tlc59116_linux.zip_Texas_linux led driver_tlc59116

#include <linux/module.h> #include <linux/i2c.h> #include <linux/delay.h> #include <linux/slab.h> #include <linux/tlc59116.h> #define DRIVER_NAME "tlc59116" int tlc59116_write(struct i2c_client *client, u8 addr, u8 data) { u8 buffer[2]; int ret; dev_dbg(&client->dev, "writing %u to i2c address %u\n", (unsigned int) data, (unsigned int) addr); buffer[0] = addr; buffer[1] = data; ret = i2c_master_send(client, buffer, 2); if (ret != 2) { dev_err(&client->dev, "failed to write\n"); if (ret < 0) return ret; else return -EIO; } return 0; } EXPORT_SYMBOL(tlc59116_write); /** * @n Description : Perform a single read (1B) from register * @n Pre-condition : None * @n Constraints : None * @param [in] : Handle to slave device * @param [in] : addr address of register to read * @param [in] : data data read from device * @return : error codes: 0 if ok * * @warning: "data" param is affected only if reading is ok * * @author M.Mondo */ int tlc59116_read(struct i2c_client *client, u8 addr, u8 *data) { u8 buffer_add; u8 buffer_read; int ret; int loc_ret; buffer_add = addr; buffer_read = 0x0U; ret = 0U; /* No errors */ loc_ret = 0U; /* Register set */ loc_ret = i2c_master_send(client, &buffer_add, 1U); if (1U == loc_ret) /* "i2c_master_send" reports numbers of byte send, if ok, otherwise negative value */ { loc_ret = i2c_master_recv(client, &buffer_read, 1U); /* 1 -> num bytes to read */ if (1U == loc_ret) { *data = buffer_read; /* update data read */ } else { ret = 0x01; } } else { ret = 0x02; } return ret; } EXPORT_SYMBOL(tlc59116_read); static void tlc59116_ResetLedDriver(void) { //RESET_OUT_OFF(); //arch_sleep(1); //RESET_OUT_ON(); //arch_sleep(1); } static int tlc59116_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct tlc59116_data *data; int err; data = kzalloc(sizeof(struct tlc59116_data), GFP_KERNEL); if (!data) { err = -ENOMEM; goto exit; } i2c_set_clientdata(client, data); dev_info(&client->dev, "%s (LED DRIVER) chip found...\n", client->name); #if 0 data->attrs.attrs = cy8c9520a_attr; err = sysfs_create_group(&client->dev.kobj, &data->attrs); if (err) goto exit_free; #endif return 0; #if 0 exit_free: kfree(data); #endif exit: return err; } static int tlc59116_remove(struct i2c_client *client) { struct cy8c9520a_data *data = i2c_get_clientdata(client); #if 0 sysfs_remove_group(&client->dev.kobj, &data->attrs); #endif kfree(data); return 0; } static const struct i2c_device_id tlc59116_i2c_id[] = { { "tlc59116", 0 }, { } }; MODULE_DEVICE_TABLE(i2c, tlc59116_i2c_id); static struct i2c_driver tlc59116_i2c_driver = { .driver = { .name = "tlc59116", .owner = THIS_MODULE, }, .probe = tlc59116_probe, .remove = tlc59116_remove, .id_table = tlc59116_i2c_id, }; static int __init tlc59116_i2c_init(void) { printk("MTA: LED_DRIVER init...\n"); return i2c_add_driver(&tlc59116_i2c_driver); } subsys_initcall(tlc59116_i2c_init); static void __exit tlc59116_i2c_exit(void) { i2c_del_driver(&tlc59116_i2c_driver); } module_exit(tlc59116_i2c_exit);