/* * A driver for the Integrated Circuits ICS932S401 * Copyright (C) 2008 IBM * * Author: Darrick J. Wong <djwong@us.ibm.com> * * 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 <djwong@us.ibm.com>"); 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*");