diff options
Diffstat (limited to 'mtac_mfser.c')
| -rw-r--r-- | mtac_mfser.c | 430 |
1 files changed, 430 insertions, 0 deletions
diff --git a/mtac_mfser.c b/mtac_mfser.c new file mode 100644 index 0000000..3f65a77 --- /dev/null +++ b/mtac_mfser.c @@ -0,0 +1,430 @@ +#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-mfser" + +#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_mfser[] = { + // gpio pins for Accessory Card 1 + { + .name = "AP1_GPIO1", + .pin = { + .gpio = AT91_PIN_PC6, + .flags = GPIOF_OUT_INIT_LOW, + .label = "ap1-gpio1", + }, + .active_low = 1, + }, + { + .name = "AP1_GPIO2", + .pin = { + .gpio = AT91_PIN_PC7, + .flags = GPIOF_OUT_INIT_LOW, + .label = "ap1-gpio2", + } + }, + { + .name = "AP1_GPIO3", + .pin = { + .gpio = AT91_PIN_PC8, + .flags = GPIOF_OUT_INIT_LOW, + .label = "ap1-gpio3", + } + }, + { + .name = "AP1_GPIO4", + .pin = { + .gpio = AT91_PIN_PC9, + .flags = GPIOF_OUT_INIT_LOW, + .label = "ap1-gpio4", + } + }, + + + // gpio pins for Accessory Card 2 + { + .name = "AP2_GPIO1", + .pin = { + .gpio = AT91_PIN_PC20, + .flags = GPIOF_OUT_INIT_LOW, + .label = "ap2-gpio1", + }, + .active_low = 1, + }, + { + .name = "AP2_GPIO2", + .pin = { + .gpio = AT91_PIN_PC21, + .flags = GPIOF_OUT_INIT_LOW, + .label = "ap2-gpio2", + } + }, + { + .name = "AP2_GPIO3", + .pin = { + .gpio = AT91_PIN_PC22, + .flags = GPIOF_OUT_INIT_LOW, + .label = "ap2-gpio3", + } + }, + { + .name = "AP2_GPIO4", + .pin = { + .gpio = AT91_PIN_PC23, + .flags = GPIOF_OUT_INIT_LOW, + .label = "ap2-gpio4", + } + }, + { }, +}; + +static char* mfser_gpio_pin_name_by_attr_name(const char* name, int port) { + switch (port) { + case port_1: + if (! strcmp(name, "rs4xx-term-res")) { + return "ap1-gpio3"; + } else if (! strcmp(name, "rts-override")) { + return "ap1-gpio4"; + } else { + log_error("attirbute name [%s] is invalid for MFSER in port %d", name, port); + return ""; + } + + case port_2: + if (! strcmp(name, "rs4xx-term-res")) { + return "ap2-gpio3"; + } else if (! strcmp(name, "rts-override")) { + return "ap2-gpio4"; + } else { + log_error("attirbute name [%s] is invalid for MFSER in port %d", name, port); + return ""; + } + } + return ""; +} + +static ssize_t mts_attr_show_mfser_mode(struct kobject *kobj, + struct kobj_attribute *attr, + char *buf) +{ + int ret; + int port; + int modesel0; + int modesel1; + int port_index; + + struct gpio_pin *pin_modesel0; + struct gpio_pin *pin_modesel1; + + port = mtac_port_from_kobject(kobj); + if (port < 0) { + log_error("mtac_port_from_kobject returned %d", port); + return -EINVAL; + } + + port_index = port - 1; + switch (port) { + case port_1: + pin_modesel0 = mtac_gpio_pin_by_name("AP1_GPIO1",port_index); + pin_modesel1 = mtac_gpio_pin_by_name("AP1_GPIO2",port_index); + break; + + case port_2: + pin_modesel0 = mtac_gpio_pin_by_name("AP2_GPIO1",port_index); + pin_modesel1 = mtac_gpio_pin_by_name("AP2_GPIO2",port_index); + break; + + default: + log_error("unknown serial-mode attr [%s]", attr->attr.name); + return -ENODEV; + } + + if (!pin_modesel0 || !pin_modesel1) + return -ENODEV; + + mutex_lock(&mtac_mutex); + + modesel0 = gpio_get_value(pin_modesel0->pin.gpio); + modesel1 = gpio_get_value(pin_modesel1->pin.gpio); + + if (modesel1 == 0 && modesel0 == 0) + ret = sprintf(buf, "loopback\n"); + else if (modesel1 == 0 && modesel0 == 1) + ret = sprintf(buf, "rs232\n"); + else if (modesel1 == 1 && modesel0 == 0) + ret = sprintf(buf, "rs485-half\n"); + else if (modesel1 == 1 && modesel0 == 1) + ret = sprintf(buf, "rs422-485-full\n"); + else + ret = sprintf(buf, "error\n"); + + mutex_unlock(&mtac_mutex); + + return ret; +} + +static ssize_t mts_attr_store_mfser_mode(struct kobject *kobj, + struct kobj_attribute *attr, const char *buf, size_t count) +{ + int port; + int modesel0; + int modesel1; + struct gpio_pin *pin_modesel0; + struct gpio_pin *pin_modesel1; + int port_index; + + port = mtac_port_from_kobject(kobj); + if (port < 0) { + log_error("mtac_port_from_kobject returned %d", port); + return -EINVAL; + } + + port_index = port - 1; + switch (port) { + case port_1: + pin_modesel0 = mtac_gpio_pin_by_name("AP1_GPIO1",port_index); + pin_modesel1 = mtac_gpio_pin_by_name("AP1_GPIO2",port_index); + break; + + case port_2: + pin_modesel0 = mtac_gpio_pin_by_name("AP2_GPIO1",port_index); + pin_modesel1 = mtac_gpio_pin_by_name("AP2_GPIO2",port_index); + break; + + default: + log_error("unknown serial-mode attr [%s]", attr->attr.name); + return -ENODEV; + } + + if (!pin_modesel0 || !pin_modesel1) + return -ENODEV; + + if (!strcasecmp(buf, "loopback")) { + modesel1 = 0; + modesel0 = 0; + } + else if (!strcasecmp(buf, "rs232")) { + modesel1 = 0; + modesel0 = 1; + } + else if (!strcasecmp(buf, "rs485-half")) { + modesel1 = 1; + modesel0 = 0; + } + else if (!strcasecmp(buf, "rs422-485-full")) { + modesel1 = 1; + modesel0 = 1; + } + else { + return -EINVAL; + } + + mutex_lock(&mtac_mutex); + + gpio_set_value(pin_modesel0->pin.gpio, modesel0); + gpio_set_value(pin_modesel1->pin.gpio, modesel1); + + mutex_unlock(&mtac_mutex); + + return count; +} + +// 1 serial mode +// 1 rs4xx term resistor +// 1 rts override +// 1 vendor-id +// 1 product-id +// 1 device-id +// 1 hw-version +// NULL +static size_t ap_mfser_attrs_size = 8; + +static bool mfser_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; + struct kobject *subdir; + + log_info("loading MFSER accessory card in port %d", port); + + 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 for MFSER in port %d failed", port); + return false; + } + + mtac_set_port_pins(port_index,gpio_pins_mtcdt_mtac_mfser,subdir); + + // create the link to the apX directory this card is in + // if we're in the first slot, we get plain "mfser" + // if we're in a different slot, we might need to use "mfser-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_MFSER)) { + count++; + } + } + } + } + if (count > 0) { + sprintf(buf, "mfser-%d", count + 1); + } else { + sprintf(buf, "mfser"); + } + ret = sysfs_create_link(mtac_port_info[port_index]->subdirs->parent, mtac_port_info[port_index]->subdirs, buf); + if (ret) { + log_error("failed to link [%s] to [%s], %d", buf, mtac_port_info[port_index]->subdirs->name, ret); + } + + attrs = kzalloc(sizeof(struct attribute*) * ap_mfser_attrs_size, GFP_KERNEL); + if (! attrs) { + log_error("failed to allocate attribute space for port %d", port); + return false; + } + + sprintf(buf, "serial-mode"); + attr = mtac_create_attribute(buf, MTS_ATTR_MODE_RW); + if (! attr) { + log_error("failed to create attribute [%s] for MFSER in port %d", buf, port); + return false; + } + attr->show = mts_attr_show_mfser_mode; + attr->store = mts_attr_store_mfser_mode; + attrs[index++] = &attr->attr; + + sprintf(buf, "rs4xx-term-res"); + attr = mtac_create_attribute(buf, MTS_ATTR_MODE_RW); + if (! attr) { + log_error("failed to create attribute [%s] for MFSER in port %d", buf, port); + return false; + } + attr->show = mtac_attr_show_ap_gpio_pin; + attr->store = mtac_attr_store_ap_gpio_pin; + attrs[index++] = &attr->attr; + + sprintf(buf, "rts-override"); + attr = mtac_create_attribute(buf, MTS_ATTR_MODE_RW); + if (! attr) { + log_error("failed to create attribute [%s] for MFSER in port %d", buf, port); + return false; + } + attr->show = mtac_attr_show_ap_gpio_pin; + attr->store = mtac_attr_store_ap_gpio_pin; + attrs[index++] = &attr->attr; + + // add attributes for eeprom contents + if (! mtac_add_product_info_attributes(port, attrs, &index)) { + log_error("failed to add product info attributes for MFSER in port %d", port); + return false; + } + + attrs[index] = NULL; + + mtac_port_info[port_index]->attr_group.attrs = attrs; + if (sysfs_create_group(mtac_port_info[port_index]->subdirs, &mtac_port_info[port_index]->attr_group)) { + log_error("sysfs_create_group failed for MFSER in port %d", port); + return false; + } + + return true; +} + +static bool mfser_teardown(enum ap port) { + int i; + int port_index = port - 1; + struct attribute **attrs = mtac_port_info[port_index]->attr_group.attrs; + + log_info("unloading MFSER accessory card in port %d", port); + + // clean up allocated memory for attributes + for (i = 0; i < ap_mfser_attrs_size; i++) { + if (attrs[i]) { + if (attrs[i]->name) + kfree(attrs[i]->name); + + kfree(attrs[i]); + } + } + + kfree(attrs); + + // clean up our "apX/" kobject if it exists + 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_mfser_info(struct ap_info* info) { + snprintf(info->product_id, 32, "%s", PRODUCT_ID_MTAC_MFSER); + info->setup = &mfser_setup; + info->teardown = &mfser_teardown; + info->gpio_pin_name_by_attr_name = &mfser_gpio_pin_name_by_attr_name; +} + +/* + * Loop through all the slots, and set up the + * mtac-mfser driver for all slots. + */ +static int __init mtac_mfser_init(void) +{ + int slot_count = 0; + + slot_count = mtac_find(set_mfser_info,PRODUCT_ID_MTAC_MFSER); + + if (slot_count < 1) { + log_debug("No MTAC MFSER 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_mfser_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_MFSER)) { + if (mtac_port_info[port_index]->setup == &mfser_setup) { + mtac_port_info[port_index]->teardown(port_index+1); + kfree(mtac_port_info[port_index]); + } + } + } + log_info("exiting"); +} + +module_init(mtac_mfser_init); +module_exit(mtac_mfser_exit); + +MODULE_AUTHOR(DRIVER_AUTHOR); +MODULE_DESCRIPTION(DRIVER_DESC); +MODULE_VERSION(DRIVER_VERSION); +MODULE_LICENSE("GPL"); |