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Date: Mon, 17 Oct 2022 13:27:36 +0200
From: konrad.dybcio@...ainline.org
To: Caleb Connolly <caleb@...nolly.tech>
Cc: krzysztof.kozlowski@...aro.org, phone-devel@...r.kernel.org,
~postmarketos/upstreaming@...ts.sr.ht,
Andy Gross <agross@...nel.org>,
Bjorn Andersson <andersson@...nel.org>,
devicetree@...r.kernel.org,
Dmitry Torokhov <dmitry.torokhov@...il.com>,
Jeff LaBundy <jeff@...undy.com>,
Konrad Dybcio <konrad.dybcio@...ainline.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
linux-arm-msm@...r.kernel.org, linux-input@...r.kernel.org,
linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
Nathan Chancellor <nathan@...nel.org>,
Nick Desaulniers <ndesaulniers@...gle.com>,
Rob Herring <robh+dt@...nel.org>, Tom Rix <trix@...hat.com>
Subject: Re: [PATCH v7 2/2] input: add Qualcomm SPMI haptics driver
On 2022-10-15 19:30, Caleb Connolly wrote:
> Add support for the haptics found in pmi8998 and related PMICs.
> Based on the ff-memless interface. Currently this driver provides
> a partial implementation of hardware features.
>
> This driver only supports LRAs (Linear Resonant Actuators) in the
> "buffer"
> mode with a single wave pattern.
>
> Signed-off-by: Caleb Connolly <caleb@...nolly.tech>
> ---
> drivers/input/misc/Kconfig | 15 +
> drivers/input/misc/Makefile | 1 +
> drivers/input/misc/qcom-pmi8998-haptics.c | 690 ++++++++++++++++++++++
> 3 files changed, 706 insertions(+)
> create mode 100644 drivers/input/misc/qcom-pmi8998-haptics.c
>
> diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
> index a18ab7358d8f..608a64fa7914 100644
> --- a/drivers/input/misc/Kconfig
> +++ b/drivers/input/misc/Kconfig
> @@ -186,6 +186,21 @@ config INPUT_PMIC8XXX_PWRKEY
> To compile this driver as a module, choose M here: the
> module will be called pmic8xxx-pwrkey.
>
> +config INPUT_QCOM_PMI8998_HAPTICS
> + tristate "Qualcomm SPMI HAPTICS"
> + depends on ARCH_QCOM || COMPILE_TEST
> + depends on MFD_PM8XXX || MFD_SPMI_PMIC || COMPILE_TEST
> + select INPUT_FF_MEMLESS
> + help
> + This option enables support for the haptics found in pmi8998 and
> + related PMICs. Based on the ff-memless interface.
> +
> + This driver is for hardware too new for the INPUT_PM8XXX_VIBRATOR
> + driver.
> +
> + To compile this driver as module, choose M here: the
> + module will be called qcom_pmi8998_haptics.
> +
> config INPUT_SPARCSPKR
> tristate "SPARC Speaker support"
> depends on PCI && SPARC64
> diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
> index 28dfc444f0a9..039d0a97f2f4 100644
> --- a/drivers/input/misc/Makefile
> +++ b/drivers/input/misc/Makefile
> @@ -65,6 +65,7 @@ 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-$(CONFIG_INPUT_QCOM_PMI8998_HAPTICS)+= qcom-pmi8998-haptics.o
> obj-$(CONFIG_INPUT_RAVE_SP_PWRBUTTON) += rave-sp-pwrbutton.o
> obj-$(CONFIG_INPUT_RB532_BUTTON) += rb532_button.o
> obj-$(CONFIG_INPUT_REGULATOR_HAPTIC) += regulator-haptic.o
> diff --git a/drivers/input/misc/qcom-pmi8998-haptics.c
> b/drivers/input/misc/qcom-pmi8998-haptics.c
> new file mode 100644
> index 000000000000..e9eec2d9de2d
> --- /dev/null
> +++ b/drivers/input/misc/qcom-pmi8998-haptics.c
> @@ -0,0 +1,690 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Copyright (c) 2022, Caleb Connolly <caleb@...nolly.tech>
> + * Qualcomm QPMI haptics driver for pmi8998 and related PMICs.
Did they actually call it QPMI or was it supposed to be SPMI?
> + */
> +
> +#include <linux/bits.h>
> +#include <linux/bitfield.h>
> +#include <linux/errno.h>
> +#include <linux/input.h>
> +#include <linux/interrupt.h>
> +#include <linux/kernel.h>
> +#include <linux/log2.h>
> +#include <linux/minmax.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +#include <linux/time.h>
> +#include <linux/types.h>
> +
> +// clang-format off
Not sure if that was meant to be here?
> +#define HAP_STATUS_1_REG 0x0A
> +#define HAP_BUSY_BIT BIT(1)
> +#define SC_FLAG_BIT BIT(3)
> +#define AUTO_RES_ERROR_BIT BIT(4)
> +
> +#define HAP_LRA_AUTO_RES_LO_REG 0x0B
> +#define HAP_LRA_AUTO_RES_HI_REG 0x0C
> +
> +#define HAP_EN_CTL_REG 0x46
> +#define HAP_EN_BIT BIT(7)
> +
> +#define HAP_EN_CTL2_REG 0x48
> +#define BRAKE_EN_BIT BIT(0)
> +
> +#define HAP_AUTO_RES_CTRL_REG 0x4B
> +#define AUTO_RES_EN_BIT BIT(7)
> +#define AUTO_RES_ERR_RECOVERY_BIT BIT(3)
> +#define AUTO_RES_EN_FLAG_BIT BIT(0)
> +
> +#define HAP_CFG1_REG 0x4C
> +#define HAP_ACT_TYPE_MASK BIT(0)
> +
> +#define HAP_CFG2_REG 0x4D
> +#define HAP_LRA_RES_TYPE_MASK BIT(0)
> +
> +#define HAP_SEL_REG 0x4E
> +#define HAP_WF_SOURCE_MASK GENMASK(5, 4)
> +#define HAP_WF_SOURCE_SHIFT 4
> +
> +#define HAP_LRA_AUTO_RES_REG 0x4F
> +#define LRA_AUTO_RES_MODE_MASK GENMASK(6, 4)
> +#define LRA_AUTO_RES_MODE_SHIFT 4
> +#define LRA_HIGH_Z_MASK GENMASK(3, 2)
> +#define LRA_HIGH_Z_SHIFT 2
> +#define LRA_RES_CAL_MASK GENMASK(1, 0)
> +#define HAP_RES_CAL_PERIOD_MIN 4
> +#define HAP_RES_CAL_PERIOD_MAX 32
> +
> +#define HAP_VMAX_CFG_REG 0x51
> +#define HAP_VMAX_OVD_BIT BIT(6)
> +#define HAP_VMAX_MASK GENMASK(5, 1)
> +#define HAP_VMAX_SHIFT 1
> +
> +#define HAP_ILIM_CFG_REG 0x52
> +#define HAP_ILIM_SEL_MASK BIT(0)
> +#define HAP_ILIM_400_MA 0
> +#define HAP_ILIM_800_MA 1
> +
> +#define HAP_SC_DEB_REG 0x53
> +#define HAP_SC_DEB_MASK GENMASK(2, 0)
> +#define HAP_SC_DEB_CYCLES_MIN 0
> +#define HAP_DEF_SC_DEB_CYCLES 8
> +#define HAP_SC_DEB_CYCLES_MAX 32
> +
> +#define HAP_RATE_CFG1_REG 0x54
> +#define HAP_RATE_CFG1_MASK GENMASK(7, 0)
> +#define HAP_RATE_CFG2_SHIFT 8 // As CFG2 is the most significant byte
Unless something changed, all comments should be /* C-style */
[...]
> + /*
> + * Configure RATE_CFG1 and RATE_CFG2 registers.
> + * Note: For ERM (unsupported) these registers act as play rate and
> + * for LRA these represent resonance period
> + */
> + play_rate = haptics->play_wave_rate / HAP_RATE_CFG_STEP_US;
> + val = FIELD_PREP(HAP_RATE_CFG1_MASK, play_rate);
> + ret = regmap_update_bits(haptics->regmap,
> + haptics->base + HAP_RATE_CFG1_REG,
> + HAP_RATE_CFG1_MASK, val);
> + val = FIELD_PREP(HAP_RATE_CFG2_MASK, play_rate >> 8);
> + ret = ret ?:
IMO the ternary operator here is really forced.. maybe an 'if' would be
more readable
> + regmap_update_bits(haptics->regmap,
> + haptics->base + HAP_RATE_CFG2_REG,
> + HAP_RATE_CFG1_MASK, val);
> + if (ret)
> + return ret;
> +
> + ret = haptics_write_brake_pattern(haptics, default_brake_pattern);
> + if (ret)
> + return ret;
> +
> + /* Currently this is the only supported play mode */
> + if (haptics->play_mode == HAP_PLAY_BUFFER) {
> + /* zero repeats and zero sample repeats */
> + val = FIELD_PREP(WF_REPEAT_MASK, 0) |
> + FIELD_PREP(WF_S_REPEAT_MASK, 0);
> + ret = regmap_update_bits(haptics->regmap,
> + haptics->base + HAP_WF_REPEAT_REG,
> + WF_REPEAT_MASK | WF_S_REPEAT_MASK,
> + val);
> + if (ret)
> + return ret;
> +
> + ret = regmap_bulk_write(haptics->regmap,
> + haptics->base + HAP_WF_S1_REG,
> + wave_sample_pattern, HAP_WAVE_SAMP_LEN);
> + if (ret)
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static int spmi_haptics_probe(struct platform_device *pdev)
> +{
> + struct spmi_haptics *haptics;
> + struct input_dev *input_dev;
> + int ret, irq;
> +
> + haptics = devm_kzalloc(&pdev->dev, sizeof(*haptics), GFP_KERNEL);
> + if (!haptics)
> + return -ENOMEM;
> +
> + haptics->regmap = dev_get_regmap(pdev->dev.parent, NULL);
> + if (!haptics->regmap)
> + return -ENODEV;
> +
> + haptics->dev = &pdev->dev;
> +
> + platform_set_drvdata(pdev, haptics);
> +
> + ret = device_property_read_u32(haptics->dev, "reg", &haptics->base);
> + if (ret)
> + return dev_err_probe(haptics->dev, ret,
> + "Couldn't read base address");
> +
> + /* This is the only currently supported configuration, these values
/*
* This is..
> + * are left to allow future additions
> + */
> + haptics->actuator_type = HAP_TYPE_LRA;
> + haptics->play_mode = HAP_PLAY_BUFFER;
> + haptics->wave_shape = HAP_WAVE_SINE;
> + haptics->current_limit = HAP_ILIM_400_MA;
> +
> + ret = device_property_read_u32(haptics->dev,
> "qcom,wave-play-rate-us",
> + &haptics->play_wave_rate);
> + if (ret)
> + return dev_err_probe(haptics->dev, ret,
> + "qcom,wave-play-rate-us is required\n");
> +
> + INIT_WORK(&haptics->work, haptics_play_stop_work);
> +
> + ret = haptics_init(haptics);
> + if (ret)
> + return ret;
> +
> + input_dev = devm_input_allocate_device(&pdev->dev);
> + if (!input_dev)
> + return -ENOMEM;
> +
> + input_dev->name = "spmi_haptics";
> + input_dev->id.version = 1;
> + input_dev->close = spmi_haptics_close;
> + input_set_drvdata(input_dev, haptics);
> +
> + haptics->input = input_dev;
> +
> + /* In the future this should become FF_PERIODIC */
> + input_set_capability(haptics->input, EV_FF, FF_RUMBLE);
> +
> + ret = input_ff_create_memless(input_dev, NULL,
> + spmi_haptics_play_effect);
> + if (ret)
> + return dev_err_probe(
> + &pdev->dev, ret,
> + "Couldn't register haptics as EV_FF device\n");
> +
> + ret = input_register_device(input_dev);
> + if (ret)
> + return dev_err_probe(&pdev->dev, ret,
> + "Couldn't register input device\n");
> +
> + /* NOTE: the play IRQ is only used for buffer mode */
> + irq = platform_get_irq_byname(pdev, "play");
> + if (irq < 0) {
> + return dev_err_probe(&pdev->dev, irq,
> + "Unable to get play irq\n");
> + }
> + ret = devm_request_threaded_irq(haptics->dev, irq, NULL,
> + haptics_play_irq, IRQF_ONESHOT,
> + "haptics_play_irq", haptics);
> + if (ret)
> + return dev_err_probe(haptics->dev, ret,
> + "Couldn't request play irq\n");
> +
> + irq = platform_get_irq_byname(pdev, "short");
> + if (irq < 0)
> + return dev_err_probe(&pdev->dev, irq,
> + "Unable to get short circut irq\n");
typo: circuit
> + ret = devm_request_threaded_irq(haptics->dev, irq, NULL,
> haptics_sc_irq,
> + IRQF_ONESHOT, "haptics_short_irq",
> + haptics);
> + if (ret)
> + return dev_err_probe(haptics->dev, ret,
> + "Couldn't request short circuit irq\n");
> +
> + mutex_init(&haptics->play_lock);
> +
> + return 0;
> +}
> +
> +static int __maybe_unused spmi_haptics_suspend(struct device *dev)
> +{
> + struct spmi_haptics *haptics = dev_get_drvdata(dev);
> +
> + cancel_work_sync(&haptics->work);
> + haptics_stop_vibrate(haptics);
> +
> + return 0;
> +}
> +
> +static SIMPLE_DEV_PM_OPS(spmi_haptics_pm_ops, spmi_haptics_suspend,
> NULL);
> +
> +static int spmi_haptics_remove(struct platform_device *pdev)
> +{
> + struct spmi_haptics *haptics = dev_get_drvdata(&pdev->dev);
> +
> + cancel_work_sync(&haptics->work);
> + mutex_destroy(&haptics->play_lock);
> + input_unregister_device(haptics->input);
> +
> + return 0;
> +}
> +
> +static void spmi_haptics_shutdown(struct platform_device *pdev)
> +{
> + struct spmi_haptics *haptics = dev_get_drvdata(&pdev->dev);
> +
> + cancel_work_sync(&haptics->work);
> + haptics_stop_vibrate(haptics);
> +}
> +
> +static const struct of_device_id spmi_haptics_match_table[] = {
> + { .compatible = "qcom,pmi8998-haptics" },
> + {}
> +};
> +MODULE_DEVICE_TABLE(of, spmi_haptics_match_table);
> +
> +static struct platform_driver spmi_haptics_driver = {
I have mixed feelings about calling this "SPMI haptics" instead of
something like
"QCOM SPMI haptics" with SPMI being used on all kinds of platforms, but
ultimately
I don't think it's that much of an issue, the compatible says it all.
Konrad
> + .probe = spmi_haptics_probe,
> + .remove = spmi_haptics_remove,
> + .shutdown = spmi_haptics_shutdown,
> + .driver = {
> + .name = "spmi-haptics",
> + .pm = &spmi_haptics_pm_ops,
> + .of_match_table = spmi_haptics_match_table,
> + },
> +};
> +module_platform_driver(spmi_haptics_driver);
> +
> +MODULE_DESCRIPTION("spmi haptics driver using ff-memless framework");
> +MODULE_LICENSE("GPL");
> +MODULE_AUTHOR("Caleb Connolly <caleb@...nolly.tech>");
> --
> 2.38.0
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