// SPDX-License-Identifier: GPL-2.0-or-later /* * lm78.c - Part of lm_sensors, Linux kernel modules for hardware * monitoring * Copyright (c) 1998, 1999 Frodo Looijaard <[email protected]> * Copyright (c) 2007, 2011 Jean Delvare <[email protected]> */ #define pr_fmt(fmt) … #include <linux/module.h> #include <linux/init.h> #include <linux/slab.h> #include <linux/jiffies.h> #include <linux/i2c.h> #include <linux/hwmon.h> #include <linux/hwmon-vid.h> #include <linux/hwmon-sysfs.h> #include <linux/err.h> #include <linux/mutex.h> #ifdef CONFIG_ISA #include <linux/platform_device.h> #include <linux/ioport.h> #include <linux/io.h> #endif /* Addresses to scan */ static const unsigned short normal_i2c[] = …; enum chips { … }; /* Many LM78 constants specified below */ /* Length of ISA address segment */ #define LM78_EXTENT … /* Where are the ISA address/data registers relative to the base address */ #define LM78_ADDR_REG_OFFSET … #define LM78_DATA_REG_OFFSET … /* The LM78 registers */ #define LM78_REG_IN_MAX(nr) … #define LM78_REG_IN_MIN(nr) … #define LM78_REG_IN(nr) … #define LM78_REG_FAN_MIN(nr) … #define LM78_REG_FAN(nr) … #define LM78_REG_TEMP … #define LM78_REG_TEMP_OVER … #define LM78_REG_TEMP_HYST … #define LM78_REG_ALARM1 … #define LM78_REG_ALARM2 … #define LM78_REG_VID_FANDIV … #define LM78_REG_CONFIG … #define LM78_REG_CHIPID … #define LM78_REG_I2C_ADDR … /* * Conversions. Rounding and limit checking is only done on the TO_REG * variants. */ /* * IN: mV (0V to 4.08V) * REG: 16mV/bit */ static inline u8 IN_TO_REG(unsigned long val) { … } #define IN_FROM_REG(val) … static inline u8 FAN_TO_REG(long rpm, int div) { … } static inline int FAN_FROM_REG(u8 val, int div) { … } /* * TEMP: mC (-128C to +127C) * REG: 1C/bit, two's complement */ static inline s8 TEMP_TO_REG(long val) { … } static inline int TEMP_FROM_REG(s8 val) { … } #define DIV_FROM_REG(val) … struct lm78_data { … }; static int lm78_read_value(struct lm78_data *data, u8 reg); static int lm78_write_value(struct lm78_data *data, u8 reg, u8 value); static struct lm78_data *lm78_update_device(struct device *dev); static void lm78_init_device(struct lm78_data *data); /* 7 Voltages */ static ssize_t in_show(struct device *dev, struct device_attribute *da, char *buf) { … } static ssize_t in_min_show(struct device *dev, struct device_attribute *da, char *buf) { … } static ssize_t in_max_show(struct device *dev, struct device_attribute *da, char *buf) { … } static ssize_t in_min_store(struct device *dev, struct device_attribute *da, const char *buf, size_t count) { … } static ssize_t in_max_store(struct device *dev, struct device_attribute *da, const char *buf, size_t count) { … } static SENSOR_DEVICE_ATTR_RO(in0_input, in, 0); static SENSOR_DEVICE_ATTR_RW(in0_min, in_min, 0); static SENSOR_DEVICE_ATTR_RW(in0_max, in_max, 0); static SENSOR_DEVICE_ATTR_RO(in1_input, in, 1); static SENSOR_DEVICE_ATTR_RW(in1_min, in_min, 1); static SENSOR_DEVICE_ATTR_RW(in1_max, in_max, 1); static SENSOR_DEVICE_ATTR_RO(in2_input, in, 2); static SENSOR_DEVICE_ATTR_RW(in2_min, in_min, 2); static SENSOR_DEVICE_ATTR_RW(in2_max, in_max, 2); static SENSOR_DEVICE_ATTR_RO(in3_input, in, 3); static SENSOR_DEVICE_ATTR_RW(in3_min, in_min, 3); static SENSOR_DEVICE_ATTR_RW(in3_max, in_max, 3); static SENSOR_DEVICE_ATTR_RO(in4_input, in, 4); static SENSOR_DEVICE_ATTR_RW(in4_min, in_min, 4); static SENSOR_DEVICE_ATTR_RW(in4_max, in_max, 4); static SENSOR_DEVICE_ATTR_RO(in5_input, in, 5); static SENSOR_DEVICE_ATTR_RW(in5_min, in_min, 5); static SENSOR_DEVICE_ATTR_RW(in5_max, in_max, 5); static SENSOR_DEVICE_ATTR_RO(in6_input, in, 6); static SENSOR_DEVICE_ATTR_RW(in6_min, in_min, 6); static SENSOR_DEVICE_ATTR_RW(in6_max, in_max, 6); /* Temperature */ static ssize_t temp1_input_show(struct device *dev, struct device_attribute *da, char *buf) { … } static ssize_t temp1_max_show(struct device *dev, struct device_attribute *da, char *buf) { … } static ssize_t temp1_max_store(struct device *dev, struct device_attribute *da, const char *buf, size_t count) { … } static ssize_t temp1_max_hyst_show(struct device *dev, struct device_attribute *da, char *buf) { … } static ssize_t temp1_max_hyst_store(struct device *dev, struct device_attribute *da, const char *buf, size_t count) { … } static DEVICE_ATTR_RO(temp1_input); static DEVICE_ATTR_RW(temp1_max); static DEVICE_ATTR_RW(temp1_max_hyst); /* 3 Fans */ static ssize_t fan_show(struct device *dev, struct device_attribute *da, char *buf) { … } static ssize_t fan_min_show(struct device *dev, struct device_attribute *da, char *buf) { … } static ssize_t fan_min_store(struct device *dev, struct device_attribute *da, const char *buf, size_t count) { … } static ssize_t fan_div_show(struct device *dev, struct device_attribute *da, char *buf) { … } /* * Note: we save and restore the fan minimum here, because its value is * determined in part by the fan divisor. This follows the principle of * least surprise; the user doesn't expect the fan minimum to change just * because the divisor changed. */ static ssize_t fan_div_store(struct device *dev, struct device_attribute *da, const char *buf, size_t count) { … } static SENSOR_DEVICE_ATTR_RO(fan1_input, fan, 0); static SENSOR_DEVICE_ATTR_RW(fan1_min, fan_min, 0); static SENSOR_DEVICE_ATTR_RO(fan2_input, fan, 1); static SENSOR_DEVICE_ATTR_RW(fan2_min, fan_min, 1); static SENSOR_DEVICE_ATTR_RO(fan3_input, fan, 2); static SENSOR_DEVICE_ATTR_RW(fan3_min, fan_min, 2); /* Fan 3 divisor is locked in H/W */ static SENSOR_DEVICE_ATTR_RW(fan1_div, fan_div, 0); static SENSOR_DEVICE_ATTR_RW(fan2_div, fan_div, 1); static SENSOR_DEVICE_ATTR_RO(fan3_div, fan_div, 2); /* VID */ static ssize_t cpu0_vid_show(struct device *dev, struct device_attribute *da, char *buf) { … } static DEVICE_ATTR_RO(cpu0_vid); /* Alarms */ static ssize_t alarms_show(struct device *dev, struct device_attribute *da, char *buf) { … } static DEVICE_ATTR_RO(alarms); static ssize_t alarm_show(struct device *dev, struct device_attribute *da, char *buf) { … } static SENSOR_DEVICE_ATTR_RO(in0_alarm, alarm, 0); static SENSOR_DEVICE_ATTR_RO(in1_alarm, alarm, 1); static SENSOR_DEVICE_ATTR_RO(in2_alarm, alarm, 2); static SENSOR_DEVICE_ATTR_RO(in3_alarm, alarm, 3); static SENSOR_DEVICE_ATTR_RO(in4_alarm, alarm, 8); static SENSOR_DEVICE_ATTR_RO(in5_alarm, alarm, 9); static SENSOR_DEVICE_ATTR_RO(in6_alarm, alarm, 10); static SENSOR_DEVICE_ATTR_RO(fan1_alarm, alarm, 6); static SENSOR_DEVICE_ATTR_RO(fan2_alarm, alarm, 7); static SENSOR_DEVICE_ATTR_RO(fan3_alarm, alarm, 11); static SENSOR_DEVICE_ATTR_RO(temp1_alarm, alarm, 4); static struct attribute *lm78_attrs[] = …; ATTRIBUTE_GROUPS(…); /* * ISA related code */ #ifdef CONFIG_ISA /* ISA device, if found */ static struct platform_device *pdev; static unsigned short isa_address = 0x290; static struct lm78_data *lm78_data_if_isa(void) { return pdev ? platform_get_drvdata(pdev) : NULL; } /* Returns 1 if the I2C chip appears to be an alias of the ISA chip */ static int lm78_alias_detect(struct i2c_client *client, u8 chipid) { struct lm78_data *isa; int i; if (!pdev) /* No ISA chip */ return 0; isa = platform_get_drvdata(pdev); if (lm78_read_value(isa, LM78_REG_I2C_ADDR) != client->addr) return 0; /* Address doesn't match */ if ((lm78_read_value(isa, LM78_REG_CHIPID) & 0xfe) != (chipid & 0xfe)) return 0; /* Chip type doesn't match */ /* * We compare all the limit registers, the config register and the * interrupt mask registers */ for (i = 0x2b; i <= 0x3d; i++) { if (lm78_read_value(isa, i) != i2c_smbus_read_byte_data(client, i)) return 0; } if (lm78_read_value(isa, LM78_REG_CONFIG) != i2c_smbus_read_byte_data(client, LM78_REG_CONFIG)) return 0; for (i = 0x43; i <= 0x46; i++) { if (lm78_read_value(isa, i) != i2c_smbus_read_byte_data(client, i)) return 0; } return 1; } #else /* !CONFIG_ISA */ static int lm78_alias_detect(struct i2c_client *client, u8 chipid) { … } static struct lm78_data *lm78_data_if_isa(void) { … } #endif /* CONFIG_ISA */ static int lm78_i2c_detect(struct i2c_client *client, struct i2c_board_info *info) { … } static int lm78_i2c_probe(struct i2c_client *client) { … } static const struct i2c_device_id lm78_i2c_id[] = …; MODULE_DEVICE_TABLE(i2c, lm78_i2c_id); static struct i2c_driver lm78_driver = …; /* * The SMBus locks itself, but ISA access must be locked explicitly! * We don't want to lock the whole ISA bus, so we lock each client * separately. * We ignore the LM78 BUSY flag at this moment - it could lead to deadlocks, * would slow down the LM78 access and should not be necessary. */ static int lm78_read_value(struct lm78_data *data, u8 reg) { … } static int lm78_write_value(struct lm78_data *data, u8 reg, u8 value) { … } static void lm78_init_device(struct lm78_data *data) { … } static struct lm78_data *lm78_update_device(struct device *dev) { … } #ifdef CONFIG_ISA static int lm78_isa_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct device *hwmon_dev; struct lm78_data *data; struct resource *res; /* Reserve the ISA region */ res = platform_get_resource(pdev, IORESOURCE_IO, 0); if (!devm_request_region(dev, res->start + LM78_ADDR_REG_OFFSET, 2, "lm78")) return -EBUSY; data = devm_kzalloc(dev, sizeof(struct lm78_data), GFP_KERNEL); if (!data) return -ENOMEM; mutex_init(&data->lock); data->isa_addr = res->start; platform_set_drvdata(pdev, data); if (lm78_read_value(data, LM78_REG_CHIPID) & 0x80) { data->type = lm79; data->name = "lm79"; } else { data->type = lm78; data->name = "lm78"; } /* Initialize the LM78 chip */ lm78_init_device(data); hwmon_dev = devm_hwmon_device_register_with_groups(dev, data->name, data, lm78_groups); return PTR_ERR_OR_ZERO(hwmon_dev); } static struct platform_driver lm78_isa_driver = { .driver = { .name = "lm78", }, .probe = lm78_isa_probe, }; /* return 1 if a supported chip is found, 0 otherwise */ static int __init lm78_isa_found(unsigned short address) { int val, save, found = 0; int port; /* * Some boards declare base+0 to base+7 as a PNP device, some base+4 * to base+7 and some base+5 to base+6. So we better request each port * individually for the probing phase. */ for (port = address; port < address + LM78_EXTENT; port++) { if (!request_region(port, 1, "lm78")) { pr_debug("Failed to request port 0x%x\n", port); goto release; } } #define REALLY_SLOW_IO /* * We need the timeouts for at least some LM78-like * chips. But only if we read 'undefined' registers. */ val = inb_p(address + 1); if (inb_p(address + 2) != val || inb_p(address + 3) != val || inb_p(address + 7) != val) goto release; #undef REALLY_SLOW_IO /* * We should be able to change the 7 LSB of the address port. The * MSB (busy flag) should be clear initially, set after the write. */ save = inb_p(address + LM78_ADDR_REG_OFFSET); if (save & 0x80) goto release; val = ~save & 0x7f; outb_p(val, address + LM78_ADDR_REG_OFFSET); if (inb_p(address + LM78_ADDR_REG_OFFSET) != (val | 0x80)) { outb_p(save, address + LM78_ADDR_REG_OFFSET); goto release; } /* We found a device, now see if it could be an LM78 */ outb_p(LM78_REG_CONFIG, address + LM78_ADDR_REG_OFFSET); val = inb_p(address + LM78_DATA_REG_OFFSET); if (val & 0x80) goto release; outb_p(LM78_REG_I2C_ADDR, address + LM78_ADDR_REG_OFFSET); val = inb_p(address + LM78_DATA_REG_OFFSET); if (val < 0x03 || val > 0x77) /* Not a valid I2C address */ goto release; /* The busy flag should be clear again */ if (inb_p(address + LM78_ADDR_REG_OFFSET) & 0x80) goto release; /* Explicitly prevent the misdetection of Winbond chips */ outb_p(0x4f, address + LM78_ADDR_REG_OFFSET); val = inb_p(address + LM78_DATA_REG_OFFSET); if (val == 0xa3 || val == 0x5c) goto release; /* Explicitly prevent the misdetection of ITE chips */ outb_p(0x58, address + LM78_ADDR_REG_OFFSET); val = inb_p(address + LM78_DATA_REG_OFFSET); if (val == 0x90) goto release; /* Determine the chip type */ outb_p(LM78_REG_CHIPID, address + LM78_ADDR_REG_OFFSET); val = inb_p(address + LM78_DATA_REG_OFFSET); if (val == 0x00 || val == 0x20 /* LM78 */ || val == 0x40 /* LM78-J */ || (val & 0xfe) == 0xc0) /* LM79 */ found = 1; if (found) pr_info("Found an %s chip at %#x\n", val & 0x80 ? "LM79" : "LM78", (int)address); release: for (port--; port >= address; port--) release_region(port, 1); return found; } static int __init lm78_isa_device_add(unsigned short address) { struct resource res = { .start = address, .end = address + LM78_EXTENT - 1, .name = "lm78", .flags = IORESOURCE_IO, }; int err; pdev = platform_device_alloc("lm78", 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(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: pdev = NULL; return err; } static int __init lm78_isa_register(void) { int res; if (lm78_isa_found(isa_address)) { res = platform_driver_register(&lm78_isa_driver); if (res) goto exit; /* Sets global pdev as a side effect */ res = lm78_isa_device_add(isa_address); if (res) goto exit_unreg_isa_driver; } return 0; exit_unreg_isa_driver: platform_driver_unregister(&lm78_isa_driver); exit: return res; } static void lm78_isa_unregister(void) { if (pdev) { platform_device_unregister(pdev); platform_driver_unregister(&lm78_isa_driver); } } #else /* !CONFIG_ISA */ static int __init lm78_isa_register(void) { … } static void lm78_isa_unregister(void) { … } #endif /* CONFIG_ISA */ static int __init sm_lm78_init(void) { … } static void __exit sm_lm78_exit(void) { … } MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …; module_init(…) …; module_exit(sm_lm78_exit);
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