diff options
Diffstat (limited to 'mtac_lora.c')
| -rw-r--r-- | mtac_lora.c | 415 |
1 files changed, 415 insertions, 0 deletions
diff --git a/mtac_lora.c b/mtac_lora.c new file mode 100644 index 0000000..7283d7e --- /dev/null +++ b/mtac_lora.c @@ -0,0 +1,415 @@ +#define DRIVER_VERSION "v1.0.0" +#define DRIVER_AUTHOR "John Klug <john.klug@multitech.com>" +#define DRIVER_DESC "MTS Multi-Fuction Serial Accessory Card" +#define DRIVER_NAME "mtac-lora" + +#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/mtac.h> +#include <linux/mts_io.h> + +static struct gpio_pin gpio_pins_mtcdt_mtac_lora_0_0[] = { + // gpio pins for Accessory Card 1 + { + .name = "AP1_RESET", + .pin = { + .gpio = AT91_PIN_PB12, + .flags = GPIOF_OUT_INIT_HIGH, + .label = "ap1-reset", + } + }, + + // gpio pins for Accessory Card 2 + { + .name = "AP2_RESET", + .pin = { + .gpio = AT91_PIN_PB13, + .flags = GPIOF_OUT_INIT_HIGH, + .label = "ap2-reset", + } + }, + { }, +}; + +static struct gpio_pin gpio_pins_mtcdt_mtac_lora_1_5[] = { + // gpio pins for Accessory Card 1 + { + .name = "AP1_RESET", + .pin = { + .gpio = AT91_PIN_PB12, + .flags = GPIOF_OUT_INIT_HIGH, + .label = "ap1-reset", + } + }, + { + .name = "AP1_CDONE", + .pin = { + .gpio = AT91_PIN_PC6, + .flags = GPIOF_IN, + .label = "ap1-cdone", + }, + .active_low = 1, + }, + { + .name = "AP1_CRESET", + .pin = { + .gpio = AT91_PIN_PC7, + .flags = GPIOF_OUT_INIT_HIGH, + .label = "ap1-creset", + } + }, + + // gpio pins for Accessory Card 2 + { + .name = "AP2_RESET", + .pin = { + .gpio = AT91_PIN_PB13, + .flags = GPIOF_OUT_INIT_HIGH, + .label = "ap2-reset", + } + }, + { + .name = "AP2_CDONE", + .pin = { + .gpio = AT91_PIN_PC20, + .flags = GPIOF_OUT_INIT_LOW, + .label = "ap2-cdone", + }, + .active_low = 1, + }, + { + .name = "AP2_CRESET", + .pin = { + .gpio = AT91_PIN_PC21, + .flags = GPIOF_OUT_INIT_LOW, + .label = "ap2-creset", + } + }, + { }, +}; + +ssize_t lora_show_eui(struct kobject *kobj, struct kobj_attribute *attr, char *buf) +{ + int retval = -1; + 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, "eui")) { + retval = sprintf(buf, "%02X:%02X:%02X:%02X:%02X:%02X:%02X:%02X\n", + app->eui[0], + app->eui[1], + app->eui[2], + app->eui[3], + app->eui[4], + app->eui[5], + app->eui[6], + app->eui[7]); + } + return retval; +} + + +static char* lora_gpio_pin_name_by_attr_name(const char* name, int port) { + switch (port) { + case port_1: + if (! strcmp(name, "reset")) { + return "ap1-reset"; + } else if (!strcmp(name,"cdone")) { + return "ap1-cdone"; + } else if (!strcmp(name,"creset")) { + return "ap1-creset"; + } else { + log_error("attribute name [%s] is invalid for LORA in port %d", name, port); + return ""; + } + + case port_2: + if (! strcmp(name, "reset")) { + return "ap2-reset"; + } else if (!strcmp(name,"cdone")) { + return "ap2-cdone"; + } else if (!strcmp(name,"creset")) { + return "ap2-creset"; + } else { + log_error("attribute name [%s] is invalid for LORA in port %d", name, port); + return ""; + } + } + /* NOTREACHED */ + return ""; +} + +// 1 cdone (optional) +// 1 creset (optional) +// 1 eui +// 1 reset +// 1 vendor-id +// 1 product-id +// 1 device-id +// 1 hw-version +// NULL + +#define ATTRS_SIZE_1_5 9 +#define ATTRS_SIZE_0_0 7 + +// Set the hardware version if the ROM string matches one of the valid +// hardware versions. +// Lengths of strings must be the same for a match, then can compare +// text. Without a length check a subset of a string could be a match. +#define COMPARE_AND_ASSIGN(CANDIDATE) ((hw_version_len == (sizeof(HW_VERSION_ ## CANDIDATE)-1)) && \ + (strncmp(ap_eeprom->hw_version, HW_VERSION_ ## CANDIDATE, sizeof(HW_VERSION_ ## CANDIDATE)) == 0)) \ + lora_hw_version = CANDIDATE; + +static bool lora_setup(enum ap port) { + int i; + int port_index = port - 1; + int index = 0; + int count = 0; + int ret; + char buf[32]; + struct kobj_attribute* attr; + struct attribute **attrs; + int lora_hw_version; + int hw_version_len; + int ap_lora_attrs_size; + struct mts_ap_eeprom_layout *ap_eeprom; + struct kobject *subdir; + + ap_eeprom = (struct mts_ap_eeprom_layout *)mts_ap_eeprom[port_index]; + + log_info("loading LORA accessory card in port %d hw: version %s", port, ap_eeprom->hw_version); + + sprintf(buf, "ap%d", port); + subdir = kobject_create_and_add(buf, &mts_io_platform_device->dev.kobj); + if (! subdir) { + log_error("kobject_create_and_add in port %d failed", port); + return false; + } + + // create the link to the apX directory this card is in + // if we're in the first slot, we get plain "lora" + // if we're in a different slot, we might need to use "lora-2" to differentiate + if (port > 1) { + for (i = 1; i < port; i++) { + if (mtac_port_info[i - 1]) { + if (strstr(mtac_port_info[i - 1]->product_id, PRODUCT_ID_MTAC_LORA)) { + count++; + } + } + } + } + if (count > 0) { + sprintf(buf, "lora-%d", count + 1); + } else { + sprintf(buf, "lora"); + } + ret = sysfs_create_link(subdir->parent, subdir, buf); + if (ret) { + log_error("failed to link [%s] to [%s], %d", buf, subdir->name, ret); + } else + log_info("created link [%s] to [%s], success:%d", buf, subdir->name, ret); + + + // hw_version string length, null character not counted. + hw_version_len = strnlen(ap_eeprom->hw_version,sizeof ap_eeprom->hw_version); + + /* Set LoRa hardware version. */ + if COMPARE_AND_ASSIGN(MTAC_LORA_0_0) + else if COMPARE_AND_ASSIGN(MTAC_LORA_1_0) + else if COMPARE_AND_ASSIGN(MTAC_LORA_1_5) + else { + log_error("Unknown hw-version in port %d", port); + return false; + } + + if ((lora_hw_version == MTAC_LORA_0_0) || (lora_hw_version == MTAC_LORA_1_0)) { + ap_lora_attrs_size = ATTRS_SIZE_0_0; + mtac_set_port_pins(port_index,gpio_pins_mtcdt_mtac_lora_0_0,subdir); + } else { + ap_lora_attrs_size = ATTRS_SIZE_1_5; + mtac_set_port_pins(port_index,gpio_pins_mtcdt_mtac_lora_1_5,subdir); + } + + + attrs = kzalloc(sizeof(struct attribute*) * ap_lora_attrs_size, GFP_KERNEL); + if (! attrs) { + log_error("failed to allocate attribute space for port %d", port); + return false; + } + log_debug("Allocated %d attrs @ %p",ap_lora_attrs_size,attrs); + + + sprintf(buf, "reset"); + attr = mtac_create_attribute(buf, MTS_ATTR_MODE_RW); + if (! attr) { + log_error("failed to create attribute [%s] for LORA in port %d", buf, port); + kfree(attrs); + return false; + } + attr->show = mtac_attr_show_ap_gpio_pin; + attr->store = mtac_attr_store_ap_gpio_pin; + attrs[index++] = &attr->attr; + + if (lora_hw_version == MTAC_LORA_1_5) { + //GPIO1 - cdone on FPGA - input to CPU + sprintf(buf, "cdone"); + attr = mtac_create_attribute(buf, MTS_ATTR_MODE_RO); + if (! attr) { + log_error("failed to create attribute [%s] for LORA in port %d", buf, port); + attrs[index] = NULL; + mtac_port_info[port_index]->attr_group.attrs = attrs; + return false; + } + attr->show = mtac_attr_show_ap_gpio_pin; + attrs[index++] = &attr->attr; + + //GPIO2 reset on FPGA - output from CPU + sprintf(buf, "creset"); + attr = mtac_create_attribute(buf, MTS_ATTR_MODE_RW); + if (! attr) { + log_error("failed to create attribute [%s] for LORA in port %d", buf, port); + attrs[index] = NULL; + mtac_port_info[port_index]->attr_group.attrs = attrs; + return false; + } + attr->show = mtac_attr_show_ap_gpio_pin; + attr->store = mtac_attr_store_ap_gpio_pin; + attrs[index++] = &attr->attr; + if(index >= ap_lora_attrs_size) { + panic("Internal error, too many attributes on the LORA card index %d >= %d", + index,ap_lora_attrs_size); + } + } + + sprintf(buf,"eui"); + attr = mtac_create_attribute("eui", MTS_ATTR_MODE_RO); + if (! attr) { + log_error("failed to create attribute [%s] for LORA in port %d", buf, port); + attrs[index] = NULL; + mtac_port_info[port_index]->attr_group.attrs = attrs; + return false; + } + attr->show = lora_show_eui; + attrs[index++] = &attr->attr; + + + // add attributes for eeprom contents + ret = mtac_add_product_info_attributes(port, attrs, &index); + log_debug("Terminate addrs at index %d",index); + attrs[index] = NULL; // Terminate the array. + mtac_port_info[port_index]->attr_group.attrs = attrs; // attrs available for teardown. + + if (!ret) { + log_error("failed to add product info attributes for LORA in port %d", port); + return false; + } + log_debug("mtac_port_info[port_index=%d]->subdirs = %p mtac_port_info[port_index=%d]->attr_group=%p", + port_index,mtac_port_info[port_index]->subdirs,port_index,&mtac_port_info[port_index]->attr_group); + if (sysfs_create_group(mtac_port_info[port_index]->subdirs, &mtac_port_info[port_index]->attr_group)) { + log_error("sysfs_create_group failed for LORA in port %d", port); + return false; + } + + return true; +} + +static bool lora_teardown(enum ap port) { + int port_index = port - 1; + struct attribute **attrs = mtac_port_info[port_index]->attr_group.attrs; + struct attribute *p; + int i; + + log_info("unloading LORA accessory card in port %d", port); + + if(attrs) { + // clean up allocated memory for attributes + for(i=0;attrs[i];i++) { + p = attrs[i]; + if (p->name) + kfree(p->name); + kfree(p); + } + + log_info("kfree %p",attrs); + kfree(attrs); + } + // clean up our "apX/" kobject if it exists + log_info("free up directories"); + if (mtac_port_info[port_index]->subdirs) { + kobject_put(mtac_port_info[port_index]->subdirs); + } + + mtac_clear_port_pins(port_index); + + return true; +} + +void set_lora_info(struct ap_info* info) { + snprintf(info->product_id, 32, "%s", PRODUCT_ID_MTAC_LORA); + info->setup = &lora_setup; + info->teardown = &lora_teardown; + info->gpio_pin_name_by_attr_name = &lora_gpio_pin_name_by_attr_name; +} + +/* + * Loop through all the slots, and set up the + * mtac-lora driver for all slots. + */ +static int __init mtac_lora_init(void) +{ + int slot_count = 0; + + slot_count = mtac_find(set_lora_info,PRODUCT_ID_MTAC_LORA); + + if (slot_count < 1) { + log_debug("No MTAC LORA found"); + if (slot_count < 0) + return slot_count; + else + return -ENXIO; + + } + + return 0; +} + +/* We can only tear down our own device */ +static void __exit mtac_lora_exit(void) +{ + int port_index; + struct mts_ap_eeprom_layout *app; + + for (port_index = 0; port_index < NUM_AP; port_index++) { + app = (struct mts_ap_eeprom_layout *)mts_ap_eeprom[port_index]; + if (app && strstr(app->product_id, PRODUCT_ID_MTAC_LORA)) { + if (mtac_port_info[port_index]->setup == &lora_setup) { + mtac_port_info[port_index]->teardown(port_index+1); + kfree(mtac_port_info[port_index]); + } + } + } + log_info("exiting"); +} + +module_init(mtac_lora_init); +module_exit(mtac_lora_exit); + +MODULE_AUTHOR(DRIVER_AUTHOR); +MODULE_DESCRIPTION(DRIVER_DESC); +MODULE_VERSION(DRIVER_VERSION); +MODULE_LICENSE("GPL"); |