add device class attributes (9.6)week-4

1 files changed, 25 insertions, 23 deletions

diff --git a/driver/platform.c b/driver/platform.c
index 73d691f..b177474 100644
--- a/driver/platform.c
+++ b/driver/platform.c
@@ -42,27 +42,6 @@ int lork_probe(struct platform_device* dev) {
 	}
 	if (am33xx_pinmux == NULL) return EINVAL;
 
-	// TODO: ???
-
-	// // configure gpio mux
-	// uint32_t* conf_gpmc_a3 = ioremap(TI_AM335X_CM_GPMC_A3_ADDR, sizeof(ti_am335x_word_t));
-	// if (conf_gpmc_a3 == NULL)
-	// 	return -EINVAL;
-	// barrier();
-	// uint32_t val = ioread32(conf_gpmc_a3); rmb();
-	// val &= ~0x7;
-	// val |= 0x7;
-	// iowrite32(val, conf_gpmc_a3); wmb();
-	// iounmap(conf_gpmc_a3);
-
-	// // configure output pin
-	// ti_am335x_word_t* gpio1 = ioremap(TI_AM335X_GPIO1_ADDR, GPIO_REG_SIZE);
-	// barrier();
-	// ti_am335x_word_t oe_reg = ioread32(gpio1 + GPIO_OE); rmb();
-	// oe_reg &= ~(1<<PIN); // 0=output
-	// iowrite32(oe_reg, gpio1 + GPIO_OE); wmb();
-	// iounmap(gpio1);
-
 	printk("%s(%s)\n", __PRETTY_FUNCTION__, dev->name);
 	return 0;
 }
@@ -73,11 +52,34 @@ int lork_remove(struct platform_device* dev) {
 }
 
 unsigned int val = 0;
-ssize_t attr_show(struct device_driver* drv, char* buf) {
+ssize_t drv_attr_int_show(struct device_driver* drv, char* buf) {
 	return sprintf(buf, "%u\n", val);
 }
-ssize_t attr_store(struct device_driver* drv, const char* buf, size_t count) {
+ssize_t drv_attr_int_store(struct device_driver* drv, const char* buf, size_t count) {
 	sscanf(buf, "%u", &val);
 	return count;
 }
 
+ssize_t dev_attr_int_show(struct device* dev, struct device_attribute* _attr, char* buf) {
+	return sprintf(buf, "%u\n", val);
+}
+ssize_t dev_attr_int_store(struct device* dev, struct device_attribute* _attr, const char* buf, size_t count) {
+	sscanf(buf, "%u", &val);
+	return count;
+}
+
+char* str = NULL;
+size_t str_len = 0;
+ssize_t dev_attr_str_show(struct device* dev, struct device_attribute* _attr, char* buf) {
+	if (str == NULL) return 0;
+	strncpy(buf, str, str_len);
+	return str_len;
+}
+ssize_t dev_attr_str_store(struct device* dev, struct device_attribute* _attr, const char* buf, size_t count) {
+	if (str != NULL) kfree(str);
+	str = kmalloc(count, 0);
+	str_len = count;
+	strncpy(str, buf, str_len);
+	return count;
+}
+