| /* |
| * Copyright (C) 2007 Sascha Hauer, Pengutronix |
| * 2009 Marc Kleine-Budde <mkl@pengutronix.de> |
| * 2009 Eric Benard <eric@eukrea.com> |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License as |
| * published by the Free Software Foundation; either version 2 of |
| * the License, or (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| * MA 02111-1307 USA |
| * |
| */ |
| |
| #include <common.h> |
| #include <init.h> |
| #include <driver.h> |
| #include <xfuncs.h> |
| #include <errno.h> |
| |
| #include <i2c/i2c.h> |
| |
| #include <asm/byteorder.h> |
| |
| #define DRIVERNAME "lp3972" |
| |
| struct lp_priv { |
| struct cdev cdev; |
| struct i2c_client *client; |
| }; |
| |
| #define to_lp_priv(a) container_of(a, struct lp_priv, cdev) |
| |
| static struct lp_priv *lp_dev; |
| |
| struct i2c_client *lp3972_get_client(void) |
| { |
| if (!lp_dev) |
| return NULL; |
| |
| return lp_dev->client; |
| } |
| |
| static u32 lp_read_reg(struct lp_priv *lp, int reg) |
| { |
| u8 buf; |
| |
| i2c_read_reg(lp->client, reg, &buf, sizeof(buf)); |
| |
| return buf; |
| } |
| |
| static ssize_t lp_read(struct cdev *cdev, void *_buf, size_t count, ulong offset, ulong flags) |
| { |
| struct lp_priv *priv = to_lp_priv(cdev); |
| int i = count; |
| u8 *buf = _buf; |
| |
| while (i) { |
| *buf = lp_read_reg(priv, offset); |
| buf++; |
| i--; |
| offset++; |
| } |
| |
| return count; |
| } |
| |
| static struct file_operations lp_fops = { |
| .lseek = dev_lseek_default, |
| .read = lp_read, |
| }; |
| |
| static int lp_probe(struct device_d *dev) |
| { |
| if (lp_dev) |
| return -EBUSY; |
| |
| lp_dev = xzalloc(sizeof(struct lp_priv)); |
| lp_dev->cdev.name = DRIVERNAME; |
| lp_dev->client = to_i2c_client(dev); |
| lp_dev->cdev.size = 256; |
| lp_dev->cdev.dev = dev; |
| lp_dev->cdev.ops = &lp_fops; |
| |
| devfs_create(&lp_dev->cdev); |
| |
| return 0; |
| } |
| |
| static struct driver_d lp_driver = { |
| .name = DRIVERNAME, |
| .probe = lp_probe, |
| }; |
| |
| static int lp_init(void) |
| { |
| register_driver(&lp_driver); |
| return 0; |
| } |
| |
| device_initcall(lp_init); |