--- /dev/null
+/*
+ * smsc47m1.c - Part of lm_sensors, Linux kernel modules
+ * for hardware monitoring
+ *
+ * Supports the SMSC LPC47B27x, LPC47M10x, LPC47M112, LPC47M13x,
+ * LPC47M14x, LPC47M15x, LPC47M192, LPC47M292 and LPC47M997
+ * Super-I/O chips.
+ *
+ * Copyright (C) 2002 Mark D. Studebaker <mdsxyz123@yahoo.com>
+ * Copyright (C) 2004-2007 Jean Delvare <jdelvare@suse.de>
+ * Ported to Linux 2.6 by Gabriele Gorla <gorlik@yahoo.com>
+ * and Jean Delvare
+ *
+ * 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.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/ioport.h>
+#include <linux/jiffies.h>
+#include <linux/platform_device.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/mutex.h>
+#include <linux/sysfs.h>
+#include <linux/acpi.h>
+#include <linux/io.h>
+
+static unsigned short force_id;
+module_param(force_id, ushort, 0);
+MODULE_PARM_DESC(force_id, "Override the detected device ID");
+
+static struct platform_device *pdev;
+
+#define DRVNAME "smsc47m1"
+enum chips { smsc47m1, smsc47m2 };
+
+/* Super-I/0 registers and commands */
+
+#define REG 0x2e /* The register to read/write */
+#define VAL 0x2f /* The value to read/write */
+
+static inline void
+superio_outb(int reg, int val)
+{
+ outb(reg, REG);
+ outb(val, VAL);
+}
+
+static inline int
+superio_inb(int reg)
+{
+ outb(reg, REG);
+ return inb(VAL);
+}
+
+/* logical device for fans is 0x0A */
+#define superio_select() superio_outb(0x07, 0x0A)
+
+static inline void
+superio_enter(void)
+{
+ outb(0x55, REG);
+}
+
+static inline void
+superio_exit(void)
+{
+ outb(0xAA, REG);
+}
+
+#define SUPERIO_REG_ACT 0x30
+#define SUPERIO_REG_BASE 0x60
+#define SUPERIO_REG_DEVID 0x20
+#define SUPERIO_REG_DEVREV 0x21
+
+/* Logical device registers */
+
+#define SMSC_EXTENT 0x80
+
+/* nr is 0 or 1 in the macros below */
+#define SMSC47M1_REG_ALARM 0x04
+#define SMSC47M1_REG_TPIN(nr) (0x34 - (nr))
+#define SMSC47M1_REG_PPIN(nr) (0x36 - (nr))
+#define SMSC47M1_REG_FANDIV 0x58
+
+static const u8 SMSC47M1_REG_FAN[3] = { 0x59, 0x5a, 0x6b };
+static const u8 SMSC47M1_REG_FAN_PRELOAD[3] = { 0x5b, 0x5c, 0x6c };
+static const u8 SMSC47M1_REG_PWM[3] = { 0x56, 0x57, 0x69 };
+
+#define SMSC47M2_REG_ALARM6 0x09
+#define SMSC47M2_REG_TPIN1 0x38
+#define SMSC47M2_REG_TPIN2 0x37
+#define SMSC47M2_REG_TPIN3 0x2d
+#define SMSC47M2_REG_PPIN3 0x2c
+#define SMSC47M2_REG_FANDIV3 0x6a
+
+#define MIN_FROM_REG(reg, div) ((reg) >= 192 ? 0 : \
+ 983040 / ((192 - (reg)) * (div)))
+#define FAN_FROM_REG(reg, div, preload) ((reg) <= (preload) || (reg) == 255 ? \
+ 0 : \
+ 983040 / (((reg) - (preload)) * (div)))
+#define DIV_FROM_REG(reg) (1 << (reg))
+#define PWM_FROM_REG(reg) (((reg) & 0x7E) << 1)
+#define PWM_EN_FROM_REG(reg) ((~(reg)) & 0x01)
+#define PWM_TO_REG(reg) (((reg) >> 1) & 0x7E)
+
+struct smsc47m1_data {
+ unsigned short addr;
+ const char *name;
+ enum chips type;
+ struct device *hwmon_dev;
+
+ struct mutex update_lock;
+ unsigned long last_updated; /* In jiffies */
+
+ u8 fan[3]; /* Register value */
+ u8 fan_preload[3]; /* Register value */
+ u8 fan_div[3]; /* Register encoding, shifted right */
+ u8 alarms; /* Register encoding */
+ u8 pwm[3]; /* Register value (bit 0 is disable) */
+};
+
+struct smsc47m1_sio_data {
+ enum chips type;
+ u8 activate; /* Remember initial device state */
+};
+
+static inline int smsc47m1_read_value(struct smsc47m1_data *data, u8 reg)
+{
+ return inb_p(data->addr + reg);
+}
+
+static inline void smsc47m1_write_value(struct smsc47m1_data *data, u8 reg,
+ u8 value)
+{
+ outb_p(value, data->addr + reg);
+}
+
+static struct smsc47m1_data *smsc47m1_update_device(struct device *dev,
+ int init)
+{
+ struct smsc47m1_data *data = dev_get_drvdata(dev);
+
+ mutex_lock(&data->update_lock);
+
+ if (time_after(jiffies, data->last_updated + HZ + HZ / 2) || init) {
+ int i, fan_nr;
+ fan_nr = data->type == smsc47m2 ? 3 : 2;
+
+ for (i = 0; i < fan_nr; i++) {
+ data->fan[i] = smsc47m1_read_value(data,
+ SMSC47M1_REG_FAN[i]);
+ data->fan_preload[i] = smsc47m1_read_value(data,
+ SMSC47M1_REG_FAN_PRELOAD[i]);
+ data->pwm[i] = smsc47m1_read_value(data,
+ SMSC47M1_REG_PWM[i]);
+ }
+
+ i = smsc47m1_read_value(data, SMSC47M1_REG_FANDIV);
+ data->fan_div[0] = (i >> 4) & 0x03;
+ data->fan_div[1] = i >> 6;
+
+ data->alarms = smsc47m1_read_value(data,
+ SMSC47M1_REG_ALARM) >> 6;
+ /* Clear alarms if needed */
+ if (data->alarms)
+ smsc47m1_write_value(data, SMSC47M1_REG_ALARM, 0xC0);
+
+ if (fan_nr >= 3) {
+ data->fan_div[2] = (smsc47m1_read_value(data,
+ SMSC47M2_REG_FANDIV3) >> 4) & 0x03;
+ data->alarms |= (smsc47m1_read_value(data,
+ SMSC47M2_REG_ALARM6) & 0x40) >> 4;
+ /* Clear alarm if needed */
+ if (data->alarms & 0x04)
+ smsc47m1_write_value(data,
+ SMSC47M2_REG_ALARM6,
+ 0x40);
+ }
+
+ data->last_updated = jiffies;
+ }
+
+ mutex_unlock(&data->update_lock);
+ return data;
+}
+
+static ssize_t get_fan(struct device *dev, struct device_attribute
+ *devattr, char *buf)
+{
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+ struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
+ int nr = attr->index;
+ /*
+ * This chip (stupidly) stops monitoring fan speed if PWM is
+ * enabled and duty cycle is 0%. This is fine if the monitoring
+ * and control concern the same fan, but troublesome if they are
+ * not (which could as well happen).
+ */
+ int rpm = (data->pwm[nr] & 0x7F) == 0x00 ? 0 :
+ FAN_FROM_REG(data->fan[nr],
+ DIV_FROM_REG(data->fan_div[nr]),
+ data->fan_preload[nr]);
+ return sprintf(buf, "%d\n", rpm);
+}
+
+static ssize_t get_fan_min(struct device *dev, struct device_attribute
+ *devattr, char *buf)
+{
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+ struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
+ int nr = attr->index;
+ int rpm = MIN_FROM_REG(data->fan_preload[nr],
+ DIV_FROM_REG(data->fan_div[nr]));
+ return sprintf(buf, "%d\n", rpm);
+}
+
+static ssize_t get_fan_div(struct device *dev, struct device_attribute
+ *devattr, char *buf)
+{
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+ struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
+ return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[attr->index]));
+}
+
+static ssize_t get_fan_alarm(struct device *dev, struct device_attribute
+ *devattr, char *buf)
+{
+ int bitnr = to_sensor_dev_attr(devattr)->index;
+ struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
+ return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
+}
+
+static ssize_t get_pwm(struct device *dev, struct device_attribute
+ *devattr, char *buf)
+{
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+ struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
+ return sprintf(buf, "%d\n", PWM_FROM_REG(data->pwm[attr->index]));
+}
+
+static ssize_t get_pwm_en(struct device *dev, struct device_attribute
+ *devattr, char *buf)
+{
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+ struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
+ return sprintf(buf, "%d\n", PWM_EN_FROM_REG(data->pwm[attr->index]));
+}
+
+static ssize_t get_alarms(struct device *dev, struct device_attribute
+ *devattr, char *buf)
+{
+ struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
+ return sprintf(buf, "%d\n", data->alarms);
+}
+
+static ssize_t set_fan_min(struct device *dev, struct device_attribute
+ *devattr, const char *buf, size_t count)
+{
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+ struct smsc47m1_data *data = dev_get_drvdata(dev);
+ int nr = attr->index;
+ long rpmdiv;
+ long val;
+ int err;
+
+ err = kstrtol(buf, 10, &val);
+ if (err)
+ return err;
+
+ mutex_lock(&data->update_lock);
+ rpmdiv = val * DIV_FROM_REG(data->fan_div[nr]);
+
+ if (983040 > 192 * rpmdiv || 2 * rpmdiv > 983040) {
+ mutex_unlock(&data->update_lock);
+ return -EINVAL;
+ }
+
+ data->fan_preload[nr] = 192 - ((983040 + rpmdiv / 2) / rpmdiv);
+ smsc47m1_write_value(data, SMSC47M1_REG_FAN_PRELOAD[nr],
+ data->fan_preload[nr]);
+ mutex_unlock(&data->update_lock);
+
+ return count;
+}
+
+/*
+ * Note: we save and restore the fan minimum here, because its value is
+ * determined in part by the fan clock divider. This follows the principle
+ * of least surprise; the user doesn't expect the fan minimum to change just
+ * because the divider changed.
+ */
+static ssize_t set_fan_div(struct device *dev, struct device_attribute
+ *devattr, const char *buf, size_t count)
+{
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+ struct smsc47m1_data *data = dev_get_drvdata(dev);
+ int nr = attr->index;
+ long new_div;
+ int err;
+ long tmp;
+ u8 old_div = DIV_FROM_REG(data->fan_div[nr]);
+
+ err = kstrtol(buf, 10, &new_div);
+ if (err)
+ return err;
+
+ if (new_div == old_div) /* No change */
+ return count;
+
+ mutex_lock(&data->update_lock);
+ switch (new_div) {
+ case 1:
+ data->fan_div[nr] = 0;
+ break;
+ case 2:
+ data->fan_div[nr] = 1;
+ break;
+ case 4:
+ data->fan_div[nr] = 2;
+ break;
+ case 8:
+ data->fan_div[nr] = 3;
+ break;
+ default:
+ mutex_unlock(&data->update_lock);
+ return -EINVAL;
+ }
+
+ switch (nr) {
+ case 0:
+ case 1:
+ tmp = smsc47m1_read_value(data, SMSC47M1_REG_FANDIV)
+ & ~(0x03 << (4 + 2 * nr));
+ tmp |= data->fan_div[nr] << (4 + 2 * nr);
+ smsc47m1_write_value(data, SMSC47M1_REG_FANDIV, tmp);
+ break;
+ case 2:
+ tmp = smsc47m1_read_value(data, SMSC47M2_REG_FANDIV3) & 0xCF;
+ tmp |= data->fan_div[2] << 4;
+ smsc47m1_write_value(data, SMSC47M2_REG_FANDIV3, tmp);
+ break;
+ }
+
+ /* Preserve fan min */
+ tmp = 192 - (old_div * (192 - data->fan_preload[nr])
+ + new_div / 2) / new_div;
+ data->fan_preload[nr] = clamp_val(tmp, 0, 191);
+ smsc47m1_write_value(data, SMSC47M1_REG_FAN_PRELOAD[nr],
+ data->fan_preload[nr]);
+ mutex_unlock(&data->update_lock);
+
+ return count;
+}
+
+static ssize_t set_pwm(struct device *dev, struct device_attribute
+ *devattr, const char *buf, size_t count)
+{
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+ struct smsc47m1_data *data = dev_get_drvdata(dev);
+ int nr = attr->index;
+ long val;
+ int err;
+
+ err = kstrtol(buf, 10, &val);
+ if (err)
+ return err;
+
+ if (val < 0 || val > 255)
+ return -EINVAL;
+
+ mutex_lock(&data->update_lock);
+ data->pwm[nr] &= 0x81; /* Preserve additional bits */
+ data->pwm[nr] |= PWM_TO_REG(val);
+ smsc47m1_write_value(data, SMSC47M1_REG_PWM[nr],
+ data->pwm[nr]);
+ mutex_unlock(&data->update_lock);
+
+ return count;
+}
+
+static ssize_t set_pwm_en(struct device *dev, struct device_attribute
+ *devattr, const char *buf, size_t count)
+{
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+ struct smsc47m1_data *data = dev_get_drvdata(dev);
+ int nr = attr->index;
+ unsigned long val;
+ int err;
+
+ err = kstrtoul(buf, 10, &val);
+ if (err)
+ return err;
+
+ if (val > 1)
+ return -EINVAL;
+
+ mutex_lock(&data->update_lock);
+ data->pwm[nr] &= 0xFE; /* preserve the other bits */
+ data->pwm[nr] |= !val;
+ smsc47m1_write_value(data, SMSC47M1_REG_PWM[nr],
+ data->pwm[nr]);
+ mutex_unlock(&data->update_lock);
+
+ return count;
+}
+
+#define fan_present(offset) \
+static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO, get_fan, \
+ NULL, offset - 1); \
+static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
+ get_fan_min, set_fan_min, offset - 1); \
+static SENSOR_DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR, \
+ get_fan_div, set_fan_div, offset - 1); \
+static SENSOR_DEVICE_ATTR(fan##offset##_alarm, S_IRUGO, get_fan_alarm, \
+ NULL, offset - 1); \
+static SENSOR_DEVICE_ATTR(pwm##offset, S_IRUGO | S_IWUSR, \
+ get_pwm, set_pwm, offset - 1); \
+static SENSOR_DEVICE_ATTR(pwm##offset##_enable, S_IRUGO | S_IWUSR, \
+ get_pwm_en, set_pwm_en, offset - 1)
+
+fan_present(1);
+fan_present(2);
+fan_present(3);
+
+static DEVICE_ATTR(alarms, S_IRUGO, get_alarms, NULL);
+
+static ssize_t show_name(struct device *dev, struct device_attribute
+ *devattr, char *buf)
+{
+ struct smsc47m1_data *data = dev_get_drvdata(dev);
+
+ return sprintf(buf, "%s\n", data->name);
+}
+static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
+
+static struct attribute *smsc47m1_attributes_fan1[] = {
+ &sensor_dev_attr_fan1_input.dev_attr.attr,
+ &sensor_dev_attr_fan1_min.dev_attr.attr,
+ &sensor_dev_attr_fan1_div.dev_attr.attr,
+ &sensor_dev_attr_fan1_alarm.dev_attr.attr,
+ NULL
+};
+
+static const struct attribute_group smsc47m1_group_fan1 = {
+ .attrs = smsc47m1_attributes_fan1,
+};
+
+static struct attribute *smsc47m1_attributes_fan2[] = {
+ &sensor_dev_attr_fan2_input.dev_attr.attr,
+ &sensor_dev_attr_fan2_min.dev_attr.attr,
+ &sensor_dev_attr_fan2_div.dev_attr.attr,
+ &sensor_dev_attr_fan2_alarm.dev_attr.attr,
+ NULL
+};
+
+static const struct attribute_group smsc47m1_group_fan2 = {
+ .attrs = smsc47m1_attributes_fan2,
+};
+
+static struct attribute *smsc47m1_attributes_fan3[] = {
+ &sensor_dev_attr_fan3_input.dev_attr.attr,
+ &sensor_dev_attr_fan3_min.dev_attr.attr,
+ &sensor_dev_attr_fan3_div.dev_attr.attr,
+ &sensor_dev_attr_fan3_alarm.dev_attr.attr,
+ NULL
+};
+
+static const struct attribute_group smsc47m1_group_fan3 = {
+ .attrs = smsc47m1_attributes_fan3,
+};
+
+static struct attribute *smsc47m1_attributes_pwm1[] = {
+ &sensor_dev_attr_pwm1.dev_attr.attr,
+ &sensor_dev_attr_pwm1_enable.dev_attr.attr,
+ NULL
+};
+
+static const struct attribute_group smsc47m1_group_pwm1 = {
+ .attrs = smsc47m1_attributes_pwm1,
+};
+
+static struct attribute *smsc47m1_attributes_pwm2[] = {
+ &sensor_dev_attr_pwm2.dev_attr.attr,
+ &sensor_dev_attr_pwm2_enable.dev_attr.attr,
+ NULL
+};
+
+static const struct attribute_group smsc47m1_group_pwm2 = {
+ .attrs = smsc47m1_attributes_pwm2,
+};
+
+static struct attribute *smsc47m1_attributes_pwm3[] = {
+ &sensor_dev_attr_pwm3.dev_attr.attr,
+ &sensor_dev_attr_pwm3_enable.dev_attr.attr,
+ NULL
+};
+
+static const struct attribute_group smsc47m1_group_pwm3 = {
+ .attrs = smsc47m1_attributes_pwm3,
+};
+
+static struct attribute *smsc47m1_attributes[] = {
+ &dev_attr_alarms.attr,
+ &dev_attr_name.attr,
+ NULL
+};
+
+static const struct attribute_group smsc47m1_group = {
+ .attrs = smsc47m1_attributes,
+};
+
+static int __init smsc47m1_find(struct smsc47m1_sio_data *sio_data)
+{
+ u8 val;
+ unsigned short addr;
+
+ superio_enter();
+ val = force_id ? force_id : superio_inb(SUPERIO_REG_DEVID);
+
+ /*
+ * SMSC LPC47M10x/LPC47M112/LPC47M13x (device id 0x59), LPC47M14x
+ * (device id 0x5F) and LPC47B27x (device id 0x51) have fan control.
+ * The LPC47M15x and LPC47M192 chips "with hardware monitoring block"
+ * can do much more besides (device id 0x60).
+ * The LPC47M997 is undocumented, but seems to be compatible with
+ * the LPC47M192, and has the same device id.
+ * The LPC47M292 (device id 0x6B) is somewhat compatible, but it
+ * supports a 3rd fan, and the pin configuration registers are
+ * unfortunately different.
+ * The LPC47M233 has the same device id (0x6B) but is not compatible.
+ * We check the high bit of the device revision register to
+ * differentiate them.
+ */
+ switch (val) {
+ case 0x51:
+ pr_info("Found SMSC LPC47B27x\n");
+ sio_data->type = smsc47m1;
+ break;
+ case 0x59:
+ pr_info("Found SMSC LPC47M10x/LPC47M112/LPC47M13x\n");
+ sio_data->type = smsc47m1;
+ break;
+ case 0x5F:
+ pr_info("Found SMSC LPC47M14x\n");
+ sio_data->type = smsc47m1;
+ break;
+ case 0x60:
+ pr_info("Found SMSC LPC47M15x/LPC47M192/LPC47M997\n");
+ sio_data->type = smsc47m1;
+ break;
+ case 0x6B:
+ if (superio_inb(SUPERIO_REG_DEVREV) & 0x80) {
+ pr_debug("Found SMSC LPC47M233, unsupported\n");
+ superio_exit();
+ return -ENODEV;
+ }
+
+ pr_info("Found SMSC LPC47M292\n");
+ sio_data->type = smsc47m2;
+ break;
+ default:
+ superio_exit();
+ return -ENODEV;
+ }
+
+ superio_select();
+ addr = (superio_inb(SUPERIO_REG_BASE) << 8)
+ | superio_inb(SUPERIO_REG_BASE + 1);
+ if (addr == 0) {
+ pr_info("Device address not set, will not use\n");
+ superio_exit();
+ return -ENODEV;
+ }
+
+ /*
+ * Enable only if address is set (needed at least on the
+ * Compaq Presario S4000NX)
+ */
+ sio_data->activate = superio_inb(SUPERIO_REG_ACT);
+ if ((sio_data->activate & 0x01) == 0) {
+ pr_info("Enabling device\n");
+ superio_outb(SUPERIO_REG_ACT, sio_data->activate | 0x01);
+ }
+
+ superio_exit();
+ return addr;
+}
+
+/* Restore device to its initial state */
+static void smsc47m1_restore(const struct smsc47m1_sio_data *sio_data)
+{
+ if ((sio_data->activate & 0x01) == 0) {
+ superio_enter();
+ superio_select();
+
+ pr_info("Disabling device\n");
+ superio_outb(SUPERIO_REG_ACT, sio_data->activate);
+
+ superio_exit();
+ }
+}
+
+#define CHECK 1
+#define REQUEST 2
+
+/*
+ * This function can be used to:
+ * - test for resource conflicts with ACPI
+ * - request the resources
+ * We only allocate the I/O ports we really need, to minimize the risk of
+ * conflicts with ACPI or with other drivers.
+ */
+static int __init smsc47m1_handle_resources(unsigned short address,
+ enum chips type, int action,
+ struct device *dev)
+{
+ static const u8 ports_m1[] = {
+ /* register, region length */
+ 0x04, 1,
+ 0x33, 4,
+ 0x56, 7,
+ };
+
+ static const u8 ports_m2[] = {
+ /* register, region length */
+ 0x04, 1,
+ 0x09, 1,
+ 0x2c, 2,
+ 0x35, 4,
+ 0x56, 7,
+ 0x69, 4,
+ };
+
+ int i, ports_size, err;
+ const u8 *ports;
+
+ switch (type) {
+ case smsc47m1:
+ default:
+ ports = ports_m1;
+ ports_size = ARRAY_SIZE(ports_m1);
+ break;
+ case smsc47m2:
+ ports = ports_m2;
+ ports_size = ARRAY_SIZE(ports_m2);
+ break;
+ }
+
+ for (i = 0; i + 1 < ports_size; i += 2) {
+ unsigned short start = address + ports[i];
+ unsigned short len = ports[i + 1];
+
+ switch (action) {
+ case CHECK:
+ /* Only check for conflicts */
+ err = acpi_check_region(start, len, DRVNAME);
+ if (err)
+ return err;
+ break;
+ case REQUEST:
+ /* Request the resources */
+ if (!devm_request_region(dev, start, len, DRVNAME)) {
+ dev_err(dev,
+ "Region 0x%hx-0x%hx already in use!\n",
+ start, start + len);
+ return -EBUSY;
+ }
+ break;
+ }
+ }
+
+ return 0;
+}
+
+static void smsc47m1_remove_files(struct device *dev)
+{
+ sysfs_remove_group(&dev->kobj, &smsc47m1_group);
+ sysfs_remove_group(&dev->kobj, &smsc47m1_group_fan1);
+ sysfs_remove_group(&dev->kobj, &smsc47m1_group_fan2);
+ sysfs_remove_group(&dev->kobj, &smsc47m1_group_fan3);
+ sysfs_remove_group(&dev->kobj, &smsc47m1_group_pwm1);
+ sysfs_remove_group(&dev->kobj, &smsc47m1_group_pwm2);
+ sysfs_remove_group(&dev->kobj, &smsc47m1_group_pwm3);
+}
+
+static int __init smsc47m1_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct smsc47m1_sio_data *sio_data = dev_get_platdata(dev);
+ struct smsc47m1_data *data;
+ struct resource *res;
+ int err;
+ int fan1, fan2, fan3, pwm1, pwm2, pwm3;
+
+ static const char * const names[] = {
+ "smsc47m1",
+ "smsc47m2",
+ };
+
+ res = platform_get_resource(pdev, IORESOURCE_IO, 0);
+ err = smsc47m1_handle_resources(res->start, sio_data->type,
+ REQUEST, dev);
+ if (err < 0)
+ return err;
+
+ data = devm_kzalloc(dev, sizeof(struct smsc47m1_data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ data->addr = res->start;
+ data->type = sio_data->type;
+ data->name = names[sio_data->type];
+ mutex_init(&data->update_lock);
+ platform_set_drvdata(pdev, data);
+
+ /*
+ * If no function is properly configured, there's no point in
+ * actually registering the chip.
+ */
+ pwm1 = (smsc47m1_read_value(data, SMSC47M1_REG_PPIN(0)) & 0x05)
+ == 0x04;
+ pwm2 = (smsc47m1_read_value(data, SMSC47M1_REG_PPIN(1)) & 0x05)
+ == 0x04;
+ if (data->type == smsc47m2) {
+ fan1 = (smsc47m1_read_value(data, SMSC47M2_REG_TPIN1)
+ & 0x0d) == 0x09;
+ fan2 = (smsc47m1_read_value(data, SMSC47M2_REG_TPIN2)
+ & 0x0d) == 0x09;
+ fan3 = (smsc47m1_read_value(data, SMSC47M2_REG_TPIN3)
+ & 0x0d) == 0x0d;
+ pwm3 = (smsc47m1_read_value(data, SMSC47M2_REG_PPIN3)
+ & 0x0d) == 0x08;
+ } else {
+ fan1 = (smsc47m1_read_value(data, SMSC47M1_REG_TPIN(0))
+ & 0x05) == 0x05;
+ fan2 = (smsc47m1_read_value(data, SMSC47M1_REG_TPIN(1))
+ & 0x05) == 0x05;
+ fan3 = 0;
+ pwm3 = 0;
+ }
+ if (!(fan1 || fan2 || fan3 || pwm1 || pwm2 || pwm3)) {
+ dev_warn(dev, "Device not configured, will not use\n");
+ return -ENODEV;
+ }
+
+ /*
+ * Some values (fan min, clock dividers, pwm registers) may be
+ * needed before any update is triggered, so we better read them
+ * at least once here. We don't usually do it that way, but in
+ * this particular case, manually reading 5 registers out of 8
+ * doesn't make much sense and we're better using the existing
+ * function.
+ */
+ smsc47m1_update_device(dev, 1);
+
+ /* Register sysfs hooks */
+ if (fan1) {
+ err = sysfs_create_group(&dev->kobj,
+ &smsc47m1_group_fan1);
+ if (err)
+ goto error_remove_files;
+ } else
+ dev_dbg(dev, "Fan 1 not enabled by hardware, skipping\n");
+
+ if (fan2) {
+ err = sysfs_create_group(&dev->kobj,
+ &smsc47m1_group_fan2);
+ if (err)
+ goto error_remove_files;
+ } else
+ dev_dbg(dev, "Fan 2 not enabled by hardware, skipping\n");
+
+ if (fan3) {
+ err = sysfs_create_group(&dev->kobj,
+ &smsc47m1_group_fan3);
+ if (err)
+ goto error_remove_files;
+ } else if (data->type == smsc47m2)
+ dev_dbg(dev, "Fan 3 not enabled by hardware, skipping\n");
+
+ if (pwm1) {
+ err = sysfs_create_group(&dev->kobj,
+ &smsc47m1_group_pwm1);
+ if (err)
+ goto error_remove_files;
+ } else
+ dev_dbg(dev, "PWM 1 not enabled by hardware, skipping\n");
+
+ if (pwm2) {
+ err = sysfs_create_group(&dev->kobj,
+ &smsc47m1_group_pwm2);
+ if (err)
+ goto error_remove_files;
+ } else
+ dev_dbg(dev, "PWM 2 not enabled by hardware, skipping\n");
+
+ if (pwm3) {
+ err = sysfs_create_group(&dev->kobj,
+ &smsc47m1_group_pwm3);
+ if (err)
+ goto error_remove_files;
+ } else if (data->type == smsc47m2)
+ dev_dbg(dev, "PWM 3 not enabled by hardware, skipping\n");
+
+ err = sysfs_create_group(&dev->kobj, &smsc47m1_group);
+ if (err)
+ goto error_remove_files;
+
+ data->hwmon_dev = hwmon_device_register(dev);
+ if (IS_ERR(data->hwmon_dev)) {
+ err = PTR_ERR(data->hwmon_dev);
+ goto error_remove_files;
+ }
+
+ return 0;
+
+error_remove_files:
+ smsc47m1_remove_files(dev);
+ return err;
+}
+
+static int __exit smsc47m1_remove(struct platform_device *pdev)
+{
+ struct smsc47m1_data *data = platform_get_drvdata(pdev);
+
+ hwmon_device_unregister(data->hwmon_dev);
+ smsc47m1_remove_files(&pdev->dev);
+
+ return 0;
+}
+
+static struct platform_driver smsc47m1_driver = {
+ .driver = {
+ .name = DRVNAME,
+ },
+ .remove = __exit_p(smsc47m1_remove),
+};
+
+static int __init smsc47m1_device_add(unsigned short address,
+ const struct smsc47m1_sio_data *sio_data)
+{
+ struct resource res = {
+ .start = address,
+ .end = address + SMSC_EXTENT - 1,
+ .name = DRVNAME,
+ .flags = IORESOURCE_IO,
+ };
+ int err;
+
+ err = smsc47m1_handle_resources(address, sio_data->type, CHECK, NULL);
+ if (err)
+ goto exit;
+
+ pdev = platform_device_alloc(DRVNAME, address);
+ if (!pdev) {
+ err = -ENOMEM;
+ pr_err("Device allocation failed\n");
+ goto exit;
+ }
+
+ err = platform_device_add_resources(pdev, &res, 1);
+ if (err) {
+ pr_err("Device resource addition failed (%d)\n", err);
+ goto exit_device_put;
+ }
+
+ err = platform_device_add_data(pdev, sio_data,
+ sizeof(struct smsc47m1_sio_data));
+ if (err) {
+ pr_err("Platform data allocation failed\n");
+ goto exit_device_put;
+ }
+
+ err = platform_device_add(pdev);
+ if (err) {
+ pr_err("Device addition failed (%d)\n", err);
+ goto exit_device_put;
+ }
+
+ return 0;
+
+exit_device_put:
+ platform_device_put(pdev);
+exit:
+ return err;
+}
+
+static int __init sm_smsc47m1_init(void)
+{
+ int err;
+ unsigned short address;
+ struct smsc47m1_sio_data sio_data;
+
+ err = smsc47m1_find(&sio_data);
+ if (err < 0)
+ return err;
+ address = err;
+
+ /* Sets global pdev as a side effect */
+ err = smsc47m1_device_add(address, &sio_data);
+ if (err)
+ return err;
+
+ err = platform_driver_probe(&smsc47m1_driver, smsc47m1_probe);
+ if (err)
+ goto exit_device;
+
+ return 0;
+
+exit_device:
+ platform_device_unregister(pdev);
+ smsc47m1_restore(&sio_data);
+ return err;
+}
+
+static void __exit sm_smsc47m1_exit(void)
+{
+ platform_driver_unregister(&smsc47m1_driver);
+ smsc47m1_restore(dev_get_platdata(&pdev->dev));
+ platform_device_unregister(pdev);
+}
+
+MODULE_AUTHOR("Mark D. Studebaker <mdsxyz123@yahoo.com>");
+MODULE_DESCRIPTION("SMSC LPC47M1xx fan sensors driver");
+MODULE_LICENSE("GPL");
+
+module_init(sm_smsc47m1_init);
+module_exit(sm_smsc47m1_exit);
Code Review / kvmfornfv.git / blobdiff