[PATCH] input: misc: Add TI drv2665 haptics driver

* [PATCH] input: misc: Add TI drv2665 haptics driver
@ 2015-04-24 18:16 Dan Murphy
  2015-05-05 12:05 ` Dan Murphy
  0 siblings, 1 reply; 4+ messages in thread
From: Dan Murphy @ 2015-04-24 18:16 UTC (permalink / raw)
  To: linux-input; +Cc: dmitry.torokhov, Dan Murphy

Add the TI drv2665 piezo haptic driver.
This haptics IC requires the data to be
streamed to the FIFO for continuous output.

Datasheet can be found at:
http://www.ti.com/product/drv2665

Signed-off-by: Dan Murphy <dmurphy@ti.com>
---
 .../devicetree/bindings/input/ti,drv2665.txt       |  17 +
 drivers/input/misc/Kconfig                         |  11 +
 drivers/input/misc/Makefile                        |   1 +
 drivers/input/misc/drv2665.c                       | 357 +++++++++++++++++++++
 4 files changed, 386 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/input/ti,drv2665.txt
 create mode 100644 drivers/input/misc/drv2665.c

diff --git a/Documentation/devicetree/bindings/input/ti,drv2665.txt b/Documentation/devicetree/bindings/input/ti,drv2665.txt
new file mode 100644
index 0000000..1ba97ac
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/ti,drv2665.txt
@@ -0,0 +1,17 @@
+* Texas Instruments - drv2665 Haptics driver
+
+Required properties:
+	- compatible - "ti,drv2665" - DRV2665
+	- reg -  I2C slave address
+	- vbat-supply - Required supply regulator
+
+Example:
+
+haptics: haptics@59 {
+	compatible = "ti,drv2665";
+	reg = <0x59>;
+	vbat-supply = <&vbat>;
+};
+
+For more product information please see the link below:
+http://www.ti.com/product/drv2665
diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index 7838f1a..e5c4de2 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -775,6 +775,17 @@ config INPUT_DRV260X_HAPTICS
 	  To compile this driver as a module, choose M here: the
 	  module will be called drv260x-haptics.
 
+config INPUT_DRV2665_HAPTICS
+	tristate "TI DRV2665 haptics support"
+	depends on INPUT && I2C
+	select INPUT_FF_MEMLESS
+	select REGMAP_I2C
+	help
+	  Say Y to enable support for the TI DRV2665 haptics driver.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called drv2665-haptics.
+
 config INPUT_DRV2667_HAPTICS
 	tristate "TI DRV2667 haptics support"
 	depends on INPUT && I2C
diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index 78ba4c1..d317947 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -28,6 +28,7 @@ obj-$(CONFIG_INPUT_DA9055_ONKEY)	+= da9055_onkey.o
 obj-$(CONFIG_INPUT_DM355EVM)		+= dm355evm_keys.o
 obj-$(CONFIG_INPUT_E3X0_BUTTON)		+= e3x0-button.o
 obj-$(CONFIG_INPUT_DRV260X_HAPTICS)	+= drv260x.o
+obj-$(CONFIG_INPUT_DRV2665_HAPTICS)	+= drv2665.o
 obj-$(CONFIG_INPUT_DRV2667_HAPTICS)	+= drv2667.o
 obj-$(CONFIG_INPUT_GP2A)		+= gp2ap002a00f.o
 obj-$(CONFIG_INPUT_GPIO_BEEPER)		+= gpio-beeper.o
diff --git a/drivers/input/misc/drv2665.c b/drivers/input/misc/drv2665.c
new file mode 100644
index 0000000..be570f7
--- /dev/null
+++ b/drivers/input/misc/drv2665.c
@@ -0,0 +1,357 @@
+/*
+ * DRV2665 haptics driver family
+ *
+ * Author: Dan Murphy <dmurphy@ti.com>
+ *
+ * Copyright: (C) 2015 Texas Instruments, Inc.
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ */
+
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/regulator/consumer.h>
+
+/* Contol registers */
+#define DRV2665_STATUS	0x00
+#define DRV2665_CTRL_1	0x01
+#define DRV2665_CTRL_2	0x02
+#define DRV2665_FIFO	0x0b
+
+/* Status Register */
+#define DRV2665_FIFO_FULL		BIT(0)
+#define DRV2665_FIFO_EMPTY		BIT(1)
+
+/* Control 1 Register */
+#define DRV2665_25_VPP_GAIN		0x00
+#define DRV2665_50_VPP_GAIN		0x01
+#define DRV2665_75_VPP_GAIN		0x02
+#define DRV2665_100_VPP_GAIN		0x03
+#define DRV2665_DIGITAL_IN		0xfc
+#define DRV2665_ANALOG_IN		BIT(2)
+
+/* Control 2 Register */
+#define DRV2665_BOOST_EN		BIT(1)
+#define DRV2665_STANDBY			BIT(6)
+#define DRV2665_DEV_RST			BIT(7)
+#define DRV2665_5_MS_IDLE_TOUT		0x00
+#define DRV2665_10_MS_IDLE_TOUT		0x04
+#define DRV2665_15_MS_IDLE_TOUT		0x08
+#define DRV2665_20_MS_IDLE_TOUT		0x0c
+
+/**
+ * struct drv2665_data -
+ * @input_dev - Pointer to the input device
+ * @client - Pointer to the I2C client
+ * @regmap - Register map of the device
+ * @work - Work item used to off load the enable/disable of the vibration
+ * @regulator - Pointer to the regulator for the IC
+**/
+struct drv2665_data {
+	struct input_dev *input_dev;
+	struct i2c_client *client;
+	struct regmap *regmap;
+	struct work_struct work;
+	struct regulator *regulator;
+};
+
+/* 8kHz Sine wave to stream to the FIFO */
+struct drv2665_waveform {
+	u8 data;
+} sine_wave_form[] = {
+	{ 0x0 },
+	{ 0x10 },
+	{ 0x20 },
+	{ 0x2e },
+	{ 0x3c },
+	{ 0x48 },
+	{ 0x53 },
+	{ 0x5b },
+	{ 0x61 },
+	{ 0x65 },
+	{ 0x66 },
+	{ 0x65 },
+	{ 0x61 },
+	{ 0x5b },
+	{ 0x53 },
+	{ 0x48 },
+	{ 0x3c },
+	{ 0x2e },
+	{ 0x20 },
+	{ 0x10 },
+	{ 0x0 },
+	{ 0xf0 },
+	{ 0xe0 },
+	{ 0xd2 },
+	{ 0xc4 },
+	{ 0xb8 },
+	{ 0xaD },
+	{ 0xa5 },
+	{ 0x9f },
+	{ 0x9b },
+	{ 0x9a },
+	{ 0x9b },
+	{ 0x9f },
+	{ 0xa5 },
+	{ 0xad },
+	{ 0xb8 },
+	{ 0xc4 },
+	{ 0xd2 },
+	{ 0xe0 },
+	{ 0xf0 },
+	{ 0x0 },
+};
+
+static struct reg_default drv2665_reg_defs[] = {
+	{ DRV2665_STATUS, 0x02 },
+	{ DRV2665_CTRL_1, 0x28 },
+	{ DRV2665_CTRL_2, 0x40 },
+	{ DRV2665_FIFO, 0x00 },
+};
+
+static void drv2665_worker(struct work_struct *work)
+{
+	struct drv2665_data *haptics = container_of(work, struct drv2665_data, work);
+	int error;
+	unsigned int read_buf;
+
+	error = regmap_read(haptics->regmap, DRV2665_STATUS,
+				&read_buf);
+	if (error) {
+		dev_err(&haptics->client->dev,
+			"Failed to read status: %d\n", error);
+		return;
+	}
+
+	if (read_buf & DRV2665_FIFO_EMPTY) {
+		error = regmap_bulk_write(haptics->regmap,
+				DRV2665_FIFO, sine_wave_form,
+				ARRAY_SIZE(sine_wave_form));
+		if (error) {
+			dev_err(&haptics->client->dev,
+				"Failed to write FIFO: %d\n", error);
+			return;
+		}
+	}
+}
+
+static int drv2665_haptics_play(struct input_dev *input, void *data,
+				struct ff_effect *effect)
+{
+	struct drv2665_data *haptics = input_get_drvdata(input);
+
+	schedule_work(&haptics->work);
+
+	return 0;
+}
+
+static void drv2665_close(struct input_dev *input)
+{
+	struct drv2665_data *haptics = input_get_drvdata(input);
+	int error;
+
+	cancel_work_sync(&haptics->work);
+
+	error = regmap_update_bits(haptics->regmap, DRV2665_CTRL_2,
+				DRV2665_STANDBY, 1);
+	if (error)
+		dev_err(&haptics->client->dev,
+			"Failed to enter standby mode: %d\n", error);
+}
+
+static const struct reg_default drv2665_init_regs[] = {
+	{ DRV2665_CTRL_2, 0 | DRV2665_10_MS_IDLE_TOUT },
+	{ DRV2665_CTRL_1, DRV2665_25_VPP_GAIN },
+};
+
+static int drv2665_init(struct drv2665_data *haptics)
+{
+	int error;
+
+	error = regmap_register_patch(haptics->regmap,
+				      drv2665_init_regs,
+				      ARRAY_SIZE(drv2665_init_regs));
+	if (error)
+		dev_err(&haptics->client->dev,
+			"Failed to write init registers: %d\n",
+			error);
+	return error;
+}
+
+static const struct regmap_config drv2665_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+
+	.max_register = DRV2665_FIFO,
+	.reg_defaults = drv2665_reg_defs,
+	.num_reg_defaults = ARRAY_SIZE(drv2665_reg_defs),
+	.cache_type = REGCACHE_NONE,
+};
+
+static int drv2665_probe(struct i2c_client *client,
+			 const struct i2c_device_id *id)
+{
+	struct drv2665_data *haptics;
+	int error;
+
+	haptics = devm_kzalloc(&client->dev, sizeof(*haptics), GFP_KERNEL);
+	if (!haptics)
+		return -ENOMEM;
+
+	haptics->regulator = devm_regulator_get(&client->dev, "vbat");
+	if (IS_ERR(haptics->regulator)) {
+		error = PTR_ERR(haptics->regulator);
+		dev_err(&client->dev,
+			"unable to get regulator, error: %d\n", error);
+		return error;
+	}
+
+	haptics->input_dev = devm_input_allocate_device(&client->dev);
+	if (!haptics->input_dev) {
+		dev_err(&client->dev, "Failed to allocate input device\n");
+		return -ENOMEM;
+	}
+
+	haptics->input_dev->name = "drv2665:haptics";
+	haptics->input_dev->dev.parent = client->dev.parent;
+	haptics->input_dev->close = drv2665_close;
+	input_set_drvdata(haptics->input_dev, haptics);
+	input_set_capability(haptics->input_dev, EV_FF, FF_RUMBLE);
+
+	error = input_ff_create_memless(haptics->input_dev, NULL,
+					drv2665_haptics_play);
+	if (error) {
+		dev_err(&client->dev, "input_ff_create() failed: %d\n",
+			error);
+		return error;
+	}
+
+	INIT_WORK(&haptics->work, drv2665_worker);
+
+	haptics->client = client;
+	i2c_set_clientdata(client, haptics);
+
+	haptics->regmap = devm_regmap_init_i2c(client, &drv2665_regmap_config);
+	if (IS_ERR(haptics->regmap)) {
+		error = PTR_ERR(haptics->regmap);
+		dev_err(&client->dev, "Failed to allocate register map: %d\n",
+			error);
+		return error;
+	}
+
+	error = drv2665_init(haptics);
+	if (error) {
+		dev_err(&client->dev, "Device init failed: %d\n", error);
+		return error;
+	}
+
+	error = input_register_device(haptics->input_dev);
+	if (error) {
+		dev_err(&client->dev, "couldn't register input device: %d\n",
+			error);
+		return error;
+	}
+
+	return 0;
+}
+
+static int __maybe_unused drv2665_suspend(struct device *dev)
+{
+	struct drv2665_data *haptics = dev_get_drvdata(dev);
+	int ret = 0;
+
+	mutex_lock(&haptics->input_dev->mutex);
+
+	if (haptics->input_dev->users) {
+		ret = regmap_update_bits(haptics->regmap, DRV2665_CTRL_2,
+				DRV2665_STANDBY, 1);
+		if (ret) {
+			dev_err(dev, "Failed to set standby mode\n");
+			regulator_disable(haptics->regulator);
+			goto out;
+		}
+
+		ret = regulator_disable(haptics->regulator);
+		if (ret) {
+			dev_err(dev, "Failed to disable regulator\n");
+			regmap_update_bits(haptics->regmap,
+					   DRV2665_CTRL_2,
+					   DRV2665_STANDBY, 0);
+		}
+	}
+out:
+	mutex_unlock(&haptics->input_dev->mutex);
+	return ret;
+}
+
+static int __maybe_unused drv2665_resume(struct device *dev)
+{
+	struct drv2665_data *haptics = dev_get_drvdata(dev);
+	int ret = 0;
+
+	mutex_lock(&haptics->input_dev->mutex);
+
+	if (haptics->input_dev->users) {
+		ret = regulator_enable(haptics->regulator);
+		if (ret) {
+			dev_err(dev, "Failed to enable regulator\n");
+			goto out;
+		}
+
+		ret = regmap_update_bits(haptics->regmap, DRV2665_CTRL_2,
+					 DRV2665_STANDBY, 0);
+		if (ret) {
+			dev_err(dev, "Failed to unset standby mode\n");
+			regulator_disable(haptics->regulator);
+			goto out;
+		}
+
+	}
+
+out:
+	mutex_unlock(&haptics->input_dev->mutex);
+	return ret;
+}
+
+static SIMPLE_DEV_PM_OPS(drv2665_pm_ops, drv2665_suspend, drv2665_resume);
+
+static const struct i2c_device_id drv2665_id[] = {
+	{ "drv2665", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, drv2665_id);
+
+#ifdef CONFIG_OF
+static const struct of_device_id drv2665_of_match[] = {
+	{ .compatible = "ti,drv2665", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, drv2665_of_match);
+#endif
+
+static struct i2c_driver drv2665_driver = {
+	.probe		= drv2665_probe,
+	.driver		= {
+		.name	= "drv2665-haptics",
+		.owner	= THIS_MODULE,
+		.of_match_table = of_match_ptr(drv2665_of_match),
+		.pm	= &drv2665_pm_ops,
+	},
+	.id_table = drv2665_id,
+};
+module_i2c_driver(drv2665_driver);
+
+MODULE_DESCRIPTION("TI DRV2665 haptics driver");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>");
-- 
1.9.1


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