| /* |
| * Copyright (C) 2007 Sascha Hauer, Pengutronix |
| * 2009 Marc Kleine-Budde <mkl@pengutronix.de> |
| * Copyright (C) 2010 Baruch Siach <baruch@tkos.co.il> |
| * |
| * 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 <mfd/mc34704.h> |
| |
| #define DRIVERNAME "mc34704" |
| |
| #define to_mc34704(a) container_of(a, struct mc34704, cdev) |
| |
| static struct mc34704 *mc34704_dev; |
| |
| struct mc34704 *mc34704_get(void) |
| { |
| if (!mc34704_dev) |
| return NULL; |
| |
| return mc34704_dev; |
| } |
| EXPORT_SYMBOL(mc34704_get); |
| |
| int mc34704_reg_read(struct mc34704 *mc34704, u8 reg, u8 *val) |
| { |
| int ret; |
| |
| ret = i2c_read_reg(mc34704->client, reg, val, 1); |
| |
| return ret == 1 ? 0 : ret; |
| } |
| EXPORT_SYMBOL(mc34704_reg_read) |
| |
| int mc34704_reg_write(struct mc34704 *mc34704, u8 reg, u8 val) |
| { |
| int ret; |
| |
| ret = i2c_write_reg(mc34704->client, reg, &val, 1); |
| |
| return ret == 1 ? 0 : ret; |
| } |
| EXPORT_SYMBOL(mc34704_reg_write) |
| |
| static ssize_t mc34704_read(struct cdev *cdev, void *_buf, size_t count, |
| ulong offset, ulong flags) |
| { |
| struct mc34704 *priv = to_mc34704(cdev); |
| u8 *buf = _buf; |
| size_t i = count; |
| int err; |
| |
| while (i) { |
| err = mc34704_reg_read(priv, offset, buf); |
| if (err) |
| return (ssize_t)err; |
| buf++; |
| i--; |
| offset++; |
| } |
| |
| return count; |
| } |
| |
| static ssize_t mc34704_write(struct cdev *cdev, const void *_buf, size_t count, |
| ulong offset, ulong flags) |
| { |
| struct mc34704 *mc34704 = to_mc34704(cdev); |
| const u8 *buf = _buf; |
| size_t i = count; |
| int err; |
| |
| while (i) { |
| err = mc34704_reg_write(mc34704, offset, *buf); |
| if (err) |
| return (ssize_t)err; |
| buf++; |
| i--; |
| offset++; |
| } |
| |
| return count; |
| } |
| |
| static struct file_operations mc34704_fops = { |
| .lseek = dev_lseek_default, |
| .read = mc34704_read, |
| .write = mc34704_write, |
| }; |
| |
| static int mc34704_probe(struct device_d *dev) |
| { |
| if (mc34704_dev) |
| return -EBUSY; |
| |
| mc34704_dev = xzalloc(sizeof(struct mc34704)); |
| mc34704_dev->cdev.name = DRIVERNAME; |
| mc34704_dev->client = to_i2c_client(dev); |
| mc34704_dev->cdev.size = 256; |
| mc34704_dev->cdev.dev = dev; |
| mc34704_dev->cdev.ops = &mc34704_fops; |
| |
| devfs_create(&mc34704_dev->cdev); |
| |
| return 0; |
| } |
| |
| static struct driver_d mc34704_driver = { |
| .name = DRIVERNAME, |
| .probe = mc34704_probe, |
| }; |
| |
| static int mc34704_init(void) |
| { |
| register_driver(&mc34704_driver); |
| return 0; |
| } |
| device_initcall(mc34704_init); |