--- /dev/null
+/* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only 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/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/platform_device.h>
+#include <linux/input.h>
+#include <linux/slab.h>
+#include <linux/mfd/pm8xxx/core.h>
+
+#define VIB_DRV 0x4A
+
+#define VIB_DRV_SEL_MASK 0xf8
+#define VIB_DRV_SEL_SHIFT 0x03
+#define VIB_DRV_EN_MANUAL_MASK 0xfc
+
+#define VIB_MAX_LEVEL_mV (3100)
+#define VIB_MIN_LEVEL_mV (1200)
+#define VIB_MAX_LEVELS (VIB_MAX_LEVEL_mV - VIB_MIN_LEVEL_mV)
+
+#define MAX_FF_SPEED 0xff
+
+/**
+ * struct pm8xxx_vib - structure to hold vibrator data
+ * @vib_input_dev: input device supporting force feedback
+ * @work: work structure to set the vibration parameters
+ * @dev: device supporting force feedback
+ * @speed: speed of vibration set from userland
+ * @active: state of vibrator
+ * @level: level of vibration to set in the chip
+ * @reg_vib_drv: VIB_DRV register value
+ */
+struct pm8xxx_vib {
+ struct input_dev *vib_input_dev;
+ struct work_struct work;
+ struct device *dev;
+ int speed;
+ int level;
+ bool active;
+ u8 reg_vib_drv;
+};
+
+/**
+ * pm8xxx_vib_read_u8 - helper to read a byte from pmic chip
+ * @vib: pointer to vibrator structure
+ * @data: placeholder for data to be read
+ * @reg: register address
+ */
+static int pm8xxx_vib_read_u8(struct pm8xxx_vib *vib,
+ u8 *data, u16 reg)
+{
+ int rc;
+
+ rc = pm8xxx_readb(vib->dev->parent, reg, data);
+ if (rc < 0)
+ dev_warn(vib->dev, "Error reading pm8xxx reg 0x%x(0x%x)\n",
+ reg, rc);
+ return rc;
+}
+
+/**
+ * pm8xxx_vib_write_u8 - helper to write a byte to pmic chip
+ * @vib: pointer to vibrator structure
+ * @data: data to write
+ * @reg: register address
+ */
+static int pm8xxx_vib_write_u8(struct pm8xxx_vib *vib,
+ u8 data, u16 reg)
+{
+ int rc;
+
+ rc = pm8xxx_writeb(vib->dev->parent, reg, data);
+ if (rc < 0)
+ dev_warn(vib->dev, "Error writing pm8xxx reg 0x%x(0x%x)\n",
+ reg, rc);
+ return rc;
+}
+
+/**
+ * pm8xxx_vib_set - handler to start/stop vibration
+ * @vib: pointer to vibrator structure
+ * @on: state to set
+ */
+static int pm8xxx_vib_set(struct pm8xxx_vib *vib, bool on)
+{
+ int rc;
+ u8 val = vib->reg_vib_drv;
+
+ if (on)
+ val |= ((vib->level << VIB_DRV_SEL_SHIFT) & VIB_DRV_SEL_MASK);
+ else
+ val &= ~VIB_DRV_SEL_MASK;
+
+ rc = pm8xxx_vib_write_u8(vib, val, VIB_DRV);
+ if (rc < 0)
+ return rc;
+
+ vib->reg_vib_drv = val;
+ return 0;
+}
+
+/**
+ * pm8xxx_work_handler - worker to set vibration level
+ * @work: pointer to work_struct
+ */
+static void pm8xxx_work_handler(struct work_struct *work)
+{
+ struct pm8xxx_vib *vib = container_of(work, struct pm8xxx_vib, work);
+ int rc;
+ u8 val;
+
+ rc = pm8xxx_vib_read_u8(vib, &val, VIB_DRV);
+ if (rc < 0)
+ return;
+
+ /*
+ * pmic vibrator supports voltage ranges from 1.2 to 3.1V, so
+ * scale the level to fit into these ranges.
+ */
+ if (vib->speed) {
+ vib->active = true;
+ vib->level = ((VIB_MAX_LEVELS * vib->speed) / MAX_FF_SPEED) +
+ VIB_MIN_LEVEL_mV;
+ vib->level /= 100;
+ } else {
+ vib->active = false;
+ vib->level = VIB_MIN_LEVEL_mV / 100;
+ }
+
+ pm8xxx_vib_set(vib, vib->active);
+}
+
+/**
+ * pm8xxx_vib_close - callback of input close callback
+ * @dev: input device pointer
+ *
+ * Turns off the vibrator.
+ */
+static void pm8xxx_vib_close(struct input_dev *dev)
+{
+ struct pm8xxx_vib *vib = input_get_drvdata(dev);
+
+ cancel_work_sync(&vib->work);
+ if (vib->active)
+ pm8xxx_vib_set(vib, false);
+}
+
+/**
+ * pm8xxx_vib_play_effect - function to handle vib effects.
+ * @dev: input device pointer
+ * @data: data of effect
+ * @effect: effect to play
+ *
+ * Currently this driver supports only rumble effects.
+ */
+static int pm8xxx_vib_play_effect(struct input_dev *dev, void *data,
+ struct ff_effect *effect)
+{
+ struct pm8xxx_vib *vib = input_get_drvdata(dev);
+
+ vib->speed = effect->u.rumble.strong_magnitude >> 8;
+ if (!vib->speed)
+ vib->speed = effect->u.rumble.weak_magnitude >> 9;
+
+ schedule_work(&vib->work);
+
+ return 0;
+}
+
+static int __devinit pm8xxx_vib_probe(struct platform_device *pdev)
+
+{
+ struct pm8xxx_vib *vib;
+ struct input_dev *input_dev;
+ int error;
+ u8 val;
+
+ vib = kzalloc(sizeof(*vib), GFP_KERNEL);
+ input_dev = input_allocate_device();
+ if (!vib || !input_dev) {
+ dev_err(&pdev->dev, "couldn't allocate memory\n");
+ error = -ENOMEM;
+ goto err_free_mem;
+ }
+
+ INIT_WORK(&vib->work, pm8xxx_work_handler);
+ vib->dev = &pdev->dev;
+ vib->vib_input_dev = input_dev;
+
+ /* operate in manual mode */
+ error = pm8xxx_vib_read_u8(vib, &val, VIB_DRV);
+ if (error < 0)
+ goto err_free_mem;
+ val &= ~VIB_DRV_EN_MANUAL_MASK;
+ error = pm8xxx_vib_write_u8(vib, val, VIB_DRV);
+ if (error < 0)
+ goto err_free_mem;
+
+ vib->reg_vib_drv = val;
+
+ input_dev->name = "pm8xxx_vib_ffmemless";
+ input_dev->id.version = 1;
+ input_dev->dev.parent = &pdev->dev;
+ input_dev->close = pm8xxx_vib_close;
+ input_set_drvdata(input_dev, vib);
+ input_set_capability(vib->vib_input_dev, EV_FF, FF_RUMBLE);
+
+ error = input_ff_create_memless(input_dev, NULL,
+ pm8xxx_vib_play_effect);
+ if (error) {
+ dev_err(&pdev->dev,
+ "couldn't register vibrator as FF device\n");
+ goto err_free_mem;
+ }
+
+ error = input_register_device(input_dev);
+ if (error) {
+ dev_err(&pdev->dev, "couldn't register input device\n");
+ goto err_destroy_memless;
+ }
+
+ platform_set_drvdata(pdev, vib);
+ return 0;
+
+err_destroy_memless:
+ input_ff_destroy(input_dev);
+err_free_mem:
+ input_free_device(input_dev);
+ kfree(vib);
+
+ return error;
+}
+
+static int __devexit pm8xxx_vib_remove(struct platform_device *pdev)
+{
+ struct pm8xxx_vib *vib = platform_get_drvdata(pdev);
+
+ input_unregister_device(vib->vib_input_dev);
+ kfree(vib);
+
+ platform_set_drvdata(pdev, NULL);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int pm8xxx_vib_suspend(struct device *dev)
+{
+ struct pm8xxx_vib *vib = dev_get_drvdata(dev);
+
+ /* Turn off the vibrator */
+ pm8xxx_vib_set(vib, false);
+
+ return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(pm8xxx_vib_pm_ops, pm8xxx_vib_suspend, NULL);
+
+static struct platform_driver pm8xxx_vib_driver = {
+ .probe = pm8xxx_vib_probe,
+ .remove = __devexit_p(pm8xxx_vib_remove),
+ .driver = {
+ .name = "pm8xxx-vib",
+ .owner = THIS_MODULE,
+ .pm = &pm8xxx_vib_pm_ops,
+ },
+};
+
+static int __init pm8xxx_vib_init(void)
+{
+ return platform_driver_register(&pm8xxx_vib_driver);
+}
+module_init(pm8xxx_vib_init);
+
+static void __exit pm8xxx_vib_exit(void)
+{
+ platform_driver_unregister(&pm8xxx_vib_driver);
+}
+module_exit(pm8xxx_vib_exit);
+
+MODULE_ALIAS("platform:pm8xxx_vib");
+MODULE_DESCRIPTION("PMIC8xxx vibrator driver based on ff-memless framework");
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Amy Maloche <amaloche@codeaurora.org>");
projects / deliverable / linux.git / commitdiff
