diff options
Diffstat (limited to 'drivers/i2c/algos/i2c-algo-sgi.c')
| -rw-r--r-- | drivers/i2c/algos/i2c-algo-sgi.c | 179 |
1 files changed, 0 insertions, 179 deletions
diff --git a/drivers/i2c/algos/i2c-algo-sgi.c b/drivers/i2c/algos/i2c-algo-sgi.c deleted file mode 100644 index 6eaf145e1ad..00000000000 --- a/drivers/i2c/algos/i2c-algo-sgi.c +++ /dev/null @@ -1,179 +0,0 @@ -/* - * i2c-algo-sgi.c: i2c driver algorithm used by the VINO (SGI Indy) and - * MACE (SGI O2) chips. - * - * This file is subject to the terms and conditions of the GNU General Public - * License version 2 as published by the Free Software Foundation. - * - * Copyright (C) 2003 Ladislav Michl <ladis@linux-mips.org> - */ - -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/init.h> -#include <linux/errno.h> -#include <linux/delay.h> - -#include <linux/i2c.h> -#include <linux/i2c-algo-sgi.h> - - -#define SGI_I2C_FORCE_IDLE (0 << 0) -#define SGI_I2C_NOT_IDLE (1 << 0) -#define SGI_I2C_WRITE (0 << 1) -#define SGI_I2C_READ (1 << 1) -#define SGI_I2C_RELEASE_BUS (0 << 2) -#define SGI_I2C_HOLD_BUS (1 << 2) -#define SGI_I2C_XFER_DONE (0 << 4) -#define SGI_I2C_XFER_BUSY (1 << 4) -#define SGI_I2C_ACK (0 << 5) -#define SGI_I2C_NACK (1 << 5) -#define SGI_I2C_BUS_OK (0 << 7) -#define SGI_I2C_BUS_ERR (1 << 7) - -#define get_control() adap->getctrl(adap->data) -#define set_control(val) adap->setctrl(adap->data, val) -#define read_data() adap->rdata(adap->data) -#define write_data(val) adap->wdata(adap->data, val) - - -static int wait_xfer_done(struct i2c_algo_sgi_data *adap) -{ - int i; - - for (i = 0; i < adap->xfer_timeout; i++) { - if ((get_control() & SGI_I2C_XFER_BUSY) == 0) - return 0; - udelay(1); - } - - return -ETIMEDOUT; -} - -static int wait_ack(struct i2c_algo_sgi_data *adap) -{ - int i; - - if (wait_xfer_done(adap)) - return -ETIMEDOUT; - for (i = 0; i < adap->ack_timeout; i++) { - if ((get_control() & SGI_I2C_NACK) == 0) - return 0; - udelay(1); - } - - return -ETIMEDOUT; -} - -static int force_idle(struct i2c_algo_sgi_data *adap) -{ - int i; - - set_control(SGI_I2C_FORCE_IDLE); - for (i = 0; i < adap->xfer_timeout; i++) { - if ((get_control() & SGI_I2C_NOT_IDLE) == 0) - goto out; - udelay(1); - } - return -ETIMEDOUT; -out: - if (get_control() & SGI_I2C_BUS_ERR) - return -EIO; - return 0; -} - -static int do_address(struct i2c_algo_sgi_data *adap, unsigned int addr, - int rd) -{ - if (rd) - set_control(SGI_I2C_NOT_IDLE); - /* Check if bus is idle, eventually force it to do so */ - if (get_control() & SGI_I2C_NOT_IDLE) - if (force_idle(adap)) - return -EIO; - /* Write out the i2c chip address and specify operation */ - set_control(SGI_I2C_HOLD_BUS | SGI_I2C_WRITE | SGI_I2C_NOT_IDLE); - if (rd) - addr |= 1; - write_data(addr); - if (wait_ack(adap)) - return -EIO; - return 0; -} - -static int i2c_read(struct i2c_algo_sgi_data *adap, unsigned char *buf, - unsigned int len) -{ - int i; - - set_control(SGI_I2C_HOLD_BUS | SGI_I2C_READ | SGI_I2C_NOT_IDLE); - for (i = 0; i < len; i++) { - if (wait_xfer_done(adap)) - return -EIO; - buf[i] = read_data(); - } - set_control(SGI_I2C_RELEASE_BUS | SGI_I2C_FORCE_IDLE); - - return 0; - -} - -static int i2c_write(struct i2c_algo_sgi_data *adap, unsigned char *buf, - unsigned int len) -{ - int i; - - /* We are already in write state */ - for (i = 0; i < len; i++) { - write_data(buf[i]); - if (wait_ack(adap)) - return -EIO; - } - return 0; -} - -static int sgi_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs, - int num) -{ - struct i2c_algo_sgi_data *adap = i2c_adap->algo_data; - struct i2c_msg *p; - int i, err = 0; - - for (i = 0; !err && i < num; i++) { - p = &msgs[i]; - err = do_address(adap, p->addr, p->flags & I2C_M_RD); - if (err || !p->len) - continue; - if (p->flags & I2C_M_RD) - err = i2c_read(adap, p->buf, p->len); - else - err = i2c_write(adap, p->buf, p->len); - } - - return (err < 0) ? err : i; -} - -static u32 sgi_func(struct i2c_adapter *adap) -{ - return I2C_FUNC_SMBUS_EMUL; -} - -static const struct i2c_algorithm sgi_algo = { - .master_xfer = sgi_xfer, - .functionality = sgi_func, -}; - -/* - * registering functions to load algorithms at runtime - */ -int i2c_sgi_add_bus(struct i2c_adapter *adap) -{ - adap->algo = &sgi_algo; - - return i2c_add_adapter(adap); -} -EXPORT_SYMBOL(i2c_sgi_add_bus); - -MODULE_AUTHOR("Ladislav Michl <ladis@linux-mips.org>"); -MODULE_DESCRIPTION("I2C-Bus SGI algorithm"); -MODULE_LICENSE("GPL"); |