summaryrefslogtreecommitdiffstats
path: root/drivers/input/misc/pm8xxx-vibrator.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/input/misc/pm8xxx-vibrator.c')
-rw-r--r--drivers/input/misc/pm8xxx-vibrator.c261
1 files changed, 261 insertions, 0 deletions
diff --git a/drivers/input/misc/pm8xxx-vibrator.c b/drivers/input/misc/pm8xxx-vibrator.c
new file mode 100644
index 0000000000..5c288fe7ac
--- /dev/null
+++ b/drivers/input/misc/pm8xxx-vibrator.c
@@ -0,0 +1,261 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
+ */
+
+#include <linux/errno.h>
+#include <linux/input.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+
+#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_regs {
+ unsigned int enable_addr;
+ unsigned int enable_mask;
+
+ unsigned int drv_addr;
+ unsigned int drv_mask;
+ unsigned int drv_shift;
+ unsigned int drv_en_manual_mask;
+};
+
+static const struct pm8xxx_regs pm8058_regs = {
+ .drv_addr = 0x4A,
+ .drv_mask = 0xf8,
+ .drv_shift = 3,
+ .drv_en_manual_mask = 0xfc,
+};
+
+static struct pm8xxx_regs pm8916_regs = {
+ .enable_addr = 0xc046,
+ .enable_mask = BIT(7),
+ .drv_addr = 0xc041,
+ .drv_mask = 0x1F,
+ .drv_shift = 0,
+ .drv_en_manual_mask = 0,
+};
+
+/**
+ * struct pm8xxx_vib - structure to hold vibrator data
+ * @vib_input_dev: input device supporting force feedback
+ * @work: work structure to set the vibration parameters
+ * @regmap: regmap for register read/write
+ * @regs: registers' info
+ * @speed: speed of vibration set from userland
+ * @active: state of vibrator
+ * @level: level of vibration to set in the chip
+ * @reg_vib_drv: regs->drv_addr register value
+ */
+struct pm8xxx_vib {
+ struct input_dev *vib_input_dev;
+ struct work_struct work;
+ struct regmap *regmap;
+ const struct pm8xxx_regs *regs;
+ int speed;
+ int level;
+ bool active;
+ u8 reg_vib_drv;
+};
+
+/**
+ * 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;
+ unsigned int val = vib->reg_vib_drv;
+ const struct pm8xxx_regs *regs = vib->regs;
+
+ if (on)
+ val |= (vib->level << regs->drv_shift) & regs->drv_mask;
+ else
+ val &= ~regs->drv_mask;
+
+ rc = regmap_write(vib->regmap, regs->drv_addr, val);
+ if (rc < 0)
+ return rc;
+
+ vib->reg_vib_drv = val;
+
+ if (regs->enable_mask)
+ rc = regmap_update_bits(vib->regmap, regs->enable_addr,
+ regs->enable_mask, on ? ~0 : 0);
+
+ return rc;
+}
+
+/**
+ * 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);
+ const struct pm8xxx_regs *regs = vib->regs;
+ int rc;
+ unsigned int val;
+
+ rc = regmap_read(vib->regmap, regs->drv_addr, &val);
+ 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 pm8xxx_vib_probe(struct platform_device *pdev)
+{
+ struct pm8xxx_vib *vib;
+ struct input_dev *input_dev;
+ int error;
+ unsigned int val;
+ const struct pm8xxx_regs *regs;
+
+ vib = devm_kzalloc(&pdev->dev, sizeof(*vib), GFP_KERNEL);
+ if (!vib)
+ return -ENOMEM;
+
+ vib->regmap = dev_get_regmap(pdev->dev.parent, NULL);
+ if (!vib->regmap)
+ return -ENODEV;
+
+ input_dev = devm_input_allocate_device(&pdev->dev);
+ if (!input_dev)
+ return -ENOMEM;
+
+ INIT_WORK(&vib->work, pm8xxx_work_handler);
+ vib->vib_input_dev = input_dev;
+
+ regs = of_device_get_match_data(&pdev->dev);
+
+ /* operate in manual mode */
+ error = regmap_read(vib->regmap, regs->drv_addr, &val);
+ if (error < 0)
+ return error;
+
+ val &= regs->drv_en_manual_mask;
+ error = regmap_write(vib->regmap, regs->drv_addr, val);
+ if (error < 0)
+ return error;
+
+ vib->regs = regs;
+ vib->reg_vib_drv = val;
+
+ input_dev->name = "pm8xxx_vib_ffmemless";
+ input_dev->id.version = 1;
+ 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");
+ return error;
+ }
+
+ error = input_register_device(input_dev);
+ if (error) {
+ dev_err(&pdev->dev, "couldn't register input device\n");
+ return error;
+ }
+
+ platform_set_drvdata(pdev, vib);
+ return 0;
+}
+
+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;
+}
+
+static DEFINE_SIMPLE_DEV_PM_OPS(pm8xxx_vib_pm_ops, pm8xxx_vib_suspend, NULL);
+
+static const struct of_device_id pm8xxx_vib_id_table[] = {
+ { .compatible = "qcom,pm8058-vib", .data = &pm8058_regs },
+ { .compatible = "qcom,pm8921-vib", .data = &pm8058_regs },
+ { .compatible = "qcom,pm8916-vib", .data = &pm8916_regs },
+ { }
+};
+MODULE_DEVICE_TABLE(of, pm8xxx_vib_id_table);
+
+static struct platform_driver pm8xxx_vib_driver = {
+ .probe = pm8xxx_vib_probe,
+ .driver = {
+ .name = "pm8xxx-vib",
+ .pm = pm_sleep_ptr(&pm8xxx_vib_pm_ops),
+ .of_match_table = pm8xxx_vib_id_table,
+ },
+};
+module_platform_driver(pm8xxx_vib_driver);
+
+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>");