[v4,1/5] mfd: Add support for Intel LJCA device

Message ID	20230309071100.2856899-2-xiang.ye@intel.com (mailing list archive)
State	Superseded
Headers	show Return-Path: <linux-spi-owner@vger.kernel.org> From: Ye Xiang <xiang.ye@intel.com> To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Arnd Bergmann <arnd@arndb.de>, Matthias Kaehlcke <mka@chromium.org>, Lee Jones <lee@kernel.org>, Wolfram Sang <wsa@kernel.org>, Tyrone Ting <kfting@nuvoton.com>, Mark Brown <broonie@kernel.org>, Linus Walleij <linus.walleij@linaro.org>, Bartosz Golaszewski <brgl@bgdev.pl>, linux-usb@vger.kernel.org, linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org, linux-spi@vger.kernel.org, linux-gpio@vger.kernel.org Cc: srinivas.pandruvada@intel.com, heikki.krogerus@linux.intel.com, andriy.shevchenko@linux.intel.com, sakari.ailus@linux.intel.com, zhifeng.wang@intel.com, wentong.wu@intel.com, lixu.zhang@intel.com, Ye Xiang <xiang.ye@intel.com> Subject: [PATCH v4 1/5] mfd: Add support for Intel LJCA device Date: Thu, 9 Mar 2023 15:10:56 +0800 Message-Id: <20230309071100.2856899-2-xiang.ye@intel.com> In-Reply-To: <20230309071100.2856899-1-xiang.ye@intel.com> References: <20230309071100.2856899-1-xiang.ye@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk
Series	Add Intel LJCA device driver \| expand [v4,0/5] Add Intel LJCA device driver [v4,1/5] mfd: Add support for Intel LJCA device [v4,2/5] gpio: Add support for Intel LJCA USB GPIO driver [v4,3/5] i2c: Add support for Intel LJCA USB I2C driver [v4,4/5] spi: Add support for Intel LJCA USB SPI driver [v4,5/5] Documentation: Add ABI doc for attributes of LJCA device

diff --git a/drivers/usb/misc/Kconfig b/drivers/usb/misc/Kconfig index a5f7652db7da..59ec120c26d4 100644 --- a/drivers/usb/misc/Kconfig +++ b/drivers/usb/misc/Kconfig @@ -273,6 +273,19 @@ config USB_LINK_LAYER_TEST Layer Test Device. Say Y only when you want to conduct USB Super Speed Link Layer Test for host controllers. +config USB_LJCA + tristate "Intel La Jolla Cove Adapter support" + select MFD_CORE + depends on USB + help + This adds support for Intel La Jolla Cove USB-I2C/SPI/GPIO + Master Adapter (LJCA). Additional drivers such as I2C_LJCA, + GPIO_LJCA and SPI_LJCA must be enabled in order to use the + functionality of the device. + + This driver can also be built as a module. If so, the module + will be called ljca. + config USB_CHAOSKEY tristate "ChaosKey random number generator driver support" depends on HW_RANDOM diff --git a/drivers/usb/misc/Makefile b/drivers/usb/misc/Makefile index 93581baec3a8..6f6adfbe17e0 100644 --- a/drivers/usb/misc/Makefile +++ b/drivers/usb/misc/Makefile @@ -29,6 +29,7 @@ obj-$(CONFIG_USB_HUB_USB251XB) += usb251xb.o obj-$(CONFIG_USB_HSIC_USB3503) += usb3503.o obj-$(CONFIG_USB_HSIC_USB4604) += usb4604.o obj-$(CONFIG_USB_CHAOSKEY) += chaoskey.o +obj-$(CONFIG_USB_LJCA) += ljca.o obj-$(CONFIG_USB_SISUSBVGA) += sisusbvga/ obj-$(CONFIG_USB_LINK_LAYER_TEST) += lvstest.o diff --git a/drivers/usb/misc/ljca.c b/drivers/usb/misc/ljca.c new file mode 100644 index 000000000000..e9520f3d2904 --- /dev/null +++ b/drivers/usb/misc/ljca.c @@ -0,0 +1,969 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Intel La Jolla Cove Adapter USB driver + * + * Copyright (c) 2023, Intel Corporation. + */ + +#include <linux/dev_printk.h> +#include <linux/kernel.h> +#include <linux/mfd/core.h> +#include <linux/mfd/ljca.h> +#include <linux/module.h> +#include <linux/mod_devicetable.h> +#include <linux/mutex.h> +#include <linux/platform_device.h> +#include <linux/slab.h> +#include <linux/types.h> +#include <linux/usb.h> + +enum ljca_acpi_match_adr { + LJCA_ACPI_MATCH_GPIO, + LJCA_ACPI_MATCH_I2C1, + LJCA_ACPI_MATCH_I2C2, + LJCA_ACPI_MATCH_SPI1, + LJCA_ACPI_MATCH_SPI2, +}; + +static struct mfd_cell_acpi_match ljca_acpi_match_gpio = { + .adr = LJCA_ACPI_MATCH_GPIO, +}; + +static struct mfd_cell_acpi_match ljca_acpi_match_i2cs[] = { + { + .adr = LJCA_ACPI_MATCH_I2C1, + }, + { + .adr = LJCA_ACPI_MATCH_I2C2, + }, +}; + +static struct mfd_cell_acpi_match ljca_acpi_match_spis[] = { + { + .adr = LJCA_ACPI_MATCH_SPI1, + }, + { + .adr = LJCA_ACPI_MATCH_SPI2, + }, +}; + +struct ljca_msg { + u8 type; + u8 cmd; + u8 flags; + u8 len; + u8 data[]; +} __packed; + +struct fw_version { + u8 major; + u8 minor; + __le16 patch; + __le16 build; +} __packed; + +/** + * enum ljca_stub_type - Stub type supported by LJCA. + * @LJCA_MNG_STUB: Provides Management messages. + * @LJCA_DIAG_STUB: provides Diagnose messages. + * @LJCA_GPIO_STUB: provides GPIO functionality. + * @LJCA_I2C_STUB: provides I2C functionality. + * @LJCA_SPI_STUB: provides SPI functionality. + */ +enum ljca_stub_type { + LJCA_MNG_STUB = 1, + LJCA_DIAG_STUB, + LJCA_GPIO_STUB, + LJCA_I2C_STUB, + LJCA_SPI_STUB, +}; + +/* command Flags */ +#define LJCA_ACK_FLAG BIT(0) +#define LJCA_RESP_FLAG BIT(1) +#define LJCA_CMPL_FLAG BIT(2) + +/* MNG stub commands */ +enum ljca_mng_cmd { + LJCA_MNG_GET_VERSION = 1, + LJCA_MNG_RESET_NOTIFY, + LJCA_MNG_RESET, + LJCA_MNG_ENUM_GPIO, + LJCA_MNG_ENUM_I2C, + LJCA_MNG_POWER_STATE_CHANGE, + LJCA_MNG_SET_DFU_MODE, + LJCA_MNG_ENUM_SPI, +}; + +/* DIAG commands */ +enum ljca_diag_cmd { + LJCA_DIAG_GET_STATE = 1, + LJCA_DIAG_GET_STATISTIC, + LJCA_DIAG_SET_TRACE_LEVEL, + LJCA_DIAG_SET_ECHO_MODE, + LJCA_DIAG_GET_FW_LOG, + LJCA_DIAG_GET_FW_COREDUMP, + LJCA_DIAG_TRIGGER_WDT, + LJCA_DIAG_TRIGGER_FAULT, + LJCA_DIAG_FEED_WDT, + LJCA_DIAG_GET_SECURE_STATE, +}; + +struct ljca_i2c_ctr_info { + u8 id; + u8 capacity; + u8 intr_pin; +} __packed; + +struct ljca_i2c_descriptor { + u8 num; + struct ljca_i2c_ctr_info info[]; +} __packed; + +struct ljca_spi_ctr_info { + u8 id; + u8 capacity; +} __packed; + +struct ljca_spi_descriptor { + u8 num; + struct ljca_spi_ctr_info info[]; +} __packed; + +struct ljca_bank_descriptor { + u8 bank_id; + u8 pin_num; + + /* 1 bit for each gpio, 1 means valid */ + u32 valid_pins; +} __packed; + +struct ljca_gpio_descriptor { + u8 pins_per_bank; + u8 bank_num; + struct ljca_bank_descriptor bank_desc[]; +} __packed; + +#define LJCA_MAX_PACKET_SIZE 64 +#define LJCA_MAX_PAYLOAD_SIZE (LJCA_MAX_PACKET_SIZE - sizeof(struct ljca_msg)) +#define LJCA_USB_WRITE_TIMEOUT_MS 200 +#define LJCA_USB_WRITE_ACK_TIMEOUT_MS 500 +#define LJCA_USB_ENUM_STUB_TIMEOUT_MS 20 + +struct ljca_event_cb_entry { + ljca_event_cb_t notify; + void *context; +}; + +struct ljca_dev { + struct usb_device *udev; + struct usb_interface *intf; + u8 in_ep; /* the address of the bulk in endpoint */ + u8 out_ep; /* the address of the bulk out endpoint */ + + /* the urb/buffer for read */ + struct urb *in_urb; + unsigned char *ibuf; + size_t ibuf_len; + + bool started; + struct list_head stubs_list; + + /* to wait for an ongoing write ack */ + wait_queue_head_t ack_wq; + + struct mfd_cell *cells; + int cell_count; + /* mutex to protect package transfer with LJCA device */ + struct mutex mutex; +}; + +struct ljca { + u8 type; + struct ljca_dev *dev; +}; + +struct ljca_stub_packet { + unsigned int *ibuf_len; + u8 *ibuf; +}; + +struct ljca_stub { + struct list_head list; + struct usb_interface *intf; + struct ljca_stub_packet ipacket; + u8 type; + + /* for identify ack */ + bool acked; + int cur_cmd; + + struct ljca_event_cb_entry event_entry; + /* lock to protect event_entry */ + spinlock_t event_cb_lock; + + struct ljca ljca; + unsigned long priv[]; +}; + +static inline void *ljca_priv(struct ljca_stub *stub) +{ + return stub->priv; +} + +static bool ljca_validate(struct ljca_msg *header, u32 data_len) +{ + return header->len + sizeof(*header) == data_len; +} + +static struct ljca_stub *ljca_stub_alloc(struct ljca_dev *dev, u8 type, int priv_size) +{ + struct ljca_stub *stub; + + stub = kzalloc(struct_size(stub, priv, priv_size), GFP_KERNEL); + if (!stub) + return ERR_PTR(-ENOMEM); + + stub->type = type; + stub->intf = dev->intf; + stub->ljca.dev = dev; + stub->ljca.type = stub->type; + spin_lock_init(&stub->event_cb_lock); + list_add_tail(&stub->list, &dev->stubs_list); + return stub; +} + +static struct ljca_stub *ljca_stub_find(struct ljca_dev *dev, u8 type) +{ + struct ljca_stub *stub; + + list_for_each_entry(stub, &dev->stubs_list, list) { + if (stub->type == type) + return stub; + } + + dev_err(&dev->intf->dev, "USB stub not found, type:%d\n", type); + return ERR_PTR(-ENODEV); +} + +static void ljca_stub_notify(struct ljca_stub *stub, u8 cmd, const void *evt_data, int len) +{ + unsigned long flags; + + spin_lock_irqsave(&stub->event_cb_lock, flags); + if (stub->event_entry.notify && stub->event_entry.context) + stub->event_entry.notify(stub->event_entry.context, cmd, evt_data, len); + spin_unlock_irqrestore(&stub->event_cb_lock, flags); +} + +static int ljca_parse(struct ljca_dev *dev, struct ljca_msg *header) +{ + struct ljca_stub *stub; + + stub = ljca_stub_find(dev, header->type); + if (IS_ERR(stub)) + return PTR_ERR(stub); + + if (!(header->flags & LJCA_ACK_FLAG)) { + ljca_stub_notify(stub, header->cmd, header->data, header->len); + return 0; + } + + if (stub->cur_cmd != header->cmd) { + dev_err(&dev->intf->dev, "header and stub current command mismatch (%x vs %x)\n", + header->cmd, stub->cur_cmd); + return -EINVAL; + } + + if (stub->ipacket.ibuf && stub->ipacket.ibuf_len) { + unsigned int newlen; + + newlen = min_t(unsigned int, header->len, *stub->ipacket.ibuf_len); + + *stub->ipacket.ibuf_len = newlen; + memcpy(stub->ipacket.ibuf, header->data, newlen); + } + + stub->acked = true; + wake_up(&dev->ack_wq); + + return 0; +} + +static int ljca_stub_write(struct ljca_stub *stub, u8 cmd, const void *obuf, unsigned int obuf_len, + void *ibuf, unsigned int *ibuf_len, bool wait_ack, unsigned long timeout) +{ + struct ljca_dev *dev = usb_get_intfdata(stub->intf); + u8 flags = LJCA_CMPL_FLAG; + struct ljca_msg *header; + unsigned int msg_len = sizeof(*header) + obuf_len; + int actual; + int ret; + + if (msg_len > LJCA_MAX_PACKET_SIZE) + return -EINVAL; + + if (wait_ack) + flags |= LJCA_ACK_FLAG; + + header = kmalloc(msg_len, GFP_KERNEL); + if (!header) + return -ENOMEM; + + header->type = stub->type; + header->cmd = cmd; + header->flags = flags; + header->len = obuf_len; + + if (obuf) + memcpy(header->data, obuf, obuf_len); + + dev_dbg(&dev->intf->dev, "send: type:%d cmd:%d flags:%d len:%d\n", header->type, + header->cmd, header->flags, header->len); + + usb_autopm_get_interface(dev->intf); + if (!dev->started) { + ret = -ENODEV; + goto error_put; + } + + mutex_lock(&dev->mutex); + stub->cur_cmd = cmd; + stub->ipacket.ibuf = ibuf; + stub->ipacket.ibuf_len = ibuf_len; + stub->acked = false; + ret = usb_bulk_msg(dev->udev, usb_sndbulkpipe(dev->udev, dev->out_ep), header, msg_len, + &actual, LJCA_USB_WRITE_TIMEOUT_MS); + kfree(header); + if (ret) { + dev_err(&dev->intf->dev, "bridge write failed ret:%d\n", ret); + goto error_unlock; + } + + if (actual != msg_len) { + dev_err(&dev->intf->dev, "bridge write length mismatch (%d vs %d)\n", msg_len, + actual); + ret = -EINVAL; + goto error_unlock; + } + + if (wait_ack) { + ret = wait_event_timeout(dev->ack_wq, stub->acked, msecs_to_jiffies(timeout)); + if (!ret) { + dev_err(&dev->intf->dev, "acked wait timeout\n"); + ret = -ETIMEDOUT; + goto error_unlock; + } + } + + stub->ipacket.ibuf = NULL; + stub->ipacket.ibuf_len = NULL; + ret = 0; +error_unlock: + mutex_unlock(&dev->mutex); +error_put: + usb_autopm_put_interface(dev->intf); + return ret; +} + +static int ljca_transfer_internal(struct ljca *ljca, u8 cmd, const void *obuf, + unsigned int obuf_len, void *ibuf, unsigned int *ibuf_len, + bool wait_ack) +{ + struct ljca_stub *stub; + + stub = ljca_stub_find(ljca->dev, ljca->type); + if (IS_ERR(stub)) + return PTR_ERR(stub); + + return ljca_stub_write(stub, cmd, obuf, obuf_len, ibuf, ibuf_len, wait_ack, + LJCA_USB_WRITE_ACK_TIMEOUT_MS); +} + +int ljca_transfer(struct ljca *ljca, u8 cmd, const void *obuf, unsigned int obuf_len, void *ibuf, + unsigned int *ibuf_len) +{ + return ljca_transfer_internal(ljca, cmd, obuf, obuf_len, ibuf, ibuf_len, true); +} +EXPORT_SYMBOL_NS_GPL(ljca_transfer, LJCA); + +int ljca_transfer_noack(struct ljca *ljca, u8 cmd, const void *obuf, unsigned int obuf_len) +{ + return ljca_transfer_internal(ljca, cmd, obuf, obuf_len, NULL, NULL, false); +} +EXPORT_SYMBOL_NS_GPL(ljca_transfer_noack, LJCA); + +int ljca_register_event_cb(struct ljca *ljca, ljca_event_cb_t event_cb, void *context) +{ + struct ljca_stub *stub; + unsigned long flags; + + stub = ljca_stub_find(ljca->dev, ljca->type); + if (IS_ERR(stub)) + return PTR_ERR(stub); + + spin_lock_irqsave(&stub->event_cb_lock, flags); + stub->event_entry.notify = event_cb; + stub->event_entry.context = context; + spin_unlock_irqrestore(&stub->event_cb_lock, flags); + + return 0; +} +EXPORT_SYMBOL_NS_GPL(ljca_register_event_cb, LJCA); + +void ljca_unregister_event_cb(struct ljca *ljca) +{ + struct ljca_stub *stub; + unsigned long flags; + + stub = ljca_stub_find(ljca->dev, ljca->type); + if (IS_ERR(stub)) + return; + + spin_lock_irqsave(&stub->event_cb_lock, flags); + stub->event_entry.notify = NULL; + stub->event_entry.context = NULL; + spin_unlock_irqrestore(&stub->event_cb_lock, flags); +} +EXPORT_SYMBOL_NS_GPL(ljca_unregister_event_cb, LJCA); + +static void ljca_stub_cleanup(struct ljca_dev *dev) +{ + struct ljca_stub *stub, *next; + + list_for_each_entry_safe(stub, next, &dev->stubs_list, list) { + list_del_init(&stub->list); + kfree(stub); + } +} + +static void ljca_read_complete(struct urb *urb) +{ + struct ljca_msg *header = urb->transfer_buffer; + struct ljca_dev *dev = urb->context; + int len = urb->actual_length; + int ret; + + WARN_ON_ONCE(!dev); + WARN_ON_ONCE(!header); + + if (urb->status) { + /* sync/async unlink faults aren't errors */ + if (urb->status == -ENOENT || urb->status == -ECONNRESET || + urb->status == -ESHUTDOWN) + return; + + dev_err(&dev->intf->dev, "read bulk urb transfer failed: %d\n", urb->status); + goto resubmit; + } + + dev_dbg(&dev->intf->dev, "receive: type:%d cmd:%d flags:%d len:%d\n", header->type, + header->cmd, header->flags, header->len); + + if (!ljca_validate(header, len)) { + dev_err(&dev->intf->dev, "data not correct header->len:%d payload_len:%d\n ", + header->len, len); + goto resubmit; + } + + ret = ljca_parse(dev, header); + if (ret) + dev_err(&dev->intf->dev, "failed to parse data: ret:%d type:%d len:%d\n", ret, + header->type, header->len); + +resubmit: + ret = usb_submit_urb(urb, GFP_ATOMIC); + if (ret) + dev_err(&dev->intf->dev, "failed submitting read urb, error %d\n", ret); +} + +static int ljca_start(struct ljca_dev *dev) +{ + int ret; + + usb_fill_bulk_urb(dev->in_urb, dev->udev, usb_rcvbulkpipe(dev->udev, dev->in_ep), dev->ibuf, + dev->ibuf_len, ljca_read_complete, dev); + + ret = usb_submit_urb(dev->in_urb, GFP_KERNEL); + if (ret) + dev_err(&dev->intf->dev, "failed submitting read urb, error %d\n", ret); + + dev->started = true; + return ret; +} + +struct ljca_mng_priv { + u32 reset_id; +}; + +static int ljca_mng_reset_handshake(struct ljca_stub *stub) +{ + struct ljca_mng_priv *priv; + __le32 reset_id; + __le32 reset_id_ret = 0; + unsigned int ilen = sizeof(__le32); + int ret; + + priv = ljca_priv(stub); + reset_id = cpu_to_le32(priv->reset_id++); + ret = ljca_stub_write(stub, LJCA_MNG_RESET_NOTIFY, &reset_id, sizeof(reset_id), + &reset_id_ret, &ilen, true, LJCA_USB_WRITE_ACK_TIMEOUT_MS); + if (ret) + return ret; + + if (ilen != sizeof(reset_id_ret) || reset_id_ret != reset_id) { + dev_err(&stub->intf->dev, "mng reset notify failed reset_id:%u/%u\n", + le32_to_cpu(reset_id_ret), le32_to_cpu(reset_id)); + return -EINVAL; + } + + return 0; +} + +static int ljca_add_mfd_cell(struct ljca_dev *dev, struct mfd_cell *cell) +{ + struct mfd_cell *new_cells; + + new_cells = krealloc_array(dev->cells, dev->cell_count + 1, sizeof(*new_cells), GFP_KERNEL); + if (!new_cells) + return -ENOMEM; + + memcpy(&new_cells[dev->cell_count], cell, sizeof(*cell)); + dev->cells = new_cells; + dev->cell_count++; + + return 0; +} + +static int ljca_gpio_stub_init(struct ljca_dev *dev, struct ljca_gpio_descriptor *desc) +{ + u32 valid_pin[LJCA_MAX_GPIO_NUM / BITS_PER_TYPE(u32)]; + struct ljca_gpio_info *gpio_info; + struct mfd_cell cell = {}; + struct ljca_stub *stub; + int gpio_num; + int i; + + gpio_num = desc->pins_per_bank * desc->bank_num; + if (gpio_num > LJCA_MAX_GPIO_NUM) + return -EINVAL; + + stub = ljca_stub_alloc(dev, LJCA_GPIO_STUB, sizeof(*gpio_info)); + if (IS_ERR(stub)) + return PTR_ERR(stub); + + gpio_info = ljca_priv(stub); + gpio_info->ljca = &stub->ljca; + gpio_info->num = gpio_num; + + for (i = 0; i < desc->bank_num; i++) + valid_pin[i] = desc->bank_desc[i].valid_pins; + + bitmap_from_arr32(gpio_info->valid_pin_map, valid_pin, gpio_num); + + cell.name = "ljca-gpio"; + cell.platform_data = gpio_info; + cell.pdata_size = sizeof(*gpio_info); + cell.acpi_match = &ljca_acpi_match_gpio; + + return ljca_add_mfd_cell(dev, &cell); +} + +static int ljca_mng_enum_gpio(struct ljca_stub *stub) +{ + struct ljca_dev *dev = usb_get_intfdata(stub->intf); + char buf[LJCA_MAX_PAYLOAD_SIZE]; + struct ljca_gpio_descriptor *desc; + unsigned int len = LJCA_MAX_PAYLOAD_SIZE; + int ret; + + ret = ljca_stub_write(stub, LJCA_MNG_ENUM_GPIO, NULL, 0, buf, &len, true, + LJCA_USB_ENUM_STUB_TIMEOUT_MS); + if (ret) + return ret; + + desc = (struct ljca_gpio_descriptor *)buf; + if (len != struct_size(desc, bank_desc, desc->bank_num)) { + dev_err(&stub->intf->dev, "GPIO enumeration failed, len:%u bank_num:%u\n", len, + desc->bank_num); + return -EINVAL; + } + + return ljca_gpio_stub_init(dev, desc); +} + +static int ljca_i2c_stub_init(struct ljca_dev *dev, struct ljca_i2c_descriptor *desc) +{ + struct ljca_i2c_info *i2c_info; + struct ljca_stub *stub; + int ret; + int i; + + stub = ljca_stub_alloc(dev, LJCA_I2C_STUB, size_mul(desc->num, sizeof(*i2c_info))); + if (IS_ERR(stub)) + return PTR_ERR(stub); + + i2c_info = ljca_priv(stub); + + for (i = 0; i < desc->num; i++) { + struct mfd_cell cell = {}; + + i2c_info[i].ljca = &stub->ljca; + i2c_info[i].id = desc->info[i].id; + i2c_info[i].capacity = desc->info[i].capacity; + i2c_info[i].intr_pin = desc->info[i].intr_pin; + + cell.name = "ljca-i2c"; + cell.platform_data = &i2c_info[i]; + cell.pdata_size = sizeof(i2c_info[i]); + + if (i < ARRAY_SIZE(ljca_acpi_match_i2cs)) + cell.acpi_match = &ljca_acpi_match_i2cs[i]; + + ret = ljca_add_mfd_cell(dev, &cell); + if (ret) + return ret; + } + + return 0; +} + +static int ljca_mng_enum_i2c(struct ljca_stub *stub) +{ + struct ljca_dev *dev = usb_get_intfdata(stub->intf); + char buf[LJCA_MAX_PAYLOAD_SIZE]; + struct ljca_i2c_descriptor *desc; + unsigned int len = LJCA_MAX_PAYLOAD_SIZE; + int ret; + + ret = ljca_stub_write(stub, LJCA_MNG_ENUM_I2C, NULL, 0, buf, &len, true, + LJCA_USB_ENUM_STUB_TIMEOUT_MS); + if (ret) { + dev_err(&stub->intf->dev, "I2C enumeration failed, ret:%d len:%u\n", ret, len); + return ret; + } + + desc = (struct ljca_i2c_descriptor *)buf; + return ljca_i2c_stub_init(dev, desc); +} + +static int ljca_spi_stub_init(struct ljca_dev *dev, struct ljca_spi_descriptor *desc) +{ + struct ljca_spi_info *spi_info; + struct ljca_stub *stub; + int i; + int ret; + + stub = ljca_stub_alloc(dev, LJCA_SPI_STUB, size_mul(desc->num, sizeof(*spi_info))); + if (IS_ERR(stub)) + return PTR_ERR(stub); + + spi_info = ljca_priv(stub); + for (i = 0; i < desc->num; i++) { + struct mfd_cell cell = {}; + + spi_info[i].ljca = &stub->ljca; + spi_info[i].id = desc->info[i].id; + spi_info[i].capacity = desc->info[i].capacity; + + cell.name = "ljca-spi"; + cell.platform_data = &spi_info[i]; + cell.pdata_size = sizeof(spi_info[i]); + if (i < ARRAY_SIZE(ljca_acpi_match_spis)) + cell.acpi_match = &ljca_acpi_match_spis[i]; + + ret = ljca_add_mfd_cell(dev, &cell); + if (ret) + return ret; + } + + return 0; +} + +static int ljca_mng_enum_spi(struct ljca_stub *stub) +{ + struct ljca_dev *dev = usb_get_intfdata(stub->intf); + char buf[LJCA_MAX_PAYLOAD_SIZE]; + struct ljca_spi_descriptor *desc; + unsigned int len = LJCA_MAX_PAYLOAD_SIZE; + int ret; + + ret = ljca_stub_write(stub, LJCA_MNG_ENUM_SPI, NULL, 0, buf, &len, true, + LJCA_USB_ENUM_STUB_TIMEOUT_MS); + if (ret) { + dev_err(&stub->intf->dev, "SPI enumeration failed, ret:%d len:%d\n", ret, len); + return ret; + } + + desc = (struct ljca_spi_descriptor *)buf; + return ljca_spi_stub_init(dev, desc); +} + +static int ljca_mng_get_version(struct ljca_stub *stub, char *buf) +{ + struct fw_version version = {}; + unsigned int len = sizeof(version); + int ret; + + ret = ljca_stub_write(stub, LJCA_MNG_GET_VERSION, NULL, 0, &version, &len, true, + LJCA_USB_WRITE_ACK_TIMEOUT_MS); + if (ret) + return ret; + + if (len != sizeof(version)) { + dev_err(&stub->intf->dev, "get version failed, len:%d\n", len); + return -EINVAL; + } + + return sysfs_emit(buf, "%d.%d.%d.%d\n", version.major, version.minor, + le16_to_cpu(version.patch), le16_to_cpu(version.build)); +} + +static inline int ljca_mng_set_dfu_mode(struct ljca_stub *stub) +{ + return ljca_stub_write(stub, LJCA_MNG_SET_DFU_MODE, NULL, 0, NULL, NULL, true, + LJCA_USB_WRITE_ACK_TIMEOUT_MS); +} + +static int ljca_mng_link(struct ljca_dev *dev, struct ljca_stub *stub) +{ + int ret; + + ret = ljca_mng_reset_handshake(stub); + if (ret) + return ret; + + /* try to enum all the stubs */ + ljca_mng_enum_gpio(stub); + ljca_mng_enum_i2c(stub); + ljca_mng_enum_spi(stub); + + return 0; +} + +static int ljca_mng_init(struct ljca_dev *dev) +{ + struct ljca_stub *stub; + struct ljca_mng_priv *priv; + int ret; + + stub = ljca_stub_alloc(dev, LJCA_MNG_STUB, sizeof(*priv)); + if (IS_ERR(stub)) + return PTR_ERR(stub); + + priv = ljca_priv(stub); + if (!priv) + return -ENOMEM; + + priv->reset_id = 0; + + ret = ljca_mng_link(dev, stub); + if (ret) + dev_err(&dev->intf->dev, "mng stub link failed, ret:%d\n", ret); + + return ret; +} + +static inline int ljca_diag_set_trace_level(struct ljca_stub *stub, u8 level) +{ + return ljca_stub_write(stub, LJCA_DIAG_SET_TRACE_LEVEL, &level, sizeof(level), NULL, NULL, + true, LJCA_USB_WRITE_ACK_TIMEOUT_MS); +} + +static int ljca_diag_init(struct ljca_dev *dev) +{ + struct ljca_stub *stub; + + stub = ljca_stub_alloc(dev, LJCA_DIAG_STUB, 0); + + return PTR_ERR_OR_ZERO(stub); +} + +static void ljca_delete(struct ljca_dev *dev) +{ + mutex_destroy(&dev->mutex); + usb_free_urb(dev->in_urb); + usb_put_intf(dev->intf); + usb_put_dev(dev->udev); + kfree(dev->ibuf); + kfree(dev->cells); + kfree(dev); +} + +static int ljca_init(struct ljca_dev *dev) +{ + mutex_init(&dev->mutex); + init_waitqueue_head(&dev->ack_wq); + INIT_LIST_HEAD(&dev->stubs_list); + + return 0; +} + +static void ljca_stop(struct ljca_dev *dev) +{ + dev->started = false; + usb_kill_urb(dev->in_urb); +} + +static ssize_t cmd_store(struct device *dev, struct device_attribute *attr, const char *buf, + size_t count) +{ + struct usb_interface *intf = to_usb_interface(dev); + struct ljca_dev *ljca_dev = usb_get_intfdata(intf); + struct ljca_stub *mng_stub = ljca_stub_find(ljca_dev, LJCA_MNG_STUB); + struct ljca_stub *diag_stub = ljca_stub_find(ljca_dev, LJCA_DIAG_STUB); + + if (sysfs_streq(buf, "dfu")) + ljca_mng_set_dfu_mode(mng_stub); + else if (sysfs_streq(buf, "debug")) + ljca_diag_set_trace_level(diag_stub, 3); + + return count; +} + +static ssize_t cmd_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + return sysfs_emit(buf, "%s\n", "supported cmd: [dfu, debug]"); +} +static DEVICE_ATTR_RW(cmd); + +static ssize_t version_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct usb_interface *intf = to_usb_interface(dev); + struct ljca_dev *ljca_dev = usb_get_intfdata(intf); + struct ljca_stub *stub = ljca_stub_find(ljca_dev, LJCA_MNG_STUB); + + return ljca_mng_get_version(stub, buf); +} +static DEVICE_ATTR_RO(version); + +static struct attribute *ljca_attrs[] = { + &dev_attr_version.attr, + &dev_attr_cmd.attr, + NULL +}; +ATTRIBUTE_GROUPS(ljca); + +static int ljca_probe(struct usb_interface *intf, const struct usb_device_id *id) +{ + struct ljca_dev *dev; + struct usb_endpoint_descriptor *bulk_in, *bulk_out; + int ret; + + /* allocate memory for our device state and initialize it */ + dev = kzalloc(sizeof(*dev), GFP_KERNEL); + if (!dev) + return -ENOMEM; + + ljca_init(dev); + dev->udev = usb_get_dev(interface_to_usbdev(intf)); + dev->intf = usb_get_intf(intf); + + /* set up the endpoint information use only the first bulk-in and bulk-out endpoints */ + ret = usb_find_common_endpoints(intf->cur_altsetting, &bulk_in, &bulk_out, NULL, NULL); + if (ret) { + dev_err(&intf->dev, "could not find both bulk-in and bulk-out endpoints\n"); + goto error; + } + + dev->ibuf_len = usb_endpoint_maxp(bulk_in); + dev->in_ep = bulk_in->bEndpointAddress; + dev->ibuf = kzalloc(dev->ibuf_len, GFP_KERNEL); + if (!dev->ibuf) { + ret = -ENOMEM; + goto error; + } + + dev->in_urb = usb_alloc_urb(0, GFP_KERNEL); + if (!dev->in_urb) { + ret = -ENOMEM; + goto error; + } + + dev->out_ep = bulk_out->bEndpointAddress; + /* save our data pointer in this intf device */ + usb_set_intfdata(intf, dev); + ret = ljca_start(dev); + if (ret) { + dev_err(&intf->dev, "bridge read start failed ret %d\n", ret); + goto error; + } + + ret = ljca_mng_init(dev); + if (ret) { + dev_err(&intf->dev, "register mng stub failed ret %d\n", ret); + goto error_stop; + } + + ret = ljca_diag_init(dev); + if (ret) { + dev_err(&intf->dev, "register diag stub failed ret %d\n", ret); + goto error_stop; + } + + ret = mfd_add_hotplug_devices(&intf->dev, dev->cells, dev->cell_count); + if (ret) { + dev_err(&intf->dev, "failed to add mfd devices\n"); + goto error_stop; + } + + usb_enable_autosuspend(dev->udev); + return 0; +error_stop: + ljca_stop(dev); +error: + dev_err(&intf->dev, "LJCA USB device init failed\n"); + /* this frees allocated memory */ + ljca_stub_cleanup(dev); + ljca_delete(dev); + return ret; +} + +static void ljca_disconnect(struct usb_interface *intf) +{ + struct ljca_dev *dev = usb_get_intfdata(intf); + + ljca_stop(dev); + mfd_remove_devices(&intf->dev); + ljca_stub_cleanup(dev); + ljca_delete(dev); +} + +static int ljca_suspend(struct usb_interface *intf, pm_message_t message) +{ + struct ljca_dev *dev = usb_get_intfdata(intf); + + ljca_stop(dev); + return 0; +} + +static int ljca_resume(struct usb_interface *intf) +{ + struct ljca_dev *dev = usb_get_intfdata(intf); + + return ljca_start(dev); +} + +static const struct usb_device_id ljca_table[] = { + {USB_DEVICE(0x8086, 0x0b63)}, + {} +}; +MODULE_DEVICE_TABLE(usb, ljca_table); + +static struct usb_driver ljca_driver = { + .name = "ljca", + .probe = ljca_probe, + .disconnect = ljca_disconnect, + .suspend = ljca_suspend, + .resume = ljca_resume, + .id_table = ljca_table, + .dev_groups = ljca_groups, + .supports_autosuspend = 1, +}; +module_usb_driver(ljca_driver); + +MODULE_AUTHOR("Ye Xiang <xiang.ye@intel.com>"); +MODULE_AUTHOR("Wang Zhifeng <zhifeng.wang@intel.com>"); +MODULE_AUTHOR("Zhang Lixu <lixu.zhang@intel.com>"); +MODULE_DESCRIPTION("Intel La Jolla Cove Adapter USB driver"); +MODULE_LICENSE("GPL"); diff --git a/include/linux/mfd/ljca.h b/include/linux/mfd/ljca.h new file mode 100644 index 000000000000..9ae3ea242294 --- /dev/null +++ b/include/linux/mfd/ljca.h @@ -0,0 +1,95 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +#ifndef _LINUX_USB_LJCA_H_ +#define _LINUX_USB_LJCA_H_ + +#include <linux/types.h> + +struct ljca; + +#define LJCA_MAX_GPIO_NUM 64 +struct ljca_gpio_info { + struct ljca *ljca; + unsigned int num; + DECLARE_BITMAP(valid_pin_map, LJCA_MAX_GPIO_NUM); +}; + +struct ljca_i2c_info { + struct ljca *ljca; + u8 id; + u8 capacity; + u8 intr_pin; +}; + +struct ljca_spi_info { + struct ljca *ljca; + u8 id; + u8 capacity; +}; + +/** + * typedef ljca_event_cb_t - event callback function signature + * + * @context: the execution context of who registered this callback + * @cmd: the command from device for this event + * @evt_data: the event data payload + * @len: the event data payload length + * + * The callback function is called in interrupt context and the data payload is + * only valid during the call. If the user needs later access of the data, it + * must copy it. + */ +typedef void (*ljca_event_cb_t)(void *context, u8 cmd, const void *evt_data, int len); + +/** + * ljca_register_event_cb - register a callback function to receive events + * + * @ljca: ljca device handle + * @event_cb: callback function + * @context: execution context of event callback + * + * Return: 0 in case of success, negative value in case of error + */ +int ljca_register_event_cb(struct ljca *ljca, ljca_event_cb_t event_cb, void *context); + +/** + * ljca_unregister_event_cb - unregister the callback function for an event + * + * @ljca: ljca device handle + */ +void ljca_unregister_event_cb(struct ljca *ljca); + +/** + * ljca_transfer - issue a LJCA command and wait for a response and the + * associated data + * + * @ljca: ljca device handle + * @cmd: the command to be sent to the device + * @obuf: the buffer to be sent to the device; it can be NULL if the user + * doesn't need to transmit data with this command + * @obuf_len: the size of the buffer to be sent to the device; it should + * be 0 when obuf is NULL + * @ibuf: any data associated with the response will be copied here; it can be + * NULL if the user doesn't need the response data + * @ibuf_len: must be initialized to the input buffer size; it will be modified + * to indicate the actual data transferred; it shouldn't be NULL as well + * when ibuf isn't NULL + * + * Return: 0 for success, negative value for errors + */ +int ljca_transfer(struct ljca *ljca, u8 cmd, const void *obuf, unsigned int obuf_len, + void *ibuf, unsigned int *ibuf_len); + +/** + * ljca_transfer_noack - issue a LJCA command without a response + * + * @ljca: ljca device handle + * @cmd: the command to be sent to the device + * @obuf: the buffer to be sent to the device; it can be NULL if the user + * doesn't need to transmit data with this command + * @obuf_len: the size of the buffer to be sent to the device + * + * Return: 0 for success, negative value for errors + */ +int ljca_transfer_noack(struct ljca *ljca, u8 cmd, const void *obuf, unsigned int obuf_len); + +#endif

[v4,1/5] mfd: Add support for Intel LJCA device

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