2 * g762 - Driver for the Global Mixed-mode Technology Inc. fan speed
3 * PWM controller chips from G762 family, i.e. G762 and G763
5 * Copyright (C) 2013, Arnaud EBALARD <arno@natisbad.org>
7 * This work is based on a basic version for 2.6.31 kernel developed
8 * by Olivier Mouchet for LaCie. Updates and correction have been
9 * performed to run on recent kernels. Additional features, like the
10 * ability to configure various characteristics via .dts file or
11 * board init file have been added. Detailed datasheet on which this
12 * development is based is available here:
14 * http://natisbad.org/NAS/refs/GMT_EDS-762_763-080710-0.2.pdf
16 * Headers from previous developments have been kept below:
18 * Copyright (c) 2009 LaCie
20 * Author: Olivier Mouchet <olivier.mouchet@gmail.com>
22 * based on g760a code written by Herbert Valerio Riedel <hvr@gnu.org>
23 * Copyright (C) 2007 Herbert Valerio Riedel <hvr@gnu.org>
25 * g762: minimal datasheet available at:
26 * http://www.gmt.com.tw/product/datasheet/EDS-762_3.pdf
28 * This program is free software; you can redistribute it and/or modify
29 * it under the terms of the GNU General Public License as published by
30 * the Free Software Foundation; either version 2 of the License, or
31 * (at your option) any later version.
33 * This program is distributed in the hope that it will be useful,
34 * but WITHOUT ANY WARRANTY; without even the implied warranty of
35 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
36 * GNU General Public License for more details.
38 * You should have received a copy of the GNU General Public License
39 * along with this program; if not, write to the Free Software
43 #include <linux/device.h>
44 #include <linux/module.h>
45 #include <linux/init.h>
46 #include <linux/jiffies.h>
47 #include <linux/i2c.h>
48 #include <linux/hwmon.h>
49 #include <linux/hwmon-sysfs.h>
50 #include <linux/err.h>
51 #include <linux/mutex.h>
52 #include <linux/kernel.h>
53 #include <linux/clk.h>
55 #include <linux/of_device.h>
56 #include <linux/platform_data/g762.h>
58 #define DRVNAME "g762"
60 static const struct i2c_device_id g762_id[] = {
65 MODULE_DEVICE_TABLE(i2c, g762_id);
68 G762_REG_SET_CNT = 0x00,
69 G762_REG_ACT_CNT = 0x01,
70 G762_REG_FAN_STA = 0x02,
71 G762_REG_SET_OUT = 0x03,
72 G762_REG_FAN_CMD1 = 0x04,
73 G762_REG_FAN_CMD2 = 0x05,
76 /* Config register bits */
77 #define G762_REG_FAN_CMD1_DET_FAN_FAIL 0x80 /* enable fan_fail signal */
78 #define G762_REG_FAN_CMD1_DET_FAN_OOC 0x40 /* enable fan_out_of_control */
79 #define G762_REG_FAN_CMD1_OUT_MODE 0x20 /* out mode: PWM or DC */
80 #define G762_REG_FAN_CMD1_FAN_MODE 0x10 /* fan mode: closed/open-loop */
81 #define G762_REG_FAN_CMD1_CLK_DIV_ID1 0x08 /* clock divisor value */
82 #define G762_REG_FAN_CMD1_CLK_DIV_ID0 0x04
83 #define G762_REG_FAN_CMD1_PWM_POLARITY 0x02 /* PWM polarity */
84 #define G762_REG_FAN_CMD1_PULSE_PER_REV 0x01 /* pulse per fan revolution */
86 #define G762_REG_FAN_CMD2_GEAR_MODE_1 0x08 /* fan gear mode */
87 #define G762_REG_FAN_CMD2_GEAR_MODE_0 0x04
88 #define G762_REG_FAN_CMD2_FAN_STARTV_1 0x02 /* fan startup voltage */
89 #define G762_REG_FAN_CMD2_FAN_STARTV_0 0x01
91 #define G762_REG_FAN_STA_FAIL 0x02 /* fan fail */
92 #define G762_REG_FAN_STA_OOC 0x01 /* fan out of control */
94 /* Config register values */
95 #define G762_OUT_MODE_PWM 1
96 #define G762_OUT_MODE_DC 0
98 #define G762_FAN_MODE_CLOSED_LOOP 2
99 #define G762_FAN_MODE_OPEN_LOOP 1
101 #define G762_PWM_POLARITY_NEGATIVE 1
102 #define G762_PWM_POLARITY_POSITIVE 0
104 /* Register data is read (and cached) at most once per second. */
105 #define G762_UPDATE_INTERVAL HZ
108 * Extract pulse count per fan revolution value (2 or 4) from given
109 * FAN_CMD1 register value.
111 #define G762_PULSE_FROM_REG(reg) \
112 ((((reg) & G762_REG_FAN_CMD1_PULSE_PER_REV) + 1) << 1)
115 * Extract fan clock divisor (1, 2, 4 or 8) from given FAN_CMD1
118 #define G762_CLKDIV_FROM_REG(reg) \
119 (1 << (((reg) & (G762_REG_FAN_CMD1_CLK_DIV_ID0 | \
120 G762_REG_FAN_CMD1_CLK_DIV_ID1)) >> 2))
123 * Extract fan gear mode multiplier value (0, 2 or 4) from given
124 * FAN_CMD2 register value.
126 #define G762_GEARMULT_FROM_REG(reg) \
127 (1 << (((reg) & (G762_REG_FAN_CMD2_GEAR_MODE_0 | \
128 G762_REG_FAN_CMD2_GEAR_MODE_1)) >> 2))
131 struct i2c_client *client;
132 struct device *hwmon_dev;
136 struct mutex update_lock;
138 /* board specific parameters. */
141 /* g762 register cache */
143 unsigned long last_updated; /* in jiffies */
145 u8 set_cnt; /* controls fan rotation speed in closed-loop mode */
146 u8 act_cnt; /* provides access to current fan RPM value */
147 u8 fan_sta; /* bit 0: set when actual fan speed is more than
148 * 25% outside requested fan speed
149 * bit 1: set when no transition occurs on fan
152 u8 set_out; /* controls fan rotation speed in open-loop mode */
153 u8 fan_cmd1; /* 0: FG_PLS_ID0 FG pulses count per revolution
154 * 0: 2 counts per revolution
155 * 1: 4 counts per revolution
156 * 1: PWM_POLARITY 1: negative_duty
158 * 2,3: [FG_CLOCK_ID0, FG_CLK_ID1]
159 * 00: Divide fan clock by 1
160 * 01: Divide fan clock by 2
161 * 10: Divide fan clock by 4
162 * 11: Divide fan clock by 8
163 * 4: FAN_MODE 1:closed-loop, 0:open-loop
164 * 5: OUT_MODE 1:PWM, 0:DC
165 * 6: DET_FAN_OOC enable "fan ooc" status
166 * 7: DET_FAN_FAIL enable "fan fail" status
168 u8 fan_cmd2; /* 0,1: FAN_STARTV 0,1,2,3 -> 0,32,64,96 dac_code
173 * 4: Mask ALERT# (g763 only)
178 * Convert count value from fan controller register (FAN_SET_CNT) into fan
179 * speed RPM value. Note that the datasheet documents a basic formula;
180 * influence of additional parameters (fan clock divisor, fan gear mode)
181 * have been infered from examples in the datasheet and tests.
183 static inline unsigned int rpm_from_cnt(u8 cnt, u32 clk_freq, u16 p,
184 u8 clk_div, u8 gear_mult)
186 if (cnt == 0xff) /* setting cnt to 255 stops the fan */
189 return (clk_freq * 30 * gear_mult) / ((cnt ? cnt : 1) * p * clk_div);
193 * Convert fan RPM value from sysfs into count value for fan controller
194 * register (FAN_SET_CNT).
196 static inline unsigned char cnt_from_rpm(u32 rpm, u32 clk_freq, u16 p,
197 u8 clk_div, u8 gear_mult)
199 if (!rpm) /* to stop the fan, set cnt to 255 */
202 return clamp_val(((clk_freq * 30 * gear_mult) / (rpm * p * clk_div)),
206 /* helper to grab and cache data, at most one time per second */
207 static struct g762_data *g762_update_client(struct device *dev)
209 struct i2c_client *client = to_i2c_client(dev);
210 struct g762_data *data = i2c_get_clientdata(client);
213 mutex_lock(&data->update_lock);
214 if (time_before(jiffies, data->last_updated + G762_UPDATE_INTERVAL) &&
218 ret = i2c_smbus_read_byte_data(client, G762_REG_SET_CNT);
223 ret = i2c_smbus_read_byte_data(client, G762_REG_ACT_CNT);
228 ret = i2c_smbus_read_byte_data(client, G762_REG_FAN_STA);
233 ret = i2c_smbus_read_byte_data(client, G762_REG_SET_OUT);
238 ret = i2c_smbus_read_byte_data(client, G762_REG_FAN_CMD1);
241 data->fan_cmd1 = ret;
243 ret = i2c_smbus_read_byte_data(client, G762_REG_FAN_CMD2);
246 data->fan_cmd2 = ret;
248 data->last_updated = jiffies;
251 mutex_unlock(&data->update_lock);
253 if (ret < 0) /* upon error, encode it in return value */
259 /* helpers for writing hardware parameters */
262 * Set input clock frequency received on CLK pin of the chip. Accepted values
263 * are between 0 and 0xffffff. If zero is given, then default frequency
264 * (32,768Hz) is used. Note that clock frequency is a characteristic of the
265 * system but an internal parameter, i.e. value is not passed to the device.
267 static int do_set_clk_freq(struct device *dev, unsigned long val)
269 struct i2c_client *client = to_i2c_client(dev);
270 struct g762_data *data = i2c_get_clientdata(client);
277 data->clk_freq = val;
282 /* Set pwm mode. Accepts either 0 (PWM mode) or 1 (DC mode) */
283 static int do_set_pwm_mode(struct device *dev, unsigned long val)
285 struct i2c_client *client = to_i2c_client(dev);
286 struct g762_data *data = g762_update_client(dev);
290 return PTR_ERR(data);
292 mutex_lock(&data->update_lock);
294 case G762_OUT_MODE_PWM:
295 data->fan_cmd1 |= G762_REG_FAN_CMD1_OUT_MODE;
297 case G762_OUT_MODE_DC:
298 data->fan_cmd1 &= ~G762_REG_FAN_CMD1_OUT_MODE;
304 ret = i2c_smbus_write_byte_data(client, G762_REG_FAN_CMD1,
308 mutex_unlock(&data->update_lock);
313 /* Set fan clock divisor. Accepts either 1, 2, 4 or 8. */
314 static int do_set_fan_div(struct device *dev, unsigned long val)
316 struct i2c_client *client = to_i2c_client(dev);
317 struct g762_data *data = g762_update_client(dev);
321 return PTR_ERR(data);
323 mutex_lock(&data->update_lock);
326 data->fan_cmd1 &= ~G762_REG_FAN_CMD1_CLK_DIV_ID0;
327 data->fan_cmd1 &= ~G762_REG_FAN_CMD1_CLK_DIV_ID1;
330 data->fan_cmd1 |= G762_REG_FAN_CMD1_CLK_DIV_ID0;
331 data->fan_cmd1 &= ~G762_REG_FAN_CMD1_CLK_DIV_ID1;
334 data->fan_cmd1 &= ~G762_REG_FAN_CMD1_CLK_DIV_ID0;
335 data->fan_cmd1 |= G762_REG_FAN_CMD1_CLK_DIV_ID1;
338 data->fan_cmd1 |= G762_REG_FAN_CMD1_CLK_DIV_ID0;
339 data->fan_cmd1 |= G762_REG_FAN_CMD1_CLK_DIV_ID1;
345 ret = i2c_smbus_write_byte_data(client, G762_REG_FAN_CMD1,
349 mutex_unlock(&data->update_lock);
354 /* Set fan gear mode. Accepts either 0, 1 or 2. */
355 static int do_set_fan_gear_mode(struct device *dev, unsigned long val)
357 struct i2c_client *client = to_i2c_client(dev);
358 struct g762_data *data = g762_update_client(dev);
362 return PTR_ERR(data);
364 mutex_lock(&data->update_lock);
367 data->fan_cmd2 &= ~G762_REG_FAN_CMD2_GEAR_MODE_0;
368 data->fan_cmd2 &= ~G762_REG_FAN_CMD2_GEAR_MODE_1;
371 data->fan_cmd2 |= G762_REG_FAN_CMD2_GEAR_MODE_0;
372 data->fan_cmd2 &= ~G762_REG_FAN_CMD2_GEAR_MODE_1;
375 data->fan_cmd2 &= ~G762_REG_FAN_CMD2_GEAR_MODE_0;
376 data->fan_cmd2 |= G762_REG_FAN_CMD2_GEAR_MODE_1;
382 ret = i2c_smbus_write_byte_data(client, G762_REG_FAN_CMD2,
386 mutex_unlock(&data->update_lock);
391 /* Set number of fan pulses per revolution. Accepts either 2 or 4. */
392 static int do_set_fan_pulses(struct device *dev, unsigned long val)
394 struct i2c_client *client = to_i2c_client(dev);
395 struct g762_data *data = g762_update_client(dev);
399 return PTR_ERR(data);
401 mutex_lock(&data->update_lock);
404 data->fan_cmd1 &= ~G762_REG_FAN_CMD1_PULSE_PER_REV;
407 data->fan_cmd1 |= G762_REG_FAN_CMD1_PULSE_PER_REV;
413 ret = i2c_smbus_write_byte_data(client, G762_REG_FAN_CMD1,
417 mutex_unlock(&data->update_lock);
422 /* Set fan mode. Accepts either 1 (open-loop) or 2 (closed-loop). */
423 static int do_set_pwm_enable(struct device *dev, unsigned long val)
425 struct i2c_client *client = to_i2c_client(dev);
426 struct g762_data *data = g762_update_client(dev);
430 return PTR_ERR(data);
432 mutex_lock(&data->update_lock);
434 case G762_FAN_MODE_CLOSED_LOOP:
435 data->fan_cmd1 |= G762_REG_FAN_CMD1_FAN_MODE;
437 case G762_FAN_MODE_OPEN_LOOP:
438 data->fan_cmd1 &= ~G762_REG_FAN_CMD1_FAN_MODE;
440 * BUG FIX: if SET_CNT register value is 255 then, for some
441 * unknown reason, fan will not rotate as expected, no matter
442 * the value of SET_OUT (to be specific, this seems to happen
443 * only in PWM mode). To workaround this bug, we give SET_CNT
444 * value of 254 if it is 255 when switching to open-loop.
446 if (data->set_cnt == 0xff)
447 i2c_smbus_write_byte_data(client, G762_REG_SET_CNT,
455 ret = i2c_smbus_write_byte_data(client, G762_REG_FAN_CMD1,
459 mutex_unlock(&data->update_lock);
464 /* Set PWM polarity. Accepts either 0 (positive duty) or 1 (negative duty) */
465 static int do_set_pwm_polarity(struct device *dev, unsigned long val)
467 struct i2c_client *client = to_i2c_client(dev);
468 struct g762_data *data = g762_update_client(dev);
472 return PTR_ERR(data);
474 mutex_lock(&data->update_lock);
476 case G762_PWM_POLARITY_POSITIVE:
477 data->fan_cmd1 &= ~G762_REG_FAN_CMD1_PWM_POLARITY;
479 case G762_PWM_POLARITY_NEGATIVE:
480 data->fan_cmd1 |= G762_REG_FAN_CMD1_PWM_POLARITY;
486 ret = i2c_smbus_write_byte_data(client, G762_REG_FAN_CMD1,
490 mutex_unlock(&data->update_lock);
496 * Set pwm value. Accepts values between 0 (stops the fan) and
497 * 255 (full speed). This only makes sense in open-loop mode.
499 static int do_set_pwm(struct device *dev, unsigned long val)
501 struct i2c_client *client = to_i2c_client(dev);
502 struct g762_data *data = i2c_get_clientdata(client);
508 mutex_lock(&data->update_lock);
509 ret = i2c_smbus_write_byte_data(client, G762_REG_SET_OUT, val);
511 mutex_unlock(&data->update_lock);
517 * Set fan RPM value. Can be called both in closed and open-loop mode
518 * but effect will only be seen after closed-loop mode is configured.
520 static int do_set_fan_target(struct device *dev, unsigned long val)
522 struct i2c_client *client = to_i2c_client(dev);
523 struct g762_data *data = g762_update_client(dev);
527 return PTR_ERR(data);
529 mutex_lock(&data->update_lock);
530 data->set_cnt = cnt_from_rpm(val, data->clk_freq,
531 G762_PULSE_FROM_REG(data->fan_cmd1),
532 G762_CLKDIV_FROM_REG(data->fan_cmd1),
533 G762_GEARMULT_FROM_REG(data->fan_cmd2));
534 ret = i2c_smbus_write_byte_data(client, G762_REG_SET_CNT,
537 mutex_unlock(&data->update_lock);
542 /* Set fan startup voltage. Accepted values are either 0, 1, 2 or 3. */
543 static int do_set_fan_startv(struct device *dev, unsigned long val)
545 struct i2c_client *client = to_i2c_client(dev);
546 struct g762_data *data = g762_update_client(dev);
550 return PTR_ERR(data);
552 mutex_lock(&data->update_lock);
555 data->fan_cmd2 &= ~G762_REG_FAN_CMD2_FAN_STARTV_0;
556 data->fan_cmd2 &= ~G762_REG_FAN_CMD2_FAN_STARTV_1;
559 data->fan_cmd2 |= G762_REG_FAN_CMD2_FAN_STARTV_0;
560 data->fan_cmd2 &= ~G762_REG_FAN_CMD2_FAN_STARTV_1;
563 data->fan_cmd2 &= ~G762_REG_FAN_CMD2_FAN_STARTV_0;
564 data->fan_cmd2 |= G762_REG_FAN_CMD2_FAN_STARTV_1;
567 data->fan_cmd2 |= G762_REG_FAN_CMD2_FAN_STARTV_0;
568 data->fan_cmd2 |= G762_REG_FAN_CMD2_FAN_STARTV_1;
574 ret = i2c_smbus_write_byte_data(client, G762_REG_FAN_CMD2,
578 mutex_unlock(&data->update_lock);
584 * Helper to import hardware characteristics from .dts file and push
589 static struct of_device_id g762_dt_match[] = {
590 { .compatible = "gmt,g762" },
591 { .compatible = "gmt,g763" },
596 * Grab clock (a required property), enable it, get (fixed) clock frequency
597 * and store it. Note: upon success, clock has been prepared and enabled; it
598 * must later be unprepared and disabled (e.g. during module unloading) by a
599 * call to g762_of_clock_disable(). Note that a reference to clock is kept
600 * in our private data structure to be used in this function.
602 static int g762_of_clock_enable(struct i2c_client *client)
604 struct g762_data *data;
605 unsigned long clk_freq;
609 if (!client->dev.of_node)
612 clk = of_clk_get(client->dev.of_node, 0);
614 dev_err(&client->dev, "failed to get clock\n");
618 ret = clk_prepare_enable(clk);
620 dev_err(&client->dev, "failed to enable clock\n");
624 clk_freq = clk_get_rate(clk);
625 ret = do_set_clk_freq(&client->dev, clk_freq);
627 dev_err(&client->dev, "invalid clock freq %lu\n", clk_freq);
631 data = i2c_get_clientdata(client);
637 clk_disable_unprepare(clk);
645 static void g762_of_clock_disable(struct i2c_client *client)
647 struct g762_data *data = i2c_get_clientdata(client);
652 clk_disable_unprepare(data->clk);
656 static int g762_of_prop_import_one(struct i2c_client *client,
658 int (*psetter)(struct device *dev,
665 prop = of_get_property(client->dev.of_node, pname, &len);
666 if (!prop || len != sizeof(u32))
669 pval = be32_to_cpu(prop[0]);
670 dev_dbg(&client->dev, "found %s (%d)\n", pname, pval);
671 ret = (*psetter)(&client->dev, pval);
673 dev_err(&client->dev, "unable to set %s (%d)\n", pname, pval);
678 static int g762_of_prop_import(struct i2c_client *client)
682 if (!client->dev.of_node)
685 ret = g762_of_prop_import_one(client, "fan_gear_mode",
686 do_set_fan_gear_mode);
690 ret = g762_of_prop_import_one(client, "pwm_polarity",
691 do_set_pwm_polarity);
695 return g762_of_prop_import_one(client, "fan_startv",
700 static int g762_of_prop_import(struct i2c_client *client)
705 static int g762_of_clock_enable(struct i2c_client *client)
710 static void g762_of_clock_disable(struct i2c_client *client) { }
714 * Helper to import hardware characteristics from .dts file and push
718 static int g762_pdata_prop_import(struct i2c_client *client)
720 struct g762_platform_data *pdata = dev_get_platdata(&client->dev);
726 ret = do_set_fan_gear_mode(&client->dev, pdata->fan_gear_mode);
730 ret = do_set_pwm_polarity(&client->dev, pdata->pwm_polarity);
734 ret = do_set_fan_startv(&client->dev, pdata->fan_startv);
738 return do_set_clk_freq(&client->dev, pdata->clk_freq);
746 * Read function for fan1_input sysfs file. Return current fan RPM value, or
747 * 0 if fan is out of control.
749 static ssize_t get_fan_rpm(struct device *dev, struct device_attribute *da,
752 struct g762_data *data = g762_update_client(dev);
753 unsigned int rpm = 0;
756 return PTR_ERR(data);
758 mutex_lock(&data->update_lock);
759 /* reverse logic: fan out of control reporting is enabled low */
760 if (data->fan_sta & G762_REG_FAN_STA_OOC) {
761 rpm = rpm_from_cnt(data->act_cnt, data->clk_freq,
762 G762_PULSE_FROM_REG(data->fan_cmd1),
763 G762_CLKDIV_FROM_REG(data->fan_cmd1),
764 G762_GEARMULT_FROM_REG(data->fan_cmd2));
766 mutex_unlock(&data->update_lock);
768 return sprintf(buf, "%u\n", rpm);
772 * Read and write functions for pwm1_mode sysfs file. Get and set fan speed
773 * control mode i.e. PWM (1) or DC (0).
775 static ssize_t get_pwm_mode(struct device *dev, struct device_attribute *da,
778 struct g762_data *data = g762_update_client(dev);
781 return PTR_ERR(data);
783 return sprintf(buf, "%d\n",
784 !!(data->fan_cmd1 & G762_REG_FAN_CMD1_OUT_MODE));
787 static ssize_t set_pwm_mode(struct device *dev, struct device_attribute *da,
788 const char *buf, size_t count)
793 if (kstrtoul(buf, 10, &val))
796 ret = do_set_pwm_mode(dev, val);
804 * Read and write functions for fan1_div sysfs file. Get and set fan
805 * controller prescaler value
807 static ssize_t get_fan_div(struct device *dev,
808 struct device_attribute *da, char *buf)
810 struct g762_data *data = g762_update_client(dev);
813 return PTR_ERR(data);
815 return sprintf(buf, "%d\n", G762_CLKDIV_FROM_REG(data->fan_cmd1));
818 static ssize_t set_fan_div(struct device *dev,
819 struct device_attribute *da,
820 const char *buf, size_t count)
825 if (kstrtoul(buf, 10, &val))
828 ret = do_set_fan_div(dev, val);
836 * Read and write functions for fan1_pulses sysfs file. Get and set number
837 * of tachometer pulses per fan revolution.
839 static ssize_t get_fan_pulses(struct device *dev,
840 struct device_attribute *da, char *buf)
842 struct g762_data *data = g762_update_client(dev);
845 return PTR_ERR(data);
847 return sprintf(buf, "%d\n", G762_PULSE_FROM_REG(data->fan_cmd1));
850 static ssize_t set_fan_pulses(struct device *dev,
851 struct device_attribute *da,
852 const char *buf, size_t count)
857 if (kstrtoul(buf, 10, &val))
860 ret = do_set_fan_pulses(dev, val);
868 * Read and write functions for pwm1_enable. Get and set fan speed control mode
869 * (i.e. closed or open-loop).
871 * Following documentation about hwmon's sysfs interface, a pwm1_enable node
872 * should accept followings:
874 * 0 : no fan speed control (i.e. fan at full speed)
875 * 1 : manual fan speed control enabled (use pwm[1-*]) (open-loop)
876 * 2+: automatic fan speed control enabled (use fan[1-*]_target) (closed-loop)
878 * but we do not accept 0 as this mode is not natively supported by the chip
879 * and it is not emulated by g762 driver. -EINVAL is returned in this case.
881 static ssize_t get_pwm_enable(struct device *dev,
882 struct device_attribute *da, char *buf)
884 struct g762_data *data = g762_update_client(dev);
887 return PTR_ERR(data);
889 return sprintf(buf, "%d\n",
890 (!!(data->fan_cmd1 & G762_REG_FAN_CMD1_FAN_MODE)) + 1);
893 static ssize_t set_pwm_enable(struct device *dev,
894 struct device_attribute *da,
895 const char *buf, size_t count)
900 if (kstrtoul(buf, 10, &val))
903 ret = do_set_pwm_enable(dev, val);
911 * Read and write functions for pwm1 sysfs file. Get and set pwm value
912 * (which affects fan speed) in open-loop mode. 0 stops the fan and 255
913 * makes it run at full speed.
915 static ssize_t get_pwm(struct device *dev, struct device_attribute *da,
918 struct g762_data *data = g762_update_client(dev);
921 return PTR_ERR(data);
923 return sprintf(buf, "%d\n", data->set_out);
926 static ssize_t set_pwm(struct device *dev, struct device_attribute *da,
927 const char *buf, size_t count)
932 if (kstrtoul(buf, 10, &val))
935 ret = do_set_pwm(dev, val);
943 * Read and write function for fan1_target sysfs file. Get/set the fan speed in
944 * closed-loop mode. Speed is given as a RPM value; then the chip will regulate
945 * the fan speed using pulses from fan tachometer.
947 * Refer to rpm_from_cnt() implementation above to get info about count number
950 * Also note that due to rounding errors it is possible that you don't read
951 * back exactly the value you have set.
953 static ssize_t get_fan_target(struct device *dev, struct device_attribute *da,
956 struct g762_data *data = g762_update_client(dev);
960 return PTR_ERR(data);
962 mutex_lock(&data->update_lock);
963 rpm = rpm_from_cnt(data->set_cnt, data->clk_freq,
964 G762_PULSE_FROM_REG(data->fan_cmd1),
965 G762_CLKDIV_FROM_REG(data->fan_cmd1),
966 G762_GEARMULT_FROM_REG(data->fan_cmd2));
967 mutex_unlock(&data->update_lock);
969 return sprintf(buf, "%u\n", rpm);
972 static ssize_t set_fan_target(struct device *dev, struct device_attribute *da,
973 const char *buf, size_t count)
978 if (kstrtoul(buf, 10, &val))
981 ret = do_set_fan_target(dev, val);
988 /* read function for fan1_fault sysfs file. */
989 static ssize_t get_fan_failure(struct device *dev, struct device_attribute *da,
992 struct g762_data *data = g762_update_client(dev);
995 return PTR_ERR(data);
997 return sprintf(buf, "%u\n", !!(data->fan_sta & G762_REG_FAN_STA_FAIL));
1001 * read function for fan1_alarm sysfs file. Note that OOC condition is
1004 static ssize_t get_fan_ooc(struct device *dev, struct device_attribute *da,
1007 struct g762_data *data = g762_update_client(dev);
1010 return PTR_ERR(data);
1012 return sprintf(buf, "%u\n", !(data->fan_sta & G762_REG_FAN_STA_OOC));
1015 static DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, get_pwm, set_pwm);
1016 static DEVICE_ATTR(pwm1_mode, S_IWUSR | S_IRUGO, get_pwm_mode, set_pwm_mode);
1017 static DEVICE_ATTR(pwm1_enable, S_IWUSR | S_IRUGO,
1018 get_pwm_enable, set_pwm_enable);
1019 static DEVICE_ATTR(fan1_input, S_IRUGO, get_fan_rpm, NULL);
1020 static DEVICE_ATTR(fan1_alarm, S_IRUGO, get_fan_ooc, NULL);
1021 static DEVICE_ATTR(fan1_fault, S_IRUGO, get_fan_failure, NULL);
1022 static DEVICE_ATTR(fan1_target, S_IWUSR | S_IRUGO,
1023 get_fan_target, set_fan_target);
1024 static DEVICE_ATTR(fan1_div, S_IWUSR | S_IRUGO, get_fan_div, set_fan_div);
1025 static DEVICE_ATTR(fan1_pulses, S_IWUSR | S_IRUGO,
1026 get_fan_pulses, set_fan_pulses);
1029 static struct attribute *g762_attributes[] = {
1030 &dev_attr_fan1_input.attr,
1031 &dev_attr_fan1_alarm.attr,
1032 &dev_attr_fan1_fault.attr,
1033 &dev_attr_fan1_target.attr,
1034 &dev_attr_fan1_div.attr,
1035 &dev_attr_fan1_pulses.attr,
1036 &dev_attr_pwm1.attr,
1037 &dev_attr_pwm1_mode.attr,
1038 &dev_attr_pwm1_enable.attr,
1042 static const struct attribute_group g762_group = {
1043 .attrs = g762_attributes,
1047 * Enable both fan failure detection and fan out of control protection. The
1048 * function does not protect change/access to data structure; it must thus
1049 * only be called during initialization.
1051 static inline int g762_fan_init(struct device *dev)
1053 struct i2c_client *client = to_i2c_client(dev);
1054 struct g762_data *data = g762_update_client(dev);
1057 return PTR_ERR(data);
1059 data->fan_cmd1 |= G762_REG_FAN_CMD1_DET_FAN_FAIL;
1060 data->fan_cmd1 |= G762_REG_FAN_CMD1_DET_FAN_OOC;
1061 data->valid = false;
1063 return i2c_smbus_write_byte_data(client, G762_REG_FAN_CMD1,
1067 static int g762_probe(struct i2c_client *client, const struct i2c_device_id *id)
1069 struct g762_data *data;
1072 if (!i2c_check_functionality(client->adapter,
1073 I2C_FUNC_SMBUS_BYTE_DATA))
1076 data = devm_kzalloc(&client->dev, sizeof(struct g762_data), GFP_KERNEL);
1080 i2c_set_clientdata(client, data);
1081 data->client = client;
1082 mutex_init(&data->update_lock);
1084 /* Enable fan failure detection and fan out of control protection */
1085 ret = g762_fan_init(&client->dev);
1089 /* Get configuration via DT ... */
1090 ret = g762_of_clock_enable(client);
1093 ret = g762_of_prop_import(client);
1096 /* ... or platform_data */
1097 ret = g762_pdata_prop_import(client);
1101 /* Register sysfs hooks */
1102 ret = sysfs_create_group(&client->dev.kobj, &g762_group);
1106 data->hwmon_dev = hwmon_device_register(&client->dev);
1107 if (IS_ERR(data->hwmon_dev)) {
1108 ret = PTR_ERR(data->hwmon_dev);
1115 sysfs_remove_group(&client->dev.kobj, &g762_group);
1118 g762_of_clock_disable(client);
1123 static int g762_remove(struct i2c_client *client)
1125 struct g762_data *data = i2c_get_clientdata(client);
1127 hwmon_device_unregister(data->hwmon_dev);
1128 sysfs_remove_group(&client->dev.kobj, &g762_group);
1129 g762_of_clock_disable(client);
1134 static struct i2c_driver g762_driver = {
1137 .owner = THIS_MODULE,
1138 .of_match_table = of_match_ptr(g762_dt_match),
1140 .probe = g762_probe,
1141 .remove = g762_remove,
1142 .id_table = g762_id,
1145 module_i2c_driver(g762_driver);
1147 MODULE_AUTHOR("Arnaud EBALARD <arno@natisbad.org>");
1148 MODULE_DESCRIPTION("GMT G762/G763 driver");
1149 MODULE_LICENSE("GPL");