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    Subject[PATCH v6 11/18] input: Add initial support for TWL6040 vibrator
    Date
    From: Misael Lopez Cruz <misael.lopez@ti.com>

    Add twl6040_vibra as a child of MFD device twl6040_codec. This
    implementation covers the PCM-to-PWM mode of TWL6040 vibrator
    module.

    Signed-off-by: Misael Lopez Cruz <misael.lopez@ti.com>
    Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
    CC: Tejun Heo <tj@kernel.org>
    ---
    drivers/input/misc/Kconfig | 11 +
    drivers/input/misc/Makefile | 1 +
    drivers/input/misc/twl6040-vibra.c | 416 ++++++++++++++++++++++++++++++++++++
    include/linux/i2c/twl.h | 8 +
    4 files changed, 436 insertions(+), 0 deletions(-)
    create mode 100644 drivers/input/misc/twl6040-vibra.c

    diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
    index 077309a..d1bf872 100644
    --- a/drivers/input/misc/Kconfig
    +++ b/drivers/input/misc/Kconfig
    @@ -275,6 +275,17 @@ config INPUT_TWL4030_VIBRA
    To compile this driver as a module, choose M here. The module will
    be called twl4030_vibra.

    +config INPUT_TWL6040_VIBRA
    + tristate "Support for TWL6040 Vibrator"
    + depends on TWL4030_CORE
    + select TWL6040_CORE
    + select INPUT_FF_MEMLESS
    + help
    + This option enables support for TWL6040 Vibrator Driver.
    +
    + To compile this driver as a module, choose M here. The module will
    + be called twl6040_vibra.
    +
    config INPUT_UINPUT
    tristate "User level driver support"
    help
    diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
    index 38efb2c..4da7c3a 100644
    --- a/drivers/input/misc/Makefile
    +++ b/drivers/input/misc/Makefile
    @@ -40,6 +40,7 @@ obj-$(CONFIG_INPUT_SGI_BTNS) += sgi_btns.o
    obj-$(CONFIG_INPUT_SPARCSPKR) += sparcspkr.o
    obj-$(CONFIG_INPUT_TWL4030_PWRBUTTON) += twl4030-pwrbutton.o
    obj-$(CONFIG_INPUT_TWL4030_VIBRA) += twl4030-vibra.o
    +obj-$(CONFIG_INPUT_TWL6040_VIBRA) += twl6040-vibra.o
    obj-$(CONFIG_INPUT_UINPUT) += uinput.o
    obj-$(CONFIG_INPUT_WISTRON_BTNS) += wistron_btns.o
    obj-$(CONFIG_INPUT_WM831X_ON) += wm831x-on.o
    diff --git a/drivers/input/misc/twl6040-vibra.c b/drivers/input/misc/twl6040-vibra.c
    new file mode 100644
    index 0000000..9652ebf
    --- /dev/null
    +++ b/drivers/input/misc/twl6040-vibra.c
    @@ -0,0 +1,416 @@
    +/*
    + * twl6040-vibra.c - TWL6040 Vibrator driver
    + *
    + * Author: Jorge Eduardo Candelaria <jorge.candelaria@ti.com>
    + * Author: Misael Lopez Cruz <misael.lopez@ti.com>
    + *
    + * Copyright: (C) 2011 Texas Instruments, Inc.
    + *
    + * Based on twl4030-vibra.c by Henrik Saari <henrik.saari@nokia.com>
    + * Felipe Balbi <felipe.balbi@nokia.com>
    + * Jari Vanhala <ext-javi.vanhala@nokia.com>
    + *
    + * 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.
    + *
    + * You should have received a copy of the GNU General Public License
    + * along with this program; if not, write to the Free Software
    + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
    + * 02110-1301 USA
    + *
    + */
    +#include <linux/module.h>
    +#include <linux/platform_device.h>
    +#include <linux/workqueue.h>
    +#include <linux/i2c/twl.h>
    +#include <linux/mfd/twl6040.h>
    +#include <linux/slab.h>
    +#include <linux/delay.h>
    +#include <linux/regulator/consumer.h>
    +
    +#define EFFECT_DIR_180_DEG 0x8000
    +
    +/* Recommended modulation index 85% */
    +#define TWL6040_VIBRA_MOD 85
    +
    +#define TWL6040_NUM_SUPPLIES 2
    +
    +struct vibra_info {
    + struct device *dev;
    + struct input_dev *input_dev;
    + struct workqueue_struct *workqueue;
    + struct work_struct play_work;
    + struct mutex mutex;
    +
    + bool enabled;
    + int weak_speed;
    + int strong_speed;
    + int direction;
    +
    + unsigned int vibldrv_res;
    + unsigned int vibrdrv_res;
    + unsigned int viblmotor_res;
    + unsigned int vibrmotor_res;
    +
    + struct regulator_bulk_data supplies[TWL6040_NUM_SUPPLIES];
    +
    + struct twl6040 *twl6040;
    +};
    +
    +static irqreturn_t twl6040_vib_irq_handler(int irq, void *data)
    +{
    + struct vibra_info *info = data;
    + struct twl6040 *twl6040 = info->twl6040;
    + u8 status;
    +
    + status = twl6040_reg_read(twl6040, TWL6040_REG_STATUS);
    + if (status & TWL6040_VIBLOCDET) {
    + dev_warn(info->dev, "Left Vibrator overcurrent detected\n");
    + twl6040_clear_bits(twl6040, TWL6040_REG_VIBCTLL,
    + TWL6040_VIBENAL);
    + }
    + if (status & TWL6040_VIBROCDET) {
    + dev_warn(info->dev, "Right Vibrator overcurrent detected\n");
    + twl6040_clear_bits(twl6040, TWL6040_REG_VIBCTLR,
    + TWL6040_VIBENAR);
    + }
    +
    + return IRQ_HANDLED;
    +}
    +
    +static void twl6040_vibra_enable(struct vibra_info *info)
    +{
    + struct twl6040 *twl6040 = info->twl6040;
    + int ret;
    +
    + ret = regulator_bulk_enable(ARRAY_SIZE(info->supplies), info->supplies);
    + if (ret) {
    + dev_err(info->dev, "failed to enable regulators %d\n", ret);
    + return;
    + }
    +
    + twl6040_power(info->twl6040, 1);
    + if (twl6040_get_rev(twl6040) <= TWL6040_REV_ES1_1) {
    + /*
    + * ERRATA: Disable overcurrent protection for at least
    + * 3ms when enabling vibrator drivers to avoid false
    + * overcurrent detection
    + */
    + twl6040_reg_write(twl6040, TWL6040_REG_VIBCTLL,
    + TWL6040_VIBENAL | TWL6040_VIBCTRLL);
    + twl6040_reg_write(twl6040, TWL6040_REG_VIBCTLR,
    + TWL6040_VIBENAR | TWL6040_VIBCTRLR);
    + usleep_range(3000, 3500);
    + }
    +
    + twl6040_reg_write(twl6040, TWL6040_REG_VIBCTLL,
    + TWL6040_VIBENAL);
    + twl6040_reg_write(twl6040, TWL6040_REG_VIBCTLR,
    + TWL6040_VIBENAR);
    +
    + info->enabled = true;
    +}
    +
    +static void twl6040_vibra_disable(struct vibra_info *info)
    +{
    + struct twl6040 *twl6040 = info->twl6040;
    +
    + twl6040_reg_write(twl6040, TWL6040_REG_VIBCTLL, 0x00);
    + twl6040_reg_write(twl6040, TWL6040_REG_VIBCTLR, 0x00);
    + twl6040_power(info->twl6040, 0);
    +
    + regulator_bulk_disable(ARRAY_SIZE(info->supplies), info->supplies);
    +
    + info->enabled = false;
    +}
    +
    +static u8 twl6040_vibra_code(int vddvib, int vibdrv_res, int motor_res,
    + int speed, int direction)
    +{
    + int vpk, max_code;
    + u8 vibdat;
    +
    + /* output swing */
    + vpk = (vddvib * motor_res * TWL6040_VIBRA_MOD) /
    + (100 * (vibdrv_res + motor_res));
    +
    + /* 50mV per VIBDAT code step */
    + max_code = vpk / 50;
    + if (max_code > TWL6040_VIBDAT_MAX)
    + max_code = TWL6040_VIBDAT_MAX;
    +
    + /* scale speed to max allowed code */
    + vibdat = (u8)((speed * max_code) / USHRT_MAX);
    +
    + /* 2's complement for direction > 180 degrees */
    + vibdat *= direction;
    +
    + return vibdat;
    +}
    +
    +static void twl6040_vibra_set_effect(struct vibra_info *info)
    +{
    + struct twl6040 *twl6040 = info->twl6040;
    + u8 vibdatl, vibdatr;
    + int volt;
    +
    + /* weak motor */
    + volt = regulator_get_voltage(info->supplies[0].consumer) / 1000;
    + vibdatl = twl6040_vibra_code(volt, info->vibldrv_res,
    + info->viblmotor_res,
    + info->weak_speed, info->direction);
    +
    + /* strong motor */
    + volt = regulator_get_voltage(info->supplies[1].consumer) / 1000;
    + vibdatr = twl6040_vibra_code(volt, info->vibrdrv_res,
    + info->vibrmotor_res,
    + info->strong_speed, info->direction);
    +
    + twl6040_reg_write(twl6040, TWL6040_REG_VIBDATL, vibdatl);
    + twl6040_reg_write(twl6040, TWL6040_REG_VIBDATR, vibdatr);
    +}
    +
    +static void vibra_play_work(struct work_struct *work)
    +{
    + struct vibra_info *info = container_of(work,
    + struct vibra_info, play_work);
    +
    + mutex_lock(&info->mutex);
    +
    + if (info->weak_speed || info->strong_speed) {
    + if (!info->enabled)
    + twl6040_vibra_enable(info);
    +
    + twl6040_vibra_set_effect(info);
    + } else if (info->enabled)
    + twl6040_vibra_disable(info);
    +
    + mutex_unlock(&info->mutex);
    +}
    +
    +static int vibra_play(struct input_dev *input, void *data,
    + struct ff_effect *effect)
    +{
    + struct vibra_info *info = input_get_drvdata(input);
    + int ret;
    +
    + info->weak_speed = effect->u.rumble.weak_magnitude;
    + info->strong_speed = effect->u.rumble.strong_magnitude;
    + info->direction = effect->direction < EFFECT_DIR_180_DEG ? 1 : -1;
    +
    + ret = queue_work(info->workqueue, &info->play_work);
    + if (!ret) {
    + dev_info(&input->dev, "work is already on queue\n");
    + return ret;
    + }
    +
    + return 0;
    +}
    +
    +static void twl6040_vibra_close(struct input_dev *input)
    +{
    + struct vibra_info *info = input_get_drvdata(input);
    +
    + cancel_work_sync(&info->play_work);
    +
    + mutex_lock(&info->mutex);
    +
    + if (info->enabled)
    + twl6040_vibra_disable(info);
    +
    + mutex_unlock(&info->mutex);
    +}
    +
    +#if CONFIG_PM_SLEEP
    +static int twl6040_vibra_suspend(struct device *dev)
    +{
    + struct platform_device *pdev = to_platform_device(dev);
    + struct vibra_info *info = platform_get_drvdata(pdev);
    +
    + mutex_lock(&info->mutex);
    +
    + if (info->enabled)
    + twl6040_vibra_disable(info);
    +
    + mutex_unlock(&info->mutex);
    +
    + return 0;
    +}
    +
    +#endif
    +
    +static SIMPLE_DEV_PM_OPS(twl6040_vibra_pm_ops, twl6040_vibra_suspend, NULL);
    +
    +static int __devinit twl6040_vibra_probe(struct platform_device *pdev)
    +{
    + struct twl4030_vibra_data *pdata = pdev->dev.platform_data;
    + struct vibra_info *info;
    + int ret;
    +
    + if (!pdata) {
    + dev_err(&pdev->dev, "platform_data not available\n");
    + return -EINVAL;
    + }
    +
    + info = kzalloc(sizeof(*info), GFP_KERNEL);
    + if (!info) {
    + dev_err(&pdev->dev, "couldn't allocate memory\n");
    + return -ENOMEM;
    + }
    +
    + info->dev = &pdev->dev;
    + info->twl6040 = dev_get_drvdata(pdev->dev.parent);
    + info->vibldrv_res = pdata->vibldrv_res;
    + info->vibrdrv_res = pdata->vibrdrv_res;
    + info->viblmotor_res = pdata->viblmotor_res;
    + info->vibrmotor_res = pdata->vibrmotor_res;
    + if ((!info->vibldrv_res && !info->viblmotor_res) ||
    + (!info->vibrdrv_res && !info->vibrmotor_res)) {
    + dev_err(info->dev, "invalid vibra driver/motor resistance\n");
    + ret = -EINVAL;
    + goto err_kzalloc;
    + }
    +
    + mutex_init(&info->mutex);
    +
    + info->input_dev = input_allocate_device();
    + if (info->input_dev == NULL) {
    + dev_err(info->dev, "couldn't allocate input device\n");
    + ret = -ENOMEM;
    + goto err_kzalloc;
    + }
    +
    + input_set_drvdata(info->input_dev, info);
    +
    + info->input_dev->name = "twl6040:vibrator";
    + info->input_dev->id.version = 1;
    + info->input_dev->dev.parent = pdev->dev.parent;
    + info->input_dev->close = twl6040_vibra_close;
    + __set_bit(FF_RUMBLE, info->input_dev->ffbit);
    +
    + ret = input_ff_create_memless(info->input_dev, NULL, vibra_play);
    + if (ret < 0) {
    + dev_err(info->dev, "couldn't register vibrator to FF\n");
    + goto err_ialloc;
    + }
    +
    + ret = input_register_device(info->input_dev);
    + if (ret < 0) {
    + dev_err(info->dev, "couldn't register input device\n");
    + goto err_iff;
    + }
    +
    + platform_set_drvdata(pdev, info);
    +
    + ret = twl6040_request_irq(info->twl6040, TWL6040_IRQ_VIB,
    + twl6040_vib_irq_handler, 0,
    + "twl6040_irq_vib", info);
    + if (ret) {
    + dev_err(info->dev, "VIB IRQ request failed: %d\n", ret);
    + goto err_irq;
    + }
    +
    + info->supplies[0].supply = "vddvibl";
    + info->supplies[1].supply = "vddvibr";
    + ret = regulator_bulk_get(info->dev, ARRAY_SIZE(info->supplies),
    + info->supplies);
    + if (ret) {
    + dev_err(info->dev, "couldn't get regulators %d\n", ret);
    + goto err_regulator;
    + }
    +
    + if (pdata->vddvibl_uV) {
    + ret = regulator_set_voltage(info->supplies[0].consumer,
    + pdata->vddvibl_uV,
    + pdata->vddvibl_uV);
    + if (ret) {
    + dev_err(info->dev, "failed to set VDDVIBL volt %d\n",
    + ret);
    + goto err_voltage;
    + }
    + }
    +
    + if (pdata->vddvibr_uV) {
    + ret = regulator_set_voltage(info->supplies[1].consumer,
    + pdata->vddvibr_uV,
    + pdata->vddvibr_uV);
    + if (ret) {
    + dev_err(info->dev, "failed to set VDDVIBR volt %d\n",
    + ret);
    + goto err_voltage;
    + }
    + }
    +
    + info->workqueue = alloc_workqueue("twl6040-vibra", 0, 0);
    + if (info->workqueue == NULL) {
    + dev_err(info->dev, "couldn't create workqueue\n");
    + ret = -ENOMEM;
    + goto err_voltage;
    + }
    + INIT_WORK(&info->play_work, vibra_play_work);
    +
    + return 0;
    +
    +err_voltage:
    + regulator_bulk_free(ARRAY_SIZE(info->supplies), info->supplies);
    +err_regulator:
    + twl6040_free_irq(info->twl6040, TWL6040_IRQ_VIB, info);
    +err_irq:
    + input_unregister_device(info->input_dev);
    + info->input_dev = NULL;
    +err_iff:
    + if (info->input_dev)
    + input_ff_destroy(info->input_dev);
    +err_ialloc:
    + input_free_device(info->input_dev);
    +err_kzalloc:
    + kfree(info);
    + return ret;
    +}
    +
    +static int __devexit twl6040_vibra_remove(struct platform_device *pdev)
    +{
    + struct vibra_info *info = platform_get_drvdata(pdev);
    +
    + input_unregister_device(info->input_dev);
    + twl6040_free_irq(info->twl6040, TWL6040_IRQ_VIB, info);
    + regulator_bulk_free(ARRAY_SIZE(info->supplies), info->supplies);
    + destroy_workqueue(info->workqueue);
    + kfree(info);
    +
    + return 0;
    +}
    +
    +static struct platform_driver twl6040_vibra_driver = {
    + .probe = twl6040_vibra_probe,
    + .remove = __devexit_p(twl6040_vibra_remove),
    + .driver = {
    + .name = "twl6040-vibra",
    + .owner = THIS_MODULE,
    + .pm = &twl6040_vibra_pm_ops,
    + },
    +};
    +
    +static int __init twl6040_vibra_init(void)
    +{
    + return platform_driver_register(&twl6040_vibra_driver);
    +}
    +module_init(twl6040_vibra_init);
    +
    +static void __exit twl6040_vibra_exit(void)
    +{
    + platform_driver_unregister(&twl6040_vibra_driver);
    +}
    +module_exit(twl6040_vibra_exit);
    +
    +MODULE_ALIAS("platform:twl6040-vibra");
    +MODULE_DESCRIPTION("TWL6040 Vibra driver");
    +MODULE_LICENSE("GPL");
    +MODULE_AUTHOR("Jorge Eduardo Candelaria <jorge.candelaria@ti.com>");
    +MODULE_AUTHOR("Misael Lopez Cruz <misael.lopez@ti.com>");
    diff --git a/include/linux/i2c/twl.h b/include/linux/i2c/twl.h
    index ea5baa2..685fd76 100644
    --- a/include/linux/i2c/twl.h
    +++ b/include/linux/i2c/twl.h
    @@ -669,6 +669,14 @@ struct twl4030_codec_data {

    struct twl4030_vibra_data {
    unsigned int coexist;
    +
    + /* twl6040 */
    + unsigned int vibldrv_res; /* left driver resistance */
    + unsigned int vibrdrv_res; /* right driver resistance */
    + unsigned int viblmotor_res; /* left motor resistance */
    + unsigned int vibrmotor_res; /* right motor resistance */
    + int vddvibl_uV; /* VDDVIBL volt, set 0 for fixed reg */
    + int vddvibr_uV; /* VDDVIBR volt, set 0 for fixed reg */
    };

    struct twl4030_audio_data {
    --
    1.7.5.3


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