Input: add driver for TWL4030 vibrator device

TWL4030 Vibrator implemented via Force Feedback interface.
This uses MFD TWL4030 codec and own dynamic workqueue.

Signed-off-by: Jari Vanhala <ext-jari.vanhala@nokia.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 297 insertions, 0 deletions

diff --git a/drivers/input/misc/twl4030-vibra.c b/drivers/input/misc/twl4030-vibra.c
new file mode 100644
index 000000000000..2fb79e064da3
--- /dev/null
+++ b/drivers/input/misc/twl4030-vibra.c
@@ -0,0 +1,297 @@
+/*
+ * twl4030-vibra.c - TWL4030 Vibrator driver
+ *
+ * Copyright (C) 2008-2010 Nokia Corporation
+ *
+ * Written by Henrik Saari <henrik.saari@nokia.com>
+ * Updates by Felipe Balbi <felipe.balbi@nokia.com>
+ * Input by Jari Vanhala <ext-jari.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/jiffies.h>
+#include <linux/platform_device.h>
+#include <linux/workqueue.h>
+#include <linux/i2c/twl.h>
+#include <linux/mfd/twl4030-codec.h>
+#include <linux/input.h>
+
+/* MODULE ID2 */
+#define LEDEN           0x00
+
+/* ForceFeedback */
+#define EFFECT_DIR_180_DEG      0x8000 /* range is 0 - 0xFFFF */
+
+struct vibra_info {
+        struct device           *dev;
+        struct input_dev        *input_dev;
+
+        struct workqueue_struct *workqueue;
+        struct work_struct      play_work;
+
+        bool                    enabled;
+        int                     speed;
+        int                     direction;
+
+        bool                    coexist;
+};
+
+static void vibra_disable_leds(void)
+{
+        u8 reg;
+
+        /* Disable LEDA & LEDB, cannot be used with vibra (PWM) */
+        twl_i2c_read_u8(TWL4030_MODULE_LED, &reg, LEDEN);
+        reg &= ~0x03;
+        twl_i2c_write_u8(TWL4030_MODULE_LED, LEDEN, reg);
+}
+
+/* Powers H-Bridge and enables audio clk */
+static void vibra_enable(struct vibra_info *info)
+{
+        u8 reg;
+
+        twl4030_codec_enable_resource(TWL4030_CODEC_RES_POWER);
+
+        /* turn H-Bridge on */
+        twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE,
+                        &reg, TWL4030_REG_VIBRA_CTL);
+        twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
+                         (reg | TWL4030_VIBRA_EN), TWL4030_REG_VIBRA_CTL);
+
+        twl4030_codec_enable_resource(TWL4030_CODEC_RES_APLL);
+
+        info->enabled = true;
+}
+
+static void vibra_disable(struct vibra_info *info)
+{
+        u8 reg;
+
+        /* Power down H-Bridge */
+        twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE,
+                        &reg, TWL4030_REG_VIBRA_CTL);
+        twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
+                         (reg & ~TWL4030_VIBRA_EN), TWL4030_REG_VIBRA_CTL);
+
+        twl4030_codec_disable_resource(TWL4030_CODEC_RES_POWER);
+        twl4030_codec_disable_resource(TWL4030_CODEC_RES_APLL);
+
+        info->enabled = false;
+}
+
+static void vibra_play_work(struct work_struct *work)
+{
+        struct vibra_info *info = container_of(work,
+                        struct vibra_info, play_work);
+        int dir;
+        int pwm;
+        u8 reg;
+
+        dir = info->direction;
+        pwm = info->speed;
+
+        twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE,
+                        &reg, TWL4030_REG_VIBRA_CTL);
+        if (pwm && (!info->coexist || !(reg & TWL4030_VIBRA_SEL))) {
+
+                if (!info->enabled)
+                        vibra_enable(info);
+
+                /* set vibra rotation direction */
+                twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE,
+                                &reg, TWL4030_REG_VIBRA_CTL);
+                reg = (dir) ? (reg | TWL4030_VIBRA_DIR) :
+                        (reg & ~TWL4030_VIBRA_DIR);
+                twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
+                                 reg, TWL4030_REG_VIBRA_CTL);
+
+                /* set PWM, 1 = max, 255 = min */
+                twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
+                                 256 - pwm, TWL4030_REG_VIBRA_SET);
+        } else {
+                if (info->enabled)
+                        vibra_disable(info);
+        }
+}
+
+/*** Input/ForceFeedback ***/
+
+static int vibra_play(struct input_dev *input, void *data,
+                      struct ff_effect *effect)
+{
+        struct vibra_info *info = input_get_drvdata(input);
+
+        info->speed = effect->u.rumble.strong_magnitude >> 8;
+        if (!info->speed)
+                info->speed = effect->u.rumble.weak_magnitude >> 9;
+        info->direction = effect->direction < EFFECT_DIR_180_DEG ? 0 : 1;
+        queue_work(info->workqueue, &info->play_work);
+        return 0;
+}
+
+static int twl4030_vibra_open(struct input_dev *input)
+{
+        struct vibra_info *info = input_get_drvdata(input);
+
+        info->workqueue = create_singlethread_workqueue("vibra");
+        if (info->workqueue == NULL) {
+                dev_err(&input->dev, "couldn't create workqueue\n");
+                return -ENOMEM;
+        }
+        return 0;
+}
+
+static void twl4030_vibra_close(struct input_dev *input)
+{
+        struct vibra_info *info = input_get_drvdata(input);
+
+        cancel_work_sync(&info->play_work);
+        INIT_WORK(&info->play_work, vibra_play_work); /* cleanup */
+        destroy_workqueue(info->workqueue);
+        info->workqueue = NULL;
+
+        if (info->enabled)
+                vibra_disable(info);
+}
+
+/*** Module ***/
+#if CONFIG_PM
+static int twl4030_vibra_suspend(struct device *dev)
+{
+        struct platform_device *pdev = to_platform_device(dev);
+        struct vibra_info *info = platform_get_drvdata(pdev);
+
+        if (info->enabled)
+                vibra_disable(info);
+
+        return 0;
+}
+
+static int twl4030_vibra_resume(struct device *dev)
+{
+        vibra_disable_leds();
+        return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(twl4030_vibra_pm_ops,
+                         twl4030_vibra_suspend, twl4030_vibra_resume);
+#endif
+
+static int __devinit twl4030_vibra_probe(struct platform_device *pdev)
+{
+        struct twl4030_codec_vibra_data *pdata = pdev->dev.platform_data;
+        struct vibra_info *info;
+        int ret;
+
+        if (!pdata) {
+                dev_dbg(&pdev->dev, "platform_data not available\n");
+                return -EINVAL;
+        }
+
+        info = kzalloc(sizeof(*info), GFP_KERNEL);
+        if (!info)
+                return -ENOMEM;
+
+        info->dev = &pdev->dev;
+        info->coexist = pdata->coexist;
+        INIT_WORK(&info->play_work, vibra_play_work);
+
+        info->input_dev = input_allocate_device();
+        if (info->input_dev == NULL) {
+                dev_err(&pdev->dev, "couldn't allocate input device\n");
+                ret = -ENOMEM;
+                goto err_kzalloc;
+        }
+
+        input_set_drvdata(info->input_dev, info);
+
+        info->input_dev->name = "twl4030:vibrator";
+        info->input_dev->id.version = 1;
+        info->input_dev->dev.parent = pdev->dev.parent;
+        info->input_dev->open = twl4030_vibra_open;
+        info->input_dev->close = twl4030_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_dbg(&pdev->dev, "couldn't register vibrator to FF\n");
+                goto err_ialloc;
+        }
+
+        ret = input_register_device(info->input_dev);
+        if (ret < 0) {
+                dev_dbg(&pdev->dev, "couldn't register input device\n");
+                goto err_iff;
+        }
+
+        vibra_disable_leds();
+
+        platform_set_drvdata(pdev, info);
+        return 0;
+
+err_iff:
+        input_ff_destroy(info->input_dev);
+err_ialloc:
+        input_free_device(info->input_dev);
+err_kzalloc:
+        kfree(info);
+        return ret;
+}
+
+static int __devexit twl4030_vibra_remove(struct platform_device *pdev)
+{
+        struct vibra_info *info = platform_get_drvdata(pdev);
+
+        /* this also free ff-memless and calls close if needed */
+        input_unregister_device(info->input_dev);
+        kfree(info);
+        platform_set_drvdata(pdev, NULL);
+
+        return 0;
+}
+
+static struct platform_driver twl4030_vibra_driver = {
+        .probe          = twl4030_vibra_probe,
+        .remove         = __devexit_p(twl4030_vibra_remove),
+        .driver         = {
+                .name   = "twl4030_codec_vibra",
+                .owner  = THIS_MODULE,
+#ifdef CONFIG_PM
+                .pm     = &twl4030_vibra_pm_ops,
+#endif
+        },
+};
+
+static int __init twl4030_vibra_init(void)
+{
+        return platform_driver_register(&twl4030_vibra_driver);
+}
+module_init(twl4030_vibra_init);
+
+static void __exit twl4030_vibra_exit(void)
+{
+        platform_driver_unregister(&twl4030_vibra_driver);
+}
+module_exit(twl4030_vibra_exit);
+
+MODULE_ALIAS("platform:twl4030_codec_vibra");
+
+MODULE_DESCRIPTION("TWL4030 Vibra driver");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Nokia Corporation");