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Date: Thu, 05 Jan 2012 19:04:36 +0900
From: Donggeun Kim <dg77.kim@...sung.com>
To: linux-input@...r.kernel.org
Cc: dmitry.torokhov@...il.com, sameo@...ux.intel.com,
broonie@...nsource.wolfsonmicro.com, linux-kernel@...r.kernel.org,
kyungmin.park@...sung.com, myungjoo.ham@...sung.com,
dg77.kim@...sung.com
Subject: [PATCH 2/2] input: add driver support for MAX8997-haptic
The MAX8997-haptic function can be used to control motor.
User can control the haptic driver by using force feedback framework.
This patch supports the haptic function in MAX8997.
Signed-off-by: Donggeun Kim <dg77.kim@...sung.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@...sung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@...sung.com>
---
drivers/input/misc/Kconfig | 12 ++
drivers/input/misc/Makefile | 1 +
drivers/input/misc/max8997_haptic.c | 366 +++++++++++++++++++++++++++++++++++
3 files changed, 379 insertions(+), 0 deletions(-)
create mode 100644 drivers/input/misc/max8997_haptic.c
diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index 22d875f..695e1fd 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -134,6 +134,18 @@ config INPUT_MAX8925_ONKEY
To compile this driver as a module, choose M here: the module
will be called max8925_onkey.
+config INPUT_MAX8997_HAPTIC
+ tristate "MAXIM MAX8997 haptic controller support"
+ depends on HAVE_PWM && MFD_MAX8997
+ select INPUT_FF_MEMLESS
+ help
+ This option enables device driver support for the haptic controller
+ on MAXIM MAX8997 chip. This driver supports ff-memless interface
+ from input framework.
+
+ To compile this driver as module, choose M here: the
+ module will be called max8997-haptic.
+
config INPUT_MC13783_PWRBUTTON
tristate "MC13783 ON buttons"
depends on MFD_MC13783
diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index a244fc6..083df5a 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -28,6 +28,7 @@ obj-$(CONFIG_INPUT_KEYSPAN_REMOTE) += keyspan_remote.o
obj-$(CONFIG_INPUT_KXTJ9) += kxtj9.o
obj-$(CONFIG_INPUT_M68K_BEEP) += m68kspkr.o
obj-$(CONFIG_INPUT_MAX8925_ONKEY) += max8925_onkey.o
+obj-$(CONFIG_INPUT_MAX8997_HAPTIC) += max8997_haptic.o
obj-$(CONFIG_INPUT_MC13783_PWRBUTTON) += mc13783-pwrbutton.o
obj-$(CONFIG_INPUT_MMA8450) += mma8450.o
obj-$(CONFIG_INPUT_MPU3050) += mpu3050.o
diff --git a/drivers/input/misc/max8997_haptic.c b/drivers/input/misc/max8997_haptic.c
new file mode 100644
index 0000000..d7114ad
--- /dev/null
+++ b/drivers/input/misc/max8997_haptic.c
@@ -0,0 +1,366 @@
+/*
+ * max8997_haptic.c - MAX8997-haptic controller driver
+ *
+ * Copyright (C) 2012 Samsung Electronics
+ * Donggeun Kim <dg77.kim@...sung.com>
+ *
+ * This program is not provided / owned by Maxim Integrated Products.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/err.h>
+#include <linux/pwm.h>
+#include <linux/input.h>
+#include <linux/mfd/max8997-private.h>
+#include <linux/mfd/max8997.h>
+#include <linux/regulator/consumer.h>
+
+/* Haptic configuration 2 register */
+#define MAX8997_MOTOR_TYPE_SHIFT 7
+#define MAX8997_ENABLE_SHIFT 6
+#define MAX8997_MODE_SHIFT 5
+
+/* Haptic driver configuration register */
+#define MAX8997_CYCLE_SHIFT 6
+#define MAX8997_SIG_PERIOD_SHIFT 4
+#define MAX8997_SIG_DUTY_SHIFT 2
+#define MAX8997_PWM_DUTY_SHIFT 0
+
+struct max8997_haptic {
+ struct device *dev;
+ struct i2c_client *client;
+ struct input_dev *input_dev;
+ struct regulator *regulator;
+
+ bool enabled;
+
+ int level;
+
+ struct pwm_device *pwm;
+ int pwm_period;
+ enum max8997_haptic_pwm_divisor pwm_divisor;
+
+ enum max8997_haptic_motor_type type;
+ enum max8997_haptic_pulse_mode mode;
+
+ int internal_mode_pattern;
+ int pattern_cycle;
+ int pattern_signal_period;
+};
+
+static int max8997_haptic_set_duty_cycle(struct max8997_haptic *chip)
+{
+ int duty, i;
+ int ret;
+ u8 duty_index;
+
+ if (chip->mode == MAX8997_EXTERNAL_MODE) {
+ duty = chip->pwm_period * chip->level / 100;
+ ret = pwm_config(chip->pwm, duty, chip->pwm_period);
+ } else {
+ for (i = 0; i <= 64; i++) {
+ if (chip->level <= i * 100 / 64) {
+ duty_index = i;
+ break;
+ }
+ }
+ switch (chip->internal_mode_pattern) {
+ case 0:
+ max8997_write_reg(chip->client,
+ MAX8997_HAPTIC_REG_SIGPWMDC1, duty_index);
+ break;
+ case 1:
+ max8997_write_reg(chip->client,
+ MAX8997_HAPTIC_REG_SIGPWMDC2, duty_index);
+ break;
+ case 2:
+ max8997_write_reg(chip->client,
+ MAX8997_HAPTIC_REG_SIGPWMDC3, duty_index);
+ break;
+ case 3:
+ max8997_write_reg(chip->client,
+ MAX8997_HAPTIC_REG_SIGPWMDC4, duty_index);
+ break;
+ default:
+ break;
+ }
+ }
+ return ret;
+}
+
+static void max8997_haptic_configure(struct max8997_haptic *chip)
+{
+ u8 value;
+
+ value = chip->type << MAX8997_MOTOR_TYPE_SHIFT |
+ chip->enabled << MAX8997_ENABLE_SHIFT |
+ chip->mode << MAX8997_MODE_SHIFT | chip->pwm_divisor;
+ max8997_write_reg(chip->client, MAX8997_HAPTIC_REG_CONF2, value);
+
+ if (chip->mode == MAX8997_INTERNAL_MODE && chip->enabled) {
+ value = chip->internal_mode_pattern << MAX8997_CYCLE_SHIFT |
+ chip->internal_mode_pattern << MAX8997_SIG_PERIOD_SHIFT |
+ chip->internal_mode_pattern << MAX8997_SIG_DUTY_SHIFT |
+ chip->internal_mode_pattern << MAX8997_PWM_DUTY_SHIFT;
+ max8997_write_reg(chip->client,
+ MAX8997_HAPTIC_REG_DRVCONF, value);
+
+ switch (chip->internal_mode_pattern) {
+ case 0:
+ value = chip->pattern_cycle << 4;
+ max8997_write_reg(chip->client,
+ MAX8997_HAPTIC_REG_CYCLECONF1, value);
+ value = chip->pattern_signal_period;
+ max8997_write_reg(chip->client,
+ MAX8997_HAPTIC_REG_SIGCONF1, value);
+ break;
+ case 1:
+ value = chip->pattern_cycle;
+ max8997_write_reg(chip->client,
+ MAX8997_HAPTIC_REG_CYCLECONF1, value);
+ value = chip->pattern_signal_period;
+ max8997_write_reg(chip->client,
+ MAX8997_HAPTIC_REG_SIGCONF2, value);
+ break;
+ case 2:
+ value = chip->pattern_cycle << 4;
+ max8997_write_reg(chip->client,
+ MAX8997_HAPTIC_REG_CYCLECONF2, value);
+ value = chip->pattern_signal_period;
+ max8997_write_reg(chip->client,
+ MAX8997_HAPTIC_REG_SIGCONF3, value);
+ break;
+ case 3:
+ value = chip->pattern_cycle;
+ max8997_write_reg(chip->client,
+ MAX8997_HAPTIC_REG_CYCLECONF2, value);
+ value = chip->pattern_signal_period;
+ max8997_write_reg(chip->client,
+ MAX8997_HAPTIC_REG_SIGCONF4, value);
+ break;
+ default:
+ break;
+ }
+ }
+}
+
+static void max8997_haptic_enable(struct max8997_haptic *chip, bool enable)
+{
+ if (chip->enabled == enable)
+ return;
+
+ chip->enabled = enable;
+
+ if (enable) {
+ regulator_enable(chip->regulator);
+ max8997_haptic_configure(chip);
+ if (chip->mode == MAX8997_EXTERNAL_MODE)
+ pwm_enable(chip->pwm);
+ } else {
+ max8997_haptic_configure(chip);
+ if (chip->mode == MAX8997_EXTERNAL_MODE)
+ pwm_disable(chip->pwm);
+ regulator_disable(chip->regulator);
+ }
+}
+
+static void max8997_haptic_close(struct input_dev *dev)
+{
+ struct max8997_haptic *chip = input_get_drvdata(dev);
+
+ if (chip->enabled)
+ max8997_haptic_enable(chip, false);
+}
+
+static int max8997_haptic_play_effect(struct input_dev *dev, void *data,
+ struct ff_effect *effect)
+{
+ struct max8997_haptic *chip = input_get_drvdata(dev);
+ int ret;
+
+ chip->level = effect->u.rumble.strong_magnitude;
+ if (!chip->level)
+ chip->level = effect->u.rumble.weak_magnitude;
+
+ if (chip->level) {
+ ret = max8997_haptic_set_duty_cycle(chip);
+ if (ret) {
+ dev_err(chip->dev, "set_pwm_cycle failed\n");
+ return ret;
+ }
+ max8997_haptic_enable(chip, true);
+ } else {
+ max8997_haptic_enable(chip, false);
+ }
+
+ return 0;
+}
+
+static int __devinit max8997_haptic_probe(struct platform_device *pdev)
+{
+ struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
+ struct max8997_platform_data *pdata = dev_get_platdata(iodev->dev);
+ struct max8997_haptic_platform_data *haptic_pdata =
+ pdata->haptic_pdata;
+ struct max8997_haptic *chip;
+ struct input_dev *input_dev;
+ int ret;
+
+ if (!haptic_pdata) {
+ dev_err(&pdev->dev, "no haptic platform data\n");
+ return -EINVAL;
+ }
+
+ chip = kzalloc(sizeof(struct max8997_haptic), GFP_KERNEL);
+ input_dev = input_allocate_device();
+ if (!chip || !input_dev) {
+ dev_err(&pdev->dev, "unable to allocate memory\n");
+ return -ENOMEM;
+ }
+
+ chip->client = iodev->haptic;
+ chip->dev = &pdev->dev;
+ chip->input_dev = input_dev;
+ chip->pwm_period = haptic_pdata->pwm_period;
+ chip->type = haptic_pdata->type;
+ chip->mode = haptic_pdata->mode;
+ chip->pwm_divisor = haptic_pdata->pwm_divisor;
+ if (chip->mode == MAX8997_INTERNAL_MODE) {
+ chip->internal_mode_pattern =
+ haptic_pdata->internal_mode_pattern;
+ chip->pattern_cycle = haptic_pdata->pattern_cycle;
+ chip->pattern_signal_period =
+ haptic_pdata->pattern_signal_period;
+ }
+
+ if (chip->mode == MAX8997_EXTERNAL_MODE) {
+ chip->pwm = pwm_request(haptic_pdata->pwm_channel_id,
+ "max8997-haptic");
+ if (IS_ERR(chip->pwm)) {
+ dev_err(&pdev->dev,
+ "unable to request PWM for haptic\n");
+ ret = PTR_RET(chip->pwm);
+ goto err_pwm;
+ }
+ }
+
+ chip->regulator = regulator_get(&pdev->dev, "inmotor");
+ if (IS_ERR(chip->regulator)) {
+ dev_err(&pdev->dev, "unable to get regulator\n");
+ ret = PTR_RET(chip->regulator);
+ goto err_regulator;
+ }
+
+ platform_set_drvdata(pdev, chip);
+
+ input_dev->name = "max8997-haptic";
+ input_dev->id.version = 1;
+ input_dev->dev.parent = &pdev->dev;
+ input_dev->close = max8997_haptic_close;
+ input_set_drvdata(input_dev, chip);
+ input_set_capability(input_dev, EV_FF, FF_RUMBLE);
+
+ ret = input_ff_create_memless(input_dev, NULL,
+ max8997_haptic_play_effect);
+ if (ret) {
+ dev_err(&pdev->dev,
+ "unable to create FF device(ret : %d)\n", ret);
+ goto err_ff_memless;
+ }
+
+ ret = input_register_device(input_dev);
+ if (ret) {
+ dev_err(&pdev->dev,
+ "unable to register input device(ret : %d)\n", ret);
+ goto err_input_register;
+ }
+
+ return 0;
+
+err_input_register:
+ input_ff_destroy(input_dev);
+err_ff_memless:
+ regulator_put(chip->regulator);
+err_regulator:
+ if (chip->mode == MAX8997_EXTERNAL_MODE)
+ pwm_free(chip->pwm);
+err_pwm:
+ kfree(chip);
+
+ return ret;
+}
+
+static int __devexit max8997_haptic_remove(struct platform_device *pdev)
+{
+ struct max8997_haptic *chip = platform_get_drvdata(pdev);
+
+ input_unregister_device(chip->input_dev);
+ regulator_put(chip->regulator);
+
+ if (chip->mode == MAX8997_EXTERNAL_MODE)
+ pwm_free(chip->pwm);
+
+ kfree(chip);
+
+ return 0;
+}
+
+static int max8997_haptic_suspend(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct max8997_haptic *chip = platform_get_drvdata(pdev);
+
+ max8997_haptic_enable(chip, false);
+
+ return 0;
+}
+
+static int max8997_haptic_resume(struct device *dev)
+{
+ return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(max8997_haptic_pm_ops, max8997_haptic_suspend,
+ max8997_haptic_resume);
+
+static const struct platform_device_id max8997_haptic_id[] = {
+ { "max8997-haptic", 0 },
+ { },
+};
+MODULE_DEVICE_TABLE(i2c, max8997_haptic_id);
+
+static struct platform_driver max8997_haptic_driver = {
+ .driver = {
+ .name = "max8997-haptic",
+ .owner = THIS_MODULE,
+ .pm = &max8997_haptic_pm_ops,
+ },
+ .probe = max8997_haptic_probe,
+ .remove = __devexit_p(max8997_haptic_remove),
+ .id_table = max8997_haptic_id,
+};
+
+module_platform_driver(max8997_haptic_driver);
+
+MODULE_ALIAS("platform:max8997-haptic");
+MODULE_AUTHOR("Donggeun Kim <dg77.kim@...sung.com>");
+MODULE_DESCRIPTION("max8997_haptic driver");
+MODULE_LICENSE("GPL");
--
1.7.4.1
--
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