| #include <linux/device.h> |
| #include <linux/err.h> |
| #include <linux/gpio.h> |
| #include <linux/i2c.h> |
| #include <linux/init.h> |
| #include <linux/kernel.h> |
| #include <linux/platform_device.h> |
| #include <linux/sysfs.h> |
| |
| #define BOARD_NAME "gflt200" |
| #define GPIO_BOARD_VER_0 13 |
| #define GPIO_BOARD_VER_1 15 |
| #define GPIO_BOARD_VER_2 18 |
| |
| static ssize_t board_hw_ver_show(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| int hw_ver = gpio_get_value(GPIO_BOARD_VER_0) |
| | (gpio_get_value(GPIO_BOARD_VER_1) << 1) |
| | (gpio_get_value(GPIO_BOARD_VER_2) << 2); |
| |
| return sprintf(buf, "%d\n", hw_ver); |
| } |
| |
| static DEVICE_ATTR(hw_ver, S_IRUGO, board_hw_ver_show, NULL); |
| |
| static struct i2c_board_info board_i2c_devices[] = { |
| { |
| I2C_BOARD_INFO("pcf8523", 0x68), |
| }, |
| }; |
| |
| int __init board_init(void) |
| { |
| int rc; |
| struct platform_device *pdev; |
| |
| /* /sys/devices/platform/<board_name> */ |
| pdev = platform_device_register_simple(BOARD_NAME, -1, NULL, 0); |
| if (IS_ERR(pdev)) { |
| rc = PTR_ERR(pdev); |
| pr_err(BOARD_NAME ": error %d registering device\n", rc); |
| return rc; |
| } |
| |
| /* /sys/devices/platform/board -> /sys/devices/platform/<board_name> */ |
| rc = sysfs_create_link(&pdev->dev.parent->kobj, &pdev->dev.kobj, |
| "board"); |
| if (rc) |
| pr_err(BOARD_NAME ": error %d creating link 'board'\n", rc); |
| |
| /* /sys/devices/platform/board/hw_ver */ |
| rc = device_create_file(&pdev->dev, &dev_attr_hw_ver); |
| if (rc) |
| pr_err(BOARD_NAME ": error %d creating attribute 'hw_ver'\n", |
| rc); |
| |
| rc = i2c_register_board_info(0, board_i2c_devices, |
| ARRAY_SIZE(board_i2c_devices)); |
| if (rc) |
| pr_err(BOARD_NAME ": error %d registering board I2C devices\n", |
| rc); |
| |
| return 0; |
| } |
| |
| device_initcall(board_init); |