[PATCH] w1: Added DS2433 driver.

Work by Ben Gardner <bgardner@wabtec.com>.

Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

3 files changed, 230 insertions, 0 deletions

diff --git a/drivers/w1/Kconfig b/drivers/w1/Kconfig
index 711b90903e7b..1d5d0872eb4d 100644
--- a/drivers/w1/Kconfig
+++ b/drivers/w1/Kconfig
@@ -54,4 +54,11 @@ config W1_SMEM
           Say Y here if you want to connect 1-wire
           simple 64bit memory rom(ds2401/ds2411/ds1990*) to you wire.
 
+config W1_DS2433
+        tristate "4kb EEPROM family support (DS2433)"
+        depends on W1
+        help
+          Say Y here if you want to use a 1-wire
+          4kb EEPROM family device (DS2433).
+
 endmenu
diff --git a/drivers/w1/Makefile b/drivers/w1/Makefile
index 80725c348e70..d894a9896b18 100644
--- a/drivers/w1/Makefile
+++ b/drivers/w1/Makefile
@@ -18,3 +18,4 @@ ds9490r-objs    := dscore.o
 
 obj-$(CONFIG_W1_DS9490_BRIDGE)  += ds_w1_bridge.o
 
+obj-$(CONFIG_W1_DS2433)         += w1_ds2433.o
diff --git a/drivers/w1/w1_ds2433.c b/drivers/w1/w1_ds2433.c
new file mode 100644
index 000000000000..9ec9163a0a9b
--- /dev/null
+++ b/drivers/w1/w1_ds2433.c
@@ -0,0 +1,222 @@
+/*
+ *      w1_ds2433.c - w1 family 23 (DS2433) driver
+ *
+ * Copyright (c) 2005 Ben Gardner <bgardner@wabtec.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the smems of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/device.h>
+#include <linux/types.h>
+#include <linux/delay.h>
+
+#include "w1.h"
+#include "w1_io.h"
+#include "w1_int.h"
+#include "w1_family.h"
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Ben Gardner <bgardner@wabtec.com>");
+MODULE_DESCRIPTION("w1 family 23 driver for DS2433, 4kb EEPROM");
+
+#define W1_EEPROM_SIZE          512
+#define W1_PAGE_SIZE            32
+#define W1_PAGE_BITS            5
+#define W1_PAGE_MASK            0x1F
+
+#define W1_F23_READ_EEPROM      0xF0
+#define W1_F23_WRITE_SCRATCH    0x0F
+#define W1_F23_READ_SCRATCH     0xAA
+#define W1_F23_COPY_SCRATCH     0x55
+
+/**
+ * Check the file size bounds and adjusts count as needed.
+ * This may not be needed if the sysfs layer checks bounds.
+ */
+static inline size_t w1_f23_fix_count(loff_t off, size_t count, size_t size)
+{
+        if (off > size)
+                return 0;
+
+        if ((off + count) > size)
+                return (size - off);
+
+        return count;
+}
+
+static ssize_t w1_f23_read_bin(struct kobject *kobj, char *buf, loff_t off, size_t count)
+{
+        struct w1_slave *sl = kobj_to_w1_slave(kobj);
+        u8 wrbuf[3];
+
+        if ((count = w1_f23_fix_count(off, count, W1_EEPROM_SIZE)) == 0)
+                return 0;
+
+        atomic_inc(&sl->refcnt);
+        if (down_interruptible(&sl->master->mutex)) {
+                count = 0;
+                goto out_dec;
+        }
+
+        /* read directly from the EEPROM */
+        if (w1_reset_select_slave(sl)) {
+                count = -EIO;
+                goto out_up;
+        }
+
+        wrbuf[0] = W1_F23_READ_EEPROM;
+        wrbuf[1] = off & 0xff;
+        wrbuf[2] = off >> 8;
+        w1_write_block(sl->master, wrbuf, 3);
+        w1_read_block(sl->master, buf, count);
+
+out_up:
+        up(&sl->master->mutex);
+out_dec:
+        atomic_dec(&sl->refcnt);
+
+        return count;
+}
+
+/**
+ * Writes to the scratchpad and reads it back for verification.
+ * The master must be locked.
+ *
+ * @param sl    The slave structure
+ * @param addr  Address for the write
+ * @param len   length must be <= (W1_PAGE_SIZE - (addr & W1_PAGE_MASK))
+ * @param data  The data to write
+ * @return      0=Success -1=failure
+ */
+static int w1_f23_write(struct w1_slave *sl, int addr, int len, const u8 *data)
+{
+        u8 wrbuf[4];
+        u8 rdbuf[W1_PAGE_SIZE + 3];
+        u8 es = (addr + len - 1) & 0x1f;
+
+        /* Write the data to the scratchpad */
+        if (w1_reset_select_slave(sl))
+                return -1;
+
+        wrbuf[0] = W1_F23_WRITE_SCRATCH;
+        wrbuf[1] = addr & 0xff;
+        wrbuf[2] = addr >> 8;
+
+        w1_write_block(sl->master, wrbuf, 3);
+        w1_write_block(sl->master, data, len);
+
+        /* Read the scratchpad and verify */
+        if (w1_reset_select_slave(sl))
+                return -1;
+
+        w1_write_8(sl->master, W1_F23_READ_SCRATCH);
+        w1_read_block(sl->master, rdbuf, len + 3);
+
+        /* Compare what was read against the data written */
+        if ((rdbuf[0] != wrbuf[1]) || (rdbuf[1] != wrbuf[2]) ||
+            (rdbuf[2] != es) || (memcmp(data, &rdbuf[3], len) != 0))
+                return -1;
+
+        /* Copy the scratchpad to EEPROM */
+        if (w1_reset_select_slave(sl))
+                return -1;
+
+        wrbuf[0] = W1_F23_COPY_SCRATCH;
+        wrbuf[3] = es;
+        w1_write_block(sl->master, wrbuf, 4);
+
+        /* Sleep for 5 ms to wait for the write to complete */
+        msleep(5);
+
+        /* Reset the bus to wake up the EEPROM (this may not be needed) */
+        w1_reset_bus(sl->master);
+
+        return 0;
+}
+
+static ssize_t w1_f23_write_bin(struct kobject *kobj, char *buf, loff_t off,
+                                size_t count)
+{
+        struct w1_slave *sl = kobj_to_w1_slave(kobj);
+        int addr, len, idx;
+
+        if ((count = w1_f23_fix_count(off, count, W1_EEPROM_SIZE)) == 0)
+                return 0;
+
+        atomic_inc(&sl->refcnt);
+        if (down_interruptible(&sl->master->mutex)) {
+                count = 0;
+                goto out_dec;
+        }
+
+        /* Can only write data to one page at a time */
+        idx = 0;
+        while (idx < count) {
+                addr = off + idx;
+                len = W1_PAGE_SIZE - (addr & W1_PAGE_MASK);
+                if (len > (count - idx))
+                        len = count - idx;
+
+                if (w1_f23_write(sl, addr, len, &buf[idx]) < 0) {
+                        count = -EIO;
+                        goto out_up;
+                }
+                idx += len;
+        }
+
+out_up:
+        up(&sl->master->mutex);
+out_dec:
+        atomic_dec(&sl->refcnt);
+
+        return count;
+}
+
+static struct bin_attribute w1_f23_bin_attr = {
+        .attr = {
+                .name = "eeprom",
+                .mode = S_IRUGO | S_IWUSR,
+                .owner = THIS_MODULE,
+        },
+        .size = W1_EEPROM_SIZE,
+        .read = w1_f23_read_bin,
+        .write = w1_f23_write_bin,
+};
+
+static int w1_f23_add_slave(struct w1_slave *sl)
+{
+        return sysfs_create_bin_file(&sl->dev.kobj, &w1_f23_bin_attr);
+}
+
+static void w1_f23_remove_slave(struct w1_slave *sl)
+{
+        sysfs_remove_bin_file(&sl->dev.kobj, &w1_f23_bin_attr);
+}
+
+static struct w1_family_ops w1_f23_fops = {
+        .add_slave      = w1_f23_add_slave,
+        .remove_slave   = w1_f23_remove_slave,
+};
+
+static struct w1_family w1_family_23 = {
+        .fid = W1_EEPROM_DS2433,
+        .fops = &w1_f23_fops,
+};
+
+static int __init w1_f23_init(void)
+{
+        return w1_register_family(&w1_family_23);
+}
+
+static void __exit w1_f23_fini(void)
+{
+        w1_unregister_family(&w1_family_23);
+}
+
+module_init(w1_f23_init);
+module_exit(w1_f23_fini);