[linux.git] / drivers / misc / ics932s401.c

/*
 * A driver for the Integrated Circuits ICS932S401
 * Copyright (C) 2008 IBM
 *
 * Author: Darrick J. Wong <[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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <linux/module.h>
#include <linux/jiffies.h>
#include <linux/i2c.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/delay.h>
#include <linux/log2.h>

/* Addresses to scan */
static const unsigned short normal_i2c[] = { 0x69, I2C_CLIENT_END };

/* Insmod parameters */
I2C_CLIENT_INSMOD_1(ics932s401);

/* ICS932S401 registers */
#define ICS932S401_REG_CFG2			0x01
#define 	ICS932S401_CFG1_SPREAD		0x01
#define ICS932S401_REG_CFG7			0x06
#define		ICS932S401_FS_MASK		0x07
#define	ICS932S401_REG_VENDOR_REV		0x07
#define		ICS932S401_VENDOR		1
#define		ICS932S401_VENDOR_MASK		0x0F
#define		ICS932S401_REV			4
#define		ICS932S401_REV_SHIFT		4
#define ICS932S401_REG_DEVICE			0x09
#define		ICS932S401_DEVICE		11
#define	ICS932S401_REG_CTRL			0x0A
#define		ICS932S401_MN_ENABLED		0x80
#define		ICS932S401_CPU_ALT		0x04
#define		ICS932S401_SRC_ALT		0x08
#define ICS932S401_REG_CPU_M_CTRL		0x0B
#define		ICS932S401_M_MASK		0x3F
#define	ICS932S401_REG_CPU_N_CTRL		0x0C
#define	ICS932S401_REG_CPU_SPREAD1		0x0D
#define ICS932S401_REG_CPU_SPREAD2		0x0E
#define		ICS932S401_SPREAD_MASK		0x7FFF
#define ICS932S401_REG_SRC_M_CTRL		0x0F
#define ICS932S401_REG_SRC_N_CTRL		0x10
#define	ICS932S401_REG_SRC_SPREAD1		0x11
#define ICS932S401_REG_SRC_SPREAD2		0x12
#define ICS932S401_REG_CPU_DIVISOR		0x13
#define 	ICS932S401_CPU_DIVISOR_SHIFT	4
#define ICS932S401_REG_PCISRC_DIVISOR		0x14
#define		ICS932S401_SRC_DIVISOR_MASK	0x0F
#define		ICS932S401_PCI_DIVISOR_SHIFT	4

/* Base clock is 14.318MHz */
#define BASE_CLOCK				14318

#define NUM_REGS				21
#define NUM_MIRRORED_REGS			15

static int regs_to_copy[NUM_MIRRORED_REGS] = {
	ICS932S401_REG_CFG2,
	ICS932S401_REG_CFG7,
	ICS932S401_REG_VENDOR_REV,
	ICS932S401_REG_DEVICE,
	ICS932S401_REG_CTRL,
	ICS932S401_REG_CPU_M_CTRL,
	ICS932S401_REG_CPU_N_CTRL,
	ICS932S401_REG_CPU_SPREAD1,
	ICS932S401_REG_CPU_SPREAD2,
	ICS932S401_REG_SRC_M_CTRL,
	ICS932S401_REG_SRC_N_CTRL,
	ICS932S401_REG_SRC_SPREAD1,
	ICS932S401_REG_SRC_SPREAD2,
	ICS932S401_REG_CPU_DIVISOR,
	ICS932S401_REG_PCISRC_DIVISOR,
};

/* How often do we reread sensors values? (In jiffies) */
#define SENSOR_REFRESH_INTERVAL	(2 * HZ)

/* How often do we reread sensor limit values? (In jiffies) */
#define LIMIT_REFRESH_INTERVAL	(60 * HZ)

struct ics932s401_data {
	struct attribute_group	attrs;
	struct mutex		lock;
	char			sensors_valid;
	unsigned long		sensors_last_updated;	/* In jiffies */

	u8			regs[NUM_REGS];
};

static int ics932s401_probe(struct i2c_client *client,
			 const struct i2c_device_id *id);
static int ics932s401_detect(struct i2c_client *client, int kind,
			  struct i2c_board_info *info);
static int ics932s401_remove(struct i2c_client *client);

static const struct i2c_device_id ics932s401_id[] = {
	{ "ics932s401", ics932s401 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, ics932s401_id);

static struct i2c_driver ics932s401_driver = {
	.class		= I2C_CLASS_HWMON,
	.driver = {
		.name	= "ics932s401",
	},
	.probe		= ics932s401_probe,
	.remove		= ics932s401_remove,
	.id_table	= ics932s401_id,
	.detect		= ics932s401_detect,
	.address_data	= &addr_data,
};

static struct ics932s401_data *ics932s401_update_device(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct ics932s401_data *data = i2c_get_clientdata(client);
	unsigned long local_jiffies = jiffies;
	int i, temp;

	mutex_lock(&data->lock);
	if (time_before(local_jiffies, data->sensors_last_updated +
		SENSOR_REFRESH_INTERVAL)
		&& data->sensors_valid)
		goto out;

	/*
	 * Each register must be read as a word and then right shifted 8 bits.
	 * Not really sure why this is; setting the "byte count programming"
	 * register to 1 does not fix this problem.
	 */
	for (i = 0; i < NUM_MIRRORED_REGS; i++) {
		temp = i2c_smbus_read_word_data(client, regs_to_copy[i]);
		data->regs[regs_to_copy[i]] = temp >> 8;
	}

	data->sensors_last_updated = local_jiffies;
	data->sensors_valid = 1;

out:
	mutex_unlock(&data->lock);
	return data;
}

static ssize_t show_spread_enabled(struct device *dev,
				   struct device_attribute *devattr,
				   char *buf)
{
	struct ics932s401_data *data = ics932s401_update_device(dev);

	if (data->regs[ICS932S401_REG_CFG2] & ICS932S401_CFG1_SPREAD)
		return sprintf(buf, "1\n");

	return sprintf(buf, "0\n");
}

/* bit to cpu khz map */
static const int fs_speeds[] = {
	266666,
	133333,
	200000,
	166666,
	333333,
	100000,
	400000,
	0,
};

/* clock divisor map */
static const int divisors[] = {2, 3, 5, 15, 4, 6, 10, 30, 8, 12, 20, 60, 16,
			       24, 40, 120};

/* Calculate CPU frequency from the M/N registers. */
static int calculate_cpu_freq(struct ics932s401_data *data)
{
	int m, n, freq;

	m = data->regs[ICS932S401_REG_CPU_M_CTRL] & ICS932S401_M_MASK;
	n = data->regs[ICS932S401_REG_CPU_N_CTRL];

	/* Pull in bits 8 & 9 from the M register */
	n |= ((int)data->regs[ICS932S401_REG_CPU_M_CTRL] & 0x80) << 1;
	n |= ((int)data->regs[ICS932S401_REG_CPU_M_CTRL] & 0x40) << 3;

	freq = BASE_CLOCK * (n + 8) / (m + 2);
	freq /= divisors[data->regs[ICS932S401_REG_CPU_DIVISOR] >>
			 ICS932S401_CPU_DIVISOR_SHIFT];

	return freq;
}

static ssize_t show_cpu_clock(struct device *dev,
			      struct device_attribute *devattr,
			      char *buf)
{
	struct ics932s401_data *data = ics932s401_update_device(dev);

	return sprintf(buf, "%d\n", calculate_cpu_freq(data));
}

static ssize_t show_cpu_clock_sel(struct device *dev,
				  struct device_attribute *devattr,
				  char *buf)
{
	struct ics932s401_data *data = ics932s401_update_device(dev);
	int freq;

	if (data->regs[ICS932S401_REG_CTRL] & ICS932S401_MN_ENABLED)
		freq = calculate_cpu_freq(data);
	else {
		/* Freq is neatly wrapped up for us */
		int fid = data->regs[ICS932S401_REG_CFG7] & ICS932S401_FS_MASK;
		freq = fs_speeds[fid];
		if (data->regs[ICS932S401_REG_CTRL] & ICS932S401_CPU_ALT) {
			switch (freq) {
			case 166666:
				freq = 160000;
				break;
			case 333333:
				freq = 320000;
				break;
			}
		}
	}

	return sprintf(buf, "%d\n", freq);
}

/* Calculate SRC frequency from the M/N registers. */
static int calculate_src_freq(struct ics932s401_data *data)
{
	int m, n, freq;

	m = data->regs[ICS932S401_REG_SRC_M_CTRL] & ICS932S401_M_MASK;
	n = data->regs[ICS932S401_REG_SRC_N_CTRL];

	/* Pull in bits 8 & 9 from the M register */
	n |= ((int)data->regs[ICS932S401_REG_SRC_M_CTRL] & 0x80) << 1;
	n |= ((int)data->regs[ICS932S401_REG_SRC_M_CTRL] & 0x40) << 3;

	freq = BASE_CLOCK * (n + 8) / (m + 2);
	freq /= divisors[data->regs[ICS932S401_REG_PCISRC_DIVISOR] &
			 ICS932S401_SRC_DIVISOR_MASK];

	return freq;
}

static ssize_t show_src_clock(struct device *dev,
			      struct device_attribute *devattr,
			      char *buf)
{
	struct ics932s401_data *data = ics932s401_update_device(dev);

	return sprintf(buf, "%d\n", calculate_src_freq(data));
}

static ssize_t show_src_clock_sel(struct device *dev,
				  struct device_attribute *devattr,
				  char *buf)
{
	struct ics932s401_data *data = ics932s401_update_device(dev);
	int freq;

	if (data->regs[ICS932S401_REG_CTRL] & ICS932S401_MN_ENABLED)
		freq = calculate_src_freq(data);
	else
		/* Freq is neatly wrapped up for us */
		if (data->regs[ICS932S401_REG_CTRL] & ICS932S401_CPU_ALT &&
		    data->regs[ICS932S401_REG_CTRL] & ICS932S401_SRC_ALT)
			freq = 96000;
		else
			freq = 100000;

	return sprintf(buf, "%d\n", freq);
}

/* Calculate PCI frequency from the SRC M/N registers. */
static int calculate_pci_freq(struct ics932s401_data *data)
{
	int m, n, freq;

	m = data->regs[ICS932S401_REG_SRC_M_CTRL] & ICS932S401_M_MASK;
	n = data->regs[ICS932S401_REG_SRC_N_CTRL];

	/* Pull in bits 8 & 9 from the M register */
	n |= ((int)data->regs[ICS932S401_REG_SRC_M_CTRL] & 0x80) << 1;
	n |= ((int)data->regs[ICS932S401_REG_SRC_M_CTRL] & 0x40) << 3;

	freq = BASE_CLOCK * (n + 8) / (m + 2);
	freq /= divisors[data->regs[ICS932S401_REG_PCISRC_DIVISOR] >>
			 ICS932S401_PCI_DIVISOR_SHIFT];

	return freq;
}

static ssize_t show_pci_clock(struct device *dev,
			      struct device_attribute *devattr,
			      char *buf)
{
	struct ics932s401_data *data = ics932s401_update_device(dev);

	return sprintf(buf, "%d\n", calculate_pci_freq(data));
}

static ssize_t show_pci_clock_sel(struct device *dev,
				  struct device_attribute *devattr,
				  char *buf)
{
	struct ics932s401_data *data = ics932s401_update_device(dev);
	int freq;

	if (data->regs[ICS932S401_REG_CTRL] & ICS932S401_MN_ENABLED)
		freq = calculate_pci_freq(data);
	else
		freq = 33333;

	return sprintf(buf, "%d\n", freq);
}

static ssize_t show_value(struct device *dev,
			  struct device_attribute *devattr,
			  char *buf);

static ssize_t show_spread(struct device *dev,
			   struct device_attribute *devattr,
			   char *buf);

static DEVICE_ATTR(spread_enabled, S_IRUGO, show_spread_enabled, NULL);
static DEVICE_ATTR(cpu_clock_selection, S_IRUGO, show_cpu_clock_sel, NULL);
static DEVICE_ATTR(cpu_clock, S_IRUGO, show_cpu_clock, NULL);
static DEVICE_ATTR(src_clock_selection, S_IRUGO, show_src_clock_sel, NULL);
static DEVICE_ATTR(src_clock, S_IRUGO, show_src_clock, NULL);
static DEVICE_ATTR(pci_clock_selection, S_IRUGO, show_pci_clock_sel, NULL);
static DEVICE_ATTR(pci_clock, S_IRUGO, show_pci_clock, NULL);
static DEVICE_ATTR(usb_clock, S_IRUGO, show_value, NULL);
static DEVICE_ATTR(ref_clock, S_IRUGO, show_value, NULL);
static DEVICE_ATTR(cpu_spread, S_IRUGO, show_spread, NULL);
static DEVICE_ATTR(src_spread, S_IRUGO, show_spread, NULL);

static struct attribute *ics932s401_attr[] =
{
	&dev_attr_spread_enabled.attr,
	&dev_attr_cpu_clock_selection.attr,
	&dev_attr_cpu_clock.attr,
	&dev_attr_src_clock_selection.attr,
	&dev_attr_src_clock.attr,
	&dev_attr_pci_clock_selection.attr,
	&dev_attr_pci_clock.attr,
	&dev_attr_usb_clock.attr,
	&dev_attr_ref_clock.attr,
	&dev_attr_cpu_spread.attr,
	&dev_attr_src_spread.attr,
	NULL
};

static ssize_t show_value(struct device *dev,
			  struct device_attribute *devattr,
			  char *buf)
{
	int x;

	if (devattr == &dev_attr_usb_clock)
		x = 48000;
	else if (devattr == &dev_attr_ref_clock)
		x = BASE_CLOCK;
	else
		BUG();

	return sprintf(buf, "%d\n", x);
}

static ssize_t show_spread(struct device *dev,
			   struct device_attribute *devattr,
			   char *buf)
{
	struct ics932s401_data *data = ics932s401_update_device(dev);
	int reg;
	unsigned long val;

	if (!(data->regs[ICS932S401_REG_CFG2] & ICS932S401_CFG1_SPREAD))
		return sprintf(buf, "0%%\n");

	if (devattr == &dev_attr_src_spread)
		reg = ICS932S401_REG_SRC_SPREAD1;
	else if (devattr == &dev_attr_cpu_spread)
		reg = ICS932S401_REG_CPU_SPREAD1;
	else
		BUG();

	val = data->regs[reg] | (data->regs[reg + 1] << 8);
	val &= ICS932S401_SPREAD_MASK;

	/* Scale 0..2^14 to -0.5. */
	val = 500000 * val / 16384;
	return sprintf(buf, "-0.%lu%%\n", val);
}

/* Return 0 if detection is successful, -ENODEV otherwise */
static int ics932s401_detect(struct i2c_client *client, int kind,
			  struct i2c_board_info *info)
{
	struct i2c_adapter *adapter = client->adapter;

	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
		return -ENODEV;

	if (kind <= 0) {
		int vendor, device, revision;

		vendor = i2c_smbus_read_word_data(client,
						  ICS932S401_REG_VENDOR_REV);
		vendor >>= 8;
		revision = vendor >> ICS932S401_REV_SHIFT;
		vendor &= ICS932S401_VENDOR_MASK;
		if (vendor != ICS932S401_VENDOR)
			return -ENODEV;

		device = i2c_smbus_read_word_data(client,
						  ICS932S401_REG_DEVICE);
		device >>= 8;
		if (device != ICS932S401_DEVICE)
			return -ENODEV;

		if (revision != ICS932S401_REV)
			dev_info(&adapter->dev, "Unknown revision %d\n",
				 revision);
	} else
		dev_dbg(&adapter->dev, "detection forced\n");

	strlcpy(info->type, "ics932s401", I2C_NAME_SIZE);

	return 0;
}

static int ics932s401_probe(struct i2c_client *client,
			 const struct i2c_device_id *id)
{
	struct ics932s401_data *data;
	int err;

	data = kzalloc(sizeof(struct ics932s401_data), GFP_KERNEL);
	if (!data) {
		err = -ENOMEM;
		goto exit;
	}

	i2c_set_clientdata(client, data);
	mutex_init(&data->lock);

	dev_info(&client->dev, "%s chip found\n", client->name);

	/* Register sysfs hooks */
	data->attrs.attrs = ics932s401_attr;
	err = sysfs_create_group(&client->dev.kobj, &data->attrs);
	if (err)
		goto exit_free;

	return 0;

exit_free:
	kfree(data);
exit:
	return err;
}

static int ics932s401_remove(struct i2c_client *client)
{
	struct ics932s401_data *data = i2c_get_clientdata(client);

	sysfs_remove_group(&client->dev.kobj, &data->attrs);
	kfree(data);
	return 0;
}

static int __init ics932s401_init(void)
{
	return i2c_add_driver(&ics932s401_driver);
}

static void __exit ics932s401_exit(void)
{
	i2c_del_driver(&ics932s401_driver);
}

MODULE_AUTHOR("Darrick J. Wong <[email protected]>");
MODULE_DESCRIPTION("ICS932S401 driver");
MODULE_LICENSE("GPL");

module_init(ics932s401_init);
module_exit(ics932s401_exit);

/* IBM IntelliStation Z30 */
MODULE_ALIAS("dmi:bvnIBM:*:rn9228:*");
MODULE_ALIAS("dmi:bvnIBM:*:rn9232:*");

/* IBM x3650/x3550 */
MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3650*");
MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3550*");
Commit	Line	Data
a412ae3f DW	1	/*
	2	* A driver for the Integrated Circuits ICS932S401
	3	* Copyright (C) 2008 IBM
	4	*
	5	* Author: Darrick J. Wong <[email protected]>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	20	*/
	21
	22	#include <linux/module.h>
	23	#include <linux/jiffies.h>
	24	#include <linux/i2c.h>
	25	#include <linux/err.h>
	26	#include <linux/mutex.h>
	27	#include <linux/delay.h>
	28	#include <linux/log2.h>
	29
	30	/* Addresses to scan */
	31	static const unsigned short normal_i2c[] = { 0x69, I2C_CLIENT_END };
	32
	33	/* Insmod parameters */
	34	I2C_CLIENT_INSMOD_1(ics932s401);
	35
	36	/* ICS932S401 registers */
	37	#define ICS932S401_REG_CFG2 0x01
	38	#define ICS932S401_CFG1_SPREAD 0x01
	39	#define ICS932S401_REG_CFG7 0x06
	40	#define ICS932S401_FS_MASK 0x07
	41	#define ICS932S401_REG_VENDOR_REV 0x07
	42	#define ICS932S401_VENDOR 1
	43	#define ICS932S401_VENDOR_MASK 0x0F
	44	#define ICS932S401_REV 4
	45	#define ICS932S401_REV_SHIFT 4
	46	#define ICS932S401_REG_DEVICE 0x09
	47	#define ICS932S401_DEVICE 11
	48	#define ICS932S401_REG_CTRL 0x0A
	49	#define ICS932S401_MN_ENABLED 0x80
	50	#define ICS932S401_CPU_ALT 0x04
	51	#define ICS932S401_SRC_ALT 0x08
	52	#define ICS932S401_REG_CPU_M_CTRL 0x0B
	53	#define ICS932S401_M_MASK 0x3F
	54	#define ICS932S401_REG_CPU_N_CTRL 0x0C
	55	#define ICS932S401_REG_CPU_SPREAD1 0x0D
	56	#define ICS932S401_REG_CPU_SPREAD2 0x0E
	57	#define ICS932S401_SPREAD_MASK 0x7FFF
	58	#define ICS932S401_REG_SRC_M_CTRL 0x0F
	59	#define ICS932S401_REG_SRC_N_CTRL 0x10
	60	#define ICS932S401_REG_SRC_SPREAD1 0x11
	61	#define ICS932S401_REG_SRC_SPREAD2 0x12
	62	#define ICS932S401_REG_CPU_DIVISOR 0x13
	63	#define ICS932S401_CPU_DIVISOR_SHIFT 4
	64	#define ICS932S401_REG_PCISRC_DIVISOR 0x14
65	#define ICS932S401_SRC_DIVISOR_MASK 0x0F
66	#define ICS932S401_PCI_DIVISOR_SHIFT 4
67
68	/* Base clock is 14.318MHz */
69	#define BASE_CLOCK 14318
70
71	#define NUM_REGS 21
72	#define NUM_MIRRORED_REGS 15
73
74	static int regs_to_copy[NUM_MIRRORED_REGS] = {
75	ICS932S401_REG_CFG2,
76	ICS932S401_REG_CFG7,
77	ICS932S401_REG_VENDOR_REV,
78	ICS932S401_REG_DEVICE,
79	ICS932S401_REG_CTRL,
80	ICS932S401_REG_CPU_M_CTRL,
81	ICS932S401_REG_CPU_N_CTRL,
82	ICS932S401_REG_CPU_SPREAD1,
83	ICS932S401_REG_CPU_SPREAD2,
84	ICS932S401_REG_SRC_M_CTRL,
85	ICS932S401_REG_SRC_N_CTRL,
86	ICS932S401_REG_SRC_SPREAD1,
87	ICS932S401_REG_SRC_SPREAD2,
88	ICS932S401_REG_CPU_DIVISOR,
89	ICS932S401_REG_PCISRC_DIVISOR,
90	};
91
92	/* How often do we reread sensors values? (In jiffies) */
93	#define SENSOR_REFRESH_INTERVAL (2 * HZ)
94
95	/* How often do we reread sensor limit values? (In jiffies) */
96	#define LIMIT_REFRESH_INTERVAL (60 * HZ)
97
98	struct ics932s401_data {
99	struct attribute_group attrs;
100	struct mutex lock;
101	char sensors_valid;
102	unsigned long sensors_last_updated; /* In jiffies */
103
104	u8 regs[NUM_REGS];
105	};
106
107	static int ics932s401_probe(struct i2c_client *client,
108	const struct i2c_device_id *id);
109	static int ics932s401_detect(struct i2c_client *client, int kind,
110	struct i2c_board_info *info);
111	static int ics932s401_remove(struct i2c_client *client);
112
113	static const struct i2c_device_id ics932s401_id[] = {
114	{ "ics932s401", ics932s401 },
115	{ }
116	};
117	MODULE_DEVICE_TABLE(i2c, ics932s401_id);
118
119	static struct i2c_driver ics932s401_driver = {
120	.class = I2C_CLASS_HWMON,
121	.driver = {
122	.name = "ics932s401",
123	},
124	.probe = ics932s401_probe,
125	.remove = ics932s401_remove,
126	.id_table = ics932s401_id,
127	.detect = ics932s401_detect,
128	.address_data = &addr_data,
129	};
130
131	static struct ics932s401_data ics932s401_update_device(struct device dev)
132	{
133	struct i2c_client *client = to_i2c_client(dev);
134	struct ics932s401_data *data = i2c_get_clientdata(client);
135	unsigned long local_jiffies = jiffies;
136	int i, temp;
137
138	mutex_lock(&data->lock);
139	if (time_before(local_jiffies, data->sensors_last_updated +
140	SENSOR_REFRESH_INTERVAL)
141	&& data->sensors_valid)
142	goto out;
143
144	/*
145	* Each register must be read as a word and then right shifted 8 bits.
146	* Not really sure why this is; setting the "byte count programming"
147	* register to 1 does not fix this problem.
148	*/
149	for (i = 0; i < NUM_MIRRORED_REGS; i++) {
150	temp = i2c_smbus_read_word_data(client, regs_to_copy[i]);
151	data->regs[regs_to_copy[i]] = temp >> 8;
152	}
153
154	data->sensors_last_updated = local_jiffies;
155	data->sensors_valid = 1;
156
157	out:
158	mutex_unlock(&data->lock);
159	return data;
160	}
161
162	static ssize_t show_spread_enabled(struct device *dev,
163	struct device_attribute *devattr,
164	char *buf)
165	{
166	struct ics932s401_data *data = ics932s401_update_device(dev);
167
168	if (data->regs[ICS932S401_REG_CFG2] & ICS932S401_CFG1_SPREAD)
169	return sprintf(buf, "1\n");
170
171	return sprintf(buf, "0\n");
172	}
173
174	/* bit to cpu khz map */
175	static const int fs_speeds[] = {
176	266666,
177	133333,
178	200000,
179	166666,
180	333333,
181	100000,
182	400000,
183	0,
184	};
185
186	/* clock divisor map */
187	static const int divisors[] = {2, 3, 5, 15, 4, 6, 10, 30, 8, 12, 20, 60, 16,
188	24, 40, 120};
189
190	/* Calculate CPU frequency from the M/N registers. */
191	static int calculate_cpu_freq(struct ics932s401_data *data)
192	{
193	int m, n, freq;
194
195	m = data->regs[ICS932S401_REG_CPU_M_CTRL] & ICS932S401_M_MASK;
196	n = data->regs[ICS932S401_REG_CPU_N_CTRL];
197
198	/* Pull in bits 8 & 9 from the M register */
199	n \|= ((int)data->regs[ICS932S401_REG_CPU_M_CTRL] & 0x80) << 1;
200	n \|= ((int)data->regs[ICS932S401_REG_CPU_M_CTRL] & 0x40) << 3;
201
202	freq = BASE_CLOCK * (n + 8) / (m + 2);
203	freq /= divisors[data->regs[ICS932S401_REG_CPU_DIVISOR] >>
204	ICS932S401_CPU_DIVISOR_SHIFT];
205
206	return freq;
207	}
208
209	static ssize_t show_cpu_clock(struct device *dev,
210	struct device_attribute *devattr,
211	char *buf)
212	{
213	struct ics932s401_data *data = ics932s401_update_device(dev);
214
215	return sprintf(buf, "%d\n", calculate_cpu_freq(data));
216	}
217
218	static ssize_t show_cpu_clock_sel(struct device *dev,
219	struct device_attribute *devattr,
220	char *buf)
221	{
222	struct ics932s401_data *data = ics932s401_update_device(dev);
223	int freq;
224
225	if (data->regs[ICS932S401_REG_CTRL] & ICS932S401_MN_ENABLED)
226	freq = calculate_cpu_freq(data);
227	else {
228	/* Freq is neatly wrapped up for us */
229	int fid = data->regs[ICS932S401_REG_CFG7] & ICS932S401_FS_MASK;
230	freq = fs_speeds[fid];
231	if (data->regs[ICS932S401_REG_CTRL] & ICS932S401_CPU_ALT) {
232	switch (freq) {
233	case 166666:
234	freq = 160000;
235	break;
236	case 333333:
237	freq = 320000;
238	break;
239	}
240	}
241	}
242
243	return sprintf(buf, "%d\n", freq);
244	}
245
246	/* Calculate SRC frequency from the M/N registers. */
247	static int calculate_src_freq(struct ics932s401_data *data)
248	{
249	int m, n, freq;
250
251	m = data->regs[ICS932S401_REG_SRC_M_CTRL] & ICS932S401_M_MASK;
252	n = data->regs[ICS932S401_REG_SRC_N_CTRL];
253
254	/* Pull in bits 8 & 9 from the M register */
255	n \|= ((int)data->regs[ICS932S401_REG_SRC_M_CTRL] & 0x80) << 1;
256	n \|= ((int)data->regs[ICS932S401_REG_SRC_M_CTRL] & 0x40) << 3;
257
258	freq = BASE_CLOCK * (n + 8) / (m + 2);
259	freq /= divisors[data->regs[ICS932S401_REG_PCISRC_DIVISOR] &
260	ICS932S401_SRC_DIVISOR_MASK];
261
262	return freq;
263	}
264
265	static ssize_t show_src_clock(struct device *dev,
266	struct device_attribute *devattr,
267	char *buf)
268	{
269	struct ics932s401_data *data = ics932s401_update_device(dev);
270
271	return sprintf(buf, "%d\n", calculate_src_freq(data));
272	}
273
274	static ssize_t show_src_clock_sel(struct device *dev,
275	struct device_attribute *devattr,
276	char *buf)
277	{
278	struct ics932s401_data *data = ics932s401_update_device(dev);
279	int freq;
280
281	if (data->regs[ICS932S401_REG_CTRL] & ICS932S401_MN_ENABLED)
282	freq = calculate_src_freq(data);
283	else
284	/* Freq is neatly wrapped up for us */
285	if (data->regs[ICS932S401_REG_CTRL] & ICS932S401_CPU_ALT &&
286	data->regs[ICS932S401_REG_CTRL] & ICS932S401_SRC_ALT)
287	freq = 96000;
288	else
289	freq = 100000;
290
291	return sprintf(buf, "%d\n", freq);
292	}
293
294	/* Calculate PCI frequency from the SRC M/N registers. */
295	static int calculate_pci_freq(struct ics932s401_data *data)
296	{
297	int m, n, freq;
298
299	m = data->regs[ICS932S401_REG_SRC_M_CTRL] & ICS932S401_M_MASK;
300	n = data->regs[ICS932S401_REG_SRC_N_CTRL];
301
302	/* Pull in bits 8 & 9 from the M register */
303	n \|= ((int)data->regs[ICS932S401_REG_SRC_M_CTRL] & 0x80) << 1;
304	n \|= ((int)data->regs[ICS932S401_REG_SRC_M_CTRL] & 0x40) << 3;
305
306	freq = BASE_CLOCK * (n + 8) / (m + 2);
307	freq /= divisors[data->regs[ICS932S401_REG_PCISRC_DIVISOR] >>
308	ICS932S401_PCI_DIVISOR_SHIFT];
309
310	return freq;
311	}
312
313	static ssize_t show_pci_clock(struct device *dev,
314	struct device_attribute *devattr,
315	char *buf)
316	{
317	struct ics932s401_data *data = ics932s401_update_device(dev);
318
319	return sprintf(buf, "%d\n", calculate_pci_freq(data));
320	}
321
322	static ssize_t show_pci_clock_sel(struct device *dev,
323	struct device_attribute *devattr,
324	char *buf)
325	{
326	struct ics932s401_data *data = ics932s401_update_device(dev);
327	int freq;
328
329	if (data->regs[ICS932S401_REG_CTRL] & ICS932S401_MN_ENABLED)
330	freq = calculate_pci_freq(data);
331	else
332	freq = 33333;
333
334	return sprintf(buf, "%d\n", freq);
335	}
336
337	static ssize_t show_value(struct device *dev,
338	struct device_attribute *devattr,
339	char *buf);
340
341	static ssize_t show_spread(struct device *dev,
342	struct device_attribute *devattr,
343	char *buf);
344
345	static DEVICE_ATTR(spread_enabled, S_IRUGO, show_spread_enabled, NULL);
346	static DEVICE_ATTR(cpu_clock_selection, S_IRUGO, show_cpu_clock_sel, NULL);
347	static DEVICE_ATTR(cpu_clock, S_IRUGO, show_cpu_clock, NULL);
348	static DEVICE_ATTR(src_clock_selection, S_IRUGO, show_src_clock_sel, NULL);
349	static DEVICE_ATTR(src_clock, S_IRUGO, show_src_clock, NULL);
350	static DEVICE_ATTR(pci_clock_selection, S_IRUGO, show_pci_clock_sel, NULL);
351	static DEVICE_ATTR(pci_clock, S_IRUGO, show_pci_clock, NULL);
352	static DEVICE_ATTR(usb_clock, S_IRUGO, show_value, NULL);
353	static DEVICE_ATTR(ref_clock, S_IRUGO, show_value, NULL);
354	static DEVICE_ATTR(cpu_spread, S_IRUGO, show_spread, NULL);
355	static DEVICE_ATTR(src_spread, S_IRUGO, show_spread, NULL);
356
357	static struct attribute *ics932s401_attr[] =
358	{
359	&dev_attr_spread_enabled.attr,
360	&dev_attr_cpu_clock_selection.attr,
361	&dev_attr_cpu_clock.attr,
362	&dev_attr_src_clock_selection.attr,
363	&dev_attr_src_clock.attr,
364	&dev_attr_pci_clock_selection.attr,
365	&dev_attr_pci_clock.attr,
366	&dev_attr_usb_clock.attr,
367	&dev_attr_ref_clock.attr,
368	&dev_attr_cpu_spread.attr,
369	&dev_attr_src_spread.attr,
370	NULL
371	};
372
373	static ssize_t show_value(struct device *dev,
374	struct device_attribute *devattr,
375	char *buf)
376	{
377	int x;
378
379	if (devattr == &dev_attr_usb_clock)
380	x = 48000;
381	else if (devattr == &dev_attr_ref_clock)
382	x = BASE_CLOCK;
383	else
384	BUG();
385
386	return sprintf(buf, "%d\n", x);
387	}
388
389	static ssize_t show_spread(struct device *dev,
390	struct device_attribute *devattr,
391	char *buf)
392	{
393	struct ics932s401_data *data = ics932s401_update_device(dev);
394	int reg;
395	unsigned long val;
396
397	if (!(data->regs[ICS932S401_REG_CFG2] & ICS932S401_CFG1_SPREAD))
398	return sprintf(buf, "0%%\n");
399
400	if (devattr == &dev_attr_src_spread)
401	reg = ICS932S401_REG_SRC_SPREAD1;
402	else if (devattr == &dev_attr_cpu_spread)
403	reg = ICS932S401_REG_CPU_SPREAD1;
404	else
405	BUG();
406
407	val = data->regs[reg] \| (data->regs[reg + 1] << 8);
408	val &= ICS932S401_SPREAD_MASK;
409
410	/* Scale 0..2^14 to -0.5. */
411	val = 500000 * val / 16384;
412	return sprintf(buf, "-0.%lu%%\n", val);
413	}
414
415	/* Return 0 if detection is successful, -ENODEV otherwise */
416	static int ics932s401_detect(struct i2c_client *client, int kind,
417	struct i2c_board_info *info)
418	{
419	struct i2c_adapter *adapter = client->adapter;
420
421	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
422	return -ENODEV;
423
424	if (kind <= 0) {
425	int vendor, device, revision;
426
427	vendor = i2c_smbus_read_word_data(client,
428	ICS932S401_REG_VENDOR_REV);
429	vendor >>= 8;
430	revision = vendor >> ICS932S401_REV_SHIFT;
431	vendor &= ICS932S401_VENDOR_MASK;
432	if (vendor != ICS932S401_VENDOR)
433	return -ENODEV;
434
435	device = i2c_smbus_read_word_data(client,
436	ICS932S401_REG_DEVICE);
437	device >>= 8;
438	if (device != ICS932S401_DEVICE)
439	return -ENODEV;
440
441	if (revision != ICS932S401_REV)
442	dev_info(&adapter->dev, "Unknown revision %d\n",
443	revision);
444	} else
445	dev_dbg(&adapter->dev, "detection forced\n");
446
447	strlcpy(info->type, "ics932s401", I2C_NAME_SIZE);
448
449	return 0;
450	}
451
452	static int ics932s401_probe(struct i2c_client *client,
453	const struct i2c_device_id *id)
454	{
455	struct ics932s401_data *data;
456	int err;
457
458	data = kzalloc(sizeof(struct ics932s401_data), GFP_KERNEL);
459	if (!data) {
460	err = -ENOMEM;
461	goto exit;
462	}
463
464	i2c_set_clientdata(client, data);
465	mutex_init(&data->lock);
466
467	dev_info(&client->dev, "%s chip found\n", client->name);
468
469	/* Register sysfs hooks */
470	data->attrs.attrs = ics932s401_attr;
471	err = sysfs_create_group(&client->dev.kobj, &data->attrs);
472	if (err)
473	goto exit_free;
474
475	return 0;
476
477	exit_free:
478	kfree(data);
479	exit:
480	return err;
481	}
482
483	static int ics932s401_remove(struct i2c_client *client)
484	{
485	struct ics932s401_data *data = i2c_get_clientdata(client);
486
487	sysfs_remove_group(&client->dev.kobj, &data->attrs);
488	kfree(data);
489	return 0;
490	}
491
492	static int __init ics932s401_init(void)
493	{
494	return i2c_add_driver(&ics932s401_driver);
495	}
496
497	static void __exit ics932s401_exit(void)
498	{
499	i2c_del_driver(&ics932s401_driver);
500	}
501
502	MODULE_AUTHOR("Darrick J. Wong <[email protected]>");
503	MODULE_DESCRIPTION("ICS932S401 driver");
504	MODULE_LICENSE("GPL");
505
506	module_init(ics932s401_init);
507	module_exit(ics932s401_exit);
508
509	/* IBM IntelliStation Z30 */
510	MODULE_ALIAS("dmi:bvnIBM::rn9228:");
511	MODULE_ALIAS("dmi:bvnIBM::rn9232:");
512
513	/* IBM x3650/x3550 */
514	MODULE_ALIAS("dmi:bvnIBM::pnIBMSystemx3650");
515	MODULE_ALIAS("dmi:bvnIBM::pnIBMSystemx3550");