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1090 lines
27 KiB
1090 lines
27 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* g762 - Driver for the Global Mixed-mode Technology Inc. fan speed |
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* PWM controller chips from G762 family, i.e. G762 and G763 |
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* |
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* Copyright (C) 2013, Arnaud EBALARD <[email protected]> |
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* |
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* This work is based on a basic version for 2.6.31 kernel developed |
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* by Olivier Mouchet for LaCie. Updates and correction have been |
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* performed to run on recent kernels. Additional features, like the |
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* ability to configure various characteristics via .dts file or |
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* board init file have been added. Detailed datasheet on which this |
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* development is based is available here: |
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* |
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* http://natisbad.org/NAS/refs/GMT_EDS-762_763-080710-0.2.pdf |
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* |
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* Headers from previous developments have been kept below: |
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* |
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* Copyright (c) 2009 LaCie |
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* |
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* Author: Olivier Mouchet <[email protected]> |
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* |
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* based on g760a code written by Herbert Valerio Riedel <[email protected]> |
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* Copyright (C) 2007 Herbert Valerio Riedel <[email protected]> |
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* |
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* g762: minimal datasheet available at: |
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* http://www.gmt.com.tw/product/datasheet/EDS-762_3.pdf |
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*/ |
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|
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#include <linux/device.h> |
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#include <linux/module.h> |
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#include <linux/init.h> |
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#include <linux/jiffies.h> |
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#include <linux/i2c.h> |
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#include <linux/hwmon.h> |
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#include <linux/hwmon-sysfs.h> |
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#include <linux/err.h> |
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#include <linux/mutex.h> |
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#include <linux/kernel.h> |
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#include <linux/clk.h> |
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#include <linux/of.h> |
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#include <linux/of_device.h> |
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#include <linux/platform_data/g762.h> |
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|
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#define DRVNAME "g762" |
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|
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static const struct i2c_device_id g762_id[] = { |
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{ "g762", 0 }, |
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{ "g763", 0 }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(i2c, g762_id); |
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|
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enum g762_regs { |
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G762_REG_SET_CNT = 0x00, |
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G762_REG_ACT_CNT = 0x01, |
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G762_REG_FAN_STA = 0x02, |
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G762_REG_SET_OUT = 0x03, |
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G762_REG_FAN_CMD1 = 0x04, |
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G762_REG_FAN_CMD2 = 0x05, |
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}; |
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|
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/* Config register bits */ |
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#define G762_REG_FAN_CMD1_DET_FAN_FAIL 0x80 /* enable fan_fail signal */ |
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#define G762_REG_FAN_CMD1_DET_FAN_OOC 0x40 /* enable fan_out_of_control */ |
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#define G762_REG_FAN_CMD1_OUT_MODE 0x20 /* out mode: PWM or DC */ |
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#define G762_REG_FAN_CMD1_FAN_MODE 0x10 /* fan mode: closed/open-loop */ |
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#define G762_REG_FAN_CMD1_CLK_DIV_ID1 0x08 /* clock divisor value */ |
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#define G762_REG_FAN_CMD1_CLK_DIV_ID0 0x04 |
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#define G762_REG_FAN_CMD1_PWM_POLARITY 0x02 /* PWM polarity */ |
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#define G762_REG_FAN_CMD1_PULSE_PER_REV 0x01 /* pulse per fan revolution */ |
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|
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#define G762_REG_FAN_CMD2_GEAR_MODE_1 0x08 /* fan gear mode */ |
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#define G762_REG_FAN_CMD2_GEAR_MODE_0 0x04 |
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#define G762_REG_FAN_CMD2_FAN_STARTV_1 0x02 /* fan startup voltage */ |
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#define G762_REG_FAN_CMD2_FAN_STARTV_0 0x01 |
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|
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#define G762_REG_FAN_STA_FAIL 0x02 /* fan fail */ |
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#define G762_REG_FAN_STA_OOC 0x01 /* fan out of control */ |
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|
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/* Config register values */ |
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#define G762_OUT_MODE_PWM 1 |
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#define G762_OUT_MODE_DC 0 |
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|
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#define G762_FAN_MODE_CLOSED_LOOP 2 |
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#define G762_FAN_MODE_OPEN_LOOP 1 |
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|
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#define G762_PWM_POLARITY_NEGATIVE 1 |
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#define G762_PWM_POLARITY_POSITIVE 0 |
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|
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/* Register data is read (and cached) at most once per second. */ |
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#define G762_UPDATE_INTERVAL HZ |
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|
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/* |
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* Extract pulse count per fan revolution value (2 or 4) from given |
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* FAN_CMD1 register value. |
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*/ |
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#define G762_PULSE_FROM_REG(reg) \ |
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((((reg) & G762_REG_FAN_CMD1_PULSE_PER_REV) + 1) << 1) |
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|
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/* |
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* Extract fan clock divisor (1, 2, 4 or 8) from given FAN_CMD1 |
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* register value. |
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*/ |
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#define G762_CLKDIV_FROM_REG(reg) \ |
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(1 << (((reg) & (G762_REG_FAN_CMD1_CLK_DIV_ID0 | \ |
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G762_REG_FAN_CMD1_CLK_DIV_ID1)) >> 2)) |
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|
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/* |
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* Extract fan gear mode multiplier value (0, 2 or 4) from given |
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* FAN_CMD2 register value. |
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*/ |
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#define G762_GEARMULT_FROM_REG(reg) \ |
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(1 << (((reg) & (G762_REG_FAN_CMD2_GEAR_MODE_0 | \ |
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G762_REG_FAN_CMD2_GEAR_MODE_1)) >> 2)) |
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|
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struct g762_data { |
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struct i2c_client *client; |
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struct clk *clk; |
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|
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/* update mutex */ |
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struct mutex update_lock; |
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|
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/* board specific parameters. */ |
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u32 clk_freq; |
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|
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/* g762 register cache */ |
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bool valid; |
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unsigned long last_updated; /* in jiffies */ |
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|
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u8 set_cnt; /* controls fan rotation speed in closed-loop mode */ |
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u8 act_cnt; /* provides access to current fan RPM value */ |
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u8 fan_sta; /* bit 0: set when actual fan speed is more than |
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* 25% outside requested fan speed |
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* bit 1: set when no transition occurs on fan |
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* pin for 0.7s |
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*/ |
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u8 set_out; /* controls fan rotation speed in open-loop mode */ |
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u8 fan_cmd1; /* 0: FG_PLS_ID0 FG pulses count per revolution |
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* 0: 2 counts per revolution |
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* 1: 4 counts per revolution |
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* 1: PWM_POLARITY 1: negative_duty |
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* 0: positive_duty |
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* 2,3: [FG_CLOCK_ID0, FG_CLK_ID1] |
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* 00: Divide fan clock by 1 |
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* 01: Divide fan clock by 2 |
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* 10: Divide fan clock by 4 |
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* 11: Divide fan clock by 8 |
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* 4: FAN_MODE 1:closed-loop, 0:open-loop |
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* 5: OUT_MODE 1:PWM, 0:DC |
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* 6: DET_FAN_OOC enable "fan ooc" status |
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* 7: DET_FAN_FAIL enable "fan fail" status |
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*/ |
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u8 fan_cmd2; /* 0,1: FAN_STARTV 0,1,2,3 -> 0,32,64,96 dac_code |
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* 2,3: FG_GEAR_MODE |
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* 00: multiplier = 1 |
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* 01: multiplier = 2 |
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* 10: multiplier = 4 |
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* 4: Mask ALERT# (g763 only) |
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*/ |
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}; |
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|
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/* |
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* Convert count value from fan controller register (FAN_SET_CNT) into fan |
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* speed RPM value. Note that the datasheet documents a basic formula; |
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* influence of additional parameters (fan clock divisor, fan gear mode) |
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* have been infered from examples in the datasheet and tests. |
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*/ |
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static inline unsigned int rpm_from_cnt(u8 cnt, u32 clk_freq, u16 p, |
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u8 clk_div, u8 gear_mult) |
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{ |
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if (cnt == 0xff) /* setting cnt to 255 stops the fan */ |
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return 0; |
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|
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return (clk_freq * 30 * gear_mult) / ((cnt ? cnt : 1) * p * clk_div); |
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} |
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|
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/* |
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* Convert fan RPM value from sysfs into count value for fan controller |
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* register (FAN_SET_CNT). |
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*/ |
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static inline unsigned char cnt_from_rpm(unsigned long rpm, u32 clk_freq, u16 p, |
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u8 clk_div, u8 gear_mult) |
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{ |
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unsigned long f1 = clk_freq * 30 * gear_mult; |
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unsigned long f2 = p * clk_div; |
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|
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if (!rpm) /* to stop the fan, set cnt to 255 */ |
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return 0xff; |
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|
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rpm = clamp_val(rpm, f1 / (255 * f2), ULONG_MAX / f2); |
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return DIV_ROUND_CLOSEST(f1, rpm * f2); |
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} |
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|
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/* helper to grab and cache data, at most one time per second */ |
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static struct g762_data *g762_update_client(struct device *dev) |
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{ |
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struct g762_data *data = dev_get_drvdata(dev); |
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struct i2c_client *client = data->client; |
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int ret = 0; |
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|
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mutex_lock(&data->update_lock); |
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if (time_before(jiffies, data->last_updated + G762_UPDATE_INTERVAL) && |
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likely(data->valid)) |
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goto out; |
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|
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ret = i2c_smbus_read_byte_data(client, G762_REG_SET_CNT); |
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if (ret < 0) |
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goto out; |
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data->set_cnt = ret; |
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|
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ret = i2c_smbus_read_byte_data(client, G762_REG_ACT_CNT); |
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if (ret < 0) |
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goto out; |
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data->act_cnt = ret; |
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|
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ret = i2c_smbus_read_byte_data(client, G762_REG_FAN_STA); |
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if (ret < 0) |
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goto out; |
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data->fan_sta = ret; |
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|
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ret = i2c_smbus_read_byte_data(client, G762_REG_SET_OUT); |
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if (ret < 0) |
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goto out; |
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data->set_out = ret; |
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ret = i2c_smbus_read_byte_data(client, G762_REG_FAN_CMD1); |
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if (ret < 0) |
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goto out; |
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data->fan_cmd1 = ret; |
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|
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ret = i2c_smbus_read_byte_data(client, G762_REG_FAN_CMD2); |
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if (ret < 0) |
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goto out; |
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data->fan_cmd2 = ret; |
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|
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data->last_updated = jiffies; |
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data->valid = true; |
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out: |
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mutex_unlock(&data->update_lock); |
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|
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if (ret < 0) /* upon error, encode it in return value */ |
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data = ERR_PTR(ret); |
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|
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return data; |
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} |
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|
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/* helpers for writing hardware parameters */ |
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|
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/* |
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* Set input clock frequency received on CLK pin of the chip. Accepted values |
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* are between 0 and 0xffffff. If zero is given, then default frequency |
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* (32,768Hz) is used. Note that clock frequency is a characteristic of the |
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* system but an internal parameter, i.e. value is not passed to the device. |
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*/ |
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static int do_set_clk_freq(struct device *dev, unsigned long val) |
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{ |
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struct g762_data *data = dev_get_drvdata(dev); |
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|
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if (val > 0xffffff) |
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return -EINVAL; |
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if (!val) |
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val = 32768; |
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|
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data->clk_freq = val; |
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return 0; |
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} |
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|
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/* Set pwm mode. Accepts either 0 (PWM mode) or 1 (DC mode) */ |
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static int do_set_pwm_mode(struct device *dev, unsigned long val) |
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{ |
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struct g762_data *data = g762_update_client(dev); |
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int ret; |
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|
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if (IS_ERR(data)) |
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return PTR_ERR(data); |
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|
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mutex_lock(&data->update_lock); |
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switch (val) { |
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case G762_OUT_MODE_PWM: |
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data->fan_cmd1 |= G762_REG_FAN_CMD1_OUT_MODE; |
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break; |
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case G762_OUT_MODE_DC: |
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data->fan_cmd1 &= ~G762_REG_FAN_CMD1_OUT_MODE; |
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break; |
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default: |
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ret = -EINVAL; |
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goto out; |
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} |
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ret = i2c_smbus_write_byte_data(data->client, G762_REG_FAN_CMD1, |
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data->fan_cmd1); |
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data->valid = false; |
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out: |
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mutex_unlock(&data->update_lock); |
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|
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return ret; |
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} |
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|
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/* Set fan clock divisor. Accepts either 1, 2, 4 or 8. */ |
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static int do_set_fan_div(struct device *dev, unsigned long val) |
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{ |
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struct g762_data *data = g762_update_client(dev); |
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int ret; |
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|
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if (IS_ERR(data)) |
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return PTR_ERR(data); |
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mutex_lock(&data->update_lock); |
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switch (val) { |
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case 1: |
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data->fan_cmd1 &= ~G762_REG_FAN_CMD1_CLK_DIV_ID0; |
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data->fan_cmd1 &= ~G762_REG_FAN_CMD1_CLK_DIV_ID1; |
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break; |
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case 2: |
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data->fan_cmd1 |= G762_REG_FAN_CMD1_CLK_DIV_ID0; |
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data->fan_cmd1 &= ~G762_REG_FAN_CMD1_CLK_DIV_ID1; |
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break; |
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case 4: |
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data->fan_cmd1 &= ~G762_REG_FAN_CMD1_CLK_DIV_ID0; |
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data->fan_cmd1 |= G762_REG_FAN_CMD1_CLK_DIV_ID1; |
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break; |
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case 8: |
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data->fan_cmd1 |= G762_REG_FAN_CMD1_CLK_DIV_ID0; |
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data->fan_cmd1 |= G762_REG_FAN_CMD1_CLK_DIV_ID1; |
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break; |
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default: |
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ret = -EINVAL; |
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goto out; |
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} |
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ret = i2c_smbus_write_byte_data(data->client, G762_REG_FAN_CMD1, |
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data->fan_cmd1); |
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data->valid = false; |
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out: |
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mutex_unlock(&data->update_lock); |
|
|
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return ret; |
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} |
|
|
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/* Set fan gear mode. Accepts either 0, 1 or 2. */ |
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static int do_set_fan_gear_mode(struct device *dev, unsigned long val) |
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{ |
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struct g762_data *data = g762_update_client(dev); |
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int ret; |
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|
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if (IS_ERR(data)) |
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return PTR_ERR(data); |
|
|
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mutex_lock(&data->update_lock); |
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switch (val) { |
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case 0: |
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data->fan_cmd2 &= ~G762_REG_FAN_CMD2_GEAR_MODE_0; |
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data->fan_cmd2 &= ~G762_REG_FAN_CMD2_GEAR_MODE_1; |
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break; |
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case 1: |
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data->fan_cmd2 |= G762_REG_FAN_CMD2_GEAR_MODE_0; |
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data->fan_cmd2 &= ~G762_REG_FAN_CMD2_GEAR_MODE_1; |
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break; |
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case 2: |
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data->fan_cmd2 &= ~G762_REG_FAN_CMD2_GEAR_MODE_0; |
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data->fan_cmd2 |= G762_REG_FAN_CMD2_GEAR_MODE_1; |
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break; |
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default: |
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ret = -EINVAL; |
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goto out; |
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} |
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ret = i2c_smbus_write_byte_data(data->client, G762_REG_FAN_CMD2, |
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data->fan_cmd2); |
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data->valid = false; |
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out: |
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mutex_unlock(&data->update_lock); |
|
|
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return ret; |
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} |
|
|
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/* Set number of fan pulses per revolution. Accepts either 2 or 4. */ |
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static int do_set_fan_pulses(struct device *dev, unsigned long val) |
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{ |
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struct g762_data *data = g762_update_client(dev); |
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int ret; |
|
|
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if (IS_ERR(data)) |
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return PTR_ERR(data); |
|
|
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mutex_lock(&data->update_lock); |
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switch (val) { |
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case 2: |
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data->fan_cmd1 &= ~G762_REG_FAN_CMD1_PULSE_PER_REV; |
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break; |
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case 4: |
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data->fan_cmd1 |= G762_REG_FAN_CMD1_PULSE_PER_REV; |
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break; |
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default: |
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ret = -EINVAL; |
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goto out; |
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} |
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ret = i2c_smbus_write_byte_data(data->client, G762_REG_FAN_CMD1, |
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data->fan_cmd1); |
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data->valid = false; |
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out: |
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mutex_unlock(&data->update_lock); |
|
|
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return ret; |
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} |
|
|
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/* Set fan mode. Accepts either 1 (open-loop) or 2 (closed-loop). */ |
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static int do_set_pwm_enable(struct device *dev, unsigned long val) |
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{ |
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struct g762_data *data = g762_update_client(dev); |
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int ret; |
|
|
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if (IS_ERR(data)) |
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return PTR_ERR(data); |
|
|
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mutex_lock(&data->update_lock); |
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switch (val) { |
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case G762_FAN_MODE_CLOSED_LOOP: |
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data->fan_cmd1 |= G762_REG_FAN_CMD1_FAN_MODE; |
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break; |
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case G762_FAN_MODE_OPEN_LOOP: |
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data->fan_cmd1 &= ~G762_REG_FAN_CMD1_FAN_MODE; |
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/* |
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* BUG FIX: if SET_CNT register value is 255 then, for some |
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* unknown reason, fan will not rotate as expected, no matter |
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* the value of SET_OUT (to be specific, this seems to happen |
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* only in PWM mode). To workaround this bug, we give SET_CNT |
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* value of 254 if it is 255 when switching to open-loop. |
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*/ |
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if (data->set_cnt == 0xff) |
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i2c_smbus_write_byte_data(data->client, |
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G762_REG_SET_CNT, 254); |
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break; |
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default: |
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ret = -EINVAL; |
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goto out; |
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} |
|
|
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ret = i2c_smbus_write_byte_data(data->client, G762_REG_FAN_CMD1, |
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data->fan_cmd1); |
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data->valid = false; |
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out: |
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mutex_unlock(&data->update_lock); |
|
|
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return ret; |
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} |
|
|
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/* Set PWM polarity. Accepts either 0 (positive duty) or 1 (negative duty) */ |
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static int do_set_pwm_polarity(struct device *dev, unsigned long val) |
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{ |
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struct g762_data *data = g762_update_client(dev); |
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int ret; |
|
|
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if (IS_ERR(data)) |
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return PTR_ERR(data); |
|
|
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mutex_lock(&data->update_lock); |
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switch (val) { |
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case G762_PWM_POLARITY_POSITIVE: |
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data->fan_cmd1 &= ~G762_REG_FAN_CMD1_PWM_POLARITY; |
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break; |
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case G762_PWM_POLARITY_NEGATIVE: |
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data->fan_cmd1 |= G762_REG_FAN_CMD1_PWM_POLARITY; |
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break; |
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default: |
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ret = -EINVAL; |
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goto out; |
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} |
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ret = i2c_smbus_write_byte_data(data->client, G762_REG_FAN_CMD1, |
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data->fan_cmd1); |
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data->valid = false; |
|
out: |
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mutex_unlock(&data->update_lock); |
|
|
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return ret; |
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} |
|
|
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/* |
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* Set pwm value. Accepts values between 0 (stops the fan) and |
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* 255 (full speed). This only makes sense in open-loop mode. |
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*/ |
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static int do_set_pwm(struct device *dev, unsigned long val) |
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{ |
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struct g762_data *data = dev_get_drvdata(dev); |
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struct i2c_client *client = data->client; |
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int ret; |
|
|
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if (val > 255) |
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return -EINVAL; |
|
|
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mutex_lock(&data->update_lock); |
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ret = i2c_smbus_write_byte_data(client, G762_REG_SET_OUT, val); |
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data->valid = false; |
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mutex_unlock(&data->update_lock); |
|
|
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return ret; |
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} |
|
|
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/* |
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* Set fan RPM value. Can be called both in closed and open-loop mode |
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* but effect will only be seen after closed-loop mode is configured. |
|
*/ |
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static int do_set_fan_target(struct device *dev, unsigned long val) |
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{ |
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struct g762_data *data = g762_update_client(dev); |
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int ret; |
|
|
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if (IS_ERR(data)) |
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return PTR_ERR(data); |
|
|
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mutex_lock(&data->update_lock); |
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data->set_cnt = cnt_from_rpm(val, data->clk_freq, |
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G762_PULSE_FROM_REG(data->fan_cmd1), |
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G762_CLKDIV_FROM_REG(data->fan_cmd1), |
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G762_GEARMULT_FROM_REG(data->fan_cmd2)); |
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ret = i2c_smbus_write_byte_data(data->client, G762_REG_SET_CNT, |
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data->set_cnt); |
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data->valid = false; |
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mutex_unlock(&data->update_lock); |
|
|
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return ret; |
|
} |
|
|
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/* Set fan startup voltage. Accepted values are either 0, 1, 2 or 3. */ |
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static int do_set_fan_startv(struct device *dev, unsigned long val) |
|
{ |
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struct g762_data *data = g762_update_client(dev); |
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int ret; |
|
|
|
if (IS_ERR(data)) |
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return PTR_ERR(data); |
|
|
|
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; |
|
} |
|
ret = i2c_smbus_write_byte_data(data->client, G762_REG_FAN_CMD2, |
|
data->fan_cmd2); |
|
data->valid = false; |
|
out: |
|
mutex_unlock(&data->update_lock); |
|
|
|
return ret; |
|
} |
|
|
|
/* |
|
* Helper to import hardware characteristics from .dts file and push |
|
* those to the chip. |
|
*/ |
|
|
|
#ifdef CONFIG_OF |
|
static const struct of_device_id g762_dt_match[] = { |
|
{ .compatible = "gmt,g762" }, |
|
{ .compatible = "gmt,g763" }, |
|
{ }, |
|
}; |
|
MODULE_DEVICE_TABLE(of, g762_dt_match); |
|
|
|
/* |
|
* Grab clock (a required property), enable it, get (fixed) clock frequency |
|
* and store it. Note: upon success, clock has been prepared and enabled; it |
|
* must later be unprepared and disabled (e.g. during module unloading) by a |
|
* call to g762_of_clock_disable(). Note that a reference to clock is kept |
|
* in our private data structure to be used in this function. |
|
*/ |
|
static void g762_of_clock_disable(void *data) |
|
{ |
|
struct g762_data *g762 = data; |
|
|
|
clk_disable_unprepare(g762->clk); |
|
clk_put(g762->clk); |
|
} |
|
|
|
static int g762_of_clock_enable(struct i2c_client *client) |
|
{ |
|
struct g762_data *data; |
|
unsigned long clk_freq; |
|
struct clk *clk; |
|
int ret; |
|
|
|
if (!client->dev.of_node) |
|
return 0; |
|
|
|
clk = of_clk_get(client->dev.of_node, 0); |
|
if (IS_ERR(clk)) { |
|
dev_err(&client->dev, "failed to get clock\n"); |
|
return PTR_ERR(clk); |
|
} |
|
|
|
ret = clk_prepare_enable(clk); |
|
if (ret) { |
|
dev_err(&client->dev, "failed to enable clock\n"); |
|
goto clk_put; |
|
} |
|
|
|
clk_freq = clk_get_rate(clk); |
|
ret = do_set_clk_freq(&client->dev, clk_freq); |
|
if (ret) { |
|
dev_err(&client->dev, "invalid clock freq %lu\n", clk_freq); |
|
goto clk_unprep; |
|
} |
|
|
|
data = i2c_get_clientdata(client); |
|
data->clk = clk; |
|
|
|
devm_add_action(&client->dev, g762_of_clock_disable, data); |
|
return 0; |
|
|
|
clk_unprep: |
|
clk_disable_unprepare(clk); |
|
|
|
clk_put: |
|
clk_put(clk); |
|
|
|
return ret; |
|
} |
|
|
|
static int g762_of_prop_import_one(struct i2c_client *client, |
|
const char *pname, |
|
int (*psetter)(struct device *dev, |
|
unsigned long val)) |
|
{ |
|
int ret; |
|
u32 pval; |
|
|
|
if (of_property_read_u32(client->dev.of_node, pname, &pval)) |
|
return 0; |
|
|
|
dev_dbg(&client->dev, "found %s (%d)\n", pname, pval); |
|
ret = (*psetter)(&client->dev, pval); |
|
if (ret) |
|
dev_err(&client->dev, "unable to set %s (%d)\n", pname, pval); |
|
|
|
return ret; |
|
} |
|
|
|
static int g762_of_prop_import(struct i2c_client *client) |
|
{ |
|
int ret; |
|
|
|
if (!client->dev.of_node) |
|
return 0; |
|
|
|
ret = g762_of_prop_import_one(client, "fan_gear_mode", |
|
do_set_fan_gear_mode); |
|
if (ret) |
|
return ret; |
|
|
|
ret = g762_of_prop_import_one(client, "pwm_polarity", |
|
do_set_pwm_polarity); |
|
if (ret) |
|
return ret; |
|
|
|
return g762_of_prop_import_one(client, "fan_startv", |
|
do_set_fan_startv); |
|
} |
|
|
|
#else |
|
static int g762_of_prop_import(struct i2c_client *client) |
|
{ |
|
return 0; |
|
} |
|
|
|
static int g762_of_clock_enable(struct i2c_client *client) |
|
{ |
|
return 0; |
|
} |
|
#endif |
|
|
|
/* |
|
* Helper to import hardware characteristics from .dts file and push |
|
* those to the chip. |
|
*/ |
|
|
|
static int g762_pdata_prop_import(struct i2c_client *client) |
|
{ |
|
struct g762_platform_data *pdata = dev_get_platdata(&client->dev); |
|
int ret; |
|
|
|
if (!pdata) |
|
return 0; |
|
|
|
ret = do_set_fan_gear_mode(&client->dev, pdata->fan_gear_mode); |
|
if (ret) |
|
return ret; |
|
|
|
ret = do_set_pwm_polarity(&client->dev, pdata->pwm_polarity); |
|
if (ret) |
|
return ret; |
|
|
|
ret = do_set_fan_startv(&client->dev, pdata->fan_startv); |
|
if (ret) |
|
return ret; |
|
|
|
return do_set_clk_freq(&client->dev, pdata->clk_freq); |
|
} |
|
|
|
/* |
|
* 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 fan1_input_show(struct device *dev, |
|
struct device_attribute *da, char *buf) |
|
{ |
|
struct g762_data *data = g762_update_client(dev); |
|
unsigned int rpm = 0; |
|
|
|
if (IS_ERR(data)) |
|
return PTR_ERR(data); |
|
|
|
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_freq, |
|
G762_PULSE_FROM_REG(data->fan_cmd1), |
|
G762_CLKDIV_FROM_REG(data->fan_cmd1), |
|
G762_GEARMULT_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 DC (0). |
|
*/ |
|
static ssize_t pwm1_mode_show(struct device *dev, struct device_attribute *da, |
|
char *buf) |
|
{ |
|
struct g762_data *data = g762_update_client(dev); |
|
|
|
if (IS_ERR(data)) |
|
return PTR_ERR(data); |
|
|
|
return sprintf(buf, "%d\n", |
|
!!(data->fan_cmd1 & G762_REG_FAN_CMD1_OUT_MODE)); |
|
} |
|
|
|
static ssize_t pwm1_mode_store(struct device *dev, |
|
struct device_attribute *da, const char *buf, |
|
size_t count) |
|
{ |
|
unsigned long val; |
|
int ret; |
|
|
|
if (kstrtoul(buf, 10, &val)) |
|
return -EINVAL; |
|
|
|
ret = do_set_pwm_mode(dev, val); |
|
if (ret < 0) |
|
return ret; |
|
|
|
return count; |
|
} |
|
|
|
/* |
|
* Read and write functions for fan1_div sysfs file. Get and set fan |
|
* controller prescaler value |
|
*/ |
|
static ssize_t fan1_div_show(struct device *dev, struct device_attribute *da, |
|
char *buf) |
|
{ |
|
struct g762_data *data = g762_update_client(dev); |
|
|
|
if (IS_ERR(data)) |
|
return PTR_ERR(data); |
|
|
|
return sprintf(buf, "%d\n", G762_CLKDIV_FROM_REG(data->fan_cmd1)); |
|
} |
|
|
|
static ssize_t fan1_div_store(struct device *dev, struct device_attribute *da, |
|
const char *buf, size_t count) |
|
{ |
|
unsigned long val; |
|
int ret; |
|
|
|
if (kstrtoul(buf, 10, &val)) |
|
return -EINVAL; |
|
|
|
ret = do_set_fan_div(dev, val); |
|
if (ret < 0) |
|
return ret; |
|
|
|
return count; |
|
} |
|
|
|
/* |
|
* Read and write functions for fan1_pulses sysfs file. Get and set number |
|
* of tachometer pulses per fan revolution. |
|
*/ |
|
static ssize_t fan1_pulses_show(struct device *dev, |
|
struct device_attribute *da, char *buf) |
|
{ |
|
struct g762_data *data = g762_update_client(dev); |
|
|
|
if (IS_ERR(data)) |
|
return PTR_ERR(data); |
|
|
|
return sprintf(buf, "%d\n", G762_PULSE_FROM_REG(data->fan_cmd1)); |
|
} |
|
|
|
static ssize_t fan1_pulses_store(struct device *dev, |
|
struct device_attribute *da, const char *buf, |
|
size_t count) |
|
{ |
|
unsigned long val; |
|
int ret; |
|
|
|
if (kstrtoul(buf, 10, &val)) |
|
return -EINVAL; |
|
|
|
ret = do_set_fan_pulses(dev, val); |
|
if (ret < 0) |
|
return ret; |
|
|
|
return count; |
|
} |
|
|
|
/* |
|
* Read and write functions for pwm1_enable. Get and set fan speed control mode |
|
* (i.e. closed or open-loop). |
|
* |
|
* Following documentation about hwmon's sysfs interface, a pwm1_enable node |
|
* should accept the following: |
|
* |
|
* 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-*]_target) (closed-loop) |
|
* |
|
* but we do not accept 0 as this mode is not natively supported by the chip |
|
* and it is not emulated by g762 driver. -EINVAL is returned in this case. |
|
*/ |
|
static ssize_t pwm1_enable_show(struct device *dev, |
|
struct device_attribute *da, char *buf) |
|
{ |
|
struct g762_data *data = g762_update_client(dev); |
|
|
|
if (IS_ERR(data)) |
|
return PTR_ERR(data); |
|
|
|
return sprintf(buf, "%d\n", |
|
(!!(data->fan_cmd1 & G762_REG_FAN_CMD1_FAN_MODE)) + 1); |
|
} |
|
|
|
static ssize_t pwm1_enable_store(struct device *dev, |
|
struct device_attribute *da, const char *buf, |
|
size_t count) |
|
{ |
|
unsigned long val; |
|
int ret; |
|
|
|
if (kstrtoul(buf, 10, &val)) |
|
return -EINVAL; |
|
|
|
ret = do_set_pwm_enable(dev, val); |
|
if (ret < 0) |
|
return ret; |
|
|
|
return count; |
|
} |
|
|
|
/* |
|
* Read and write functions for pwm1 sysfs file. Get and set pwm value |
|
* (which affects fan speed) in open-loop mode. 0 stops the fan and 255 |
|
* makes it run at full speed. |
|
*/ |
|
static ssize_t pwm1_show(struct device *dev, struct device_attribute *da, |
|
char *buf) |
|
{ |
|
struct g762_data *data = g762_update_client(dev); |
|
|
|
if (IS_ERR(data)) |
|
return PTR_ERR(data); |
|
|
|
return sprintf(buf, "%d\n", data->set_out); |
|
} |
|
|
|
static ssize_t pwm1_store(struct device *dev, struct device_attribute *da, |
|
const char *buf, size_t count) |
|
{ |
|
unsigned long val; |
|
int ret; |
|
|
|
if (kstrtoul(buf, 10, &val)) |
|
return -EINVAL; |
|
|
|
ret = do_set_pwm(dev, val); |
|
if (ret < 0) |
|
return ret; |
|
|
|
return count; |
|
} |
|
|
|
/* |
|
* Read and write function for fan1_target sysfs file. Get/set the fan speed in |
|
* closed-loop mode. Speed is given as a RPM value; then the chip will regulate |
|
* the fan speed using pulses from fan tachometer. |
|
* |
|
* Refer to rpm_from_cnt() implementation above 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 fan1_target_show(struct device *dev, |
|
struct device_attribute *da, char *buf) |
|
{ |
|
struct g762_data *data = g762_update_client(dev); |
|
unsigned int rpm; |
|
|
|
if (IS_ERR(data)) |
|
return PTR_ERR(data); |
|
|
|
mutex_lock(&data->update_lock); |
|
rpm = rpm_from_cnt(data->set_cnt, data->clk_freq, |
|
G762_PULSE_FROM_REG(data->fan_cmd1), |
|
G762_CLKDIV_FROM_REG(data->fan_cmd1), |
|
G762_GEARMULT_FROM_REG(data->fan_cmd2)); |
|
mutex_unlock(&data->update_lock); |
|
|
|
return sprintf(buf, "%u\n", rpm); |
|
} |
|
|
|
static ssize_t fan1_target_store(struct device *dev, |
|
struct device_attribute *da, const char *buf, |
|
size_t count) |
|
{ |
|
unsigned long val; |
|
int ret; |
|
|
|
if (kstrtoul(buf, 10, &val)) |
|
return -EINVAL; |
|
|
|
ret = do_set_fan_target(dev, val); |
|
if (ret < 0) |
|
return ret; |
|
|
|
return count; |
|
} |
|
|
|
/* read function for fan1_fault sysfs file. */ |
|
static ssize_t fan1_fault_show(struct device *dev, struct device_attribute *da, |
|
char *buf) |
|
{ |
|
struct g762_data *data = g762_update_client(dev); |
|
|
|
if (IS_ERR(data)) |
|
return PTR_ERR(data); |
|
|
|
return sprintf(buf, "%u\n", !!(data->fan_sta & G762_REG_FAN_STA_FAIL)); |
|
} |
|
|
|
/* |
|
* read function for fan1_alarm sysfs file. Note that OOC condition is |
|
* enabled low |
|
*/ |
|
static ssize_t fan1_alarm_show(struct device *dev, |
|
struct device_attribute *da, char *buf) |
|
{ |
|
struct g762_data *data = g762_update_client(dev); |
|
|
|
if (IS_ERR(data)) |
|
return PTR_ERR(data); |
|
|
|
return sprintf(buf, "%u\n", !(data->fan_sta & G762_REG_FAN_STA_OOC)); |
|
} |
|
|
|
static DEVICE_ATTR_RW(pwm1); |
|
static DEVICE_ATTR_RW(pwm1_mode); |
|
static DEVICE_ATTR_RW(pwm1_enable); |
|
static DEVICE_ATTR_RO(fan1_input); |
|
static DEVICE_ATTR_RO(fan1_alarm); |
|
static DEVICE_ATTR_RO(fan1_fault); |
|
static DEVICE_ATTR_RW(fan1_target); |
|
static DEVICE_ATTR_RW(fan1_div); |
|
static DEVICE_ATTR_RW(fan1_pulses); |
|
|
|
/* Driver data */ |
|
static struct attribute *g762_attrs[] = { |
|
&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_fan1_pulses.attr, |
|
&dev_attr_pwm1.attr, |
|
&dev_attr_pwm1_mode.attr, |
|
&dev_attr_pwm1_enable.attr, |
|
NULL |
|
}; |
|
|
|
ATTRIBUTE_GROUPS(g762); |
|
|
|
/* |
|
* Enable both fan failure detection and fan out of control protection. The |
|
* function does not protect change/access to data structure; it must thus |
|
* only be called during initialization. |
|
*/ |
|
static inline int g762_fan_init(struct device *dev) |
|
{ |
|
struct g762_data *data = g762_update_client(dev); |
|
|
|
if (IS_ERR(data)) |
|
return PTR_ERR(data); |
|
|
|
data->fan_cmd1 |= G762_REG_FAN_CMD1_DET_FAN_FAIL; |
|
data->fan_cmd1 |= G762_REG_FAN_CMD1_DET_FAN_OOC; |
|
data->valid = false; |
|
|
|
return i2c_smbus_write_byte_data(data->client, G762_REG_FAN_CMD1, |
|
data->fan_cmd1); |
|
} |
|
|
|
static int g762_probe(struct i2c_client *client) |
|
{ |
|
struct device *dev = &client->dev; |
|
struct device *hwmon_dev; |
|
struct g762_data *data; |
|
int ret; |
|
|
|
if (!i2c_check_functionality(client->adapter, |
|
I2C_FUNC_SMBUS_BYTE_DATA)) |
|
return -ENODEV; |
|
|
|
data = devm_kzalloc(dev, sizeof(struct g762_data), GFP_KERNEL); |
|
if (!data) |
|
return -ENOMEM; |
|
|
|
i2c_set_clientdata(client, data); |
|
data->client = client; |
|
mutex_init(&data->update_lock); |
|
|
|
/* Enable fan failure detection and fan out of control protection */ |
|
ret = g762_fan_init(dev); |
|
if (ret) |
|
return ret; |
|
|
|
/* Get configuration via DT ... */ |
|
ret = g762_of_clock_enable(client); |
|
if (ret) |
|
return ret; |
|
ret = g762_of_prop_import(client); |
|
if (ret) |
|
return ret; |
|
/* ... or platform_data */ |
|
ret = g762_pdata_prop_import(client); |
|
if (ret) |
|
return ret; |
|
|
|
hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, |
|
data, g762_groups); |
|
return PTR_ERR_OR_ZERO(hwmon_dev); |
|
} |
|
|
|
static struct i2c_driver g762_driver = { |
|
.driver = { |
|
.name = DRVNAME, |
|
.of_match_table = of_match_ptr(g762_dt_match), |
|
}, |
|
.probe_new = g762_probe, |
|
.id_table = g762_id, |
|
}; |
|
|
|
module_i2c_driver(g762_driver); |
|
|
|
MODULE_AUTHOR("Arnaud EBALARD <[email protected]>"); |
|
MODULE_DESCRIPTION("GMT G762/G763 driver"); |
|
MODULE_LICENSE("GPL");
|
|
|