Input: add TI drv2665 haptics driver

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

4 files changed, 351 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/input/ti,drv2665.txt b/Documentation/devicetree/bindings/input/ti,drv2665.txt
new file mode 100644
index 000000000000..1ba97ac04305
--- /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 7838f1a06856..e5c4de279001 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 78ba4c1b8532..d3179472474d 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 000000000000..0afaa33de07d
--- /dev/null
+++ b/drivers/input/misc/drv2665.c
@@ -0,0 +1,322 @@
+/*
+ * 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 */
+static const u8 drv2665_sine_wave_form[] = {
+        0x00, 0x10, 0x20, 0x2e, 0x3c, 0x48, 0x53, 0x5b, 0x61, 0x65, 0x66,
+        0x65, 0x61, 0x5b, 0x53, 0x48, 0x3c, 0x2e, 0x20, 0x10,
+        0x00, 0xf0, 0xe0, 0xd2, 0xc4, 0xb8, 0xad, 0xa5, 0x9f, 0x9b, 0x9a,
+        0x9b, 0x9f, 0xa5, 0xad, 0xb8, 0xc4, 0xd2, 0xe0, 0xf0, 0x00,
+};
+
+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);
+        unsigned int read_buf;
+        int error;
+
+        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,
+                                          drv2665_sine_wave_form,
+                                          ARRAY_SIZE(drv2665_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;
+        }
+
+        return 0;
+}
+
+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>");