I2C: Move hwmon drivers (2/3)

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+/*
+    adm1021.c - Part of lm_sensors, Linux kernel modules for hardware
+             monitoring
+    Copyright (c) 1998, 1999  Frodo Looijaard <[email protected]> and
+    Philip Edelbrock <[email protected]>
+
+    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/init.h>
+#include <linux/slab.h>
+#include <linux/jiffies.h>
+#include <linux/i2c.h>
+#include <linux/i2c-sensor.h>
+
+
+/* Addresses to scan */
+static unsigned short normal_i2c[] = { 0x18, 0x19, 0x1a,
+					0x29, 0x2a, 0x2b,
+					0x4c, 0x4d, 0x4e, 
+					I2C_CLIENT_END };
+static unsigned int normal_isa[] = { I2C_CLIENT_ISA_END };
+
+/* Insmod parameters */
+SENSORS_INSMOD_8(adm1021, adm1023, max1617, max1617a, thmc10, lm84, gl523sm, mc1066);
+
+/* adm1021 constants specified below */
+
+/* The adm1021 registers */
+/* Read-only */
+#define ADM1021_REG_TEMP		0x00
+#define ADM1021_REG_REMOTE_TEMP		0x01
+#define ADM1021_REG_STATUS		0x02
+#define ADM1021_REG_MAN_ID		0x0FE	/* 0x41 = AMD, 0x49 = TI, 0x4D = Maxim, 0x23 = Genesys , 0x54 = Onsemi*/
+#define ADM1021_REG_DEV_ID		0x0FF	/* ADM1021 = 0x0X, ADM1023 = 0x3X */
+#define ADM1021_REG_DIE_CODE		0x0FF	/* MAX1617A */
+/* These use different addresses for reading/writing */
+#define ADM1021_REG_CONFIG_R		0x03
+#define ADM1021_REG_CONFIG_W		0x09
+#define ADM1021_REG_CONV_RATE_R		0x04
+#define ADM1021_REG_CONV_RATE_W		0x0A
+/* These are for the ADM1023's additional precision on the remote temp sensor */
+#define ADM1021_REG_REM_TEMP_PREC	0x010
+#define ADM1021_REG_REM_OFFSET		0x011
+#define ADM1021_REG_REM_OFFSET_PREC	0x012
+#define ADM1021_REG_REM_TOS_PREC	0x013
+#define ADM1021_REG_REM_THYST_PREC	0x014
+/* limits */
+#define ADM1021_REG_TOS_R		0x05
+#define ADM1021_REG_TOS_W		0x0B
+#define ADM1021_REG_REMOTE_TOS_R	0x07
+#define ADM1021_REG_REMOTE_TOS_W	0x0D
+#define ADM1021_REG_THYST_R		0x06
+#define ADM1021_REG_THYST_W		0x0C
+#define ADM1021_REG_REMOTE_THYST_R	0x08
+#define ADM1021_REG_REMOTE_THYST_W	0x0E
+/* write-only */
+#define ADM1021_REG_ONESHOT		0x0F
+
+
+/* Conversions. Rounding and limit checking is only done on the TO_REG
+   variants. Note that you should be a bit careful with which arguments
+   these macros are called: arguments may be evaluated more than once.
+   Fixing this is just not worth it. */
+/* Conversions  note: 1021 uses normal integer signed-byte format*/
+#define TEMP_FROM_REG(val)	(val > 127 ? (val-256)*1000 : val*1000)
+#define TEMP_TO_REG(val)	(SENSORS_LIMIT((val < 0 ? (val/1000)+256 : val/1000),0,255))
+
+/* Initial values */
+
+/* Note: Even though I left the low and high limits named os and hyst, 
+they don't quite work like a thermostat the way the LM75 does.  I.e., 
+a lower temp than THYST actually triggers an alarm instead of 
+clearing it.  Weird, ey?   --Phil  */
+
+/* Each client has this additional data */
+struct adm1021_data {
+	struct i2c_client client;
+	enum chips type;
+
+	struct semaphore update_lock;
+	char valid;		/* !=0 if following fields are valid */
+	unsigned long last_updated;	/* In jiffies */
+
+	u8	temp_max;	/* Register values */
+	u8	temp_hyst;
+	u8	temp_input;
+	u8	remote_temp_max;
+	u8	remote_temp_hyst;
+	u8	remote_temp_input;
+	u8	alarms;
+        /* Special values for ADM1023 only */
+	u8	remote_temp_prec;
+	u8	remote_temp_os_prec;
+	u8	remote_temp_hyst_prec;
+	u8	remote_temp_offset;
+	u8	remote_temp_offset_prec;
+};
+
+static int adm1021_attach_adapter(struct i2c_adapter *adapter);
+static int adm1021_detect(struct i2c_adapter *adapter, int address, int kind);
+static void adm1021_init_client(struct i2c_client *client);
+static int adm1021_detach_client(struct i2c_client *client);
+static int adm1021_read_value(struct i2c_client *client, u8 reg);
+static int adm1021_write_value(struct i2c_client *client, u8 reg,
+			       u16 value);
+static struct adm1021_data *adm1021_update_device(struct device *dev);
+
+/* (amalysh) read only mode, otherwise any limit's writing confuse BIOS */
+static int read_only = 0;
+
+
+/* This is the driver that will be inserted */
+static struct i2c_driver adm1021_driver = {
+	.owner		= THIS_MODULE,
+	.name		= "adm1021",
+	.id		= I2C_DRIVERID_ADM1021,
+	.flags		= I2C_DF_NOTIFY,
+	.attach_adapter	= adm1021_attach_adapter,
+	.detach_client	= adm1021_detach_client,
+};
+
+#define show(value)	\
+static ssize_t show_##value(struct device *dev, struct device_attribute *attr, char *buf)		\
+{									\
+	struct adm1021_data *data = adm1021_update_device(dev);		\
+	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->value));	\
+}
+show(temp_max);
+show(temp_hyst);
+show(temp_input);
+show(remote_temp_max);
+show(remote_temp_hyst);
+show(remote_temp_input);
+
+#define show2(value)	\
+static ssize_t show_##value(struct device *dev, struct device_attribute *attr, char *buf)		\
+{									\
+	struct adm1021_data *data = adm1021_update_device(dev);		\
+	return sprintf(buf, "%d\n", data->value);			\
+}
+show2(alarms);
+
+#define set(value, reg)	\
+static ssize_t set_##value(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)	\
+{								\
+	struct i2c_client *client = to_i2c_client(dev);		\
+	struct adm1021_data *data = i2c_get_clientdata(client);	\
+	int temp = simple_strtoul(buf, NULL, 10);		\
+								\
+	down(&data->update_lock);				\
+	data->value = TEMP_TO_REG(temp);			\
+	adm1021_write_value(client, reg, data->value);		\
+	up(&data->update_lock);					\
+	return count;						\
+}
+set(temp_max, ADM1021_REG_TOS_W);
+set(temp_hyst, ADM1021_REG_THYST_W);
+set(remote_temp_max, ADM1021_REG_REMOTE_TOS_W);
+set(remote_temp_hyst, ADM1021_REG_REMOTE_THYST_W);
+
+static DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_max, set_temp_max);
+static DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp_hyst, set_temp_hyst);
+static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input, NULL);
+static DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_remote_temp_max, set_remote_temp_max);
+static DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_remote_temp_hyst, set_remote_temp_hyst);
+static DEVICE_ATTR(temp2_input, S_IRUGO, show_remote_temp_input, NULL);
+static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
+
+
+static int adm1021_attach_adapter(struct i2c_adapter *adapter)
+{
+	if (!(adapter->class & I2C_CLASS_HWMON))
+		return 0;
+	return i2c_detect(adapter, &addr_data, adm1021_detect);
+}
+
+static int adm1021_detect(struct i2c_adapter *adapter, int address, int kind)
+{
+	int i;
+	struct i2c_client *new_client;
+	struct adm1021_data *data;
+	int err = 0;
+	const char *type_name = "";
+
+	/* Make sure we aren't probing the ISA bus!! This is just a safety check
+	   at this moment; i2c_detect really won't call us. */
+#ifdef DEBUG
+	if (i2c_is_isa_adapter(adapter)) {
+		dev_dbg(&adapter->dev, "adm1021_detect called for an ISA bus adapter?!?\n");
+		return 0;
+	}
+#endif
+
+	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+		goto error0;
+
+	/* OK. For now, we presume we have a valid client. We now create the
+	   client structure, even though we cannot fill it completely yet.
+	   But it allows us to access adm1021_{read,write}_value. */
+
+	if (!(data = kmalloc(sizeof(struct adm1021_data), GFP_KERNEL))) {
+		err = -ENOMEM;
+		goto error0;
+	}
+	memset(data, 0, sizeof(struct adm1021_data));
+
+	new_client = &data->client;
+	i2c_set_clientdata(new_client, data);
+	new_client->addr = address;
+	new_client->adapter = adapter;
+	new_client->driver = &adm1021_driver;
+	new_client->flags = 0;
+
+	/* Now, we do the remaining detection. */
+	if (kind < 0) {
+		if ((adm1021_read_value(new_client, ADM1021_REG_STATUS) & 0x03) != 0x00
+		 || (adm1021_read_value(new_client, ADM1021_REG_CONFIG_R) & 0x3F) != 0x00
+		 || (adm1021_read_value(new_client, ADM1021_REG_CONV_RATE_R) & 0xF8) != 0x00) {
+			err = -ENODEV;
+			goto error1;
+		}
+	}
+
+	/* Determine the chip type. */
+	if (kind <= 0) {
+		i = adm1021_read_value(new_client, ADM1021_REG_MAN_ID);
+		if (i = 0x41)
+			if ((adm1021_read_value(new_client, ADM1021_REG_DEV_ID) & 0x0F0) = 0x030)
+				kind = adm1023;
+			else
+				kind = adm1021;
+		else if (i = 0x49)
+			kind = thmc10;
+		else if (i = 0x23)
+			kind = gl523sm;
+		else if ((i = 0x4d) &&
+			 (adm1021_read_value(new_client, ADM1021_REG_DEV_ID) = 0x01))
+			kind = max1617a;
+		else if (i = 0x54)
+			kind = mc1066;
+		/* LM84 Mfr ID in a different place, and it has more unused bits */
+		else if (adm1021_read_value(new_client, ADM1021_REG_CONV_RATE_R) = 0x00
+		      && (kind = 0 /* skip extra detection */
+		       || ((adm1021_read_value(new_client, ADM1021_REG_CONFIG_R) & 0x7F) = 0x00
+			&& (adm1021_read_value(new_client, ADM1021_REG_STATUS) & 0xAB) = 0x00)))
+			kind = lm84;
+		else
+			kind = max1617;
+	}
+
+	if (kind = max1617) {
+		type_name = "max1617";
+	} else if (kind = max1617a) {
+		type_name = "max1617a";
+	} else if (kind = adm1021) {
+		type_name = "adm1021";
+	} else if (kind = adm1023) {
+		type_name = "adm1023";
+	} else if (kind = thmc10) {
+		type_name = "thmc10";
+	} else if (kind = lm84) {
+		type_name = "lm84";
+	} else if (kind = gl523sm) {
+		type_name = "gl523sm";
+	} else if (kind = mc1066) {
+		type_name = "mc1066";
+	}
+
+	/* Fill in the remaining client fields and put it into the global list */
+	strlcpy(new_client->name, type_name, I2C_NAME_SIZE);
+	data->type = kind;
+	data->valid = 0;
+	init_MUTEX(&data->update_lock);
+
+	/* Tell the I2C layer a new client has arrived */
+	if ((err = i2c_attach_client(new_client)))
+		goto error1;
+
+	/* Initialize the ADM1021 chip */
+	if (kind != lm84)
+		adm1021_init_client(new_client);
+
+	/* Register sysfs hooks */
+	device_create_file(&new_client->dev, &dev_attr_temp1_max);
+	device_create_file(&new_client->dev, &dev_attr_temp1_min);
+	device_create_file(&new_client->dev, &dev_attr_temp1_input);
+	device_create_file(&new_client->dev, &dev_attr_temp2_max);
+	device_create_file(&new_client->dev, &dev_attr_temp2_min);
+	device_create_file(&new_client->dev, &dev_attr_temp2_input);
+	device_create_file(&new_client->dev, &dev_attr_alarms);
+
+	return 0;
+
+error1:
+	kfree(data);
+error0:
+	return err;
+}
+
+static void adm1021_init_client(struct i2c_client *client)
+{
+	/* Enable ADC and disable suspend mode */
+	adm1021_write_value(client, ADM1021_REG_CONFIG_W,
+		adm1021_read_value(client, ADM1021_REG_CONFIG_R) & 0xBF);
+	/* Set Conversion rate to 1/sec (this can be tinkered with) */
+	adm1021_write_value(client, ADM1021_REG_CONV_RATE_W, 0x04);
+}
+
+static int adm1021_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;
+	}
+
+	kfree(i2c_get_clientdata(client));
+	return 0;
+}
+
+/* All registers are byte-sized */
+static int adm1021_read_value(struct i2c_client *client, u8 reg)
+{
+	return i2c_smbus_read_byte_data(client, reg);
+}
+
+static int adm1021_write_value(struct i2c_client *client, u8 reg, u16 value)
+{
+	if (!read_only)
+		return i2c_smbus_write_byte_data(client, reg, value);
+	return 0;
+}
+
+static struct adm1021_data *adm1021_update_device(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct adm1021_data *data = i2c_get_clientdata(client);
+
+	down(&data->update_lock);
+
+	if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
+	    || !data->valid) {
+		dev_dbg(&client->dev, "Starting adm1021 update\n");
+
+		data->temp_input = adm1021_read_value(client, ADM1021_REG_TEMP);
+		data->temp_max = adm1021_read_value(client, ADM1021_REG_TOS_R);
+		data->temp_hyst = adm1021_read_value(client, ADM1021_REG_THYST_R);
+		data->remote_temp_input = adm1021_read_value(client, ADM1021_REG_REMOTE_TEMP);
+		data->remote_temp_max = adm1021_read_value(client, ADM1021_REG_REMOTE_TOS_R);
+		data->remote_temp_hyst = adm1021_read_value(client, ADM1021_REG_REMOTE_THYST_R);
+		data->alarms = adm1021_read_value(client, ADM1021_REG_STATUS) & 0x7c;
+		if (data->type = adm1023) {
+			data->remote_temp_prec = adm1021_read_value(client, ADM1021_REG_REM_TEMP_PREC);
+			data->remote_temp_os_prec = adm1021_read_value(client, ADM1021_REG_REM_TOS_PREC);
+			data->remote_temp_hyst_prec = adm1021_read_value(client, ADM1021_REG_REM_THYST_PREC);
+			data->remote_temp_offset = adm1021_read_value(client, ADM1021_REG_REM_OFFSET);
+			data->remote_temp_offset_prec = adm1021_read_value(client, ADM1021_REG_REM_OFFSET_PREC);
+		}
+		data->last_updated = jiffies;
+		data->valid = 1;
+	}
+
+	up(&data->update_lock);
+
+	return data;
+}
+
+static int __init sensors_adm1021_init(void)
+{
+	return i2c_add_driver(&adm1021_driver);
+}
+
+static void __exit sensors_adm1021_exit(void)
+{
+	i2c_del_driver(&adm1021_driver);
+}
+
+MODULE_AUTHOR ("Frodo Looijaard <[email protected]> and "
+		"Philip Edelbrock <[email protected]>");
+MODULE_DESCRIPTION("adm1021 driver");
+MODULE_LICENSE("GPL");
+
+module_param(read_only, bool, 0);
+MODULE_PARM_DESC(read_only, "Don't set any values, read only mode");
+
+module_init(sensors_adm1021_init)
+module_exit(sensors_adm1021_exit)

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