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Message-ID: <20210317051239.GW2087@kadam>
Date: Wed, 17 Mar 2021 08:12:40 +0300
From: Dan Carpenter <dan.carpenter@...cle.com>
To: kbuild@...ts.01.org,
Václav Kubernát <kubernat@...net.cz>
Cc: lkp@...el.com, kbuild-all@...ts.01.org,
Václav Kubernát <kubernat@...net.cz>,
Jean Delvare <jdelvare@...e.com>,
Guenter Roeck <linux@...ck-us.net>,
Jonathan Corbet <corbet@....net>, linux-hwmon@...r.kernel.org,
linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/5] hwmon: (max31790) Rework to use regmap
Hi "Václav,
url: https://github.com/0day-ci/linux/commits/V-clav-Kubern-t/hwmon-max31790-Rework-to-use-regmap/20210317-015931
base: https://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging.git hwmon-next
config: x86_64-randconfig-m001-20210316 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
smatch warnings:
drivers/hwmon/max31790.c:263 max31790_fan_is_visible() warn: impossible condition '(fan_config < 0) => (0-255 < 0)'
drivers/hwmon/max31790.c:337 max31790_write_pwm() warn: impossible condition '(fan_config < 0) => (0-255 < 0)'
drivers/hwmon/max31790.c:372 max31790_pwm_is_visible() warn: impossible condition '(fan_config < 0) => (0-255 < 0)'
vim +263 drivers/hwmon/max31790.c
54187ff9d766b2 Guenter Roeck 2016-07-01 257 static umode_t max31790_fan_is_visible(const void *_data, u32 attr, int channel)
195a4b4298a795 Il Han 2015-08-30 258 {
54187ff9d766b2 Guenter Roeck 2016-07-01 259 const struct max31790_data *data = _data;
2c8602cfaeab63 Václav Kubernát 2021-03-16 260 struct regmap *regmap = data->regmap;
2c8602cfaeab63 Václav Kubernát 2021-03-16 261 u8 fan_config = read_reg_byte(regmap, MAX31790_REG_FAN_CONFIG(channel % NR_CHANNEL));
2c8602cfaeab63 Václav Kubernát 2021-03-16 262
2c8602cfaeab63 Václav Kubernát 2021-03-16 @263 if (fan_config < 0)
^^^^^^^^^^^^^^
A u8 can't be negative.
2c8602cfaeab63 Václav Kubernát 2021-03-16 264 return 0;
54187ff9d766b2 Guenter Roeck 2016-07-01 265
54187ff9d766b2 Guenter Roeck 2016-07-01 266 switch (attr) {
54187ff9d766b2 Guenter Roeck 2016-07-01 267 case hwmon_fan_input:
54187ff9d766b2 Guenter Roeck 2016-07-01 268 case hwmon_fan_fault:
54187ff9d766b2 Guenter Roeck 2016-07-01 269 if (channel < NR_CHANNEL ||
54187ff9d766b2 Guenter Roeck 2016-07-01 270 (fan_config & MAX31790_FAN_CFG_TACH_INPUT))
dc8dbb4d7672b7 Guenter Roeck 2018-12-10 271 return 0444;
54187ff9d766b2 Guenter Roeck 2016-07-01 272 return 0;
54187ff9d766b2 Guenter Roeck 2016-07-01 273 case hwmon_fan_target:
54187ff9d766b2 Guenter Roeck 2016-07-01 274 if (channel < NR_CHANNEL &&
54187ff9d766b2 Guenter Roeck 2016-07-01 275 !(fan_config & MAX31790_FAN_CFG_TACH_INPUT))
dc8dbb4d7672b7 Guenter Roeck 2018-12-10 276 return 0644;
54187ff9d766b2 Guenter Roeck 2016-07-01 277 return 0;
54187ff9d766b2 Guenter Roeck 2016-07-01 278 default:
54187ff9d766b2 Guenter Roeck 2016-07-01 279 return 0;
195a4b4298a795 Il Han 2015-08-30 280 }
195a4b4298a795 Il Han 2015-08-30 281 }
195a4b4298a795 Il Han 2015-08-30 282
54187ff9d766b2 Guenter Roeck 2016-07-01 283 static int max31790_read_pwm(struct device *dev, u32 attr, int channel,
54187ff9d766b2 Guenter Roeck 2016-07-01 284 long *val)
195a4b4298a795 Il Han 2015-08-30 285 {
2c8602cfaeab63 Václav Kubernát 2021-03-16 286 struct max31790_data *data = dev_get_drvdata(dev);
2c8602cfaeab63 Václav Kubernát 2021-03-16 287 struct regmap *regmap = data->regmap;
2c8602cfaeab63 Václav Kubernát 2021-03-16 288 int read;
195a4b4298a795 Il Han 2015-08-30 289
195a4b4298a795 Il Han 2015-08-30 290 if (IS_ERR(data))
195a4b4298a795 Il Han 2015-08-30 291 return PTR_ERR(data);
195a4b4298a795 Il Han 2015-08-30 292
54187ff9d766b2 Guenter Roeck 2016-07-01 293 switch (attr) {
54187ff9d766b2 Guenter Roeck 2016-07-01 294 case hwmon_pwm_input:
2c8602cfaeab63 Václav Kubernát 2021-03-16 295 read = read_reg_word(regmap, MAX31790_REG_PWMOUT(channel));
2c8602cfaeab63 Václav Kubernát 2021-03-16 296 if (read < 0)
2c8602cfaeab63 Václav Kubernát 2021-03-16 297 return read;
2c8602cfaeab63 Václav Kubernát 2021-03-16 298
2c8602cfaeab63 Václav Kubernát 2021-03-16 299 *val = read >> 8;
54187ff9d766b2 Guenter Roeck 2016-07-01 300 return 0;
54187ff9d766b2 Guenter Roeck 2016-07-01 301 case hwmon_pwm_enable:
2c8602cfaeab63 Václav Kubernát 2021-03-16 302 read = read_reg_byte(regmap, MAX31790_REG_FAN_CONFIG(channel));
2c8602cfaeab63 Václav Kubernát 2021-03-16 303 if (read < 0)
2c8602cfaeab63 Václav Kubernát 2021-03-16 304 return read;
2c8602cfaeab63 Václav Kubernát 2021-03-16 305
2c8602cfaeab63 Václav Kubernát 2021-03-16 306 if (read & MAX31790_FAN_CFG_RPM_MODE)
54187ff9d766b2 Guenter Roeck 2016-07-01 307 *val = 2;
2c8602cfaeab63 Václav Kubernát 2021-03-16 308 else if (read & MAX31790_FAN_CFG_TACH_INPUT_EN)
54187ff9d766b2 Guenter Roeck 2016-07-01 309 *val = 1;
195a4b4298a795 Il Han 2015-08-30 310 else
54187ff9d766b2 Guenter Roeck 2016-07-01 311 *val = 0;
54187ff9d766b2 Guenter Roeck 2016-07-01 312 return 0;
54187ff9d766b2 Guenter Roeck 2016-07-01 313 default:
54187ff9d766b2 Guenter Roeck 2016-07-01 314 return -EOPNOTSUPP;
54187ff9d766b2 Guenter Roeck 2016-07-01 315 }
195a4b4298a795 Il Han 2015-08-30 316 }
195a4b4298a795 Il Han 2015-08-30 317
54187ff9d766b2 Guenter Roeck 2016-07-01 318 static int max31790_write_pwm(struct device *dev, u32 attr, int channel,
54187ff9d766b2 Guenter Roeck 2016-07-01 319 long val)
195a4b4298a795 Il Han 2015-08-30 320 {
195a4b4298a795 Il Han 2015-08-30 321 struct max31790_data *data = dev_get_drvdata(dev);
2c8602cfaeab63 Václav Kubernát 2021-03-16 322 struct regmap *regmap = data->regmap;
54187ff9d766b2 Guenter Roeck 2016-07-01 323 u8 fan_config;
54187ff9d766b2 Guenter Roeck 2016-07-01 324 int err = 0;
195a4b4298a795 Il Han 2015-08-30 325
54187ff9d766b2 Guenter Roeck 2016-07-01 326 switch (attr) {
54187ff9d766b2 Guenter Roeck 2016-07-01 327 case hwmon_pwm_input:
54187ff9d766b2 Guenter Roeck 2016-07-01 328 if (val < 0 || val > 255) {
54187ff9d766b2 Guenter Roeck 2016-07-01 329 err = -EINVAL;
54187ff9d766b2 Guenter Roeck 2016-07-01 330 break;
54187ff9d766b2 Guenter Roeck 2016-07-01 331 }
2c8602cfaeab63 Václav Kubernát 2021-03-16 332 err = write_reg_word(regmap, MAX31790_REG_PWMOUT(channel), val << 8);
195a4b4298a795 Il Han 2015-08-30 333 break;
54187ff9d766b2 Guenter Roeck 2016-07-01 334 case hwmon_pwm_enable:
2c8602cfaeab63 Václav Kubernát 2021-03-16 335 fan_config = read_reg_byte(regmap, MAX31790_REG_FAN_CONFIG(channel % NR_CHANNEL));
2c8602cfaeab63 Václav Kubernát 2021-03-16 336
2c8602cfaeab63 Václav Kubernát 2021-03-16 @337 if (fan_config < 0)
2c8602cfaeab63 Václav Kubernát 2021-03-16 338 return fan_config;
2c8602cfaeab63 Václav Kubernát 2021-03-16 339
54187ff9d766b2 Guenter Roeck 2016-07-01 340 if (val == 0) {
54187ff9d766b2 Guenter Roeck 2016-07-01 341 fan_config &= ~(MAX31790_FAN_CFG_TACH_INPUT_EN |
54187ff9d766b2 Guenter Roeck 2016-07-01 342 MAX31790_FAN_CFG_RPM_MODE);
54187ff9d766b2 Guenter Roeck 2016-07-01 343 } else if (val == 1) {
54187ff9d766b2 Guenter Roeck 2016-07-01 344 fan_config = (fan_config |
54187ff9d766b2 Guenter Roeck 2016-07-01 345 MAX31790_FAN_CFG_TACH_INPUT_EN) &
54187ff9d766b2 Guenter Roeck 2016-07-01 346 ~MAX31790_FAN_CFG_RPM_MODE;
54187ff9d766b2 Guenter Roeck 2016-07-01 347 } else if (val == 2) {
54187ff9d766b2 Guenter Roeck 2016-07-01 348 fan_config |= MAX31790_FAN_CFG_TACH_INPUT_EN |
54187ff9d766b2 Guenter Roeck 2016-07-01 349 MAX31790_FAN_CFG_RPM_MODE;
54187ff9d766b2 Guenter Roeck 2016-07-01 350 } else {
54187ff9d766b2 Guenter Roeck 2016-07-01 351 err = -EINVAL;
195a4b4298a795 Il Han 2015-08-30 352 break;
54187ff9d766b2 Guenter Roeck 2016-07-01 353 }
2c8602cfaeab63 Václav Kubernát 2021-03-16 354 err = regmap_write(regmap,
54187ff9d766b2 Guenter Roeck 2016-07-01 355 MAX31790_REG_FAN_CONFIG(channel),
54187ff9d766b2 Guenter Roeck 2016-07-01 356 fan_config);
195a4b4298a795 Il Han 2015-08-30 357 break;
195a4b4298a795 Il Han 2015-08-30 358 default:
54187ff9d766b2 Guenter Roeck 2016-07-01 359 err = -EOPNOTSUPP;
54187ff9d766b2 Guenter Roeck 2016-07-01 360 break;
195a4b4298a795 Il Han 2015-08-30 361 }
195a4b4298a795 Il Han 2015-08-30 362
195a4b4298a795 Il Han 2015-08-30 363 return err;
195a4b4298a795 Il Han 2015-08-30 364 }
195a4b4298a795 Il Han 2015-08-30 365
54187ff9d766b2 Guenter Roeck 2016-07-01 366 static umode_t max31790_pwm_is_visible(const void *_data, u32 attr, int channel)
195a4b4298a795 Il Han 2015-08-30 367 {
54187ff9d766b2 Guenter Roeck 2016-07-01 368 const struct max31790_data *data = _data;
2c8602cfaeab63 Václav Kubernát 2021-03-16 369 struct regmap *regmap = data->regmap;
2c8602cfaeab63 Václav Kubernát 2021-03-16 370 u8 fan_config = read_reg_byte(regmap, MAX31790_REG_FAN_CONFIG(channel % NR_CHANNEL));
2c8602cfaeab63 Václav Kubernát 2021-03-16 371
2c8602cfaeab63 Václav Kubernát 2021-03-16 @372 if (fan_config < 0)
2c8602cfaeab63 Václav Kubernát 2021-03-16 373 return 0;
54187ff9d766b2 Guenter Roeck 2016-07-01 374
54187ff9d766b2 Guenter Roeck 2016-07-01 375 switch (attr) {
54187ff9d766b2 Guenter Roeck 2016-07-01 376 case hwmon_pwm_input:
54187ff9d766b2 Guenter Roeck 2016-07-01 377 case hwmon_pwm_enable:
54187ff9d766b2 Guenter Roeck 2016-07-01 378 if (!(fan_config & MAX31790_FAN_CFG_TACH_INPUT))
dc8dbb4d7672b7 Guenter Roeck 2018-12-10 379 return 0644;
54187ff9d766b2 Guenter Roeck 2016-07-01 380 return 0;
54187ff9d766b2 Guenter Roeck 2016-07-01 381 default:
54187ff9d766b2 Guenter Roeck 2016-07-01 382 return 0;
54187ff9d766b2 Guenter Roeck 2016-07-01 383 }
54187ff9d766b2 Guenter Roeck 2016-07-01 384 }
---
0-DAY CI Kernel Test Service, Intel Corporation
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