| Message ID | 20170502162726.11577-2-sebastian.reichel@collabora.co.uk (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
Hi Sebastian, On Tue, May 02, 2017 at 06:27:25PM +0200, Sebastian Reichel wrote: > Provide a simple driver for PWM controllable vibrators. It > will be used by Motorola Droid 4. > > Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk> > --- > .../devicetree/bindings/input/pwm-vibrator.txt | 60 ++++ > drivers/input/misc/Kconfig | 11 + > drivers/input/misc/Makefile | 1 + > drivers/input/misc/pwm-vibra.c | 348 +++++++++++++++++++++ > 4 files changed, 420 insertions(+) > create mode 100644 Documentation/devicetree/bindings/input/pwm-vibrator.txt > create mode 100644 drivers/input/misc/pwm-vibra.c > > diff --git a/Documentation/devicetree/bindings/input/pwm-vibrator.txt b/Documentation/devicetree/bindings/input/pwm-vibrator.txt > new file mode 100644 > index 000000000000..c35be4691366 > --- /dev/null > +++ b/Documentation/devicetree/bindings/input/pwm-vibrator.txt > @@ -0,0 +1,60 @@ > +* PWM vibrator device tree bindings > + > +Registers a PWM device as vibrator. > + > +Required properties: > +- compatible: should be > + * "pwm-vibrator" > + For vibrators controlled using the PWM channel's duty cycle (higher duty means > + the vibrator becomes stronger). > + * "motorola,mapphone-pwm-vibrator" > + For vibrator found in Motorola Droid 4. This vibrator generates a pulse for > + every rising edge, so its controlled using a duty cycle of 50% and changing > + the period time. > +- pwm-names: Should contain "enable" and optionally "direction" > +- pwms: Should contain a PWM handle for each entry in pwm-names > + > +Example from Motorola Droid 4: > + > +&omap4_pmx_core { > + vibrator_direction_pin: pinmux_vibrator_direction_pin { > + pinctrl-single,pins = < > + OMAP4_IOPAD(0x1ce, PIN_OUTPUT | MUX_MODE1) /* dmtimer8_pwm_evt (gpio_27) */ > + >; > + }; > + > + vibrator_enable_pin: pinmux_vibrator_enable_pin { > + pinctrl-single,pins = < > + OMAP4_IOPAD(0X1d0, PIN_OUTPUT | MUX_MODE1) /* dmtimer9_pwm_evt (gpio_28) */ > + >; > + }; > +}; > + > +/ { > + pwm8: dmtimer-pwm { > + pinctrl-names = "default"; > + pinctrl-0 = <&vibrator_direction_pin>; > + > + compatible = "ti,omap-dmtimer-pwm"; > + #pwm-cells = <3>; > + ti,timers = <&timer8>; > + ti,clock-source = <0x01>; > + }; > + > + pwm9: dmtimer-pwm { > + pinctrl-names = "default"; > + pinctrl-0 = <&vibrator_enable_pin>; > + > + compatible = "ti,omap-dmtimer-pwm"; > + #pwm-cells = <3>; > + ti,timers = <&timer9>; > + ti,clock-source = <0x01>; > + }; > + > + vibrator { > + compatible = "pwm-vibrator"; > + pwms = <&pwm8 0 1000000000 0>, > + <&pwm9 0 1000000000 0>; > + pwm-names = "enable", "direction"; > + }; > +}; > diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig > index 5b6c52210d20..d8e0b25eb217 100644 > --- a/drivers/input/misc/Kconfig > +++ b/drivers/input/misc/Kconfig > @@ -571,6 +571,17 @@ config INPUT_PWM_BEEPER > To compile this driver as a module, choose M here: the module will be > called pwm-beeper. > > +config INPUT_PWM_VIBRA > + tristate "PWM vibrator support" > + depends on PWM > + help > + Say Y here to get support for PWM based vibrator devices. > + > + If unsure, say N. > + > + To compile this driver as a module, choose M here: the module will be > + called pwm-vibra. > + > config INPUT_GPIO_ROTARY_ENCODER > tristate "Rotary encoders connected to GPIO pins" > depends on GPIOLIB || COMPILE_TEST > diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile > index b10523f2878e..9a6517f5458c 100644 > --- a/drivers/input/misc/Makefile > +++ b/drivers/input/misc/Makefile > @@ -58,6 +58,7 @@ obj-$(CONFIG_INPUT_PM8XXX_VIBRATOR) += pm8xxx-vibrator.o > obj-$(CONFIG_INPUT_PMIC8XXX_PWRKEY) += pmic8xxx-pwrkey.o > obj-$(CONFIG_INPUT_POWERMATE) += powermate.o > obj-$(CONFIG_INPUT_PWM_BEEPER) += pwm-beeper.o > +obj-$(CONFIG_INPUT_PWM_VIBRA) += pwm-vibra.o > obj-$(CONFIG_INPUT_RB532_BUTTON) += rb532_button.o > obj-$(CONFIG_INPUT_REGULATOR_HAPTIC) += regulator-haptic.o > obj-$(CONFIG_INPUT_RETU_PWRBUTTON) += retu-pwrbutton.o > diff --git a/drivers/input/misc/pwm-vibra.c b/drivers/input/misc/pwm-vibra.c > new file mode 100644 > index 000000000000..a7d36d88679a > --- /dev/null > +++ b/drivers/input/misc/pwm-vibra.c > @@ -0,0 +1,348 @@ > +/* > + * PWM vibrator driver > + * > + * Copyright (C) 2017 Collabora Ltd. > + * > + * Based on previous work from: > + * Copyright (C) 2012 Dmitry Torokhov <dmitry.torokhov@gmail.com> > + * > + * Based on PWM beeper driver: > + * Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de> > + * > + * 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. > + */ > + > +#define DEBUG > + > +#include <linux/input.h> > +#include <linux/kernel.h> > +#include <linux/module.h> > +#include <linux/of_device.h> > +#include <linux/platform_device.h> > +#include <linux/pwm.h> > +#include <linux/regulator/consumer.h> > +#include <linux/slab.h> > + > +/** > + * Motorola Droid 4 (also known as mapphone), has a vibrator, which pulses > + * 1x on rising edge. Increasing the pwm period results in more pulses per > + * second, but reduces intensity. There is also a second channel to control > + * the vibrator's rotation direction to increase effect. The following > + * numbers were determined manually. Going below 12.5 Hz means, clearly > + * noticeable pauses and at 30 Hz the vibration is just barely noticable > + * anymore. > + */ > +#define MAPPHONE_MIN_FREQ 125 /* 12.5 Hz */ > +#define MAPPHONE_MAX_FREQ 300 /* 30.0 Hz */ > + > +struct pwm_vibrator_hw { > + void (*setup_pwm)(u16 level, struct pwm_state *); > + void (*setup_pwm_dir)(u16 level, struct pwm_state *); > +}; > + > +struct pwm_vibrator { > + struct input_dev *input; > + struct pwm_device *pwm; > + struct pwm_device *pwm_dir; > + struct regulator *vcc; > + > + struct work_struct play_work; > + u16 level; > + > + const struct pwm_vibrator_hw *hw; > +}; > + > +static void pwm_vibrator_setup_generic(u16 level, struct pwm_state *state) > +{ > + /* period is configured by platform, duty cycle controls strength */ > + pwm_set_relative_duty_cycle(state, level, 0xffff); > +} > + > +static void pwm_vibrator_setup_dir_generic(u16 level, struct pwm_state *state) > +{ > + /* period is configured by platform, duty cycle controls strength */ > + pwm_set_relative_duty_cycle(state, 50, 100); > +} > + > +static struct pwm_vibrator_hw pwm_vib_hw_generic = { > + .setup_pwm = pwm_vibrator_setup_generic, > + .setup_pwm_dir = pwm_vibrator_setup_dir_generic, > +}; > + > +static void pwm_vibrator_setup_mapphone(u16 level, struct pwm_state *state) > +{ > + unsigned int freq; > + > + /* convert [0, 0xffff] -> [MAPPHONE_MAX_FREQ, MAPPHONE_MIN_FREQ] */ > + freq = 0xffff - level; > + freq *= MAPPHONE_MAX_FREQ - MAPPHONE_MIN_FREQ; > + freq /= 0xffff; > + freq += MAPPHONE_MIN_FREQ; > + > + state->period = DIV_ROUND_CLOSEST_ULL((u64) NSEC_PER_SEC * 10, freq); > + pwm_set_relative_duty_cycle(state, 50, 100); > +} > + > +static struct pwm_vibrator_hw pwm_vib_hw_mapphone = { > + .setup_pwm = pwm_vibrator_setup_mapphone, > + .setup_pwm_dir = pwm_vibrator_setup_mapphone, > +}; > + > +static int pwm_vibrator_start(struct pwm_vibrator *vibrator) > +{ > + struct device *pdev = vibrator->input->dev.parent; > + struct pwm_state state; > + int err; > + > + dev_dbg(pdev, "start vibrator with level=0x%04x", vibrator->level); > + > + err = regulator_enable(vibrator->vcc); > + if (err) { > + dev_err(pdev, "failed to enable regulator: %d", err); > + return err; > + } > + > + pwm_get_state(vibrator->pwm, &state); > + state.enabled = true; > + > + vibrator->hw->setup_pwm(vibrator->level, &state); > + dev_dbg(pdev, "period=%u", state.period); > + > + err = pwm_apply_state(vibrator->pwm, &state); > + if (err) { > + dev_err(pdev, "failed to apply pwm state: %d", err); > + return err; > + } > + > + if (vibrator->pwm_dir) { > + pwm_get_state(vibrator->pwm_dir, &state); > + state.enabled = true; > + > + /* always control via period */ > + vibrator->hw->setup_pwm_dir(vibrator->level, &state); > + > + err = pwm_apply_state(vibrator->pwm_dir, &state); > + if (err) { > + dev_err(pdev, "failed to apply dir-pwm state: %d", err); > + pwm_disable(vibrator->pwm); > + return err; > + } > + } > + > + return 0; > +} > + > +static void pwm_vibrator_stop(struct pwm_vibrator *vibrator) > +{ > + struct device *pdev = vibrator->input->dev.parent; > + > + dev_dbg(pdev, "stop vibrator"); > + > + regulator_disable(vibrator->vcc); > + > + if (vibrator->pwm_dir) > + pwm_disable(vibrator->pwm_dir); > + pwm_disable(vibrator->pwm); > +} > + > +static void vibra_play_work(struct work_struct *work) > +{ > + struct pwm_vibrator *vibrator = container_of(work, > + struct pwm_vibrator, play_work); > + > + if (vibrator->level) > + pwm_vibrator_start(vibrator); > + else > + pwm_vibrator_stop(vibrator); > +} > + > +static int pwm_vibrator_play_effect(struct input_dev *dev, void *data, > + struct ff_effect *effect) > +{ > + struct pwm_vibrator *vibrator = input_get_drvdata(dev); > + > + vibrator->level = effect->u.rumble.strong_magnitude; > + if (!vibrator->level) > + vibrator->level = effect->u.rumble.weak_magnitude; > + > + schedule_work(&vibrator->play_work); > + > + return 0; > +} > + > +static int pwm_vibrator_probe(struct platform_device *pdev) > +{ > + struct pwm_vibrator *vibrator; > + struct input_dev *input; > + struct pwm_state state; > + int err; > + > + vibrator = devm_kzalloc(&pdev->dev, sizeof(*vibrator), GFP_KERNEL); > + if (!vibrator) > + return -ENOMEM; > + > + input = devm_input_allocate_device(&pdev->dev); > + if (!vibrator || !input) No need to check "!vibrator" here. > + return -ENOMEM; > + > + vibrator->input = input; > + > + vibrator->vcc = devm_regulator_get(&pdev->dev, "vcc"); > + err = PTR_ERR_OR_ZERO(vibrator->vcc); > + if (err) { > + if (err != -EPROBE_DEFER) > + dev_err(&pdev->dev, "Failed to request regulator: %d", > + err); > + return err; > + } > + > + vibrator->pwm = devm_pwm_get(&pdev->dev, "enable"); > + err = PTR_ERR_OR_ZERO(vibrator->pwm); > + if (err) { > + if (err != -EPROBE_DEFER) > + dev_err(&pdev->dev, "Failed to request main pwm: %d", > + err); > + return err; > + } > + > + INIT_WORK(&vibrator->play_work, vibra_play_work); > + > + /* Sync up PWM state and ensure it is off. */ > + pwm_init_state(vibrator->pwm, &state); > + state.enabled = false; > + err = pwm_apply_state(vibrator->pwm, &state); > + if (err) { > + dev_err(&pdev->dev, "failed to apply initial PWM state: %d", > + err); > + return err; > + } > + > + vibrator->pwm_dir = devm_pwm_get(&pdev->dev, "direction"); > + err = PTR_ERR_OR_ZERO(vibrator->pwm_dir); > + if (err == -ENODATA) { > + vibrator->pwm_dir = NULL; > + } else if (err == -EPROBE_DEFER) { > + return err; > + } else if (err) { > + dev_err(&pdev->dev, "Failed to request direction pwm: %d", err); > + return err; > + } else { > + /* Sync up PWM state and ensure it is off. */ > + pwm_init_state(vibrator->pwm_dir, &state); > + state.enabled = false; > + err = pwm_apply_state(vibrator->pwm_dir, &state); > + if (err) { > + dev_err(&pdev->dev, "failed to apply initial PWM state: %d", > + err); > + return err; > + } > + } > + > + vibrator->hw = of_device_get_match_data(&pdev->dev); > + if (!vibrator->hw) > + vibrator->hw = &pwm_vib_hw_generic; > + > + input->name = "pwm-vibrator"; > + input->id.bustype = BUS_HOST; > + input->dev.parent = &pdev->dev; > + > + input_set_drvdata(input, vibrator); > + input_set_capability(input, EV_FF, FF_RUMBLE); > + > + err = input_ff_create_memless(input, NULL, pwm_vibrator_play_effect); > + if (err) { > + dev_err(&pdev->dev, "Couldn't create FF dev: %d", err); > + return err; > + } > + > + err = input_register_device(input); > + if (err) { > + dev_err(&pdev->dev, "Couldn't register input dev: %d", err); > + return err; > + } > + > + platform_set_drvdata(pdev, vibrator); > + > + dev_info(&pdev->dev, "pwm-vibrator probed."); Please drop, our boot is noisy enough and you should get message from input core when you register device. > + > + return 0; > +} > + > +static int pwm_vibrator_remove(struct platform_device *pdev) > +{ > + struct pwm_vibrator *vibrator = platform_get_drvdata(pdev); > + > + cancel_work_sync(&vibrator->play_work); > + pwm_vibrator_stop(vibrator); Maybe put it into input->stop() method? > + > + return 0; > +} > + > +#ifdef CONFIG_PM_SLEEP > +static int pwm_vibrator_suspend(struct device *dev) __maybe_unused. > +{ > + struct platform_device *pdev = to_platform_device(dev); > + struct pwm_vibrator *vibrator = platform_get_drvdata(pdev); > + struct input_dev *input = vibrator->input; > + unsigned long flags; > + > + spin_lock_irqsave(&input->event_lock, flags); > + if (vibrator->level) > + pwm_vibrator_stop(vibrator); What about work that might be running? > + spin_unlock_irqrestore(&input->event_lock, flags); > + > + return 0; > +} > + > +static int pwm_vibrator_resume(struct device *dev) __maybe_unused. > +{ > + struct platform_device *pdev = to_platform_device(dev); > + struct pwm_vibrator *vibrator = platform_get_drvdata(pdev); > + struct input_dev *input = vibrator->input; > + unsigned long flags; > + > + spin_lock_irqsave(&input->event_lock, flags); > + if (vibrator->level) > + pwm_vibrator_start(vibrator); > + spin_unlock_irqrestore(&input->event_lock, flags); > + > + return 0; > +} > +#endif > + > +static SIMPLE_DEV_PM_OPS(pwm_vibrator_pm_ops, > + pwm_vibrator_suspend, pwm_vibrator_resume); > + > +#ifdef CONFIG_OF > + > +#define PWM_VIB_COMPAT(of_compatible, cfg) { \ > + .compatible = of_compatible, \ > + .data = &cfg, \ > +} > + > +static const struct of_device_id pwm_vibra_dt_match_table[] = { > + PWM_VIB_COMPAT("pwm-vibrator", pwm_vib_hw_generic), > + PWM_VIB_COMPAT("motorola,mapphone-pwm-vibrator", pwm_vib_hw_mapphone), > + {}, > +}; > +MODULE_DEVICE_TABLE(of, pwm_vibra_dt_match_table); > +#endif > + > +static struct platform_driver pwm_vibrator_driver = { > + .probe = pwm_vibrator_probe, > + .remove = pwm_vibrator_remove, > + .driver = { > + .name = "pwm-vibrator", > + .pm = &pwm_vibrator_pm_ops, > + .of_match_table = of_match_ptr(pwm_vibra_dt_match_table), > + }, > +}; > +module_platform_driver(pwm_vibrator_driver); > + > +MODULE_AUTHOR("Sebastian Reichel <sre@kernel.org>"); > +MODULE_DESCRIPTION("PWM vibrator driver"); > +MODULE_LICENSE("GPL"); > +MODULE_ALIAS("platform:pwm-vibrator"); > -- > 2.11.0 > Thanks.
diff --git a/Documentation/devicetree/bindings/input/pwm-vibrator.txt b/Documentation/devicetree/bindings/input/pwm-vibrator.txt new file mode 100644 index 000000000000..c35be4691366 --- /dev/null +++ b/Documentation/devicetree/bindings/input/pwm-vibrator.txt @@ -0,0 +1,60 @@ +* PWM vibrator device tree bindings + +Registers a PWM device as vibrator. + +Required properties: +- compatible: should be + * "pwm-vibrator" + For vibrators controlled using the PWM channel's duty cycle (higher duty means + the vibrator becomes stronger). + * "motorola,mapphone-pwm-vibrator" + For vibrator found in Motorola Droid 4. This vibrator generates a pulse for + every rising edge, so its controlled using a duty cycle of 50% and changing + the period time. +- pwm-names: Should contain "enable" and optionally "direction" +- pwms: Should contain a PWM handle for each entry in pwm-names + +Example from Motorola Droid 4: + +&omap4_pmx_core { + vibrator_direction_pin: pinmux_vibrator_direction_pin { + pinctrl-single,pins = < + OMAP4_IOPAD(0x1ce, PIN_OUTPUT | MUX_MODE1) /* dmtimer8_pwm_evt (gpio_27) */ + >; + }; + + vibrator_enable_pin: pinmux_vibrator_enable_pin { + pinctrl-single,pins = < + OMAP4_IOPAD(0X1d0, PIN_OUTPUT | MUX_MODE1) /* dmtimer9_pwm_evt (gpio_28) */ + >; + }; +}; + +/ { + pwm8: dmtimer-pwm { + pinctrl-names = "default"; + pinctrl-0 = <&vibrator_direction_pin>; + + compatible = "ti,omap-dmtimer-pwm"; + #pwm-cells = <3>; + ti,timers = <&timer8>; + ti,clock-source = <0x01>; + }; + + pwm9: dmtimer-pwm { + pinctrl-names = "default"; + pinctrl-0 = <&vibrator_enable_pin>; + + compatible = "ti,omap-dmtimer-pwm"; + #pwm-cells = <3>; + ti,timers = <&timer9>; + ti,clock-source = <0x01>; + }; + + vibrator { + compatible = "pwm-vibrator"; + pwms = <&pwm8 0 1000000000 0>, + <&pwm9 0 1000000000 0>; + pwm-names = "enable", "direction"; + }; +}; diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig index 5b6c52210d20..d8e0b25eb217 100644 --- a/drivers/input/misc/Kconfig +++ b/drivers/input/misc/Kconfig @@ -571,6 +571,17 @@ config INPUT_PWM_BEEPER To compile this driver as a module, choose M here: the module will be called pwm-beeper. +config INPUT_PWM_VIBRA + tristate "PWM vibrator support" + depends on PWM + help + Say Y here to get support for PWM based vibrator devices. + + If unsure, say N. + + To compile this driver as a module, choose M here: the module will be + called pwm-vibra. + config INPUT_GPIO_ROTARY_ENCODER tristate "Rotary encoders connected to GPIO pins" depends on GPIOLIB || COMPILE_TEST diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile index b10523f2878e..9a6517f5458c 100644 --- a/drivers/input/misc/Makefile +++ b/drivers/input/misc/Makefile @@ -58,6 +58,7 @@ obj-$(CONFIG_INPUT_PM8XXX_VIBRATOR) += pm8xxx-vibrator.o obj-$(CONFIG_INPUT_PMIC8XXX_PWRKEY) += pmic8xxx-pwrkey.o obj-$(CONFIG_INPUT_POWERMATE) += powermate.o obj-$(CONFIG_INPUT_PWM_BEEPER) += pwm-beeper.o +obj-$(CONFIG_INPUT_PWM_VIBRA) += pwm-vibra.o obj-$(CONFIG_INPUT_RB532_BUTTON) += rb532_button.o obj-$(CONFIG_INPUT_REGULATOR_HAPTIC) += regulator-haptic.o obj-$(CONFIG_INPUT_RETU_PWRBUTTON) += retu-pwrbutton.o diff --git a/drivers/input/misc/pwm-vibra.c b/drivers/input/misc/pwm-vibra.c new file mode 100644 index 000000000000..a7d36d88679a --- /dev/null +++ b/drivers/input/misc/pwm-vibra.c @@ -0,0 +1,348 @@ +/* + * PWM vibrator driver + * + * Copyright (C) 2017 Collabora Ltd. + * + * Based on previous work from: + * Copyright (C) 2012 Dmitry Torokhov <dmitry.torokhov@gmail.com> + * + * Based on PWM beeper driver: + * Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de> + * + * 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. + */ + +#define DEBUG + +#include <linux/input.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of_device.h> +#include <linux/platform_device.h> +#include <linux/pwm.h> +#include <linux/regulator/consumer.h> +#include <linux/slab.h> + +/** + * Motorola Droid 4 (also known as mapphone), has a vibrator, which pulses + * 1x on rising edge. Increasing the pwm period results in more pulses per + * second, but reduces intensity. There is also a second channel to control + * the vibrator's rotation direction to increase effect. The following + * numbers were determined manually. Going below 12.5 Hz means, clearly + * noticeable pauses and at 30 Hz the vibration is just barely noticable + * anymore. + */ +#define MAPPHONE_MIN_FREQ 125 /* 12.5 Hz */ +#define MAPPHONE_MAX_FREQ 300 /* 30.0 Hz */ + +struct pwm_vibrator_hw { + void (*setup_pwm)(u16 level, struct pwm_state *); + void (*setup_pwm_dir)(u16 level, struct pwm_state *); +}; + +struct pwm_vibrator { + struct input_dev *input; + struct pwm_device *pwm; + struct pwm_device *pwm_dir; + struct regulator *vcc; + + struct work_struct play_work; + u16 level; + + const struct pwm_vibrator_hw *hw; +}; + +static void pwm_vibrator_setup_generic(u16 level, struct pwm_state *state) +{ + /* period is configured by platform, duty cycle controls strength */ + pwm_set_relative_duty_cycle(state, level, 0xffff); +} + +static void pwm_vibrator_setup_dir_generic(u16 level, struct pwm_state *state) +{ + /* period is configured by platform, duty cycle controls strength */ + pwm_set_relative_duty_cycle(state, 50, 100); +} + +static struct pwm_vibrator_hw pwm_vib_hw_generic = { + .setup_pwm = pwm_vibrator_setup_generic, + .setup_pwm_dir = pwm_vibrator_setup_dir_generic, +}; + +static void pwm_vibrator_setup_mapphone(u16 level, struct pwm_state *state) +{ + unsigned int freq; + + /* convert [0, 0xffff] -> [MAPPHONE_MAX_FREQ, MAPPHONE_MIN_FREQ] */ + freq = 0xffff - level; + freq *= MAPPHONE_MAX_FREQ - MAPPHONE_MIN_FREQ; + freq /= 0xffff; + freq += MAPPHONE_MIN_FREQ; + + state->period = DIV_ROUND_CLOSEST_ULL((u64) NSEC_PER_SEC * 10, freq); + pwm_set_relative_duty_cycle(state, 50, 100); +} + +static struct pwm_vibrator_hw pwm_vib_hw_mapphone = { + .setup_pwm = pwm_vibrator_setup_mapphone, + .setup_pwm_dir = pwm_vibrator_setup_mapphone, +}; + +static int pwm_vibrator_start(struct pwm_vibrator *vibrator) +{ + struct device *pdev = vibrator->input->dev.parent; + struct pwm_state state; + int err; + + dev_dbg(pdev, "start vibrator with level=0x%04x", vibrator->level); + + err = regulator_enable(vibrator->vcc); + if (err) { + dev_err(pdev, "failed to enable regulator: %d", err); + return err; + } + + pwm_get_state(vibrator->pwm, &state); + state.enabled = true; + + vibrator->hw->setup_pwm(vibrator->level, &state); + dev_dbg(pdev, "period=%u", state.period); + + err = pwm_apply_state(vibrator->pwm, &state); + if (err) { + dev_err(pdev, "failed to apply pwm state: %d", err); + return err; + } + + if (vibrator->pwm_dir) { + pwm_get_state(vibrator->pwm_dir, &state); + state.enabled = true; + + /* always control via period */ + vibrator->hw->setup_pwm_dir(vibrator->level, &state); + + err = pwm_apply_state(vibrator->pwm_dir, &state); + if (err) { + dev_err(pdev, "failed to apply dir-pwm state: %d", err); + pwm_disable(vibrator->pwm); + return err; + } + } + + return 0; +} + +static void pwm_vibrator_stop(struct pwm_vibrator *vibrator) +{ + struct device *pdev = vibrator->input->dev.parent; + + dev_dbg(pdev, "stop vibrator"); + + regulator_disable(vibrator->vcc); + + if (vibrator->pwm_dir) + pwm_disable(vibrator->pwm_dir); + pwm_disable(vibrator->pwm); +} + +static void vibra_play_work(struct work_struct *work) +{ + struct pwm_vibrator *vibrator = container_of(work, + struct pwm_vibrator, play_work); + + if (vibrator->level) + pwm_vibrator_start(vibrator); + else + pwm_vibrator_stop(vibrator); +} + +static int pwm_vibrator_play_effect(struct input_dev *dev, void *data, + struct ff_effect *effect) +{ + struct pwm_vibrator *vibrator = input_get_drvdata(dev); + + vibrator->level = effect->u.rumble.strong_magnitude; + if (!vibrator->level) + vibrator->level = effect->u.rumble.weak_magnitude; + + schedule_work(&vibrator->play_work); + + return 0; +} + +static int pwm_vibrator_probe(struct platform_device *pdev) +{ + struct pwm_vibrator *vibrator; + struct input_dev *input; + struct pwm_state state; + int err; + + vibrator = devm_kzalloc(&pdev->dev, sizeof(*vibrator), GFP_KERNEL); + if (!vibrator) + return -ENOMEM; + + input = devm_input_allocate_device(&pdev->dev); + if (!vibrator || !input) + return -ENOMEM; + + vibrator->input = input; + + vibrator->vcc = devm_regulator_get(&pdev->dev, "vcc"); + err = PTR_ERR_OR_ZERO(vibrator->vcc); + if (err) { + if (err != -EPROBE_DEFER) + dev_err(&pdev->dev, "Failed to request regulator: %d", + err); + return err; + } + + vibrator->pwm = devm_pwm_get(&pdev->dev, "enable"); + err = PTR_ERR_OR_ZERO(vibrator->pwm); + if (err) { + if (err != -EPROBE_DEFER) + dev_err(&pdev->dev, "Failed to request main pwm: %d", + err); + return err; + } + + INIT_WORK(&vibrator->play_work, vibra_play_work); + + /* Sync up PWM state and ensure it is off. */ + pwm_init_state(vibrator->pwm, &state); + state.enabled = false; + err = pwm_apply_state(vibrator->pwm, &state); + if (err) { + dev_err(&pdev->dev, "failed to apply initial PWM state: %d", + err); + return err; + } + + vibrator->pwm_dir = devm_pwm_get(&pdev->dev, "direction"); + err = PTR_ERR_OR_ZERO(vibrator->pwm_dir); + if (err == -ENODATA) { + vibrator->pwm_dir = NULL; + } else if (err == -EPROBE_DEFER) { + return err; + } else if (err) { + dev_err(&pdev->dev, "Failed to request direction pwm: %d", err); + return err; + } else { + /* Sync up PWM state and ensure it is off. */ + pwm_init_state(vibrator->pwm_dir, &state); + state.enabled = false; + err = pwm_apply_state(vibrator->pwm_dir, &state); + if (err) { + dev_err(&pdev->dev, "failed to apply initial PWM state: %d", + err); + return err; + } + } + + vibrator->hw = of_device_get_match_data(&pdev->dev); + if (!vibrator->hw) + vibrator->hw = &pwm_vib_hw_generic; + + input->name = "pwm-vibrator"; + input->id.bustype = BUS_HOST; + input->dev.parent = &pdev->dev; + + input_set_drvdata(input, vibrator); + input_set_capability(input, EV_FF, FF_RUMBLE); + + err = input_ff_create_memless(input, NULL, pwm_vibrator_play_effect); + if (err) { + dev_err(&pdev->dev, "Couldn't create FF dev: %d", err); + return err; + } + + err = input_register_device(input); + if (err) { + dev_err(&pdev->dev, "Couldn't register input dev: %d", err); + return err; + } + + platform_set_drvdata(pdev, vibrator); + + dev_info(&pdev->dev, "pwm-vibrator probed."); + + return 0; +} + +static int pwm_vibrator_remove(struct platform_device *pdev) +{ + struct pwm_vibrator *vibrator = platform_get_drvdata(pdev); + + cancel_work_sync(&vibrator->play_work); + pwm_vibrator_stop(vibrator); + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int pwm_vibrator_suspend(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct pwm_vibrator *vibrator = platform_get_drvdata(pdev); + struct input_dev *input = vibrator->input; + unsigned long flags; + + spin_lock_irqsave(&input->event_lock, flags); + if (vibrator->level) + pwm_vibrator_stop(vibrator); + spin_unlock_irqrestore(&input->event_lock, flags); + + return 0; +} + +static int pwm_vibrator_resume(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct pwm_vibrator *vibrator = platform_get_drvdata(pdev); + struct input_dev *input = vibrator->input; + unsigned long flags; + + spin_lock_irqsave(&input->event_lock, flags); + if (vibrator->level) + pwm_vibrator_start(vibrator); + spin_unlock_irqrestore(&input->event_lock, flags); + + return 0; +} +#endif + +static SIMPLE_DEV_PM_OPS(pwm_vibrator_pm_ops, + pwm_vibrator_suspend, pwm_vibrator_resume); + +#ifdef CONFIG_OF + +#define PWM_VIB_COMPAT(of_compatible, cfg) { \ + .compatible = of_compatible, \ + .data = &cfg, \ +} + +static const struct of_device_id pwm_vibra_dt_match_table[] = { + PWM_VIB_COMPAT("pwm-vibrator", pwm_vib_hw_generic), + PWM_VIB_COMPAT("motorola,mapphone-pwm-vibrator", pwm_vib_hw_mapphone), + {}, +}; +MODULE_DEVICE_TABLE(of, pwm_vibra_dt_match_table); +#endif + +static struct platform_driver pwm_vibrator_driver = { + .probe = pwm_vibrator_probe, + .remove = pwm_vibrator_remove, + .driver = { + .name = "pwm-vibrator", + .pm = &pwm_vibrator_pm_ops, + .of_match_table = of_match_ptr(pwm_vibra_dt_match_table), + }, +}; +module_platform_driver(pwm_vibrator_driver); + +MODULE_AUTHOR("Sebastian Reichel <sre@kernel.org>"); +MODULE_DESCRIPTION("PWM vibrator driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:pwm-vibrator");
Provide a simple driver for PWM controllable vibrators. It will be used by Motorola Droid 4. Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk> --- .../devicetree/bindings/input/pwm-vibrator.txt | 60 ++++ drivers/input/misc/Kconfig | 11 + drivers/input/misc/Makefile | 1 + drivers/input/misc/pwm-vibra.c | 348 +++++++++++++++++++++ 4 files changed, 420 insertions(+) create mode 100644 Documentation/devicetree/bindings/input/pwm-vibrator.txt create mode 100644 drivers/input/misc/pwm-vibra.c