| /* |
| * GPIO Greybus driver. |
| * |
| * Copyright 2014 Google Inc. |
| * Copyright 2014 Linaro Ltd. |
| * |
| * Released under the GPLv2 only. |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/slab.h> |
| #include <linux/gpio.h> |
| #include <linux/irq.h> |
| #include <linux/irqdomain.h> |
| #include "greybus.h" |
| |
| struct gb_gpio_line { |
| /* The following has to be an array of line_max entries */ |
| /* --> make them just a flags field */ |
| u8 active: 1, |
| direction: 1, /* 0 = output, 1 = input */ |
| value: 1; /* 0 = low, 1 = high */ |
| u16 debounce_usec; |
| }; |
| |
| struct gb_gpio_controller { |
| struct gb_connection *connection; |
| u8 version_major; |
| u8 version_minor; |
| u8 line_max; /* max line number */ |
| struct gb_gpio_line *lines; |
| |
| struct gpio_chip chip; |
| struct irq_chip irqc; |
| struct irq_chip *irqchip; |
| struct irq_domain *irqdomain; |
| unsigned int irq_base; |
| irq_flow_handler_t irq_handler; |
| unsigned int irq_default_type; |
| }; |
| #define gpio_chip_to_gb_gpio_controller(chip) \ |
| container_of(chip, struct gb_gpio_controller, chip) |
| #define irq_data_to_gpio_chip(d) (d->domain->host_data) |
| |
| /* Version of the Greybus GPIO protocol we support */ |
| #define GB_GPIO_VERSION_MAJOR 0x00 |
| #define GB_GPIO_VERSION_MINOR 0x01 |
| |
| /* Greybus GPIO request types */ |
| #define GB_GPIO_TYPE_INVALID 0x00 |
| #define GB_GPIO_TYPE_PROTOCOL_VERSION 0x01 |
| #define GB_GPIO_TYPE_LINE_COUNT 0x02 |
| #define GB_GPIO_TYPE_ACTIVATE 0x03 |
| #define GB_GPIO_TYPE_DEACTIVATE 0x04 |
| #define GB_GPIO_TYPE_GET_DIRECTION 0x05 |
| #define GB_GPIO_TYPE_DIRECTION_IN 0x06 |
| #define GB_GPIO_TYPE_DIRECTION_OUT 0x07 |
| #define GB_GPIO_TYPE_GET_VALUE 0x08 |
| #define GB_GPIO_TYPE_SET_VALUE 0x09 |
| #define GB_GPIO_TYPE_SET_DEBOUNCE 0x0a |
| #define GB_GPIO_TYPE_IRQ_TYPE 0x0b |
| #define GB_GPIO_TYPE_IRQ_ACK 0x0c |
| #define GB_GPIO_TYPE_IRQ_MASK 0x0d |
| #define GB_GPIO_TYPE_IRQ_UNMASK 0x0e |
| #define GB_GPIO_TYPE_IRQ_EVENT 0x0f |
| #define GB_GPIO_TYPE_RESPONSE 0x80 /* OR'd with rest */ |
| |
| #define GB_GPIO_DEBOUNCE_USEC_DEFAULT 0 /* microseconds */ |
| |
| /* line count request has no payload */ |
| struct gb_gpio_line_count_response { |
| __u8 count; |
| }; |
| |
| struct gb_gpio_activate_request { |
| __u8 which; |
| }; |
| /* activate response has no payload */ |
| |
| struct gb_gpio_deactivate_request { |
| __u8 which; |
| }; |
| /* deactivate response has no payload */ |
| |
| struct gb_gpio_get_direction_request { |
| __u8 which; |
| }; |
| struct gb_gpio_get_direction_response { |
| __u8 direction; |
| }; |
| |
| struct gb_gpio_direction_in_request { |
| __u8 which; |
| }; |
| /* direction in response has no payload */ |
| |
| struct gb_gpio_direction_out_request { |
| __u8 which; |
| __u8 value; |
| }; |
| /* direction out response has no payload */ |
| |
| struct gb_gpio_get_value_request { |
| __u8 which; |
| }; |
| struct gb_gpio_get_value_response { |
| __u8 value; |
| }; |
| |
| struct gb_gpio_set_value_request { |
| __u8 which; |
| __u8 value; |
| }; |
| /* set value response has no payload */ |
| |
| struct gb_gpio_set_debounce_request { |
| __u8 which; |
| __le16 usec __packed; |
| }; |
| /* debounce response has no payload */ |
| |
| struct gb_gpio_irq_type_request { |
| __u8 which; |
| __u8 type; |
| }; |
| /* irq type response has no payload */ |
| |
| struct gb_gpio_irq_mask_request { |
| __u8 which; |
| }; |
| /* irq mask response has no payload */ |
| |
| struct gb_gpio_irq_unmask_request { |
| __u8 which; |
| }; |
| /* irq unmask response has no payload */ |
| |
| struct gb_gpio_irq_ack_request { |
| __u8 which; |
| }; |
| /* irq ack response has no payload */ |
| |
| /* irq event requests originate on another module and are handled on the AP */ |
| struct gb_gpio_irq_event_request { |
| __u8 which; |
| }; |
| /* irq event response has no payload */ |
| |
| /* Define get_version() routine */ |
| define_get_version(gb_gpio_controller, GPIO); |
| |
| static int gb_gpio_line_count_operation(struct gb_gpio_controller *ggc) |
| { |
| struct gb_gpio_line_count_response response; |
| int ret; |
| |
| ret = gb_operation_sync(ggc->connection, GB_GPIO_TYPE_LINE_COUNT, |
| NULL, 0, &response, sizeof(response)); |
| if (!ret) |
| ggc->line_max = response.count; |
| return ret; |
| } |
| |
| static int gb_gpio_activate_operation(struct gb_gpio_controller *ggc, u8 which) |
| { |
| struct gb_gpio_activate_request request; |
| int ret; |
| |
| request.which = which; |
| ret = gb_operation_sync(ggc->connection, GB_GPIO_TYPE_ACTIVATE, |
| &request, sizeof(request), NULL, 0); |
| if (!ret) |
| ggc->lines[which].active = true; |
| return ret; |
| } |
| |
| static void gb_gpio_deactivate_operation(struct gb_gpio_controller *ggc, |
| u8 which) |
| { |
| struct gb_gpio_deactivate_request request; |
| int ret; |
| |
| request.which = which; |
| ret = gb_operation_sync(ggc->connection, GB_GPIO_TYPE_DEACTIVATE, |
| &request, sizeof(request), NULL, 0); |
| if (!ret) |
| ggc->lines[which].active = false; |
| } |
| |
| static int gb_gpio_get_direction_operation(struct gb_gpio_controller *ggc, |
| u8 which) |
| { |
| struct gb_gpio_get_direction_request request; |
| struct gb_gpio_get_direction_response response; |
| int ret; |
| u8 direction; |
| |
| request.which = which; |
| ret = gb_operation_sync(ggc->connection, GB_GPIO_TYPE_GET_DIRECTION, |
| &request, sizeof(request), |
| &response, sizeof(response)); |
| if (ret) |
| return ret; |
| |
| direction = response.direction; |
| if (direction && direction != 1) { |
| dev_warn(ggc->chip.dev, |
| "gpio %u direction was %u (should be 0 or 1)\n", |
| which, direction); |
| } |
| ggc->lines[which].direction = direction ? 1 : 0; |
| return 0; |
| } |
| |
| static int gb_gpio_direction_in_operation(struct gb_gpio_controller *ggc, |
| u8 which) |
| { |
| struct gb_gpio_direction_in_request request; |
| int ret; |
| |
| request.which = which; |
| ret = gb_operation_sync(ggc->connection, GB_GPIO_TYPE_DIRECTION_IN, |
| &request, sizeof(request), NULL, 0); |
| if (!ret) |
| ggc->lines[which].direction = 1; |
| return ret; |
| } |
| |
| static int gb_gpio_direction_out_operation(struct gb_gpio_controller *ggc, |
| u8 which, bool value_high) |
| { |
| struct gb_gpio_direction_out_request request; |
| int ret; |
| |
| request.which = which; |
| request.value = value_high ? 1 : 0; |
| ret = gb_operation_sync(ggc->connection, GB_GPIO_TYPE_DIRECTION_OUT, |
| &request, sizeof(request), NULL, 0); |
| if (!ret) |
| ggc->lines[which].direction = 0; |
| return ret; |
| } |
| |
| static int gb_gpio_get_value_operation(struct gb_gpio_controller *ggc, |
| u8 which) |
| { |
| struct gb_gpio_get_value_request request; |
| struct gb_gpio_get_value_response response; |
| int ret; |
| u8 value; |
| |
| request.which = which; |
| ret = gb_operation_sync(ggc->connection, GB_GPIO_TYPE_GET_VALUE, |
| &request, sizeof(request), |
| &response, sizeof(response)); |
| if (ret) |
| return ret; |
| |
| value = response.value; |
| if (value && value != 1) { |
| dev_warn(ggc->chip.dev, |
| "gpio %u value was %u (should be 0 or 1)\n", |
| which, value); |
| } |
| ggc->lines[which].value = value ? 1 : 0; |
| return 0; |
| } |
| |
| static void gb_gpio_set_value_operation(struct gb_gpio_controller *ggc, |
| u8 which, bool value_high) |
| { |
| struct gb_gpio_set_value_request request; |
| int ret; |
| |
| request.which = which; |
| request.value = value_high ? 1 : 0; |
| ret = gb_operation_sync(ggc->connection, GB_GPIO_TYPE_SET_VALUE, |
| &request, sizeof(request), NULL, 0); |
| if (!ret) { |
| /* XXX should this set direction to out? */ |
| ggc->lines[which].value = request.value; |
| } |
| } |
| |
| static int gb_gpio_set_debounce_operation(struct gb_gpio_controller *ggc, |
| u8 which, u16 debounce_usec) |
| { |
| struct gb_gpio_set_debounce_request request; |
| int ret; |
| |
| request.which = which; |
| request.usec = cpu_to_le16(debounce_usec); |
| ret = gb_operation_sync(ggc->connection, GB_GPIO_TYPE_SET_DEBOUNCE, |
| &request, sizeof(request), NULL, 0); |
| if (!ret) |
| ggc->lines[which].debounce_usec = debounce_usec; |
| return ret; |
| } |
| |
| static void gb_gpio_ack_irq(struct irq_data *d) |
| { |
| struct gpio_chip *chip = irq_data_to_gpio_chip(d); |
| struct gb_gpio_controller *ggc = gpio_chip_to_gb_gpio_controller(chip); |
| struct gb_gpio_irq_ack_request request; |
| int ret; |
| |
| request.which = d->hwirq; |
| ret = gb_operation_sync(ggc->connection, |
| GB_GPIO_TYPE_IRQ_ACK, |
| &request, sizeof(request), NULL, 0); |
| if (ret) |
| dev_err(chip->dev, "failed to ack irq: %d\n", ret); |
| } |
| |
| static void gb_gpio_mask_irq(struct irq_data *d) |
| { |
| struct gpio_chip *chip = irq_data_to_gpio_chip(d); |
| struct gb_gpio_controller *ggc = gpio_chip_to_gb_gpio_controller(chip); |
| struct gb_gpio_irq_mask_request request; |
| int ret; |
| |
| request.which = d->hwirq; |
| ret = gb_operation_sync(ggc->connection, |
| GB_GPIO_TYPE_IRQ_MASK, |
| &request, sizeof(request), NULL, 0); |
| if (ret) |
| dev_err(chip->dev, "failed to mask irq: %d\n", ret); |
| } |
| |
| static void gb_gpio_unmask_irq(struct irq_data *d) |
| { |
| struct gpio_chip *chip = irq_data_to_gpio_chip(d); |
| struct gb_gpio_controller *ggc = gpio_chip_to_gb_gpio_controller(chip); |
| struct gb_gpio_irq_unmask_request request; |
| int ret; |
| |
| request.which = d->hwirq; |
| ret = gb_operation_sync(ggc->connection, |
| GB_GPIO_TYPE_IRQ_UNMASK, |
| &request, sizeof(request), NULL, 0); |
| if (ret) |
| dev_err(chip->dev, "failed to unmask irq: %d\n", ret); |
| } |
| |
| static int gb_gpio_irq_set_type(struct irq_data *d, unsigned int type) |
| { |
| struct gpio_chip *chip = irq_data_to_gpio_chip(d); |
| struct gb_gpio_controller *ggc = gpio_chip_to_gb_gpio_controller(chip); |
| struct gb_gpio_irq_type_request request; |
| int ret = 0; |
| |
| request.which = d->hwirq; |
| request.type = type; |
| |
| switch (type) { |
| case IRQ_TYPE_NONE: |
| break; |
| case IRQ_TYPE_EDGE_RISING: |
| case IRQ_TYPE_EDGE_FALLING: |
| case IRQ_TYPE_EDGE_BOTH: |
| case IRQ_TYPE_LEVEL_LOW: |
| case IRQ_TYPE_LEVEL_HIGH: |
| ret = gb_operation_sync(ggc->connection, |
| GB_GPIO_TYPE_IRQ_TYPE, |
| &request, sizeof(request), NULL, 0); |
| if (ret) { |
| dev_err(chip->dev, "failed to set irq type: %d\n", |
| ret); |
| } |
| break; |
| default: |
| dev_err(chip->dev, "unsupported irq type: %u\n", type); |
| ret = -EINVAL; |
| } |
| |
| return ret; |
| } |
| |
| static void gb_gpio_request_recv(u8 type, struct gb_operation *op) |
| { |
| struct gb_gpio_controller *ggc; |
| struct gb_connection *connection = op->connection; |
| struct gb_message *request; |
| struct gb_gpio_irq_event_request *event; |
| int irq; |
| struct irq_desc *desc; |
| int ret; |
| |
| if (type != GB_GPIO_TYPE_IRQ_EVENT) { |
| dev_err(&connection->dev, |
| "unsupported unsolicited request: %u\n", type); |
| return; |
| } |
| |
| ggc = connection->private; |
| |
| request = op->request; |
| event = request->payload; |
| if (event->which > ggc->line_max) { |
| dev_err(ggc->chip.dev, "invalid hw irq: %d\n", event->which); |
| return; |
| } |
| irq = gpio_to_irq(ggc->chip.base + event->which); |
| desc = irq_to_desc(irq); |
| |
| /* Dispatch interrupt */ |
| local_irq_disable(); |
| handle_simple_irq(irq, desc); |
| local_irq_enable(); |
| |
| ret = gb_operation_response_send(op, 0); |
| if (ret) { |
| dev_err(ggc->chip.dev, |
| "failed to send response status %d: %d\n", 0, ret); |
| } |
| } |
| |
| static int gb_gpio_request(struct gpio_chip *chip, unsigned offset) |
| { |
| struct gb_gpio_controller *ggc = gpio_chip_to_gb_gpio_controller(chip); |
| |
| return gb_gpio_activate_operation(ggc, (u8)offset); |
| } |
| |
| static void gb_gpio_free(struct gpio_chip *chip, unsigned offset) |
| { |
| struct gb_gpio_controller *ggc = gpio_chip_to_gb_gpio_controller(chip); |
| |
| gb_gpio_deactivate_operation(ggc, (u8)offset); |
| } |
| |
| static int gb_gpio_get_direction(struct gpio_chip *chip, unsigned offset) |
| { |
| struct gb_gpio_controller *ggc = gpio_chip_to_gb_gpio_controller(chip); |
| u8 which; |
| int ret; |
| |
| which = (u8)offset; |
| ret = gb_gpio_get_direction_operation(ggc, which); |
| if (ret) |
| return ret; |
| |
| return ggc->lines[which].direction ? 1 : 0; |
| } |
| |
| static int gb_gpio_direction_input(struct gpio_chip *chip, unsigned offset) |
| { |
| struct gb_gpio_controller *ggc = gpio_chip_to_gb_gpio_controller(chip); |
| |
| return gb_gpio_direction_in_operation(ggc, (u8)offset); |
| } |
| |
| static int gb_gpio_direction_output(struct gpio_chip *chip, unsigned offset, |
| int value) |
| { |
| struct gb_gpio_controller *ggc = gpio_chip_to_gb_gpio_controller(chip); |
| |
| return gb_gpio_direction_out_operation(ggc, (u8)offset, !!value); |
| } |
| |
| static int gb_gpio_get(struct gpio_chip *chip, unsigned offset) |
| { |
| struct gb_gpio_controller *ggc = gpio_chip_to_gb_gpio_controller(chip); |
| u8 which; |
| int ret; |
| |
| which = (u8)offset; |
| ret = gb_gpio_get_value_operation(ggc, which); |
| if (ret) |
| return ret; |
| |
| return ggc->lines[which].value; |
| } |
| |
| static void gb_gpio_set(struct gpio_chip *chip, unsigned offset, int value) |
| { |
| struct gb_gpio_controller *ggc = gpio_chip_to_gb_gpio_controller(chip); |
| |
| gb_gpio_set_value_operation(ggc, (u8)offset, !!value); |
| } |
| |
| static int gb_gpio_set_debounce(struct gpio_chip *chip, unsigned offset, |
| unsigned debounce) |
| { |
| struct gb_gpio_controller *ggc = gpio_chip_to_gb_gpio_controller(chip); |
| u16 usec; |
| |
| if (debounce > U16_MAX) |
| return -EINVAL; |
| usec = (u16)debounce; |
| |
| return gb_gpio_set_debounce_operation(ggc, (u8)offset, usec); |
| } |
| |
| static void gb_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip) |
| { |
| return; /* XXX */ |
| } |
| |
| static int gb_gpio_controller_setup(struct gb_gpio_controller *ggc) |
| { |
| u32 line_count; |
| size_t size; |
| int ret; |
| |
| /* First thing we need to do is check the version */ |
| ret = get_version(ggc); |
| if (ret) |
| return ret; |
| |
| /* Now find out how many lines there are */ |
| ret = gb_gpio_line_count_operation(ggc); |
| if (ret) |
| return ret; |
| |
| line_count = (u32)ggc->line_max + 1; |
| size = line_count * sizeof(*ggc->lines); |
| ggc->lines = kzalloc(size, GFP_KERNEL); |
| if (!ggc->lines) |
| return -ENOMEM; |
| |
| return ret; |
| } |
| |
| /** |
| * gb_gpio_irq_map() - maps an IRQ into a GB gpio irqchip |
| * @d: the irqdomain used by this irqchip |
| * @irq: the global irq number used by this GB gpio irqchip irq |
| * @hwirq: the local IRQ/GPIO line offset on this GB gpio |
| * |
| * This function will set up the mapping for a certain IRQ line on a |
| * GB gpio by assigning the GB gpio as chip data, and using the irqchip |
| * stored inside the GB gpio. |
| */ |
| static int gb_gpio_irq_map(struct irq_domain *domain, unsigned int irq, |
| irq_hw_number_t hwirq) |
| { |
| struct gpio_chip *chip = domain->host_data; |
| struct gb_gpio_controller *ggc = gpio_chip_to_gb_gpio_controller(chip); |
| |
| irq_set_chip_data(irq, ggc); |
| irq_set_chip_and_handler(irq, ggc->irqchip, ggc->irq_handler); |
| #ifdef CONFIG_ARM |
| set_irq_flags(irq, IRQF_VALID); |
| #else |
| irq_set_noprobe(irq); |
| #endif |
| /* |
| * No set-up of the hardware will happen if IRQ_TYPE_NONE |
| * is passed as default type. |
| */ |
| if (ggc->irq_default_type != IRQ_TYPE_NONE) |
| irq_set_irq_type(irq, ggc->irq_default_type); |
| |
| return 0; |
| } |
| |
| static void gb_gpio_irq_unmap(struct irq_domain *d, unsigned int irq) |
| { |
| #ifdef CONFIG_ARM |
| set_irq_flags(irq, 0); |
| #endif |
| irq_set_chip_and_handler(irq, NULL, NULL); |
| irq_set_chip_data(irq, NULL); |
| } |
| |
| static const struct irq_domain_ops gb_gpio_domain_ops = { |
| .map = gb_gpio_irq_map, |
| .unmap = gb_gpio_irq_unmap, |
| }; |
| |
| /** |
| * gb_gpio_irqchip_remove() - removes an irqchip added to a gb_gpio_controller |
| * @ggc: the gb_gpio_controller to remove the irqchip from |
| * |
| * This is called only from gb_gpio_remove() |
| */ |
| static void gb_gpio_irqchip_remove(struct gb_gpio_controller *ggc) |
| { |
| unsigned int offset; |
| |
| /* Remove all IRQ mappings and delete the domain */ |
| if (ggc->irqdomain) { |
| for (offset = 0; offset < (ggc->line_max + 1); offset++) |
| irq_dispose_mapping(irq_find_mapping(ggc->irqdomain, offset)); |
| irq_domain_remove(ggc->irqdomain); |
| } |
| |
| if (ggc->irqchip) { |
| ggc->irqchip = NULL; |
| } |
| } |
| |
| |
| /** |
| * gb_gpio_irqchip_add() - adds an irqchip to a gpio chip |
| * @chip: the gpio chip to add the irqchip to |
| * @irqchip: the irqchip to add to the adapter |
| * @first_irq: if not dynamically assigned, the base (first) IRQ to |
| * allocate gpio irqs from |
| * @handler: the irq handler to use (often a predefined irq core function) |
| * @type: the default type for IRQs on this irqchip, pass IRQ_TYPE_NONE |
| * to have the core avoid setting up any default type in the hardware. |
| * |
| * This function closely associates a certain irqchip with a certain |
| * gpio chip, providing an irq domain to translate the local IRQs to |
| * global irqs, and making sure that the gpio chip |
| * is passed as chip data to all related functions. Driver callbacks |
| * need to use container_of() to get their local state containers back |
| * from the gpio chip passed as chip data. An irqdomain will be stored |
| * in the gpio chip that shall be used by the driver to handle IRQ number |
| * translation. The gpio chip will need to be initialized and registered |
| * before calling this function. |
| */ |
| static int gb_gpio_irqchip_add(struct gpio_chip *chip, |
| struct irq_chip *irqchip, |
| unsigned int first_irq, |
| irq_flow_handler_t handler, |
| unsigned int type) |
| { |
| struct gb_gpio_controller *ggc; |
| unsigned int offset; |
| unsigned irq_base; |
| |
| if (!chip || !irqchip) |
| return -EINVAL; |
| |
| ggc = gpio_chip_to_gb_gpio_controller(chip); |
| |
| ggc->irqchip = irqchip; |
| ggc->irq_handler = handler; |
| ggc->irq_default_type = type; |
| ggc->irqdomain = irq_domain_add_simple(NULL, |
| ggc->line_max + 1, first_irq, |
| &gb_gpio_domain_ops, chip); |
| if (!ggc->irqdomain) { |
| ggc->irqchip = NULL; |
| return -EINVAL; |
| } |
| |
| /* |
| * Prepare the mapping since the irqchip shall be orthogonal to |
| * any gpio calls. If the first_irq was zero, this is |
| * necessary to allocate descriptors for all IRQs. |
| */ |
| for (offset = 0; offset < (ggc->line_max + 1); offset++) { |
| irq_base = irq_create_mapping(ggc->irqdomain, offset); |
| if (offset == 0) |
| ggc->irq_base = irq_base; |
| } |
| |
| return 0; |
| } |
| |
| static int gb_gpio_to_irq(struct gpio_chip *chip, unsigned offset) |
| { |
| struct gb_gpio_controller *ggc = gpio_chip_to_gb_gpio_controller(chip); |
| |
| return irq_find_mapping(ggc->irqdomain, offset); |
| } |
| |
| static int gb_gpio_connection_init(struct gb_connection *connection) |
| { |
| struct gb_gpio_controller *ggc; |
| struct gpio_chip *gpio; |
| struct irq_chip *irqc; |
| int ret; |
| |
| ggc = kzalloc(sizeof(*ggc), GFP_KERNEL); |
| if (!ggc) |
| return -ENOMEM; |
| ggc->connection = connection; |
| connection->private = ggc; |
| |
| ret = gb_gpio_controller_setup(ggc); |
| if (ret) |
| goto err_free_controller; |
| |
| irqc = &ggc->irqc; |
| irqc->irq_ack = gb_gpio_ack_irq; |
| irqc->irq_mask = gb_gpio_mask_irq; |
| irqc->irq_unmask = gb_gpio_unmask_irq; |
| irqc->irq_set_type = gb_gpio_irq_set_type; |
| irqc->name = "greybus_gpio"; |
| |
| gpio = &ggc->chip; |
| |
| gpio->label = "greybus_gpio"; |
| gpio->dev = &connection->dev; |
| gpio->owner = THIS_MODULE; |
| |
| gpio->request = gb_gpio_request; |
| gpio->free = gb_gpio_free; |
| gpio->get_direction = gb_gpio_get_direction; |
| gpio->direction_input = gb_gpio_direction_input; |
| gpio->direction_output = gb_gpio_direction_output; |
| gpio->get = gb_gpio_get; |
| gpio->set = gb_gpio_set; |
| gpio->set_debounce = gb_gpio_set_debounce; |
| gpio->dbg_show = gb_gpio_dbg_show; |
| gpio->to_irq = gb_gpio_to_irq; |
| gpio->base = -1; /* Allocate base dynamically */ |
| gpio->ngpio = ggc->line_max + 1; |
| gpio->can_sleep = true; |
| |
| ret = gpiochip_add(gpio); |
| if (ret) { |
| dev_err(&connection->dev, "failed to add gpio chip: %d\n", |
| ret); |
| goto err_free_lines; |
| } |
| |
| ret = gb_gpio_irqchip_add(gpio, irqc, 0, |
| handle_simple_irq, IRQ_TYPE_NONE); |
| if (ret) { |
| dev_err(&connection->dev, "failed to add irq chip: %d\n", ret); |
| goto irqchip_err; |
| } |
| |
| return 0; |
| |
| irqchip_err: |
| gb_gpiochip_remove(gpio); |
| err_free_lines: |
| kfree(ggc->lines); |
| err_free_controller: |
| kfree(ggc); |
| return ret; |
| } |
| |
| static void gb_gpio_connection_exit(struct gb_connection *connection) |
| { |
| struct gb_gpio_controller *ggc = connection->private; |
| |
| if (!ggc) |
| return; |
| |
| gb_gpio_irqchip_remove(ggc); |
| gb_gpiochip_remove(&ggc->chip); |
| /* kref_put(ggc->connection) */ |
| kfree(ggc->lines); |
| kfree(ggc); |
| } |
| |
| static struct gb_protocol gpio_protocol = { |
| .name = "gpio", |
| .id = GREYBUS_PROTOCOL_GPIO, |
| .major = 0, |
| .minor = 1, |
| .connection_init = gb_gpio_connection_init, |
| .connection_exit = gb_gpio_connection_exit, |
| .request_recv = gb_gpio_request_recv, |
| }; |
| |
| int gb_gpio_protocol_init(void) |
| { |
| return gb_protocol_register(&gpio_protocol); |
| } |
| |
| void gb_gpio_protocol_exit(void) |
| { |
| gb_protocol_deregister(&gpio_protocol); |
| } |