diff options
Diffstat (limited to 'drivers/input/misc/max8997_haptic.c')
| -rw-r--r-- | drivers/input/misc/max8997_haptic.c | 420 |
1 files changed, 420 insertions, 0 deletions
diff --git a/drivers/input/misc/max8997_haptic.c b/drivers/input/misc/max8997_haptic.c new file mode 100644 index 000000000..99bc76288 --- /dev/null +++ b/drivers/input/misc/max8997_haptic.c @@ -0,0 +1,420 @@ +/* + * MAX8997-haptic controller driver + * + * Copyright (C) 2012 Samsung Electronics + * Donggeun Kim <dg77.kim@samsung.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/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; + + struct work_struct work; + struct mutex mutex; + + bool enabled; + unsigned int level; + + struct pwm_device *pwm; + unsigned int pwm_period; + enum max8997_haptic_pwm_divisor pwm_divisor; + + enum max8997_haptic_motor_type type; + enum max8997_haptic_pulse_mode mode; + + unsigned int internal_mode_pattern; + unsigned int pattern_cycle; + unsigned int pattern_signal_period; +}; + +static int max8997_haptic_set_duty_cycle(struct max8997_haptic *chip) +{ + int ret = 0; + + if (chip->mode == MAX8997_EXTERNAL_MODE) { + unsigned int duty = chip->pwm_period * chip->level / 100; + ret = pwm_config(chip->pwm, duty, chip->pwm_period); + } else { + int i; + u8 duty_index = 0; + + 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) +{ + int error; + + mutex_lock(&chip->mutex); + + error = max8997_haptic_set_duty_cycle(chip); + if (error) { + dev_err(chip->dev, "set_pwm_cycle failed, error: %d\n", error); + goto out; + } + + if (!chip->enabled) { + error = regulator_enable(chip->regulator); + if (error) { + dev_err(chip->dev, "Failed to enable regulator\n"); + goto out; + } + max8997_haptic_configure(chip); + if (chip->mode == MAX8997_EXTERNAL_MODE) { + error = pwm_enable(chip->pwm); + if (error) { + dev_err(chip->dev, "Failed to enable PWM\n"); + regulator_disable(chip->regulator); + goto out; + } + } + chip->enabled = true; + } + +out: + mutex_unlock(&chip->mutex); +} + +static void max8997_haptic_disable(struct max8997_haptic *chip) +{ + mutex_lock(&chip->mutex); + + if (chip->enabled) { + chip->enabled = false; + max8997_haptic_configure(chip); + if (chip->mode == MAX8997_EXTERNAL_MODE) + pwm_disable(chip->pwm); + regulator_disable(chip->regulator); + } + + mutex_unlock(&chip->mutex); +} + +static void max8997_haptic_play_effect_work(struct work_struct *work) +{ + struct max8997_haptic *chip = + container_of(work, struct max8997_haptic, work); + + if (chip->level) + max8997_haptic_enable(chip); + else + max8997_haptic_disable(chip); +} + +static int max8997_haptic_play_effect(struct input_dev *dev, void *data, + struct ff_effect *effect) +{ + struct max8997_haptic *chip = input_get_drvdata(dev); + + chip->level = effect->u.rumble.strong_magnitude; + if (!chip->level) + chip->level = effect->u.rumble.weak_magnitude; + + schedule_work(&chip->work); + + return 0; +} + +static void max8997_haptic_close(struct input_dev *dev) +{ + struct max8997_haptic *chip = input_get_drvdata(dev); + + cancel_work_sync(&chip->work); + max8997_haptic_disable(chip); +} + +static int max8997_haptic_probe(struct platform_device *pdev) +{ + struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent); + const struct max8997_platform_data *pdata = + dev_get_platdata(iodev->dev); + const struct max8997_haptic_platform_data *haptic_pdata = NULL; + struct max8997_haptic *chip; + struct input_dev *input_dev; + int error; + + if (pdata) + haptic_pdata = pdata->haptic_pdata; + + 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"); + error = -ENOMEM; + goto err_free_mem; + } + + INIT_WORK(&chip->work, max8997_haptic_play_effect_work); + mutex_init(&chip->mutex); + + 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; + + switch (chip->mode) { + case 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; + break; + + case MAX8997_EXTERNAL_MODE: + chip->pwm = pwm_request(haptic_pdata->pwm_channel_id, + "max8997-haptic"); + if (IS_ERR(chip->pwm)) { + error = PTR_ERR(chip->pwm); + dev_err(&pdev->dev, + "unable to request PWM for haptic, error: %d\n", + error); + goto err_free_mem; + } + + /* + * FIXME: pwm_apply_args() should be removed when switching to + * the atomic PWM API. + */ + pwm_apply_args(chip->pwm); + break; + + default: + dev_err(&pdev->dev, + "Invalid chip mode specified (%d)\n", chip->mode); + error = -EINVAL; + goto err_free_mem; + } + + chip->regulator = regulator_get(&pdev->dev, "inmotor"); + if (IS_ERR(chip->regulator)) { + error = PTR_ERR(chip->regulator); + dev_err(&pdev->dev, + "unable to get regulator, error: %d\n", + error); + goto err_free_pwm; + } + + 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); + + error = input_ff_create_memless(input_dev, NULL, + max8997_haptic_play_effect); + if (error) { + dev_err(&pdev->dev, + "unable to create FF device, error: %d\n", + error); + goto err_put_regulator; + } + + error = input_register_device(input_dev); + if (error) { + dev_err(&pdev->dev, + "unable to register input device, error: %d\n", + error); + goto err_destroy_ff; + } + + platform_set_drvdata(pdev, chip); + return 0; + +err_destroy_ff: + input_ff_destroy(input_dev); +err_put_regulator: + regulator_put(chip->regulator); +err_free_pwm: + if (chip->mode == MAX8997_EXTERNAL_MODE) + pwm_free(chip->pwm); +err_free_mem: + input_free_device(input_dev); + kfree(chip); + + return error; +} + +static int 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 __maybe_unused max8997_haptic_suspend(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct max8997_haptic *chip = platform_get_drvdata(pdev); + + max8997_haptic_disable(chip); + + return 0; +} + +static SIMPLE_DEV_PM_OPS(max8997_haptic_pm_ops, max8997_haptic_suspend, NULL); + +static const struct platform_device_id max8997_haptic_id[] = { + { "max8997-haptic", 0 }, + { }, +}; +MODULE_DEVICE_TABLE(platform, max8997_haptic_id); + +static struct platform_driver max8997_haptic_driver = { + .driver = { + .name = "max8997-haptic", + .pm = &max8997_haptic_pm_ops, + }, + .probe = max8997_haptic_probe, + .remove = max8997_haptic_remove, + .id_table = max8997_haptic_id, +}; +module_platform_driver(max8997_haptic_driver); + +MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>"); +MODULE_DESCRIPTION("max8997_haptic driver"); +MODULE_LICENSE("GPL"); |