1*594fbe71SArnaud Ebalard /* 2*594fbe71SArnaud Ebalard * g762 - Driver for the Global Mixed-mode Technology Inc. fan speed 3*594fbe71SArnaud Ebalard * PWM controller chips from G762 family, i.e. G762 and G763 4*594fbe71SArnaud Ebalard * 5*594fbe71SArnaud Ebalard * Copyright (C) 2013, Arnaud EBALARD <arno@natisbad.org> 6*594fbe71SArnaud Ebalard * 7*594fbe71SArnaud Ebalard * This work is based on a basic version for 2.6.31 kernel developed 8*594fbe71SArnaud Ebalard * by Olivier Mouchet for LaCie. Updates and correction have been 9*594fbe71SArnaud Ebalard * performed to run on recent kernels. Additional features, like the 10*594fbe71SArnaud Ebalard * ability to configure various characteristics via .dts file or 11*594fbe71SArnaud Ebalard * board init file have been added. Detailed datasheet on which this 12*594fbe71SArnaud Ebalard * development is based is available here: 13*594fbe71SArnaud Ebalard * 14*594fbe71SArnaud Ebalard * http://natisbad.org/NAS/refs/GMT_EDS-762_763-080710-0.2.pdf 15*594fbe71SArnaud Ebalard * 16*594fbe71SArnaud Ebalard * Headers from previous developments have been kept below: 17*594fbe71SArnaud Ebalard * 18*594fbe71SArnaud Ebalard * Copyright (c) 2009 LaCie 19*594fbe71SArnaud Ebalard * 20*594fbe71SArnaud Ebalard * Author: Olivier Mouchet <olivier.mouchet@gmail.com> 21*594fbe71SArnaud Ebalard * 22*594fbe71SArnaud Ebalard * based on g760a code written by Herbert Valerio Riedel <hvr@gnu.org> 23*594fbe71SArnaud Ebalard * Copyright (C) 2007 Herbert Valerio Riedel <hvr@gnu.org> 24*594fbe71SArnaud Ebalard * 25*594fbe71SArnaud Ebalard * g762: minimal datasheet available at: 26*594fbe71SArnaud Ebalard * http://www.gmt.com.tw/product/datasheet/EDS-762_3.pdf 27*594fbe71SArnaud Ebalard * 28*594fbe71SArnaud Ebalard * This program is free software; you can redistribute it and/or modify 29*594fbe71SArnaud Ebalard * it under the terms of the GNU General Public License as published by 30*594fbe71SArnaud Ebalard * the Free Software Foundation; either version 2 of the License, or 31*594fbe71SArnaud Ebalard * (at your option) any later version. 32*594fbe71SArnaud Ebalard * 33*594fbe71SArnaud Ebalard * This program is distributed in the hope that it will be useful, 34*594fbe71SArnaud Ebalard * but WITHOUT ANY WARRANTY; without even the implied warranty of 35*594fbe71SArnaud Ebalard * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 36*594fbe71SArnaud Ebalard * GNU General Public License for more details. 37*594fbe71SArnaud Ebalard * 38*594fbe71SArnaud Ebalard * You should have received a copy of the GNU General Public License 39*594fbe71SArnaud Ebalard * along with this program; if not, write to the Free Software 40*594fbe71SArnaud Ebalard * Foundation. 41*594fbe71SArnaud Ebalard */ 42*594fbe71SArnaud Ebalard 43*594fbe71SArnaud Ebalard #include <linux/device.h> 44*594fbe71SArnaud Ebalard #include <linux/module.h> 45*594fbe71SArnaud Ebalard #include <linux/init.h> 46*594fbe71SArnaud Ebalard #include <linux/jiffies.h> 47*594fbe71SArnaud Ebalard #include <linux/i2c.h> 48*594fbe71SArnaud Ebalard #include <linux/hwmon.h> 49*594fbe71SArnaud Ebalard #include <linux/hwmon-sysfs.h> 50*594fbe71SArnaud Ebalard #include <linux/err.h> 51*594fbe71SArnaud Ebalard #include <linux/mutex.h> 52*594fbe71SArnaud Ebalard #include <linux/kernel.h> 53*594fbe71SArnaud Ebalard #include <linux/clk.h> 54*594fbe71SArnaud Ebalard #include <linux/of.h> 55*594fbe71SArnaud Ebalard #include <linux/of_device.h> 56*594fbe71SArnaud Ebalard #include <linux/platform_data/g762.h> 57*594fbe71SArnaud Ebalard 58*594fbe71SArnaud Ebalard #define DRVNAME "g762" 59*594fbe71SArnaud Ebalard 60*594fbe71SArnaud Ebalard static const struct i2c_device_id g762_id[] = { 61*594fbe71SArnaud Ebalard { "g762", 0 }, 62*594fbe71SArnaud Ebalard { "g763", 0 }, 63*594fbe71SArnaud Ebalard { } 64*594fbe71SArnaud Ebalard }; 65*594fbe71SArnaud Ebalard MODULE_DEVICE_TABLE(i2c, g762_id); 66*594fbe71SArnaud Ebalard 67*594fbe71SArnaud Ebalard enum g762_regs { 68*594fbe71SArnaud Ebalard G762_REG_SET_CNT = 0x00, 69*594fbe71SArnaud Ebalard G762_REG_ACT_CNT = 0x01, 70*594fbe71SArnaud Ebalard G762_REG_FAN_STA = 0x02, 71*594fbe71SArnaud Ebalard G762_REG_SET_OUT = 0x03, 72*594fbe71SArnaud Ebalard G762_REG_FAN_CMD1 = 0x04, 73*594fbe71SArnaud Ebalard G762_REG_FAN_CMD2 = 0x05, 74*594fbe71SArnaud Ebalard }; 75*594fbe71SArnaud Ebalard 76*594fbe71SArnaud Ebalard /* Config register bits */ 77*594fbe71SArnaud Ebalard #define G762_REG_FAN_CMD1_DET_FAN_FAIL 0x80 /* enable fan_fail signal */ 78*594fbe71SArnaud Ebalard #define G762_REG_FAN_CMD1_DET_FAN_OOC 0x40 /* enable fan_out_of_control */ 79*594fbe71SArnaud Ebalard #define G762_REG_FAN_CMD1_OUT_MODE 0x20 /* out mode: PWM or DC */ 80*594fbe71SArnaud Ebalard #define G762_REG_FAN_CMD1_FAN_MODE 0x10 /* fan mode: closed/open-loop */ 81*594fbe71SArnaud Ebalard #define G762_REG_FAN_CMD1_CLK_DIV_ID1 0x08 /* clock divisor value */ 82*594fbe71SArnaud Ebalard #define G762_REG_FAN_CMD1_CLK_DIV_ID0 0x04 83*594fbe71SArnaud Ebalard #define G762_REG_FAN_CMD1_PWM_POLARITY 0x02 /* PWM polarity */ 84*594fbe71SArnaud Ebalard #define G762_REG_FAN_CMD1_PULSE_PER_REV 0x01 /* pulse per fan revolution */ 85*594fbe71SArnaud Ebalard 86*594fbe71SArnaud Ebalard #define G762_REG_FAN_CMD2_GEAR_MODE_1 0x08 /* fan gear mode */ 87*594fbe71SArnaud Ebalard #define G762_REG_FAN_CMD2_GEAR_MODE_0 0x04 88*594fbe71SArnaud Ebalard #define G762_REG_FAN_CMD2_FAN_STARTV_1 0x02 /* fan startup voltage */ 89*594fbe71SArnaud Ebalard #define G762_REG_FAN_CMD2_FAN_STARTV_0 0x01 90*594fbe71SArnaud Ebalard 91*594fbe71SArnaud Ebalard #define G762_REG_FAN_STA_FAIL 0x02 /* fan fail */ 92*594fbe71SArnaud Ebalard #define G762_REG_FAN_STA_OOC 0x01 /* fan out of control */ 93*594fbe71SArnaud Ebalard 94*594fbe71SArnaud Ebalard /* Config register values */ 95*594fbe71SArnaud Ebalard #define G762_OUT_MODE_PWM 1 96*594fbe71SArnaud Ebalard #define G762_OUT_MODE_DC 0 97*594fbe71SArnaud Ebalard 98*594fbe71SArnaud Ebalard #define G762_FAN_MODE_CLOSED_LOOP 2 99*594fbe71SArnaud Ebalard #define G762_FAN_MODE_OPEN_LOOP 1 100*594fbe71SArnaud Ebalard 101*594fbe71SArnaud Ebalard #define G762_PWM_POLARITY_NEGATIVE 1 102*594fbe71SArnaud Ebalard #define G762_PWM_POLARITY_POSITIVE 0 103*594fbe71SArnaud Ebalard 104*594fbe71SArnaud Ebalard /* Register data is read (and cached) at most once per second. */ 105*594fbe71SArnaud Ebalard #define G762_UPDATE_INTERVAL HZ 106*594fbe71SArnaud Ebalard 107*594fbe71SArnaud Ebalard /* 108*594fbe71SArnaud Ebalard * Extract pulse count per fan revolution value (2 or 4) from given 109*594fbe71SArnaud Ebalard * FAN_CMD1 register value. 110*594fbe71SArnaud Ebalard */ 111*594fbe71SArnaud Ebalard #define G762_PULSE_FROM_REG(reg) \ 112*594fbe71SArnaud Ebalard ((((reg) & G762_REG_FAN_CMD1_PULSE_PER_REV) + 1) << 1) 113*594fbe71SArnaud Ebalard 114*594fbe71SArnaud Ebalard /* 115*594fbe71SArnaud Ebalard * Extract fan clock divisor (1, 2, 4 or 8) from given FAN_CMD1 116*594fbe71SArnaud Ebalard * register value. 117*594fbe71SArnaud Ebalard */ 118*594fbe71SArnaud Ebalard #define G762_CLKDIV_FROM_REG(reg) \ 119*594fbe71SArnaud Ebalard (1 << (((reg) & (G762_REG_FAN_CMD1_CLK_DIV_ID0 | \ 120*594fbe71SArnaud Ebalard G762_REG_FAN_CMD1_CLK_DIV_ID1)) >> 2)) 121*594fbe71SArnaud Ebalard 122*594fbe71SArnaud Ebalard /* 123*594fbe71SArnaud Ebalard * Extract fan gear mode multiplier value (0, 2 or 4) from given 124*594fbe71SArnaud Ebalard * FAN_CMD2 register value. 125*594fbe71SArnaud Ebalard */ 126*594fbe71SArnaud Ebalard #define G762_GEARMULT_FROM_REG(reg) \ 127*594fbe71SArnaud Ebalard (1 << (((reg) & (G762_REG_FAN_CMD2_GEAR_MODE_0 | \ 128*594fbe71SArnaud Ebalard G762_REG_FAN_CMD2_GEAR_MODE_1)) >> 2)) 129*594fbe71SArnaud Ebalard 130*594fbe71SArnaud Ebalard struct g762_data { 131*594fbe71SArnaud Ebalard struct i2c_client *client; 132*594fbe71SArnaud Ebalard struct device *hwmon_dev; 133*594fbe71SArnaud Ebalard struct clk *clk; 134*594fbe71SArnaud Ebalard 135*594fbe71SArnaud Ebalard /* update mutex */ 136*594fbe71SArnaud Ebalard struct mutex update_lock; 137*594fbe71SArnaud Ebalard 138*594fbe71SArnaud Ebalard /* board specific parameters. */ 139*594fbe71SArnaud Ebalard u32 clk_freq; 140*594fbe71SArnaud Ebalard 141*594fbe71SArnaud Ebalard /* g762 register cache */ 142*594fbe71SArnaud Ebalard bool valid; 143*594fbe71SArnaud Ebalard unsigned long last_updated; /* in jiffies */ 144*594fbe71SArnaud Ebalard 145*594fbe71SArnaud Ebalard u8 set_cnt; /* controls fan rotation speed in closed-loop mode */ 146*594fbe71SArnaud Ebalard u8 act_cnt; /* provides access to current fan RPM value */ 147*594fbe71SArnaud Ebalard u8 fan_sta; /* bit 0: set when actual fan speed is more than 148*594fbe71SArnaud Ebalard * 25% outside requested fan speed 149*594fbe71SArnaud Ebalard * bit 1: set when no transition occurs on fan 150*594fbe71SArnaud Ebalard * pin for 0.7s 151*594fbe71SArnaud Ebalard */ 152*594fbe71SArnaud Ebalard u8 set_out; /* controls fan rotation speed in open-loop mode */ 153*594fbe71SArnaud Ebalard u8 fan_cmd1; /* 0: FG_PLS_ID0 FG pulses count per revolution 154*594fbe71SArnaud Ebalard * 0: 2 counts per revolution 155*594fbe71SArnaud Ebalard * 1: 4 counts per revolution 156*594fbe71SArnaud Ebalard * 1: PWM_POLARITY 1: negative_duty 157*594fbe71SArnaud Ebalard * 0: positive_duty 158*594fbe71SArnaud Ebalard * 2,3: [FG_CLOCK_ID0, FG_CLK_ID1] 159*594fbe71SArnaud Ebalard * 00: Divide fan clock by 1 160*594fbe71SArnaud Ebalard * 01: Divide fan clock by 2 161*594fbe71SArnaud Ebalard * 10: Divide fan clock by 4 162*594fbe71SArnaud Ebalard * 11: Divide fan clock by 8 163*594fbe71SArnaud Ebalard * 4: FAN_MODE 1:closed-loop, 0:open-loop 164*594fbe71SArnaud Ebalard * 5: OUT_MODE 1:PWM, 0:DC 165*594fbe71SArnaud Ebalard * 6: DET_FAN_OOC enable "fan ooc" status 166*594fbe71SArnaud Ebalard * 7: DET_FAN_FAIL enable "fan fail" status 167*594fbe71SArnaud Ebalard */ 168*594fbe71SArnaud Ebalard u8 fan_cmd2; /* 0,1: FAN_STARTV 0,1,2,3 -> 0,32,64,96 dac_code 169*594fbe71SArnaud Ebalard * 2,3: FG_GEAR_MODE 170*594fbe71SArnaud Ebalard * 00: multiplier = 1 171*594fbe71SArnaud Ebalard * 01: multiplier = 2 172*594fbe71SArnaud Ebalard * 10: multiplier = 4 173*594fbe71SArnaud Ebalard * 4: Mask ALERT# (g763 only) 174*594fbe71SArnaud Ebalard */ 175*594fbe71SArnaud Ebalard }; 176*594fbe71SArnaud Ebalard 177*594fbe71SArnaud Ebalard /* 178*594fbe71SArnaud Ebalard * Convert count value from fan controller register (FAN_SET_CNT) into fan 179*594fbe71SArnaud Ebalard * speed RPM value. Note that the datasheet documents a basic formula; 180*594fbe71SArnaud Ebalard * influence of additional parameters (fan clock divisor, fan gear mode) 181*594fbe71SArnaud Ebalard * have been infered from examples in the datasheet and tests. 182*594fbe71SArnaud Ebalard */ 183*594fbe71SArnaud Ebalard static inline unsigned int rpm_from_cnt(u8 cnt, u32 clk_freq, u16 p, 184*594fbe71SArnaud Ebalard u8 clk_div, u8 gear_mult) 185*594fbe71SArnaud Ebalard { 186*594fbe71SArnaud Ebalard if (cnt == 0xff) /* setting cnt to 255 stops the fan */ 187*594fbe71SArnaud Ebalard return 0; 188*594fbe71SArnaud Ebalard 189*594fbe71SArnaud Ebalard return (clk_freq * 30 * gear_mult) / ((cnt ? cnt : 1) * p * clk_div); 190*594fbe71SArnaud Ebalard } 191*594fbe71SArnaud Ebalard 192*594fbe71SArnaud Ebalard /* 193*594fbe71SArnaud Ebalard * Convert fan RPM value from sysfs into count value for fan controller 194*594fbe71SArnaud Ebalard * register (FAN_SET_CNT). 195*594fbe71SArnaud Ebalard */ 196*594fbe71SArnaud Ebalard static inline unsigned char cnt_from_rpm(u32 rpm, u32 clk_freq, u16 p, 197*594fbe71SArnaud Ebalard u8 clk_div, u8 gear_mult) 198*594fbe71SArnaud Ebalard { 199*594fbe71SArnaud Ebalard if (!rpm) /* to stop the fan, set cnt to 255 */ 200*594fbe71SArnaud Ebalard return 0xff; 201*594fbe71SArnaud Ebalard 202*594fbe71SArnaud Ebalard return clamp_val(((clk_freq * 30 * gear_mult) / (rpm * p * clk_div)), 203*594fbe71SArnaud Ebalard 0, 255); 204*594fbe71SArnaud Ebalard } 205*594fbe71SArnaud Ebalard 206*594fbe71SArnaud Ebalard /* helper to grab and cache data, at most one time per second */ 207*594fbe71SArnaud Ebalard static struct g762_data *g762_update_client(struct device *dev) 208*594fbe71SArnaud Ebalard { 209*594fbe71SArnaud Ebalard struct i2c_client *client = to_i2c_client(dev); 210*594fbe71SArnaud Ebalard struct g762_data *data = i2c_get_clientdata(client); 211*594fbe71SArnaud Ebalard int ret = 0; 212*594fbe71SArnaud Ebalard 213*594fbe71SArnaud Ebalard mutex_lock(&data->update_lock); 214*594fbe71SArnaud Ebalard if (time_before(jiffies, data->last_updated + G762_UPDATE_INTERVAL) && 215*594fbe71SArnaud Ebalard likely(data->valid)) 216*594fbe71SArnaud Ebalard goto out; 217*594fbe71SArnaud Ebalard 218*594fbe71SArnaud Ebalard ret = i2c_smbus_read_byte_data(client, G762_REG_SET_CNT); 219*594fbe71SArnaud Ebalard if (ret < 0) 220*594fbe71SArnaud Ebalard goto out; 221*594fbe71SArnaud Ebalard data->set_cnt = ret; 222*594fbe71SArnaud Ebalard 223*594fbe71SArnaud Ebalard ret = i2c_smbus_read_byte_data(client, G762_REG_ACT_CNT); 224*594fbe71SArnaud Ebalard if (ret < 0) 225*594fbe71SArnaud Ebalard goto out; 226*594fbe71SArnaud Ebalard data->act_cnt = ret; 227*594fbe71SArnaud Ebalard 228*594fbe71SArnaud Ebalard ret = i2c_smbus_read_byte_data(client, G762_REG_FAN_STA); 229*594fbe71SArnaud Ebalard if (ret < 0) 230*594fbe71SArnaud Ebalard goto out; 231*594fbe71SArnaud Ebalard data->fan_sta = ret; 232*594fbe71SArnaud Ebalard 233*594fbe71SArnaud Ebalard ret = i2c_smbus_read_byte_data(client, G762_REG_SET_OUT); 234*594fbe71SArnaud Ebalard if (ret < 0) 235*594fbe71SArnaud Ebalard goto out; 236*594fbe71SArnaud Ebalard data->set_out = ret; 237*594fbe71SArnaud Ebalard 238*594fbe71SArnaud Ebalard ret = i2c_smbus_read_byte_data(client, G762_REG_FAN_CMD1); 239*594fbe71SArnaud Ebalard if (ret < 0) 240*594fbe71SArnaud Ebalard goto out; 241*594fbe71SArnaud Ebalard data->fan_cmd1 = ret; 242*594fbe71SArnaud Ebalard 243*594fbe71SArnaud Ebalard ret = i2c_smbus_read_byte_data(client, G762_REG_FAN_CMD2); 244*594fbe71SArnaud Ebalard if (ret < 0) 245*594fbe71SArnaud Ebalard goto out; 246*594fbe71SArnaud Ebalard data->fan_cmd2 = ret; 247*594fbe71SArnaud Ebalard 248*594fbe71SArnaud Ebalard data->last_updated = jiffies; 249*594fbe71SArnaud Ebalard data->valid = true; 250*594fbe71SArnaud Ebalard out: 251*594fbe71SArnaud Ebalard mutex_unlock(&data->update_lock); 252*594fbe71SArnaud Ebalard 253*594fbe71SArnaud Ebalard if (ret < 0) /* upon error, encode it in return value */ 254*594fbe71SArnaud Ebalard data = ERR_PTR(ret); 255*594fbe71SArnaud Ebalard 256*594fbe71SArnaud Ebalard return data; 257*594fbe71SArnaud Ebalard } 258*594fbe71SArnaud Ebalard 259*594fbe71SArnaud Ebalard /* helpers for writing hardware parameters */ 260*594fbe71SArnaud Ebalard 261*594fbe71SArnaud Ebalard /* 262*594fbe71SArnaud Ebalard * Set input clock frequency received on CLK pin of the chip. Accepted values 263*594fbe71SArnaud Ebalard * are between 0 and 0xffffff. If zero is given, then default frequency 264*594fbe71SArnaud Ebalard * (32,768Hz) is used. Note that clock frequency is a characteristic of the 265*594fbe71SArnaud Ebalard * system but an internal parameter, i.e. value is not passed to the device. 266*594fbe71SArnaud Ebalard */ 267*594fbe71SArnaud Ebalard static int do_set_clk_freq(struct device *dev, unsigned long val) 268*594fbe71SArnaud Ebalard { 269*594fbe71SArnaud Ebalard struct i2c_client *client = to_i2c_client(dev); 270*594fbe71SArnaud Ebalard struct g762_data *data = i2c_get_clientdata(client); 271*594fbe71SArnaud Ebalard 272*594fbe71SArnaud Ebalard if (val > 0xffffff) 273*594fbe71SArnaud Ebalard return -EINVAL; 274*594fbe71SArnaud Ebalard if (!val) 275*594fbe71SArnaud Ebalard val = 32768; 276*594fbe71SArnaud Ebalard 277*594fbe71SArnaud Ebalard data->clk_freq = val; 278*594fbe71SArnaud Ebalard 279*594fbe71SArnaud Ebalard return 0; 280*594fbe71SArnaud Ebalard } 281*594fbe71SArnaud Ebalard 282*594fbe71SArnaud Ebalard /* Set pwm mode. Accepts either 0 (PWM mode) or 1 (DC mode) */ 283*594fbe71SArnaud Ebalard static int do_set_pwm_mode(struct device *dev, unsigned long val) 284*594fbe71SArnaud Ebalard { 285*594fbe71SArnaud Ebalard struct i2c_client *client = to_i2c_client(dev); 286*594fbe71SArnaud Ebalard struct g762_data *data = g762_update_client(dev); 287*594fbe71SArnaud Ebalard int ret; 288*594fbe71SArnaud Ebalard 289*594fbe71SArnaud Ebalard if (IS_ERR(data)) 290*594fbe71SArnaud Ebalard return PTR_ERR(data); 291*594fbe71SArnaud Ebalard 292*594fbe71SArnaud Ebalard mutex_lock(&data->update_lock); 293*594fbe71SArnaud Ebalard switch (val) { 294*594fbe71SArnaud Ebalard case G762_OUT_MODE_PWM: 295*594fbe71SArnaud Ebalard data->fan_cmd1 |= G762_REG_FAN_CMD1_OUT_MODE; 296*594fbe71SArnaud Ebalard break; 297*594fbe71SArnaud Ebalard case G762_OUT_MODE_DC: 298*594fbe71SArnaud Ebalard data->fan_cmd1 &= ~G762_REG_FAN_CMD1_OUT_MODE; 299*594fbe71SArnaud Ebalard break; 300*594fbe71SArnaud Ebalard default: 301*594fbe71SArnaud Ebalard ret = -EINVAL; 302*594fbe71SArnaud Ebalard goto out; 303*594fbe71SArnaud Ebalard } 304*594fbe71SArnaud Ebalard ret = i2c_smbus_write_byte_data(client, G762_REG_FAN_CMD1, 305*594fbe71SArnaud Ebalard data->fan_cmd1); 306*594fbe71SArnaud Ebalard data->valid = false; 307*594fbe71SArnaud Ebalard out: 308*594fbe71SArnaud Ebalard mutex_unlock(&data->update_lock); 309*594fbe71SArnaud Ebalard 310*594fbe71SArnaud Ebalard return ret; 311*594fbe71SArnaud Ebalard } 312*594fbe71SArnaud Ebalard 313*594fbe71SArnaud Ebalard /* Set fan clock divisor. Accepts either 1, 2, 4 or 8. */ 314*594fbe71SArnaud Ebalard static int do_set_fan_div(struct device *dev, unsigned long val) 315*594fbe71SArnaud Ebalard { 316*594fbe71SArnaud Ebalard struct i2c_client *client = to_i2c_client(dev); 317*594fbe71SArnaud Ebalard struct g762_data *data = g762_update_client(dev); 318*594fbe71SArnaud Ebalard int ret; 319*594fbe71SArnaud Ebalard 320*594fbe71SArnaud Ebalard if (IS_ERR(data)) 321*594fbe71SArnaud Ebalard return PTR_ERR(data); 322*594fbe71SArnaud Ebalard 323*594fbe71SArnaud Ebalard mutex_lock(&data->update_lock); 324*594fbe71SArnaud Ebalard switch (val) { 325*594fbe71SArnaud Ebalard case 1: 326*594fbe71SArnaud Ebalard data->fan_cmd1 &= ~G762_REG_FAN_CMD1_CLK_DIV_ID0; 327*594fbe71SArnaud Ebalard data->fan_cmd1 &= ~G762_REG_FAN_CMD1_CLK_DIV_ID1; 328*594fbe71SArnaud Ebalard break; 329*594fbe71SArnaud Ebalard case 2: 330*594fbe71SArnaud Ebalard data->fan_cmd1 |= G762_REG_FAN_CMD1_CLK_DIV_ID0; 331*594fbe71SArnaud Ebalard data->fan_cmd1 &= ~G762_REG_FAN_CMD1_CLK_DIV_ID1; 332*594fbe71SArnaud Ebalard break; 333*594fbe71SArnaud Ebalard case 4: 334*594fbe71SArnaud Ebalard data->fan_cmd1 &= ~G762_REG_FAN_CMD1_CLK_DIV_ID0; 335*594fbe71SArnaud Ebalard data->fan_cmd1 |= G762_REG_FAN_CMD1_CLK_DIV_ID1; 336*594fbe71SArnaud Ebalard break; 337*594fbe71SArnaud Ebalard case 8: 338*594fbe71SArnaud Ebalard data->fan_cmd1 |= G762_REG_FAN_CMD1_CLK_DIV_ID0; 339*594fbe71SArnaud Ebalard data->fan_cmd1 |= G762_REG_FAN_CMD1_CLK_DIV_ID1; 340*594fbe71SArnaud Ebalard break; 341*594fbe71SArnaud Ebalard default: 342*594fbe71SArnaud Ebalard ret = -EINVAL; 343*594fbe71SArnaud Ebalard goto out; 344*594fbe71SArnaud Ebalard } 345*594fbe71SArnaud Ebalard ret = i2c_smbus_write_byte_data(client, G762_REG_FAN_CMD1, 346*594fbe71SArnaud Ebalard data->fan_cmd1); 347*594fbe71SArnaud Ebalard data->valid = false; 348*594fbe71SArnaud Ebalard out: 349*594fbe71SArnaud Ebalard mutex_unlock(&data->update_lock); 350*594fbe71SArnaud Ebalard 351*594fbe71SArnaud Ebalard return ret; 352*594fbe71SArnaud Ebalard } 353*594fbe71SArnaud Ebalard 354*594fbe71SArnaud Ebalard /* Set fan gear mode. Accepts either 0, 1 or 2. */ 355*594fbe71SArnaud Ebalard static int do_set_fan_gear_mode(struct device *dev, unsigned long val) 356*594fbe71SArnaud Ebalard { 357*594fbe71SArnaud Ebalard struct i2c_client *client = to_i2c_client(dev); 358*594fbe71SArnaud Ebalard struct g762_data *data = g762_update_client(dev); 359*594fbe71SArnaud Ebalard int ret; 360*594fbe71SArnaud Ebalard 361*594fbe71SArnaud Ebalard if (IS_ERR(data)) 362*594fbe71SArnaud Ebalard return PTR_ERR(data); 363*594fbe71SArnaud Ebalard 364*594fbe71SArnaud Ebalard mutex_lock(&data->update_lock); 365*594fbe71SArnaud Ebalard switch (val) { 366*594fbe71SArnaud Ebalard case 0: 367*594fbe71SArnaud Ebalard data->fan_cmd2 &= ~G762_REG_FAN_CMD2_GEAR_MODE_0; 368*594fbe71SArnaud Ebalard data->fan_cmd2 &= ~G762_REG_FAN_CMD2_GEAR_MODE_1; 369*594fbe71SArnaud Ebalard break; 370*594fbe71SArnaud Ebalard case 1: 371*594fbe71SArnaud Ebalard data->fan_cmd2 |= G762_REG_FAN_CMD2_GEAR_MODE_0; 372*594fbe71SArnaud Ebalard data->fan_cmd2 &= ~G762_REG_FAN_CMD2_GEAR_MODE_1; 373*594fbe71SArnaud Ebalard break; 374*594fbe71SArnaud Ebalard case 2: 375*594fbe71SArnaud Ebalard data->fan_cmd2 &= ~G762_REG_FAN_CMD2_GEAR_MODE_0; 376*594fbe71SArnaud Ebalard data->fan_cmd2 |= G762_REG_FAN_CMD2_GEAR_MODE_1; 377*594fbe71SArnaud Ebalard break; 378*594fbe71SArnaud Ebalard default: 379*594fbe71SArnaud Ebalard ret = -EINVAL; 380*594fbe71SArnaud Ebalard goto out; 381*594fbe71SArnaud Ebalard } 382*594fbe71SArnaud Ebalard ret = i2c_smbus_write_byte_data(client, G762_REG_FAN_CMD2, 383*594fbe71SArnaud Ebalard data->fan_cmd2); 384*594fbe71SArnaud Ebalard data->valid = false; 385*594fbe71SArnaud Ebalard out: 386*594fbe71SArnaud Ebalard mutex_unlock(&data->update_lock); 387*594fbe71SArnaud Ebalard 388*594fbe71SArnaud Ebalard return ret; 389*594fbe71SArnaud Ebalard } 390*594fbe71SArnaud Ebalard 391*594fbe71SArnaud Ebalard /* Set number of fan pulses per revolution. Accepts either 2 or 4. */ 392*594fbe71SArnaud Ebalard static int do_set_fan_pulses(struct device *dev, unsigned long val) 393*594fbe71SArnaud Ebalard { 394*594fbe71SArnaud Ebalard struct i2c_client *client = to_i2c_client(dev); 395*594fbe71SArnaud Ebalard struct g762_data *data = g762_update_client(dev); 396*594fbe71SArnaud Ebalard int ret; 397*594fbe71SArnaud Ebalard 398*594fbe71SArnaud Ebalard if (IS_ERR(data)) 399*594fbe71SArnaud Ebalard return PTR_ERR(data); 400*594fbe71SArnaud Ebalard 401*594fbe71SArnaud Ebalard mutex_lock(&data->update_lock); 402*594fbe71SArnaud Ebalard switch (val) { 403*594fbe71SArnaud Ebalard case 2: 404*594fbe71SArnaud Ebalard data->fan_cmd1 &= ~G762_REG_FAN_CMD1_PULSE_PER_REV; 405*594fbe71SArnaud Ebalard break; 406*594fbe71SArnaud Ebalard case 4: 407*594fbe71SArnaud Ebalard data->fan_cmd1 |= G762_REG_FAN_CMD1_PULSE_PER_REV; 408*594fbe71SArnaud Ebalard break; 409*594fbe71SArnaud Ebalard default: 410*594fbe71SArnaud Ebalard ret = -EINVAL; 411*594fbe71SArnaud Ebalard goto out; 412*594fbe71SArnaud Ebalard } 413*594fbe71SArnaud Ebalard ret = i2c_smbus_write_byte_data(client, G762_REG_FAN_CMD1, 414*594fbe71SArnaud Ebalard data->fan_cmd1); 415*594fbe71SArnaud Ebalard data->valid = false; 416*594fbe71SArnaud Ebalard out: 417*594fbe71SArnaud Ebalard mutex_unlock(&data->update_lock); 418*594fbe71SArnaud Ebalard 419*594fbe71SArnaud Ebalard return ret; 420*594fbe71SArnaud Ebalard } 421*594fbe71SArnaud Ebalard 422*594fbe71SArnaud Ebalard /* Set fan mode. Accepts either 1 (open-loop) or 2 (closed-loop). */ 423*594fbe71SArnaud Ebalard static int do_set_pwm_enable(struct device *dev, unsigned long val) 424*594fbe71SArnaud Ebalard { 425*594fbe71SArnaud Ebalard struct i2c_client *client = to_i2c_client(dev); 426*594fbe71SArnaud Ebalard struct g762_data *data = g762_update_client(dev); 427*594fbe71SArnaud Ebalard int ret; 428*594fbe71SArnaud Ebalard 429*594fbe71SArnaud Ebalard if (IS_ERR(data)) 430*594fbe71SArnaud Ebalard return PTR_ERR(data); 431*594fbe71SArnaud Ebalard 432*594fbe71SArnaud Ebalard mutex_lock(&data->update_lock); 433*594fbe71SArnaud Ebalard switch (val) { 434*594fbe71SArnaud Ebalard case G762_FAN_MODE_CLOSED_LOOP: 435*594fbe71SArnaud Ebalard data->fan_cmd1 |= G762_REG_FAN_CMD1_FAN_MODE; 436*594fbe71SArnaud Ebalard break; 437*594fbe71SArnaud Ebalard case G762_FAN_MODE_OPEN_LOOP: 438*594fbe71SArnaud Ebalard data->fan_cmd1 &= ~G762_REG_FAN_CMD1_FAN_MODE; 439*594fbe71SArnaud Ebalard /* 440*594fbe71SArnaud Ebalard * BUG FIX: if SET_CNT register value is 255 then, for some 441*594fbe71SArnaud Ebalard * unknown reason, fan will not rotate as expected, no matter 442*594fbe71SArnaud Ebalard * the value of SET_OUT (to be specific, this seems to happen 443*594fbe71SArnaud Ebalard * only in PWM mode). To workaround this bug, we give SET_CNT 444*594fbe71SArnaud Ebalard * value of 254 if it is 255 when switching to open-loop. 445*594fbe71SArnaud Ebalard */ 446*594fbe71SArnaud Ebalard if (data->set_cnt == 0xff) 447*594fbe71SArnaud Ebalard i2c_smbus_write_byte_data(client, G762_REG_SET_CNT, 448*594fbe71SArnaud Ebalard 254); 449*594fbe71SArnaud Ebalard break; 450*594fbe71SArnaud Ebalard default: 451*594fbe71SArnaud Ebalard ret = -EINVAL; 452*594fbe71SArnaud Ebalard goto out; 453*594fbe71SArnaud Ebalard } 454*594fbe71SArnaud Ebalard 455*594fbe71SArnaud Ebalard ret = i2c_smbus_write_byte_data(client, G762_REG_FAN_CMD1, 456*594fbe71SArnaud Ebalard data->fan_cmd1); 457*594fbe71SArnaud Ebalard data->valid = false; 458*594fbe71SArnaud Ebalard out: 459*594fbe71SArnaud Ebalard mutex_unlock(&data->update_lock); 460*594fbe71SArnaud Ebalard 461*594fbe71SArnaud Ebalard return ret; 462*594fbe71SArnaud Ebalard } 463*594fbe71SArnaud Ebalard 464*594fbe71SArnaud Ebalard /* Set PWM polarity. Accepts either 0 (positive duty) or 1 (negative duty) */ 465*594fbe71SArnaud Ebalard static int do_set_pwm_polarity(struct device *dev, unsigned long val) 466*594fbe71SArnaud Ebalard { 467*594fbe71SArnaud Ebalard struct i2c_client *client = to_i2c_client(dev); 468*594fbe71SArnaud Ebalard struct g762_data *data = g762_update_client(dev); 469*594fbe71SArnaud Ebalard int ret; 470*594fbe71SArnaud Ebalard 471*594fbe71SArnaud Ebalard if (IS_ERR(data)) 472*594fbe71SArnaud Ebalard return PTR_ERR(data); 473*594fbe71SArnaud Ebalard 474*594fbe71SArnaud Ebalard mutex_lock(&data->update_lock); 475*594fbe71SArnaud Ebalard switch (val) { 476*594fbe71SArnaud Ebalard case G762_PWM_POLARITY_POSITIVE: 477*594fbe71SArnaud Ebalard data->fan_cmd1 &= ~G762_REG_FAN_CMD1_PWM_POLARITY; 478*594fbe71SArnaud Ebalard break; 479*594fbe71SArnaud Ebalard case G762_PWM_POLARITY_NEGATIVE: 480*594fbe71SArnaud Ebalard data->fan_cmd1 |= G762_REG_FAN_CMD1_PWM_POLARITY; 481*594fbe71SArnaud Ebalard break; 482*594fbe71SArnaud Ebalard default: 483*594fbe71SArnaud Ebalard ret = -EINVAL; 484*594fbe71SArnaud Ebalard goto out; 485*594fbe71SArnaud Ebalard } 486*594fbe71SArnaud Ebalard ret = i2c_smbus_write_byte_data(client, G762_REG_FAN_CMD1, 487*594fbe71SArnaud Ebalard data->fan_cmd1); 488*594fbe71SArnaud Ebalard data->valid = false; 489*594fbe71SArnaud Ebalard out: 490*594fbe71SArnaud Ebalard mutex_unlock(&data->update_lock); 491*594fbe71SArnaud Ebalard 492*594fbe71SArnaud Ebalard return ret; 493*594fbe71SArnaud Ebalard } 494*594fbe71SArnaud Ebalard 495*594fbe71SArnaud Ebalard /* 496*594fbe71SArnaud Ebalard * Set pwm value. Accepts values between 0 (stops the fan) and 497*594fbe71SArnaud Ebalard * 255 (full speed). This only makes sense in open-loop mode. 498*594fbe71SArnaud Ebalard */ 499*594fbe71SArnaud Ebalard static int do_set_pwm(struct device *dev, unsigned long val) 500*594fbe71SArnaud Ebalard { 501*594fbe71SArnaud Ebalard struct i2c_client *client = to_i2c_client(dev); 502*594fbe71SArnaud Ebalard struct g762_data *data = i2c_get_clientdata(client); 503*594fbe71SArnaud Ebalard int ret; 504*594fbe71SArnaud Ebalard 505*594fbe71SArnaud Ebalard if (val > 255) 506*594fbe71SArnaud Ebalard return -EINVAL; 507*594fbe71SArnaud Ebalard 508*594fbe71SArnaud Ebalard mutex_lock(&data->update_lock); 509*594fbe71SArnaud Ebalard ret = i2c_smbus_write_byte_data(client, G762_REG_SET_OUT, val); 510*594fbe71SArnaud Ebalard data->valid = false; 511*594fbe71SArnaud Ebalard mutex_unlock(&data->update_lock); 512*594fbe71SArnaud Ebalard 513*594fbe71SArnaud Ebalard return ret; 514*594fbe71SArnaud Ebalard } 515*594fbe71SArnaud Ebalard 516*594fbe71SArnaud Ebalard /* 517*594fbe71SArnaud Ebalard * Set fan RPM value. Can be called both in closed and open-loop mode 518*594fbe71SArnaud Ebalard * but effect will only be seen after closed-loop mode is configured. 519*594fbe71SArnaud Ebalard */ 520*594fbe71SArnaud Ebalard static int do_set_fan_target(struct device *dev, unsigned long val) 521*594fbe71SArnaud Ebalard { 522*594fbe71SArnaud Ebalard struct i2c_client *client = to_i2c_client(dev); 523*594fbe71SArnaud Ebalard struct g762_data *data = g762_update_client(dev); 524*594fbe71SArnaud Ebalard int ret; 525*594fbe71SArnaud Ebalard 526*594fbe71SArnaud Ebalard if (IS_ERR(data)) 527*594fbe71SArnaud Ebalard return PTR_ERR(data); 528*594fbe71SArnaud Ebalard 529*594fbe71SArnaud Ebalard mutex_lock(&data->update_lock); 530*594fbe71SArnaud Ebalard data->set_cnt = cnt_from_rpm(val, data->clk_freq, 531*594fbe71SArnaud Ebalard G762_PULSE_FROM_REG(data->fan_cmd1), 532*594fbe71SArnaud Ebalard G762_CLKDIV_FROM_REG(data->fan_cmd1), 533*594fbe71SArnaud Ebalard G762_GEARMULT_FROM_REG(data->fan_cmd2)); 534*594fbe71SArnaud Ebalard ret = i2c_smbus_write_byte_data(client, G762_REG_SET_CNT, 535*594fbe71SArnaud Ebalard data->set_cnt); 536*594fbe71SArnaud Ebalard data->valid = false; 537*594fbe71SArnaud Ebalard mutex_unlock(&data->update_lock); 538*594fbe71SArnaud Ebalard 539*594fbe71SArnaud Ebalard return ret; 540*594fbe71SArnaud Ebalard } 541*594fbe71SArnaud Ebalard 542*594fbe71SArnaud Ebalard /* Set fan startup voltage. Accepted values are either 0, 1, 2 or 3. */ 543*594fbe71SArnaud Ebalard static int do_set_fan_startv(struct device *dev, unsigned long val) 544*594fbe71SArnaud Ebalard { 545*594fbe71SArnaud Ebalard struct i2c_client *client = to_i2c_client(dev); 546*594fbe71SArnaud Ebalard struct g762_data *data = g762_update_client(dev); 547*594fbe71SArnaud Ebalard int ret; 548*594fbe71SArnaud Ebalard 549*594fbe71SArnaud Ebalard if (IS_ERR(data)) 550*594fbe71SArnaud Ebalard return PTR_ERR(data); 551*594fbe71SArnaud Ebalard 552*594fbe71SArnaud Ebalard mutex_lock(&data->update_lock); 553*594fbe71SArnaud Ebalard switch (val) { 554*594fbe71SArnaud Ebalard case 0: 555*594fbe71SArnaud Ebalard data->fan_cmd2 &= ~G762_REG_FAN_CMD2_FAN_STARTV_0; 556*594fbe71SArnaud Ebalard data->fan_cmd2 &= ~G762_REG_FAN_CMD2_FAN_STARTV_1; 557*594fbe71SArnaud Ebalard break; 558*594fbe71SArnaud Ebalard case 1: 559*594fbe71SArnaud Ebalard data->fan_cmd2 |= G762_REG_FAN_CMD2_FAN_STARTV_0; 560*594fbe71SArnaud Ebalard data->fan_cmd2 &= ~G762_REG_FAN_CMD2_FAN_STARTV_1; 561*594fbe71SArnaud Ebalard break; 562*594fbe71SArnaud Ebalard case 2: 563*594fbe71SArnaud Ebalard data->fan_cmd2 &= ~G762_REG_FAN_CMD2_FAN_STARTV_0; 564*594fbe71SArnaud Ebalard data->fan_cmd2 |= G762_REG_FAN_CMD2_FAN_STARTV_1; 565*594fbe71SArnaud Ebalard break; 566*594fbe71SArnaud Ebalard case 3: 567*594fbe71SArnaud Ebalard data->fan_cmd2 |= G762_REG_FAN_CMD2_FAN_STARTV_0; 568*594fbe71SArnaud Ebalard data->fan_cmd2 |= G762_REG_FAN_CMD2_FAN_STARTV_1; 569*594fbe71SArnaud Ebalard break; 570*594fbe71SArnaud Ebalard default: 571*594fbe71SArnaud Ebalard ret = -EINVAL; 572*594fbe71SArnaud Ebalard goto out; 573*594fbe71SArnaud Ebalard } 574*594fbe71SArnaud Ebalard ret = i2c_smbus_write_byte_data(client, G762_REG_FAN_CMD2, 575*594fbe71SArnaud Ebalard data->fan_cmd2); 576*594fbe71SArnaud Ebalard data->valid = false; 577*594fbe71SArnaud Ebalard out: 578*594fbe71SArnaud Ebalard mutex_unlock(&data->update_lock); 579*594fbe71SArnaud Ebalard 580*594fbe71SArnaud Ebalard return ret; 581*594fbe71SArnaud Ebalard } 582*594fbe71SArnaud Ebalard 583*594fbe71SArnaud Ebalard /* 584*594fbe71SArnaud Ebalard * Helper to import hardware characteristics from .dts file and push 585*594fbe71SArnaud Ebalard * those to the chip. 586*594fbe71SArnaud Ebalard */ 587*594fbe71SArnaud Ebalard 588*594fbe71SArnaud Ebalard #ifdef CONFIG_OF 589*594fbe71SArnaud Ebalard static struct of_device_id g762_dt_match[] = { 590*594fbe71SArnaud Ebalard { .compatible = "gmt,g762" }, 591*594fbe71SArnaud Ebalard { .compatible = "gmt,g763" }, 592*594fbe71SArnaud Ebalard { }, 593*594fbe71SArnaud Ebalard }; 594*594fbe71SArnaud Ebalard 595*594fbe71SArnaud Ebalard /* 596*594fbe71SArnaud Ebalard * Grab clock (a required property), enable it, get (fixed) clock frequency 597*594fbe71SArnaud Ebalard * and store it. Note: upon success, clock has been prepared and enabled; it 598*594fbe71SArnaud Ebalard * must later be unprepared and disabled (e.g. during module unloading) by a 599*594fbe71SArnaud Ebalard * call to g762_of_clock_disable(). Note that a reference to clock is kept 600*594fbe71SArnaud Ebalard * in our private data structure to be used in this function. 601*594fbe71SArnaud Ebalard */ 602*594fbe71SArnaud Ebalard static int g762_of_clock_enable(struct i2c_client *client) 603*594fbe71SArnaud Ebalard { 604*594fbe71SArnaud Ebalard struct g762_data *data; 605*594fbe71SArnaud Ebalard unsigned long clk_freq; 606*594fbe71SArnaud Ebalard struct clk *clk; 607*594fbe71SArnaud Ebalard int ret; 608*594fbe71SArnaud Ebalard 609*594fbe71SArnaud Ebalard if (!client->dev.of_node) 610*594fbe71SArnaud Ebalard return 0; 611*594fbe71SArnaud Ebalard 612*594fbe71SArnaud Ebalard clk = of_clk_get(client->dev.of_node, 0); 613*594fbe71SArnaud Ebalard if (IS_ERR(clk)) { 614*594fbe71SArnaud Ebalard dev_err(&client->dev, "failed to get clock\n"); 615*594fbe71SArnaud Ebalard return PTR_ERR(clk); 616*594fbe71SArnaud Ebalard } 617*594fbe71SArnaud Ebalard 618*594fbe71SArnaud Ebalard ret = clk_prepare_enable(clk); 619*594fbe71SArnaud Ebalard if (ret) { 620*594fbe71SArnaud Ebalard dev_err(&client->dev, "failed to enable clock\n"); 621*594fbe71SArnaud Ebalard goto clk_put; 622*594fbe71SArnaud Ebalard } 623*594fbe71SArnaud Ebalard 624*594fbe71SArnaud Ebalard clk_freq = clk_get_rate(clk); 625*594fbe71SArnaud Ebalard ret = do_set_clk_freq(&client->dev, clk_freq); 626*594fbe71SArnaud Ebalard if (ret) { 627*594fbe71SArnaud Ebalard dev_err(&client->dev, "invalid clock freq %lu\n", clk_freq); 628*594fbe71SArnaud Ebalard goto clk_unprep; 629*594fbe71SArnaud Ebalard } 630*594fbe71SArnaud Ebalard 631*594fbe71SArnaud Ebalard data = i2c_get_clientdata(client); 632*594fbe71SArnaud Ebalard data->clk = clk; 633*594fbe71SArnaud Ebalard 634*594fbe71SArnaud Ebalard return 0; 635*594fbe71SArnaud Ebalard 636*594fbe71SArnaud Ebalard clk_unprep: 637*594fbe71SArnaud Ebalard clk_disable_unprepare(clk); 638*594fbe71SArnaud Ebalard 639*594fbe71SArnaud Ebalard clk_put: 640*594fbe71SArnaud Ebalard clk_put(clk); 641*594fbe71SArnaud Ebalard 642*594fbe71SArnaud Ebalard return ret; 643*594fbe71SArnaud Ebalard } 644*594fbe71SArnaud Ebalard 645*594fbe71SArnaud Ebalard static void g762_of_clock_disable(struct i2c_client *client) 646*594fbe71SArnaud Ebalard { 647*594fbe71SArnaud Ebalard struct g762_data *data = i2c_get_clientdata(client); 648*594fbe71SArnaud Ebalard 649*594fbe71SArnaud Ebalard if (!data->clk) 650*594fbe71SArnaud Ebalard return; 651*594fbe71SArnaud Ebalard 652*594fbe71SArnaud Ebalard clk_disable_unprepare(data->clk); 653*594fbe71SArnaud Ebalard clk_put(data->clk); 654*594fbe71SArnaud Ebalard } 655*594fbe71SArnaud Ebalard 656*594fbe71SArnaud Ebalard static int g762_of_prop_import_one(struct i2c_client *client, 657*594fbe71SArnaud Ebalard const char *pname, 658*594fbe71SArnaud Ebalard int (*psetter)(struct device *dev, 659*594fbe71SArnaud Ebalard unsigned long val)) 660*594fbe71SArnaud Ebalard { 661*594fbe71SArnaud Ebalard const __be32 *prop; 662*594fbe71SArnaud Ebalard int len, ret; 663*594fbe71SArnaud Ebalard u32 pval; 664*594fbe71SArnaud Ebalard 665*594fbe71SArnaud Ebalard prop = of_get_property(client->dev.of_node, pname, &len); 666*594fbe71SArnaud Ebalard if (!prop || len != sizeof(u32)) 667*594fbe71SArnaud Ebalard return 0; 668*594fbe71SArnaud Ebalard 669*594fbe71SArnaud Ebalard pval = be32_to_cpu(prop[0]); 670*594fbe71SArnaud Ebalard dev_dbg(&client->dev, "found %s (%d)\n", pname, pval); 671*594fbe71SArnaud Ebalard ret = (*psetter)(&client->dev, pval); 672*594fbe71SArnaud Ebalard if (ret) 673*594fbe71SArnaud Ebalard dev_err(&client->dev, "unable to set %s (%d)\n", pname, pval); 674*594fbe71SArnaud Ebalard 675*594fbe71SArnaud Ebalard return ret; 676*594fbe71SArnaud Ebalard } 677*594fbe71SArnaud Ebalard 678*594fbe71SArnaud Ebalard static int g762_of_prop_import(struct i2c_client *client) 679*594fbe71SArnaud Ebalard { 680*594fbe71SArnaud Ebalard int ret; 681*594fbe71SArnaud Ebalard 682*594fbe71SArnaud Ebalard if (!client->dev.of_node) 683*594fbe71SArnaud Ebalard return 0; 684*594fbe71SArnaud Ebalard 685*594fbe71SArnaud Ebalard ret = g762_of_prop_import_one(client, "fan_gear_mode", 686*594fbe71SArnaud Ebalard do_set_fan_gear_mode); 687*594fbe71SArnaud Ebalard if (ret) 688*594fbe71SArnaud Ebalard return ret; 689*594fbe71SArnaud Ebalard 690*594fbe71SArnaud Ebalard ret = g762_of_prop_import_one(client, "pwm_polarity", 691*594fbe71SArnaud Ebalard do_set_pwm_polarity); 692*594fbe71SArnaud Ebalard if (ret) 693*594fbe71SArnaud Ebalard return ret; 694*594fbe71SArnaud Ebalard 695*594fbe71SArnaud Ebalard return g762_of_prop_import_one(client, "fan_startv", 696*594fbe71SArnaud Ebalard do_set_fan_startv); 697*594fbe71SArnaud Ebalard } 698*594fbe71SArnaud Ebalard 699*594fbe71SArnaud Ebalard #else 700*594fbe71SArnaud Ebalard static int g762_of_prop_import(struct i2c_client *client) 701*594fbe71SArnaud Ebalard { 702*594fbe71SArnaud Ebalard return 0; 703*594fbe71SArnaud Ebalard } 704*594fbe71SArnaud Ebalard 705*594fbe71SArnaud Ebalard static int g762_of_clock_enable(struct i2c_client *client) 706*594fbe71SArnaud Ebalard { 707*594fbe71SArnaud Ebalard return 0; 708*594fbe71SArnaud Ebalard } 709*594fbe71SArnaud Ebalard 710*594fbe71SArnaud Ebalard static void g762_of_clock_disable(struct i2c_client *client) { } 711*594fbe71SArnaud Ebalard #endif 712*594fbe71SArnaud Ebalard 713*594fbe71SArnaud Ebalard /* 714*594fbe71SArnaud Ebalard * Helper to import hardware characteristics from .dts file and push 715*594fbe71SArnaud Ebalard * those to the chip. 716*594fbe71SArnaud Ebalard */ 717*594fbe71SArnaud Ebalard 718*594fbe71SArnaud Ebalard static int g762_pdata_prop_import(struct i2c_client *client) 719*594fbe71SArnaud Ebalard { 720*594fbe71SArnaud Ebalard struct g762_platform_data *pdata = client->dev.platform_data; 721*594fbe71SArnaud Ebalard int ret; 722*594fbe71SArnaud Ebalard 723*594fbe71SArnaud Ebalard if (!pdata) 724*594fbe71SArnaud Ebalard return 0; 725*594fbe71SArnaud Ebalard 726*594fbe71SArnaud Ebalard ret = do_set_fan_gear_mode(&client->dev, pdata->fan_gear_mode); 727*594fbe71SArnaud Ebalard if (ret) 728*594fbe71SArnaud Ebalard return ret; 729*594fbe71SArnaud Ebalard 730*594fbe71SArnaud Ebalard ret = do_set_pwm_polarity(&client->dev, pdata->pwm_polarity); 731*594fbe71SArnaud Ebalard if (ret) 732*594fbe71SArnaud Ebalard return ret; 733*594fbe71SArnaud Ebalard 734*594fbe71SArnaud Ebalard ret = do_set_fan_startv(&client->dev, pdata->fan_startv); 735*594fbe71SArnaud Ebalard if (ret) 736*594fbe71SArnaud Ebalard return ret; 737*594fbe71SArnaud Ebalard 738*594fbe71SArnaud Ebalard return do_set_clk_freq(&client->dev, pdata->clk_freq); 739*594fbe71SArnaud Ebalard } 740*594fbe71SArnaud Ebalard 741*594fbe71SArnaud Ebalard /* 742*594fbe71SArnaud Ebalard * sysfs attributes 743*594fbe71SArnaud Ebalard */ 744*594fbe71SArnaud Ebalard 745*594fbe71SArnaud Ebalard /* 746*594fbe71SArnaud Ebalard * Read function for fan1_input sysfs file. Return current fan RPM value, or 747*594fbe71SArnaud Ebalard * 0 if fan is out of control. 748*594fbe71SArnaud Ebalard */ 749*594fbe71SArnaud Ebalard static ssize_t get_fan_rpm(struct device *dev, struct device_attribute *da, 750*594fbe71SArnaud Ebalard char *buf) 751*594fbe71SArnaud Ebalard { 752*594fbe71SArnaud Ebalard struct g762_data *data = g762_update_client(dev); 753*594fbe71SArnaud Ebalard unsigned int rpm = 0; 754*594fbe71SArnaud Ebalard 755*594fbe71SArnaud Ebalard if (IS_ERR(data)) 756*594fbe71SArnaud Ebalard return PTR_ERR(data); 757*594fbe71SArnaud Ebalard 758*594fbe71SArnaud Ebalard mutex_lock(&data->update_lock); 759*594fbe71SArnaud Ebalard /* reverse logic: fan out of control reporting is enabled low */ 760*594fbe71SArnaud Ebalard if (data->fan_sta & G762_REG_FAN_STA_OOC) { 761*594fbe71SArnaud Ebalard rpm = rpm_from_cnt(data->act_cnt, data->clk_freq, 762*594fbe71SArnaud Ebalard G762_PULSE_FROM_REG(data->fan_cmd1), 763*594fbe71SArnaud Ebalard G762_CLKDIV_FROM_REG(data->fan_cmd1), 764*594fbe71SArnaud Ebalard G762_GEARMULT_FROM_REG(data->fan_cmd2)); 765*594fbe71SArnaud Ebalard } 766*594fbe71SArnaud Ebalard mutex_unlock(&data->update_lock); 767*594fbe71SArnaud Ebalard 768*594fbe71SArnaud Ebalard return sprintf(buf, "%u\n", rpm); 769*594fbe71SArnaud Ebalard } 770*594fbe71SArnaud Ebalard 771*594fbe71SArnaud Ebalard /* 772*594fbe71SArnaud Ebalard * Read and write functions for pwm1_mode sysfs file. Get and set fan speed 773*594fbe71SArnaud Ebalard * control mode i.e. PWM (1) or DC (0). 774*594fbe71SArnaud Ebalard */ 775*594fbe71SArnaud Ebalard static ssize_t get_pwm_mode(struct device *dev, struct device_attribute *da, 776*594fbe71SArnaud Ebalard char *buf) 777*594fbe71SArnaud Ebalard { 778*594fbe71SArnaud Ebalard struct g762_data *data = g762_update_client(dev); 779*594fbe71SArnaud Ebalard 780*594fbe71SArnaud Ebalard if (IS_ERR(data)) 781*594fbe71SArnaud Ebalard return PTR_ERR(data); 782*594fbe71SArnaud Ebalard 783*594fbe71SArnaud Ebalard return sprintf(buf, "%d\n", 784*594fbe71SArnaud Ebalard !!(data->fan_cmd1 & G762_REG_FAN_CMD1_OUT_MODE)); 785*594fbe71SArnaud Ebalard } 786*594fbe71SArnaud Ebalard 787*594fbe71SArnaud Ebalard static ssize_t set_pwm_mode(struct device *dev, struct device_attribute *da, 788*594fbe71SArnaud Ebalard const char *buf, size_t count) 789*594fbe71SArnaud Ebalard { 790*594fbe71SArnaud Ebalard unsigned long val; 791*594fbe71SArnaud Ebalard int ret; 792*594fbe71SArnaud Ebalard 793*594fbe71SArnaud Ebalard if (kstrtoul(buf, 10, &val)) 794*594fbe71SArnaud Ebalard return -EINVAL; 795*594fbe71SArnaud Ebalard 796*594fbe71SArnaud Ebalard ret = do_set_pwm_mode(dev, val); 797*594fbe71SArnaud Ebalard if (ret < 0) 798*594fbe71SArnaud Ebalard return ret; 799*594fbe71SArnaud Ebalard 800*594fbe71SArnaud Ebalard return count; 801*594fbe71SArnaud Ebalard } 802*594fbe71SArnaud Ebalard 803*594fbe71SArnaud Ebalard /* 804*594fbe71SArnaud Ebalard * Read and write functions for fan1_div sysfs file. Get and set fan 805*594fbe71SArnaud Ebalard * controller prescaler value 806*594fbe71SArnaud Ebalard */ 807*594fbe71SArnaud Ebalard static ssize_t get_fan_div(struct device *dev, 808*594fbe71SArnaud Ebalard struct device_attribute *da, char *buf) 809*594fbe71SArnaud Ebalard { 810*594fbe71SArnaud Ebalard struct g762_data *data = g762_update_client(dev); 811*594fbe71SArnaud Ebalard 812*594fbe71SArnaud Ebalard if (IS_ERR(data)) 813*594fbe71SArnaud Ebalard return PTR_ERR(data); 814*594fbe71SArnaud Ebalard 815*594fbe71SArnaud Ebalard return sprintf(buf, "%d\n", G762_CLKDIV_FROM_REG(data->fan_cmd1)); 816*594fbe71SArnaud Ebalard } 817*594fbe71SArnaud Ebalard 818*594fbe71SArnaud Ebalard static ssize_t set_fan_div(struct device *dev, 819*594fbe71SArnaud Ebalard struct device_attribute *da, 820*594fbe71SArnaud Ebalard const char *buf, size_t count) 821*594fbe71SArnaud Ebalard { 822*594fbe71SArnaud Ebalard unsigned long val; 823*594fbe71SArnaud Ebalard int ret; 824*594fbe71SArnaud Ebalard 825*594fbe71SArnaud Ebalard if (kstrtoul(buf, 10, &val)) 826*594fbe71SArnaud Ebalard return -EINVAL; 827*594fbe71SArnaud Ebalard 828*594fbe71SArnaud Ebalard ret = do_set_fan_div(dev, val); 829*594fbe71SArnaud Ebalard if (ret < 0) 830*594fbe71SArnaud Ebalard return ret; 831*594fbe71SArnaud Ebalard 832*594fbe71SArnaud Ebalard return count; 833*594fbe71SArnaud Ebalard } 834*594fbe71SArnaud Ebalard 835*594fbe71SArnaud Ebalard /* 836*594fbe71SArnaud Ebalard * Read and write functions for fan1_pulses sysfs file. Get and set number 837*594fbe71SArnaud Ebalard * of tachometer pulses per fan revolution. 838*594fbe71SArnaud Ebalard */ 839*594fbe71SArnaud Ebalard static ssize_t get_fan_pulses(struct device *dev, 840*594fbe71SArnaud Ebalard struct device_attribute *da, char *buf) 841*594fbe71SArnaud Ebalard { 842*594fbe71SArnaud Ebalard struct g762_data *data = g762_update_client(dev); 843*594fbe71SArnaud Ebalard 844*594fbe71SArnaud Ebalard if (IS_ERR(data)) 845*594fbe71SArnaud Ebalard return PTR_ERR(data); 846*594fbe71SArnaud Ebalard 847*594fbe71SArnaud Ebalard return sprintf(buf, "%d\n", G762_PULSE_FROM_REG(data->fan_cmd1)); 848*594fbe71SArnaud Ebalard } 849*594fbe71SArnaud Ebalard 850*594fbe71SArnaud Ebalard static ssize_t set_fan_pulses(struct device *dev, 851*594fbe71SArnaud Ebalard struct device_attribute *da, 852*594fbe71SArnaud Ebalard const char *buf, size_t count) 853*594fbe71SArnaud Ebalard { 854*594fbe71SArnaud Ebalard unsigned long val; 855*594fbe71SArnaud Ebalard int ret; 856*594fbe71SArnaud Ebalard 857*594fbe71SArnaud Ebalard if (kstrtoul(buf, 10, &val)) 858*594fbe71SArnaud Ebalard return -EINVAL; 859*594fbe71SArnaud Ebalard 860*594fbe71SArnaud Ebalard ret = do_set_fan_pulses(dev, val); 861*594fbe71SArnaud Ebalard if (ret < 0) 862*594fbe71SArnaud Ebalard return ret; 863*594fbe71SArnaud Ebalard 864*594fbe71SArnaud Ebalard return count; 865*594fbe71SArnaud Ebalard } 866*594fbe71SArnaud Ebalard 867*594fbe71SArnaud Ebalard /* 868*594fbe71SArnaud Ebalard * Read and write functions for pwm1_enable. Get and set fan speed control mode 869*594fbe71SArnaud Ebalard * (i.e. closed or open-loop). 870*594fbe71SArnaud Ebalard * 871*594fbe71SArnaud Ebalard * Following documentation about hwmon's sysfs interface, a pwm1_enable node 872*594fbe71SArnaud Ebalard * should accept followings: 873*594fbe71SArnaud Ebalard * 874*594fbe71SArnaud Ebalard * 0 : no fan speed control (i.e. fan at full speed) 875*594fbe71SArnaud Ebalard * 1 : manual fan speed control enabled (use pwm[1-*]) (open-loop) 876*594fbe71SArnaud Ebalard * 2+: automatic fan speed control enabled (use fan[1-*]_target) (closed-loop) 877*594fbe71SArnaud Ebalard * 878*594fbe71SArnaud Ebalard * but we do not accept 0 as this mode is not natively supported by the chip 879*594fbe71SArnaud Ebalard * and it is not emulated by g762 driver. -EINVAL is returned in this case. 880*594fbe71SArnaud Ebalard */ 881*594fbe71SArnaud Ebalard static ssize_t get_pwm_enable(struct device *dev, 882*594fbe71SArnaud Ebalard struct device_attribute *da, char *buf) 883*594fbe71SArnaud Ebalard { 884*594fbe71SArnaud Ebalard struct g762_data *data = g762_update_client(dev); 885*594fbe71SArnaud Ebalard 886*594fbe71SArnaud Ebalard if (IS_ERR(data)) 887*594fbe71SArnaud Ebalard return PTR_ERR(data); 888*594fbe71SArnaud Ebalard 889*594fbe71SArnaud Ebalard return sprintf(buf, "%d\n", 890*594fbe71SArnaud Ebalard (!!(data->fan_cmd1 & G762_REG_FAN_CMD1_FAN_MODE)) + 1); 891*594fbe71SArnaud Ebalard } 892*594fbe71SArnaud Ebalard 893*594fbe71SArnaud Ebalard static ssize_t set_pwm_enable(struct device *dev, 894*594fbe71SArnaud Ebalard struct device_attribute *da, 895*594fbe71SArnaud Ebalard const char *buf, size_t count) 896*594fbe71SArnaud Ebalard { 897*594fbe71SArnaud Ebalard unsigned long val; 898*594fbe71SArnaud Ebalard int ret; 899*594fbe71SArnaud Ebalard 900*594fbe71SArnaud Ebalard if (kstrtoul(buf, 10, &val)) 901*594fbe71SArnaud Ebalard return -EINVAL; 902*594fbe71SArnaud Ebalard 903*594fbe71SArnaud Ebalard ret = do_set_pwm_enable(dev, val); 904*594fbe71SArnaud Ebalard if (ret < 0) 905*594fbe71SArnaud Ebalard return ret; 906*594fbe71SArnaud Ebalard 907*594fbe71SArnaud Ebalard return count; 908*594fbe71SArnaud Ebalard } 909*594fbe71SArnaud Ebalard 910*594fbe71SArnaud Ebalard /* 911*594fbe71SArnaud Ebalard * Read and write functions for pwm1 sysfs file. Get and set pwm value 912*594fbe71SArnaud Ebalard * (which affects fan speed) in open-loop mode. 0 stops the fan and 255 913*594fbe71SArnaud Ebalard * makes it run at full speed. 914*594fbe71SArnaud Ebalard */ 915*594fbe71SArnaud Ebalard static ssize_t get_pwm(struct device *dev, struct device_attribute *da, 916*594fbe71SArnaud Ebalard char *buf) 917*594fbe71SArnaud Ebalard { 918*594fbe71SArnaud Ebalard struct g762_data *data = g762_update_client(dev); 919*594fbe71SArnaud Ebalard 920*594fbe71SArnaud Ebalard if (IS_ERR(data)) 921*594fbe71SArnaud Ebalard return PTR_ERR(data); 922*594fbe71SArnaud Ebalard 923*594fbe71SArnaud Ebalard return sprintf(buf, "%d\n", data->set_out); 924*594fbe71SArnaud Ebalard } 925*594fbe71SArnaud Ebalard 926*594fbe71SArnaud Ebalard static ssize_t set_pwm(struct device *dev, struct device_attribute *da, 927*594fbe71SArnaud Ebalard const char *buf, size_t count) 928*594fbe71SArnaud Ebalard { 929*594fbe71SArnaud Ebalard unsigned long val; 930*594fbe71SArnaud Ebalard int ret; 931*594fbe71SArnaud Ebalard 932*594fbe71SArnaud Ebalard if (kstrtoul(buf, 10, &val)) 933*594fbe71SArnaud Ebalard return -EINVAL; 934*594fbe71SArnaud Ebalard 935*594fbe71SArnaud Ebalard ret = do_set_pwm(dev, val); 936*594fbe71SArnaud Ebalard if (ret < 0) 937*594fbe71SArnaud Ebalard return ret; 938*594fbe71SArnaud Ebalard 939*594fbe71SArnaud Ebalard return count; 940*594fbe71SArnaud Ebalard } 941*594fbe71SArnaud Ebalard 942*594fbe71SArnaud Ebalard /* 943*594fbe71SArnaud Ebalard * Read and write function for fan1_target sysfs file. Get/set the fan speed in 944*594fbe71SArnaud Ebalard * closed-loop mode. Speed is given as a RPM value; then the chip will regulate 945*594fbe71SArnaud Ebalard * the fan speed using pulses from fan tachometer. 946*594fbe71SArnaud Ebalard * 947*594fbe71SArnaud Ebalard * Refer to rpm_from_cnt() implementation above to get info about count number 948*594fbe71SArnaud Ebalard * calculation. 949*594fbe71SArnaud Ebalard * 950*594fbe71SArnaud Ebalard * Also note that due to rounding errors it is possible that you don't read 951*594fbe71SArnaud Ebalard * back exactly the value you have set. 952*594fbe71SArnaud Ebalard */ 953*594fbe71SArnaud Ebalard static ssize_t get_fan_target(struct device *dev, struct device_attribute *da, 954*594fbe71SArnaud Ebalard char *buf) 955*594fbe71SArnaud Ebalard { 956*594fbe71SArnaud Ebalard struct g762_data *data = g762_update_client(dev); 957*594fbe71SArnaud Ebalard unsigned int rpm; 958*594fbe71SArnaud Ebalard 959*594fbe71SArnaud Ebalard if (IS_ERR(data)) 960*594fbe71SArnaud Ebalard return PTR_ERR(data); 961*594fbe71SArnaud Ebalard 962*594fbe71SArnaud Ebalard mutex_lock(&data->update_lock); 963*594fbe71SArnaud Ebalard rpm = rpm_from_cnt(data->set_cnt, data->clk_freq, 964*594fbe71SArnaud Ebalard G762_PULSE_FROM_REG(data->fan_cmd1), 965*594fbe71SArnaud Ebalard G762_CLKDIV_FROM_REG(data->fan_cmd1), 966*594fbe71SArnaud Ebalard G762_GEARMULT_FROM_REG(data->fan_cmd2)); 967*594fbe71SArnaud Ebalard mutex_unlock(&data->update_lock); 968*594fbe71SArnaud Ebalard 969*594fbe71SArnaud Ebalard return sprintf(buf, "%u\n", rpm); 970*594fbe71SArnaud Ebalard } 971*594fbe71SArnaud Ebalard 972*594fbe71SArnaud Ebalard static ssize_t set_fan_target(struct device *dev, struct device_attribute *da, 973*594fbe71SArnaud Ebalard const char *buf, size_t count) 974*594fbe71SArnaud Ebalard { 975*594fbe71SArnaud Ebalard unsigned long val; 976*594fbe71SArnaud Ebalard int ret; 977*594fbe71SArnaud Ebalard 978*594fbe71SArnaud Ebalard if (kstrtoul(buf, 10, &val)) 979*594fbe71SArnaud Ebalard return -EINVAL; 980*594fbe71SArnaud Ebalard 981*594fbe71SArnaud Ebalard ret = do_set_fan_target(dev, val); 982*594fbe71SArnaud Ebalard if (ret < 0) 983*594fbe71SArnaud Ebalard return ret; 984*594fbe71SArnaud Ebalard 985*594fbe71SArnaud Ebalard return count; 986*594fbe71SArnaud Ebalard } 987*594fbe71SArnaud Ebalard 988*594fbe71SArnaud Ebalard /* read function for fan1_fault sysfs file. */ 989*594fbe71SArnaud Ebalard static ssize_t get_fan_failure(struct device *dev, struct device_attribute *da, 990*594fbe71SArnaud Ebalard char *buf) 991*594fbe71SArnaud Ebalard { 992*594fbe71SArnaud Ebalard struct g762_data *data = g762_update_client(dev); 993*594fbe71SArnaud Ebalard 994*594fbe71SArnaud Ebalard if (IS_ERR(data)) 995*594fbe71SArnaud Ebalard return PTR_ERR(data); 996*594fbe71SArnaud Ebalard 997*594fbe71SArnaud Ebalard return sprintf(buf, "%u\n", !!(data->fan_sta & G762_REG_FAN_STA_FAIL)); 998*594fbe71SArnaud Ebalard } 999*594fbe71SArnaud Ebalard 1000*594fbe71SArnaud Ebalard /* 1001*594fbe71SArnaud Ebalard * read function for fan1_alarm sysfs file. Note that OOC condition is 1002*594fbe71SArnaud Ebalard * enabled low 1003*594fbe71SArnaud Ebalard */ 1004*594fbe71SArnaud Ebalard static ssize_t get_fan_ooc(struct device *dev, struct device_attribute *da, 1005*594fbe71SArnaud Ebalard char *buf) 1006*594fbe71SArnaud Ebalard { 1007*594fbe71SArnaud Ebalard struct g762_data *data = g762_update_client(dev); 1008*594fbe71SArnaud Ebalard 1009*594fbe71SArnaud Ebalard if (IS_ERR(data)) 1010*594fbe71SArnaud Ebalard return PTR_ERR(data); 1011*594fbe71SArnaud Ebalard 1012*594fbe71SArnaud Ebalard return sprintf(buf, "%u\n", !(data->fan_sta & G762_REG_FAN_STA_OOC)); 1013*594fbe71SArnaud Ebalard } 1014*594fbe71SArnaud Ebalard 1015*594fbe71SArnaud Ebalard static DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, get_pwm, set_pwm); 1016*594fbe71SArnaud Ebalard static DEVICE_ATTR(pwm1_mode, S_IWUSR | S_IRUGO, get_pwm_mode, set_pwm_mode); 1017*594fbe71SArnaud Ebalard static DEVICE_ATTR(pwm1_enable, S_IWUSR | S_IRUGO, 1018*594fbe71SArnaud Ebalard get_pwm_enable, set_pwm_enable); 1019*594fbe71SArnaud Ebalard static DEVICE_ATTR(fan1_input, S_IRUGO, get_fan_rpm, NULL); 1020*594fbe71SArnaud Ebalard static DEVICE_ATTR(fan1_alarm, S_IRUGO, get_fan_ooc, NULL); 1021*594fbe71SArnaud Ebalard static DEVICE_ATTR(fan1_fault, S_IRUGO, get_fan_failure, NULL); 1022*594fbe71SArnaud Ebalard static DEVICE_ATTR(fan1_target, S_IWUSR | S_IRUGO, 1023*594fbe71SArnaud Ebalard get_fan_target, set_fan_target); 1024*594fbe71SArnaud Ebalard static DEVICE_ATTR(fan1_div, S_IWUSR | S_IRUGO, get_fan_div, set_fan_div); 1025*594fbe71SArnaud Ebalard static DEVICE_ATTR(fan1_pulses, S_IWUSR | S_IRUGO, 1026*594fbe71SArnaud Ebalard get_fan_pulses, set_fan_pulses); 1027*594fbe71SArnaud Ebalard 1028*594fbe71SArnaud Ebalard /* Driver data */ 1029*594fbe71SArnaud Ebalard static struct attribute *g762_attributes[] = { 1030*594fbe71SArnaud Ebalard &dev_attr_fan1_input.attr, 1031*594fbe71SArnaud Ebalard &dev_attr_fan1_alarm.attr, 1032*594fbe71SArnaud Ebalard &dev_attr_fan1_fault.attr, 1033*594fbe71SArnaud Ebalard &dev_attr_fan1_target.attr, 1034*594fbe71SArnaud Ebalard &dev_attr_fan1_div.attr, 1035*594fbe71SArnaud Ebalard &dev_attr_fan1_pulses.attr, 1036*594fbe71SArnaud Ebalard &dev_attr_pwm1.attr, 1037*594fbe71SArnaud Ebalard &dev_attr_pwm1_mode.attr, 1038*594fbe71SArnaud Ebalard &dev_attr_pwm1_enable.attr, 1039*594fbe71SArnaud Ebalard NULL 1040*594fbe71SArnaud Ebalard }; 1041*594fbe71SArnaud Ebalard 1042*594fbe71SArnaud Ebalard static const struct attribute_group g762_group = { 1043*594fbe71SArnaud Ebalard .attrs = g762_attributes, 1044*594fbe71SArnaud Ebalard }; 1045*594fbe71SArnaud Ebalard 1046*594fbe71SArnaud Ebalard /* 1047*594fbe71SArnaud Ebalard * Enable both fan failure detection and fan out of control protection. The 1048*594fbe71SArnaud Ebalard * function does not protect change/access to data structure; it must thus 1049*594fbe71SArnaud Ebalard * only be called during initialization. 1050*594fbe71SArnaud Ebalard */ 1051*594fbe71SArnaud Ebalard static inline int g762_fan_init(struct device *dev) 1052*594fbe71SArnaud Ebalard { 1053*594fbe71SArnaud Ebalard struct i2c_client *client = to_i2c_client(dev); 1054*594fbe71SArnaud Ebalard struct g762_data *data = g762_update_client(dev); 1055*594fbe71SArnaud Ebalard 1056*594fbe71SArnaud Ebalard if (IS_ERR(data)) 1057*594fbe71SArnaud Ebalard return PTR_ERR(data); 1058*594fbe71SArnaud Ebalard 1059*594fbe71SArnaud Ebalard data->fan_cmd1 |= G762_REG_FAN_CMD1_DET_FAN_FAIL; 1060*594fbe71SArnaud Ebalard data->fan_cmd1 |= G762_REG_FAN_CMD1_DET_FAN_OOC; 1061*594fbe71SArnaud Ebalard data->valid = false; 1062*594fbe71SArnaud Ebalard 1063*594fbe71SArnaud Ebalard return i2c_smbus_write_byte_data(client, G762_REG_FAN_CMD1, 1064*594fbe71SArnaud Ebalard data->fan_cmd1); 1065*594fbe71SArnaud Ebalard } 1066*594fbe71SArnaud Ebalard 1067*594fbe71SArnaud Ebalard static int g762_probe(struct i2c_client *client, const struct i2c_device_id *id) 1068*594fbe71SArnaud Ebalard { 1069*594fbe71SArnaud Ebalard struct g762_data *data; 1070*594fbe71SArnaud Ebalard int ret; 1071*594fbe71SArnaud Ebalard 1072*594fbe71SArnaud Ebalard if (!i2c_check_functionality(client->adapter, 1073*594fbe71SArnaud Ebalard I2C_FUNC_SMBUS_BYTE_DATA)) 1074*594fbe71SArnaud Ebalard return -ENODEV; 1075*594fbe71SArnaud Ebalard 1076*594fbe71SArnaud Ebalard data = devm_kzalloc(&client->dev, sizeof(struct g762_data), GFP_KERNEL); 1077*594fbe71SArnaud Ebalard if (!data) 1078*594fbe71SArnaud Ebalard return -ENOMEM; 1079*594fbe71SArnaud Ebalard 1080*594fbe71SArnaud Ebalard i2c_set_clientdata(client, data); 1081*594fbe71SArnaud Ebalard data->client = client; 1082*594fbe71SArnaud Ebalard mutex_init(&data->update_lock); 1083*594fbe71SArnaud Ebalard 1084*594fbe71SArnaud Ebalard /* Enable fan failure detection and fan out of control protection */ 1085*594fbe71SArnaud Ebalard ret = g762_fan_init(&client->dev); 1086*594fbe71SArnaud Ebalard if (ret) 1087*594fbe71SArnaud Ebalard return ret; 1088*594fbe71SArnaud Ebalard 1089*594fbe71SArnaud Ebalard /* Get configuration via DT ... */ 1090*594fbe71SArnaud Ebalard ret = g762_of_clock_enable(client); 1091*594fbe71SArnaud Ebalard if (ret) 1092*594fbe71SArnaud Ebalard return ret; 1093*594fbe71SArnaud Ebalard ret = g762_of_prop_import(client); 1094*594fbe71SArnaud Ebalard if (ret) 1095*594fbe71SArnaud Ebalard goto clock_dis; 1096*594fbe71SArnaud Ebalard /* ... or platform_data */ 1097*594fbe71SArnaud Ebalard ret = g762_pdata_prop_import(client); 1098*594fbe71SArnaud Ebalard if (ret) 1099*594fbe71SArnaud Ebalard goto clock_dis; 1100*594fbe71SArnaud Ebalard 1101*594fbe71SArnaud Ebalard /* Register sysfs hooks */ 1102*594fbe71SArnaud Ebalard ret = sysfs_create_group(&client->dev.kobj, &g762_group); 1103*594fbe71SArnaud Ebalard if (ret) 1104*594fbe71SArnaud Ebalard goto clock_dis; 1105*594fbe71SArnaud Ebalard 1106*594fbe71SArnaud Ebalard data->hwmon_dev = hwmon_device_register(&client->dev); 1107*594fbe71SArnaud Ebalard if (IS_ERR(data->hwmon_dev)) { 1108*594fbe71SArnaud Ebalard ret = PTR_ERR(data->hwmon_dev); 1109*594fbe71SArnaud Ebalard goto sysfs_rem; 1110*594fbe71SArnaud Ebalard } 1111*594fbe71SArnaud Ebalard 1112*594fbe71SArnaud Ebalard return 0; 1113*594fbe71SArnaud Ebalard 1114*594fbe71SArnaud Ebalard sysfs_rem: 1115*594fbe71SArnaud Ebalard sysfs_remove_group(&client->dev.kobj, &g762_group); 1116*594fbe71SArnaud Ebalard 1117*594fbe71SArnaud Ebalard clock_dis: 1118*594fbe71SArnaud Ebalard g762_of_clock_disable(client); 1119*594fbe71SArnaud Ebalard 1120*594fbe71SArnaud Ebalard return ret; 1121*594fbe71SArnaud Ebalard } 1122*594fbe71SArnaud Ebalard 1123*594fbe71SArnaud Ebalard static int g762_remove(struct i2c_client *client) 1124*594fbe71SArnaud Ebalard { 1125*594fbe71SArnaud Ebalard struct g762_data *data = i2c_get_clientdata(client); 1126*594fbe71SArnaud Ebalard 1127*594fbe71SArnaud Ebalard hwmon_device_unregister(data->hwmon_dev); 1128*594fbe71SArnaud Ebalard sysfs_remove_group(&client->dev.kobj, &g762_group); 1129*594fbe71SArnaud Ebalard g762_of_clock_disable(client); 1130*594fbe71SArnaud Ebalard 1131*594fbe71SArnaud Ebalard return 0; 1132*594fbe71SArnaud Ebalard } 1133*594fbe71SArnaud Ebalard 1134*594fbe71SArnaud Ebalard static struct i2c_driver g762_driver = { 1135*594fbe71SArnaud Ebalard .driver = { 1136*594fbe71SArnaud Ebalard .name = DRVNAME, 1137*594fbe71SArnaud Ebalard .owner = THIS_MODULE, 1138*594fbe71SArnaud Ebalard .of_match_table = of_match_ptr(g762_dt_match), 1139*594fbe71SArnaud Ebalard }, 1140*594fbe71SArnaud Ebalard .probe = g762_probe, 1141*594fbe71SArnaud Ebalard .remove = g762_remove, 1142*594fbe71SArnaud Ebalard .id_table = g762_id, 1143*594fbe71SArnaud Ebalard }; 1144*594fbe71SArnaud Ebalard 1145*594fbe71SArnaud Ebalard module_i2c_driver(g762_driver); 1146*594fbe71SArnaud Ebalard 1147*594fbe71SArnaud Ebalard MODULE_AUTHOR("Arnaud EBALARD <arno@natisbad.org>"); 1148*594fbe71SArnaud Ebalard MODULE_DESCRIPTION("GMT G762/G763 driver"); 1149*594fbe71SArnaud Ebalard MODULE_LICENSE("GPL"); 1150