[PATCH v5 4/5] Input: cs40l50 - Add support for the CS40L50 haptic driver

Introduce support for Cirrus Logic Device CS40L50: a haptic driver with waveform memory, integrated DSP, and closed-loop algorithms.

The input driver provides the interface for control of haptic effects through the device.

Signed-off-by: James Ogletree jogletre@opensource.cirrus.com --- MAINTAINERS | 1 + drivers/input/misc/Kconfig | 10 + drivers/input/misc/Makefile | 1 + drivers/input/misc/cs40l50-vibra.c | 572 +++++++++++++++++++++++++++++ 4 files changed, 584 insertions(+) create mode 100644 drivers/input/misc/cs40l50-vibra.c

diff --git a/MAINTAINERS b/MAINTAINERS index 69a9e0a3b968..24cfb4f017bb 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -4940,6 +4940,7 @@ M: Ben Bright ben.bright@cirrus.com L: patches@opensource.cirrus.com S: Supported F: Documentation/devicetree/bindings/input/cirrus,cs40l50.yaml +F: drivers/input/misc/cs40l* F: drivers/mfd/cs40l* F: include/linux/mfd/cs40l*

diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig index 6ba984d7f0b1..ee45dbb0636e 100644 --- a/drivers/input/misc/Kconfig +++ b/drivers/input/misc/Kconfig @@ -140,6 +140,16 @@ config INPUT_BMA150 To compile this driver as a module, choose M here: the module will be called bma150.

+config INPUT_CS40L50_VIBRA + tristate "CS40L50 Haptic Driver support" + depends on MFD_CS40L50_CORE + help + Say Y here to enable support for Cirrus Logic's CS40L50 + haptic driver. + + To compile this driver as a module, choose M here: the + module will be called cs40l50-vibra. + config INPUT_E3X0_BUTTON tristate "NI Ettus Research USRP E3xx Button support." default n diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile index 04296a4abe8e..88279de6d3d5 100644 --- a/drivers/input/misc/Makefile +++ b/drivers/input/misc/Makefile @@ -28,6 +28,7 @@ obj-$(CONFIG_INPUT_CMA3000) += cma3000_d0x.o obj-$(CONFIG_INPUT_CMA3000_I2C) += cma3000_d0x_i2c.o obj-$(CONFIG_INPUT_COBALT_BTNS) += cobalt_btns.o obj-$(CONFIG_INPUT_CPCAP_PWRBUTTON) += cpcap-pwrbutton.o +obj-$(CONFIG_INPUT_CS40L50_VIBRA) += cs40l50-vibra.o obj-$(CONFIG_INPUT_DA7280_HAPTICS) += da7280.o obj-$(CONFIG_INPUT_DA9052_ONKEY) += da9052_onkey.o obj-$(CONFIG_INPUT_DA9055_ONKEY) += da9055_onkey.o diff --git a/drivers/input/misc/cs40l50-vibra.c b/drivers/input/misc/cs40l50-vibra.c new file mode 100644 index 000000000000..cd3c2bf132da --- /dev/null +++ b/drivers/input/misc/cs40l50-vibra.c @@ -0,0 +1,572 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * CS40L50 Advanced Haptic Driver with waveform memory, + * integrated DSP, and closed-loop algorithms + * + * Copyright 2023 Cirrus Logic, Inc. + * + * Author: James Ogletree james.ogletree@cirrus.com + */ + +#include <linux/input.h> +#include <linux/mfd/cs40l50.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> + +/* Wavetables */ +#define CS40L50_RAM_INDEX_START 0x1000000 +#define CS40L50_RAM_INDEX_END 0x100007F +#define CS40L50_RTH_INDEX_START 0x1400000 +#define CS40L50_RTH_INDEX_END 0x1400001 +#define CS40L50_ROM_INDEX_START 0x1800000 +#define CS40L50_ROM_INDEX_END 0x180001A +#define CS40L50_OWT_HEADER_SIZE 12 +#define CS40L50_OWT_TYPE_PCM 8 +#define CS40L50_OWT_TYPE_PWLE 12 +#define CS40L50_OWT_PCM_ID 0x0 +#define CS40L50_OWT_CUSTOM_DATA_SIZE 2 + +/* DSP */ +#define CS40L50_GPIO_BASE 0x2804140 +#define CS40L50_OWT_BASE 0x2805C34 +#define CS40L50_OWT_SIZE 0x2805C38 +#define CS40L50_OWT_NEXT 0x2805C3C + +/* GPIO */ +#define CS40L50_GPIO_NUM_MASK GENMASK(14, 12) +#define CS40L50_GPIO_EDGE_MASK BIT(15) +#define CS40L50_GPIO_MAPPING_INVALID 0 +#define CS40L50_GPIO_DISABLE 0x1FF + +enum vibra_bank_type { + WVFRM_BANK_RAM, + WVFRM_BANK_ROM, + WVFRM_BANK_OWT, + WVFRM_BANK_NUM, +}; + +/* Describes an area in DSP memory populated by effects */ +struct vibra_bank { + enum vibra_bank_type bank; + u32 base_index; + u32 max_index; +}; + +struct vibra_effect { + enum vibra_bank_type bank; + struct list_head list; + u32 gpio_mapping; + u32 index; + int id; +}; + +/* Describes haptic interface of loaded DSP firmware */ +struct vibra_dsp { + struct vibra_bank *banks; + u32 gpio_base_reg; + u32 owt_offset_reg; + u32 owt_size_reg; + u32 owt_base_reg; + u32 mailbox_reg; + u32 push_owt_cmd; + u32 delete_owt_cmd; + u32 stop_cmd; +}; + +/* Describes configuration and state of haptic operations */ +struct vibra_info { + struct device *dev; + struct regmap *regmap; + struct input_dev *input; + struct mutex lock; + struct workqueue_struct *vibe_wq; + struct work_struct vibe_start_work; + struct work_struct vibe_stop_work; + struct work_struct erase_work; + struct work_struct add_work; + struct ff_effect *start_effect; + struct ff_effect *erase_effect; + struct ff_effect add_effect; + struct list_head effect_head; + struct vibra_dsp dsp; + int erase_error; + int add_error; +}; + +static struct vibra_effect *vibra_find_effect(int id, struct list_head *effect_head) +{ + struct vibra_effect *effect; + + list_for_each_entry(effect, effect_head, list) + if (effect->id == id) + return effect; + + return NULL; +} + +static int vibra_effect_bank_set(struct vibra_info *info, + struct vibra_effect *effect, + struct ff_periodic_effect add_effect) +{ + s16 bank = add_effect.custom_data[0] & 0xffffu; + unsigned int len = add_effect.custom_len; + + if (bank >= WVFRM_BANK_NUM) { + dev_err(info->dev, "Invalid waveform bank: %d\n", bank); + return -EINVAL; + } + + effect->bank = len > CS40L50_OWT_CUSTOM_DATA_SIZE ? WVFRM_BANK_OWT : bank; + + return 0; +} + +static int vibra_effect_mapping_set(struct vibra_info *info, u16 button, + struct vibra_effect *effect) +{ + u32 gpio_num, gpio_edge; + + if (button) { + gpio_num = FIELD_GET(CS40L50_GPIO_NUM_MASK, button); + gpio_edge = FIELD_GET(CS40L50_GPIO_EDGE_MASK, button); + effect->gpio_mapping = info->dsp.gpio_base_reg + + (gpio_num * 8) - gpio_edge; + + return regmap_write(info->regmap, effect->gpio_mapping, button); + } + + effect->gpio_mapping = CS40L50_GPIO_MAPPING_INVALID; + + return 0; +} + +static int vibra_effect_index_set(struct vibra_info *info, + struct vibra_effect *effect, + struct ff_periodic_effect add_effect) +{ + struct vibra_effect *owt_effect; + u32 base_index, max_index; + + base_index = info->dsp.banks[effect->bank].base_index; + max_index = info->dsp.banks[effect->bank].max_index; + + effect->index = base_index; + + switch (effect->bank) { + case WVFRM_BANK_OWT: + list_for_each_entry(owt_effect, &info->effect_head, list) + if (owt_effect->bank == WVFRM_BANK_OWT) + effect->index++; + break; + case WVFRM_BANK_ROM: + case WVFRM_BANK_RAM: + effect->index += add_effect.custom_data[1] & 0xffffu; + break; + default: + dev_err(info->dev, "Bank not supported: %d\n", effect->bank); + return -EINVAL; + } + + if (effect->index > max_index || effect->index < base_index) { + dev_err(info->dev, "Index out of bounds: %u\n", effect->index); + return -ENOSPC; + } + + return 0; +} + +/* Describes a header for an effect in the OWT bank */ +struct owt_header { + u32 type; + u32 data_words; + u32 offset; +} __packed; + +static int vibra_upload_owt(struct vibra_info *info, struct vibra_effect *effect, + struct ff_periodic_effect add_effect) +{ + u32 len, wt_offset, wt_size; + struct owt_header header; + u8 *out_data; + int error; + + error = regmap_read(info->regmap, info->dsp.owt_offset_reg, &wt_offset); + if (error) + return error; + + error = regmap_read(info->regmap, info->dsp.owt_size_reg, &wt_size); + if (error) + return error; + + len = 2 * add_effect.custom_len; + + if ((wt_size * sizeof(u32)) < CS40L50_OWT_HEADER_SIZE + len) + return -ENOSPC; + + out_data = kzalloc(CS40L50_OWT_HEADER_SIZE + len, GFP_KERNEL); + if (!out_data) + return -ENOMEM; + + header.type = add_effect.custom_data[0] == CS40L50_OWT_PCM_ID ? CS40L50_OWT_TYPE_PCM : + CS40L50_OWT_TYPE_PWLE; + header.offset = CS40L50_OWT_HEADER_SIZE / sizeof(u32); + header.data_words = len / sizeof(u32); + + memcpy(out_data, &header, sizeof(header)); + memcpy(out_data + CS40L50_OWT_HEADER_SIZE, add_effect.custom_data, len); + + error = regmap_bulk_write(info->regmap, info->dsp.owt_base_reg + + (wt_offset * sizeof(u32)), out_data, + CS40L50_OWT_HEADER_SIZE + len); + if (error) + goto err_free; + + error = regmap_write(info->regmap, info->dsp.mailbox_reg, + info->dsp.push_owt_cmd); + +err_free: + kfree(out_data); + + return error; +} + +static void vibra_add_worker(struct work_struct *work) +{ + struct vibra_info *info = container_of(work, struct vibra_info, add_work); + struct ff_effect add_effect = info->add_effect; + struct vibra_effect *effect; + bool is_new = false; + int error; + + error = pm_runtime_resume_and_get(info->dev); + if (error < 0) { + info->add_error = error; + return; + } + + mutex_lock(&info->lock); + + effect = vibra_find_effect(add_effect.id, &info->effect_head); + if (!effect) { + effect = kzalloc(sizeof(*effect), GFP_KERNEL); + if (!effect) { + error = -ENOMEM; + goto err_mutex; + } + effect->id = add_effect.id; + is_new = true; + } + + error = vibra_effect_bank_set(info, effect, add_effect.u.periodic); + if (error) + goto err_free; + + error = vibra_effect_index_set(info, effect, add_effect.u.periodic); + if (error) + goto err_free; + + error = vibra_effect_mapping_set(info, add_effect.trigger.button, effect); + if (error) + goto err_free; + + if (effect->bank == WVFRM_BANK_OWT) + error = vibra_upload_owt(info, effect, add_effect.u.periodic); + +err_free: + if (is_new) { + if (error) + kfree(effect); + else + list_add(&effect->list, &info->effect_head); + } + +err_mutex: + mutex_unlock(&info->lock); + + pm_runtime_mark_last_busy(info->dev); + pm_runtime_put_autosuspend(info->dev); + + info->add_error = error; +} + +static int vibra_add(struct input_dev *dev, struct ff_effect *effect, + struct ff_effect *old) +{ + struct vibra_info *info = input_get_drvdata(dev); + u32 len = effect->u.periodic.custom_len; + + if (effect->type != FF_PERIODIC || effect->u.periodic.waveform != FF_CUSTOM) { + dev_err(info->dev, "Type (%#X) or waveform (%#X) unsupported\n", + effect->type, effect->u.periodic.waveform); + return -EINVAL; + } + + memcpy(&info->add_effect, effect, sizeof(struct ff_effect)); + + info->add_effect.u.periodic.custom_data = kcalloc(len, sizeof(s16), GFP_KERNEL); + if (!info->add_effect.u.periodic.custom_data) + return -ENOMEM; + + if (copy_from_user(info->add_effect.u.periodic.custom_data, + effect->u.periodic.custom_data, sizeof(s16) * len)) { + info->add_error = -EFAULT; + goto out_free; + } + + queue_work(info->vibe_wq, &info->add_work); + flush_work(&info->add_work); +out_free: + kfree(info->add_effect.u.periodic.custom_data); + info->add_effect.u.periodic.custom_data = NULL; + + return info->add_error; +} + +static void vibra_start_worker(struct work_struct *work) +{ + struct vibra_info *info = container_of(work, struct vibra_info, + vibe_start_work); + struct vibra_effect *effect; + + if (pm_runtime_resume_and_get(info->dev) < 0) + return; + + mutex_lock(&info->lock); + + effect = vibra_find_effect(info->start_effect->id, &info->effect_head); + if (effect) + regmap_write(info->regmap, info->dsp.mailbox_reg, effect->index); + + mutex_unlock(&info->lock); + + if (!effect) + dev_err(info->dev, "Effect to play not found\n"); + + pm_runtime_mark_last_busy(info->dev); + pm_runtime_put_autosuspend(info->dev); +} + +static void vibra_stop_worker(struct work_struct *work) +{ + struct vibra_info *info = container_of(work, struct vibra_info, + vibe_stop_work); + + if (pm_runtime_resume_and_get(info->dev) < 0) + return; + + mutex_lock(&info->lock); + + regmap_write(info->regmap, info->dsp.mailbox_reg, info->dsp.stop_cmd); + + mutex_unlock(&info->lock); + + pm_runtime_mark_last_busy(info->dev); + pm_runtime_put_autosuspend(info->dev); +} + +static int vibra_playback(struct input_dev *dev, int effect_id, int val) +{ + struct vibra_info *info = input_get_drvdata(dev); + + if (val > 0) { + info->start_effect = &dev->ff->effects[effect_id]; + queue_work(info->vibe_wq, &info->vibe_start_work); + } else { + queue_work(info->vibe_wq, &info->vibe_stop_work); + } + + return 0; +} + +static void vibra_erase_worker(struct work_struct *work) +{ + struct vibra_info *info = container_of(work, struct vibra_info, + erase_work); + struct vibra_effect *owt_effect, *erase_effect; + int error; + + error = pm_runtime_resume_and_get(info->dev); + if (error < 0) { + info->erase_error = error; + return; + } + + mutex_lock(&info->lock); + + erase_effect = vibra_find_effect(info->erase_effect->id, + &info->effect_head); + if (!erase_effect) { + dev_err(info->dev, "Effect to erase not found\n"); + error = -EINVAL; + goto err_mutex; + } + + if (erase_effect->gpio_mapping != CS40L50_GPIO_MAPPING_INVALID) { + error = regmap_write(info->regmap, erase_effect->gpio_mapping, + CS40L50_GPIO_DISABLE); + if (error) + goto err_mutex; + } + + if (erase_effect->bank == WVFRM_BANK_OWT) { + error = regmap_write(info->regmap, info->dsp.mailbox_reg, + info->dsp.delete_owt_cmd | erase_effect->index); + if (error) + goto err_mutex; + + list_for_each_entry(owt_effect, &info->effect_head, list) + if (owt_effect->bank == WVFRM_BANK_OWT && + owt_effect->index > erase_effect->index) + owt_effect->index--; + } + + list_del(&erase_effect->list); + kfree(erase_effect); + +err_mutex: + mutex_unlock(&info->lock); + + pm_runtime_mark_last_busy(info->dev); + pm_runtime_put_autosuspend(info->dev); + + info->erase_error = error; +} + +static int vibra_erase(struct input_dev *dev, int effect_id) +{ + struct vibra_info *info = input_get_drvdata(dev); + + info->erase_effect = &dev->ff->effects[effect_id]; + + queue_work(info->vibe_wq, &info->erase_work); + flush_work(&info->erase_work); + + return info->erase_error; +} + +static struct vibra_bank cs40l50_banks[] = { + { + .bank = WVFRM_BANK_RAM, + .base_index = CS40L50_RAM_INDEX_START, + .max_index = CS40L50_RAM_INDEX_END, + }, + { + .bank = WVFRM_BANK_ROM, + .base_index = CS40L50_ROM_INDEX_START, + .max_index = CS40L50_ROM_INDEX_END, + }, + { + .bank = WVFRM_BANK_OWT, + .base_index = CS40L50_RTH_INDEX_START, + .max_index = CS40L50_RTH_INDEX_END, + }, +}; + +static struct vibra_dsp cs40l50_dsp = { + .banks = cs40l50_banks, + .gpio_base_reg = CS40L50_GPIO_BASE, + .owt_base_reg = CS40L50_OWT_BASE, + .owt_offset_reg = CS40L50_OWT_NEXT, + .owt_size_reg = CS40L50_OWT_SIZE, + .mailbox_reg = CS40L50_DSP_QUEUE, + .push_owt_cmd = CS40L50_OWT_PUSH, + .delete_owt_cmd = CS40L50_OWT_DELETE, + .stop_cmd = CS40L50_STOP_PLAYBACK, +}; + +static void vibra_input_unregister(void *data) +{ + input_unregister_device((struct input_dev *)data); +} + +static void vibra_remove_wq(void *data) +{ + struct vibra_info *info = data; + + flush_workqueue(info->vibe_wq); + destroy_workqueue(info->vibe_wq); +} + +static int cs40l50_vibra_probe(struct platform_device *pdev) +{ + struct cs40l50 *cs40l50 = dev_get_drvdata(pdev->dev.parent); + struct vibra_info *info; + int error; + + info = devm_kzalloc(pdev->dev.parent, sizeof(*info), GFP_KERNEL); + if (!info) + return -ENOMEM; + + info->dev = cs40l50->dev; + info->regmap = cs40l50->regmap; + + info->input = devm_input_allocate_device(info->dev); + if (!info->input) + return -ENOMEM; + + info->input->id.product = cs40l50->devid & 0xFFFF; + info->input->id.version = cs40l50->revid; + info->input->name = "cs40l50_vibra"; + + input_set_drvdata(info->input, info); + input_set_capability(info->input, EV_FF, FF_PERIODIC); + input_set_capability(info->input, EV_FF, FF_CUSTOM); + + error = input_ff_create(info->input, FF_MAX_EFFECTS); + if (error) { + dev_err(info->dev, "Failed to create input device\n"); + return error; + } + + info->input->ff->upload = vibra_add; + info->input->ff->playback = vibra_playback; + info->input->ff->erase = vibra_erase; + + INIT_LIST_HEAD(&info->effect_head); + + info->dsp = cs40l50_dsp; + + info->vibe_wq = alloc_ordered_workqueue("vibe_wq", 0); + if (!info->vibe_wq) + return -ENOMEM; + + error = devm_add_action_or_reset(info->dev, vibra_remove_wq, info); + if (error) + return error; + + mutex_init(&info->lock); + + INIT_WORK(&info->vibe_start_work, vibra_start_worker); + INIT_WORK(&info->vibe_stop_work, vibra_stop_worker); + INIT_WORK(&info->erase_work, vibra_erase_worker); + INIT_WORK(&info->add_work, vibra_add_worker); + + error = input_register_device(info->input); + if (error) { + dev_err(info->dev, "Failed to register input device\n"); + input_free_device(info->input); + return error; + } + + return devm_add_action_or_reset(info->dev, vibra_input_unregister, + info->input); +} + +static const struct platform_device_id vibra_id_match[] = { + { "cs40l50-vibra", }, + {} +}; +MODULE_DEVICE_TABLE(platform, vibra_id_match); + +static struct platform_driver cs40l50_vibra_driver = { + .probe = cs40l50_vibra_probe, + .id_table = vibra_id_match, + .driver = { + .name = "cs40l50-vibra", + }, +}; +module_platform_driver(cs40l50_vibra_driver); + +MODULE_DESCRIPTION("CS40L50 Advanced Haptic Driver"); +MODULE_AUTHOR("James Ogletree, Cirrus Logic Inc. james.ogletree@cirrus.com"); +MODULE_LICENSE("GPL");