diff options
Diffstat (limited to 'drivers/hwmon/smsc47m1.c')
| -rw-r--r-- | drivers/hwmon/smsc47m1.c | 949 |
1 files changed, 949 insertions, 0 deletions
diff --git a/drivers/hwmon/smsc47m1.c b/drivers/hwmon/smsc47m1.c new file mode 100644 index 000000000..37531b5c8 --- /dev/null +++ b/drivers/hwmon/smsc47m1.c @@ -0,0 +1,949 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * 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 + */ + +#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 int +superio_enter(void) +{ + if (!request_muxed_region(REG, 2, DRVNAME)) + return -EBUSY; + + outb(0x55, REG); + return 0; +} + +static inline void +superio_exit(void) +{ + outb(0xAA, REG); + release_region(REG, 2); +} + +#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 fan_show(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 fan_min_show(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 fan_div_show(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 fan_alarm_show(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 pwm_show(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 pwm_en_show(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 alarms_show(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 fan_min_store(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 fan_div_store(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; + default: + BUG(); + } + + /* 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 pwm_store(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 pwm_en_store(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; +} + +static SENSOR_DEVICE_ATTR_RO(fan1_input, fan, 0); +static SENSOR_DEVICE_ATTR_RW(fan1_min, fan_min, 0); +static SENSOR_DEVICE_ATTR_RW(fan1_div, fan_div, 0); +static SENSOR_DEVICE_ATTR_RO(fan1_alarm, fan_alarm, 0); +static SENSOR_DEVICE_ATTR_RW(pwm1, pwm, 0); +static SENSOR_DEVICE_ATTR_RW(pwm1_enable, pwm_en, 0); +static SENSOR_DEVICE_ATTR_RO(fan2_input, fan, 1); +static SENSOR_DEVICE_ATTR_RW(fan2_min, fan_min, 1); +static SENSOR_DEVICE_ATTR_RW(fan2_div, fan_div, 1); +static SENSOR_DEVICE_ATTR_RO(fan2_alarm, fan_alarm, 1); +static SENSOR_DEVICE_ATTR_RW(pwm2, pwm, 1); +static SENSOR_DEVICE_ATTR_RW(pwm2_enable, pwm_en, 1); +static SENSOR_DEVICE_ATTR_RO(fan3_input, fan, 2); +static SENSOR_DEVICE_ATTR_RW(fan3_min, fan_min, 2); +static SENSOR_DEVICE_ATTR_RW(fan3_div, fan_div, 2); +static SENSOR_DEVICE_ATTR_RO(fan3_alarm, fan_alarm, 2); +static SENSOR_DEVICE_ATTR_RW(pwm3, pwm, 2); +static SENSOR_DEVICE_ATTR_RW(pwm3_enable, pwm_en, 2); + +static DEVICE_ATTR_RO(alarms); + +static ssize_t name_show(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_RO(name); + +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; + int err; + + err = superio_enter(); + if (err) + return err; + + 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) { + if (!superio_enter()) { + superio_select(); + pr_info("Disabling device\n"); + superio_outb(SUPERIO_REG_ACT, sio_data->activate); + superio_exit(); + } else { + pr_warn("Failed to disable device\n"); + } + } +} + +#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%x-0x%x 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); |