1 files changed, 352 insertions, 0 deletions

diff --git a/drivers/i2c/chips/smsc47b397.c b/drivers/i2c/chips/smsc47b397.c
new file mode 100644
index 000000000000..1119c76791d9
--- /dev/null
+++ b/drivers/i2c/chips/smsc47b397.c
@@ -0,0 +1,352 @@
+/*
+    smsc47b397.c - Part of lm_sensors, Linux kernel modules
+                        for hardware monitoring
+
+    Supports the SMSC LPC47B397-NC Super-I/O chip.
+
+    Author/Maintainer: Mark M. Hoffman <mhoffman@lightlink.com>
+        Copyright (C) 2004 Utilitek Systems, Inc.
+
+    derived in part from smsc47m1.c:
+        Copyright (C) 2002 Mark D. Studebaker <mdsxyz123@yahoo.com>
+        Copyright (C) 2004 Jean Delvare <khali@linux-fr.org>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/ioport.h>
+#include <linux/jiffies.h>
+#include <linux/i2c.h>
+#include <linux/i2c-sensor.h>
+#include <linux/init.h>
+#include <asm/io.h>
+
+static unsigned short normal_i2c[] = { I2C_CLIENT_END };
+/* Address is autodetected, there is no default value */
+static unsigned int normal_isa[] = { 0x0000, I2C_CLIENT_ISA_END };
+static struct i2c_force_data forces[] = {{NULL}};
+
+enum chips { any_chip, smsc47b397 };
+static struct i2c_address_data addr_data = {
+        .normal_i2c             = normal_i2c,
+        .normal_isa             = normal_isa,
+        .probe                  = normal_i2c,           /* cheat */
+        .ignore                 = normal_i2c,           /* cheat */
+        .forces                 = forces,
+};
+
+/* Super-I/0 registers and commands */
+
+#define REG     0x2e    /* The register to read/write */
+#define VAL     0x2f    /* The value to read/write */
+
+static inline void superio_outb(int reg, int val)
+{
+        outb(reg, REG);
+        outb(val, VAL);
+}
+
+static inline int superio_inb(int reg)
+{
+        outb(reg, REG);
+        return inb(VAL);
+}
+
+/* select superio logical device */
+static inline void superio_select(int ld)
+{
+        superio_outb(0x07, ld);
+}
+
+static inline void superio_enter(void)
+{
+        outb(0x55, REG);
+}
+
+static inline void superio_exit(void)
+{
+        outb(0xAA, REG);
+}
+
+#define SUPERIO_REG_DEVID       0x20
+#define SUPERIO_REG_DEVREV      0x21
+#define SUPERIO_REG_BASE_MSB    0x60
+#define SUPERIO_REG_BASE_LSB    0x61
+#define SUPERIO_REG_LD8         0x08
+
+#define SMSC_EXTENT             0x02
+
+/* 0 <= nr <= 3 */
+static u8 smsc47b397_reg_temp[] = {0x25, 0x26, 0x27, 0x80};
+#define SMSC47B397_REG_TEMP(nr) (smsc47b397_reg_temp[(nr)])
+
+/* 0 <= nr <= 3 */
+#define SMSC47B397_REG_FAN_LSB(nr) (0x28 + 2 * (nr))
+#define SMSC47B397_REG_FAN_MSB(nr) (0x29 + 2 * (nr))
+
+struct smsc47b397_data {
+        struct i2c_client client;
+        struct semaphore lock;
+
+        struct semaphore update_lock;
+        unsigned long last_updated; /* in jiffies */
+        int valid;
+
+        /* register values */
+        u16 fan[4];
+        u8 temp[4];
+};
+
+static int smsc47b397_read_value(struct i2c_client *client, u8 reg)
+{
+        struct smsc47b397_data *data = i2c_get_clientdata(client);
+        int res;
+
+        down(&data->lock);
+        outb(reg, client->addr);
+        res = inb_p(client->addr + 1);
+        up(&data->lock);
+        return res;
+}
+
+static struct smsc47b397_data *smsc47b397_update_device(struct device *dev)
+{
+        struct i2c_client *client = to_i2c_client(dev);
+        struct smsc47b397_data *data = i2c_get_clientdata(client);
+        int i;
+
+        down(&data->update_lock);
+
+        if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
+                dev_dbg(&client->dev, "starting device update...\n");
+
+                /* 4 temperature inputs, 4 fan inputs */
+                for (i = 0; i < 4; i++) {
+                        data->temp[i] = smsc47b397_read_value(client,
+                                        SMSC47B397_REG_TEMP(i));
+
+                        /* must read LSB first */
+                        data->fan[i]  = smsc47b397_read_value(client,
+                                        SMSC47B397_REG_FAN_LSB(i));
+                        data->fan[i] |= smsc47b397_read_value(client,
+                                        SMSC47B397_REG_FAN_MSB(i)) << 8;
+                }
+
+                data->last_updated = jiffies;
+                data->valid = 1;
+
+                dev_dbg(&client->dev, "... device update complete\n");
+        }
+
+        up(&data->update_lock);
+
+        return data;
+}
+
+/* TEMP: 0.001C/bit (-128C to +127C)
+   REG: 1C/bit, two's complement */
+static int temp_from_reg(u8 reg)
+{
+        return (s8)reg * 1000;
+}
+
+/* 0 <= nr <= 3 */
+static ssize_t show_temp(struct device *dev, char *buf, int nr)
+{
+        struct smsc47b397_data *data = smsc47b397_update_device(dev);
+        return sprintf(buf, "%d\n", temp_from_reg(data->temp[nr]));
+}
+
+#define sysfs_temp(num) \
+static ssize_t show_temp##num(struct device *dev, char *buf) \
+{ \
+        return show_temp(dev, buf, num-1); \
+} \
+static DEVICE_ATTR(temp##num##_input, S_IRUGO, show_temp##num, NULL)
+
+sysfs_temp(1);
+sysfs_temp(2);
+sysfs_temp(3);
+sysfs_temp(4);
+
+#define device_create_file_temp(client, num) \
+        device_create_file(&client->dev, &dev_attr_temp##num##_input)
+
+/* FAN: 1 RPM/bit
+   REG: count of 90kHz pulses / revolution */
+static int fan_from_reg(u16 reg)
+{
+        return 90000 * 60 / reg;
+}
+
+/* 0 <= nr <= 3 */
+static ssize_t show_fan(struct device *dev, char *buf, int nr)
+{
+        struct smsc47b397_data *data = smsc47b397_update_device(dev);
+        return sprintf(buf, "%d\n", fan_from_reg(data->fan[nr]));
+}
+
+#define sysfs_fan(num) \
+static ssize_t show_fan##num(struct device *dev, char *buf) \
+{ \
+        return show_fan(dev, buf, num-1); \
+} \
+static DEVICE_ATTR(fan##num##_input, S_IRUGO, show_fan##num, NULL)
+
+sysfs_fan(1);
+sysfs_fan(2);
+sysfs_fan(3);
+sysfs_fan(4);
+
+#define device_create_file_fan(client, num) \
+        device_create_file(&client->dev, &dev_attr_fan##num##_input)
+
+static int smsc47b397_detect(struct i2c_adapter *adapter, int addr, int kind);
+
+static int smsc47b397_attach_adapter(struct i2c_adapter *adapter)
+{
+        if (!(adapter->class & I2C_CLASS_HWMON))
+                return 0;
+        return i2c_detect(adapter, &addr_data, smsc47b397_detect);
+}
+
+static int smsc47b397_detach_client(struct i2c_client *client)
+{
+        int err;
+
+        if ((err = i2c_detach_client(client))) {
+                dev_err(&client->dev, "Client deregistration failed, "
+                        "client not detached.\n");
+                return err;
+        }
+
+        release_region(client->addr, SMSC_EXTENT);
+        kfree(i2c_get_clientdata(client));
+
+        return 0;
+}
+
+static struct i2c_driver smsc47b397_driver = {
+        .owner          = THIS_MODULE,
+        .name           = "smsc47b397",
+        .id             = I2C_DRIVERID_SMSC47B397,
+        .flags          = I2C_DF_NOTIFY,
+        .attach_adapter = smsc47b397_attach_adapter,
+        .detach_client  = smsc47b397_detach_client,
+};
+
+static int smsc47b397_detect(struct i2c_adapter *adapter, int addr, int kind)
+{
+        struct i2c_client *new_client;
+        struct smsc47b397_data *data;
+        int err = 0;
+
+        if (!i2c_is_isa_adapter(adapter)) {
+                return 0;
+        }
+
+        if (!request_region(addr, SMSC_EXTENT, smsc47b397_driver.name)) {
+                dev_err(&adapter->dev, "Region 0x%x already in use!\n", addr);
+                return -EBUSY;
+        }
+
+        if (!(data = kmalloc(sizeof(struct smsc47b397_data), GFP_KERNEL))) {
+                err = -ENOMEM;
+                goto error_release;
+        }
+        memset(data, 0x00, sizeof(struct smsc47b397_data));
+
+        new_client = &data->client;
+        i2c_set_clientdata(new_client, data);
+        new_client->addr = addr;
+        init_MUTEX(&data->lock);
+        new_client->adapter = adapter;
+        new_client->driver = &smsc47b397_driver;
+        new_client->flags = 0;
+
+        strlcpy(new_client->name, "smsc47b397", I2C_NAME_SIZE);
+
+        init_MUTEX(&data->update_lock);
+
+        if ((err = i2c_attach_client(new_client)))
+                goto error_free;
+
+        device_create_file_temp(new_client, 1);
+        device_create_file_temp(new_client, 2);
+        device_create_file_temp(new_client, 3);
+        device_create_file_temp(new_client, 4);
+
+        device_create_file_fan(new_client, 1);
+        device_create_file_fan(new_client, 2);
+        device_create_file_fan(new_client, 3);
+        device_create_file_fan(new_client, 4);
+
+        return 0;
+
+error_free:
+        kfree(new_client);
+error_release:
+        release_region(addr, SMSC_EXTENT);
+        return err;
+}
+
+static int __init smsc47b397_find(unsigned int *addr)
+{
+        u8 id, rev;
+
+        superio_enter();
+        id = superio_inb(SUPERIO_REG_DEVID);
+
+        if (id != 0x6f) {
+                superio_exit();
+                return -ENODEV;
+        }
+
+        rev = superio_inb(SUPERIO_REG_DEVREV);
+
+        superio_select(SUPERIO_REG_LD8);
+        *addr = (superio_inb(SUPERIO_REG_BASE_MSB) << 8)
+                 |  superio_inb(SUPERIO_REG_BASE_LSB);
+
+        printk(KERN_INFO "smsc47b397: found SMSC LPC47B397-NC "
+                "(base address 0x%04x, revision %u)\n", *addr, rev);
+
+        superio_exit();
+        return 0;
+}
+
+static int __init smsc47b397_init(void)
+{
+        int ret;
+
+        if ((ret = smsc47b397_find(normal_isa)))
+                return ret;
+
+        return i2c_add_driver(&smsc47b397_driver);
+}
+
+static void __exit smsc47b397_exit(void)
+{
+        i2c_del_driver(&smsc47b397_driver);
+}
+
+MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");
+MODULE_DESCRIPTION("SMSC LPC47B397 driver");
+MODULE_LICENSE("GPL");
+
+module_init(smsc47b397_init);
+module_exit(smsc47b397_exit);