Simon Guinot | d6fe136 | 2010-10-22 00:44:19 +0200 | [diff] [blame] | 1 | /* |
| 2 | * gpio-fan.c - Hwmon driver for fans connected to GPIO lines. |
| 3 | * |
| 4 | * Copyright (C) 2010 LaCie |
| 5 | * |
| 6 | * Author: Simon Guinot <sguinot@lacie.com> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; either version 2 of the License, or |
| 11 | * (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program; if not, write to the Free Software |
| 20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 21 | */ |
| 22 | |
| 23 | #include <linux/module.h> |
| 24 | #include <linux/init.h> |
| 25 | #include <linux/slab.h> |
| 26 | #include <linux/interrupt.h> |
| 27 | #include <linux/irq.h> |
| 28 | #include <linux/platform_device.h> |
| 29 | #include <linux/err.h> |
| 30 | #include <linux/mutex.h> |
| 31 | #include <linux/hwmon.h> |
| 32 | #include <linux/gpio.h> |
| 33 | #include <linux/gpio-fan.h> |
Jamie Lentin | 55fb8b06 | 2012-09-14 17:07:06 +0100 | [diff] [blame] | 34 | #include <linux/of_platform.h> |
| 35 | #include <linux/of_gpio.h> |
Simon Guinot | d6fe136 | 2010-10-22 00:44:19 +0200 | [diff] [blame] | 36 | |
| 37 | struct gpio_fan_data { |
| 38 | struct platform_device *pdev; |
| 39 | struct device *hwmon_dev; |
| 40 | struct mutex lock; /* lock GPIOs operations. */ |
| 41 | int num_ctrl; |
| 42 | unsigned *ctrl; |
| 43 | int num_speed; |
| 44 | struct gpio_fan_speed *speed; |
| 45 | int speed_index; |
Rafael J. Wysocki | 6d20a6c | 2012-07-08 00:01:03 +0200 | [diff] [blame] | 46 | #ifdef CONFIG_PM_SLEEP |
Simon Guinot | d6fe136 | 2010-10-22 00:44:19 +0200 | [diff] [blame] | 47 | int resume_speed; |
| 48 | #endif |
| 49 | bool pwm_enable; |
| 50 | struct gpio_fan_alarm *alarm; |
| 51 | struct work_struct alarm_work; |
| 52 | }; |
| 53 | |
| 54 | /* |
| 55 | * Alarm GPIO. |
| 56 | */ |
| 57 | |
| 58 | static void fan_alarm_notify(struct work_struct *ws) |
| 59 | { |
| 60 | struct gpio_fan_data *fan_data = |
| 61 | container_of(ws, struct gpio_fan_data, alarm_work); |
| 62 | |
| 63 | sysfs_notify(&fan_data->pdev->dev.kobj, NULL, "fan1_alarm"); |
| 64 | kobject_uevent(&fan_data->pdev->dev.kobj, KOBJ_CHANGE); |
| 65 | } |
| 66 | |
| 67 | static irqreturn_t fan_alarm_irq_handler(int irq, void *dev_id) |
| 68 | { |
| 69 | struct gpio_fan_data *fan_data = dev_id; |
| 70 | |
| 71 | schedule_work(&fan_data->alarm_work); |
| 72 | |
| 73 | return IRQ_NONE; |
| 74 | } |
| 75 | |
| 76 | static ssize_t show_fan_alarm(struct device *dev, |
| 77 | struct device_attribute *attr, char *buf) |
| 78 | { |
| 79 | struct gpio_fan_data *fan_data = dev_get_drvdata(dev); |
| 80 | struct gpio_fan_alarm *alarm = fan_data->alarm; |
| 81 | int value = gpio_get_value(alarm->gpio); |
| 82 | |
| 83 | if (alarm->active_low) |
| 84 | value = !value; |
| 85 | |
| 86 | return sprintf(buf, "%d\n", value); |
| 87 | } |
| 88 | |
| 89 | static DEVICE_ATTR(fan1_alarm, S_IRUGO, show_fan_alarm, NULL); |
| 90 | |
| 91 | static int fan_alarm_init(struct gpio_fan_data *fan_data, |
| 92 | struct gpio_fan_alarm *alarm) |
| 93 | { |
| 94 | int err; |
| 95 | int alarm_irq; |
| 96 | struct platform_device *pdev = fan_data->pdev; |
| 97 | |
| 98 | fan_data->alarm = alarm; |
| 99 | |
Guenter Roeck | d00985f | 2012-06-02 09:58:07 -0700 | [diff] [blame] | 100 | err = devm_gpio_request(&pdev->dev, alarm->gpio, "GPIO fan alarm"); |
Simon Guinot | d6fe136 | 2010-10-22 00:44:19 +0200 | [diff] [blame] | 101 | if (err) |
| 102 | return err; |
| 103 | |
| 104 | err = gpio_direction_input(alarm->gpio); |
| 105 | if (err) |
Guenter Roeck | d00985f | 2012-06-02 09:58:07 -0700 | [diff] [blame] | 106 | return err; |
Simon Guinot | d6fe136 | 2010-10-22 00:44:19 +0200 | [diff] [blame] | 107 | |
Simon Guinot | d6fe136 | 2010-10-22 00:44:19 +0200 | [diff] [blame] | 108 | /* |
| 109 | * If the alarm GPIO don't support interrupts, just leave |
| 110 | * without initializing the fail notification support. |
| 111 | */ |
| 112 | alarm_irq = gpio_to_irq(alarm->gpio); |
| 113 | if (alarm_irq < 0) |
| 114 | return 0; |
| 115 | |
| 116 | INIT_WORK(&fan_data->alarm_work, fan_alarm_notify); |
Thomas Gleixner | dced35a | 2011-03-28 17:49:12 +0200 | [diff] [blame] | 117 | irq_set_irq_type(alarm_irq, IRQ_TYPE_EDGE_BOTH); |
Guenter Roeck | d00985f | 2012-06-02 09:58:07 -0700 | [diff] [blame] | 118 | err = devm_request_irq(&pdev->dev, alarm_irq, fan_alarm_irq_handler, |
| 119 | IRQF_SHARED, "GPIO fan alarm", fan_data); |
Simon Guinot | d6fe136 | 2010-10-22 00:44:19 +0200 | [diff] [blame] | 120 | return err; |
| 121 | } |
| 122 | |
Simon Guinot | d6fe136 | 2010-10-22 00:44:19 +0200 | [diff] [blame] | 123 | /* |
| 124 | * Control GPIOs. |
| 125 | */ |
| 126 | |
| 127 | /* Must be called with fan_data->lock held, except during initialization. */ |
| 128 | static void __set_fan_ctrl(struct gpio_fan_data *fan_data, int ctrl_val) |
| 129 | { |
| 130 | int i; |
| 131 | |
| 132 | for (i = 0; i < fan_data->num_ctrl; i++) |
| 133 | gpio_set_value(fan_data->ctrl[i], (ctrl_val >> i) & 1); |
| 134 | } |
| 135 | |
| 136 | static int __get_fan_ctrl(struct gpio_fan_data *fan_data) |
| 137 | { |
| 138 | int i; |
| 139 | int ctrl_val = 0; |
| 140 | |
| 141 | for (i = 0; i < fan_data->num_ctrl; i++) { |
| 142 | int value; |
| 143 | |
| 144 | value = gpio_get_value(fan_data->ctrl[i]); |
| 145 | ctrl_val |= (value << i); |
| 146 | } |
| 147 | return ctrl_val; |
| 148 | } |
| 149 | |
| 150 | /* Must be called with fan_data->lock held, except during initialization. */ |
| 151 | static void set_fan_speed(struct gpio_fan_data *fan_data, int speed_index) |
| 152 | { |
| 153 | if (fan_data->speed_index == speed_index) |
| 154 | return; |
| 155 | |
| 156 | __set_fan_ctrl(fan_data, fan_data->speed[speed_index].ctrl_val); |
| 157 | fan_data->speed_index = speed_index; |
| 158 | } |
| 159 | |
| 160 | static int get_fan_speed_index(struct gpio_fan_data *fan_data) |
| 161 | { |
| 162 | int ctrl_val = __get_fan_ctrl(fan_data); |
| 163 | int i; |
| 164 | |
| 165 | for (i = 0; i < fan_data->num_speed; i++) |
| 166 | if (fan_data->speed[i].ctrl_val == ctrl_val) |
| 167 | return i; |
| 168 | |
| 169 | dev_warn(&fan_data->pdev->dev, |
| 170 | "missing speed array entry for GPIO value 0x%x\n", ctrl_val); |
| 171 | |
| 172 | return -EINVAL; |
| 173 | } |
| 174 | |
| 175 | static int rpm_to_speed_index(struct gpio_fan_data *fan_data, int rpm) |
| 176 | { |
| 177 | struct gpio_fan_speed *speed = fan_data->speed; |
| 178 | int i; |
| 179 | |
| 180 | for (i = 0; i < fan_data->num_speed; i++) |
| 181 | if (speed[i].rpm >= rpm) |
| 182 | return i; |
| 183 | |
| 184 | return fan_data->num_speed - 1; |
| 185 | } |
| 186 | |
| 187 | static ssize_t show_pwm(struct device *dev, |
| 188 | struct device_attribute *attr, char *buf) |
| 189 | { |
| 190 | struct gpio_fan_data *fan_data = dev_get_drvdata(dev); |
| 191 | u8 pwm = fan_data->speed_index * 255 / (fan_data->num_speed - 1); |
| 192 | |
| 193 | return sprintf(buf, "%d\n", pwm); |
| 194 | } |
| 195 | |
| 196 | static ssize_t set_pwm(struct device *dev, struct device_attribute *attr, |
| 197 | const char *buf, size_t count) |
| 198 | { |
| 199 | struct gpio_fan_data *fan_data = dev_get_drvdata(dev); |
| 200 | unsigned long pwm; |
| 201 | int speed_index; |
| 202 | int ret = count; |
| 203 | |
Frans Meulenbroeks | 179c4fd | 2012-01-04 20:58:52 +0100 | [diff] [blame] | 204 | if (kstrtoul(buf, 10, &pwm) || pwm > 255) |
Simon Guinot | d6fe136 | 2010-10-22 00:44:19 +0200 | [diff] [blame] | 205 | return -EINVAL; |
| 206 | |
| 207 | mutex_lock(&fan_data->lock); |
| 208 | |
| 209 | if (!fan_data->pwm_enable) { |
| 210 | ret = -EPERM; |
| 211 | goto exit_unlock; |
| 212 | } |
| 213 | |
| 214 | speed_index = DIV_ROUND_UP(pwm * (fan_data->num_speed - 1), 255); |
| 215 | set_fan_speed(fan_data, speed_index); |
| 216 | |
| 217 | exit_unlock: |
| 218 | mutex_unlock(&fan_data->lock); |
| 219 | |
| 220 | return ret; |
| 221 | } |
| 222 | |
| 223 | static ssize_t show_pwm_enable(struct device *dev, |
| 224 | struct device_attribute *attr, char *buf) |
| 225 | { |
| 226 | struct gpio_fan_data *fan_data = dev_get_drvdata(dev); |
| 227 | |
| 228 | return sprintf(buf, "%d\n", fan_data->pwm_enable); |
| 229 | } |
| 230 | |
| 231 | static ssize_t set_pwm_enable(struct device *dev, struct device_attribute *attr, |
| 232 | const char *buf, size_t count) |
| 233 | { |
| 234 | struct gpio_fan_data *fan_data = dev_get_drvdata(dev); |
| 235 | unsigned long val; |
| 236 | |
Frans Meulenbroeks | 179c4fd | 2012-01-04 20:58:52 +0100 | [diff] [blame] | 237 | if (kstrtoul(buf, 10, &val) || val > 1) |
Simon Guinot | d6fe136 | 2010-10-22 00:44:19 +0200 | [diff] [blame] | 238 | return -EINVAL; |
| 239 | |
| 240 | if (fan_data->pwm_enable == val) |
| 241 | return count; |
| 242 | |
| 243 | mutex_lock(&fan_data->lock); |
| 244 | |
| 245 | fan_data->pwm_enable = val; |
| 246 | |
| 247 | /* Disable manual control mode: set fan at full speed. */ |
| 248 | if (val == 0) |
| 249 | set_fan_speed(fan_data, fan_data->num_speed - 1); |
| 250 | |
| 251 | mutex_unlock(&fan_data->lock); |
| 252 | |
| 253 | return count; |
| 254 | } |
| 255 | |
| 256 | static ssize_t show_pwm_mode(struct device *dev, |
| 257 | struct device_attribute *attr, char *buf) |
| 258 | { |
| 259 | return sprintf(buf, "0\n"); |
| 260 | } |
| 261 | |
| 262 | static ssize_t show_rpm_min(struct device *dev, |
| 263 | struct device_attribute *attr, char *buf) |
| 264 | { |
| 265 | struct gpio_fan_data *fan_data = dev_get_drvdata(dev); |
| 266 | |
| 267 | return sprintf(buf, "%d\n", fan_data->speed[0].rpm); |
| 268 | } |
| 269 | |
| 270 | static ssize_t show_rpm_max(struct device *dev, |
| 271 | struct device_attribute *attr, char *buf) |
| 272 | { |
| 273 | struct gpio_fan_data *fan_data = dev_get_drvdata(dev); |
| 274 | |
| 275 | return sprintf(buf, "%d\n", |
| 276 | fan_data->speed[fan_data->num_speed - 1].rpm); |
| 277 | } |
| 278 | |
| 279 | static ssize_t show_rpm(struct device *dev, |
| 280 | struct device_attribute *attr, char *buf) |
| 281 | { |
| 282 | struct gpio_fan_data *fan_data = dev_get_drvdata(dev); |
| 283 | |
| 284 | return sprintf(buf, "%d\n", fan_data->speed[fan_data->speed_index].rpm); |
| 285 | } |
| 286 | |
| 287 | static ssize_t set_rpm(struct device *dev, struct device_attribute *attr, |
| 288 | const char *buf, size_t count) |
| 289 | { |
| 290 | struct gpio_fan_data *fan_data = dev_get_drvdata(dev); |
| 291 | unsigned long rpm; |
| 292 | int ret = count; |
| 293 | |
Frans Meulenbroeks | 179c4fd | 2012-01-04 20:58:52 +0100 | [diff] [blame] | 294 | if (kstrtoul(buf, 10, &rpm)) |
Simon Guinot | d6fe136 | 2010-10-22 00:44:19 +0200 | [diff] [blame] | 295 | return -EINVAL; |
| 296 | |
| 297 | mutex_lock(&fan_data->lock); |
| 298 | |
| 299 | if (!fan_data->pwm_enable) { |
| 300 | ret = -EPERM; |
| 301 | goto exit_unlock; |
| 302 | } |
| 303 | |
| 304 | set_fan_speed(fan_data, rpm_to_speed_index(fan_data, rpm)); |
| 305 | |
| 306 | exit_unlock: |
| 307 | mutex_unlock(&fan_data->lock); |
| 308 | |
| 309 | return ret; |
| 310 | } |
| 311 | |
Guenter Roeck | c81cc5a | 2013-03-30 09:09:39 -0700 | [diff] [blame] | 312 | static ssize_t show_name(struct device *dev, |
| 313 | struct device_attribute *attr, char *buf) |
| 314 | { |
| 315 | return sprintf(buf, "gpio-fan\n"); |
| 316 | } |
| 317 | |
Simon Guinot | d6fe136 | 2010-10-22 00:44:19 +0200 | [diff] [blame] | 318 | static DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, show_pwm, set_pwm); |
| 319 | static DEVICE_ATTR(pwm1_enable, S_IRUGO | S_IWUSR, |
| 320 | show_pwm_enable, set_pwm_enable); |
| 321 | static DEVICE_ATTR(pwm1_mode, S_IRUGO, show_pwm_mode, NULL); |
| 322 | static DEVICE_ATTR(fan1_min, S_IRUGO, show_rpm_min, NULL); |
| 323 | static DEVICE_ATTR(fan1_max, S_IRUGO, show_rpm_max, NULL); |
| 324 | static DEVICE_ATTR(fan1_input, S_IRUGO, show_rpm, NULL); |
| 325 | static DEVICE_ATTR(fan1_target, S_IRUGO | S_IWUSR, show_rpm, set_rpm); |
| 326 | |
Guenter Roeck | c81cc5a | 2013-03-30 09:09:39 -0700 | [diff] [blame] | 327 | static DEVICE_ATTR(name, S_IRUGO, show_name, NULL); |
| 328 | |
| 329 | static umode_t gpio_fan_is_visible(struct kobject *kobj, |
| 330 | struct attribute *attr, int index) |
| 331 | { |
| 332 | struct device *dev = container_of(kobj, struct device, kobj); |
| 333 | struct gpio_fan_data *data = dev_get_drvdata(dev); |
| 334 | |
| 335 | if (index == 1 && !data->alarm) |
| 336 | return 0; |
| 337 | if (index > 1 && !data->ctrl) |
| 338 | return 0; |
| 339 | |
| 340 | return attr->mode; |
| 341 | } |
| 342 | |
| 343 | static struct attribute *gpio_fan_attributes[] = { |
| 344 | &dev_attr_name.attr, |
| 345 | &dev_attr_fan1_alarm.attr, /* 1 */ |
| 346 | &dev_attr_pwm1.attr, /* 2 */ |
Simon Guinot | d6fe136 | 2010-10-22 00:44:19 +0200 | [diff] [blame] | 347 | &dev_attr_pwm1_enable.attr, |
| 348 | &dev_attr_pwm1_mode.attr, |
| 349 | &dev_attr_fan1_input.attr, |
| 350 | &dev_attr_fan1_target.attr, |
| 351 | &dev_attr_fan1_min.attr, |
| 352 | &dev_attr_fan1_max.attr, |
| 353 | NULL |
| 354 | }; |
| 355 | |
Guenter Roeck | c81cc5a | 2013-03-30 09:09:39 -0700 | [diff] [blame] | 356 | static const struct attribute_group gpio_fan_group = { |
| 357 | .attrs = gpio_fan_attributes, |
| 358 | .is_visible = gpio_fan_is_visible, |
Simon Guinot | d6fe136 | 2010-10-22 00:44:19 +0200 | [diff] [blame] | 359 | }; |
| 360 | |
| 361 | static int fan_ctrl_init(struct gpio_fan_data *fan_data, |
| 362 | struct gpio_fan_platform_data *pdata) |
| 363 | { |
| 364 | struct platform_device *pdev = fan_data->pdev; |
| 365 | int num_ctrl = pdata->num_ctrl; |
| 366 | unsigned *ctrl = pdata->ctrl; |
| 367 | int i, err; |
| 368 | |
| 369 | for (i = 0; i < num_ctrl; i++) { |
Guenter Roeck | d00985f | 2012-06-02 09:58:07 -0700 | [diff] [blame] | 370 | err = devm_gpio_request(&pdev->dev, ctrl[i], |
| 371 | "GPIO fan control"); |
Simon Guinot | d6fe136 | 2010-10-22 00:44:19 +0200 | [diff] [blame] | 372 | if (err) |
Guenter Roeck | d00985f | 2012-06-02 09:58:07 -0700 | [diff] [blame] | 373 | return err; |
Simon Guinot | d6fe136 | 2010-10-22 00:44:19 +0200 | [diff] [blame] | 374 | |
| 375 | err = gpio_direction_output(ctrl[i], gpio_get_value(ctrl[i])); |
Guenter Roeck | d00985f | 2012-06-02 09:58:07 -0700 | [diff] [blame] | 376 | if (err) |
| 377 | return err; |
Simon Guinot | d6fe136 | 2010-10-22 00:44:19 +0200 | [diff] [blame] | 378 | } |
| 379 | |
Simon Guinot | d6fe136 | 2010-10-22 00:44:19 +0200 | [diff] [blame] | 380 | fan_data->num_ctrl = num_ctrl; |
| 381 | fan_data->ctrl = ctrl; |
| 382 | fan_data->num_speed = pdata->num_speed; |
| 383 | fan_data->speed = pdata->speed; |
| 384 | fan_data->pwm_enable = true; /* Enable manual fan speed control. */ |
| 385 | fan_data->speed_index = get_fan_speed_index(fan_data); |
Guenter Roeck | d00985f | 2012-06-02 09:58:07 -0700 | [diff] [blame] | 386 | if (fan_data->speed_index < 0) |
| 387 | return -ENODEV; |
Simon Guinot | d6fe136 | 2010-10-22 00:44:19 +0200 | [diff] [blame] | 388 | |
Guenter Roeck | c81cc5a | 2013-03-30 09:09:39 -0700 | [diff] [blame] | 389 | return 0; |
Simon Guinot | d6fe136 | 2010-10-22 00:44:19 +0200 | [diff] [blame] | 390 | } |
| 391 | |
Jamie Lentin | 55fb8b06 | 2012-09-14 17:07:06 +0100 | [diff] [blame] | 392 | #ifdef CONFIG_OF_GPIO |
| 393 | /* |
| 394 | * Translate OpenFirmware node properties into platform_data |
| 395 | */ |
| 396 | static int gpio_fan_get_of_pdata(struct device *dev, |
| 397 | struct gpio_fan_platform_data *pdata) |
| 398 | { |
| 399 | struct device_node *node; |
| 400 | struct gpio_fan_speed *speed; |
| 401 | unsigned *ctrl; |
| 402 | unsigned i; |
| 403 | u32 u; |
| 404 | struct property *prop; |
| 405 | const __be32 *p; |
| 406 | |
| 407 | node = dev->of_node; |
| 408 | |
| 409 | /* Fill GPIO pin array */ |
| 410 | pdata->num_ctrl = of_gpio_count(node); |
Grant Likely | e80beb2 | 2013-02-12 17:48:37 +0000 | [diff] [blame] | 411 | if (pdata->num_ctrl <= 0) { |
Jamie Lentin | 55fb8b06 | 2012-09-14 17:07:06 +0100 | [diff] [blame] | 412 | dev_err(dev, "gpios DT property empty / missing"); |
| 413 | return -ENODEV; |
| 414 | } |
| 415 | ctrl = devm_kzalloc(dev, pdata->num_ctrl * sizeof(unsigned), |
| 416 | GFP_KERNEL); |
| 417 | if (!ctrl) |
| 418 | return -ENOMEM; |
| 419 | for (i = 0; i < pdata->num_ctrl; i++) { |
| 420 | int val; |
| 421 | |
| 422 | val = of_get_gpio(node, i); |
| 423 | if (val < 0) |
| 424 | return val; |
| 425 | ctrl[i] = val; |
| 426 | } |
| 427 | pdata->ctrl = ctrl; |
| 428 | |
| 429 | /* Get number of RPM/ctrl_val pairs in speed map */ |
| 430 | prop = of_find_property(node, "gpio-fan,speed-map", &i); |
| 431 | if (!prop) { |
| 432 | dev_err(dev, "gpio-fan,speed-map DT property missing"); |
| 433 | return -ENODEV; |
| 434 | } |
| 435 | i = i / sizeof(u32); |
| 436 | if (i == 0 || i & 1) { |
| 437 | dev_err(dev, "gpio-fan,speed-map contains zero/odd number of entries"); |
| 438 | return -ENODEV; |
| 439 | } |
| 440 | pdata->num_speed = i / 2; |
| 441 | |
| 442 | /* |
| 443 | * Populate speed map |
| 444 | * Speed map is in the form <RPM ctrl_val RPM ctrl_val ...> |
| 445 | * this needs splitting into pairs to create gpio_fan_speed structs |
| 446 | */ |
| 447 | speed = devm_kzalloc(dev, |
| 448 | pdata->num_speed * sizeof(struct gpio_fan_speed), |
| 449 | GFP_KERNEL); |
| 450 | if (!speed) |
| 451 | return -ENOMEM; |
| 452 | p = NULL; |
| 453 | for (i = 0; i < pdata->num_speed; i++) { |
| 454 | p = of_prop_next_u32(prop, p, &u); |
| 455 | if (!p) |
| 456 | return -ENODEV; |
| 457 | speed[i].rpm = u; |
| 458 | p = of_prop_next_u32(prop, p, &u); |
| 459 | if (!p) |
| 460 | return -ENODEV; |
| 461 | speed[i].ctrl_val = u; |
| 462 | } |
| 463 | pdata->speed = speed; |
| 464 | |
| 465 | /* Alarm GPIO if one exists */ |
Grant Likely | e80beb2 | 2013-02-12 17:48:37 +0000 | [diff] [blame] | 466 | if (of_gpio_named_count(node, "alarm-gpios") > 0) { |
Jamie Lentin | 55fb8b06 | 2012-09-14 17:07:06 +0100 | [diff] [blame] | 467 | struct gpio_fan_alarm *alarm; |
| 468 | int val; |
| 469 | enum of_gpio_flags flags; |
| 470 | |
| 471 | alarm = devm_kzalloc(dev, sizeof(struct gpio_fan_alarm), |
| 472 | GFP_KERNEL); |
| 473 | if (!alarm) |
| 474 | return -ENOMEM; |
| 475 | |
| 476 | val = of_get_named_gpio_flags(node, "alarm-gpios", 0, &flags); |
| 477 | if (val < 0) |
| 478 | return val; |
| 479 | alarm->gpio = val; |
| 480 | alarm->active_low = flags & OF_GPIO_ACTIVE_LOW; |
| 481 | |
| 482 | pdata->alarm = alarm; |
| 483 | } |
| 484 | |
| 485 | return 0; |
| 486 | } |
| 487 | |
Bill Pemberton | a597724 | 2012-11-19 13:24:37 -0500 | [diff] [blame] | 488 | static struct of_device_id of_gpio_fan_match[] = { |
Jamie Lentin | 55fb8b06 | 2012-09-14 17:07:06 +0100 | [diff] [blame] | 489 | { .compatible = "gpio-fan", }, |
| 490 | {}, |
| 491 | }; |
| 492 | #endif /* CONFIG_OF_GPIO */ |
| 493 | |
Bill Pemberton | 6c931ae | 2012-11-19 13:22:35 -0500 | [diff] [blame] | 494 | static int gpio_fan_probe(struct platform_device *pdev) |
Simon Guinot | d6fe136 | 2010-10-22 00:44:19 +0200 | [diff] [blame] | 495 | { |
| 496 | int err; |
| 497 | struct gpio_fan_data *fan_data; |
Jingoo Han | a8b3a3a | 2013-07-30 17:13:06 +0900 | [diff] [blame] | 498 | struct gpio_fan_platform_data *pdata = dev_get_platdata(&pdev->dev); |
Simon Guinot | d6fe136 | 2010-10-22 00:44:19 +0200 | [diff] [blame] | 499 | |
Jamie Lentin | 55fb8b06 | 2012-09-14 17:07:06 +0100 | [diff] [blame] | 500 | #ifdef CONFIG_OF_GPIO |
| 501 | if (!pdata) { |
| 502 | pdata = devm_kzalloc(&pdev->dev, |
| 503 | sizeof(struct gpio_fan_platform_data), |
| 504 | GFP_KERNEL); |
| 505 | if (!pdata) |
| 506 | return -ENOMEM; |
| 507 | |
| 508 | err = gpio_fan_get_of_pdata(&pdev->dev, pdata); |
| 509 | if (err) |
| 510 | return err; |
| 511 | } |
| 512 | #else /* CONFIG_OF_GPIO */ |
Simon Guinot | d6fe136 | 2010-10-22 00:44:19 +0200 | [diff] [blame] | 513 | if (!pdata) |
| 514 | return -EINVAL; |
Jamie Lentin | 55fb8b06 | 2012-09-14 17:07:06 +0100 | [diff] [blame] | 515 | #endif /* CONFIG_OF_GPIO */ |
Simon Guinot | d6fe136 | 2010-10-22 00:44:19 +0200 | [diff] [blame] | 516 | |
Guenter Roeck | d00985f | 2012-06-02 09:58:07 -0700 | [diff] [blame] | 517 | fan_data = devm_kzalloc(&pdev->dev, sizeof(struct gpio_fan_data), |
| 518 | GFP_KERNEL); |
Simon Guinot | d6fe136 | 2010-10-22 00:44:19 +0200 | [diff] [blame] | 519 | if (!fan_data) |
| 520 | return -ENOMEM; |
| 521 | |
| 522 | fan_data->pdev = pdev; |
| 523 | platform_set_drvdata(pdev, fan_data); |
| 524 | mutex_init(&fan_data->lock); |
| 525 | |
| 526 | /* Configure alarm GPIO if available. */ |
| 527 | if (pdata->alarm) { |
| 528 | err = fan_alarm_init(fan_data, pdata->alarm); |
| 529 | if (err) |
Guenter Roeck | d00985f | 2012-06-02 09:58:07 -0700 | [diff] [blame] | 530 | return err; |
Simon Guinot | d6fe136 | 2010-10-22 00:44:19 +0200 | [diff] [blame] | 531 | } |
| 532 | |
| 533 | /* Configure control GPIOs if available. */ |
| 534 | if (pdata->ctrl && pdata->num_ctrl > 0) { |
Guenter Roeck | c81cc5a | 2013-03-30 09:09:39 -0700 | [diff] [blame] | 535 | if (!pdata->speed || pdata->num_speed <= 1) |
| 536 | return -EINVAL; |
Simon Guinot | d6fe136 | 2010-10-22 00:44:19 +0200 | [diff] [blame] | 537 | err = fan_ctrl_init(fan_data, pdata); |
| 538 | if (err) |
Guenter Roeck | c81cc5a | 2013-03-30 09:09:39 -0700 | [diff] [blame] | 539 | return err; |
Simon Guinot | d6fe136 | 2010-10-22 00:44:19 +0200 | [diff] [blame] | 540 | } |
| 541 | |
Guenter Roeck | c81cc5a | 2013-03-30 09:09:39 -0700 | [diff] [blame] | 542 | err = sysfs_create_group(&pdev->dev.kobj, &gpio_fan_group); |
Simon Guinot | d6fe136 | 2010-10-22 00:44:19 +0200 | [diff] [blame] | 543 | if (err) |
Guenter Roeck | c81cc5a | 2013-03-30 09:09:39 -0700 | [diff] [blame] | 544 | return err; |
Simon Guinot | d6fe136 | 2010-10-22 00:44:19 +0200 | [diff] [blame] | 545 | |
| 546 | /* Make this driver part of hwmon class. */ |
| 547 | fan_data->hwmon_dev = hwmon_device_register(&pdev->dev); |
| 548 | if (IS_ERR(fan_data->hwmon_dev)) { |
| 549 | err = PTR_ERR(fan_data->hwmon_dev); |
Guenter Roeck | c81cc5a | 2013-03-30 09:09:39 -0700 | [diff] [blame] | 550 | goto err_remove; |
Simon Guinot | d6fe136 | 2010-10-22 00:44:19 +0200 | [diff] [blame] | 551 | } |
| 552 | |
| 553 | dev_info(&pdev->dev, "GPIO fan initialized\n"); |
| 554 | |
| 555 | return 0; |
| 556 | |
Guenter Roeck | c81cc5a | 2013-03-30 09:09:39 -0700 | [diff] [blame] | 557 | err_remove: |
| 558 | sysfs_remove_group(&pdev->dev.kobj, &gpio_fan_group); |
Simon Guinot | d6fe136 | 2010-10-22 00:44:19 +0200 | [diff] [blame] | 559 | return err; |
| 560 | } |
| 561 | |
Bill Pemberton | 281dfd0 | 2012-11-19 13:25:51 -0500 | [diff] [blame] | 562 | static int gpio_fan_remove(struct platform_device *pdev) |
Simon Guinot | d6fe136 | 2010-10-22 00:44:19 +0200 | [diff] [blame] | 563 | { |
| 564 | struct gpio_fan_data *fan_data = platform_get_drvdata(pdev); |
| 565 | |
| 566 | hwmon_device_unregister(fan_data->hwmon_dev); |
Guenter Roeck | c81cc5a | 2013-03-30 09:09:39 -0700 | [diff] [blame] | 567 | sysfs_remove_group(&pdev->dev.kobj, &gpio_fan_group); |
Simon Guinot | d6fe136 | 2010-10-22 00:44:19 +0200 | [diff] [blame] | 568 | |
| 569 | return 0; |
| 570 | } |
| 571 | |
Rafael J. Wysocki | 6d20a6c | 2012-07-08 00:01:03 +0200 | [diff] [blame] | 572 | #ifdef CONFIG_PM_SLEEP |
| 573 | static int gpio_fan_suspend(struct device *dev) |
Simon Guinot | d6fe136 | 2010-10-22 00:44:19 +0200 | [diff] [blame] | 574 | { |
Rafael J. Wysocki | 6d20a6c | 2012-07-08 00:01:03 +0200 | [diff] [blame] | 575 | struct gpio_fan_data *fan_data = dev_get_drvdata(dev); |
Simon Guinot | d6fe136 | 2010-10-22 00:44:19 +0200 | [diff] [blame] | 576 | |
| 577 | if (fan_data->ctrl) { |
| 578 | fan_data->resume_speed = fan_data->speed_index; |
| 579 | set_fan_speed(fan_data, 0); |
| 580 | } |
| 581 | |
| 582 | return 0; |
| 583 | } |
| 584 | |
Rafael J. Wysocki | 6d20a6c | 2012-07-08 00:01:03 +0200 | [diff] [blame] | 585 | static int gpio_fan_resume(struct device *dev) |
Simon Guinot | d6fe136 | 2010-10-22 00:44:19 +0200 | [diff] [blame] | 586 | { |
Rafael J. Wysocki | 6d20a6c | 2012-07-08 00:01:03 +0200 | [diff] [blame] | 587 | struct gpio_fan_data *fan_data = dev_get_drvdata(dev); |
Simon Guinot | d6fe136 | 2010-10-22 00:44:19 +0200 | [diff] [blame] | 588 | |
| 589 | if (fan_data->ctrl) |
| 590 | set_fan_speed(fan_data, fan_data->resume_speed); |
| 591 | |
| 592 | return 0; |
| 593 | } |
Rafael J. Wysocki | 6d20a6c | 2012-07-08 00:01:03 +0200 | [diff] [blame] | 594 | |
| 595 | static SIMPLE_DEV_PM_OPS(gpio_fan_pm, gpio_fan_suspend, gpio_fan_resume); |
Guenter Roeck | 24f9c53 | 2013-01-10 05:54:40 -0800 | [diff] [blame] | 596 | #define GPIO_FAN_PM (&gpio_fan_pm) |
Simon Guinot | d6fe136 | 2010-10-22 00:44:19 +0200 | [diff] [blame] | 597 | #else |
Rafael J. Wysocki | 6d20a6c | 2012-07-08 00:01:03 +0200 | [diff] [blame] | 598 | #define GPIO_FAN_PM NULL |
Simon Guinot | d6fe136 | 2010-10-22 00:44:19 +0200 | [diff] [blame] | 599 | #endif |
| 600 | |
| 601 | static struct platform_driver gpio_fan_driver = { |
| 602 | .probe = gpio_fan_probe, |
Bill Pemberton | 9e5e9b7 | 2012-11-19 13:21:20 -0500 | [diff] [blame] | 603 | .remove = gpio_fan_remove, |
Simon Guinot | d6fe136 | 2010-10-22 00:44:19 +0200 | [diff] [blame] | 604 | .driver = { |
| 605 | .name = "gpio-fan", |
Rafael J. Wysocki | 6d20a6c | 2012-07-08 00:01:03 +0200 | [diff] [blame] | 606 | .pm = GPIO_FAN_PM, |
Jamie Lentin | eaa7cc6 | 2012-11-01 23:55:43 +0000 | [diff] [blame] | 607 | #ifdef CONFIG_OF_GPIO |
Jamie Lentin | 55fb8b06 | 2012-09-14 17:07:06 +0100 | [diff] [blame] | 608 | .of_match_table = of_match_ptr(of_gpio_fan_match), |
Jamie Lentin | eaa7cc6 | 2012-11-01 23:55:43 +0000 | [diff] [blame] | 609 | #endif |
Simon Guinot | d6fe136 | 2010-10-22 00:44:19 +0200 | [diff] [blame] | 610 | }, |
| 611 | }; |
| 612 | |
Axel Lin | 25a236a | 2011-11-25 02:31:00 -0500 | [diff] [blame] | 613 | module_platform_driver(gpio_fan_driver); |
Simon Guinot | d6fe136 | 2010-10-22 00:44:19 +0200 | [diff] [blame] | 614 | |
| 615 | MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>"); |
| 616 | MODULE_DESCRIPTION("GPIO FAN driver"); |
| 617 | MODULE_LICENSE("GPL"); |
| 618 | MODULE_ALIAS("platform:gpio-fan"); |