_ID); + return -ENODEV; + } + + ret = regmap_read(priv->regmap, CAP1106_REG_REVISION, &rev); + if (ret < 0) + return ret; + + dev_info(dev, "CAP1106 detected, revision 0x%02x\n", rev); + i2c_set_clientdata(i2c_client, priv); + INIT_WORK(&priv->work, cap1106_work); + spin_lock_init(&priv->lock); + node = dev->of_node; + + if (!of_property_read_u32(node, "microchip,sensor-gain", &tmp32)) { + if (is_power_of_2(tmp32) && tmp32 <= 8) + gain = ilog2(tmp32); + else + dev_err(dev, "Invalid sensor-gain value %d\n", tmp32); + } + + ret = regmap_update_bits(priv->regmap, CAP1106_REG_MAIN_CONTROL, + CAP1106_REG_MAIN_CONTROL_GAIN_MASK, + gain << CAP1106_REG_MAIN_CONTROL_GAIN_SHIFT); + if (ret < 0) + return ret; + + /* disable autorepeat. The Linux input system has its own handling. */ + ret = regmap_write(priv->regmap, CAP1106_REG_REPEAT_RATE, 0); + if (ret < 0) + return ret; + + /* set the defaults */ + for (i = 0; i < CAP1106_NUM_CHN; i++) + priv->keycodes[i] = KEY_A + i; + + i = 0; + for_each_child_of_node(node, child) { + if (i == CAP1106_NUM_CHN) { + dev_err(dev, "Too many button nodes.\n"); + return -EINVAL; + } + + if (!of_property_read_u32(child, "linux,keycode", &tmp32)) + priv->keycodes[i] = tmp32; + + i++; + } + + 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_get_property(node, "autorepeat", NULL)) + __set_bit(EV_REP, priv->idev->evbit); + + for (i = 0; i < CAP1106_NUM_CHN; i++) { + unsigned int code = priv->keycodes[i]; + priv->idev->keybit[BIT_WORD(code)] |= BIT_MASK(code); + } + + priv->idev->id.vendor = CAP1106_MANUFACTURER_ID; + priv->idev->id.product = CAP1106_PRODUCT_ID; + priv->idev->id.version = rev; + + priv->idev->open = cap1106_open; + priv->idev->close = cap1106_close; + + input_set_drvdata(priv->idev, priv); + priv->closed = true; + + ret = input_register_device(priv->idev); + if (ret < 0) + return ret; + + priv->irq = irq_of_parse_and_map(node, 0); + if (!priv->irq) { + dev_err(dev, "Unable to parse or map IRQ\n"); + return -ENXIO; + } + + ret = devm_request_irq(dev, priv->irq, cap1106_isr, IRQF_DISABLED, + dev_name(dev), priv); + if (ret < 0) + return ret; + + return 0; +} + +static int cap1106_i2c_remove(struct i2c_client *i2c_client) +{ + struct cap1106_priv *priv = i2c_get_clientdata(i2c_client); + + input_unregister_device(priv->idev); + + 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, + .remove = cap1106_i2c_remove, +}; + +module_i2c_driver(cap1106_i2c_driver); + +MODULE_ALIAS("platform:" DRV_NAME); +MODULE_DESCRIPTION("Microchip CAP1106 driver"); +MODULE_AUTHOR("Daniel Mack <linux@zonque.org>"); +MODULE_LICENSE("GPL v2");

[v2] Input: Add driver for Microchip's CAP1106

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