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0f98dd1b BJZ |
1 | /* |
2 | * GPIO Testing Device Driver | |
3 | * | |
4 | * Copyright (C) 2014 Kamlakant Patel <kamlakant.patel@broadcom.com> | |
5 | * Copyright (C) 2015-2016 Bamvor Jian Zhang <bamvor.zhangjian@linaro.org> | |
c60c7f4c | 6 | * Copyright (C) 2017 Bartosz Golaszewski <brgl@bgdev.pl> |
0f98dd1b BJZ |
7 | * |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU General Public License as published by the | |
10 | * Free Software Foundation; either version 2 of the License, or (at your | |
11 | * option) any later version. | |
12 | * | |
13 | */ | |
14 | ||
15 | #include <linux/init.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/gpio/driver.h> | |
9202ba23 | 18 | #include <linux/gpio/consumer.h> |
0f98dd1b | 19 | #include <linux/platform_device.h> |
8a68ea00 | 20 | #include <linux/slab.h> |
e2ff7408 BG |
21 | #include <linux/interrupt.h> |
22 | #include <linux/irq.h> | |
b4c495f0 | 23 | #include <linux/irq_sim.h> |
9202ba23 BG |
24 | #include <linux/debugfs.h> |
25 | #include <linux/uaccess.h> | |
26 | ||
27 | #include "gpiolib.h" | |
0f98dd1b | 28 | |
ca409160 BG |
29 | #define GPIO_MOCKUP_NAME "gpio-mockup" |
30 | #define GPIO_MOCKUP_MAX_GC 10 | |
b652336d BG |
31 | /* |
32 | * We're storing two values per chip: the GPIO base and the number | |
33 | * of GPIO lines. | |
34 | */ | |
35 | #define GPIO_MOCKUP_MAX_RANGES (GPIO_MOCKUP_MAX_GC * 2) | |
0f98dd1b | 36 | |
ca409160 | 37 | enum { |
8c6f96f4 BG |
38 | GPIO_MOCKUP_DIR_IN = 0, |
39 | GPIO_MOCKUP_DIR_OUT = 1, | |
0f98dd1b BJZ |
40 | }; |
41 | ||
42 | /* | |
43 | * struct gpio_pin_status - structure describing a GPIO status | |
44 | * @dir: Configures direction of gpio as "in" or "out", 0=in, 1=out | |
45 | * @value: Configures status of the gpio as 0(low) or 1(high) | |
46 | */ | |
ca409160 BG |
47 | struct gpio_mockup_line_status { |
48 | int dir; | |
0f98dd1b | 49 | bool value; |
e2ff7408 BG |
50 | }; |
51 | ||
ca409160 | 52 | struct gpio_mockup_chip { |
0f98dd1b | 53 | struct gpio_chip gc; |
ca409160 | 54 | struct gpio_mockup_line_status *lines; |
b4c495f0 | 55 | struct irq_sim irqsim; |
9202ba23 BG |
56 | struct dentry *dbg_dir; |
57 | }; | |
58 | ||
59 | struct gpio_mockup_dbgfs_private { | |
60 | struct gpio_mockup_chip *chip; | |
61 | struct gpio_desc *desc; | |
62 | int offset; | |
0f98dd1b BJZ |
63 | }; |
64 | ||
b652336d | 65 | static int gpio_mockup_ranges[GPIO_MOCKUP_MAX_RANGES]; |
0f98dd1b BJZ |
66 | static int gpio_mockup_params_nr; |
67 | module_param_array(gpio_mockup_ranges, int, &gpio_mockup_params_nr, 0400); | |
68 | ||
8a68ea00 BG |
69 | static bool gpio_mockup_named_lines; |
70 | module_param_named(gpio_mockup_named_lines, | |
71 | gpio_mockup_named_lines, bool, 0400); | |
72 | ||
ca409160 | 73 | static const char gpio_mockup_name_start = 'A'; |
9202ba23 | 74 | static struct dentry *gpio_mockup_dbg_dir; |
0f98dd1b | 75 | |
ca409160 | 76 | static int gpio_mockup_get(struct gpio_chip *gc, unsigned int offset) |
0f98dd1b | 77 | { |
ca409160 | 78 | struct gpio_mockup_chip *chip = gpiochip_get_data(gc); |
0f98dd1b | 79 | |
ca409160 | 80 | return chip->lines[offset].value; |
0f98dd1b BJZ |
81 | } |
82 | ||
ca409160 | 83 | static void gpio_mockup_set(struct gpio_chip *gc, unsigned int offset, |
0f98dd1b BJZ |
84 | int value) |
85 | { | |
ca409160 | 86 | struct gpio_mockup_chip *chip = gpiochip_get_data(gc); |
0f98dd1b | 87 | |
ca409160 | 88 | chip->lines[offset].value = !!value; |
0f98dd1b BJZ |
89 | } |
90 | ||
ca409160 | 91 | static int gpio_mockup_dirout(struct gpio_chip *gc, unsigned int offset, |
0f98dd1b BJZ |
92 | int value) |
93 | { | |
ca409160 BG |
94 | struct gpio_mockup_chip *chip = gpiochip_get_data(gc); |
95 | ||
96 | gpio_mockup_set(gc, offset, value); | |
c650c00c | 97 | chip->lines[offset].dir = GPIO_MOCKUP_DIR_OUT; |
0f98dd1b | 98 | |
0f98dd1b BJZ |
99 | return 0; |
100 | } | |
101 | ||
ca409160 | 102 | static int gpio_mockup_dirin(struct gpio_chip *gc, unsigned int offset) |
0f98dd1b | 103 | { |
ca409160 BG |
104 | struct gpio_mockup_chip *chip = gpiochip_get_data(gc); |
105 | ||
c650c00c | 106 | chip->lines[offset].dir = GPIO_MOCKUP_DIR_IN; |
0f98dd1b | 107 | |
0f98dd1b BJZ |
108 | return 0; |
109 | } | |
110 | ||
ca409160 | 111 | static int gpio_mockup_get_direction(struct gpio_chip *gc, unsigned int offset) |
0f98dd1b | 112 | { |
ca409160 | 113 | struct gpio_mockup_chip *chip = gpiochip_get_data(gc); |
0f98dd1b | 114 | |
8c6f96f4 | 115 | return !chip->lines[offset].dir; |
0f98dd1b BJZ |
116 | } |
117 | ||
8a68ea00 BG |
118 | static int gpio_mockup_name_lines(struct device *dev, |
119 | struct gpio_mockup_chip *chip) | |
120 | { | |
121 | struct gpio_chip *gc = &chip->gc; | |
122 | char **names; | |
123 | int i; | |
124 | ||
f6ac438e | 125 | names = devm_kcalloc(dev, gc->ngpio, sizeof(char *), GFP_KERNEL); |
8a68ea00 BG |
126 | if (!names) |
127 | return -ENOMEM; | |
128 | ||
129 | for (i = 0; i < gc->ngpio; i++) { | |
130 | names[i] = devm_kasprintf(dev, GFP_KERNEL, | |
131 | "%s-%d", gc->label, i); | |
132 | if (!names[i]) | |
133 | return -ENOMEM; | |
134 | } | |
135 | ||
136 | gc->names = (const char *const *)names; | |
137 | ||
138 | return 0; | |
139 | } | |
140 | ||
b4c495f0 | 141 | static int gpio_mockup_to_irq(struct gpio_chip *gc, unsigned int offset) |
c7f5326f | 142 | { |
c7f5326f BG |
143 | struct gpio_mockup_chip *chip = gpiochip_get_data(gc); |
144 | ||
b4c495f0 | 145 | return irq_sim_irqnum(&chip->irqsim, offset); |
e2ff7408 BG |
146 | } |
147 | ||
9202ba23 BG |
148 | static ssize_t gpio_mockup_event_write(struct file *file, |
149 | const char __user *usr_buf, | |
150 | size_t size, loff_t *ppos) | |
151 | { | |
152 | struct gpio_mockup_dbgfs_private *priv; | |
153 | struct gpio_mockup_chip *chip; | |
154 | struct seq_file *sfile; | |
155 | struct gpio_desc *desc; | |
6f9b3e77 | 156 | int rv, val; |
9202ba23 | 157 | |
6f9b3e77 BG |
158 | rv = kstrtoint_from_user(usr_buf, size, 0, &val); |
159 | if (rv) | |
160 | return rv; | |
161 | if (val != 0 && val != 1) | |
162 | return -EINVAL; | |
163 | ||
650b57b0 BG |
164 | sfile = file->private_data; |
165 | priv = sfile->private; | |
166 | desc = priv->desc; | |
167 | chip = priv->chip; | |
c7f5326f | 168 | |
b4c495f0 BG |
169 | gpiod_set_value_cansleep(desc, val); |
170 | irq_sim_fire(&chip->irqsim, priv->offset); | |
9202ba23 BG |
171 | |
172 | return size; | |
173 | } | |
174 | ||
175 | static int gpio_mockup_event_open(struct inode *inode, struct file *file) | |
176 | { | |
177 | return single_open(file, NULL, inode->i_private); | |
178 | } | |
179 | ||
180 | static const struct file_operations gpio_mockup_event_ops = { | |
181 | .owner = THIS_MODULE, | |
182 | .open = gpio_mockup_event_open, | |
183 | .write = gpio_mockup_event_write, | |
184 | .llseek = no_llseek, | |
185 | }; | |
186 | ||
187 | static void gpio_mockup_debugfs_setup(struct device *dev, | |
188 | struct gpio_mockup_chip *chip) | |
189 | { | |
190 | struct gpio_mockup_dbgfs_private *priv; | |
191 | struct dentry *evfile; | |
192 | struct gpio_chip *gc; | |
193 | char *name; | |
194 | int i; | |
195 | ||
196 | gc = &chip->gc; | |
197 | ||
198 | chip->dbg_dir = debugfs_create_dir(gc->label, gpio_mockup_dbg_dir); | |
199 | if (!chip->dbg_dir) | |
200 | goto err; | |
201 | ||
202 | for (i = 0; i < gc->ngpio; i++) { | |
203 | name = devm_kasprintf(dev, GFP_KERNEL, "%d", i); | |
204 | if (!name) | |
205 | goto err; | |
206 | ||
207 | priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); | |
208 | if (!priv) | |
209 | goto err; | |
210 | ||
211 | priv->chip = chip; | |
212 | priv->offset = i; | |
213 | priv->desc = &gc->gpiodev->descs[i]; | |
214 | ||
215 | evfile = debugfs_create_file(name, 0200, chip->dbg_dir, priv, | |
216 | &gpio_mockup_event_ops); | |
217 | if (!evfile) | |
218 | goto err; | |
219 | } | |
220 | ||
221 | return; | |
222 | ||
223 | err: | |
224 | dev_err(dev, "error creating debugfs directory\n"); | |
225 | } | |
226 | ||
ca409160 BG |
227 | static int gpio_mockup_add(struct device *dev, |
228 | struct gpio_mockup_chip *chip, | |
0f98dd1b BJZ |
229 | const char *name, int base, int ngpio) |
230 | { | |
ca409160 | 231 | struct gpio_chip *gc = &chip->gc; |
8a68ea00 | 232 | int ret; |
0f98dd1b | 233 | |
ca409160 BG |
234 | gc->base = base; |
235 | gc->ngpio = ngpio; | |
236 | gc->label = name; | |
237 | gc->owner = THIS_MODULE; | |
238 | gc->parent = dev; | |
239 | gc->get = gpio_mockup_get; | |
240 | gc->set = gpio_mockup_set; | |
241 | gc->direction_output = gpio_mockup_dirout; | |
242 | gc->direction_input = gpio_mockup_dirin; | |
243 | gc->get_direction = gpio_mockup_get_direction; | |
e2ff7408 | 244 | gc->to_irq = gpio_mockup_to_irq; |
ca409160 | 245 | |
f6ac438e BG |
246 | chip->lines = devm_kcalloc(dev, gc->ngpio, |
247 | sizeof(*chip->lines), GFP_KERNEL); | |
e4ba07bf BG |
248 | if (!chip->lines) |
249 | return -ENOMEM; | |
ca409160 | 250 | |
8a68ea00 BG |
251 | if (gpio_mockup_named_lines) { |
252 | ret = gpio_mockup_name_lines(dev, chip); | |
253 | if (ret) | |
254 | return ret; | |
255 | } | |
256 | ||
b4c495f0 | 257 | ret = devm_irq_sim_init(dev, &chip->irqsim, gc->ngpio); |
e2ff7408 BG |
258 | if (ret) |
259 | return ret; | |
260 | ||
9202ba23 BG |
261 | ret = devm_gpiochip_add_data(dev, &chip->gc, chip); |
262 | if (ret) | |
263 | return ret; | |
264 | ||
265 | if (gpio_mockup_dbg_dir) | |
266 | gpio_mockup_debugfs_setup(dev, chip); | |
267 | ||
268 | return 0; | |
0f98dd1b BJZ |
269 | } |
270 | ||
ca409160 | 271 | static int gpio_mockup_probe(struct platform_device *pdev) |
0f98dd1b | 272 | { |
b652336d | 273 | int ret, i, base, ngpio, num_chips; |
364ac456 | 274 | struct device *dev = &pdev->dev; |
b652336d | 275 | struct gpio_mockup_chip *chips; |
ad6d8004 | 276 | char *chip_name; |
0f98dd1b | 277 | |
b6c2e77d | 278 | if (gpio_mockup_params_nr < 2 || (gpio_mockup_params_nr % 2)) |
0f98dd1b BJZ |
279 | return -EINVAL; |
280 | ||
b652336d BG |
281 | /* Each chip is described by two values. */ |
282 | num_chips = gpio_mockup_params_nr / 2; | |
283 | ||
f6ac438e | 284 | chips = devm_kcalloc(dev, num_chips, sizeof(*chips), GFP_KERNEL); |
ca409160 | 285 | if (!chips) |
0f98dd1b BJZ |
286 | return -ENOMEM; |
287 | ||
ca409160 | 288 | platform_set_drvdata(pdev, chips); |
0f98dd1b | 289 | |
b652336d | 290 | for (i = 0; i < num_chips; i++) { |
0f98dd1b | 291 | base = gpio_mockup_ranges[i * 2]; |
ca409160 | 292 | |
0f98dd1b BJZ |
293 | if (base == -1) |
294 | ngpio = gpio_mockup_ranges[i * 2 + 1]; | |
295 | else | |
296 | ngpio = gpio_mockup_ranges[i * 2 + 1] - base; | |
297 | ||
298 | if (ngpio >= 0) { | |
ad6d8004 | 299 | chip_name = devm_kasprintf(dev, GFP_KERNEL, |
ca409160 BG |
300 | "%s-%c", GPIO_MOCKUP_NAME, |
301 | gpio_mockup_name_start + i); | |
ad6d8004 BG |
302 | if (!chip_name) |
303 | return -ENOMEM; | |
304 | ||
ca409160 | 305 | ret = gpio_mockup_add(dev, &chips[i], |
0f98dd1b BJZ |
306 | chip_name, base, ngpio); |
307 | } else { | |
4dc9d76c | 308 | ret = -EINVAL; |
0f98dd1b | 309 | } |
ca409160 | 310 | |
0f98dd1b | 311 | if (ret) { |
ec604f15 BG |
312 | dev_err(dev, |
313 | "adding gpiochip failed: %d (base: %d, ngpio: %d)\n", | |
314 | ret, base, base < 0 ? ngpio : base + ngpio); | |
0f98dd1b BJZ |
315 | |
316 | return ret; | |
317 | } | |
318 | } | |
319 | ||
320 | return 0; | |
321 | } | |
322 | ||
ca409160 | 323 | static struct platform_driver gpio_mockup_driver = { |
0f98dd1b | 324 | .driver = { |
ca409160 | 325 | .name = GPIO_MOCKUP_NAME, |
364ac456 | 326 | }, |
ca409160 | 327 | .probe = gpio_mockup_probe, |
0f98dd1b BJZ |
328 | }; |
329 | ||
330 | static struct platform_device *pdev; | |
331 | static int __init mock_device_init(void) | |
332 | { | |
333 | int err; | |
334 | ||
9202ba23 BG |
335 | gpio_mockup_dbg_dir = debugfs_create_dir("gpio-mockup-event", NULL); |
336 | if (!gpio_mockup_dbg_dir) | |
337 | pr_err("%s: error creating debugfs directory\n", | |
338 | GPIO_MOCKUP_NAME); | |
339 | ||
ca409160 | 340 | pdev = platform_device_alloc(GPIO_MOCKUP_NAME, -1); |
0f98dd1b BJZ |
341 | if (!pdev) |
342 | return -ENOMEM; | |
343 | ||
344 | err = platform_device_add(pdev); | |
345 | if (err) { | |
346 | platform_device_put(pdev); | |
347 | return err; | |
348 | } | |
349 | ||
ca409160 | 350 | err = platform_driver_register(&gpio_mockup_driver); |
0f98dd1b BJZ |
351 | if (err) { |
352 | platform_device_unregister(pdev); | |
353 | return err; | |
354 | } | |
355 | ||
356 | return 0; | |
357 | } | |
358 | ||
359 | static void __exit mock_device_exit(void) | |
360 | { | |
9202ba23 | 361 | debugfs_remove_recursive(gpio_mockup_dbg_dir); |
ca409160 | 362 | platform_driver_unregister(&gpio_mockup_driver); |
0f98dd1b BJZ |
363 | platform_device_unregister(pdev); |
364 | } | |
365 | ||
366 | module_init(mock_device_init); | |
367 | module_exit(mock_device_exit); | |
368 | ||
369 | MODULE_AUTHOR("Kamlakant Patel <kamlakant.patel@broadcom.com>"); | |
370 | MODULE_AUTHOR("Bamvor Jian Zhang <bamvor.zhangjian@linaro.org>"); | |
c60c7f4c | 371 | MODULE_AUTHOR("Bartosz Golaszewski <brgl@bgdev.pl>"); |
0f98dd1b BJZ |
372 | MODULE_DESCRIPTION("GPIO Testing driver"); |
373 | MODULE_LICENSE("GPL v2"); |