Signed-off-by: Arnaud Ebalard <arno@xxxxxxxxxxxx> Tested-by: Arnaud Ebalard <arno@xxxxxxxxxxxx> --- drivers/hwmon/Kconfig | 10 + drivers/hwmon/Makefile | 1 + drivers/hwmon/g762.c | 1058 ++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 1069 insertions(+) create mode 100644 drivers/hwmon/g762.c diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig index 89ac1cb..cb4879c 100644 --- a/drivers/hwmon/Kconfig +++ b/drivers/hwmon/Kconfig @@ -423,6 +423,16 @@ config SENSORS_G760A This driver can also be built as a module. If so, the module will be called g760a. +config SENSORS_G762 + tristate "GMT G762 and G763" + depends on I2C + help + If you say yes here you get support for Global Mixed-mode + Technology Inc G762 and G763 fan speed PWM controller chips. + + This driver can also be built as a module. If so, the module + will be called g762. + config SENSORS_GL518SM tristate "Genesys Logic GL518SM" depends on I2C diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile index 8d6d97e..4b49504 100644 --- a/drivers/hwmon/Makefile +++ b/drivers/hwmon/Makefile @@ -57,6 +57,7 @@ obj-$(CONFIG_SENSORS_F75375S) += f75375s.o obj-$(CONFIG_SENSORS_FAM15H_POWER) += fam15h_power.o obj-$(CONFIG_SENSORS_FSCHMD) += fschmd.o obj-$(CONFIG_SENSORS_G760A) += g760a.o +obj-$(CONFIG_SENSORS_G762) += g762.o obj-$(CONFIG_SENSORS_GL518SM) += gl518sm.o obj-$(CONFIG_SENSORS_GL520SM) += gl520sm.o obj-$(CONFIG_SENSORS_GPIO_FAN) += gpio-fan.o diff --git a/drivers/hwmon/g762.c b/drivers/hwmon/g762.c new file mode 100644 index 0000000..810b019 --- /dev/null +++ b/drivers/hwmon/g762.c @@ -0,0 +1,1058 @@ +/* + * g762 - Driver for the Global Mixed-mode Technology Inc. fan speed PWM + * controller chips from G762 family, i.e. G762 and G763 + * + * Copyright (C) 2013, Arnaud EBALARD <arno@xxxxxxxxxxxx> + * + * This work is based on a basic version for 2.6.31 kernel developed + * by Olivier Mouchet for LaCie NAS. Updates have been performed to run + * on recent kernels. Additional features have been added. Ability to + * configure various characteristics via .dts file has been added. + * Detailed datasheet on which this development is based is available + * here: + * + * http://natisbad.org/NAS/refs/GMT_EDS-762_763-080710-0.2.pdf + * + * Headers from previous developments have been kept below: + * + * Copyright (c) 2009 LaCie + * + * Author: Olivier Mouchet <olivier.mouchet@xxxxxxxxx> + * + * based on g760a code written by Herbert Valerio Riedel <hvr@xxxxxxx> + * Copyright (C) 2007 Herbert Valerio Riedel <hvr@xxxxxxx> + * + * g762: minimal datasheet available at: + * http://www.gmt.com.tw/product/datasheet/EDS-762_3.pdf + * + * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <linux/device.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/hwmon-sysfs.h> +#include <linux/err.h> +#include <linux/mutex.h> +#include <linux/kernel.h> +#include <linux/of.h> +#include <linux/of_device.h> + +#define DRVNAME "g762" + +static const struct i2c_device_id g762_id[] = { + { "g762", 0 }, + { "g763", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, g762_id); + +enum g762_regs { + G762_REG_SET_CNT = 0x00, + G762_REG_ACT_CNT = 0x01, + G762_REG_FAN_STA = 0x02, + G762_REG_SET_OUT = 0x03, + G762_REG_FAN_CMD1 = 0x04, + G762_REG_FAN_CMD2 = 0x05, +}; + +/* Config register bits */ +#define G762_REG_FAN_CMD1_DET_FAN_FAIL 0x80 /* enable fan_fail signal */ +#define G762_REG_FAN_CMD1_DET_FAN_OOC 0x40 /* enable fan_out_of_control */ +#define G762_REG_FAN_CMD1_OUT_MODE 0x20 /* out mode, pwm or dac */ +#define G762_REG_FAN_CMD1_FAN_MODE 0x10 /* fan mode: close or open loop */ +#define G762_REG_FAN_CMD1_CLK_DIV_ID1 0x08 /* clock divisor value */ +#define G762_REG_FAN_CMD1_CLK_DIV_ID0 0x04 +#define G762_REG_FAN_CMD1_PWM_POLARITY 0x02 /* pwm polarity */ +#define G762_REG_FAN_CMD1_PULSE_PER_REV 0x01 /* pulse per fan revolution */ + +#define G762_REG_FAN_CMD2_GEAR_MODE_1 0x08 /* fan gear mode */ +#define G762_REG_FAN_CMD2_GEAR_MODE_0 0x04 +#define G762_REG_FAN_CMD2_FAN_STARTV_1 0x02 /* fan startup voltage */ +#define G762_REG_FAN_CMD2_FAN_STARTV_0 0x01 + +#define G762_REG_FAN_STA_FAIL 0x02 /* fan fail */ +#define G762_REG_FAN_STA_OOC 0x01 /* fan out of control */ + +/* config register values */ +#define OUT_MODE_PWM 1 +#define OUT_MODE_DAC 0 + +#define FAN_MODE_CLOSED_LOOP 2 +#define FAN_MODE_OPEN_LOOP 1 + +/* register data is read (and cached) at most once per second */ +#define G762_UPDATE_INTERVAL (HZ) + +/* + * extract pulse count per fan revolution value (2 or 4) from given + * FAN_CMD1 register value + */ +#define PULSE_FROM_REG(reg) \ + ((((reg) & G762_REG_FAN_CMD1_PULSE_PER_REV)+1) << 1) + +/* + * extract fan clock divisor (1, 2, 4 or 8) from given FAN_CMD1 + * register value + */ +#define CLKDIV_FROM_REG(reg) \ + (1 << (((reg) & (G762_REG_FAN_CMD1_CLK_DIV_ID0 | \ + G762_REG_FAN_CMD1_CLK_DIV_ID1)) >> 2)) + +/* + * extract fan gear mode value (0, 1 or 2) from given FAN_CMD2 + * register value + */ +#define GEARMODE_FROM_REG(reg) \ + (1 << (((reg) & (G762_REG_FAN_CMD2_GEAR_MODE_0 | \ + G762_REG_FAN_CMD2_GEAR_MODE_1)) >> 2)) + +struct g762_data { + struct i2c_client *client; + struct device *hwmon_dev; + + /* update mutex */ + struct mutex update_lock; + + /* board specific parameters. */ + u32 clk; /* default 32kHz */ + + /* g762 register cache */ + bool valid; + unsigned long last_updated; /* in jiffies */ + + u8 set_cnt; /* RPM cmd in close loop control */ + u8 act_cnt; /* formula: cnt = (CLK * 30)/(rpm * P) */ + u8 fan_sta; /* bit 0: set when actual fan speed is more than + * 25% outside requested fan speed + * bit 1: set when no transition occurs on fan + * pin for 0.7s + */ + u8 set_out; /* output voltage/PWM duty in open loop control */ + u8 fan_cmd1; /* 0: FG_PLS_ID0 FG pulses count per revolution + * 0: 2 counts per revolution + * 1: 4 counts per revolution + * 1: PWM_POLARITY 1: negative_duty + * 0: positive_duty + * 2,3: [FG_CLOCK_ID0, FG_CLK_ID1] + * 00: Divide fan clock by 1 + * 01: Divide fan clock by 2 + * 10: Divide fan clock by 4 + * 11: Divide fan clock by 8 + * 4: FAN_MODE 1:close-loop, 0:open-loop + * 5: OUT_MODE 1:PWM, 0:DAC + * 6: DET_FAN_OOC enable "fan ooc" status + * 7: DET_FAN_FAIL enable "fan fail" status + */ + u8 fan_cmd2; /* 0,1: FAN_STARTV 0,1,2,3 -> 0,32,64,96 dac_code + * 2,3: FG_GEAR_MODE + * 00: div = 1 + * 01: div = 2 + * 10: div = 4 + * 4: Mask ALERT# (g763 only) + */ +}; + +/* + * sysfs PWM interface uses value from 0 to 255 when g762 FAN_SET_CNT register + * uses values from 255 (off) to 0 (full speed). + */ +#define PWM_FROM_CNT(cnt) (0xff-(cnt)) +#define PWM_TO_CNT(pwm) (0xff-(pwm)) + +/* + * Convert count value from fan controller register into fan speed RPM value. + * Note that the datasheet documents a basic formula. Influence of additional + * parameters have been infered from examples in the datasheet and tests: + * fan clock divisor, fan gear mode. + */ +static inline unsigned int rpm_from_cnt(u8 cnt, u32 clk, u16 p, + u8 clk_div, u8 gear_mode) +{ + if (cnt == 0 || cnt == 0xff) + return 0; + + return (clk*30*(gear_mode+1))/(cnt*p*clk_div); +} + +/* Convert fan RPM value from sysfs into count value */ +static inline unsigned char cnt_from_rpm(u32 rpm, u32 clk, u16 p, + u8 clk_div, u8 gear_mode) +{ + return (rpm == 0) ? 0xff : (clk*30*(gear_mode+1))/(rpm*p*clk_div); +} + +static inline int g762_read_value(struct i2c_client *client, + enum g762_regs reg) +{ + return i2c_smbus_read_byte_data(client, reg); +} + +static inline int g762_write_value(struct i2c_client *client, + enum g762_regs reg, u8 value) +{ + return i2c_smbus_write_byte_data(client, reg, value); +} + +/* helper to grab and cache data, at most one time per second */ +static struct g762_data *g762_update_client(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + struct g762_data *data = i2c_get_clientdata(client); + + mutex_lock(&data->update_lock); + if (time_after(jiffies, data->last_updated + G762_UPDATE_INTERVAL) || + unlikely(!data->valid)) { + data->set_cnt = g762_read_value(client, G762_REG_SET_CNT); + data->act_cnt = g762_read_value(client, G762_REG_ACT_CNT); + data->fan_sta = g762_read_value(client, G762_REG_FAN_STA); + data->set_out = g762_read_value(client, G762_REG_SET_OUT); + data->fan_cmd1 = g762_read_value(client, G762_REG_FAN_CMD1); + data->fan_cmd2 = g762_read_value(client, G762_REG_FAN_CMD2); + + data->last_updated = jiffies; + data->valid = 1; + } + mutex_unlock(&data->update_lock); + + return data; +} + + + +/* + * helpers for passing hardware characteristics via DT. Some of those + * are also used by sysfs handlers (write function) later in the file. + */ + + +/* Set pwm mode. Accepts either 0 (pwm mode) or 1 (linear mode) */ +static int do_set_pwm_mode(struct device *dev, unsigned long val) +{ + struct i2c_client *client = to_i2c_client(dev); + struct g762_data *data = g762_update_client(dev); + int ret = 0; + + mutex_lock(&data->update_lock); + switch (val) { + case OUT_MODE_PWM: + data->fan_cmd1 |= G762_REG_FAN_CMD1_OUT_MODE; + break; + case OUT_MODE_DAC: /* i.e. linear mode */ + data->fan_cmd1 &= ~G762_REG_FAN_CMD1_OUT_MODE; + break; + default: + ret = -EINVAL; + goto out; + } + g762_write_value(client, G762_REG_FAN_CMD1, data->fan_cmd1); + out: + mutex_unlock(&data->update_lock); + + return ret; +} + +/* + * Set reference clock. Accepted values are between 0 and 0xffffff. + * Note that this is an internal parameter, i.e. value is not passed + * to the device. + */ +static int do_set_pwm_freq(struct device *dev, unsigned long val) +{ + struct i2c_client *client = to_i2c_client(dev); + struct g762_data *data = i2c_get_clientdata(client); + int ret = -EINVAL; + + if (val <= 0xffffff) { + data->clk = val; + ret = 0; + } + + return ret; +} + +/* Set fan clock divisor. Accepted values are 1, 2, 4 and 8. */ +static int do_set_fan_div(struct device *dev, unsigned long val) +{ + struct i2c_client *client = to_i2c_client(dev); + struct g762_data *data = g762_update_client(dev); + int ret = 0; + + mutex_lock(&data->update_lock); + switch (val) { + case 1: + data->fan_cmd1 &= ~G762_REG_FAN_CMD1_CLK_DIV_ID0; + data->fan_cmd1 &= ~G762_REG_FAN_CMD1_CLK_DIV_ID1; + break; + case 2: + data->fan_cmd1 |= G762_REG_FAN_CMD1_CLK_DIV_ID0; + data->fan_cmd1 &= ~G762_REG_FAN_CMD1_CLK_DIV_ID1; + break; + case 4: + data->fan_cmd1 &= ~G762_REG_FAN_CMD1_CLK_DIV_ID0; + data->fan_cmd1 |= G762_REG_FAN_CMD1_CLK_DIV_ID1; + break; + case 8: + data->fan_cmd1 |= G762_REG_FAN_CMD1_CLK_DIV_ID0; + data->fan_cmd1 |= G762_REG_FAN_CMD1_CLK_DIV_ID1; + break; + default: + ret = -EINVAL; + goto out; + } + g762_write_value(client, G762_REG_FAN_CMD1, data->fan_cmd1); + out: + mutex_unlock(&data->update_lock); + + return ret; +} + +/* Set fan gear mode. Accepted values are either 0, 1 or 2. */ +static int do_set_fan_gear_mode(struct device *dev, unsigned long val) +{ + struct i2c_client *client = to_i2c_client(dev); + struct g762_data *data = g762_update_client(dev); + int ret = 0; + + mutex_lock(&data->update_lock); + switch (val) { + case 0: + data->fan_cmd2 &= ~G762_REG_FAN_CMD2_GEAR_MODE_0; + data->fan_cmd2 &= ~G762_REG_FAN_CMD2_GEAR_MODE_1; + break; + case 1: + data->fan_cmd2 |= G762_REG_FAN_CMD2_GEAR_MODE_0; + data->fan_cmd2 &= ~G762_REG_FAN_CMD2_GEAR_MODE_1; + break; + case 2: + data->fan_cmd2 &= ~G762_REG_FAN_CMD2_GEAR_MODE_0; + data->fan_cmd2 |= G762_REG_FAN_CMD2_GEAR_MODE_1; + break; + default: + ret = -EINVAL; + goto out; + } + g762_write_value(client, G762_REG_FAN_CMD2, data->fan_cmd2); + out: + mutex_unlock(&data->update_lock); + + return ret; +} + +/* Set pulse per revolution value. Accepts either 2 or 4. */ +static int do_set_fan_pulses(struct device *dev, unsigned long val) +{ + struct i2c_client *client = to_i2c_client(dev); + struct g762_data *data = g762_update_client(dev); + int ret = 0; + + mutex_lock(&data->update_lock); + switch (val) { + case 2: + data->fan_cmd1 &= ~G762_REG_FAN_CMD1_PULSE_PER_REV; + break; + case 4: + data->fan_cmd1 |= G762_REG_FAN_CMD1_PULSE_PER_REV; + break; + default: + ret = -EINVAL; + goto out; + } + g762_write_value(client, G762_REG_FAN_CMD1, data->fan_cmd1); + out: + mutex_unlock(&data->update_lock); + + return ret; +} + +/* Set fan mode. Accepts either 1 (open loop) or 2 (closed loop). */ +static int do_set_pwm_enable(struct device *dev, unsigned long val) +{ + struct i2c_client *client = to_i2c_client(dev); + struct g762_data *data = g762_update_client(dev); + int ret = 0; + + mutex_lock(&data->update_lock); + switch (val) { + case FAN_MODE_OPEN_LOOP: + data->fan_cmd1 &= ~G762_REG_FAN_CMD1_FAN_MODE; + break; + case FAN_MODE_CLOSED_LOOP: + data->fan_cmd1 |= G762_REG_FAN_CMD1_FAN_MODE; + break; + default: + ret = -EINVAL; + goto out; + } + + g762_write_value(client, G762_REG_FAN_CMD1, data->fan_cmd1); + out: + mutex_unlock(&data->update_lock); + + return ret; +} + +/* Set pwm polarity (0 for negative duty, 1 for positive duty) */ +static int do_set_pwm_polarity(struct device *dev, unsigned long val) +{ + struct i2c_client *client = to_i2c_client(dev); + struct g762_data *data = g762_update_client(dev); + int ret = 0; + + mutex_lock(&data->update_lock); + switch (val) { + case 0: /* i.e. negative duty */ + data->fan_cmd1 &= ~G762_REG_FAN_CMD1_PWM_POLARITY; + break; + case 1: /* i.e. positive duty */ + data->fan_cmd1 |= G762_REG_FAN_CMD1_PWM_POLARITY; + break; + default: + ret = -EINVAL; + goto out; + } + g762_write_value(client, G762_REG_FAN_CMD1, data->fan_cmd1); + out: + mutex_unlock(&data->update_lock); + + return ret; +} + +/* + * Set pwm value. Accepted values are between 0 and 255. Note that the + * internal register used for setting the value depends ont the fan + * mode of the device. + */ +static int do_set_pwm(struct device *dev, unsigned long val) +{ + struct i2c_client *client = to_i2c_client(dev); + struct g762_data *data = g762_update_client(dev); + int ret = -EINVAL; + + mutex_lock(&data->update_lock); + if (val > 255) + goto out; + + if (data->fan_cmd1 & G762_REG_FAN_CMD1_FAN_MODE) { /* closed-loop */ + data->set_cnt = PWM_TO_CNT(val); + g762_write_value(client, G762_REG_SET_CNT, (u8)val); + } else { /* open-loop */ + data->set_out = val; + g762_write_value(client, G762_REG_SET_OUT, (u8)val); + } + + ret = 0; + out: + mutex_unlock(&data->update_lock); + + return ret; +} + +/* Set fan RPM value. This only makes sense in closed-loop mode. */ +static int do_set_fan_target(struct device *dev, unsigned long val) +{ + struct i2c_client *client = to_i2c_client(dev); + struct g762_data *data = g762_update_client(dev); + int ret = -EINVAL; + + mutex_lock(&data->update_lock); + if (data->fan_cmd1 & G762_REG_FAN_CMD1_FAN_MODE) { /* closed-loop */ + data->set_cnt = cnt_from_rpm(val, data->clk, + PULSE_FROM_REG(data->fan_cmd1), + CLKDIV_FROM_REG(data->fan_cmd1), + GEARMODE_FROM_REG(data->fan_cmd2)); + g762_write_value(client, G762_REG_SET_CNT, data->set_cnt); + ret = 0; + } + mutex_unlock(&data->update_lock); + + return ret; +} + +/* Enable/disable fan failure detection. Accepted values are 1 and 0. */ +static int do_fan_failure_detection_toggle(struct device *dev, + unsigned long enable) +{ + struct i2c_client *client = to_i2c_client(dev); + struct g762_data *data = g762_update_client(dev); + int ret = 0; + + mutex_lock(&data->update_lock); + switch (enable) { + case 0: + data->fan_cmd1 &= ~G762_REG_FAN_CMD1_DET_FAN_FAIL; + break; + case 1: + data->fan_cmd1 |= G762_REG_FAN_CMD1_DET_FAN_FAIL; + break; + default: + ret = -EINVAL; + goto out; + } + g762_write_value(client, G762_REG_FAN_CMD1, data->fan_cmd1); + out: + mutex_unlock(&data->update_lock); + + return ret; +} + +/* Enable/disable fan out of control detection. Accepted values are 1 and 0 */ +static int do_fan_ooc_detection_toggle(struct device *dev, unsigned int enable) +{ + struct i2c_client *client = to_i2c_client(dev); + struct g762_data *data = g762_update_client(dev); + int ret = 0; + + mutex_lock(&data->update_lock); + switch (enable) { + case 0: + data->fan_cmd1 &= ~G762_REG_FAN_CMD1_DET_FAN_OOC; + break; + case 1: + data->fan_cmd1 |= G762_REG_FAN_CMD1_DET_FAN_OOC; + break; + default: + ret = -EINVAL; + goto out; + } + g762_write_value(client, G762_REG_FAN_CMD1, data->fan_cmd1); + out: + mutex_unlock(&data->update_lock); + + return ret; +} + +/* Set startup voltage. Accepted values are either 0, 1, 2 or 3. */ +static int do_set_fan_startv(struct device *dev, unsigned long val) +{ + struct i2c_client *client = to_i2c_client(dev); + struct g762_data *data = g762_update_client(dev); + int ret = 0; + + mutex_lock(&data->update_lock); + switch (val) { + case 0: + data->fan_cmd2 &= ~G762_REG_FAN_CMD2_FAN_STARTV_0; + data->fan_cmd2 &= ~G762_REG_FAN_CMD2_FAN_STARTV_1; + break; + case 1: + data->fan_cmd2 |= G762_REG_FAN_CMD2_FAN_STARTV_0; + data->fan_cmd2 &= ~G762_REG_FAN_CMD2_FAN_STARTV_1; + break; + case 2: + data->fan_cmd2 &= ~G762_REG_FAN_CMD2_FAN_STARTV_0; + data->fan_cmd2 |= G762_REG_FAN_CMD2_FAN_STARTV_1; + break; + case 3: + data->fan_cmd2 |= G762_REG_FAN_CMD2_FAN_STARTV_0; + data->fan_cmd2 |= G762_REG_FAN_CMD2_FAN_STARTV_1; + break; + default: + ret = -EINVAL; + goto out; + } + g762_write_value(client, G762_REG_FAN_CMD2, data->fan_cmd2); + out: + mutex_unlock(&data->update_lock); + + return ret; +} + + + +/* + * Configuration-related definitions + */ + +struct g762_config { + u32 fan_startv; + u32 fan_gear_mode; + u32 fan_div; + u32 fan_pulses; + u32 fan_target; + u32 pwm_polarity; + u32 pwm_enable; + u32 pwm_freq; + u32 pwm_mode; +}; + +/* + * g762 default values: it is assumed that the fan is set for a 32KHz clock + * source, a fan clock divisor of 1 and two pulses per revolution. Default + * fan driving mode is linear mode (g762/g763 also support PWM mode). Note + * the specific init value for properties which may be left unmodified. + */ +#define G762_DEFAULT_CLK 32768 +#define G762_DEFAULT_FAN_DIV 1 +#define G762_DEFAULT_FAN_PULSES 2 +#define G762_DEFAULT_OUT_MODE 0 +#define G762_DEFAULT_FAN_MODE 2 +#define G762_DEFAULT_FAN_STARTV 1 +#define G762_DEFAULT_FAN_GEAR_MODE 0 +#define G762_DEFAULT_FAN_POLARITY 0 +#define G762_UNTOUCHED_VAL 0xffffffff + +static void g762_config_init(struct g762_config *conf) +{ + conf->pwm_enable = G762_DEFAULT_FAN_MODE; + conf->pwm_mode = G762_DEFAULT_OUT_MODE; + conf->pwm_freq = G762_DEFAULT_CLK; + conf->pwm_polarity = G762_DEFAULT_FAN_POLARITY; + conf->fan_pulses = G762_DEFAULT_FAN_PULSES; + conf->fan_div = G762_DEFAULT_FAN_DIV; + conf->fan_startv = G762_DEFAULT_FAN_STARTV; + conf->fan_gear_mode = G762_DEFAULT_FAN_GEAR_MODE; + conf->fan_target = G762_UNTOUCHED_VAL; +} + +static inline int g762_one_prop_commit(struct i2c_client *client, + u32 pval, const char *pname, + int (*psetter)(struct device *dev, + unsigned long val)) +{ + int ret = 0; + + if ((pval != G762_UNTOUCHED_VAL) && (*psetter)(&client->dev, pval)) { + dev_info(&client->dev, "unable to set %s (%d)\n", pname, pval); + ret = -EINVAL; + } + + return ret; +} + +static int g762_config_commit(struct i2c_client *client, + struct g762_config *conf) +{ + int ret = 0; + + if (g762_one_prop_commit(client, conf->pwm_mode, + "pwm_mode", &do_set_pwm_mode) || + g762_one_prop_commit(client, conf->pwm_enable, + "pwm_enable", &do_set_pwm_enable) || + g762_one_prop_commit(client, conf->fan_div, + "fan_div", &do_set_fan_div) || + g762_one_prop_commit(client, conf->fan_pulses, + "fan_pulses", &do_set_fan_pulses) || + g762_one_prop_commit(client, conf->pwm_freq, + "pwm_freq", &do_set_pwm_freq) || + g762_one_prop_commit(client, conf->fan_gear_mode, + "fan_gear_mode", &do_set_fan_gear_mode) || + g762_one_prop_commit(client, conf->pwm_polarity, + "pwm_polarity", &do_set_pwm_polarity) || + g762_one_prop_commit(client, conf->fan_startv, + "fan_startv", &do_set_fan_startv) || + g762_one_prop_commit(client, conf->fan_target, + "fan_target", &do_set_fan_target)) { + ret = -EINVAL; + } + + return ret; +} + + +/* + * Helpers to import hardware characteristics from .dts file and overload + * default config values. + */ + +#ifdef CONFIG_OF +static struct of_device_id g762_dt_match[] = { + { .compatible = "gmt,g762" }, + { .compatible = "gmt,g763" }, + { }, +}; + +static inline void g762_of_import_one_prop(struct i2c_client *client, + u32 *dest, const char *pname) +{ + const __be32 *prop; + int len; + + prop = of_get_property(client->dev.of_node, pname, &len); + if (prop && len == sizeof(u32)) { + *dest = be32_to_cpu(prop[0]); + dev_info(&client->dev, "found %s (%d)\n", pname, *dest); + } +} + +static void g762_config_of_overload(struct i2c_client *client, + struct g762_config *conf) +{ + if (!client->dev.of_node) + return; + + g762_of_import_one_prop(client, &conf->fan_gear_mode, "fan_gear_mode"); + g762_of_import_one_prop(client, &conf->pwm_polarity, "pwm_polarity"); + g762_of_import_one_prop(client, &conf->fan_startv, "fan_startv"); + g762_of_import_one_prop(client, &conf->pwm_freq, "pwm_freq"); + g762_of_import_one_prop(client, &conf->fan_div, "fan_div"); + g762_of_import_one_prop(client, &conf->fan_pulses, "fan_pulses"); + g762_of_import_one_prop(client, &conf->pwm_mode, "pwm_mode"); + g762_of_import_one_prop(client, &conf->fan_target, "fan_target"); + g762_of_import_one_prop(client, &conf->pwm_enable, "pwm_enable"); +} +#else +static void g762_config_of_overload(struct i2c_client *client, + struct g762_config *conf) { }; +#endif + + + +/* + * sysfs attributes + */ + + +/* + * Read function for fan1_input sysfs file. Return current fan RPM value, or + * 0 if fan is out of control + */ +static ssize_t get_fan_rpm(struct device *dev, struct device_attribute *da, + char *buf) +{ + struct g762_data *data = g762_update_client(dev); + unsigned int rpm = 0; + + mutex_lock(&data->update_lock); + /* reverse logic: fan out of control reporting is enabled low */ + if (data->fan_sta & G762_REG_FAN_STA_OOC) { + rpm = rpm_from_cnt(data->act_cnt, data->clk, + PULSE_FROM_REG(data->fan_cmd1), + CLKDIV_FROM_REG(data->fan_cmd1), + GEARMODE_FROM_REG(data->fan_cmd2)); + } + mutex_unlock(&data->update_lock); + + return sprintf(buf, "%u\n", rpm); +} + + +/* + * Read and write functions for pwm1_mode sysfs file. Get and set fan speed + * control mode i.e. pwm (1) or linear (0). + */ +static ssize_t get_pwm_mode(struct device *dev, struct device_attribute *da, + char *buf) +{ + struct g762_data *data = g762_update_client(dev); + int pwm_mode; + + pwm_mode = (data->fan_cmd1 & G762_REG_FAN_CMD1_OUT_MODE) ? 1 : 0; + + return sprintf(buf, "%d\n", pwm_mode); +} + +static ssize_t set_pwm_mode(struct device *dev, struct device_attribute *da, + const char *buf, size_t count) +{ + unsigned long val; + + if (kstrtoul(buf, 10, &val) || do_set_pwm_mode(dev, val)) + return -EINVAL; + + return count; +} + + +/* + * Read and write functions for fan1_div sysfs file. Get and set fan + * controller prescaler value + */ +static ssize_t get_fan_div(struct device *dev, + struct device_attribute *da, char *buf) +{ + struct g762_data *data = g762_update_client(dev); + + return sprintf(buf, "%d\n", CLKDIV_FROM_REG(data->fan_cmd1)); +} + +static ssize_t set_fan_div(struct device *dev, + struct device_attribute *da, + const char *buf, size_t count) +{ + unsigned long val; + + if (kstrtoul(buf, 10, &val) || do_set_fan_div(dev, val)) + return -EINVAL; + + return count; +} + + +/* + * Following documentation about hwmon's sysfs interface, a pwm1_enable node + * should accept followings: + * + * 0 : no fan speed control (i.e. fan at full speed) + * 1 : manual fan speed control enabled (use pwm[1-*]) (open-loop) + * 2+: automatic fan speed control enabled (use fan[1-*]_enable)(close-loop) + * + * but we do not accept 0 as "no-control" mode is not supported by g762, + * -EINVAL is returned in this case. + */ +static ssize_t get_pwm_enable(struct device *dev, + struct device_attribute *da, char *buf) +{ + struct g762_data *data = g762_update_client(dev); + int fan_mode; + + fan_mode = (data->fan_cmd1 & G762_REG_FAN_CMD1_FAN_MODE) ? 2 : 1; + + return sprintf(buf, "%d\n", fan_mode); +} + +static ssize_t set_pwm_enable(struct device *dev, + struct device_attribute *da, + const char *buf, size_t count) +{ + unsigned long val; + + if (kstrtoul(buf, 10, &val) || do_set_pwm_enable(dev, val)) + return -EINVAL; + + return count; +} + + +/* + * Get/set the fan speed in open-loop mode using pwm1 sysfs file. Speed is + * given as a relative value from 0 to 255, where 255 is maximum speed. Note + * that this is done by writing directly to the chip's DAC, it won't change + * the closed loop speed set by fan1_target. Also note that due to rounding + * errors it is possible that you don't read back exactly the value you have + * set. + */ +static ssize_t get_pwm(struct device *dev, struct device_attribute *da, + char *buf) +{ + struct g762_data *data = g762_update_client(dev); + int val; + + mutex_lock(&data->update_lock); + if (data->fan_cmd1 & G762_REG_FAN_CMD1_FAN_MODE) { /* closed-loop */ + val = PWM_FROM_CNT(data->set_cnt); + } else { /* open-loop */ + val = data->set_out; + } + mutex_unlock(&data->update_lock); + + return sprintf(buf, "%d\n", val); +} + +static ssize_t set_pwm(struct device *dev, struct device_attribute *da, + const char *buf, size_t count) +{ + unsigned long val; + + if (kstrtoul(buf, 10, &val) || do_set_pwm(dev, val)) + return -EINVAL; + + return count; +} + + +/* + * Get/set the fan speed in closed-loop mode using fan1_target sysfs file. Speed + * is given as a rpm value, then G762 will automatically regulate the fan speed + * using pulses from fan tachometer. + * + * Refer to rpm_from_cnt implementation to get info about count number + * calculation. + * + * Also note that due to rounding errors it is possible that you don't read + * back exactly the value you have set. + */ +static ssize_t get_fan_target(struct device *dev, struct device_attribute *da, + char *buf) +{ + struct g762_data *data = g762_update_client(dev); + unsigned int rpm; + ssize_t err; + + mutex_lock(&data->update_lock); + if (data->fan_cmd1 & G762_REG_FAN_CMD1_FAN_MODE) { /* closed-loop */ + rpm = rpm_from_cnt(data->set_cnt, data->clk, + PULSE_FROM_REG(data->fan_cmd1), + CLKDIV_FROM_REG(data->fan_cmd1), + GEARMODE_FROM_REG(data->fan_cmd2)); + err = sprintf(buf, "%u\n", rpm); + } else { /* open-loop */ + err = -EINVAL; + } + mutex_unlock(&data->update_lock); + + return err; +} + +static ssize_t set_fan_target(struct device *dev, struct device_attribute *da, + const char *buf, size_t count) +{ + unsigned long val; + + if (kstrtoul(buf, 10, &val) || do_set_fan_target(dev, val)) + return -EINVAL; + + return count; +} + + +/* read function for fan1_fault sysfs file. */ +static ssize_t get_fan_failure(struct device *dev, struct device_attribute *da, + char *buf) +{ + struct g762_data *data = g762_update_client(dev); + unsigned int val; + + val = (data->fan_sta & G762_REG_FAN_STA_FAIL) ? 1 : 0; + + return sprintf(buf, "%u\n", val); +} + + +/* read function for fan1_alarm sysfs file. */ +static ssize_t get_fan_ooc(struct device *dev, struct device_attribute *da, + char *buf) +{ + struct g762_data *data = g762_update_client(dev); + unsigned int val; + + /* ooc condition is enabled low */ + val = (data->fan_sta & G762_REG_FAN_STA_OOC) ? 0 : 1; + + return sprintf(buf, "%u\n", val); +} + + +static DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, + get_pwm, set_pwm); +static DEVICE_ATTR(pwm1_mode, S_IWUSR | S_IRUGO, + get_pwm_mode, set_pwm_mode); +static DEVICE_ATTR(pwm1_enable, S_IWUSR | S_IRUGO, + get_pwm_enable, set_pwm_enable); + +static DEVICE_ATTR(fan1_input, S_IRUGO, + get_fan_rpm, NULL); +static DEVICE_ATTR(fan1_alarm, S_IRUGO, + get_fan_ooc, NULL); +static DEVICE_ATTR(fan1_fault, S_IRUGO, + get_fan_failure, NULL); +static DEVICE_ATTR(fan1_target, S_IWUSR | S_IRUGO, + get_fan_target, set_fan_target); +static DEVICE_ATTR(fan1_div, S_IWUSR | S_IRUGO, + get_fan_div, set_fan_div); + +/* Driver data */ +static struct attribute *g762_attributes[] = { + &dev_attr_fan1_input.attr, + &dev_attr_fan1_alarm.attr, + &dev_attr_fan1_fault.attr, + &dev_attr_fan1_target.attr, + &dev_attr_fan1_div.attr, + &dev_attr_pwm1.attr, + &dev_attr_pwm1_mode.attr, + &dev_attr_pwm1_enable.attr, + NULL +}; + +static const struct attribute_group g762_group = { + .attrs = g762_attributes, +}; + +static int g762_probe(struct i2c_client *client, const struct i2c_device_id *id) +{ + struct g762_data *data; + struct g762_config conf; + int err = 0; + + if (!i2c_check_functionality(client->adapter, + I2C_FUNC_SMBUS_BYTE_DATA)) { + err = -ENODEV; + goto out; + } + + data = devm_kzalloc(&client->dev, sizeof(struct g762_data), GFP_KERNEL); + if (!data) { + err = -ENOMEM; + goto out; + } + i2c_set_clientdata(client, data); + + data->client = client; + mutex_init(&data->update_lock); + + /* Enable fan protection and fan fail detection by default */ + do_fan_ooc_detection_toggle(&client->dev, 1); + do_fan_failure_detection_toggle(&client->dev, 1); + + /* + * Set default configuration values before passing the structure + * to OF helpers to overload them using those provided by .dts + * file (if any). Final config is then commited. + */ + g762_config_init(&conf); + g762_config_of_overload(client, &conf); + err = g762_config_commit(client, &conf); + if (err) + goto out; + + /* Register sysfs hooks */ + err = sysfs_create_group(&client->dev.kobj, &g762_group); + if (err) + goto out; + + data->hwmon_dev = (struct device *)hwmon_device_register(&client->dev); + if (IS_ERR(data->hwmon_dev)) { + err = PTR_ERR(data->hwmon_dev); + sysfs_remove_group(&client->dev.kobj, &g762_group); + goto out; + } + + dev_info(&data->client->dev, "device successfully initialized\n"); + + out: + return err; +} + +static int g762_remove(struct i2c_client *client) +{ + struct g762_data *data = i2c_get_clientdata(client); + + hwmon_device_unregister(data->hwmon_dev); + sysfs_remove_group(&client->dev.kobj, &g762_group); + + dev_info(&data->client->dev, "device successfully removed\n"); + return 0; +} + +static struct i2c_driver g762_driver = { + .driver = { + .name = DRVNAME, + .owner = THIS_MODULE, + .of_match_table = of_match_ptr(g762_dt_match), + }, + .probe = g762_probe, + .remove = g762_remove, + .id_table = g762_id, +}; + +module_i2c_driver(g762_driver); + +MODULE_AUTHOR("Olivier Mouchet <olivier.mouchet@xxxxxxxxx>"); +MODULE_DESCRIPTION("GMT G762 driver"); +MODULE_LICENSE("GPL"); -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
