Input: add driver for TWL4030 vibrator device
authorJari Vanhala <ext-jari.vanhala@nokia.com>
Tue, 9 Mar 2010 08:29:46 +0000 (00:29 -0800)
committerDmitry Torokhov <dmitry.torokhov@gmail.com>
Tue, 9 Mar 2010 08:30:20 +0000 (00:30 -0800)
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>
drivers/input/misc/Kconfig
drivers/input/misc/Makefile
drivers/input/misc/twl4030-vibra.c [new file with mode: 0644]

index 7097bfe581d7f1a65b921ee0636c778d419a75c2..23140a3bb8e0b1ef4d2ed847a5816dbf48e75628 100644 (file)
@@ -214,6 +214,17 @@ config INPUT_TWL4030_PWRBUTTON
          To compile this driver as a module, choose M here. The module will
          be called twl4030_pwrbutton.
 
+config INPUT_TWL4030_VIBRA
+       tristate "Support for TWL4030 Vibrator"
+       depends on TWL4030_CORE
+       select TWL4030_CODEC
+       select INPUT_FF_MEMLESS
+       help
+         This option enables support for TWL4030 Vibrator Driver.
+
+         To compile this driver as a module, choose M here. The module will
+         be called twl4030_vibra.
+
 config INPUT_UINPUT
        tristate "User level driver support"
        help
index b611615e24ad80dc568cbd2b11db469f0194969b..7e95a5d474dcb64844bb5ce424defe0ca05a0f37 100644 (file)
@@ -26,6 +26,7 @@ obj-$(CONFIG_INPUT_GPIO_ROTARY_ENCODER)       += rotary_encoder.o
 obj-$(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_UINPUT)             += uinput.o
 obj-$(CONFIG_INPUT_WINBOND_CIR)                += winbond-cir.o
 obj-$(CONFIG_INPUT_WISTRON_BTNS)       += wistron_btns.o
diff --git a/drivers/input/misc/twl4030-vibra.c b/drivers/input/misc/twl4030-vibra.c
new file mode 100644 (file)
index 0000000..2fb79e0
--- /dev/null
@@ -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");