diff options
Diffstat (limited to 'mtac.c')
| -rw-r--r-- | mtac.c | 460 |
1 files changed, 460 insertions, 0 deletions
@@ -0,0 +1,460 @@ +#define DRIVER_VERSION "v1.0.0" +#define DRIVER_AUTHOR "John Klug <john.klug@multitech.com>" +#define DRIVER_DESC "MTS driver to supervise MTAC slots" +#define DRIVER_NAME "mtac-slots" +/* #define DEBUG 1 */ + +#include <linux/types.h> +#include <linux/gpio.h> +#include <linux/platform_device.h> +#include <linux/kmod.h> +#include <linux/bitops.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/mts_io.h> + +#include "mtac.h" + +/* accessory card EEPROMs, read outside of driver */ +extern uint8_t mts_ap_eeprom[NUM_AP][512]; + +/* info for accessory port (contains function pointers for setup and teardown, + * gpio pin list for the device inserted into the port. */ +struct ap_info* mtac_port_info[NUM_AP]; +EXPORT_SYMBOL(mtac_port_info); /* Formerly port_info */ + +/* Protect the mtac port info structure */ +DEFINE_MUTEX(mtac_mutex); +EXPORT_SYMBOL(mtac_mutex); + +void mtac_clear_port_pins(int port_index) +{ + char buf[32]; + struct gpio_pin *pin; + struct gpio_pin *pins; + + snprintf(buf,sizeof buf,"AP%d_",port_index+1); + + /* Find all the GPIO pins for this port and + * free them all. + */ + log_debug("mtac_clear_port_pins: State of mtac mutex is %d",(*(int *)(&mtac_mutex.count))); + mutex_lock(&mtac_mutex); + pins = mtac_port_info[port_index]->gpio_pins; + for (pin = pins; *pin->name; pin++) { + if (!memcmp(pin->name,buf,strlen(buf))) { + gpio_free(pin->pin.gpio); + } + } + mtac_port_info[port_index]->gpio_pins = NULL; + log_debug("Unlock mtac_mutex"); + mutex_unlock(&mtac_mutex); +} +EXPORT_SYMBOL(mtac_clear_port_pins); + +void mtac_set_port_pins(int port_index, struct gpio_pin *pins, struct kobject *subdir) +{ + log_debug("mtac_set_port_pins: State of mtac mutex is %d",(*(int *)(&mtac_mutex.count))); + mtac_port_info[port_index]->gpio_pins = pins; + mtac_port_info[port_index]->subdirs = subdir; +} +EXPORT_SYMBOL(mtac_set_port_pins); + +struct kobj_attribute* mtac_create_attribute(const char* _name, umode_t _mode) { + char* attr_name; + struct kobj_attribute* _attr; + + _attr = kzalloc(sizeof(struct kobj_attribute), GFP_KERNEL); + if (! _attr) { + log_error("kzalloc of attribute [%s] failed", _name); + return NULL; + } + sysfs_attr_init(_attr); + attr_name = kstrdup(_name, GFP_KERNEL); + if (! attr_name) { + log_error("GFP_KERNEL dup failed for attribute [%s]", _name); + return NULL; + } + _attr->attr.name = attr_name; + _attr->attr.mode = _mode; + + return _attr; +} +EXPORT_SYMBOL(mtac_create_attribute); + +int mtac_port_from_kobject(struct kobject *kobj) { + int port; + const char *name; + + name = kobj->name; + if (! name) { + log_error("kobject->name is NULL"); + return -1; + } + + if (sscanf(name, "ap%d", &port) < 1) { + log_error("failed to scan port from kobject->name [%s]", name); + return -1; + } + + if (port < 1 || port > NUM_AP) { + log_error("port number %d is invalid", port); + return -1; + } + + return port; +} +EXPORT_SYMBOL(mtac_port_from_kobject); + + +/* +* This function is not normally used directly by mtac modules. +*/ +ssize_t mtac_show_product_info(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { + ssize_t value; + int port; + int port_index; + struct mts_ap_eeprom_layout *app; + + port = mtac_port_from_kobject(kobj); + if (port < 1) { + log_error("mtac_port_from_kobject returned %d", port); + return -1; + } + port_index = port - 1; + + app = (struct mts_ap_eeprom_layout *)mts_ap_eeprom[port_index]; + if (! strcmp(attr->attr.name, "vendor-id")) { + value = snprintf(buf, 32, "%s\n", app->vendor_id); + } else if (! strcmp(attr->attr.name, "product-id")) { + value = snprintf(buf, 32, "%s\n", app->product_id); + } else if (! strcmp(attr->attr.name, "device-id")) { + value = snprintf(buf, 32, "%s\n", app->device_id); + } else if (! strcmp(attr->attr.name, "hw-version")) { + value = snprintf(buf, 32, "%s\n", app->hw_version); + } else { + log_error("attribute [%s] not found", attr->attr.name); + value = -1; + } + return value; +} +EXPORT_SYMBOL(mtac_show_product_info); + +bool mtac_add_product_info_attributes(int port, struct attribute** attrs, int* index) { + char buf[32]; + struct kobj_attribute* kobj_attr; + + sprintf(buf, "vendor-id"); + kobj_attr = mtac_create_attribute(buf, MTS_ATTR_MODE_RO); + if (! kobj_attr) { + log_error("failed to create attribute [%s] in port %d", buf, port); + return false; + } + kobj_attr->show = mtac_show_product_info; + attrs[(*index)++] = &kobj_attr->attr; + + sprintf(buf, "product-id"); + kobj_attr = mtac_create_attribute(buf, MTS_ATTR_MODE_RO); + if (! kobj_attr) { + log_error("failed to create attribute [%s] in port %d", buf, port); + return false; + } + kobj_attr->show = mtac_show_product_info; + attrs[(*index)++] = &kobj_attr->attr; + + sprintf(buf, "device-id"); + kobj_attr = mtac_create_attribute(buf, MTS_ATTR_MODE_RO); + if (! kobj_attr) { + log_error("failed to create attribute [%s] in port %d", buf, port); + return false; + } + kobj_attr->show = mtac_show_product_info; + attrs[(*index)++] = &kobj_attr->attr; + + sprintf(buf, "hw-version"); + kobj_attr = mtac_create_attribute(buf, MTS_ATTR_MODE_RO); + if (! kobj_attr) { + log_error("failed to create attribute [%s] in port %d", buf, port); + return false; + } + kobj_attr->show = mtac_show_product_info; + attrs[(*index)++] = &kobj_attr->attr; + + return true; +} +EXPORT_SYMBOL(mtac_add_product_info_attributes); + + +/* +* This function is not normally used directly by mtac modules. +*/ +struct gpio_pin *mtac_gpio_pin_by_attr_name(const char *name, int port) { + struct gpio_pin *pin; + char *pin_attr_name; + int port_index = port - 1; + struct gpio_pin *port_gpio_pins; + + log_debug("mtac_gpio_pin_by_attr_name: State of mtac mutex is %d",(*(int *)(&mtac_mutex.count))); + mutex_lock(&mtac_mutex); + pin_attr_name = mtac_port_info[port_index]->gpio_pin_name_by_attr_name(name, port); + port_gpio_pins = mtac_port_info[port_index]->gpio_pins; + + for (pin = port_gpio_pins; *pin->name; pin++) { + if (!strcmp(pin->pin.label, pin_attr_name)) { + mutex_unlock(&mtac_mutex); + return pin; + } + } + mutex_unlock(&mtac_mutex); + + log_error("pin with attr name [%s] not found", name); + return NULL; +} +EXPORT_SYMBOL(mtac_gpio_pin_by_attr_name); + +ssize_t mtac_attr_show_ap_gpio_pin(struct kobject *kobj, + struct kobj_attribute *attr, + char *buf) +{ + int value; + int port; + struct gpio_pin *pin; + + port = mtac_port_from_kobject(kobj); + if (port < 1) { + log_error("mtac_port_from_kobject returned %d", port); + return -EINVAL; + } + + pin = mtac_gpio_pin_by_attr_name(attr->attr.name, port); + if (!pin) { + return -ENODEV; + } + + log_debug("mtac_attr_show_ap_gpio_pin: State of mtac mutex is %d",(*(int *)(&mtac_mutex.count))); + mutex_lock(&mtac_mutex); + + value = gpio_get_value(pin->pin.gpio); + + mutex_unlock(&mtac_mutex); + + if (value < 0) { + return value; + } + + if (pin->active_low) { + value = !value; + } + + return sprintf(buf, "%d\n", value); +} +EXPORT_SYMBOL(mtac_attr_show_ap_gpio_pin); + + +ssize_t mtac_attr_store_ap_gpio_pin(struct kobject *kobj, + struct kobj_attribute *attr, const char *buf, size_t count) +{ + int value; + int port; + struct gpio_pin *pin; + + port = mtac_port_from_kobject(kobj); + if (port < 1) { + log_error("mtac_port_from_kobject returned %d", port); + return -EINVAL; + } + + pin = mtac_gpio_pin_by_attr_name(attr->attr.name, port); + if (!pin) { + return -ENODEV; + } + + if (sscanf(buf, "%i", &value) != 1) { + return -EINVAL; + } + + if (pin->active_low) { + value = !value; + } + + log_debug("mtac_attr_store_ap_gpio_pin: State of mtac mutex is %d",(*(int *)(&mtac_mutex.count))); + mutex_lock(&mtac_mutex); + + gpio_set_value(pin->pin.gpio, value); + + mutex_unlock(&mtac_mutex); + + return count; +} +EXPORT_SYMBOL(mtac_attr_store_ap_gpio_pin); + +static void display_port(int port_index) { + int port = port_index + 1; + struct mts_ap_eeprom_layout *app; + + + /* Our caller has locked the mtac_mutex */ + if((*(int *)(&mtac_mutex.count)) != 0) { + log_error("Must always hold the mtac_mutex here, count is %d not 0",(*(int *)(&mtac_mutex.count))); + } + + app = (struct mts_ap_eeprom_layout *)mts_ap_eeprom[port_index]; + + log_info("accessory card %d vendor-id: %.32s", port, app->vendor_id); + log_info("accessory card %d product-id: %.32s", port, app->product_id); + log_info("accessory card %d device-id: %.32s", port, app->device_id); + log_info("accessory card %d hw-version: %.32s", port, app->hw_version); +} + +static void acquire_gpio(struct gpio_pin *pins, int port_index) +{ + char buf[32]; + struct gpio_pin *pin; + int ret; + + snprintf(buf,sizeof buf,"AP%d_",port_index+1); + for (pin = pins; *pin->name; pin++) { + if (!memcmp(pin->name,buf,strlen(buf))) { + log_debug("Request name:%s label: %s pin: %d", pin->name, pin->pin.label, pin->pin.gpio); + ret = gpio_request_one(pin->pin.gpio, pin->pin.flags, pin->pin.label); + if (ret) + log_debug("could not request pin %s (%d) but it could have already been requested under a different pin name", pin->name, ret); + } + } +} + +#include <linux/delay.h> + +struct gpio_pin *mtac_gpio_pin_by_name(const char *name, int port_index) { + struct gpio_pin *pin; + + log_debug("mtac_gpio_pin_by_name: State of mtac mutex is %d",(*(int *)(&mtac_mutex.count))); + mutex_lock(&mtac_mutex); + for (pin = mtac_port_info[port_index]->gpio_pins; *pin->name; pin++) { + if (!strcmp(pin->name, name)) { + mutex_unlock(&mtac_mutex); + return pin; + } + } + mutex_unlock(&mtac_mutex); + + log_error("pin named %s not found", name); + + return NULL; +} +EXPORT_SYMBOL(mtac_gpio_pin_by_name); + + +/* static gpio_pins */ +// A GPIO pin number must only occur once. +struct gpio_pin *mtac_gpio_pin_by_num(unsigned num, int port_index) { + int ipin = 0; + struct gpio_pin *port_gpio_pins; + + log_debug("mtac_gpio_pin_by_num: State of mtac mutex is %d",(*(int *)(&mtac_mutex.count))); + mutex_lock(&mtac_mutex); + port_gpio_pins = mtac_port_info[port_index]->gpio_pins; + while(*(port_gpio_pins[ipin].name)) { + if (port_gpio_pins[ipin].pin.gpio == num) { + mutex_unlock(&mtac_mutex); + return &(port_gpio_pins[ipin]); + } + ipin++; + } + mutex_unlock(&mtac_mutex); + log_error("pin numbered %u not found", num); + + return NULL; +} +EXPORT_SYMBOL(mtac_gpio_pin_by_num); + +/* +* Depends on static gpio_pins +*/ +int mtac_find(void(*set_info)(struct ap_info* info), const char *target_product_id) +{ + int port_index; + struct mts_ap_eeprom_layout *app; + int slot_count = 0; + + for (port_index = 0; port_index < NUM_AP; port_index++) { + log_debug("mtac_find: State of mtac mutex is %d",(*(int *)(&mtac_mutex.count))); + mutex_lock(&mtac_mutex); + if (mtac_port_info[port_index] != NULL) { + log_debug("Accessory Port %d of %d is in use",port_index+1,NUM_AP); + mutex_unlock(&mtac_mutex); + continue; + } + app = (struct mts_ap_eeprom_layout *)mts_ap_eeprom[port_index]; + log_debug("target_product_id=%s, eeprom=%s",target_product_id,app->product_id); + if (mts_ap_eeprom[port_index][0] == 0xFF) { + log_info("uninitialized eeprom on accessory card %d", port_index); + mutex_unlock(&mtac_mutex); + continue; + } else if (mts_ap_eeprom[port_index][0] == 0x0) { + log_debug("no accessory card inserted in port %d", port_index); + mutex_unlock(&mtac_mutex); + continue; + } else if (strstr(app->product_id, target_product_id)) { + log_debug("strstr matches"); + mtac_port_info[port_index] = kzalloc(sizeof(struct ap_info), GFP_KERNEL); + if (! mtac_port_info[port_index]) { + log_error("alloc of port info failed"); + mutex_unlock(&mtac_mutex); + return -ENOSPC; + } + set_info(mtac_port_info[port_index]); + if (! mtac_port_info[port_index]->setup(port_index+1)) { + log_error("accessory port %d setup failed", port_index+1); + mtac_port_info[port_index]->teardown(port_index+1); + kfree(mtac_port_info[port_index]); + mtac_port_info[port_index] = NULL; + mutex_unlock(&mtac_mutex); + return -ENOSPC; + } else { + acquire_gpio(mtac_port_info[port_index]->gpio_pins,port_index); + slot_count++; + log_debug("slot_count=%d",slot_count); + } + } else + log_debug("len prod_id: %d eeprom pr id: %d",strlen(target_product_id),strlen(app->product_id)); + mutex_unlock(&mtac_mutex); + } + return slot_count; +} +EXPORT_SYMBOL(mtac_find); + +/* +* Display the EEPROM for all the slots. +*/ +static int __init mtac_init(void) +{ + int port_index; + + log_debug("init: " DRIVER_VERSION); + mutex_lock(&mtac_mutex); + for (port_index = 0; port_index < NUM_AP; port_index++) { + if (mts_ap_eeprom[port_index][0] == 0xFF) + log_alert("uninitialized eeprom on accessory card %d", port_index); + else if (mts_ap_eeprom[port_index][0] == 0x0) + log_info("no accessory card inserted in port %d", port_index+1); + else + display_port(port_index); + } + mutex_unlock(&mtac_mutex); + + return 0; +} + +/* We can only tear down our own device */ +static void __exit mtac_exit(void) +{ + log_info("exiting"); +} +module_init(mtac_init); +module_exit(mtac_exit); + +MODULE_AUTHOR(DRIVER_AUTHOR); +MODULE_DESCRIPTION(DRIVER_DESC); +MODULE_VERSION(DRIVER_VERSION); +MODULE_LICENSE("GPL"); |