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681c6f7a67
hwmon: Fix unchecked return status, batch 3 Fix up some hwmon drivers so that they no longer ignore return status from device_create_file(). Signed-off-by: Mark M. Hoffman <mhoffman@lightlink.com> Signed-off-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
613 lines
18 KiB
C
613 lines
18 KiB
C
/*
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* adm1025.c
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*
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* Copyright (C) 2000 Chen-Yuan Wu <gwu@esoft.com>
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* Copyright (C) 2003-2004 Jean Delvare <khali@linux-fr.org>
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*
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* The ADM1025 is a sensor chip made by Analog Devices. It reports up to 6
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* voltages (including its own power source) and up to two temperatures
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* (its own plus up to one external one). Voltages are scaled internally
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* (which is not the common way) with ratios such that the nominal value
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* of each voltage correspond to a register value of 192 (which means a
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* resolution of about 0.5% of the nominal value). Temperature values are
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* reported with a 1 deg resolution and a 3 deg accuracy. Complete
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* datasheet can be obtained from Analog's website at:
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* http://www.analog.com/Analog_Root/productPage/productHome/0,2121,ADM1025,00.html
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*
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* This driver also supports the ADM1025A, which differs from the ADM1025
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* only in that it has "open-drain VID inputs while the ADM1025 has
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* on-chip 100k pull-ups on the VID inputs". It doesn't make any
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* difference for us.
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*
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* This driver also supports the NE1619, a sensor chip made by Philips.
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* That chip is similar to the ADM1025A, with a few differences. The only
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* difference that matters to us is that the NE1619 has only two possible
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* addresses while the ADM1025A has a third one. Complete datasheet can be
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* obtained from Philips's website at:
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* http://www.semiconductors.philips.com/pip/NE1619DS.html
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*
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* Since the ADM1025 was the first chipset supported by this driver, most
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* comments will refer to this chipset, but are actually general and
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* concern all supported chipsets, unless mentioned otherwise.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/jiffies.h>
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#include <linux/i2c.h>
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#include <linux/hwmon.h>
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#include <linux/hwmon-vid.h>
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#include <linux/err.h>
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#include <linux/mutex.h>
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/*
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* Addresses to scan
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* ADM1025 and ADM1025A have three possible addresses: 0x2c, 0x2d and 0x2e.
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* NE1619 has two possible addresses: 0x2c and 0x2d.
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*/
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static unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };
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/*
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* Insmod parameters
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*/
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I2C_CLIENT_INSMOD_2(adm1025, ne1619);
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/*
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* The ADM1025 registers
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*/
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#define ADM1025_REG_MAN_ID 0x3E
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#define ADM1025_REG_CHIP_ID 0x3F
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#define ADM1025_REG_CONFIG 0x40
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#define ADM1025_REG_STATUS1 0x41
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#define ADM1025_REG_STATUS2 0x42
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#define ADM1025_REG_IN(nr) (0x20 + (nr))
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#define ADM1025_REG_IN_MAX(nr) (0x2B + (nr) * 2)
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#define ADM1025_REG_IN_MIN(nr) (0x2C + (nr) * 2)
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#define ADM1025_REG_TEMP(nr) (0x26 + (nr))
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#define ADM1025_REG_TEMP_HIGH(nr) (0x37 + (nr) * 2)
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#define ADM1025_REG_TEMP_LOW(nr) (0x38 + (nr) * 2)
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#define ADM1025_REG_VID 0x47
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#define ADM1025_REG_VID4 0x49
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/*
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* Conversions and various macros
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* The ADM1025 uses signed 8-bit values for temperatures.
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*/
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static int in_scale[6] = { 2500, 2250, 3300, 5000, 12000, 3300 };
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#define IN_FROM_REG(reg,scale) (((reg) * (scale) + 96) / 192)
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#define IN_TO_REG(val,scale) ((val) <= 0 ? 0 : \
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(val) * 192 >= (scale) * 255 ? 255 : \
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((val) * 192 + (scale)/2) / (scale))
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#define TEMP_FROM_REG(reg) ((reg) * 1000)
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#define TEMP_TO_REG(val) ((val) <= -127500 ? -128 : \
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(val) >= 126500 ? 127 : \
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(((val) < 0 ? (val)-500 : (val)+500) / 1000))
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/*
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* Functions declaration
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*/
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static int adm1025_attach_adapter(struct i2c_adapter *adapter);
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static int adm1025_detect(struct i2c_adapter *adapter, int address, int kind);
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static void adm1025_init_client(struct i2c_client *client);
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static int adm1025_detach_client(struct i2c_client *client);
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static struct adm1025_data *adm1025_update_device(struct device *dev);
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/*
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* Driver data (common to all clients)
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*/
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static struct i2c_driver adm1025_driver = {
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.driver = {
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.name = "adm1025",
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},
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.id = I2C_DRIVERID_ADM1025,
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.attach_adapter = adm1025_attach_adapter,
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.detach_client = adm1025_detach_client,
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};
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/*
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* Client data (each client gets its own)
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*/
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struct adm1025_data {
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struct i2c_client client;
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struct class_device *class_dev;
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struct mutex update_lock;
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char valid; /* zero until following fields are valid */
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unsigned long last_updated; /* in jiffies */
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u8 in[6]; /* register value */
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u8 in_max[6]; /* register value */
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u8 in_min[6]; /* register value */
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s8 temp[2]; /* register value */
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s8 temp_min[2]; /* register value */
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s8 temp_max[2]; /* register value */
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u16 alarms; /* register values, combined */
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u8 vid; /* register values, combined */
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u8 vrm;
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};
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/*
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* Sysfs stuff
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*/
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#define show_in(offset) \
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static ssize_t show_in##offset(struct device *dev, struct device_attribute *attr, char *buf) \
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{ \
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struct adm1025_data *data = adm1025_update_device(dev); \
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return sprintf(buf, "%u\n", IN_FROM_REG(data->in[offset], \
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in_scale[offset])); \
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} \
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static ssize_t show_in##offset##_min(struct device *dev, struct device_attribute *attr, char *buf) \
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{ \
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struct adm1025_data *data = adm1025_update_device(dev); \
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return sprintf(buf, "%u\n", IN_FROM_REG(data->in_min[offset], \
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in_scale[offset])); \
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} \
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static ssize_t show_in##offset##_max(struct device *dev, struct device_attribute *attr, char *buf) \
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{ \
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struct adm1025_data *data = adm1025_update_device(dev); \
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return sprintf(buf, "%u\n", IN_FROM_REG(data->in_max[offset], \
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in_scale[offset])); \
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} \
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static DEVICE_ATTR(in##offset##_input, S_IRUGO, show_in##offset, NULL);
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show_in(0);
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show_in(1);
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show_in(2);
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show_in(3);
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show_in(4);
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show_in(5);
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#define show_temp(offset) \
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static ssize_t show_temp##offset(struct device *dev, struct device_attribute *attr, char *buf) \
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{ \
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struct adm1025_data *data = adm1025_update_device(dev); \
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return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[offset-1])); \
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} \
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static ssize_t show_temp##offset##_min(struct device *dev, struct device_attribute *attr, char *buf) \
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{ \
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struct adm1025_data *data = adm1025_update_device(dev); \
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return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_min[offset-1])); \
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} \
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static ssize_t show_temp##offset##_max(struct device *dev, struct device_attribute *attr, char *buf) \
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{ \
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struct adm1025_data *data = adm1025_update_device(dev); \
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return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_max[offset-1])); \
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}\
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static DEVICE_ATTR(temp##offset##_input, S_IRUGO, show_temp##offset, NULL);
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show_temp(1);
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show_temp(2);
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#define set_in(offset) \
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static ssize_t set_in##offset##_min(struct device *dev, struct device_attribute *attr, const char *buf, \
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size_t count) \
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{ \
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struct i2c_client *client = to_i2c_client(dev); \
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struct adm1025_data *data = i2c_get_clientdata(client); \
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long val = simple_strtol(buf, NULL, 10); \
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\
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mutex_lock(&data->update_lock); \
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data->in_min[offset] = IN_TO_REG(val, in_scale[offset]); \
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i2c_smbus_write_byte_data(client, ADM1025_REG_IN_MIN(offset), \
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data->in_min[offset]); \
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mutex_unlock(&data->update_lock); \
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return count; \
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} \
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static ssize_t set_in##offset##_max(struct device *dev, struct device_attribute *attr, const char *buf, \
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size_t count) \
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{ \
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struct i2c_client *client = to_i2c_client(dev); \
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struct adm1025_data *data = i2c_get_clientdata(client); \
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long val = simple_strtol(buf, NULL, 10); \
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\
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mutex_lock(&data->update_lock); \
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data->in_max[offset] = IN_TO_REG(val, in_scale[offset]); \
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i2c_smbus_write_byte_data(client, ADM1025_REG_IN_MAX(offset), \
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data->in_max[offset]); \
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mutex_unlock(&data->update_lock); \
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return count; \
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} \
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static DEVICE_ATTR(in##offset##_min, S_IWUSR | S_IRUGO, \
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show_in##offset##_min, set_in##offset##_min); \
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static DEVICE_ATTR(in##offset##_max, S_IWUSR | S_IRUGO, \
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show_in##offset##_max, set_in##offset##_max);
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set_in(0);
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set_in(1);
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set_in(2);
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set_in(3);
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set_in(4);
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set_in(5);
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#define set_temp(offset) \
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static ssize_t set_temp##offset##_min(struct device *dev, struct device_attribute *attr, const char *buf, \
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size_t count) \
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{ \
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struct i2c_client *client = to_i2c_client(dev); \
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struct adm1025_data *data = i2c_get_clientdata(client); \
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long val = simple_strtol(buf, NULL, 10); \
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\
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mutex_lock(&data->update_lock); \
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data->temp_min[offset-1] = TEMP_TO_REG(val); \
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i2c_smbus_write_byte_data(client, ADM1025_REG_TEMP_LOW(offset-1), \
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data->temp_min[offset-1]); \
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mutex_unlock(&data->update_lock); \
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return count; \
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} \
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static ssize_t set_temp##offset##_max(struct device *dev, struct device_attribute *attr, const char *buf, \
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size_t count) \
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{ \
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struct i2c_client *client = to_i2c_client(dev); \
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struct adm1025_data *data = i2c_get_clientdata(client); \
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long val = simple_strtol(buf, NULL, 10); \
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\
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mutex_lock(&data->update_lock); \
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data->temp_max[offset-1] = TEMP_TO_REG(val); \
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i2c_smbus_write_byte_data(client, ADM1025_REG_TEMP_HIGH(offset-1), \
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data->temp_max[offset-1]); \
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mutex_unlock(&data->update_lock); \
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return count; \
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} \
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static DEVICE_ATTR(temp##offset##_min, S_IWUSR | S_IRUGO, \
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show_temp##offset##_min, set_temp##offset##_min); \
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static DEVICE_ATTR(temp##offset##_max, S_IWUSR | S_IRUGO, \
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show_temp##offset##_max, set_temp##offset##_max);
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set_temp(1);
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set_temp(2);
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static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct adm1025_data *data = adm1025_update_device(dev);
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return sprintf(buf, "%u\n", data->alarms);
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}
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static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
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static ssize_t show_vid(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct adm1025_data *data = adm1025_update_device(dev);
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return sprintf(buf, "%u\n", vid_from_reg(data->vid, data->vrm));
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}
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static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
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static ssize_t show_vrm(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct adm1025_data *data = adm1025_update_device(dev);
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return sprintf(buf, "%u\n", data->vrm);
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}
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static ssize_t set_vrm(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct adm1025_data *data = i2c_get_clientdata(client);
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data->vrm = simple_strtoul(buf, NULL, 10);
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return count;
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}
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static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm, set_vrm);
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/*
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* Real code
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*/
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static int adm1025_attach_adapter(struct i2c_adapter *adapter)
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{
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if (!(adapter->class & I2C_CLASS_HWMON))
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return 0;
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return i2c_probe(adapter, &addr_data, adm1025_detect);
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}
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static struct attribute *adm1025_attributes[] = {
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&dev_attr_in0_input.attr,
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&dev_attr_in1_input.attr,
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&dev_attr_in2_input.attr,
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&dev_attr_in3_input.attr,
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&dev_attr_in5_input.attr,
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&dev_attr_in0_min.attr,
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&dev_attr_in1_min.attr,
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&dev_attr_in2_min.attr,
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&dev_attr_in3_min.attr,
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&dev_attr_in5_min.attr,
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&dev_attr_in0_max.attr,
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&dev_attr_in1_max.attr,
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&dev_attr_in2_max.attr,
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&dev_attr_in3_max.attr,
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&dev_attr_in5_max.attr,
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&dev_attr_temp1_input.attr,
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&dev_attr_temp2_input.attr,
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&dev_attr_temp1_min.attr,
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&dev_attr_temp2_min.attr,
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&dev_attr_temp1_max.attr,
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&dev_attr_temp2_max.attr,
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&dev_attr_alarms.attr,
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&dev_attr_cpu0_vid.attr,
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&dev_attr_vrm.attr,
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NULL
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};
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static const struct attribute_group adm1025_group = {
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.attrs = adm1025_attributes,
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};
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static struct attribute *adm1025_attributes_opt[] = {
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&dev_attr_in4_input.attr,
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&dev_attr_in4_min.attr,
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&dev_attr_in4_max.attr,
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NULL
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};
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static const struct attribute_group adm1025_group_opt = {
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.attrs = adm1025_attributes_opt,
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};
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/*
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* The following function does more than just detection. If detection
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* succeeds, it also registers the new chip.
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*/
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static int adm1025_detect(struct i2c_adapter *adapter, int address, int kind)
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{
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struct i2c_client *new_client;
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struct adm1025_data *data;
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int err = 0;
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const char *name = "";
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u8 config;
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if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
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goto exit;
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if (!(data = kzalloc(sizeof(struct adm1025_data), GFP_KERNEL))) {
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err = -ENOMEM;
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goto exit;
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}
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/* The common I2C client data is placed right before the
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ADM1025-specific data. */
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new_client = &data->client;
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i2c_set_clientdata(new_client, data);
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new_client->addr = address;
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new_client->adapter = adapter;
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new_client->driver = &adm1025_driver;
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new_client->flags = 0;
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/*
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* Now we do the remaining detection. A negative kind means that
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* the driver was loaded with no force parameter (default), so we
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* must both detect and identify the chip. A zero kind means that
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* the driver was loaded with the force parameter, the detection
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* step shall be skipped. A positive kind means that the driver
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* was loaded with the force parameter and a given kind of chip is
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* requested, so both the detection and the identification steps
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* are skipped.
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*/
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config = i2c_smbus_read_byte_data(new_client, ADM1025_REG_CONFIG);
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if (kind < 0) { /* detection */
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if ((config & 0x80) != 0x00
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|| (i2c_smbus_read_byte_data(new_client,
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ADM1025_REG_STATUS1) & 0xC0) != 0x00
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|| (i2c_smbus_read_byte_data(new_client,
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ADM1025_REG_STATUS2) & 0xBC) != 0x00) {
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dev_dbg(&adapter->dev,
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"ADM1025 detection failed at 0x%02x.\n",
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address);
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goto exit_free;
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}
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}
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if (kind <= 0) { /* identification */
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u8 man_id, chip_id;
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man_id = i2c_smbus_read_byte_data(new_client,
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ADM1025_REG_MAN_ID);
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chip_id = i2c_smbus_read_byte_data(new_client,
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ADM1025_REG_CHIP_ID);
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if (man_id == 0x41) { /* Analog Devices */
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if ((chip_id & 0xF0) == 0x20) { /* ADM1025/ADM1025A */
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kind = adm1025;
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}
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} else
|
|
if (man_id == 0xA1) { /* Philips */
|
|
if (address != 0x2E
|
|
&& (chip_id & 0xF0) == 0x20) { /* NE1619 */
|
|
kind = ne1619;
|
|
}
|
|
}
|
|
|
|
if (kind <= 0) { /* identification failed */
|
|
dev_info(&adapter->dev,
|
|
"Unsupported chip (man_id=0x%02X, "
|
|
"chip_id=0x%02X).\n", man_id, chip_id);
|
|
goto exit_free;
|
|
}
|
|
}
|
|
|
|
if (kind == adm1025) {
|
|
name = "adm1025";
|
|
} else if (kind == ne1619) {
|
|
name = "ne1619";
|
|
}
|
|
|
|
/* We can fill in the remaining client fields */
|
|
strlcpy(new_client->name, name, I2C_NAME_SIZE);
|
|
data->valid = 0;
|
|
mutex_init(&data->update_lock);
|
|
|
|
/* Tell the I2C layer a new client has arrived */
|
|
if ((err = i2c_attach_client(new_client)))
|
|
goto exit_free;
|
|
|
|
/* Initialize the ADM1025 chip */
|
|
adm1025_init_client(new_client);
|
|
|
|
/* Register sysfs hooks */
|
|
if ((err = sysfs_create_group(&new_client->dev.kobj, &adm1025_group)))
|
|
goto exit_detach;
|
|
|
|
/* Pin 11 is either in4 (+12V) or VID4 */
|
|
if (!(config & 0x20)) {
|
|
if ((err = device_create_file(&new_client->dev,
|
|
&dev_attr_in4_input))
|
|
|| (err = device_create_file(&new_client->dev,
|
|
&dev_attr_in4_min))
|
|
|| (err = device_create_file(&new_client->dev,
|
|
&dev_attr_in4_max)))
|
|
goto exit_remove;
|
|
}
|
|
|
|
data->class_dev = hwmon_device_register(&new_client->dev);
|
|
if (IS_ERR(data->class_dev)) {
|
|
err = PTR_ERR(data->class_dev);
|
|
goto exit_remove;
|
|
}
|
|
|
|
return 0;
|
|
|
|
exit_remove:
|
|
sysfs_remove_group(&new_client->dev.kobj, &adm1025_group);
|
|
sysfs_remove_group(&new_client->dev.kobj, &adm1025_group_opt);
|
|
exit_detach:
|
|
i2c_detach_client(new_client);
|
|
exit_free:
|
|
kfree(data);
|
|
exit:
|
|
return err;
|
|
}
|
|
|
|
static void adm1025_init_client(struct i2c_client *client)
|
|
{
|
|
u8 reg;
|
|
struct adm1025_data *data = i2c_get_clientdata(client);
|
|
int i;
|
|
|
|
data->vrm = vid_which_vrm();
|
|
|
|
/*
|
|
* Set high limits
|
|
* Usually we avoid setting limits on driver init, but it happens
|
|
* that the ADM1025 comes with stupid default limits (all registers
|
|
* set to 0). In case the chip has not gone through any limit
|
|
* setting yet, we better set the high limits to the max so that
|
|
* no alarm triggers.
|
|
*/
|
|
for (i=0; i<6; i++) {
|
|
reg = i2c_smbus_read_byte_data(client,
|
|
ADM1025_REG_IN_MAX(i));
|
|
if (reg == 0)
|
|
i2c_smbus_write_byte_data(client,
|
|
ADM1025_REG_IN_MAX(i),
|
|
0xFF);
|
|
}
|
|
for (i=0; i<2; i++) {
|
|
reg = i2c_smbus_read_byte_data(client,
|
|
ADM1025_REG_TEMP_HIGH(i));
|
|
if (reg == 0)
|
|
i2c_smbus_write_byte_data(client,
|
|
ADM1025_REG_TEMP_HIGH(i),
|
|
0x7F);
|
|
}
|
|
|
|
/*
|
|
* Start the conversions
|
|
*/
|
|
reg = i2c_smbus_read_byte_data(client, ADM1025_REG_CONFIG);
|
|
if (!(reg & 0x01))
|
|
i2c_smbus_write_byte_data(client, ADM1025_REG_CONFIG,
|
|
(reg&0x7E)|0x01);
|
|
}
|
|
|
|
static int adm1025_detach_client(struct i2c_client *client)
|
|
{
|
|
struct adm1025_data *data = i2c_get_clientdata(client);
|
|
int err;
|
|
|
|
hwmon_device_unregister(data->class_dev);
|
|
sysfs_remove_group(&client->dev.kobj, &adm1025_group);
|
|
sysfs_remove_group(&client->dev.kobj, &adm1025_group_opt);
|
|
|
|
if ((err = i2c_detach_client(client)))
|
|
return err;
|
|
|
|
kfree(data);
|
|
return 0;
|
|
}
|
|
|
|
static struct adm1025_data *adm1025_update_device(struct device *dev)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct adm1025_data *data = i2c_get_clientdata(client);
|
|
|
|
mutex_lock(&data->update_lock);
|
|
|
|
if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) {
|
|
int i;
|
|
|
|
dev_dbg(&client->dev, "Updating data.\n");
|
|
for (i=0; i<6; i++) {
|
|
data->in[i] = i2c_smbus_read_byte_data(client,
|
|
ADM1025_REG_IN(i));
|
|
data->in_min[i] = i2c_smbus_read_byte_data(client,
|
|
ADM1025_REG_IN_MIN(i));
|
|
data->in_max[i] = i2c_smbus_read_byte_data(client,
|
|
ADM1025_REG_IN_MAX(i));
|
|
}
|
|
for (i=0; i<2; i++) {
|
|
data->temp[i] = i2c_smbus_read_byte_data(client,
|
|
ADM1025_REG_TEMP(i));
|
|
data->temp_min[i] = i2c_smbus_read_byte_data(client,
|
|
ADM1025_REG_TEMP_LOW(i));
|
|
data->temp_max[i] = i2c_smbus_read_byte_data(client,
|
|
ADM1025_REG_TEMP_HIGH(i));
|
|
}
|
|
data->alarms = i2c_smbus_read_byte_data(client,
|
|
ADM1025_REG_STATUS1)
|
|
| (i2c_smbus_read_byte_data(client,
|
|
ADM1025_REG_STATUS2) << 8);
|
|
data->vid = (i2c_smbus_read_byte_data(client,
|
|
ADM1025_REG_VID) & 0x0f)
|
|
| ((i2c_smbus_read_byte_data(client,
|
|
ADM1025_REG_VID4) & 0x01) << 4);
|
|
|
|
data->last_updated = jiffies;
|
|
data->valid = 1;
|
|
}
|
|
|
|
mutex_unlock(&data->update_lock);
|
|
|
|
return data;
|
|
}
|
|
|
|
static int __init sensors_adm1025_init(void)
|
|
{
|
|
return i2c_add_driver(&adm1025_driver);
|
|
}
|
|
|
|
static void __exit sensors_adm1025_exit(void)
|
|
{
|
|
i2c_del_driver(&adm1025_driver);
|
|
}
|
|
|
|
MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>");
|
|
MODULE_DESCRIPTION("ADM1025 driver");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_init(sensors_adm1025_init);
|
|
module_exit(sensors_adm1025_exit);
|