Arnaud Ebalard | 594fbe7 | 2013-06-20 22:21:04 +0200 | [diff] [blame] | 1 | /* |
| 2 | * g762 - Driver for the Global Mixed-mode Technology Inc. fan speed |
| 3 | * PWM controller chips from G762 family, i.e. G762 and G763 |
| 4 | * |
| 5 | * Copyright (C) 2013, Arnaud EBALARD <arno@natisbad.org> |
| 6 | * |
| 7 | * This work is based on a basic version for 2.6.31 kernel developed |
| 8 | * by Olivier Mouchet for LaCie. Updates and correction have been |
| 9 | * performed to run on recent kernels. Additional features, like the |
| 10 | * ability to configure various characteristics via .dts file or |
| 11 | * board init file have been added. Detailed datasheet on which this |
| 12 | * development is based is available here: |
| 13 | * |
| 14 | * http://natisbad.org/NAS/refs/GMT_EDS-762_763-080710-0.2.pdf |
| 15 | * |
| 16 | * Headers from previous developments have been kept below: |
| 17 | * |
| 18 | * Copyright (c) 2009 LaCie |
| 19 | * |
| 20 | * Author: Olivier Mouchet <olivier.mouchet@gmail.com> |
| 21 | * |
| 22 | * based on g760a code written by Herbert Valerio Riedel <hvr@gnu.org> |
| 23 | * Copyright (C) 2007 Herbert Valerio Riedel <hvr@gnu.org> |
| 24 | * |
| 25 | * g762: minimal datasheet available at: |
| 26 | * http://www.gmt.com.tw/product/datasheet/EDS-762_3.pdf |
| 27 | * |
| 28 | * This program is free software; you can redistribute it and/or modify |
| 29 | * it under the terms of the GNU General Public License as published by |
| 30 | * the Free Software Foundation; either version 2 of the License, or |
| 31 | * (at your option) any later version. |
| 32 | * |
| 33 | * This program is distributed in the hope that it will be useful, |
| 34 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 35 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 36 | * GNU General Public License for more details. |
| 37 | * |
| 38 | * You should have received a copy of the GNU General Public License |
| 39 | * along with this program; if not, write to the Free Software |
| 40 | * Foundation. |
| 41 | */ |
| 42 | |
| 43 | #include <linux/device.h> |
| 44 | #include <linux/module.h> |
| 45 | #include <linux/init.h> |
| 46 | #include <linux/jiffies.h> |
| 47 | #include <linux/i2c.h> |
| 48 | #include <linux/hwmon.h> |
| 49 | #include <linux/hwmon-sysfs.h> |
| 50 | #include <linux/err.h> |
| 51 | #include <linux/mutex.h> |
| 52 | #include <linux/kernel.h> |
| 53 | #include <linux/clk.h> |
| 54 | #include <linux/of.h> |
| 55 | #include <linux/of_device.h> |
| 56 | #include <linux/platform_data/g762.h> |
| 57 | |
| 58 | #define DRVNAME "g762" |
| 59 | |
| 60 | static const struct i2c_device_id g762_id[] = { |
| 61 | { "g762", 0 }, |
| 62 | { "g763", 0 }, |
| 63 | { } |
| 64 | }; |
| 65 | MODULE_DEVICE_TABLE(i2c, g762_id); |
| 66 | |
| 67 | enum g762_regs { |
| 68 | G762_REG_SET_CNT = 0x00, |
| 69 | G762_REG_ACT_CNT = 0x01, |
| 70 | G762_REG_FAN_STA = 0x02, |
| 71 | G762_REG_SET_OUT = 0x03, |
| 72 | G762_REG_FAN_CMD1 = 0x04, |
| 73 | G762_REG_FAN_CMD2 = 0x05, |
| 74 | }; |
| 75 | |
| 76 | /* Config register bits */ |
| 77 | #define G762_REG_FAN_CMD1_DET_FAN_FAIL 0x80 /* enable fan_fail signal */ |
| 78 | #define G762_REG_FAN_CMD1_DET_FAN_OOC 0x40 /* enable fan_out_of_control */ |
| 79 | #define G762_REG_FAN_CMD1_OUT_MODE 0x20 /* out mode: PWM or DC */ |
| 80 | #define G762_REG_FAN_CMD1_FAN_MODE 0x10 /* fan mode: closed/open-loop */ |
| 81 | #define G762_REG_FAN_CMD1_CLK_DIV_ID1 0x08 /* clock divisor value */ |
| 82 | #define G762_REG_FAN_CMD1_CLK_DIV_ID0 0x04 |
| 83 | #define G762_REG_FAN_CMD1_PWM_POLARITY 0x02 /* PWM polarity */ |
| 84 | #define G762_REG_FAN_CMD1_PULSE_PER_REV 0x01 /* pulse per fan revolution */ |
| 85 | |
| 86 | #define G762_REG_FAN_CMD2_GEAR_MODE_1 0x08 /* fan gear mode */ |
| 87 | #define G762_REG_FAN_CMD2_GEAR_MODE_0 0x04 |
| 88 | #define G762_REG_FAN_CMD2_FAN_STARTV_1 0x02 /* fan startup voltage */ |
| 89 | #define G762_REG_FAN_CMD2_FAN_STARTV_0 0x01 |
| 90 | |
| 91 | #define G762_REG_FAN_STA_FAIL 0x02 /* fan fail */ |
| 92 | #define G762_REG_FAN_STA_OOC 0x01 /* fan out of control */ |
| 93 | |
| 94 | /* Config register values */ |
| 95 | #define G762_OUT_MODE_PWM 1 |
| 96 | #define G762_OUT_MODE_DC 0 |
| 97 | |
| 98 | #define G762_FAN_MODE_CLOSED_LOOP 2 |
| 99 | #define G762_FAN_MODE_OPEN_LOOP 1 |
| 100 | |
| 101 | #define G762_PWM_POLARITY_NEGATIVE 1 |
| 102 | #define G762_PWM_POLARITY_POSITIVE 0 |
| 103 | |
| 104 | /* Register data is read (and cached) at most once per second. */ |
| 105 | #define G762_UPDATE_INTERVAL HZ |
| 106 | |
| 107 | /* |
| 108 | * Extract pulse count per fan revolution value (2 or 4) from given |
| 109 | * FAN_CMD1 register value. |
| 110 | */ |
| 111 | #define G762_PULSE_FROM_REG(reg) \ |
| 112 | ((((reg) & G762_REG_FAN_CMD1_PULSE_PER_REV) + 1) << 1) |
| 113 | |
| 114 | /* |
| 115 | * Extract fan clock divisor (1, 2, 4 or 8) from given FAN_CMD1 |
| 116 | * register value. |
| 117 | */ |
| 118 | #define G762_CLKDIV_FROM_REG(reg) \ |
| 119 | (1 << (((reg) & (G762_REG_FAN_CMD1_CLK_DIV_ID0 | \ |
| 120 | G762_REG_FAN_CMD1_CLK_DIV_ID1)) >> 2)) |
| 121 | |
| 122 | /* |
| 123 | * Extract fan gear mode multiplier value (0, 2 or 4) from given |
| 124 | * FAN_CMD2 register value. |
| 125 | */ |
| 126 | #define G762_GEARMULT_FROM_REG(reg) \ |
| 127 | (1 << (((reg) & (G762_REG_FAN_CMD2_GEAR_MODE_0 | \ |
| 128 | G762_REG_FAN_CMD2_GEAR_MODE_1)) >> 2)) |
| 129 | |
| 130 | struct g762_data { |
| 131 | struct i2c_client *client; |
| 132 | struct device *hwmon_dev; |
| 133 | struct clk *clk; |
| 134 | |
| 135 | /* update mutex */ |
| 136 | struct mutex update_lock; |
| 137 | |
| 138 | /* board specific parameters. */ |
| 139 | u32 clk_freq; |
| 140 | |
| 141 | /* g762 register cache */ |
| 142 | bool valid; |
| 143 | unsigned long last_updated; /* in jiffies */ |
| 144 | |
| 145 | u8 set_cnt; /* controls fan rotation speed in closed-loop mode */ |
| 146 | u8 act_cnt; /* provides access to current fan RPM value */ |
| 147 | u8 fan_sta; /* bit 0: set when actual fan speed is more than |
| 148 | * 25% outside requested fan speed |
| 149 | * bit 1: set when no transition occurs on fan |
| 150 | * pin for 0.7s |
| 151 | */ |
| 152 | u8 set_out; /* controls fan rotation speed in open-loop mode */ |
| 153 | u8 fan_cmd1; /* 0: FG_PLS_ID0 FG pulses count per revolution |
| 154 | * 0: 2 counts per revolution |
| 155 | * 1: 4 counts per revolution |
| 156 | * 1: PWM_POLARITY 1: negative_duty |
| 157 | * 0: positive_duty |
| 158 | * 2,3: [FG_CLOCK_ID0, FG_CLK_ID1] |
| 159 | * 00: Divide fan clock by 1 |
| 160 | * 01: Divide fan clock by 2 |
| 161 | * 10: Divide fan clock by 4 |
| 162 | * 11: Divide fan clock by 8 |
| 163 | * 4: FAN_MODE 1:closed-loop, 0:open-loop |
| 164 | * 5: OUT_MODE 1:PWM, 0:DC |
| 165 | * 6: DET_FAN_OOC enable "fan ooc" status |
| 166 | * 7: DET_FAN_FAIL enable "fan fail" status |
| 167 | */ |
| 168 | u8 fan_cmd2; /* 0,1: FAN_STARTV 0,1,2,3 -> 0,32,64,96 dac_code |
| 169 | * 2,3: FG_GEAR_MODE |
| 170 | * 00: multiplier = 1 |
| 171 | * 01: multiplier = 2 |
| 172 | * 10: multiplier = 4 |
| 173 | * 4: Mask ALERT# (g763 only) |
| 174 | */ |
| 175 | }; |
| 176 | |
| 177 | /* |
| 178 | * Convert count value from fan controller register (FAN_SET_CNT) into fan |
| 179 | * speed RPM value. Note that the datasheet documents a basic formula; |
| 180 | * influence of additional parameters (fan clock divisor, fan gear mode) |
| 181 | * have been infered from examples in the datasheet and tests. |
| 182 | */ |
| 183 | static inline unsigned int rpm_from_cnt(u8 cnt, u32 clk_freq, u16 p, |
| 184 | u8 clk_div, u8 gear_mult) |
| 185 | { |
| 186 | if (cnt == 0xff) /* setting cnt to 255 stops the fan */ |
| 187 | return 0; |
| 188 | |
| 189 | return (clk_freq * 30 * gear_mult) / ((cnt ? cnt : 1) * p * clk_div); |
| 190 | } |
| 191 | |
| 192 | /* |
| 193 | * Convert fan RPM value from sysfs into count value for fan controller |
| 194 | * register (FAN_SET_CNT). |
| 195 | */ |
| 196 | static inline unsigned char cnt_from_rpm(u32 rpm, u32 clk_freq, u16 p, |
| 197 | u8 clk_div, u8 gear_mult) |
| 198 | { |
| 199 | if (!rpm) /* to stop the fan, set cnt to 255 */ |
| 200 | return 0xff; |
| 201 | |
| 202 | return clamp_val(((clk_freq * 30 * gear_mult) / (rpm * p * clk_div)), |
| 203 | 0, 255); |
| 204 | } |
| 205 | |
| 206 | /* helper to grab and cache data, at most one time per second */ |
| 207 | static struct g762_data *g762_update_client(struct device *dev) |
| 208 | { |
| 209 | struct i2c_client *client = to_i2c_client(dev); |
| 210 | struct g762_data *data = i2c_get_clientdata(client); |
| 211 | int ret = 0; |
| 212 | |
| 213 | mutex_lock(&data->update_lock); |
| 214 | if (time_before(jiffies, data->last_updated + G762_UPDATE_INTERVAL) && |
| 215 | likely(data->valid)) |
| 216 | goto out; |
| 217 | |
| 218 | ret = i2c_smbus_read_byte_data(client, G762_REG_SET_CNT); |
| 219 | if (ret < 0) |
| 220 | goto out; |
| 221 | data->set_cnt = ret; |
| 222 | |
| 223 | ret = i2c_smbus_read_byte_data(client, G762_REG_ACT_CNT); |
| 224 | if (ret < 0) |
| 225 | goto out; |
| 226 | data->act_cnt = ret; |
| 227 | |
| 228 | ret = i2c_smbus_read_byte_data(client, G762_REG_FAN_STA); |
| 229 | if (ret < 0) |
| 230 | goto out; |
| 231 | data->fan_sta = ret; |
| 232 | |
| 233 | ret = i2c_smbus_read_byte_data(client, G762_REG_SET_OUT); |
| 234 | if (ret < 0) |
| 235 | goto out; |
| 236 | data->set_out = ret; |
| 237 | |
| 238 | ret = i2c_smbus_read_byte_data(client, G762_REG_FAN_CMD1); |
| 239 | if (ret < 0) |
| 240 | goto out; |
| 241 | data->fan_cmd1 = ret; |
| 242 | |
| 243 | ret = i2c_smbus_read_byte_data(client, G762_REG_FAN_CMD2); |
| 244 | if (ret < 0) |
| 245 | goto out; |
| 246 | data->fan_cmd2 = ret; |
| 247 | |
| 248 | data->last_updated = jiffies; |
| 249 | data->valid = true; |
| 250 | out: |
| 251 | mutex_unlock(&data->update_lock); |
| 252 | |
| 253 | if (ret < 0) /* upon error, encode it in return value */ |
| 254 | data = ERR_PTR(ret); |
| 255 | |
| 256 | return data; |
| 257 | } |
| 258 | |
| 259 | /* helpers for writing hardware parameters */ |
| 260 | |
| 261 | /* |
| 262 | * Set input clock frequency received on CLK pin of the chip. Accepted values |
| 263 | * are between 0 and 0xffffff. If zero is given, then default frequency |
| 264 | * (32,768Hz) is used. Note that clock frequency is a characteristic of the |
| 265 | * system but an internal parameter, i.e. value is not passed to the device. |
| 266 | */ |
| 267 | static int do_set_clk_freq(struct device *dev, unsigned long val) |
| 268 | { |
| 269 | struct i2c_client *client = to_i2c_client(dev); |
| 270 | struct g762_data *data = i2c_get_clientdata(client); |
| 271 | |
| 272 | if (val > 0xffffff) |
| 273 | return -EINVAL; |
| 274 | if (!val) |
| 275 | val = 32768; |
| 276 | |
| 277 | data->clk_freq = val; |
| 278 | |
| 279 | return 0; |
| 280 | } |
| 281 | |
| 282 | /* Set pwm mode. Accepts either 0 (PWM mode) or 1 (DC mode) */ |
| 283 | static int do_set_pwm_mode(struct device *dev, unsigned long val) |
| 284 | { |
| 285 | struct i2c_client *client = to_i2c_client(dev); |
| 286 | struct g762_data *data = g762_update_client(dev); |
| 287 | int ret; |
| 288 | |
| 289 | if (IS_ERR(data)) |
| 290 | return PTR_ERR(data); |
| 291 | |
| 292 | mutex_lock(&data->update_lock); |
| 293 | switch (val) { |
| 294 | case G762_OUT_MODE_PWM: |
| 295 | data->fan_cmd1 |= G762_REG_FAN_CMD1_OUT_MODE; |
| 296 | break; |
| 297 | case G762_OUT_MODE_DC: |
| 298 | data->fan_cmd1 &= ~G762_REG_FAN_CMD1_OUT_MODE; |
| 299 | break; |
| 300 | default: |
| 301 | ret = -EINVAL; |
| 302 | goto out; |
| 303 | } |
| 304 | ret = i2c_smbus_write_byte_data(client, G762_REG_FAN_CMD1, |
| 305 | data->fan_cmd1); |
| 306 | data->valid = false; |
| 307 | out: |
| 308 | mutex_unlock(&data->update_lock); |
| 309 | |
| 310 | return ret; |
| 311 | } |
| 312 | |
| 313 | /* Set fan clock divisor. Accepts either 1, 2, 4 or 8. */ |
| 314 | static int do_set_fan_div(struct device *dev, unsigned long val) |
| 315 | { |
| 316 | struct i2c_client *client = to_i2c_client(dev); |
| 317 | struct g762_data *data = g762_update_client(dev); |
| 318 | int ret; |
| 319 | |
| 320 | if (IS_ERR(data)) |
| 321 | return PTR_ERR(data); |
| 322 | |
| 323 | mutex_lock(&data->update_lock); |
| 324 | switch (val) { |
| 325 | case 1: |
| 326 | data->fan_cmd1 &= ~G762_REG_FAN_CMD1_CLK_DIV_ID0; |
| 327 | data->fan_cmd1 &= ~G762_REG_FAN_CMD1_CLK_DIV_ID1; |
| 328 | break; |
| 329 | case 2: |
| 330 | data->fan_cmd1 |= G762_REG_FAN_CMD1_CLK_DIV_ID0; |
| 331 | data->fan_cmd1 &= ~G762_REG_FAN_CMD1_CLK_DIV_ID1; |
| 332 | break; |
| 333 | case 4: |
| 334 | data->fan_cmd1 &= ~G762_REG_FAN_CMD1_CLK_DIV_ID0; |
| 335 | data->fan_cmd1 |= G762_REG_FAN_CMD1_CLK_DIV_ID1; |
| 336 | break; |
| 337 | case 8: |
| 338 | data->fan_cmd1 |= G762_REG_FAN_CMD1_CLK_DIV_ID0; |
| 339 | data->fan_cmd1 |= G762_REG_FAN_CMD1_CLK_DIV_ID1; |
| 340 | break; |
| 341 | default: |
| 342 | ret = -EINVAL; |
| 343 | goto out; |
| 344 | } |
| 345 | ret = i2c_smbus_write_byte_data(client, G762_REG_FAN_CMD1, |
| 346 | data->fan_cmd1); |
| 347 | data->valid = false; |
| 348 | out: |
| 349 | mutex_unlock(&data->update_lock); |
| 350 | |
| 351 | return ret; |
| 352 | } |
| 353 | |
| 354 | /* Set fan gear mode. Accepts either 0, 1 or 2. */ |
| 355 | static int do_set_fan_gear_mode(struct device *dev, unsigned long val) |
| 356 | { |
| 357 | struct i2c_client *client = to_i2c_client(dev); |
| 358 | struct g762_data *data = g762_update_client(dev); |
| 359 | int ret; |
| 360 | |
| 361 | if (IS_ERR(data)) |
| 362 | return PTR_ERR(data); |
| 363 | |
| 364 | mutex_lock(&data->update_lock); |
| 365 | switch (val) { |
| 366 | case 0: |
| 367 | data->fan_cmd2 &= ~G762_REG_FAN_CMD2_GEAR_MODE_0; |
| 368 | data->fan_cmd2 &= ~G762_REG_FAN_CMD2_GEAR_MODE_1; |
| 369 | break; |
| 370 | case 1: |
| 371 | data->fan_cmd2 |= G762_REG_FAN_CMD2_GEAR_MODE_0; |
| 372 | data->fan_cmd2 &= ~G762_REG_FAN_CMD2_GEAR_MODE_1; |
| 373 | break; |
| 374 | case 2: |
| 375 | data->fan_cmd2 &= ~G762_REG_FAN_CMD2_GEAR_MODE_0; |
| 376 | data->fan_cmd2 |= G762_REG_FAN_CMD2_GEAR_MODE_1; |
| 377 | break; |
| 378 | default: |
| 379 | ret = -EINVAL; |
| 380 | goto out; |
| 381 | } |
| 382 | ret = i2c_smbus_write_byte_data(client, G762_REG_FAN_CMD2, |
| 383 | data->fan_cmd2); |
| 384 | data->valid = false; |
| 385 | out: |
| 386 | mutex_unlock(&data->update_lock); |
| 387 | |
| 388 | return ret; |
| 389 | } |
| 390 | |
| 391 | /* Set number of fan pulses per revolution. Accepts either 2 or 4. */ |
| 392 | static int do_set_fan_pulses(struct device *dev, unsigned long val) |
| 393 | { |
| 394 | struct i2c_client *client = to_i2c_client(dev); |
| 395 | struct g762_data *data = g762_update_client(dev); |
| 396 | int ret; |
| 397 | |
| 398 | if (IS_ERR(data)) |
| 399 | return PTR_ERR(data); |
| 400 | |
| 401 | mutex_lock(&data->update_lock); |
| 402 | switch (val) { |
| 403 | case 2: |
| 404 | data->fan_cmd1 &= ~G762_REG_FAN_CMD1_PULSE_PER_REV; |
| 405 | break; |
| 406 | case 4: |
| 407 | data->fan_cmd1 |= G762_REG_FAN_CMD1_PULSE_PER_REV; |
| 408 | break; |
| 409 | default: |
| 410 | ret = -EINVAL; |
| 411 | goto out; |
| 412 | } |
| 413 | ret = i2c_smbus_write_byte_data(client, G762_REG_FAN_CMD1, |
| 414 | data->fan_cmd1); |
| 415 | data->valid = false; |
| 416 | out: |
| 417 | mutex_unlock(&data->update_lock); |
| 418 | |
| 419 | return ret; |
| 420 | } |
| 421 | |
| 422 | /* Set fan mode. Accepts either 1 (open-loop) or 2 (closed-loop). */ |
| 423 | static int do_set_pwm_enable(struct device *dev, unsigned long val) |
| 424 | { |
| 425 | struct i2c_client *client = to_i2c_client(dev); |
| 426 | struct g762_data *data = g762_update_client(dev); |
| 427 | int ret; |
| 428 | |
| 429 | if (IS_ERR(data)) |
| 430 | return PTR_ERR(data); |
| 431 | |
| 432 | mutex_lock(&data->update_lock); |
| 433 | switch (val) { |
| 434 | case G762_FAN_MODE_CLOSED_LOOP: |
| 435 | data->fan_cmd1 |= G762_REG_FAN_CMD1_FAN_MODE; |
| 436 | break; |
| 437 | case G762_FAN_MODE_OPEN_LOOP: |
| 438 | data->fan_cmd1 &= ~G762_REG_FAN_CMD1_FAN_MODE; |
| 439 | /* |
| 440 | * BUG FIX: if SET_CNT register value is 255 then, for some |
| 441 | * unknown reason, fan will not rotate as expected, no matter |
| 442 | * the value of SET_OUT (to be specific, this seems to happen |
| 443 | * only in PWM mode). To workaround this bug, we give SET_CNT |
| 444 | * value of 254 if it is 255 when switching to open-loop. |
| 445 | */ |
| 446 | if (data->set_cnt == 0xff) |
| 447 | i2c_smbus_write_byte_data(client, G762_REG_SET_CNT, |
| 448 | 254); |
| 449 | break; |
| 450 | default: |
| 451 | ret = -EINVAL; |
| 452 | goto out; |
| 453 | } |
| 454 | |
| 455 | ret = i2c_smbus_write_byte_data(client, G762_REG_FAN_CMD1, |
| 456 | data->fan_cmd1); |
| 457 | data->valid = false; |
| 458 | out: |
| 459 | mutex_unlock(&data->update_lock); |
| 460 | |
| 461 | return ret; |
| 462 | } |
| 463 | |
| 464 | /* Set PWM polarity. Accepts either 0 (positive duty) or 1 (negative duty) */ |
| 465 | static int do_set_pwm_polarity(struct device *dev, unsigned long val) |
| 466 | { |
| 467 | struct i2c_client *client = to_i2c_client(dev); |
| 468 | struct g762_data *data = g762_update_client(dev); |
| 469 | int ret; |
| 470 | |
| 471 | if (IS_ERR(data)) |
| 472 | return PTR_ERR(data); |
| 473 | |
| 474 | mutex_lock(&data->update_lock); |
| 475 | switch (val) { |
| 476 | case G762_PWM_POLARITY_POSITIVE: |
| 477 | data->fan_cmd1 &= ~G762_REG_FAN_CMD1_PWM_POLARITY; |
| 478 | break; |
| 479 | case G762_PWM_POLARITY_NEGATIVE: |
| 480 | data->fan_cmd1 |= G762_REG_FAN_CMD1_PWM_POLARITY; |
| 481 | break; |
| 482 | default: |
| 483 | ret = -EINVAL; |
| 484 | goto out; |
| 485 | } |
| 486 | ret = i2c_smbus_write_byte_data(client, G762_REG_FAN_CMD1, |
| 487 | data->fan_cmd1); |
| 488 | data->valid = false; |
| 489 | out: |
| 490 | mutex_unlock(&data->update_lock); |
| 491 | |
| 492 | return ret; |
| 493 | } |
| 494 | |
| 495 | /* |
| 496 | * Set pwm value. Accepts values between 0 (stops the fan) and |
| 497 | * 255 (full speed). This only makes sense in open-loop mode. |
| 498 | */ |
| 499 | static int do_set_pwm(struct device *dev, unsigned long val) |
| 500 | { |
| 501 | struct i2c_client *client = to_i2c_client(dev); |
| 502 | struct g762_data *data = i2c_get_clientdata(client); |
| 503 | int ret; |
| 504 | |
| 505 | if (val > 255) |
| 506 | return -EINVAL; |
| 507 | |
| 508 | mutex_lock(&data->update_lock); |
| 509 | ret = i2c_smbus_write_byte_data(client, G762_REG_SET_OUT, val); |
| 510 | data->valid = false; |
| 511 | mutex_unlock(&data->update_lock); |
| 512 | |
| 513 | return ret; |
| 514 | } |
| 515 | |
| 516 | /* |
| 517 | * Set fan RPM value. Can be called both in closed and open-loop mode |
| 518 | * but effect will only be seen after closed-loop mode is configured. |
| 519 | */ |
| 520 | static int do_set_fan_target(struct device *dev, unsigned long val) |
| 521 | { |
| 522 | struct i2c_client *client = to_i2c_client(dev); |
| 523 | struct g762_data *data = g762_update_client(dev); |
| 524 | int ret; |
| 525 | |
| 526 | if (IS_ERR(data)) |
| 527 | return PTR_ERR(data); |
| 528 | |
| 529 | mutex_lock(&data->update_lock); |
| 530 | data->set_cnt = cnt_from_rpm(val, data->clk_freq, |
| 531 | G762_PULSE_FROM_REG(data->fan_cmd1), |
| 532 | G762_CLKDIV_FROM_REG(data->fan_cmd1), |
| 533 | G762_GEARMULT_FROM_REG(data->fan_cmd2)); |
| 534 | ret = i2c_smbus_write_byte_data(client, G762_REG_SET_CNT, |
| 535 | data->set_cnt); |
| 536 | data->valid = false; |
| 537 | mutex_unlock(&data->update_lock); |
| 538 | |
| 539 | return ret; |
| 540 | } |
| 541 | |
| 542 | /* Set fan startup voltage. Accepted values are either 0, 1, 2 or 3. */ |
| 543 | static int do_set_fan_startv(struct device *dev, unsigned long val) |
| 544 | { |
| 545 | struct i2c_client *client = to_i2c_client(dev); |
| 546 | struct g762_data *data = g762_update_client(dev); |
| 547 | int ret; |
| 548 | |
| 549 | if (IS_ERR(data)) |
| 550 | return PTR_ERR(data); |
| 551 | |
| 552 | mutex_lock(&data->update_lock); |
| 553 | switch (val) { |
| 554 | case 0: |
| 555 | data->fan_cmd2 &= ~G762_REG_FAN_CMD2_FAN_STARTV_0; |
| 556 | data->fan_cmd2 &= ~G762_REG_FAN_CMD2_FAN_STARTV_1; |
| 557 | break; |
| 558 | case 1: |
| 559 | data->fan_cmd2 |= G762_REG_FAN_CMD2_FAN_STARTV_0; |
| 560 | data->fan_cmd2 &= ~G762_REG_FAN_CMD2_FAN_STARTV_1; |
| 561 | break; |
| 562 | case 2: |
| 563 | data->fan_cmd2 &= ~G762_REG_FAN_CMD2_FAN_STARTV_0; |
| 564 | data->fan_cmd2 |= G762_REG_FAN_CMD2_FAN_STARTV_1; |
| 565 | break; |
| 566 | case 3: |
| 567 | data->fan_cmd2 |= G762_REG_FAN_CMD2_FAN_STARTV_0; |
| 568 | data->fan_cmd2 |= G762_REG_FAN_CMD2_FAN_STARTV_1; |
| 569 | break; |
| 570 | default: |
| 571 | ret = -EINVAL; |
| 572 | goto out; |
| 573 | } |
| 574 | ret = i2c_smbus_write_byte_data(client, G762_REG_FAN_CMD2, |
| 575 | data->fan_cmd2); |
| 576 | data->valid = false; |
| 577 | out: |
| 578 | mutex_unlock(&data->update_lock); |
| 579 | |
| 580 | return ret; |
| 581 | } |
| 582 | |
| 583 | /* |
| 584 | * Helper to import hardware characteristics from .dts file and push |
| 585 | * those to the chip. |
| 586 | */ |
| 587 | |
| 588 | #ifdef CONFIG_OF |
| 589 | static struct of_device_id g762_dt_match[] = { |
| 590 | { .compatible = "gmt,g762" }, |
| 591 | { .compatible = "gmt,g763" }, |
| 592 | { }, |
| 593 | }; |
| 594 | |
| 595 | /* |
| 596 | * Grab clock (a required property), enable it, get (fixed) clock frequency |
| 597 | * and store it. Note: upon success, clock has been prepared and enabled; it |
| 598 | * must later be unprepared and disabled (e.g. during module unloading) by a |
| 599 | * call to g762_of_clock_disable(). Note that a reference to clock is kept |
| 600 | * in our private data structure to be used in this function. |
| 601 | */ |
| 602 | static int g762_of_clock_enable(struct i2c_client *client) |
| 603 | { |
| 604 | struct g762_data *data; |
| 605 | unsigned long clk_freq; |
| 606 | struct clk *clk; |
| 607 | int ret; |
| 608 | |
| 609 | if (!client->dev.of_node) |
| 610 | return 0; |
| 611 | |
| 612 | clk = of_clk_get(client->dev.of_node, 0); |
| 613 | if (IS_ERR(clk)) { |
| 614 | dev_err(&client->dev, "failed to get clock\n"); |
| 615 | return PTR_ERR(clk); |
| 616 | } |
| 617 | |
| 618 | ret = clk_prepare_enable(clk); |
| 619 | if (ret) { |
| 620 | dev_err(&client->dev, "failed to enable clock\n"); |
| 621 | goto clk_put; |
| 622 | } |
| 623 | |
| 624 | clk_freq = clk_get_rate(clk); |
| 625 | ret = do_set_clk_freq(&client->dev, clk_freq); |
| 626 | if (ret) { |
| 627 | dev_err(&client->dev, "invalid clock freq %lu\n", clk_freq); |
| 628 | goto clk_unprep; |
| 629 | } |
| 630 | |
| 631 | data = i2c_get_clientdata(client); |
| 632 | data->clk = clk; |
| 633 | |
| 634 | return 0; |
| 635 | |
| 636 | clk_unprep: |
| 637 | clk_disable_unprepare(clk); |
| 638 | |
| 639 | clk_put: |
| 640 | clk_put(clk); |
| 641 | |
| 642 | return ret; |
| 643 | } |
| 644 | |
| 645 | static void g762_of_clock_disable(struct i2c_client *client) |
| 646 | { |
| 647 | struct g762_data *data = i2c_get_clientdata(client); |
| 648 | |
| 649 | if (!data->clk) |
| 650 | return; |
| 651 | |
| 652 | clk_disable_unprepare(data->clk); |
| 653 | clk_put(data->clk); |
| 654 | } |
| 655 | |
| 656 | static int g762_of_prop_import_one(struct i2c_client *client, |
| 657 | const char *pname, |
| 658 | int (*psetter)(struct device *dev, |
| 659 | unsigned long val)) |
| 660 | { |
| 661 | const __be32 *prop; |
| 662 | int len, ret; |
| 663 | u32 pval; |
| 664 | |
| 665 | prop = of_get_property(client->dev.of_node, pname, &len); |
| 666 | if (!prop || len != sizeof(u32)) |
| 667 | return 0; |
| 668 | |
| 669 | pval = be32_to_cpu(prop[0]); |
| 670 | dev_dbg(&client->dev, "found %s (%d)\n", pname, pval); |
| 671 | ret = (*psetter)(&client->dev, pval); |
| 672 | if (ret) |
| 673 | dev_err(&client->dev, "unable to set %s (%d)\n", pname, pval); |
| 674 | |
| 675 | return ret; |
| 676 | } |
| 677 | |
| 678 | static int g762_of_prop_import(struct i2c_client *client) |
| 679 | { |
| 680 | int ret; |
| 681 | |
| 682 | if (!client->dev.of_node) |
| 683 | return 0; |
| 684 | |
| 685 | ret = g762_of_prop_import_one(client, "fan_gear_mode", |
| 686 | do_set_fan_gear_mode); |
| 687 | if (ret) |
| 688 | return ret; |
| 689 | |
| 690 | ret = g762_of_prop_import_one(client, "pwm_polarity", |
| 691 | do_set_pwm_polarity); |
| 692 | if (ret) |
| 693 | return ret; |
| 694 | |
| 695 | return g762_of_prop_import_one(client, "fan_startv", |
| 696 | do_set_fan_startv); |
| 697 | } |
| 698 | |
| 699 | #else |
| 700 | static int g762_of_prop_import(struct i2c_client *client) |
| 701 | { |
| 702 | return 0; |
| 703 | } |
| 704 | |
| 705 | static int g762_of_clock_enable(struct i2c_client *client) |
| 706 | { |
| 707 | return 0; |
| 708 | } |
| 709 | |
| 710 | static void g762_of_clock_disable(struct i2c_client *client) { } |
| 711 | #endif |
| 712 | |
| 713 | /* |
| 714 | * Helper to import hardware characteristics from .dts file and push |
| 715 | * those to the chip. |
| 716 | */ |
| 717 | |
| 718 | static int g762_pdata_prop_import(struct i2c_client *client) |
| 719 | { |
| 720 | struct g762_platform_data *pdata = client->dev.platform_data; |
| 721 | int ret; |
| 722 | |
| 723 | if (!pdata) |
| 724 | return 0; |
| 725 | |
| 726 | ret = do_set_fan_gear_mode(&client->dev, pdata->fan_gear_mode); |
| 727 | if (ret) |
| 728 | return ret; |
| 729 | |
| 730 | ret = do_set_pwm_polarity(&client->dev, pdata->pwm_polarity); |
| 731 | if (ret) |
| 732 | return ret; |
| 733 | |
| 734 | ret = do_set_fan_startv(&client->dev, pdata->fan_startv); |
| 735 | if (ret) |
| 736 | return ret; |
| 737 | |
| 738 | return do_set_clk_freq(&client->dev, pdata->clk_freq); |
| 739 | } |
| 740 | |
| 741 | /* |
| 742 | * sysfs attributes |
| 743 | */ |
| 744 | |
| 745 | /* |
| 746 | * Read function for fan1_input sysfs file. Return current fan RPM value, or |
| 747 | * 0 if fan is out of control. |
| 748 | */ |
| 749 | static ssize_t get_fan_rpm(struct device *dev, struct device_attribute *da, |
| 750 | char *buf) |
| 751 | { |
| 752 | struct g762_data *data = g762_update_client(dev); |
| 753 | unsigned int rpm = 0; |
| 754 | |
| 755 | if (IS_ERR(data)) |
| 756 | return PTR_ERR(data); |
| 757 | |
| 758 | mutex_lock(&data->update_lock); |
| 759 | /* reverse logic: fan out of control reporting is enabled low */ |
| 760 | if (data->fan_sta & G762_REG_FAN_STA_OOC) { |
| 761 | rpm = rpm_from_cnt(data->act_cnt, data->clk_freq, |
| 762 | G762_PULSE_FROM_REG(data->fan_cmd1), |
| 763 | G762_CLKDIV_FROM_REG(data->fan_cmd1), |
| 764 | G762_GEARMULT_FROM_REG(data->fan_cmd2)); |
| 765 | } |
| 766 | mutex_unlock(&data->update_lock); |
| 767 | |
| 768 | return sprintf(buf, "%u\n", rpm); |
| 769 | } |
| 770 | |
| 771 | /* |
| 772 | * Read and write functions for pwm1_mode sysfs file. Get and set fan speed |
| 773 | * control mode i.e. PWM (1) or DC (0). |
| 774 | */ |
| 775 | static ssize_t get_pwm_mode(struct device *dev, struct device_attribute *da, |
| 776 | char *buf) |
| 777 | { |
| 778 | struct g762_data *data = g762_update_client(dev); |
| 779 | |
| 780 | if (IS_ERR(data)) |
| 781 | return PTR_ERR(data); |
| 782 | |
| 783 | return sprintf(buf, "%d\n", |
| 784 | !!(data->fan_cmd1 & G762_REG_FAN_CMD1_OUT_MODE)); |
| 785 | } |
| 786 | |
| 787 | static ssize_t set_pwm_mode(struct device *dev, struct device_attribute *da, |
| 788 | const char *buf, size_t count) |
| 789 | { |
| 790 | unsigned long val; |
| 791 | int ret; |
| 792 | |
| 793 | if (kstrtoul(buf, 10, &val)) |
| 794 | return -EINVAL; |
| 795 | |
| 796 | ret = do_set_pwm_mode(dev, val); |
| 797 | if (ret < 0) |
| 798 | return ret; |
| 799 | |
| 800 | return count; |
| 801 | } |
| 802 | |
| 803 | /* |
| 804 | * Read and write functions for fan1_div sysfs file. Get and set fan |
| 805 | * controller prescaler value |
| 806 | */ |
| 807 | static ssize_t get_fan_div(struct device *dev, |
| 808 | struct device_attribute *da, char *buf) |
| 809 | { |
| 810 | struct g762_data *data = g762_update_client(dev); |
| 811 | |
| 812 | if (IS_ERR(data)) |
| 813 | return PTR_ERR(data); |
| 814 | |
| 815 | return sprintf(buf, "%d\n", G762_CLKDIV_FROM_REG(data->fan_cmd1)); |
| 816 | } |
| 817 | |
| 818 | static ssize_t set_fan_div(struct device *dev, |
| 819 | struct device_attribute *da, |
| 820 | const char *buf, size_t count) |
| 821 | { |
| 822 | unsigned long val; |
| 823 | int ret; |
| 824 | |
| 825 | if (kstrtoul(buf, 10, &val)) |
| 826 | return -EINVAL; |
| 827 | |
| 828 | ret = do_set_fan_div(dev, val); |
| 829 | if (ret < 0) |
| 830 | return ret; |
| 831 | |
| 832 | return count; |
| 833 | } |
| 834 | |
| 835 | /* |
| 836 | * Read and write functions for fan1_pulses sysfs file. Get and set number |
| 837 | * of tachometer pulses per fan revolution. |
| 838 | */ |
| 839 | static ssize_t get_fan_pulses(struct device *dev, |
| 840 | struct device_attribute *da, char *buf) |
| 841 | { |
| 842 | struct g762_data *data = g762_update_client(dev); |
| 843 | |
| 844 | if (IS_ERR(data)) |
| 845 | return PTR_ERR(data); |
| 846 | |
| 847 | return sprintf(buf, "%d\n", G762_PULSE_FROM_REG(data->fan_cmd1)); |
| 848 | } |
| 849 | |
| 850 | static ssize_t set_fan_pulses(struct device *dev, |
| 851 | struct device_attribute *da, |
| 852 | const char *buf, size_t count) |
| 853 | { |
| 854 | unsigned long val; |
| 855 | int ret; |
| 856 | |
| 857 | if (kstrtoul(buf, 10, &val)) |
| 858 | return -EINVAL; |
| 859 | |
| 860 | ret = do_set_fan_pulses(dev, val); |
| 861 | if (ret < 0) |
| 862 | return ret; |
| 863 | |
| 864 | return count; |
| 865 | } |
| 866 | |
| 867 | /* |
| 868 | * Read and write functions for pwm1_enable. Get and set fan speed control mode |
| 869 | * (i.e. closed or open-loop). |
| 870 | * |
| 871 | * Following documentation about hwmon's sysfs interface, a pwm1_enable node |
| 872 | * should accept followings: |
| 873 | * |
| 874 | * 0 : no fan speed control (i.e. fan at full speed) |
| 875 | * 1 : manual fan speed control enabled (use pwm[1-*]) (open-loop) |
| 876 | * 2+: automatic fan speed control enabled (use fan[1-*]_target) (closed-loop) |
| 877 | * |
| 878 | * but we do not accept 0 as this mode is not natively supported by the chip |
| 879 | * and it is not emulated by g762 driver. -EINVAL is returned in this case. |
| 880 | */ |
| 881 | static ssize_t get_pwm_enable(struct device *dev, |
| 882 | struct device_attribute *da, char *buf) |
| 883 | { |
| 884 | struct g762_data *data = g762_update_client(dev); |
| 885 | |
| 886 | if (IS_ERR(data)) |
| 887 | return PTR_ERR(data); |
| 888 | |
| 889 | return sprintf(buf, "%d\n", |
| 890 | (!!(data->fan_cmd1 & G762_REG_FAN_CMD1_FAN_MODE)) + 1); |
| 891 | } |
| 892 | |
| 893 | static ssize_t set_pwm_enable(struct device *dev, |
| 894 | struct device_attribute *da, |
| 895 | const char *buf, size_t count) |
| 896 | { |
| 897 | unsigned long val; |
| 898 | int ret; |
| 899 | |
| 900 | if (kstrtoul(buf, 10, &val)) |
| 901 | return -EINVAL; |
| 902 | |
| 903 | ret = do_set_pwm_enable(dev, val); |
| 904 | if (ret < 0) |
| 905 | return ret; |
| 906 | |
| 907 | return count; |
| 908 | } |
| 909 | |
| 910 | /* |
| 911 | * Read and write functions for pwm1 sysfs file. Get and set pwm value |
| 912 | * (which affects fan speed) in open-loop mode. 0 stops the fan and 255 |
| 913 | * makes it run at full speed. |
| 914 | */ |
| 915 | static ssize_t get_pwm(struct device *dev, struct device_attribute *da, |
| 916 | char *buf) |
| 917 | { |
| 918 | struct g762_data *data = g762_update_client(dev); |
| 919 | |
| 920 | if (IS_ERR(data)) |
| 921 | return PTR_ERR(data); |
| 922 | |
| 923 | return sprintf(buf, "%d\n", data->set_out); |
| 924 | } |
| 925 | |
| 926 | static ssize_t set_pwm(struct device *dev, struct device_attribute *da, |
| 927 | const char *buf, size_t count) |
| 928 | { |
| 929 | unsigned long val; |
| 930 | int ret; |
| 931 | |
| 932 | if (kstrtoul(buf, 10, &val)) |
| 933 | return -EINVAL; |
| 934 | |
| 935 | ret = do_set_pwm(dev, val); |
| 936 | if (ret < 0) |
| 937 | return ret; |
| 938 | |
| 939 | return count; |
| 940 | } |
| 941 | |
| 942 | /* |
| 943 | * Read and write function for fan1_target sysfs file. Get/set the fan speed in |
| 944 | * closed-loop mode. Speed is given as a RPM value; then the chip will regulate |
| 945 | * the fan speed using pulses from fan tachometer. |
| 946 | * |
| 947 | * Refer to rpm_from_cnt() implementation above to get info about count number |
| 948 | * calculation. |
| 949 | * |
| 950 | * Also note that due to rounding errors it is possible that you don't read |
| 951 | * back exactly the value you have set. |
| 952 | */ |
| 953 | static ssize_t get_fan_target(struct device *dev, struct device_attribute *da, |
| 954 | char *buf) |
| 955 | { |
| 956 | struct g762_data *data = g762_update_client(dev); |
| 957 | unsigned int rpm; |
| 958 | |
| 959 | if (IS_ERR(data)) |
| 960 | return PTR_ERR(data); |
| 961 | |
| 962 | mutex_lock(&data->update_lock); |
| 963 | rpm = rpm_from_cnt(data->set_cnt, data->clk_freq, |
| 964 | G762_PULSE_FROM_REG(data->fan_cmd1), |
| 965 | G762_CLKDIV_FROM_REG(data->fan_cmd1), |
| 966 | G762_GEARMULT_FROM_REG(data->fan_cmd2)); |
| 967 | mutex_unlock(&data->update_lock); |
| 968 | |
| 969 | return sprintf(buf, "%u\n", rpm); |
| 970 | } |
| 971 | |
| 972 | static ssize_t set_fan_target(struct device *dev, struct device_attribute *da, |
| 973 | const char *buf, size_t count) |
| 974 | { |
| 975 | unsigned long val; |
| 976 | int ret; |
| 977 | |
| 978 | if (kstrtoul(buf, 10, &val)) |
| 979 | return -EINVAL; |
| 980 | |
| 981 | ret = do_set_fan_target(dev, val); |
| 982 | if (ret < 0) |
| 983 | return ret; |
| 984 | |
| 985 | return count; |
| 986 | } |
| 987 | |
| 988 | /* read function for fan1_fault sysfs file. */ |
| 989 | static ssize_t get_fan_failure(struct device *dev, struct device_attribute *da, |
| 990 | char *buf) |
| 991 | { |
| 992 | struct g762_data *data = g762_update_client(dev); |
| 993 | |
| 994 | if (IS_ERR(data)) |
| 995 | return PTR_ERR(data); |
| 996 | |
| 997 | return sprintf(buf, "%u\n", !!(data->fan_sta & G762_REG_FAN_STA_FAIL)); |
| 998 | } |
| 999 | |
| 1000 | /* |
| 1001 | * read function for fan1_alarm sysfs file. Note that OOC condition is |
| 1002 | * enabled low |
| 1003 | */ |
| 1004 | static ssize_t get_fan_ooc(struct device *dev, struct device_attribute *da, |
| 1005 | char *buf) |
| 1006 | { |
| 1007 | struct g762_data *data = g762_update_client(dev); |
| 1008 | |
| 1009 | if (IS_ERR(data)) |
| 1010 | return PTR_ERR(data); |
| 1011 | |
| 1012 | return sprintf(buf, "%u\n", !(data->fan_sta & G762_REG_FAN_STA_OOC)); |
| 1013 | } |
| 1014 | |
| 1015 | static DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, get_pwm, set_pwm); |
| 1016 | static DEVICE_ATTR(pwm1_mode, S_IWUSR | S_IRUGO, get_pwm_mode, set_pwm_mode); |
| 1017 | static DEVICE_ATTR(pwm1_enable, S_IWUSR | S_IRUGO, |
| 1018 | get_pwm_enable, set_pwm_enable); |
| 1019 | static DEVICE_ATTR(fan1_input, S_IRUGO, get_fan_rpm, NULL); |
| 1020 | static DEVICE_ATTR(fan1_alarm, S_IRUGO, get_fan_ooc, NULL); |
| 1021 | static DEVICE_ATTR(fan1_fault, S_IRUGO, get_fan_failure, NULL); |
| 1022 | static DEVICE_ATTR(fan1_target, S_IWUSR | S_IRUGO, |
| 1023 | get_fan_target, set_fan_target); |
| 1024 | static DEVICE_ATTR(fan1_div, S_IWUSR | S_IRUGO, get_fan_div, set_fan_div); |
| 1025 | static DEVICE_ATTR(fan1_pulses, S_IWUSR | S_IRUGO, |
| 1026 | get_fan_pulses, set_fan_pulses); |
| 1027 | |
| 1028 | /* Driver data */ |
| 1029 | static struct attribute *g762_attributes[] = { |
| 1030 | &dev_attr_fan1_input.attr, |
| 1031 | &dev_attr_fan1_alarm.attr, |
| 1032 | &dev_attr_fan1_fault.attr, |
| 1033 | &dev_attr_fan1_target.attr, |
| 1034 | &dev_attr_fan1_div.attr, |
| 1035 | &dev_attr_fan1_pulses.attr, |
| 1036 | &dev_attr_pwm1.attr, |
| 1037 | &dev_attr_pwm1_mode.attr, |
| 1038 | &dev_attr_pwm1_enable.attr, |
| 1039 | NULL |
| 1040 | }; |
| 1041 | |
| 1042 | static const struct attribute_group g762_group = { |
| 1043 | .attrs = g762_attributes, |
| 1044 | }; |
| 1045 | |
| 1046 | /* |
| 1047 | * Enable both fan failure detection and fan out of control protection. The |
| 1048 | * function does not protect change/access to data structure; it must thus |
| 1049 | * only be called during initialization. |
| 1050 | */ |
| 1051 | static inline int g762_fan_init(struct device *dev) |
| 1052 | { |
| 1053 | struct i2c_client *client = to_i2c_client(dev); |
| 1054 | struct g762_data *data = g762_update_client(dev); |
| 1055 | |
| 1056 | if (IS_ERR(data)) |
| 1057 | return PTR_ERR(data); |
| 1058 | |
| 1059 | data->fan_cmd1 |= G762_REG_FAN_CMD1_DET_FAN_FAIL; |
| 1060 | data->fan_cmd1 |= G762_REG_FAN_CMD1_DET_FAN_OOC; |
| 1061 | data->valid = false; |
| 1062 | |
| 1063 | return i2c_smbus_write_byte_data(client, G762_REG_FAN_CMD1, |
| 1064 | data->fan_cmd1); |
| 1065 | } |
| 1066 | |
| 1067 | static int g762_probe(struct i2c_client *client, const struct i2c_device_id *id) |
| 1068 | { |
| 1069 | struct g762_data *data; |
| 1070 | int ret; |
| 1071 | |
| 1072 | if (!i2c_check_functionality(client->adapter, |
| 1073 | I2C_FUNC_SMBUS_BYTE_DATA)) |
| 1074 | return -ENODEV; |
| 1075 | |
| 1076 | data = devm_kzalloc(&client->dev, sizeof(struct g762_data), GFP_KERNEL); |
| 1077 | if (!data) |
| 1078 | return -ENOMEM; |
| 1079 | |
| 1080 | i2c_set_clientdata(client, data); |
| 1081 | data->client = client; |
| 1082 | mutex_init(&data->update_lock); |
| 1083 | |
| 1084 | /* Enable fan failure detection and fan out of control protection */ |
| 1085 | ret = g762_fan_init(&client->dev); |
| 1086 | if (ret) |
| 1087 | return ret; |
| 1088 | |
| 1089 | /* Get configuration via DT ... */ |
| 1090 | ret = g762_of_clock_enable(client); |
| 1091 | if (ret) |
| 1092 | return ret; |
| 1093 | ret = g762_of_prop_import(client); |
| 1094 | if (ret) |
| 1095 | goto clock_dis; |
| 1096 | /* ... or platform_data */ |
| 1097 | ret = g762_pdata_prop_import(client); |
| 1098 | if (ret) |
| 1099 | goto clock_dis; |
| 1100 | |
| 1101 | /* Register sysfs hooks */ |
| 1102 | ret = sysfs_create_group(&client->dev.kobj, &g762_group); |
| 1103 | if (ret) |
| 1104 | goto clock_dis; |
| 1105 | |
| 1106 | data->hwmon_dev = hwmon_device_register(&client->dev); |
| 1107 | if (IS_ERR(data->hwmon_dev)) { |
| 1108 | ret = PTR_ERR(data->hwmon_dev); |
| 1109 | goto sysfs_rem; |
| 1110 | } |
| 1111 | |
| 1112 | return 0; |
| 1113 | |
| 1114 | sysfs_rem: |
| 1115 | sysfs_remove_group(&client->dev.kobj, &g762_group); |
| 1116 | |
| 1117 | clock_dis: |
| 1118 | g762_of_clock_disable(client); |
| 1119 | |
| 1120 | return ret; |
| 1121 | } |
| 1122 | |
| 1123 | static int g762_remove(struct i2c_client *client) |
| 1124 | { |
| 1125 | struct g762_data *data = i2c_get_clientdata(client); |
| 1126 | |
| 1127 | hwmon_device_unregister(data->hwmon_dev); |
| 1128 | sysfs_remove_group(&client->dev.kobj, &g762_group); |
| 1129 | g762_of_clock_disable(client); |
| 1130 | |
| 1131 | return 0; |
| 1132 | } |
| 1133 | |
| 1134 | static struct i2c_driver g762_driver = { |
| 1135 | .driver = { |
| 1136 | .name = DRVNAME, |
| 1137 | .owner = THIS_MODULE, |
| 1138 | .of_match_table = of_match_ptr(g762_dt_match), |
| 1139 | }, |
| 1140 | .probe = g762_probe, |
| 1141 | .remove = g762_remove, |
| 1142 | .id_table = g762_id, |
| 1143 | }; |
| 1144 | |
| 1145 | module_i2c_driver(g762_driver); |
| 1146 | |
| 1147 | MODULE_AUTHOR("Arnaud EBALARD <arno@natisbad.org>"); |
| 1148 | MODULE_DESCRIPTION("GMT G762/G763 driver"); |
| 1149 | MODULE_LICENSE("GPL"); |