[PATCH v3 7/8] mikrobus: Add mikrobus driver

Ayush Singh
2024-03-15T18:50:35Z

- Setup I2C, SPI, serdev controllers associated with mikrobus connector
- Check if a board with valid mikroBUS manifest is connected
- Parse the manifest and register the device to kernel

Signed-off-by: Vaishnav M A <vaishnav@beagleboard.org>
Signed-off-by: Ayush Singh <ayushdevel1325@gmail.com>
---
MAINTAINERS | 1 +
drivers/misc/Kconfig | 1 +
drivers/misc/Makefile | 1 +
drivers/misc/mikrobus/Kconfig | 19 +
drivers/misc/mikrobus/Makefile | 6 +
drivers/misc/mikrobus/mikrobus_core.c | 942 ++++++++++++++++++++++
drivers/misc/mikrobus/mikrobus_core.h | 201 +++++
drivers/misc/mikrobus/mikrobus_id.c | 229 ++++++
drivers/misc/mikrobus/mikrobus_manifest.c | 502 ++++++++++++
drivers/misc/mikrobus/mikrobus_manifest.h | 20 +
10 files changed, 1922 insertions(+)
create mode 100644 drivers/misc/mikrobus/Kconfig
create mode 100644 drivers/misc/mikrobus/Makefile
create mode 100644 drivers/misc/mikrobus/mikrobus_core.c
create mode 100644 drivers/misc/mikrobus/mikrobus_core.h
create mode 100644 drivers/misc/mikrobus/mikrobus_id.c
create mode 100644 drivers/misc/mikrobus/mikrobus_manifest.c
create mode 100644 drivers/misc/mikrobus/mikrobus_manifest.h

diff --git a/MAINTAINERS b/MAINTAINERS
index 69418a058c6b..83bc5e48bef9 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -14772,6 +14772,7 @@ M: Ayush Singh <ayushdevel1325@gmail.com>
M: Vaishnav M A <vaishnav@beagleboard.org>
S: Maintained
F: Documentation/devicetree/bindings/misc/mikrobus-connector.yaml
+F: drivers/misc/mikrobus/*

MIKROTIK CRS3XX 98DX3236 BOARD SUPPORT
M: Luka Kovacic <luka.kovacic@sartura.hr>
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 4fb291f0bf7c..3d5c36205c6c 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -591,4 +591,5 @@ source "drivers/misc/cardreader/Kconfig"
source "drivers/misc/uacce/Kconfig"
source "drivers/misc/pvpanic/Kconfig"
source "drivers/misc/mchp_pci1xxxx/Kconfig"
+source "drivers/misc/mikrobus/Kconfig"
endmenu
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index ea6ea5bbbc9c..b9ac88055b87 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -68,3 +68,4 @@ obj-$(CONFIG_TMR_INJECT) += xilinx_tmr_inject.o
obj-$(CONFIG_TPS6594_ESM) += tps6594-esm.o
obj-$(CONFIG_TPS6594_PFSM) += tps6594-pfsm.o
obj-$(CONFIG_NSM) += nsm.o
+obj-y += mikrobus/
diff --git a/drivers/misc/mikrobus/Kconfig b/drivers/misc/mikrobus/Kconfig
new file mode 100644
index 000000000000..f0770006b4fe
--- /dev/null
+++ b/drivers/misc/mikrobus/Kconfig
@@ -0,0 +1,19 @@
+menuconfig MIKROBUS
+ tristate "Module for instantiating devices on mikroBUS ports"
+ depends on GPIOLIB
+ depends on W1
+ depends on W1_MASTER_GPIO
+ help
+ This option enables the mikroBUS driver. mikroBUS is an add-on
+ board socket standard that offers maximum expandability with
+ the smallest number of pins. The mikroBUS driver instantiates
+ devices on a mikroBUS port described by identifying data present
+ in an add-on board resident EEPROM, more details on the mikroBUS
+ driver support and discussion can be found in this eLinux wiki :
+ elinux.org/Mikrobus
+
+
+ Say Y here to enable support for this driver.
+
+ To compile this code as a module, chose M here: the module
+ will be called mikrobus.ko
diff --git a/drivers/misc/mikrobus/Makefile b/drivers/misc/mikrobus/Makefile
new file mode 100644
index 000000000000..c89ff2abb80e
--- /dev/null
+++ b/drivers/misc/mikrobus/Makefile
@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0
+# mikroBUS Core
+
+obj-$(CONFIG_MIKROBUS) += mikrobus.o
+mikrobus-y := mikrobus_core.o mikrobus_manifest.o
+obj-$(CONFIG_MIKROBUS) += mikrobus_id.o
diff --git a/drivers/misc/mikrobus/mikrobus_core.c b/drivers/misc/mikrobus/mikrobus_core.c
new file mode 100644
index 000000000000..17718ed315b9
--- /dev/null
+++ b/drivers/misc/mikrobus/mikrobus_core.c
@@ -0,0 +1,942 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * mikroBUS driver for instantiating add-on
+ * board devices with an identifier EEPROM
+ *
+ * Copyright 2020 Vaishnav M A, BeagleBoard.org Foundation.
+ * Copyright 2024 Ayush Singh <ayushdevel1325@gmail.com>
+ */
+
+#define pr_fmt(fmt) "mikrobus:%s: " fmt, __func__
+
+#include <linux/err.h>
+#include <linux/errno.h>
+#include <linux/idr.h>
+#include <linux/init.h>
+#include <linux/jump_label.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/gpio/consumer.h>
+#include <linux/mutex.h>
+#include <linux/w1.h>
+#include <linux/device.h>
+#include <linux/i2c.h>
+#include <linux/gpio.h>
+#include <linux/gpio/machine.h>
+#include <linux/gpio/driver.h>
+#include <linux/nvmem-consumer.h>
+#include <linux/nvmem-provider.h>
+#include <linux/interrupt.h>
+#include <linux/spi/spi.h>
+#include <linux/serdev.h>
+#include <linux/property.h>
+#include <linux/platform_device.h>
+#include <linux/debugfs.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/regulator/fixed.h>
+#include <linux/regulator/machine.h>
+#include <linux/clk-provider.h>
+#include <linux/greybus/greybus_manifest.h>
+#include <linux/of_platform.h>
+#include <linux/pwm.h>
+
+#include "mikrobus_core.h"
+#include "mikrobus_manifest.h"
+
+#define MIKROBUS_ID_EEPROM_MANIFEST_ADDR 0x20
+
+static DEFINE_MUTEX(core_lock);
+static DEFINE_IDR(mikrobus_port_idr);
+static struct class_compat *mikrobus_port_compat_class;
+int __mikrobus_first_dynamic_bus_num;
+static bool is_registered;
+static int mikrobus_port_id_eeprom_probe(struct mikrobus_port *port);
+
+const char *MIKROBUS_PINCTRL_STR[] = { "pwm", "uart", "i2c", "spi" };
+
+const struct bus_type mikrobus_bus_type = {
+ .name = "mikrobus",
+};
+EXPORT_SYMBOL_GPL(mikrobus_bus_type);
+
+int mikrobus_port_scan_eeprom(struct mikrobus_port *port)
+{
+ const u16 manifest_start_addr = MIKROBUS_ID_EEPROM_MANIFEST_ADDR;
+ struct addon_board_info *board;
+ int manifest_size, retval;
+ char header[12], *buf;
+
+ if (port->skip_scan)
+ return -EINVAL;
+
+ retval = nvmem_device_read(port->eeprom, manifest_start_addr, 12, header);
+ if (retval != 12) {
+ return dev_err_probe(&port->dev, -EINVAL, "failed to fetch manifest header %d\n",
+ retval);
+ }
+
+ manifest_size = mikrobus_manifest_header_validate(header, 12);
+ if (manifest_size < 0) {
+ return dev_err_probe(&port->dev, -EINVAL, "invalid manifest size %d\n",
+ manifest_size);
+ }
+
+ buf = kzalloc(manifest_size, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ retval = nvmem_device_read(port->eeprom, manifest_start_addr, manifest_size, buf);
+ if (retval != manifest_size) {
+ retval =
+ dev_err_probe(&port->dev, -EINVAL, "failed to fetch manifest %d\n", retval);
+ goto err_free_buf;
+ }
+
+ board = kzalloc(sizeof(*board), GFP_KERNEL);
+ if (!board) {
+ retval = -ENOMEM;
+ goto err_free_buf;
+ }
+
+ w1_reset_bus(port->w1_master);
+ /* set RST HIGH */
+ gpiod_direction_output(port->gpios->desc[MIKROBUS_PIN_RST], 1);
+ set_bit(W1_ABORT_SEARCH, &port->w1_master->flags);
+
+ INIT_LIST_HEAD(&board->manifest_descs);
+ INIT_LIST_HEAD(&board->devices);
+ retval = mikrobus_manifest_parse(board, buf, manifest_size);
+ if (!retval) {
+ retval = dev_err_probe(&port->dev, -EINVAL, "failed to parse manifest, size %d\n",
+ manifest_size);
+ goto err_free_board;
+ }
+
+ retval = mikrobus_board_register(port, board);
+ if (retval) {
+ dev_err(&port->dev, "failed to register board %s\n", board->name);
+ goto err_free_board;
+ }
+
+ kfree(buf);
+ return 0;
+
+err_free_board:
+ kfree(board);
+err_free_buf:
+ kfree(buf);
+ return retval;
+}
+EXPORT_SYMBOL_GPL(mikrobus_port_scan_eeprom);
+
+static ssize_t name_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ return sprintf(buf, "%s\n", to_mikrobus_port(dev)->name);
+}
+static DEVICE_ATTR_RO(name);
+
+static ssize_t new_device_store(struct device *dev, struct device_attribute *attr, const char *buf,
+ size_t count)
+{
+ struct mikrobus_port *port = to_mikrobus_port(dev);
+ struct addon_board_info *board;
+ int retval;
+
+ if (port->board)
+ return dev_err_probe(dev, -EBUSY, "already has board registered\n");
+
+ board = kzalloc(sizeof(*board), GFP_KERNEL);
+ if (!board)
+ return -ENOMEM;
+
+ INIT_LIST_HEAD(&board->manifest_descs);
+ INIT_LIST_HEAD(&board->devices);
+ retval = mikrobus_manifest_parse(board, (void *)buf, count);
+ if (!retval) {
+ retval = dev_err_probe(dev, -EINVAL, "failed to parse manifest\n");
+ goto err_free_board;
+ }
+
+ retval = mikrobus_board_register(port, board);
+ if (retval) {
+ retval = dev_err_probe(dev, -EINVAL, "failed to register board %s\n", board->name);
+ goto err_free_board;
+ }
+
+ return count;
+
+err_free_board:
+ kfree(board);
+ return retval;
+}
+static DEVICE_ATTR_WO(new_device);
+
+static ssize_t delete_device_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct mikrobus_port *port = to_mikrobus_port(dev);
+ unsigned long id;
+
+ if (kstrtoul(buf, 0, &id))
+ return dev_err_probe(dev, -EINVAL, "cannot parse board id");
+
+ if (!port->board)
+ return dev_err_probe(dev, -ENODEV, "does not have registered boards");
+
+ mikrobus_board_unregister(port, port->board);
+ return count;
+}
+static DEVICE_ATTR_IGNORE_LOCKDEP(delete_device, 0200, NULL, delete_device_store);
+
+static struct attribute *mikrobus_port_attrs[] = { &dev_attr_new_device.attr,
+ &dev_attr_delete_device.attr,
+ &dev_attr_name.attr, NULL };
+ATTRIBUTE_GROUPS(mikrobus_port);
+
+static void mikrobus_port_release(struct device *dev)
+{
+ struct mikrobus_port *port = to_mikrobus_port(dev);
+
+ mutex_lock(&core_lock);
+ idr_remove(&mikrobus_port_idr, port->id);
+ mutex_unlock(&core_lock);
+
+ kfree(port);
+}
+
+const struct device_type mikrobus_port_type = {
+ .groups = mikrobus_port_groups,
+ .release = mikrobus_port_release,
+};
+EXPORT_SYMBOL_GPL(mikrobus_port_type);
+
+static int mikrobus_w1_master_match(struct device *dev, const void *data)
+{
+ struct mikrobus_port *port;
+
+ if (dev->type != &mikrobus_port_type)
+ return 0;
+
+ port = to_mikrobus_port(dev);
+
+ return port->w1_master == data;
+}
+
+struct mikrobus_port *mikrobus_find_port_by_w1_master(struct w1_master *master)
+{
+ struct device *dev;
+
+ dev = bus_find_device(&mikrobus_bus_type, NULL, master, mikrobus_w1_master_match);
+ if (!dev)
+ return NULL;
+
+ return (dev->type == &mikrobus_port_type) ? to_mikrobus_port(dev) : NULL;
+}
+EXPORT_SYMBOL(mikrobus_find_port_by_w1_master);
+
+int mikrobus_port_pinctrl_select(struct mikrobus_port *port)
+{
+ struct pinctrl_state *state;
+ int retval, i;
+
+ for (i = 0; i < MIKROBUS_NUM_PINCTRL_STATE; i++) {
+ state = pinctrl_lookup_state(port->pinctrl, port->pinctrl_selected[i]);
+ if (!IS_ERR(state)) {
+ retval = pinctrl_select_state(port->pinctrl, state);
+ if (retval) {
+ return dev_err_probe(&port->dev, retval,
+ "failed to select state %s\n",
+ port->pinctrl_selected[i]);
+ }
+ dev_dbg(&port->dev, "setting pinctrl %s\n", port->pinctrl_selected[i]);
+ } else {
+ return dev_err_probe(&port->dev, PTR_ERR(state),
+ "failed to find state %s\n",
+ port->pinctrl_selected[i]);
+ }
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(mikrobus_port_pinctrl_select);
+
+static int mikrobus_port_pinctrl_setup(struct mikrobus_port *port, struct addon_board_info *board)
+{
+ int retval;
+
+ if (board->pin_state[MIKROBUS_PIN_PWM] == MIKROBUS_STATE_PWM)
+ sprintf(port->pinctrl_selected[MIKROBUS_PINCTRL_PWM], "%s_%s",
+ MIKROBUS_PINCTRL_STR[MIKROBUS_PINCTRL_PWM], PINCTRL_STATE_DEFAULT);
+ else
+ sprintf(port->pinctrl_selected[MIKROBUS_PINCTRL_PWM], "%s_%s",
+ MIKROBUS_PINCTRL_STR[MIKROBUS_PINCTRL_PWM], MIKROBUS_PINCTRL_STATE_GPIO);
+
+ if (board->pin_state[MIKROBUS_PIN_RX] == MIKROBUS_STATE_UART)
+ sprintf(port->pinctrl_selected[MIKROBUS_PINCTRL_UART], "%s_%s",
+ MIKROBUS_PINCTRL_STR[MIKROBUS_PINCTRL_UART], PINCTRL_STATE_DEFAULT);
+ else
+ sprintf(port->pinctrl_selected[MIKROBUS_PINCTRL_UART], "%s_%s",
+ MIKROBUS_PINCTRL_STR[MIKROBUS_PINCTRL_UART], MIKROBUS_PINCTRL_STATE_GPIO);
+
+ if (board->pin_state[MIKROBUS_PIN_SCL] == MIKROBUS_STATE_I2C)
+ sprintf(port->pinctrl_selected[MIKROBUS_PINCTRL_I2C], "%s_%s",
+ MIKROBUS_PINCTRL_STR[MIKROBUS_PINCTRL_I2C], PINCTRL_STATE_DEFAULT);
+ else
+ sprintf(port->pinctrl_selected[MIKROBUS_PINCTRL_I2C], "%s_%s",
+ MIKROBUS_PINCTRL_STR[MIKROBUS_PINCTRL_I2C], MIKROBUS_PINCTRL_STATE_GPIO);
+
+ if (board->pin_state[MIKROBUS_PIN_MOSI] == MIKROBUS_STATE_SPI)
+ sprintf(port->pinctrl_selected[MIKROBUS_PINCTRL_SPI], "%s_%s",
+ MIKROBUS_PINCTRL_STR[MIKROBUS_PINCTRL_SPI], PINCTRL_STATE_DEFAULT);
+ else
+ sprintf(port->pinctrl_selected[MIKROBUS_PINCTRL_SPI], "%s_%s",
+ MIKROBUS_PINCTRL_STR[MIKROBUS_PINCTRL_SPI], MIKROBUS_PINCTRL_STATE_GPIO);
+
+ retval = mikrobus_port_pinctrl_select(port);
+ if (retval)
+ dev_err(&port->dev, "failed to select pinctrl states [%d]", retval);
+
+ return retval;
+}
+
+static int mikrobus_irq_get(struct mikrobus_port *port, int irqno, int irq_type)
+{
+ int irq;
+
+ if (irqno > port->gpios->ndescs - 1)
+ return dev_err_probe(&port->dev, -ENODEV, "GPIO %d does not exist", irqno);
+
+ irq = gpiod_to_irq(port->gpios->desc[irqno]);
+ if (irq < 0)
+ return dev_err_probe(&port->dev, -EINVAL, "could not get irq %d", irqno);
+
+ irq_set_irq_type(irq, irq_type);
+
+ return irq;
+}
+
+static int mikrobus_gpio_setup(struct gpio_desc *gpio, int gpio_state)
+{
+ switch (gpio_state) {
+ case MIKROBUS_STATE_INPUT:
+ return gpiod_direction_input(gpio);
+ case MIKROBUS_STATE_OUTPUT_HIGH:
+ return gpiod_direction_output(gpio, 1);
+ case MIKROBUS_STATE_OUTPUT_LOW:
+ return gpiod_direction_output(gpio, 0);
+ case MIKROBUS_STATE_PWM:
+ case MIKROBUS_STATE_SPI:
+ case MIKROBUS_STATE_I2C:
+ default:
+ return 0;
+ }
+}
+
+static char *mikrobus_gpio_chip_name_get(struct mikrobus_port *port, int gpio)
+{
+ struct gpio_chip *gpiochip;
+
+ if (gpio > port->gpios->ndescs - 1)
+ return NULL;
+
+ gpiochip = gpiod_to_chip(port->gpios->desc[gpio]);
+ return kmemdup(gpiochip->label, MIKROBUS_NAME_SIZE, GFP_KERNEL);
+}
+
+static int mikrobus_gpio_hwnum_get(struct mikrobus_port *port, int gpio)
+{
+ struct gpio_chip *gpiochip;
+
+ if (gpio > port->gpios->ndescs - 1)
+ return -ENODEV;
+
+ gpiochip = gpiod_to_chip(port->gpios->desc[gpio]);
+ return desc_to_gpio(port->gpios->desc[gpio]) - gpiochip->base;
+}
+
+static void mikrobus_board_device_release_all(struct addon_board_info *info)
+{
+ struct board_device_info *dev, *next;
+
+ list_for_each_entry_safe(dev, next, &info->devices, links) {
+ list_del(&dev->links);
+ kfree(dev);
+ }
+}
+
+static int mikrobus_device_register(struct mikrobus_port *port, struct board_device_info *dev,
+ char *board_name)
+{
+ struct regulator_consumer_supply regulator;
+ struct gpiod_lookup_table *lookup;
+ char devname[MIKROBUS_NAME_SIZE];
+ struct spi_board_info *spi_info;
+ struct i2c_board_info *i2c_info;
+ struct serdev_device *serdev;
+ struct platform_device *pdev;
+ struct fwnode_handle *fwnode;
+ struct spi_device *spi;
+ int i, retval;
+ u64 *val;
+
+ dev_info(&port->dev, "registering device : %s", dev->drv_name);
+
+ if (dev->gpio_lookup) {
+ lookup = dev->gpio_lookup;
+
+ switch (dev->protocol) {
+ case GREYBUS_PROTOCOL_SPI:
+ snprintf(devname, sizeof(devname), "%s.%u", dev_name(&port->spi_ctrl->dev),
+ port->chip_select[dev->reg]);
+ lookup->dev_id = kmemdup(devname, MIKROBUS_NAME_SIZE, GFP_KERNEL);
+ break;
+ case GREYBUS_PROTOCOL_RAW:
+ snprintf(devname, sizeof(devname), "%s.%u", dev->drv_name, dev->reg);
+ lookup->dev_id = kmemdup(devname, MIKROBUS_NAME_SIZE, GFP_KERNEL);
+ break;
+ default:
+ lookup->dev_id = dev->drv_name;
+ }
+
+ dev_info(&port->dev, "adding lookup table : %s", lookup->dev_id);
+
+ for (i = 0; i < dev->num_gpio_resources; i++) {
+ lookup->table[i].key =
+ mikrobus_gpio_chip_name_get(port, lookup->table[i].chip_hwnum);
+ lookup->table[i].chip_hwnum =
+ mikrobus_gpio_hwnum_get(port, lookup->table[i].chip_hwnum);
+ }
+
+ gpiod_add_lookup_table(lookup);
+ }
+
+ if (dev->regulators) {
+ if (dev->protocol == GREYBUS_PROTOCOL_SPI) {
+ snprintf(devname, sizeof(devname), "%s.%u", dev_name(&port->spi_ctrl->dev),
+ port->chip_select[dev->reg]);
+ regulator.dev_name = kmemdup(devname, MIKROBUS_NAME_SIZE, GFP_KERNEL);
+ } else if (dev->protocol == GREYBUS_PROTOCOL_RAW) {
+ snprintf(devname, sizeof(devname), "%s.%u", dev->drv_name, dev->reg);
+ regulator.dev_name = kmemdup(devname, MIKROBUS_NAME_SIZE, GFP_KERNEL);
+ } else {
+ regulator.dev_name = dev->drv_name;
+ }
+
+ for (i = 0; i < dev->num_regulators; i++) {
+ val = dev->regulators[i].value.u64_data;
+ regulator.supply =
+ kmemdup(dev->regulators[i].name, MIKROBUS_NAME_SIZE, GFP_KERNEL);
+ dev_info(&port->dev, "adding fixed regulator %llu uv, %s for %s", *val,
+ regulator.supply, regulator.dev_name);
+ regulator_register_always_on(0, dev->regulators[i].name, &regulator, 1,
+ *val);
+ }
+ }
+
+ switch (dev->protocol) {
+ case GREYBUS_PROTOCOL_SPI:
+ spi_info = kzalloc(sizeof(*spi_info), GFP_KERNEL);
+ strscpy_pad(spi_info->modalias, dev->drv_name, sizeof(spi_info->modalias) - 1);
+ if (dev->irq)
+ spi_info->irq = mikrobus_irq_get(port, dev->irq, dev->irq_type);
+ if (dev->properties) {
+ fwnode = fwnode_create_software_node(dev->properties, NULL);
+ spi_info->swnode = to_software_node(fwnode);
+ }
+ spi_info->chip_select = port->chip_select[dev->reg];
+ spi_info->max_speed_hz = dev->max_speed_hz;
+ spi_info->mode = dev->mode;
+
+ spi = spi_new_device(port->spi_ctrl, spi_info);
+ if (!spi)
+ return dev_err_probe(&port->dev, -ENOMEM, "failed to create spi device");
+
+ if (dev->clocks) {
+ for (i = 0; i < dev->num_clocks; i++) {
+ val = dev->clocks[i].value.u64_data;
+ dev_info(&port->dev, "adding fixed clock %s, %llu hz",
+ dev->clocks[i].name, *val);
+ clk_register_fixed_rate(&spi->dev, dev->clocks[i].name, devname, 0,
+ *val);
+ }
+ }
+
+ dev->dev_client = (void *)spi;
+ break;
+ case GREYBUS_PROTOCOL_I2C:
+ i2c_info = kzalloc(sizeof(*i2c_info), GFP_KERNEL);
+ if (!i2c_info)
+ return -ENOMEM;
+
+ strscpy_pad(i2c_info->type, dev->drv_name, sizeof(i2c_info->type) - 1);
+ if (dev->irq)
+ i2c_info->irq = mikrobus_irq_get(port, dev->irq, dev->irq_type);
+ if (dev->properties) {
+ fwnode = fwnode_create_software_node(dev->properties, NULL);
+ i2c_info->swnode = to_software_node(fwnode);
+ }
+ i2c_info->addr = dev->reg;
+ dev->dev_client = (void *)i2c_new_client_device(port->i2c_adap, i2c_info);
+ break;
+ case GREYBUS_PROTOCOL_RAW:
+ pdev = platform_device_alloc(dev->drv_name, 0);
+ if (!pdev)
+ return -ENOMEM;
+
+ if (dev->properties) {
+ retval = device_create_managed_software_node(&pdev->dev, dev->properties,
+ NULL);
+ if (retval)
+ return dev_err_probe(&port->dev, retval,
+ "failed to create software node");
+ }
+ dev->dev_client = pdev;
+ platform_device_add(dev->dev_client);
+ break;
+ case GREYBUS_PROTOCOL_UART:
+ serdev = serdev_device_alloc(port->ser_ctrl);
+ if (!serdev)
+ return -ENOMEM;
+
+ if (dev->properties)
+ device_create_managed_software_node(&serdev->dev, dev->properties, NULL);
+
+ dev->dev_client = serdev;
+ serdev_device_add(serdev);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static void mikrobus_device_unregister(struct mikrobus_port *port, struct board_device_info *dev,
+ char *board_name)
+{
+ dev_info(&port->dev, "removing device %s\n", dev->drv_name);
+ if (dev->gpio_lookup) {
+ gpiod_remove_lookup_table(dev->gpio_lookup);
+ kfree(dev->gpio_lookup);
+ }
+
+ kfree(dev->properties);
+
+ switch (dev->protocol) {
+ case GREYBUS_PROTOCOL_SPI:
+ spi_unregister_device((struct spi_device *)dev->dev_client);
+ break;
+ case GREYBUS_PROTOCOL_I2C:
+ i2c_unregister_device((struct i2c_client *)dev->dev_client);
+ break;
+ case GREYBUS_PROTOCOL_RAW:
+ platform_device_unregister((struct platform_device *)dev->dev_client);
+ break;
+ case GREYBUS_PROTOCOL_UART:
+ serdev_device_remove((struct serdev_device *)dev->dev_client);
+ break;
+ }
+}
+
+int mikrobus_board_register(struct mikrobus_port *port, struct addon_board_info *board)
+{
+ struct board_device_info *devinfo, *next;
+ int retval, i;
+
+ if (WARN_ON(list_empty(&board->devices)))
+ return false;
+
+ if (port->pinctrl) {
+ retval = mikrobus_port_pinctrl_setup(port, board);
+ if (retval)
+ dev_err(&port->dev, "failed to setup pinctrl state [%d]", retval);
+ }
+
+ if (port->gpios) {
+ for (i = 0; i < port->gpios->ndescs; i++) {
+ retval = mikrobus_gpio_setup(port->gpios->desc[i], board->pin_state[i]);
+ if (retval)
+ dev_err(&port->dev, "failed to setup gpio %d, state %d", i,
+ board->pin_state[i]);
+
+ gpiochip_free_own_desc(port->gpios->desc[i]);
+ }
+ }
+
+ list_for_each_entry_safe(devinfo, next, &board->devices, links)
+ mikrobus_device_register(port, devinfo, board->name);
+
+ port->board = board;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(mikrobus_board_register);
+
+void mikrobus_board_unregister(struct mikrobus_port *port, struct addon_board_info *board)
+{
+ struct board_device_info *devinfo, *next;
+
+ if (WARN_ON(list_empty(&board->devices)))
+ return;
+
+ list_for_each_entry_safe(devinfo, next, &board->devices, links)
+ mikrobus_device_unregister(port, devinfo, board->name);
+
+ mikrobus_board_device_release_all(board);
+ kfree(board);
+ port->board = NULL;
+}
+EXPORT_SYMBOL_GPL(mikrobus_board_unregister);
+
+static int mikrobus_port_id_eeprom_probe(struct mikrobus_port *port)
+{
+ static const char drvname[MIKROBUS_NAME_SIZE] = "w1-gpio\0";
+ struct platform_device *mikrobus_id_eeprom_w1_device;
+ struct gpiod_lookup_table *lookup;
+ char devname[MIKROBUS_NAME_SIZE];
+ struct w1_bus_master *bm;
+ int retval;
+
+ sprintf(port->pinctrl_selected[MIKROBUS_PINCTRL_SPI], "%s_%s",
+ MIKROBUS_PINCTRL_STR[MIKROBUS_PINCTRL_SPI], MIKROBUS_PINCTRL_STATE_GPIO);
+
+ retval = mikrobus_port_pinctrl_select(port);
+
+ /* set RST LOW */
+ gpiod_direction_output(port->gpios->desc[MIKROBUS_PIN_RST], 0);
+
+ lookup = kzalloc(struct_size(lookup, table, 1), GFP_KERNEL);
+ if (!lookup)
+ return -ENOMEM;
+
+ retval = snprintf(devname, sizeof(devname), "%s.%u", drvname, port->id);
+ lookup->dev_id = kmemdup(devname, retval + 1, GFP_KERNEL);
+ lookup->table[0].key = mikrobus_gpio_chip_name_get(port, MIKROBUS_PIN_CS);
+ lookup->table[0].flags = GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN;
+ lookup->table[0].chip_hwnum = mikrobus_gpio_hwnum_get(port, MIKROBUS_PIN_CS);
+
+ gpiochip_free_own_desc(port->gpios->desc[MIKROBUS_PIN_CS]);
+ gpiod_add_lookup_table(lookup);
+
+ mikrobus_id_eeprom_w1_device = platform_device_register_simple(drvname, port->id, NULL, 0);
+ if (IS_ERR(mikrobus_id_eeprom_w1_device)) {
+ retval = PTR_ERR(mikrobus_id_eeprom_w1_device);
+ dev_err(&port->dev, "failed to register w1-gpio device %d", retval);
+ goto early_exit;
+ }
+
+ port->w1_gpio = mikrobus_id_eeprom_w1_device;
+
+ bm = (struct w1_bus_master *)platform_get_drvdata(mikrobus_id_eeprom_w1_device);
+ if (!bm) {
+ dev_err(&port->dev, "failed to get w1_bus_master");
+ return 0;
+ }
+
+ port->w1_master = w1_find_master_device(bm);
+ if (!port->w1_master) {
+ dev_err(&port->dev, "failed to find W1 GPIO master, port [%s]", port->name);
+ goto early_exit;
+ }
+
+ port->w1_master->search_count = 4;
+
+ return 0;
+
+early_exit:
+ gpiod_remove_lookup_table(lookup);
+ kfree(lookup);
+ return -ENODEV;
+}
+
+int mikrobus_port_register(struct mikrobus_port *port)
+{
+ struct device *dev = &port->dev;
+ int retval, id;
+
+ if (WARN_ON(!is_registered))
+ return -EAGAIN;
+
+ if (dev->of_node) {
+ id = of_alias_get_id(dev->of_node, "mikrobus");
+ if (id >= 0) {
+ port->id = id;
+ mutex_lock(&core_lock);
+ id = idr_alloc(&mikrobus_port_idr, port, port->id, port->id + 1,
+ GFP_KERNEL);
+ mutex_unlock(&core_lock);
+ if (WARN(id < 0, "couldn't get idr"))
+ return id == -ENOSPC ? -EBUSY : id;
+ }
+ } else {
+ mutex_lock(&core_lock);
+ id = idr_alloc(&mikrobus_port_idr, port, __mikrobus_first_dynamic_bus_num, 0,
+ GFP_KERNEL);
+ mutex_unlock(&core_lock);
+ if (id < 0)
+ return id;
+
+ port->id = id;
+ }
+
+ port->dev.bus = &mikrobus_bus_type;
+ port->dev.type = &mikrobus_port_type;
+ strscpy_pad(port->name, "mikrobus-port", sizeof(port->name) - 1);
+ dev_set_name(&port->dev, "mikrobus-%d", port->id);
+ dev_info(&port->dev, "registering port mikrobus-%d ", port->id);
+
+ retval = device_register(&port->dev);
+ if (retval) {
+ dev_err(&port->dev, "port '%d': can't register device (%d)", port->id, retval);
+ put_device(&port->dev);
+ return retval;
+ }
+
+ retval = class_compat_create_link(mikrobus_port_compat_class, &port->dev, port->dev.parent);
+ if (retval)
+ dev_warn(&port->dev, "failed to create compatibility class link");
+
+ if (!port->w1_master) {
+ dev_info(&port->dev, "mikrobus port %d eeprom empty probing default eeprom",
+ port->id);
+ mutex_lock(&core_lock);
+ retval = mikrobus_port_id_eeprom_probe(port);
+ mutex_unlock(&core_lock);
+ }
+
+ return retval;
+}
+EXPORT_SYMBOL_GPL(mikrobus_port_register);
+
+void mikrobus_port_delete(struct mikrobus_port *port)
+{
+ struct mikrobus_port *found;
+
+ mutex_lock(&core_lock);
+ found = idr_find(&mikrobus_port_idr, port->id);
+ mutex_unlock(&core_lock);
+ if (found != port) {
+ pr_err("port [%s] not registered", port->name);
+ return;
+ }
+
+ if (port->board) {
+ dev_err(&port->dev, "attempting to delete port with registered boards, port [%s]\n",
+ port->name);
+ return;
+ }
+
+ if (port->eeprom) {
+ nvmem_device_put(port->eeprom);
+ platform_device_unregister(port->w1_gpio);
+ }
+
+ class_compat_remove_link(mikrobus_port_compat_class, &port->dev, port->dev.parent);
+ device_unregister(&port->dev);
+ mutex_lock(&core_lock);
+ idr_remove(&mikrobus_port_idr, port->id);
+ mutex_unlock(&core_lock);
+ memset(&port->dev, 0, sizeof(port->dev));
+}
+EXPORT_SYMBOL_GPL(mikrobus_port_delete);
+
+static int mikrobus_port_probe_pinctrl_setup(struct mikrobus_port *port)
+{
+ struct device *dev = port->dev.parent;
+ struct pinctrl_state *state;
+ int retval, i;
+
+ state = pinctrl_lookup_state(port->pinctrl, PINCTRL_STATE_DEFAULT);
+ if (!IS_ERR(state)) {
+ retval = pinctrl_select_state(port->pinctrl, state);
+ if (retval) {
+ return dev_err_probe(dev, retval, "Failed to select state %s\n",
+ PINCTRL_STATE_DEFAULT);
+ }
+ } else {
+ return dev_err_probe(dev, PTR_ERR(state), "failed to find state %s\n",
+ PINCTRL_STATE_DEFAULT);
+ }
+
+ for (i = 0; i < MIKROBUS_NUM_PINCTRL_STATE; i++) {
+ port->pinctrl_selected[i] = kmalloc(MIKROBUS_PINCTRL_NAME_SIZE, GFP_KERNEL);
+ sprintf(port->pinctrl_selected[i], "%s_%s", MIKROBUS_PINCTRL_STR[i],
+ PINCTRL_STATE_DEFAULT);
+ }
+
+ retval = mikrobus_port_pinctrl_select(port);
+ if (retval)
+ dev_err(dev, "failed to select pinctrl states [%d]", retval);
+
+ return retval;
+}
+
+static int mikrobus_port_probe(struct platform_device *pdev)
+{
+ struct device_node *i2c_adap_np, *uart_np, *spi_np;
+ struct device *dev = &pdev->dev;
+ struct mikrobus_port *port;
+ int retval;
+
+ port = kzalloc(sizeof(*port), GFP_KERNEL);
+ if (!port)
+ return -ENOMEM;
+
+ /* I2C setup */
+ i2c_adap_np = of_parse_phandle(dev->of_node, "i2c-adapter", 0);
+ if (!i2c_adap_np) {
+ retval = dev_err_probe(dev, -ENODEV, "cannot parse i2c-adapter");
+ goto err_port;
+ }
+ port->i2c_adap = of_find_i2c_adapter_by_node(i2c_adap_np);
+ of_node_put(i2c_adap_np);
+
+ /* GPIO setup */
+ port->gpios = gpiod_get_array(dev, "mikrobus", GPIOD_OUT_LOW);
+ if (IS_ERR(port->gpios)) {
+ retval = PTR_ERR(port->gpios);
+ dev_err(dev, "failed to get gpio array [%d]", retval);
+ goto err_port;
+ }
+
+ /* SPI setup */
+ spi_np = of_parse_phandle(dev->of_node, "spi-controller", 0);
+ if (!spi_np) {
+ retval = dev_err_probe(dev, -ENODEV, "cannot parse spi-controller");
+ goto err_port;
+ }
+ port->spi_ctrl = of_find_spi_controller_by_node(spi_np);
+ of_node_put(spi_np);
+ if (!port->spi_ctrl) {
+ retval = dev_err_probe(dev, -ENODEV, "cannot find spi controller");
+ goto err_port;
+ }
+ retval = device_property_read_u32_array(dev, "spi-cs", port->chip_select, MIKROBUS_NUM_CS);
+ if (retval) {
+ dev_err(dev, "failed to get spi-cs [%d]", retval);
+ goto err_port;
+ }
+
+ /* UART setup */
+ uart_np = of_parse_phandle(dev->of_node, "uart", 0);
+ if (!uart_np) {
+ retval = dev_err_probe(dev, -ENODEV, "cannot parse uart");
+ goto err_port;
+ }
+ port->ser_ctrl = of_find_serdev_controller_by_node(uart_np);
+ of_node_put(uart_np);
+ if (!port->ser_ctrl) {
+ retval = dev_err_probe(dev, -ENODEV, "cannot find uart controller");
+ goto err_port;
+ }
+
+ /* PWM setup */
+ port->pwm = devm_pwm_get(dev, NULL);
+ if (!port->pwm) {
+ retval = dev_err_probe(dev, -ENODEV, "cannot find pwm controller");
+ goto err_port;
+ }
+
+ /* pinctrl setup */
+ port->pinctrl = devm_pinctrl_get(dev);
+ if (IS_ERR(port->pinctrl)) {
+ retval = PTR_ERR(port->pinctrl);
+ dev_err(dev, "failed to get pinctrl [%d]", retval);
+ goto err_port;
+ }
+ port->dev.parent = dev;
+ port->dev.of_node = pdev->dev.of_node;
+ retval = mikrobus_port_probe_pinctrl_setup(port);
+ if (retval) {
+ dev_err(dev, "failed to setup pinctrl [%d]", retval);
+ goto err_port;
+ }
+
+ retval = mikrobus_port_register(port);
+ if (retval) {
+ dev_err(dev, "port : can't register port [%d]", retval);
+ goto err_port;
+ }
+
+ platform_set_drvdata(pdev, port);
+
+ return 0;
+
+err_port:
+ kfree(port);
+ return retval;
+}
+
+static int mikrobus_port_remove(struct platform_device *pdev)
+{
+ struct mikrobus_port *port = platform_get_drvdata(pdev);
+
+ mikrobus_port_delete(port);
+ return 0;
+}
+
+static const struct of_device_id mikrobus_port_of_match[] = {
+ { .compatible = "mikrobus-connector" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, mikrobus_port_of_match);
+
+static struct platform_driver mikrobus_port_driver = {
+ .probe = mikrobus_port_probe,
+ .remove = mikrobus_port_remove,
+ .driver = {
+ .name = "mikrobus",
+ .of_match_table = of_match_ptr(mikrobus_port_of_match),
+ },
+};
+
+static int mikrobus_init(void)
+{
+ int retval;
+
+ retval = bus_register(&mikrobus_bus_type);
+ if (retval) {
+ pr_err("bus_register failed (%d)\n", retval);
+ return retval;
+ }
+
+ mikrobus_port_compat_class = class_compat_register("mikrobus-port");
+ if (!mikrobus_port_compat_class) {
+ pr_err("class_compat register failed (%d)\n", retval);
+ retval = -ENOMEM;
+ goto class_err;
+ }
+
+ retval = of_alias_get_highest_id("mikrobus");
+ if (retval >= __mikrobus_first_dynamic_bus_num)
+ __mikrobus_first_dynamic_bus_num = retval + 1;
+
+ is_registered = true;
+ retval = platform_driver_register(&mikrobus_port_driver);
+ if (retval)
+ pr_err("driver register failed [%d]\n", retval);
+
+ return retval;
+
+class_err:
+ bus_unregister(&mikrobus_bus_type);
+ idr_destroy(&mikrobus_port_idr);
+ is_registered = false;
+ return retval;
+}
+subsys_initcall(mikrobus_init);
+
+static void mikrobus_exit(void)
+{
+ platform_driver_unregister(&mikrobus_port_driver);
+ bus_unregister(&mikrobus_bus_type);
+ class_compat_unregister(mikrobus_port_compat_class);
+ idr_destroy(&mikrobus_port_idr);
+}
+module_exit(mikrobus_exit);
+
+MODULE_AUTHOR("Vaishnav M A <vaishnav@beagleboard.org>");
+MODULE_AUTHOR("Ayush Singh <ayushdevel1325@beagleboard.org>");
+MODULE_DESCRIPTION("mikroBUS main module");
+MODULE_LICENSE("GPL");
diff --git a/drivers/misc/mikrobus/mikrobus_core.h b/drivers/misc/mikrobus/mikrobus_core.h
new file mode 100644
index 000000000000..8bd101828964
--- /dev/null
+++ b/drivers/misc/mikrobus/mikrobus_core.h
@@ -0,0 +1,201 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * mikroBUS Driver for instantiating add-on
+ * board devices with an identifier EEPROM
+ *
+ * Copyright 2020 Vaishnav M A, BeagleBoard.org Foundation.
+ */
+
+#ifndef __MIKROBUS_H
+#define __MIKROBUS_H
+
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/i2c.h>
+#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
+#include <linux/gpio/machine.h>
+#include <linux/spi/spi.h>
+#include <linux/serdev.h>
+#include <linux/property.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/nvmem-consumer.h>
+#include <linux/nvmem-provider.h>
+
+#define MIKROBUS_VERSION_MAJOR 0x00
+#define MIKROBUS_VERSION_MINOR 0x03
+
+#define MIKROBUS_NAME_SIZE 40
+#define MIKROBUS_PINCTRL_NAME_SIZE 20
+
+#define MIKROBUS_NUM_PINCTRL_STATE 4
+#define MIKROBUS_NUM_CS 2
+
+#define MIKROBUS_PINCTRL_PWM 0
+#define MIKROBUS_PINCTRL_UART 1
+#define MIKROBUS_PINCTRL_I2C 2
+#define MIKROBUS_PINCTRL_SPI 3
+
+#define MIKROBUS_PINCTRL_STATE_GPIO "gpio"
+
+#define MIKROBUS_EEPROM_EXIT_ID_CMD 0xD2
+
+extern const struct bus_type mikrobus_bus_type;
+extern const struct device_type mikrobus_port_type;
+extern const char *MIKROBUS_PINCTRL_STR[];
+
+enum mikrobus_property_type {
+ MIKROBUS_PROPERTY_TYPE_MIKROBUS = 0x00,
+ MIKROBUS_PROPERTY_TYPE_PROPERTY = 0x01,
+ MIKROBUS_PROPERTY_TYPE_GPIO = 0x02,
+ MIKROBUS_PROPERTY_TYPE_U8 = 0x03,
+ MIKROBUS_PROPERTY_TYPE_U16 = 0x04,
+ MIKROBUS_PROPERTY_TYPE_U32 = 0x05,
+ MIKROBUS_PROPERTY_TYPE_U64 = 0x06,
+ MIKROBUS_PROPERTY_TYPE_REGULATOR = 0x07,
+ MIKROBUS_PROPERTY_TYPE_CLOCK = 0x08,
+};
+
+enum mikrobus_pin {
+ MIKROBUS_PIN_PWM = 0x00,
+ MIKROBUS_PIN_INT = 0x01,
+ MIKROBUS_PIN_RX = 0x02,
+ MIKROBUS_PIN_TX = 0x03,
+ MIKROBUS_PIN_SCL = 0x04,
+ MIKROBUS_PIN_SDA = 0x05,
+ MIKROBUS_PIN_MOSI = 0x06,
+ MIKROBUS_PIN_MISO = 0x07,
+ MIKROBUS_PIN_SCK = 0x08,
+ MIKROBUS_PIN_CS = 0x09,
+ MIKROBUS_PIN_RST = 0x0A,
+ MIKROBUS_PIN_AN = 0x0B,
+ MIKROBUS_PORT_PIN_COUNT = 0x0C,
+};
+
+enum mikrobus_pin_state {
+ MIKROBUS_STATE_INPUT = 0x01,
+ MIKROBUS_STATE_OUTPUT_HIGH = 0x02,
+ MIKROBUS_STATE_OUTPUT_LOW = 0x03,
+ MIKROBUS_STATE_PWM = 0x04,
+ MIKROBUS_STATE_SPI = 0x05,
+ MIKROBUS_STATE_I2C = 0x06,
+ MIKROBUS_STATE_UART = 0x07,
+};
+
+/*
+ * board_device_info describes a single device on a mikrobus add-on
+ * board, an add-on board can present one or more device to the host
+ *
+ * @gpio_lookup: used to provide the GPIO lookup table for
+ * passing the named GPIOs to device drivers.
+ * @properties: used to provide the property_entry to pass named
+ * properties to device drivers, applicable only when driver uses
+ * device_property_read_* calls to fetch the properties.
+ * @num_gpio_resources: number of named gpio resources for the device,
+ * used mainly for gpiod_lookup_table memory allocation.
+ * @num_properties: number of custom properties for the device,
+ * used mainly for property_entry memory allocation.
+ * @protocol: used to know the type of the device and it should
+ * contain one of the values defined under 'enum greybus_class_type'
+ * under linux/greybus/greybus_manifest.h
+ * @reg: I2C address for the device, for devices on the SPI bus
+ * this field is the chip select address relative to the mikrobus
+ * port:0->device chip select connected to CS pin on mikroBUS port
+ * 1->device chip select connected to RST Pin on mikroBUS port
+ * @mode: SPI mode
+ * @max_speed_hz: SPI max speed(Hz)
+ * @drv_name: device_id to match with the driver
+ * @irq_type: type of IRQ trigger , match with defines in linux/interrupt.h
+ * @irq: irq number relative to the mikrobus port should contain one of the
+ * values defined under 'enum mikrobus_pin'
+ * @id: device id starting from 1
+ */
+struct board_device_info {
+ struct gpiod_lookup_table *gpio_lookup;
+ struct property_entry *properties;
+ struct property_entry *regulators;
+ struct property_entry *clocks;
+ struct list_head links;
+ unsigned short num_gpio_resources;
+ unsigned short num_properties;
+ unsigned short num_regulators;
+ unsigned short num_clocks;
+ unsigned short protocol;
+ unsigned short reg;
+ unsigned int mode;
+ void *dev_client;
+ u32 max_speed_hz;
+ char *drv_name;
+ int irq_type;
+ int irq;
+ int id;
+};
+
+/*
+ * addon_board_info describes a mikrobus add-on device the add-on
+ * board, an add-on board can present one or more device to the host
+ *
+ * @manifest_descs: list of manifest descriptors
+ * @devices: list of devices on the board
+ * @pin_state: the state of each pin on the mikrobus port required
+ * for the add-on board should contain one of the values defined under
+ * 'enum mikrobus_pin_state' restrictions are as per mikrobus standard
+ * specifications.
+ * @name: add-on board name
+ */
+struct addon_board_info {
+ struct list_head manifest_descs;
+ struct list_head devices;
+ u8 pin_state[MIKROBUS_PORT_PIN_COUNT];
+ char *name;
+};
+
+/*
+ * mikrobus_port describes the peripherals mapped to a
+ * mikrobus port.
+ *
+ * @eeprom_client: i2c_client corresponding to the eeprom
+ * on the add-on board.
+ * @board: pointer to the attached add-on board.
+ * @i2c_adap: I2C adapter attached to the mikrobus port.
+ * @spi_mstr: SPI master attached to the mikrobus port.
+ * @eeprom: nvmem_device for the eeprom on the add-on board.
+ * @pwm: pwm_device attached to the mikrobus port PWM pin.
+ * @pinctrl_selected: current pinctrl_selected state.
+ * @chip_select: chip select number mapped to the SPI
+ * CS pin on the mikrobus port and the RST pin on the mikrobus
+ * port
+ * @id: port id starting from 1
+ */
+struct mikrobus_port {
+ struct addon_board_info *board;
+ struct nvmem_device *eeprom;
+ struct i2c_adapter *i2c_adap;
+ struct spi_controller *spi_ctrl;
+ struct w1_master *w1_master;
+ struct platform_device *w1_gpio;
+ struct serdev_controller *ser_ctrl;
+ struct gpio_descs *gpios;
+ struct pwm_device *pwm;
+ struct pinctrl *pinctrl;
+ struct module *owner;
+ struct device dev;
+ char name[MIKROBUS_NAME_SIZE];
+ char *pinctrl_selected[MIKROBUS_NUM_PINCTRL_STATE];
+ unsigned int chip_select[MIKROBUS_NUM_CS];
+ int skip_scan;
+ int id;
+};
+
+#define to_mikrobus_port(d) container_of(d, struct mikrobus_port, dev)
+
+void mikrobus_board_unregister(struct mikrobus_port *port, struct addon_board_info *board);
+int mikrobus_board_register(struct mikrobus_port *port, struct addon_board_info *board);
+int mikrobus_port_register(struct mikrobus_port *port);
+int mikrobus_port_pinctrl_select(struct mikrobus_port *port);
+void mikrobus_port_delete(struct mikrobus_port *port);
+int mikrobus_port_scan_eeprom(struct mikrobus_port *port);
+struct mikrobus_port *mikrobus_find_port_by_w1_master(struct w1_master *master);
+#endif /* __MIKROBUS_H */
diff --git a/drivers/misc/mikrobus/mikrobus_id.c b/drivers/misc/mikrobus/mikrobus_id.c
new file mode 100644
index 000000000000..42a0a558785d
--- /dev/null
+++ b/drivers/misc/mikrobus/mikrobus_id.c
@@ -0,0 +1,229 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * mikrobus_id.c - w1 mikroBUS ID family EEPROM driver
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/types.h>
+#include <linux/delay.h>
+
+#include <linux/crc16.h>
+#include <linux/w1.h>
+#include <linux/nvmem-provider.h>
+
+#include "mikrobus_core.h"
+
+#define W1_EEPROM_MIKROBUS_ID 0xCC
+#define W1_MIKROBUS_ID_EEPROM_SIZE 0x0200
+#define W1_MIKROBUS_ID_EEPROM_PAGE_SIZE 32
+#define W1_MIKROBUS_ID_READ_EEPROM 0x69
+#define W1_MIKROBUS_ID_WRITE_EEPROM 0x96
+#define W1_MIKROBUS_ID_RELEASE_EEPROM 0xAA
+#define W1_MIKROBUS_ID_EEPROM_READ_RETRIES 10
+
+#define W1_MIKROBUS_EEPROM_MANIFEST_START_PAGE 1
+
+static ssize_t mikrobus_manifest_store(struct device *device, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ u8 write_request[] = { W1_MIKROBUS_ID_WRITE_EEPROM,
+ W1_MIKROBUS_EEPROM_MANIFEST_START_PAGE };
+ u8 release_command = W1_MIKROBUS_ID_RELEASE_EEPROM;
+ struct w1_slave *sl = dev_to_w1_slave(device);
+ u16 crc, crc_read, pos = 0;
+ u8 status = 0;
+ int cnt;
+
+ if (count > W1_MIKROBUS_ID_EEPROM_SIZE)
+ return -ENOMEM;
+
+ mutex_lock(&sl->master->bus_mutex);
+
+ pr_info("mikrobus_id: writing manifest size = %lu bytes", count);
+ while (pos < count) {
+ if (w1_reset_select_slave(sl))
+ break;
+
+ w1_write_block(sl->master, write_request, sizeof(write_request));
+ crc = crc16(0, write_request, sizeof(write_request)) ^ 0xFFFF;
+ w1_read_block(sl->master, (u8 *)&crc_read, sizeof(crc_read));
+
+ if (crc != crc_read)
+ break;
+
+ for (cnt = 0; cnt < W1_MIKROBUS_ID_EEPROM_PAGE_SIZE; cnt++)
+ w1_write_8(sl->master, (u8)buf[cnt]);
+
+ crc = crc16(0, buf, W1_MIKROBUS_ID_EEPROM_PAGE_SIZE) ^ 0xFFFF;
+ usleep_range(1 * USEC_PER_MSEC, 2 * USEC_PER_MSEC);
+ w1_read_block(sl->master, (u8 *)&crc_read, sizeof(crc_read));
+
+ if (crc != crc_read)
+ break;
+
+ w1_write_8(sl->master, release_command);
+ usleep_range(10 * USEC_PER_MSEC, 15 * USEC_PER_MSEC);
+ status = w1_read_8(sl->master);
+ w1_read_block(sl->master, (u8 *)&crc_read, sizeof(crc_read));
+ crc = crc16(0, (u8 *)&release_command, sizeof(release_command)) ^ 0xFFFF;
+
+ if (status != W1_MIKROBUS_ID_RELEASE_EEPROM)
+ break;
+
+ if (crc != crc_read)
+ break;
+
+ buf += W1_MIKROBUS_ID_EEPROM_PAGE_SIZE;
+ pos += W1_MIKROBUS_ID_EEPROM_PAGE_SIZE;
+ write_request[1]++;
+ }
+
+ pr_info("mikrobus_id: manifest written bytes: %d", pos);
+ mutex_unlock(&sl->master->bus_mutex);
+
+ return count > pos ? count : pos;
+}
+static DEVICE_ATTR_WO(mikrobus_manifest);
+
+static struct attribute *w1_mikrobus_attrs[] = { &dev_attr_mikrobus_manifest.attr, NULL };
+
+ATTRIBUTE_GROUPS(w1_mikrobus);
+
+static int w1_mikrobus_id_readpage(struct w1_slave *sl, int pageaddr, char *buf)
+{
+ u8 crc_rdbuf[2];
+
+ if (w1_reset_select_slave(sl))
+ return -1;
+
+ w1_write_8(sl->master, W1_MIKROBUS_ID_READ_EEPROM);
+ w1_write_8(sl->master, pageaddr);
+ w1_read_block(sl->master, crc_rdbuf, 2);
+ w1_write_8(sl->master, W1_MIKROBUS_ID_RELEASE_EEPROM);
+ usleep_range(10 * USEC_PER_MSEC, 15 * USEC_PER_MSEC);
+ w1_read_block(sl->master, crc_rdbuf, 1);
+ w1_read_block(sl->master, buf, W1_MIKROBUS_ID_EEPROM_PAGE_SIZE);
+ w1_read_block(sl->master, crc_rdbuf, 2);
+
+ return 0;
+}
+
+static int w1_mikrobus_id_readbuf(struct w1_slave *sl, int count, int off, char *buf)
+{
+ int len = count - (count % W1_MIKROBUS_ID_EEPROM_PAGE_SIZE);
+ u8 pageaddr = off / W1_MIKROBUS_ID_EEPROM_PAGE_SIZE;
+ u8 temp_rdbuf[W1_MIKROBUS_ID_EEPROM_PAGE_SIZE];
+ int iter, index, ret;
+
+ while (len > 0) {
+ ret = w1_mikrobus_id_readpage(
+ sl, pageaddr, buf + (W1_MIKROBUS_ID_EEPROM_PAGE_SIZE * pageaddr - off));
+ pageaddr += 1;
+ len -= W1_MIKROBUS_ID_EEPROM_PAGE_SIZE;
+ }
+
+ if (count % W1_MIKROBUS_ID_EEPROM_PAGE_SIZE) {
+ ret = w1_mikrobus_id_readpage(sl, pageaddr, temp_rdbuf);
+ for (iter = W1_MIKROBUS_ID_EEPROM_PAGE_SIZE * pageaddr - off, index = 0;
+ iter < count; iter++, index++)
+ buf[iter] = temp_rdbuf[index];
+ }
+
+ return ret;
+}
+
+static int w1_mikrobus_id_readblock(struct w1_slave *sl, int off, int count, char *buf)
+{
+ int tries = W1_MIKROBUS_ID_EEPROM_READ_RETRIES;
+ int ret = -EINVAL;
+ u8 *cmp;
+
+ cmp = kzalloc(count, GFP_KERNEL);
+ if (!cmp)
+ return -ENOMEM;
+
+ do {
+ w1_mikrobus_id_readbuf(sl, count, off, buf);
+
+ w1_mikrobus_id_readbuf(sl, count, off, cmp);
+ if (!memcmp(cmp, buf, count)) {
+ ret = 0;
+ break;
+ }
+ } while (--tries);
+
+ kfree(cmp);
+ return ret;
+}
+
+static int w1_mikrobus_id_nvmem_read(void *priv, unsigned int off, void *buf, size_t count)
+{
+ struct w1_slave *sl = priv;
+ int ret;
+
+ mutex_lock(&sl->master->bus_mutex);
+ ret = w1_mikrobus_id_readblock(sl, off, count, buf);
+ mutex_unlock(&sl->master->bus_mutex);
+
+ return ret;
+}
+
+static int w1_mikrobus_id_add_slave(struct w1_slave *sl)
+{
+ struct nvmem_device *nvmem;
+ struct mikrobus_port *port;
+ struct nvmem_config nvmem_cfg = {
+ .dev = &sl->dev,
+ .reg_read = w1_mikrobus_id_nvmem_read,
+ .type = NVMEM_TYPE_EEPROM,
+ .read_only = true,
+ .word_size = 1,
+ .stride = 1,
+ .size = W1_MIKROBUS_ID_EEPROM_SIZE,
+ .priv = sl,
+ };
+
+ port = mikrobus_find_port_by_w1_master(sl->master);
+ if (!port)
+ return -ENODEV;
+
+ nvmem_cfg.name = port->name;
+ nvmem = devm_nvmem_register(&sl->dev, &nvmem_cfg);
+ if (IS_ERR(nvmem))
+ return PTR_ERR(nvmem);
+
+ port->eeprom = nvmem;
+ mikrobus_port_scan_eeprom(port);
+
+ return 0;
+}
+
+static const struct w1_family_ops w1_family_mikrobus_id_fops = { .add_slave =
+ w1_mikrobus_id_add_slave,
+ .groups = w1_mikrobus_groups };
+
+static struct w1_family w1_family_mikrobus_id = {
+ .fid = W1_EEPROM_MIKROBUS_ID,
+ .fops = &w1_family_mikrobus_id_fops,
+};
+
+static int w1_mikrobusid_init(void)
+{
+ return w1_register_family(&w1_family_mikrobus_id);
+}
+
+static void w1_mikrobusid_exit(void)
+{
+ w1_unregister_family(&w1_family_mikrobus_id);
+}
+
+module_init(w1_mikrobusid_init);
+module_exit(w1_mikrobusid_exit);
+
+MODULE_AUTHOR("Vaishnav M A <vaishnav@beagleboard.org>");
+MODULE_DESCRIPTION("w1 family CC driver for mikroBUS ID EEPROM");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("w1-family-" __stringify(W1_EEPROM_MIKROBUS_ID));
diff --git a/drivers/misc/mikrobus/mikrobus_manifest.c b/drivers/misc/mikrobus/mikrobus_manifest.c
new file mode 100644
index 000000000000..3121a1d01b8b
--- /dev/null
+++ b/drivers/misc/mikrobus/mikrobus_manifest.c
@@ -0,0 +1,502 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * mikroBUS manifest parsing, an
+ * extension to Greybus Manifest Parsing
+ * under drivers/greybus/manifest.c
+ *
+ * Copyright 2014-2015 Google Inc.
+ * Copyright 2014-2015 Linaro Ltd.
+ */
+
+#define pr_fmt(fmt) "mikrobus_manifest:%s: " fmt, __func__
+
+#include <linux/bits.h>
+#include <linux/types.h>
+#include <linux/property.h>
+#include <linux/greybus/greybus_manifest.h>
+
+#include "mikrobus_manifest.h"
+
+struct manifest_desc {
+ struct list_head links;
+ size_t size;
+ void *data;
+ enum greybus_descriptor_type type;
+};
+
+static void manifest_descriptor_release_all(struct addon_board_info *board)
+{
+ struct manifest_desc *descriptor, *next;
+
+ list_for_each_entry_safe(descriptor, next, &board->manifest_descs, links) {
+ list_del(&descriptor->links);
+ kfree(descriptor);
+ }
+}
+
+static int board_descriptor_add(struct addon_board_info *board, struct greybus_descriptor *desc,
+ size_t size)
+{
+ struct greybus_descriptor_header *desc_header = &desc->header;
+ struct manifest_desc *descriptor;
+ size_t desc_size, expected_size;
+
+ if (size < sizeof(*desc_header)) {
+ pr_err("short descriptor (%zu < %zu)", size, sizeof(*desc_header));
+ return -EINVAL;
+ }
+
+ desc_size = le16_to_cpu(desc_header->size);
+ if (desc_size > size) {
+ pr_err("incorrect descriptor size (%zu != %zu)", size, desc_size);
+ return -EINVAL;
+ }
+
+ expected_size = sizeof(*desc_header);
+ switch (desc_header->type) {
+ case GREYBUS_TYPE_STRING:
+ expected_size += sizeof(struct greybus_descriptor_string);
+ expected_size += desc->string.length;
+ expected_size = ALIGN(expected_size, 4);
+ break;
+ case GREYBUS_TYPE_PROPERTY:
+ expected_size += sizeof(struct greybus_descriptor_property);
+ expected_size += desc->property.length;
+ expected_size = ALIGN(expected_size, 4);
+ break;
+ case GREYBUS_TYPE_DEVICE:
+ expected_size += sizeof(struct greybus_descriptor_device);
+ break;
+ case GREYBUS_TYPE_MIKROBUS:
+ expected_size += sizeof(struct greybus_descriptor_mikrobus);
+ break;
+ case GREYBUS_TYPE_INTERFACE:
+ expected_size += sizeof(struct greybus_descriptor_interface);
+ break;
+ case GREYBUS_TYPE_CPORT:
+ expected_size += sizeof(struct greybus_descriptor_cport);
+ break;
+ case GREYBUS_TYPE_BUNDLE:
+ expected_size += sizeof(struct greybus_descriptor_bundle);
+ break;
+ case GREYBUS_TYPE_INVALID:
+ default:
+ pr_err("invalid descriptor type %d", desc_header->type);
+ return -EINVAL;
+ }
+
+ descriptor = kzalloc(sizeof(*descriptor), GFP_KERNEL);
+ if (!descriptor)
+ return -ENOMEM;
+
+ descriptor->size = desc_size;
+ descriptor->data = (char *)desc + sizeof(*desc_header);
+ descriptor->type = desc_header->type;
+ list_add_tail(&descriptor->links, &board->manifest_descs);
+
+ return desc_size;
+}
+
+static char *mikrobus_string_get(struct addon_board_info *board, u8 string_id)
+{
+ struct greybus_descriptor_string *desc_string;
+ struct manifest_desc *descriptor;
+ bool found = false;
+ char *string;
+
+ if (!string_id)
+ return NULL;
+
+ list_for_each_entry(descriptor, &board->manifest_descs, links) {
+ if (descriptor->type != GREYBUS_TYPE_STRING)
+ continue;
+
+ desc_string = descriptor->data;
+ if (desc_string->id == string_id) {
+ found = true;
+ break;
+ }
+ }
+
+ if (!found)
+ return ERR_PTR(-ENOENT);
+
+ string = kmemdup(&desc_string->string, desc_string->length + 1, GFP_KERNEL);
+ if (!string)
+ return ERR_PTR(-ENOMEM);
+
+ string[desc_string->length] = '\0';
+
+ return string;
+}
+
+static void mikrobus_state_get(struct addon_board_info *board)
+{
+ struct greybus_descriptor_mikrobus *mikrobus;
+ struct greybus_descriptor_interface *interface;
+ struct manifest_desc *descriptor;
+ bool found = false;
+ size_t i;
+
+ list_for_each_entry(descriptor, &board->manifest_descs, links) {
+ if (descriptor->type == GREYBUS_TYPE_MIKROBUS) {
+ mikrobus = descriptor->data;
+ found = true;
+ break;
+ }
+ }
+
+ if (!found) {
+ pr_err("mikrobus descriptor not found");
+ return;
+ }
+
+ for (i = 0; i < MIKROBUS_PORT_PIN_COUNT; i++)
+ board->pin_state[i] = mikrobus->pin_state[i];
+
+ found = false;
+ list_for_each_entry(descriptor, &board->manifest_descs, links) {
+ if (descriptor->type == GREYBUS_TYPE_INTERFACE) {
+ interface = descriptor->data;
+ found = true;
+ break;
+ }
+ }
+
+ if (!found) {
+ pr_err("interface descriptor not found");
+ return;
+ }
+
+ board->name = mikrobus_string_get(board, interface->product_stringid);
+}
+
+static struct property_entry *mikrobus_property_entry_get(struct addon_board_info *board,
+ u8 *prop_link, int num_properties)
+{
+ struct greybus_descriptor_property *desc_property;
+ struct manifest_desc *descriptor;
+ struct property_entry *properties;
+ bool found = false;
+ char *prop_name;
+ int i, retval;
+ u64 *val_u64;
+ u32 *val_u32;
+ u16 *val_u16;
+ u8 *val_u8;
+
+ properties = kcalloc(num_properties, sizeof(*properties), GFP_KERNEL);
+ if (!properties)
+ return ERR_PTR(-ENOMEM);
+
+ for (i = 0; i < num_properties; i++) {
+ list_for_each_entry(descriptor, &board->manifest_descs, links) {
+ if (descriptor->type != GREYBUS_TYPE_PROPERTY)
+ continue;
+
+ desc_property = descriptor->data;
+ if (desc_property->id == prop_link[i]) {
+ found = true;
+ break;
+ }
+ }
+
+ if (!found) {
+ retval = -ENOENT;
+ goto early_exit;
+ }
+
+ prop_name = mikrobus_string_get(board, desc_property->propname_stringid);
+ if (!prop_name) {
+ retval = -ENOENT;
+ goto early_exit;
+ }
+
+ switch (desc_property->type) {
+ case MIKROBUS_PROPERTY_TYPE_U8:
+ val_u8 = kmemdup(&desc_property->value,
+ (desc_property->length) * sizeof(u8), GFP_KERNEL);
+ if (desc_property->length == 1)
+ properties[i] = PROPERTY_ENTRY_U8(prop_name, *val_u8);
+ else
+ properties[i] = PROPERTY_ENTRY_U8_ARRAY_LEN(
+ prop_name, (void *)desc_property->value,
+ desc_property->length);
+ break;
+ case MIKROBUS_PROPERTY_TYPE_U16:
+ val_u16 = kmemdup(&desc_property->value,
+ (desc_property->length) * sizeof(u16), GFP_KERNEL);
+ if (desc_property->length == 1)
+ properties[i] = PROPERTY_ENTRY_U16(prop_name, *val_u16);
+ else
+ properties[i] = PROPERTY_ENTRY_U16_ARRAY_LEN(
+ prop_name, (void *)desc_property->value,
+ desc_property->length);
+ break;
+ case MIKROBUS_PROPERTY_TYPE_U32:
+ val_u32 = kmemdup(&desc_property->value,
+ (desc_property->length) * sizeof(u32), GFP_KERNEL);
+ if (desc_property->length == 1)
+ properties[i] = PROPERTY_ENTRY_U32(prop_name, *val_u32);
+ else
+ properties[i] = PROPERTY_ENTRY_U32_ARRAY_LEN(
+ prop_name, (void *)desc_property->value,
+ desc_property->length);
+ break;
+ case MIKROBUS_PROPERTY_TYPE_U64:
+ val_u64 = kmemdup(&desc_property->value,
+ (desc_property->length) * sizeof(u64), GFP_KERNEL);
+ if (desc_property->length == 1)
+ properties[i] = PROPERTY_ENTRY_U64(prop_name, *val_u64);
+ else
+ properties[i] = PROPERTY_ENTRY_U64_ARRAY_LEN(
+ prop_name, (void *)desc_property->value,
+ desc_property->length);
+ break;
+ default:
+ retval = -EINVAL;
+ goto early_exit;
+ }
+ }
+ return properties;
+
+early_exit:
+ kfree(properties);
+ return ERR_PTR(retval);
+}
+
+static u8 *mikrobus_property_link_get(struct addon_board_info *board, u8 prop_id,
+ struct board_device_info *board_dev, u8 prop_type)
+{
+ struct greybus_descriptor_property *desc_property;
+ struct manifest_desc *descriptor;
+ bool found = false;
+ u8 *val_u8;
+
+ if (!prop_id)
+ return NULL;
+
+ list_for_each_entry(descriptor, &board->manifest_descs, links) {
+ if (descriptor->type != GREYBUS_TYPE_PROPERTY)
+ continue;
+
+ desc_property = descriptor->data;
+ if (desc_property->id == prop_id && desc_property->type == prop_type) {
+ found = true;
+ break;
+ }
+ }
+
+ if (!found)
+ return ERR_PTR(-ENOENT);
+
+ val_u8 = kmemdup(&desc_property->value, desc_property->length, GFP_KERNEL);
+ if (prop_type == MIKROBUS_PROPERTY_TYPE_GPIO)
+ board_dev->num_gpio_resources = desc_property->length;
+ else if (prop_type == MIKROBUS_PROPERTY_TYPE_PROPERTY)
+ board_dev->num_properties = desc_property->length;
+ else if (prop_type == MIKROBUS_PROPERTY_TYPE_REGULATOR)
+ board_dev->num_regulators = desc_property->length;
+ else if (prop_type == MIKROBUS_PROPERTY_TYPE_CLOCK)
+ board_dev->num_clocks = desc_property->length;
+
+ return val_u8;
+}
+
+static int mikrobus_manifest_attach_device(struct addon_board_info *board,
+ struct greybus_descriptor_device *dev_desc)
+{
+ u8 *gpio_desc_link, *prop_link, *gpioval, *reg_link, *clock_link;
+ struct greybus_descriptor_property *desc_property;
+ struct board_device_info *board_dev;
+ struct gpiod_lookup_table *lookup;
+ struct manifest_desc *descriptor;
+ int retval, i;
+
+ board_dev = kzalloc(sizeof(*board_dev), GFP_KERNEL);
+ if (!board_dev)
+ return -ENOMEM;
+
+ board_dev->id = dev_desc->id;
+ board_dev->drv_name = mikrobus_string_get(board, dev_desc->driver_stringid);
+ if (!board_dev->drv_name) {
+ retval = -ENOENT;
+ goto err_free_board_dev;
+ }
+
+ board_dev->protocol = dev_desc->protocol;
+ board_dev->reg = dev_desc->reg;
+ board_dev->irq = dev_desc->irq;
+ board_dev->irq_type = dev_desc->irq_type;
+ board_dev->max_speed_hz = le32_to_cpu(dev_desc->max_speed_hz);
+ board_dev->mode = dev_desc->mode;
+ pr_info("parsed device %d, driver=%s", board_dev->id, board_dev->drv_name);
+
+ if (dev_desc->prop_link > 0) {
+ prop_link = mikrobus_property_link_get(board, dev_desc->prop_link, board_dev,
+ MIKROBUS_PROPERTY_TYPE_PROPERTY);
+ if (!prop_link) {
+ retval = -ENOENT;
+ goto err_free_board_dev;
+ }
+
+ pr_info("device %d, number of properties=%d", board_dev->id,
+ board_dev->num_properties);
+ board_dev->properties =
+ mikrobus_property_entry_get(board, prop_link, board_dev->num_properties);
+ }
+
+ if (dev_desc->gpio_link > 0) {
+ gpio_desc_link = mikrobus_property_link_get(board, dev_desc->gpio_link, board_dev,
+ MIKROBUS_PROPERTY_TYPE_GPIO);
+ if (!gpio_desc_link) {
+ retval = -ENOENT;
+ goto err_free_board_dev;
+ }
+
+ pr_info("device %d, number of gpio resource=%d", board_dev->id,
+ board_dev->num_gpio_resources);
+ lookup = kzalloc(struct_size(lookup, table, board_dev->num_gpio_resources),
+ GFP_KERNEL);
+ if (!lookup) {
+ retval = -ENOMEM;
+ goto err_free_board_dev;
+ }
+
+ for (i = 0; i < board_dev->num_gpio_resources; i++) {
+ list_for_each_entry(descriptor, &board->manifest_descs, links) {
+ if (descriptor->type != GREYBUS_TYPE_PROPERTY)
+ continue;
+
+ desc_property = descriptor->data;
+ if (desc_property->id == gpio_desc_link[i]) {
+ gpioval = desc_property->value;
+ lookup->table[i].chip_hwnum = gpioval[0];
+ lookup->table[i].flags = gpioval[1];
+ lookup->table[i].con_id = mikrobus_string_get(
+ board, desc_property->propname_stringid);
+ break;
+ }
+ }
+ }
+ board_dev->gpio_lookup = lookup;
+ }
+
+ if (dev_desc->reg_link > 0) {
+ reg_link = mikrobus_property_link_get(board, dev_desc->reg_link, board_dev,
+ MIKROBUS_PROPERTY_TYPE_REGULATOR);
+ if (!reg_link) {
+ retval = -ENOENT;
+ goto err_free_board_dev;
+ }
+ pr_info("device %d, number of regulators=%d", board_dev->id,
+ board_dev->num_regulators);
+ board_dev->regulators =
+ mikrobus_property_entry_get(board, reg_link, board_dev->num_regulators);
+ }
+
+ if (dev_desc->clock_link > 0) {
+ clock_link = mikrobus_property_link_get(board, dev_desc->clock_link, board_dev,
+ MIKROBUS_PROPERTY_TYPE_CLOCK);
+ if (!clock_link) {
+ retval = -ENOENT;
+ goto err_free_board_dev;
+ }
+ pr_info("device %d, number of clocks=%d", board_dev->id, board_dev->num_clocks);
+ board_dev->clocks =
+ mikrobus_property_entry_get(board, clock_link, board_dev->num_clocks);
+ }
+
+ list_add_tail(&board_dev->links, &board->devices);
+ return 0;
+
+err_free_board_dev:
+ kfree(board_dev);
+ return retval;
+}
+
+static int mikrobus_manifest_parse_devices(struct addon_board_info *board)
+{
+ struct greybus_descriptor_device *desc_device;
+ struct manifest_desc *desc, *next;
+ int retval, devcount = 0;
+
+ list_for_each_entry_safe(desc, next, &board->manifest_descs, links) {
+ if (desc->type != GREYBUS_TYPE_DEVICE)
+ continue;
+
+ desc_device = desc->data;
+ retval = mikrobus_manifest_attach_device(board, desc_device);
+ devcount++;
+ }
+
+ return devcount;
+}
+
+int mikrobus_manifest_parse(struct addon_board_info *board, void *data, size_t size)
+{
+ struct greybus_manifest_header *header;
+ struct greybus_manifest *manifest;
+ struct greybus_descriptor *desc;
+ int dev_count, desc_size;
+ u16 manifest_size;
+
+ if (size < sizeof(*header)) {
+ pr_err("short manifest (%zu < %zu)", size, sizeof(*header));
+ return -EINVAL;
+ }
+
+ manifest = data;
+ header = &manifest->header;
+ manifest_size = le16_to_cpu(header->size);
+
+ if (manifest_size != size) {
+ pr_err("invalid manifest size(%zu < %u)", size, manifest_size);
+ return -EINVAL;
+ }
+
+ if (header->version_major > MIKROBUS_VERSION_MAJOR) {
+ pr_err("manifest version too new (%u.%u > %u.%u)", header->version_major,
+ header->version_minor, MIKROBUS_VERSION_MAJOR, MIKROBUS_VERSION_MINOR);
+ return -EINVAL;
+ }
+
+ desc = manifest->descriptors;
+ size -= sizeof(*header);
+ while (size) {
+ desc_size = board_descriptor_add(board, desc, size);
+ if (desc_size < 0) {
+ pr_err("invalid manifest descriptor, size: %u", desc_size);
+ return -EINVAL;
+ }
+
+ desc = (void *)desc + desc_size;
+ size -= desc_size;
+ }
+
+ mikrobus_state_get(board);
+ dev_count = mikrobus_manifest_parse_devices(board);
+ pr_info(" %s manifest parsed with %d devices", board->name, dev_count);
+ manifest_descriptor_release_all(board);
+
+ return true;
+}
+
+size_t mikrobus_manifest_header_validate(void *data, size_t size)
+{
+ struct greybus_manifest_header *header = data;
+ u16 manifest_size = le16_to_cpu(header->size);
+
+ if (manifest_size < sizeof(*header)) {
+ pr_err("short manifest (%zu < %zu)", size, sizeof(*header));
+ return -EINVAL;
+ }
+
+ if (header->version_major > MIKROBUS_VERSION_MAJOR) {
+ pr_err("manifest version too new (%u.%u > %u.%u)", header->version_major,
+ header->version_minor, MIKROBUS_VERSION_MAJOR, MIKROBUS_VERSION_MINOR);
+ return -EINVAL;
+ }
+
+ return manifest_size;
+}
diff --git a/drivers/misc/mikrobus/mikrobus_manifest.h b/drivers/misc/mikrobus/mikrobus_manifest.h
new file mode 100644
index 000000000000..36b64b2093f5
--- /dev/null
+++ b/drivers/misc/mikrobus/mikrobus_manifest.h
@@ -0,0 +1,20 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * mikroBUS manifest definition
+ * extension to Greybus Manifest Definition
+ *
+ * Copyright 2014-2015 Google Inc.
+ * Copyright 2014-2015 Linaro Ltd.
+ *
+ * Released under the GPLv2 and BSD licenses.
+ */
+
+#ifndef __MIKROBUS_MANIFEST_H
+#define __MIKROBUS_MANIFEST_H
+
+#include "mikrobus_core.h"
+
+int mikrobus_manifest_parse(struct addon_board_info *info, void *data, size_t size);
+size_t mikrobus_manifest_header_validate(void *data, size_t size);
+
+#endif /* __MIKROBUS_MANIFEST_H */
--
2.44.0