linux-imx

/*

 * Windfarm PowerMac thermal control. LM75 sensor

 *

 * (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp.

 *                    <benh@kernel.crashing.org>

 *

 * Released under the term of the GNU GPL v2.

 */

​

#include <linux/types.h>

#include <linux/errno.h>

#include <linux/kernel.h>

#include <linux/delay.h>

#include <linux/slab.h>

#include <linux/init.h>

#include <linux/wait.h>

#include <linux/i2c.h>

#include <asm/prom.h>

#include <asm/machdep.h>

#include <asm/io.h>

#include <asm/sections.h>

#include <asm/pmac_low_i2c.h>

​

#include "windfarm.h"

​

#define VERSION "1.0"

​

#undef DEBUG

​

#ifdef DEBUG

#define DBG(args...)    printk(args)

#else

#define DBG(args...)    do { } while(0)

#endif

​

struct wf_lm75_sensor {

    int         ds1775 : 1;

    int         inited : 1;

    struct i2c_client   *i2c;

    struct wf_sensor    sens;

};

#define wf_to_lm75(c) container_of(c, struct wf_lm75_sensor, sens)

​

static int wf_lm75_get(struct wf_sensor *sr, s32 *value)

{

    struct wf_lm75_sensor *lm = wf_to_lm75(sr);

    s32 data;

​

    if (lm->i2c == NULL)

        return -ENODEV;

​

    /* Init chip if necessary */

    if (!lm->inited) {

        u8 cfg_new, cfg = (u8)i2c_smbus_read_byte_data(lm->i2c, 1);

​

        DBG("wf_lm75: Initializing %s, cfg was: %02x\n",

            sr->name, cfg);

​

        /* clear shutdown bit, keep other settings as left by

         * the firmware for now

         */

        cfg_new = cfg & ~0x01;

        i2c_smbus_write_byte_data(lm->i2c, 1, cfg_new);