Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 416 insertions, 0 deletions

diff --git a/drivers/char/ds1620.c b/drivers/char/ds1620.c
new file mode 100644
index 000000000000..7def6ad51798
--- /dev/null
+++ b/drivers/char/ds1620.c
@@ -0,0 +1,416 @@
+/*
+ * linux/drivers/char/ds1620.c: Dallas Semiconductors DS1620
+ *   thermometer driver (as used in the Rebel.com NetWinder)
+ */
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/sched.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);
+
+        set_current_state(TASK_INTERRUPTIBLE);
+        schedule_timeout(2);
+}
+
+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 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");