| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Guenter Roeck | 2324 | 90.99% | 19 | 59.38% |
| Jean Delvare | 91 | 3.56% | 5 | 15.62% |
| Clemens Ladisch | 58 | 2.27% | 1 | 3.12% |
| Peter Rosin | 58 | 2.27% | 1 | 3.12% |
| Alison Schofield | 18 | 0.70% | 2 | 6.25% |
| Thomas Gleixner | 2 | 0.08% | 1 | 3.12% |
| Axel Lin | 1 | 0.04% | 1 | 3.12% |
| Al Viro | 1 | 0.04% | 1 | 3.12% |
| Fengguang Wu | 1 | 0.04% | 1 | 3.12% |
| Total | 2554 | 32 |
// SPDX-License-Identifier: GPL-2.0-or-later /* * jc42.c - driver for Jedec JC42.4 compliant temperature sensors * * Copyright (c) 2010 Ericsson AB. * * Derived from lm77.c by Andras BALI <drewie@freemail.hu>. * * JC42.4 compliant temperature sensors are typically used on memory modules. */ #include <linux/bitops.h> #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/err.h> #include <linux/mutex.h> #include <linux/of.h> /* Addresses to scan */ static const unsigned short normal_i2c[] = { 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, I2C_CLIENT_END }; /* JC42 registers. All registers are 16 bit. */ #define JC42_REG_CAP 0x00 #define JC42_REG_CONFIG 0x01 #define JC42_REG_TEMP_UPPER 0x02 #define JC42_REG_TEMP_LOWER 0x03 #define JC42_REG_TEMP_CRITICAL 0x04 #define JC42_REG_TEMP 0x05 #define JC42_REG_MANID 0x06 #define JC42_REG_DEVICEID 0x07 #define JC42_REG_SMBUS 0x22 /* NXP and Atmel, possibly others? */ /* Status bits in temperature register */ #define JC42_ALARM_CRIT_BIT 15 #define JC42_ALARM_MAX_BIT 14 #define JC42_ALARM_MIN_BIT 13 /* Configuration register defines */ #define JC42_CFG_CRIT_ONLY (1 << 2) #define JC42_CFG_TCRIT_LOCK (1 << 6) #define JC42_CFG_EVENT_LOCK (1 << 7) #define JC42_CFG_SHUTDOWN (1 << 8) #define JC42_CFG_HYST_SHIFT 9 #define JC42_CFG_HYST_MASK (0x03 << 9) /* Capabilities */ #define JC42_CAP_RANGE (1 << 2) /* Manufacturer IDs */ #define ADT_MANID 0x11d4 /* Analog Devices */ #define ATMEL_MANID 0x001f /* Atmel */ #define ATMEL_MANID2 0x1114 /* Atmel */ #define MAX_MANID 0x004d /* Maxim */ #define IDT_MANID 0x00b3 /* IDT */ #define MCP_MANID 0x0054 /* Microchip */ #define NXP_MANID 0x1131 /* NXP Semiconductors */ #define ONS_MANID 0x1b09 /* ON Semiconductor */ #define STM_MANID 0x104a /* ST Microelectronics */ #define GT_MANID 0x1c68 /* Giantec */ #define GT_MANID2 0x132d /* Giantec, 2nd mfg ID */ /* SMBUS register */ #define SMBUS_STMOUT BIT(7) /* SMBus time-out, active low */ /* Supported chips */ /* Analog Devices */ #define ADT7408_DEVID 0x0801 #define ADT7408_DEVID_MASK 0xffff /* Atmel */ #define AT30TS00_DEVID 0x8201 #define AT30TS00_DEVID_MASK 0xffff #define AT30TSE004_DEVID 0x2200 #define AT30TSE004_DEVID_MASK 0xffff /* Giantec */ #define GT30TS00_DEVID 0x2200 #define GT30TS00_DEVID_MASK 0xff00 #define GT34TS02_DEVID 0x3300 #define GT34TS02_DEVID_MASK 0xff00 /* IDT */ #define TSE2004_DEVID 0x2200 #define TSE2004_DEVID_MASK 0xff00 #define TS3000_DEVID 0x2900 /* Also matches TSE2002 */ #define TS3000_DEVID_MASK 0xff00 #define TS3001_DEVID 0x3000 #define TS3001_DEVID_MASK 0xff00 /* Maxim */ #define MAX6604_DEVID 0x3e00 #define MAX6604_DEVID_MASK 0xffff /* Microchip */ #define MCP9804_DEVID 0x0200 #define MCP9804_DEVID_MASK 0xfffc #define MCP9808_DEVID 0x0400 #define MCP9808_DEVID_MASK 0xfffc #define MCP98242_DEVID 0x2000 #define MCP98242_DEVID_MASK 0xfffc #define MCP98243_DEVID 0x2100 #define MCP98243_DEVID_MASK 0xfffc #define MCP98244_DEVID 0x2200 #define MCP98244_DEVID_MASK 0xfffc #define MCP9843_DEVID 0x0000 /* Also matches mcp9805 */ #define MCP9843_DEVID_MASK 0xfffe /* NXP */ #define SE97_DEVID 0xa200 #define SE97_DEVID_MASK 0xfffc #define SE98_DEVID 0xa100 #define SE98_DEVID_MASK 0xfffc /* ON Semiconductor */ #define CAT6095_DEVID 0x0800 /* Also matches CAT34TS02 */ #define CAT6095_DEVID_MASK 0xffe0 #define CAT34TS02C_DEVID 0x0a00 #define CAT34TS02C_DEVID_MASK 0xfff0 #define CAT34TS04_DEVID 0x2200 #define CAT34TS04_DEVID_MASK 0xfff0 /* ST Microelectronics */ #define STTS424_DEVID 0x0101 #define STTS424_DEVID_MASK 0xffff #define STTS424E_DEVID 0x0000 #define STTS424E_DEVID_MASK 0xfffe #define STTS2002_DEVID 0x0300 #define STTS2002_DEVID_MASK 0xffff #define STTS2004_DEVID 0x2201 #define STTS2004_DEVID_MASK 0xffff #define STTS3000_DEVID 0x0200 #define STTS3000_DEVID_MASK 0xffff static u16 jc42_hysteresis[] = { 0, 1500, 3000, 6000 }; struct jc42_chips { u16 manid; u16 devid; u16 devid_mask; }; static struct jc42_chips jc42_chips[] = { { ADT_MANID, ADT7408_DEVID, ADT7408_DEVID_MASK }, { ATMEL_MANID, AT30TS00_DEVID, AT30TS00_DEVID_MASK }, { ATMEL_MANID2, AT30TSE004_DEVID, AT30TSE004_DEVID_MASK }, { GT_MANID, GT30TS00_DEVID, GT30TS00_DEVID_MASK }, { GT_MANID2, GT34TS02_DEVID, GT34TS02_DEVID_MASK }, { IDT_MANID, TSE2004_DEVID, TSE2004_DEVID_MASK }, { IDT_MANID, TS3000_DEVID, TS3000_DEVID_MASK }, { IDT_MANID, TS3001_DEVID, TS3001_DEVID_MASK }, { MAX_MANID, MAX6604_DEVID, MAX6604_DEVID_MASK }, { MCP_MANID, MCP9804_DEVID, MCP9804_DEVID_MASK }, { MCP_MANID, MCP9808_DEVID, MCP9808_DEVID_MASK }, { MCP_MANID, MCP98242_DEVID, MCP98242_DEVID_MASK }, { MCP_MANID, MCP98243_DEVID, MCP98243_DEVID_MASK }, { MCP_MANID, MCP98244_DEVID, MCP98244_DEVID_MASK }, { MCP_MANID, MCP9843_DEVID, MCP9843_DEVID_MASK }, { NXP_MANID, SE97_DEVID, SE97_DEVID_MASK }, { ONS_MANID, CAT6095_DEVID, CAT6095_DEVID_MASK }, { ONS_MANID, CAT34TS02C_DEVID, CAT34TS02C_DEVID_MASK }, { ONS_MANID, CAT34TS04_DEVID, CAT34TS04_DEVID_MASK }, { NXP_MANID, SE98_DEVID, SE98_DEVID_MASK }, { STM_MANID, STTS424_DEVID, STTS424_DEVID_MASK }, { STM_MANID, STTS424E_DEVID, STTS424E_DEVID_MASK }, { STM_MANID, STTS2002_DEVID, STTS2002_DEVID_MASK }, { STM_MANID, STTS2004_DEVID, STTS2004_DEVID_MASK }, { STM_MANID, STTS3000_DEVID, STTS3000_DEVID_MASK }, }; enum temp_index { t_input = 0, t_crit, t_min, t_max, t_num_temp }; static const u8 temp_regs[t_num_temp] = { [t_input] = JC42_REG_TEMP, [t_crit] = JC42_REG_TEMP_CRITICAL, [t_min] = JC42_REG_TEMP_LOWER, [t_max] = JC42_REG_TEMP_UPPER, }; /* Each client has this additional data */ struct jc42_data { struct i2c_client *client; struct mutex update_lock; /* protect register access */ bool extended; /* true if extended range supported */ bool valid; unsigned long last_updated; /* In jiffies */ u16 orig_config; /* original configuration */ u16 config; /* current configuration */ u16 temp[t_num_temp];/* Temperatures */ }; #define JC42_TEMP_MIN_EXTENDED (-40000) #define JC42_TEMP_MIN 0 #define JC42_TEMP_MAX 125000 static u16 jc42_temp_to_reg(long temp, bool extended) { int ntemp = clamp_val(temp, extended ? JC42_TEMP_MIN_EXTENDED : JC42_TEMP_MIN, JC42_TEMP_MAX); /* convert from 0.001 to 0.0625 resolution */ return (ntemp * 2 / 125) & 0x1fff; } static int jc42_temp_from_reg(s16 reg) { reg = sign_extend32(reg, 12); /* convert from 0.0625 to 0.001 resolution */ return reg * 125 / 2; } static struct jc42_data *jc42_update_device(struct device *dev) { struct jc42_data *data = dev_get_drvdata(dev); struct i2c_client *client = data->client; struct jc42_data *ret = data; int i, val; mutex_lock(&data->update_lock); if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { for (i = 0; i < t_num_temp; i++) { val = i2c_smbus_read_word_swapped(client, temp_regs[i]); if (val < 0) { ret = ERR_PTR(val); goto abort; } data->temp[i] = val; } data->last_updated = jiffies; data->valid = true; } abort: mutex_unlock(&data->update_lock); return ret; } static int jc42_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, long *val) { struct jc42_data *data = jc42_update_device(dev); int temp, hyst; if (IS_ERR(data)) return PTR_ERR(data); switch (attr) { case hwmon_temp_input: *val = jc42_temp_from_reg(data->temp[t_input]); return 0; case hwmon_temp_min: *val = jc42_temp_from_reg(data->temp[t_min]); return 0; case hwmon_temp_max: *val = jc42_temp_from_reg(data->temp[t_max]); return 0; case hwmon_temp_crit: *val = jc42_temp_from_reg(data->temp[t_crit]); return 0; case hwmon_temp_max_hyst: temp = jc42_temp_from_reg(data->temp[t_max]); hyst = jc42_hysteresis[(data->config & JC42_CFG_HYST_MASK) >> JC42_CFG_HYST_SHIFT]; *val = temp - hyst; return 0; case hwmon_temp_crit_hyst: temp = jc42_temp_from_reg(data->temp[t_crit]); hyst = jc42_hysteresis[(data->config & JC42_CFG_HYST_MASK) >> JC42_CFG_HYST_SHIFT]; *val = temp - hyst; return 0; case hwmon_temp_min_alarm: *val = (data->temp[t_input] >> JC42_ALARM_MIN_BIT) & 1; return 0; case hwmon_temp_max_alarm: *val = (data->temp[t_input] >> JC42_ALARM_MAX_BIT) & 1; return 0; case hwmon_temp_crit_alarm: *val = (data->temp[t_input] >> JC42_ALARM_CRIT_BIT) & 1; return 0; default: return -EOPNOTSUPP; } } static int jc42_write(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, long val) { struct jc42_data *data = dev_get_drvdata(dev); struct i2c_client *client = data->client; int diff, hyst; int ret; mutex_lock(&data->update_lock); switch (attr) { case hwmon_temp_min: data->temp[t_min] = jc42_temp_to_reg(val, data->extended); ret = i2c_smbus_write_word_swapped(client, temp_regs[t_min], data->temp[t_min]); break; case hwmon_temp_max: data->temp[t_max] = jc42_temp_to_reg(val, data->extended); ret = i2c_smbus_write_word_swapped(client, temp_regs[t_max], data->temp[t_max]); break; case hwmon_temp_crit: data->temp[t_crit] = jc42_temp_to_reg(val, data->extended); ret = i2c_smbus_write_word_swapped(client, temp_regs[t_crit], data->temp[t_crit]); break; case hwmon_temp_crit_hyst: /* * JC42.4 compliant chips only support four hysteresis values. * Pick best choice and go from there. */ val = clamp_val(val, (data->extended ? JC42_TEMP_MIN_EXTENDED : JC42_TEMP_MIN) - 6000, JC42_TEMP_MAX); diff = jc42_temp_from_reg(data->temp[t_crit]) - val; hyst = 0; if (diff > 0) { if (diff < 2250) hyst = 1; /* 1.5 degrees C */ else if (diff < 4500) hyst = 2; /* 3.0 degrees C */ else hyst = 3; /* 6.0 degrees C */ } data->config = (data->config & ~JC42_CFG_HYST_MASK) | (hyst << JC42_CFG_HYST_SHIFT); ret = i2c_smbus_write_word_swapped(data->client, JC42_REG_CONFIG, data->config); break; default: ret = -EOPNOTSUPP; break; } mutex_unlock(&data->update_lock); return ret; } static umode_t jc42_is_visible(const void *_data, enum hwmon_sensor_types type, u32 attr, int channel) { const struct jc42_data *data = _data; unsigned int config = data->config; umode_t mode = 0444; switch (attr) { case hwmon_temp_min: case hwmon_temp_max: if (!(config & JC42_CFG_EVENT_LOCK)) mode |= 0200; break; case hwmon_temp_crit: if (!(config & JC42_CFG_TCRIT_LOCK)) mode |= 0200; break; case hwmon_temp_crit_hyst: if (!(config & (JC42_CFG_EVENT_LOCK | JC42_CFG_TCRIT_LOCK))) mode |= 0200; break; case hwmon_temp_input: case hwmon_temp_max_hyst: case hwmon_temp_min_alarm: case hwmon_temp_max_alarm: case hwmon_temp_crit_alarm: break; default: mode = 0; break; } return mode; } /* Return 0 if detection is successful, -ENODEV otherwise */ static int jc42_detect(struct i2c_client *client, struct i2c_board_info *info) { struct i2c_adapter *adapter = client->adapter; int i, config, cap, manid, devid; if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA)) return -ENODEV; cap = i2c_smbus_read_word_swapped(client, JC42_REG_CAP); config = i2c_smbus_read_word_swapped(client, JC42_REG_CONFIG); manid = i2c_smbus_read_word_swapped(client, JC42_REG_MANID); devid = i2c_smbus_read_word_swapped(client, JC42_REG_DEVICEID); if (cap < 0 || config < 0 || manid < 0 || devid < 0) return -ENODEV; if ((cap & 0xff00) || (config & 0xf800)) return -ENODEV; for (i = 0; i < ARRAY_SIZE(jc42_chips); i++) { struct jc42_chips *chip = &jc42_chips[i]; if (manid == chip->manid && (devid & chip->devid_mask) == chip->devid) { strlcpy(info->type, "jc42", I2C_NAME_SIZE); return 0; } } return -ENODEV; } static const struct hwmon_channel_info *jc42_info[] = { HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX | HWMON_T_CRIT | HWMON_T_MAX_HYST | HWMON_T_CRIT_HYST | HWMON_T_MIN_ALARM | HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM), NULL }; static const struct hwmon_ops jc42_hwmon_ops = { .is_visible = jc42_is_visible, .read = jc42_read, .write = jc42_write, }; static const struct hwmon_chip_info jc42_chip_info = { .ops = &jc42_hwmon_ops, .info = jc42_info, }; static int jc42_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct device *dev = &client->dev; struct device *hwmon_dev; struct jc42_data *data; int config, cap; data = devm_kzalloc(dev, sizeof(struct jc42_data), GFP_KERNEL); if (!data) return -ENOMEM; data->client = client; i2c_set_clientdata(client, data); mutex_init(&data->update_lock); cap = i2c_smbus_read_word_swapped(client, JC42_REG_CAP); if (cap < 0) return cap; data->extended = !!(cap & JC42_CAP_RANGE); if (device_property_read_bool(dev, "smbus-timeout-disable")) { int smbus; /* * Not all chips support this register, but from a * quick read of various datasheets no chip appears * incompatible with the below attempt to disable * the timeout. And the whole thing is opt-in... */ smbus = i2c_smbus_read_word_swapped(client, JC42_REG_SMBUS); if (smbus < 0) return smbus; i2c_smbus_write_word_swapped(client, JC42_REG_SMBUS, smbus | SMBUS_STMOUT); } config = i2c_smbus_read_word_swapped(client, JC42_REG_CONFIG); if (config < 0) return config; data->orig_config = config; if (config & JC42_CFG_SHUTDOWN) { config &= ~JC42_CFG_SHUTDOWN; i2c_smbus_write_word_swapped(client, JC42_REG_CONFIG, config); } data->config = config; hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, data, &jc42_chip_info, NULL); return PTR_ERR_OR_ZERO(hwmon_dev); } static int jc42_remove(struct i2c_client *client) { struct jc42_data *data = i2c_get_clientdata(client); /* Restore original configuration except hysteresis */ if ((data->config & ~JC42_CFG_HYST_MASK) != (data->orig_config & ~JC42_CFG_HYST_MASK)) { int config; config = (data->orig_config & ~JC42_CFG_HYST_MASK) | (data->config & JC42_CFG_HYST_MASK); i2c_smbus_write_word_swapped(client, JC42_REG_CONFIG, config); } return 0; } #ifdef CONFIG_PM static int jc42_suspend(struct device *dev) { struct jc42_data *data = dev_get_drvdata(dev); data->config |= JC42_CFG_SHUTDOWN; i2c_smbus_write_word_swapped(data->client, JC42_REG_CONFIG, data->config); return 0; } static int jc42_resume(struct device *dev) { struct jc42_data *data = dev_get_drvdata(dev); data->config &= ~JC42_CFG_SHUTDOWN; i2c_smbus_write_word_swapped(data->client, JC42_REG_CONFIG, data->config); return 0; } static const struct dev_pm_ops jc42_dev_pm_ops = { .suspend = jc42_suspend, .resume = jc42_resume, }; #define JC42_DEV_PM_OPS (&jc42_dev_pm_ops) #else #define JC42_DEV_PM_OPS NULL #endif /* CONFIG_PM */ static const struct i2c_device_id jc42_id[] = { { "jc42", 0 }, { } }; MODULE_DEVICE_TABLE(i2c, jc42_id); #ifdef CONFIG_OF static const struct of_device_id jc42_of_ids[] = { { .compatible = "jedec,jc-42.4-temp", }, { } }; MODULE_DEVICE_TABLE(of, jc42_of_ids); #endif static struct i2c_driver jc42_driver = { .class = I2C_CLASS_SPD | I2C_CLASS_HWMON, .driver = { .name = "jc42", .pm = JC42_DEV_PM_OPS, .of_match_table = of_match_ptr(jc42_of_ids), }, .probe = jc42_probe, .remove = jc42_remove, .id_table = jc42_id, .detect = jc42_detect, .address_list = normal_i2c, }; module_i2c_driver(jc42_driver); MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>"); MODULE_DESCRIPTION("JC42 driver"); MODULE_LICENSE("GPL");
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