kernel-ark/drivers/char/ds1620.c
Tim Schmielau cd354f1ae7 [PATCH] remove many unneeded #includes of sched.h
After Al Viro (finally) succeeded in removing the sched.h #include in module.h
recently, it makes sense again to remove other superfluous sched.h includes.
There are quite a lot of files which include it but don't actually need
anything defined in there.  Presumably these includes were once needed for
macros that used to live in sched.h, but moved to other header files in the
course of cleaning it up.

To ease the pain, this time I did not fiddle with any header files and only
removed #includes from .c-files, which tend to cause less trouble.

Compile tested against 2.6.20-rc2 and 2.6.20-rc2-mm2 (with offsets) on alpha,
arm, i386, ia64, mips, powerpc, and x86_64 with allnoconfig, defconfig,
allmodconfig, and allyesconfig as well as a few randconfigs on x86_64 and all
configs in arch/arm/configs on arm.  I also checked that no new warnings were
introduced by the patch (actually, some warnings are removed that were emitted
by unnecessarily included header files).

Signed-off-by: Tim Schmielau <tim@physik3.uni-rostock.de>
Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-14 08:09:54 -08:00

414 lines
8.2 KiB
C

/*
* linux/drivers/char/ds1620.c: Dallas Semiconductors DS1620
* thermometer driver (as used in the Rebel.com NetWinder)
*/
#include <linux/module.h>
#include <linux/miscdevice.h>
#include <linux/smp_lock.h>
#include <linux/delay.h>
#include <linux/proc_fs.h>
#include <linux/capability.h>
#include <linux/init.h>
#include <asm/hardware.h>
#include <asm/mach-types.h>
#include <asm/uaccess.h>
#include <asm/therm.h>
#ifdef CONFIG_PROC_FS
/* define for /proc interface */
#define THERM_USE_PROC
#endif
/* Definitions for DS1620 chip */
#define THERM_START_CONVERT 0xee
#define THERM_RESET 0xaf
#define THERM_READ_CONFIG 0xac
#define THERM_READ_TEMP 0xaa
#define THERM_READ_TL 0xa2
#define THERM_READ_TH 0xa1
#define THERM_WRITE_CONFIG 0x0c
#define THERM_WRITE_TL 0x02
#define THERM_WRITE_TH 0x01
#define CFG_CPU 2
#define CFG_1SHOT 1
static const char *fan_state[] = { "off", "on", "on (hardwired)" };
/*
* Start of NetWinder specifics
* Note! We have to hold the gpio lock with IRQs disabled over the
* whole of our transaction to the Dallas chip, since there is a
* chance that the WaveArtist driver could touch these bits to
* enable or disable the speaker.
*/
extern spinlock_t gpio_lock;
extern unsigned int system_rev;
static inline void netwinder_ds1620_set_clk(int clk)
{
gpio_modify_op(GPIO_DSCLK, clk ? GPIO_DSCLK : 0);
}
static inline void netwinder_ds1620_set_data(int dat)
{
gpio_modify_op(GPIO_DATA, dat ? GPIO_DATA : 0);
}
static inline int netwinder_ds1620_get_data(void)
{
return gpio_read() & GPIO_DATA;
}
static inline void netwinder_ds1620_set_data_dir(int dir)
{
gpio_modify_io(GPIO_DATA, dir ? GPIO_DATA : 0);
}
static inline void netwinder_ds1620_reset(void)
{
cpld_modify(CPLD_DS_ENABLE, 0);
cpld_modify(CPLD_DS_ENABLE, CPLD_DS_ENABLE);
}
static inline void netwinder_lock(unsigned long *flags)
{
spin_lock_irqsave(&gpio_lock, *flags);
}
static inline void netwinder_unlock(unsigned long *flags)
{
spin_unlock_irqrestore(&gpio_lock, *flags);
}
static inline void netwinder_set_fan(int i)
{
unsigned long flags;
spin_lock_irqsave(&gpio_lock, flags);
gpio_modify_op(GPIO_FAN, i ? GPIO_FAN : 0);
spin_unlock_irqrestore(&gpio_lock, flags);
}
static inline int netwinder_get_fan(void)
{
if ((system_rev & 0xf000) == 0x4000)
return FAN_ALWAYS_ON;
return (gpio_read() & GPIO_FAN) ? FAN_ON : FAN_OFF;
}
/*
* End of NetWinder specifics
*/
static void ds1620_send_bits(int nr, int value)
{
int i;
for (i = 0; i < nr; i++) {
netwinder_ds1620_set_data(value & 1);
netwinder_ds1620_set_clk(0);
udelay(1);
netwinder_ds1620_set_clk(1);
udelay(1);
value >>= 1;
}
}
static unsigned int ds1620_recv_bits(int nr)
{
unsigned int value = 0, mask = 1;
int i;
netwinder_ds1620_set_data(0);
for (i = 0; i < nr; i++) {
netwinder_ds1620_set_clk(0);
udelay(1);
if (netwinder_ds1620_get_data())
value |= mask;
mask <<= 1;
netwinder_ds1620_set_clk(1);
udelay(1);
}
return value;
}
static void ds1620_out(int cmd, int bits, int value)
{
unsigned long flags;
netwinder_lock(&flags);
netwinder_ds1620_set_clk(1);
netwinder_ds1620_set_data_dir(0);
netwinder_ds1620_reset();
udelay(1);
ds1620_send_bits(8, cmd);
if (bits)
ds1620_send_bits(bits, value);
udelay(1);
netwinder_ds1620_reset();
netwinder_unlock(&flags);
msleep(20);
}
static unsigned int ds1620_in(int cmd, int bits)
{
unsigned long flags;
unsigned int value;
netwinder_lock(&flags);
netwinder_ds1620_set_clk(1);
netwinder_ds1620_set_data_dir(0);
netwinder_ds1620_reset();
udelay(1);
ds1620_send_bits(8, cmd);
netwinder_ds1620_set_data_dir(1);
value = ds1620_recv_bits(bits);
netwinder_ds1620_reset();
netwinder_unlock(&flags);
return value;
}
static int cvt_9_to_int(unsigned int val)
{
if (val & 0x100)
val |= 0xfffffe00;
return val;
}
static void ds1620_write_state(struct therm *therm)
{
ds1620_out(THERM_WRITE_CONFIG, 8, CFG_CPU);
ds1620_out(THERM_WRITE_TL, 9, therm->lo);
ds1620_out(THERM_WRITE_TH, 9, therm->hi);
ds1620_out(THERM_START_CONVERT, 0, 0);
}
static void ds1620_read_state(struct therm *therm)
{
therm->lo = cvt_9_to_int(ds1620_in(THERM_READ_TL, 9));
therm->hi = cvt_9_to_int(ds1620_in(THERM_READ_TH, 9));
}
static ssize_t
ds1620_read(struct file *file, char __user *buf, size_t count, loff_t *ptr)
{
signed int cur_temp;
signed char cur_temp_degF;
cur_temp = cvt_9_to_int(ds1620_in(THERM_READ_TEMP, 9)) >> 1;
/* convert to Fahrenheit, as per wdt.c */
cur_temp_degF = (cur_temp * 9) / 5 + 32;
if (copy_to_user(buf, &cur_temp_degF, 1))
return -EFAULT;
return 1;
}
static int
ds1620_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
{
struct therm therm;
union {
struct therm __user *therm;
int __user *i;
} uarg;
int i;
uarg.i = (int __user *)arg;
switch(cmd) {
case CMD_SET_THERMOSTATE:
case CMD_SET_THERMOSTATE2:
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (cmd == CMD_SET_THERMOSTATE) {
if (get_user(therm.hi, uarg.i))
return -EFAULT;
therm.lo = therm.hi - 3;
} else {
if (copy_from_user(&therm, uarg.therm, sizeof(therm)))
return -EFAULT;
}
therm.lo <<= 1;
therm.hi <<= 1;
ds1620_write_state(&therm);
break;
case CMD_GET_THERMOSTATE:
case CMD_GET_THERMOSTATE2:
ds1620_read_state(&therm);
therm.lo >>= 1;
therm.hi >>= 1;
if (cmd == CMD_GET_THERMOSTATE) {
if (put_user(therm.hi, uarg.i))
return -EFAULT;
} else {
if (copy_to_user(uarg.therm, &therm, sizeof(therm)))
return -EFAULT;
}
break;
case CMD_GET_TEMPERATURE:
case CMD_GET_TEMPERATURE2:
i = cvt_9_to_int(ds1620_in(THERM_READ_TEMP, 9));
if (cmd == CMD_GET_TEMPERATURE)
i >>= 1;
return put_user(i, uarg.i) ? -EFAULT : 0;
case CMD_GET_STATUS:
i = ds1620_in(THERM_READ_CONFIG, 8) & 0xe3;
return put_user(i, uarg.i) ? -EFAULT : 0;
case CMD_GET_FAN:
i = netwinder_get_fan();
return put_user(i, uarg.i) ? -EFAULT : 0;
case CMD_SET_FAN:
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (get_user(i, uarg.i))
return -EFAULT;
netwinder_set_fan(i);
break;
default:
return -ENOIOCTLCMD;
}
return 0;
}
#ifdef THERM_USE_PROC
static int
proc_therm_ds1620_read(char *buf, char **start, off_t offset,
int len, int *eof, void *unused)
{
struct therm th;
int temp;
ds1620_read_state(&th);
temp = cvt_9_to_int(ds1620_in(THERM_READ_TEMP, 9));
len = sprintf(buf, "Thermostat: HI %i.%i, LOW %i.%i; "
"temperature: %i.%i C, fan %s\n",
th.hi >> 1, th.hi & 1 ? 5 : 0,
th.lo >> 1, th.lo & 1 ? 5 : 0,
temp >> 1, temp & 1 ? 5 : 0,
fan_state[netwinder_get_fan()]);
return len;
}
static struct proc_dir_entry *proc_therm_ds1620;
#endif
static const struct file_operations ds1620_fops = {
.owner = THIS_MODULE,
.open = nonseekable_open,
.read = ds1620_read,
.ioctl = ds1620_ioctl,
};
static struct miscdevice ds1620_miscdev = {
TEMP_MINOR,
"temp",
&ds1620_fops
};
static int __init ds1620_init(void)
{
int ret;
struct therm th, th_start;
if (!machine_is_netwinder())
return -ENODEV;
ds1620_out(THERM_RESET, 0, 0);
ds1620_out(THERM_WRITE_CONFIG, 8, CFG_CPU);
ds1620_out(THERM_START_CONVERT, 0, 0);
/*
* Trigger the fan to start by setting
* temperature high point low. This kicks
* the fan into action.
*/
ds1620_read_state(&th);
th_start.lo = 0;
th_start.hi = 1;
ds1620_write_state(&th_start);
msleep(2000);
ds1620_write_state(&th);
ret = misc_register(&ds1620_miscdev);
if (ret < 0)
return ret;
#ifdef THERM_USE_PROC
proc_therm_ds1620 = create_proc_entry("therm", 0, NULL);
if (proc_therm_ds1620)
proc_therm_ds1620->read_proc = proc_therm_ds1620_read;
else
printk(KERN_ERR "therm: unable to register /proc/therm\n");
#endif
ds1620_read_state(&th);
ret = cvt_9_to_int(ds1620_in(THERM_READ_TEMP, 9));
printk(KERN_INFO "Thermostat: high %i.%i, low %i.%i, "
"current %i.%i C, fan %s.\n",
th.hi >> 1, th.hi & 1 ? 5 : 0,
th.lo >> 1, th.lo & 1 ? 5 : 0,
ret >> 1, ret & 1 ? 5 : 0,
fan_state[netwinder_get_fan()]);
return 0;
}
static void __exit ds1620_exit(void)
{
#ifdef THERM_USE_PROC
remove_proc_entry("therm", NULL);
#endif
misc_deregister(&ds1620_miscdev);
}
module_init(ds1620_init);
module_exit(ds1620_exit);
MODULE_LICENSE("GPL");