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@xxxxxxxxxxxxxxxxxxxxx>
---
v7: v8: v9:
Please advise if playback stop is still misused with respect to not
specifying an effect ID. The device can only play one effect at a
time, but setting max effects for the EVIOCGEFFECTS ioctl to 1 would
restrict the number of uploads to 1 as well. So I'm unsure of the correct
approach here.
MAINTAINERS | 1 +
drivers/input/misc/Kconfig | 10 +
drivers/input/misc/Makefile | 1 +
drivers/input/misc/cs40l50-vibra.c | 578 +++++++++++++++++++++++++++++
4 files changed, 590 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@xxxxxxxxxx>
L: patches@xxxxxxxxxxxxxxxxxxxxx
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..c7e68862bbfe
--- /dev/null
+++ b/drivers/input/misc/cs40l50-vibra.c
@@ -0,0 +1,578 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * CS40L50 Advanced Haptic Driver with waveform memory,
+ * integrated DSP, and closed-loop algorithms
+ *
+ * Copyright 2024 Cirrus Logic, Inc.
+ *
+ * Author: James Ogletree <james.ogletree@xxxxxxxxxx>
+ */
+
+#include <linux/bitfield.h>
+#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_TYPE_PCM 8
+#define CS40L50_TYPE_PWLE 12
+#define CS40L50_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_NONE 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_reg;
+ 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;
+ int (*write)(struct device *dev, struct regmap *regmap, u32 val);
+ 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 list_head effect_head;
+ struct vibra_dsp dsp;
+};
+
+struct vibra_work {
+ struct vibra_info *info;
+ struct ff_effect *effect;
+ struct work_struct work;
+ s16 *custom_data;
+ int custom_len;
+ int count;
+ int 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,
+
+ .push_owt_cmd = CS40L50_OWT_PUSH,
+ .delete_owt_cmd = CS40L50_OWT_DELETE,
+ .stop_cmd = CS40L50_STOP_PLAYBACK,
+
+ .write = cs40l50_dsp_write,
+};
+
+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_work *work_data,
+ struct vibra_effect *effect)
+{
+ s16 bank = work_data->custom_data[0] & 0xffffu;
+
+ if (bank >= WVFRM_BANK_NUM) {
+ dev_err(work_data->info->dev, "Invalid waveform bank: %d\n", bank);
+ return -EINVAL;
+ }
+
+ if (work_data->custom_len > CS40L50_OWT_CUSTOM_DATA_SIZE)
+ effect->bank = WVFRM_BANK_OWT;
+ else
+ effect->bank = bank;
+
+ return 0;
+}
+
+static int vibra_effect_gpio_mapping_set(struct vibra_work *work_data,
+ struct vibra_effect *effect)
+{
+ u16 button = work_data->effect->trigger.button;
+ struct vibra_info *info = work_data->info;
+ 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_reg = info->dsp.gpio_base_reg + (gpio_num * 8) - gpio_edge;
+
+ return regmap_write(info->regmap, effect->gpio_reg, button);
+ }
+
+ effect->gpio_reg = CS40L50_GPIO_MAPPING_NONE;
+
+ return 0;
+}
+
+static int vibra_effect_index_set(struct vibra_work *work_data,
+ struct vibra_effect *effect)
+{
+ struct vibra_info *info = work_data->info;
+ 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 += work_data->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 OWT effect */
+struct owt_header {
+ u32 type;
+ u32 data_words;
+ u32 offset;
+} __packed;
+
+static int vibra_upload_owt(struct vibra_work *work_data)
+{
+ u32 len = 2 * work_data->custom_len, wt_offset, wt_size;
+ struct vibra_info *info = work_data->info;
+ struct owt_header header;
+ u8 *out_data;
+ int error;
+
+ error = regmap_read(info->regmap, info->dsp.owt_size_reg, &wt_size);
+ if (error)
+ return error;
+
+ if ((wt_size * sizeof(u32)) < sizeof(header) + len) {
+ dev_err(info->dev, "No space in OWT bank for effect\n");
+ return -ENOSPC;
+ }
+
+ out_data = kzalloc(sizeof(header) + len, GFP_KERNEL);
+ if (!out_data)
+ return -ENOMEM;
+
+ header.type = work_data->custom_data[0] == CS40L50_PCM_ID ? CS40L50_TYPE_PCM :
+ CS40L50_TYPE_PWLE;
+ header.offset = sizeof(header) / sizeof(u32);
+ header.data_words = len / sizeof(u32);
+
+ memcpy(out_data, &header, sizeof(header));
+ memcpy(out_data + sizeof(header), work_data->custom_data, len);
+
+ error = regmap_read(info->regmap, info->dsp.owt_offset_reg, &wt_offset);
+ if (error)
+ goto err_free;
+
+ error = regmap_bulk_write(info->regmap, info->dsp.owt_base_reg +
+ (wt_offset * sizeof(u32)), out_data,
+ sizeof(header) + len);
+ if (error)
+ goto err_free;
+
+ error = info->dsp.write(info->dev, info->regmap, info->dsp.push_owt_cmd);
+err_free:
+ kfree(out_data);
+
+ return error;
+}
+
+static void vibra_add_worker(struct work_struct *work)
+{
+ struct vibra_work *work_data = container_of(work, struct vibra_work, work);
+ struct vibra_info *info = work_data->info;
+ struct vibra_effect *effect;
+ bool is_new = false;
+ int error;
+
+ error = pm_runtime_resume_and_get(info->dev);
+ if (error < 0)
+ goto err;
+
+ mutex_lock(&info->lock);
+
+ /* Update effect if already present, otherwise create new effect */
+ effect = vibra_find_effect(work_data->effect->id, &info->effect_head);
+ if (!effect) {
+ effect = kzalloc(sizeof(*effect), GFP_KERNEL);
+ if (!effect) {
+ error = -ENOMEM;
+ goto err_mutex;
+ }
+
+ effect->id = work_data->effect->id;
+ is_new = true;
+ }
+
+ error = vibra_effect_bank_set(work_data, effect);
+ if (error)
+ goto err_free;
+
+ error = vibra_effect_index_set(work_data, effect);
+ if (error)
+ goto err_free;
+
+ error = vibra_effect_gpio_mapping_set(work_data, effect);
+ if (error)
+ goto err_free;
+
+ if (effect->bank == WVFRM_BANK_OWT)
+ error = vibra_upload_owt(work_data);
+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);
+err:
+ work_data->error = error;
+}
+
+static int vibra_add(struct input_dev *dev, struct ff_effect *effect,
+ struct ff_effect *old)
+{
+ struct ff_periodic_effect *periodic = &effect->u.periodic;
+ struct vibra_info *info = input_get_drvdata(dev);
+ u32 len = effect->u.periodic.custom_len;
+ struct vibra_work work_data;
+
+ if (effect->type != FF_PERIODIC || periodic->waveform != FF_CUSTOM) {
+ dev_err(info->dev, "Type (%#X) or waveform (%#X) unsupported\n",
+ effect->type, periodic->waveform);
+ return -EINVAL;
+ }
+
+ work_data.custom_data = kcalloc(len, sizeof(s16), GFP_KERNEL);
+ if (!work_data.custom_data)
+ return -ENOMEM;
+
+ if (copy_from_user(work_data.custom_data, effect->u.periodic.custom_data,
+ sizeof(s16) * len)) {
+ work_data.error = -EFAULT;
+ goto err_free;
+ }
+
+ work_data.custom_len = len;
+ work_data.info = info;
+ work_data.effect = effect;
+ INIT_WORK(&work_data.work, vibra_add_worker);
+
+ /* Push to the workqueue to serialize with playbacks */
+ queue_work(info->vibe_wq, &work_data.work);
+ flush_work(&work_data.work);
+err_free:
+ kfree(work_data.custom_data);
+
+ return work_data.error;
+}
+
+static void vibra_start_worker(struct work_struct *work)
+{
+ struct vibra_work *work_data = container_of(work, struct vibra_work, work);
+ struct vibra_info *info = work_data->info;
+ struct vibra_effect *start_effect;
+
+ if (pm_runtime_resume_and_get(info->dev) < 0)
+ goto err_free;
+
+ mutex_lock(&info->lock);
+
+ start_effect = vibra_find_effect(work_data->effect->id, &info->effect_head);
+ if (start_effect) {
+ while (--work_data->count >= 0) {
+ info->dsp.write(info->dev, info->regmap, start_effect->index);
+ usleep_range(work_data->effect->replay.length,
+ work_data->effect->replay.length + 100);
+ }
+ }
+
+ mutex_unlock(&info->lock);
+
+ if (!start_effect)
+ dev_err(info->dev, "Effect to play not found\n");
+
+ pm_runtime_mark_last_busy(info->dev);
+ pm_runtime_put_autosuspend(info->dev);
+err_free:
+ kfree(work_data);
+}
+
+static void vibra_stop_worker(struct work_struct *work)
+{
+ struct vibra_work *work_data = container_of(work, struct vibra_work, work);
+ struct vibra_info *info = work_data->info;
+
+ if (pm_runtime_resume_and_get(info->dev) < 0)
+ return;
+
+ mutex_lock(&info->lock);
+
+ info->dsp.write(info->dev, info->regmap, info->dsp.stop_cmd);
+
+ mutex_unlock(&info->lock);
+
+ pm_runtime_mark_last_busy(info->dev);
+ pm_runtime_put_autosuspend(info->dev);
+
+ kfree(work_data);
+}
+
+static int vibra_playback(struct input_dev *dev, int effect_id, int val)
+{
+ struct vibra_info *info = input_get_drvdata(dev);
+ struct vibra_work *work_data;
+
+ work_data = kzalloc(sizeof(*work_data), GFP_ATOMIC);
+ if (!work_data)
+ return -ENOMEM;
+
+ work_data->info = info;
+
+ if (val > 0) {
+ work_data->effect = &dev->ff->effects[effect_id];
+ work_data->count = val;
+ INIT_WORK(&work_data->work, vibra_start_worker);
+ } else {
+ /* Stop the amplifier as device drives only one effect */
+ INIT_WORK(&work_data->work, vibra_stop_worker);
+ }
+
+ queue_work(info->vibe_wq, &work_data->work);
+
+ return 0;
+}
+
+static void vibra_erase_worker(struct work_struct *work)
+{
+ struct vibra_work *work_data = container_of(work, struct vibra_work, work);
+ struct vibra_effect *owt_effect, *erase_effect;
+ struct vibra_info *info = work_data->info;
+ int error;
+
+ error = pm_runtime_resume_and_get(info->dev);
+ if (error < 0)
+ goto err;
+
+ mutex_lock(&info->lock);
+
+ erase_effect = vibra_find_effect(work_data->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_reg != CS40L50_GPIO_MAPPING_NONE) {
+ error = regmap_write(info->regmap, erase_effect->gpio_reg,
+ CS40L50_GPIO_DISABLE);
+ if (error)
+ goto err_mutex;
+ }
+
+ if (erase_effect->bank == WVFRM_BANK_OWT) {
+ error = info->dsp.write(info->dev, info->regmap,
+ 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);
+err:
+ work_data->error = error;
+}
+
+static int vibra_erase(struct input_dev *dev, int effect_id)
+{
+ struct vibra_info *info = input_get_drvdata(dev);
+ struct vibra_work work_data;
+
+ work_data.info = info;
+ work_data.effect = &dev->ff->effects[effect_id];
+
+ INIT_WORK(&work_data.work, vibra_erase_worker);
+
+ /* Push to workqueue to serialize with playbacks */
+ queue_work(info->vibe_wq, &work_data.work);
+ flush_work(&work_data.work);
+
+ return work_data.error;
+}
+
+static void vibra_remove_wq(void *data)
+{
+ flush_workqueue(data);
+ destroy_workqueue(data);
+}
+
+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;
+
+ mutex_init(&info->lock);
+
+ info->dev = cs40l50->dev;
+ info->regmap = cs40l50->regmap;
+ info->dsp = cs40l50_dsp;
+
+ 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->vibe_wq = alloc_ordered_workqueue("vibe_wq", WQ_HIGHPRI);
+ if (!info->vibe_wq)
+ return -ENOMEM;
+
+ error = devm_add_action_or_reset(info->dev, vibra_remove_wq, info->vibe_wq);
+ if (error)
+ return error;
+
+ return input_register_device(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@xxxxxxxxxx>");
+MODULE_LICENSE("GPL");
--
2.25.1
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