diff options
Diffstat (limited to 'drivers/media/pci/ddbridge/ddbridge-i2c.h')
| -rw-r--r-- | drivers/media/pci/ddbridge/ddbridge-i2c.h | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/drivers/media/pci/ddbridge/ddbridge-i2c.h b/drivers/media/pci/ddbridge/ddbridge-i2c.h new file mode 100644 index 000000000000..7ed220506c05 --- /dev/null +++ b/drivers/media/pci/ddbridge/ddbridge-i2c.h @@ -0,0 +1,112 @@ +/* + * ddbridge-i2c.c: Digital Devices bridge i2c driver + * + * Copyright (C) 2010-2017 Digital Devices GmbH + * Ralph Metzler <rjkm@metzlerbros.de> + * Marcus Metzler <mocm@metzlerbros.de> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * version 2 only, as published by the Free Software Foundation. + * + * 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. + * + */ + +#ifndef __DDBRIDGE_I2C_H__ +#define __DDBRIDGE_I2C_H__ + +#include <linux/i2c.h> + +#include "ddbridge.h" + +/******************************************************************************/ + +void ddb_i2c_release(struct ddb *dev); +int ddb_i2c_init(struct ddb *dev); + +/******************************************************************************/ + +static int __maybe_unused i2c_io(struct i2c_adapter *adapter, u8 adr, + u8 *wbuf, u32 wlen, u8 *rbuf, u32 rlen) +{ + struct i2c_msg msgs[2] = { { .addr = adr, .flags = 0, + .buf = wbuf, .len = wlen }, + { .addr = adr, .flags = I2C_M_RD, + .buf = rbuf, .len = rlen } }; + + return (i2c_transfer(adapter, msgs, 2) == 2) ? 0 : -1; +} + +static int __maybe_unused i2c_write(struct i2c_adapter *adap, u8 adr, + u8 *data, int len) +{ + struct i2c_msg msg = { .addr = adr, .flags = 0, + .buf = data, .len = len }; + + return (i2c_transfer(adap, &msg, 1) == 1) ? 0 : -1; +} + +static int __maybe_unused i2c_read(struct i2c_adapter *adapter, u8 adr, u8 *val) +{ + struct i2c_msg msgs[1] = { { .addr = adr, .flags = I2C_M_RD, + .buf = val, .len = 1 } }; + + return (i2c_transfer(adapter, msgs, 1) == 1) ? 0 : -1; +} + +static int __maybe_unused i2c_read_regs(struct i2c_adapter *adapter, + u8 adr, u8 reg, u8 *val, u8 len) +{ + struct i2c_msg msgs[2] = { { .addr = adr, .flags = 0, + .buf = ®, .len = 1 }, + { .addr = adr, .flags = I2C_M_RD, + .buf = val, .len = len } }; + + return (i2c_transfer(adapter, msgs, 2) == 2) ? 0 : -1; +} + +static int __maybe_unused i2c_read_regs16(struct i2c_adapter *adapter, + u8 adr, u16 reg, u8 *val, u8 len) +{ + u8 msg[2] = { reg >> 8, reg & 0xff }; + struct i2c_msg msgs[2] = { { .addr = adr, .flags = 0, + .buf = msg, .len = 2 }, + { .addr = adr, .flags = I2C_M_RD, + .buf = val, .len = len } }; + + return (i2c_transfer(adapter, msgs, 2) == 2) ? 0 : -1; +} + +static int __maybe_unused i2c_write_reg16(struct i2c_adapter *adap, + u8 adr, u16 reg, u8 val) +{ + u8 msg[3] = { reg >> 8, reg & 0xff, val }; + + return i2c_write(adap, adr, msg, 3); +} + +static int __maybe_unused i2c_write_reg(struct i2c_adapter *adap, + u8 adr, u8 reg, u8 val) +{ + u8 msg[2] = { reg, val }; + + return i2c_write(adap, adr, msg, 2); +} + +static int __maybe_unused i2c_read_reg16(struct i2c_adapter *adapter, + u8 adr, u16 reg, u8 *val) +{ + return i2c_read_regs16(adapter, adr, reg, val, 1); +} + +static int __maybe_unused i2c_read_reg(struct i2c_adapter *adapter, + u8 adr, u8 reg, u8 *val) +{ + return i2c_read_regs(adapter, adr, reg, val, 1); +} + +#endif /* __DDBRIDGE_I2C_H__ */ |