Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Andrew Jeffery | 1630 | 97.66% | 3 | 60.00% |
Javier Martinez Canillas | 37 | 2.22% | 1 | 20.00% |
Thomas Gleixner | 2 | 0.12% | 1 | 20.00% |
Total | 1669 | 5 |
// SPDX-License-Identifier: GPL-2.0-or-later /* * Copyright (C) 2017 IBM Corp. */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/init.h> #include <linux/err.h> #include <linux/i2c.h> #include "pmbus.h" enum max31785_regs { MFR_REVISION = 0x9b, MFR_FAN_CONFIG = 0xf1, }; #define MAX31785 0x3030 #define MAX31785A 0x3040 #define MFR_FAN_CONFIG_DUAL_TACH BIT(12) #define MAX31785_NR_PAGES 23 #define MAX31785_NR_FAN_PAGES 6 static int max31785_read_byte_data(struct i2c_client *client, int page, int reg) { if (page < MAX31785_NR_PAGES) return -ENODATA; switch (reg) { case PMBUS_VOUT_MODE: return -ENOTSUPP; case PMBUS_FAN_CONFIG_12: return pmbus_read_byte_data(client, page - MAX31785_NR_PAGES, reg); } return -ENODATA; } static int max31785_write_byte(struct i2c_client *client, int page, u8 value) { if (page < MAX31785_NR_PAGES) return -ENODATA; return -ENOTSUPP; } static int max31785_read_long_data(struct i2c_client *client, int page, int reg, u32 *data) { unsigned char cmdbuf[1]; unsigned char rspbuf[4]; int rc; struct i2c_msg msg[2] = { { .addr = client->addr, .flags = 0, .len = sizeof(cmdbuf), .buf = cmdbuf, }, { .addr = client->addr, .flags = I2C_M_RD, .len = sizeof(rspbuf), .buf = rspbuf, }, }; cmdbuf[0] = reg; rc = pmbus_set_page(client, page); if (rc < 0) return rc; rc = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg)); if (rc < 0) return rc; *data = (rspbuf[0] << (0 * 8)) | (rspbuf[1] << (1 * 8)) | (rspbuf[2] << (2 * 8)) | (rspbuf[3] << (3 * 8)); return rc; } static int max31785_get_pwm(struct i2c_client *client, int page) { int rv; rv = pmbus_get_fan_rate_device(client, page, 0, percent); if (rv < 0) return rv; else if (rv >= 0x8000) return 0; else if (rv >= 0x2711) return 0x2710; return rv; } static int max31785_get_pwm_mode(struct i2c_client *client, int page) { int config; int command; config = pmbus_read_byte_data(client, page, PMBUS_FAN_CONFIG_12); if (config < 0) return config; command = pmbus_read_word_data(client, page, PMBUS_FAN_COMMAND_1); if (command < 0) return command; if (config & PB_FAN_1_RPM) return (command >= 0x8000) ? 3 : 2; if (command >= 0x8000) return 3; else if (command >= 0x2711) return 0; return 1; } static int max31785_read_word_data(struct i2c_client *client, int page, int reg) { u32 val; int rv; switch (reg) { case PMBUS_READ_FAN_SPEED_1: if (page < MAX31785_NR_PAGES) return -ENODATA; rv = max31785_read_long_data(client, page - MAX31785_NR_PAGES, reg, &val); if (rv < 0) return rv; rv = (val >> 16) & 0xffff; break; case PMBUS_FAN_COMMAND_1: /* * PMBUS_FAN_COMMAND_x is probed to judge whether or not to * expose fan control registers. * * Don't expose fan_target attribute for virtual pages. */ rv = (page >= MAX31785_NR_PAGES) ? -ENOTSUPP : -ENODATA; break; case PMBUS_VIRT_PWM_1: rv = max31785_get_pwm(client, page); break; case PMBUS_VIRT_PWM_ENABLE_1: rv = max31785_get_pwm_mode(client, page); break; default: rv = -ENODATA; break; } return rv; } static inline u32 max31785_scale_pwm(u32 sensor_val) { /* * The datasheet describes the accepted value range for manual PWM as * [0, 0x2710], while the hwmon pwmX sysfs interface accepts values in * [0, 255]. The MAX31785 uses DIRECT mode to scale the FAN_COMMAND * registers and in PWM mode the coefficients are m=1, b=0, R=2. The * important observation here is that 0x2710 == 10000 == 100 * 100. * * R=2 (== 10^2 == 100) accounts for scaling the value provided at the * sysfs interface into the required hardware resolution, but it does * not yet yield a value that we can write to the device (this initial * scaling is handled by pmbus_data2reg()). Multiplying by 100 below * translates the parameter value into the percentage units required by * PMBus, and then we scale back by 255 as required by the hwmon pwmX * interface to yield the percentage value at the appropriate * resolution for hardware. */ return (sensor_val * 100) / 255; } static int max31785_pwm_enable(struct i2c_client *client, int page, u16 word) { int config = 0; int rate; switch (word) { case 0: rate = 0x7fff; break; case 1: rate = pmbus_get_fan_rate_cached(client, page, 0, percent); if (rate < 0) return rate; rate = max31785_scale_pwm(rate); break; case 2: config = PB_FAN_1_RPM; rate = pmbus_get_fan_rate_cached(client, page, 0, rpm); if (rate < 0) return rate; break; case 3: rate = 0xffff; break; default: return -EINVAL; } return pmbus_update_fan(client, page, 0, config, PB_FAN_1_RPM, rate); } static int max31785_write_word_data(struct i2c_client *client, int page, int reg, u16 word) { switch (reg) { case PMBUS_VIRT_PWM_1: return pmbus_update_fan(client, page, 0, 0, PB_FAN_1_RPM, max31785_scale_pwm(word)); case PMBUS_VIRT_PWM_ENABLE_1: return max31785_pwm_enable(client, page, word); default: break; } return -ENODATA; } #define MAX31785_FAN_FUNCS \ (PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12 | PMBUS_HAVE_PWM12) #define MAX31785_TEMP_FUNCS \ (PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP) #define MAX31785_VOUT_FUNCS \ (PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT) static const struct pmbus_driver_info max31785_info = { .pages = MAX31785_NR_PAGES, .write_word_data = max31785_write_word_data, .read_byte_data = max31785_read_byte_data, .read_word_data = max31785_read_word_data, .write_byte = max31785_write_byte, /* RPM */ .format[PSC_FAN] = direct, .m[PSC_FAN] = 1, .b[PSC_FAN] = 0, .R[PSC_FAN] = 0, /* PWM */ .format[PSC_PWM] = direct, .m[PSC_PWM] = 1, .b[PSC_PWM] = 0, .R[PSC_PWM] = 2, .func[0] = MAX31785_FAN_FUNCS, .func[1] = MAX31785_FAN_FUNCS, .func[2] = MAX31785_FAN_FUNCS, .func[3] = MAX31785_FAN_FUNCS, .func[4] = MAX31785_FAN_FUNCS, .func[5] = MAX31785_FAN_FUNCS, .format[PSC_TEMPERATURE] = direct, .m[PSC_TEMPERATURE] = 1, .b[PSC_TEMPERATURE] = 0, .R[PSC_TEMPERATURE] = 2, .func[6] = MAX31785_TEMP_FUNCS, .func[7] = MAX31785_TEMP_FUNCS, .func[8] = MAX31785_TEMP_FUNCS, .func[9] = MAX31785_TEMP_FUNCS, .func[10] = MAX31785_TEMP_FUNCS, .func[11] = MAX31785_TEMP_FUNCS, .func[12] = MAX31785_TEMP_FUNCS, .func[13] = MAX31785_TEMP_FUNCS, .func[14] = MAX31785_TEMP_FUNCS, .func[15] = MAX31785_TEMP_FUNCS, .func[16] = MAX31785_TEMP_FUNCS, .format[PSC_VOLTAGE_OUT] = direct, .m[PSC_VOLTAGE_OUT] = 1, .b[PSC_VOLTAGE_OUT] = 0, .R[PSC_VOLTAGE_OUT] = 0, .func[17] = MAX31785_VOUT_FUNCS, .func[18] = MAX31785_VOUT_FUNCS, .func[19] = MAX31785_VOUT_FUNCS, .func[20] = MAX31785_VOUT_FUNCS, .func[21] = MAX31785_VOUT_FUNCS, .func[22] = MAX31785_VOUT_FUNCS, }; static int max31785_configure_dual_tach(struct i2c_client *client, struct pmbus_driver_info *info) { int ret; int i; for (i = 0; i < MAX31785_NR_FAN_PAGES; i++) { ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, i); if (ret < 0) return ret; ret = i2c_smbus_read_word_data(client, MFR_FAN_CONFIG); if (ret < 0) return ret; if (ret & MFR_FAN_CONFIG_DUAL_TACH) { int virtual = MAX31785_NR_PAGES + i; info->pages = virtual + 1; info->func[virtual] |= PMBUS_HAVE_FAN12; info->func[virtual] |= PMBUS_PAGE_VIRTUAL; } } return 0; } static int max31785_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct device *dev = &client->dev; struct pmbus_driver_info *info; bool dual_tach = false; s64 ret; if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA)) return -ENODEV; info = devm_kzalloc(dev, sizeof(struct pmbus_driver_info), GFP_KERNEL); if (!info) return -ENOMEM; *info = max31785_info; ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, 255); if (ret < 0) return ret; ret = i2c_smbus_read_word_data(client, MFR_REVISION); if (ret < 0) return ret; if (ret == MAX31785A) { dual_tach = true; } else if (ret == MAX31785) { if (!strcmp("max31785a", id->name)) dev_warn(dev, "Expected max3175a, found max31785: cannot provide secondary tachometer readings\n"); } else { return -ENODEV; } if (dual_tach) { ret = max31785_configure_dual_tach(client, info); if (ret < 0) return ret; } return pmbus_do_probe(client, id, info); } static const struct i2c_device_id max31785_id[] = { { "max31785", 0 }, { "max31785a", 0 }, { }, }; MODULE_DEVICE_TABLE(i2c, max31785_id); static const struct of_device_id max31785_of_match[] = { { .compatible = "maxim,max31785" }, { .compatible = "maxim,max31785a" }, { }, }; MODULE_DEVICE_TABLE(of, max31785_of_match); static struct i2c_driver max31785_driver = { .driver = { .name = "max31785", .of_match_table = max31785_of_match, }, .probe = max31785_probe, .remove = pmbus_do_remove, .id_table = max31785_id, }; module_i2c_driver(max31785_driver); MODULE_AUTHOR("Andrew Jeffery <andrew@aj.id.au>"); MODULE_DESCRIPTION("PMBus driver for the Maxim MAX31785"); MODULE_LICENSE("GPL");
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with Cregit http://github.com/cregit/cregit
Version 2.0-RC1