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ae6b4d85 LW |
1 | /* |
2 | * Core driver for the pin config portions of the pin control subsystem | |
3 | * | |
4 | * Copyright (C) 2011 ST-Ericsson SA | |
5 | * Written on behalf of Linaro for ST-Ericsson | |
6 | * | |
7 | * Author: Linus Walleij <linus.walleij@linaro.org> | |
8 | * | |
9 | * License terms: GNU General Public License (GPL) version 2 | |
10 | */ | |
11 | #define pr_fmt(fmt) "pinconfig core: " fmt | |
12 | ||
13 | #include <linux/kernel.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/device.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/debugfs.h> | |
19 | #include <linux/seq_file.h> | |
20 | #include <linux/pinctrl/machine.h> | |
21 | #include <linux/pinctrl/pinctrl.h> | |
22 | #include <linux/pinctrl/pinconf.h> | |
23 | #include "core.h" | |
24 | #include "pinconf.h" | |
25 | ||
26 | int pin_config_get_for_pin(struct pinctrl_dev *pctldev, unsigned pin, | |
27 | unsigned long *config) | |
28 | { | |
29 | const struct pinconf_ops *ops = pctldev->desc->confops; | |
30 | ||
31 | if (!ops || !ops->pin_config_get) { | |
51cd24ee | 32 | dev_err(pctldev->dev, "cannot get pin configuration, missing " |
ae6b4d85 LW |
33 | "pin_config_get() function in driver\n"); |
34 | return -EINVAL; | |
35 | } | |
36 | ||
37 | return ops->pin_config_get(pctldev, pin, config); | |
38 | } | |
39 | ||
40 | /** | |
41 | * pin_config_get() - get the configuration of a single pin parameter | |
43699dea | 42 | * @dev_name: name of the pin controller device for this pin |
ae6b4d85 LW |
43 | * @name: name of the pin to get the config for |
44 | * @config: the config pointed to by this argument will be filled in with the | |
45 | * current pin state, it can be used directly by drivers as a numeral, or | |
46 | * it can be dereferenced to any struct. | |
47 | */ | |
43699dea | 48 | int pin_config_get(const char *dev_name, const char *name, |
ae6b4d85 LW |
49 | unsigned long *config) |
50 | { | |
43699dea | 51 | struct pinctrl_dev *pctldev; |
ae6b4d85 LW |
52 | int pin; |
53 | ||
43699dea SW |
54 | pctldev = get_pinctrl_dev_from_dev(NULL, dev_name); |
55 | if (!pctldev) | |
56 | return -EINVAL; | |
57 | ||
ae6b4d85 LW |
58 | pin = pin_get_from_name(pctldev, name); |
59 | if (pin < 0) | |
60 | return pin; | |
61 | ||
62 | return pin_config_get_for_pin(pctldev, pin, config); | |
63 | } | |
64 | EXPORT_SYMBOL(pin_config_get); | |
65 | ||
66 | int pin_config_set_for_pin(struct pinctrl_dev *pctldev, unsigned pin, | |
67 | unsigned long config) | |
68 | { | |
69 | const struct pinconf_ops *ops = pctldev->desc->confops; | |
70 | int ret; | |
71 | ||
72 | if (!ops || !ops->pin_config_set) { | |
51cd24ee | 73 | dev_err(pctldev->dev, "cannot configure pin, missing " |
ae6b4d85 LW |
74 | "config function in driver\n"); |
75 | return -EINVAL; | |
76 | } | |
77 | ||
78 | ret = ops->pin_config_set(pctldev, pin, config); | |
79 | if (ret) { | |
51cd24ee | 80 | dev_err(pctldev->dev, |
ae6b4d85 LW |
81 | "unable to set pin configuration on pin %d\n", pin); |
82 | return ret; | |
83 | } | |
84 | ||
85 | return 0; | |
86 | } | |
87 | ||
88 | /** | |
89 | * pin_config_set() - set the configuration of a single pin parameter | |
43699dea | 90 | * @dev_name: name of pin controller device for this pin |
ae6b4d85 LW |
91 | * @name: name of the pin to set the config for |
92 | * @config: the config in this argument will contain the desired pin state, it | |
93 | * can be used directly by drivers as a numeral, or it can be dereferenced | |
94 | * to any struct. | |
95 | */ | |
43699dea | 96 | int pin_config_set(const char *dev_name, const char *name, |
ae6b4d85 LW |
97 | unsigned long config) |
98 | { | |
43699dea | 99 | struct pinctrl_dev *pctldev; |
ae6b4d85 LW |
100 | int pin; |
101 | ||
43699dea SW |
102 | pctldev = get_pinctrl_dev_from_dev(NULL, dev_name); |
103 | if (!pctldev) | |
104 | return -EINVAL; | |
105 | ||
ae6b4d85 LW |
106 | pin = pin_get_from_name(pctldev, name); |
107 | if (pin < 0) | |
108 | return pin; | |
109 | ||
110 | return pin_config_set_for_pin(pctldev, pin, config); | |
111 | } | |
112 | EXPORT_SYMBOL(pin_config_set); | |
113 | ||
43699dea | 114 | int pin_config_group_get(const char *dev_name, const char *pin_group, |
ae6b4d85 LW |
115 | unsigned long *config) |
116 | { | |
43699dea SW |
117 | struct pinctrl_dev *pctldev; |
118 | const struct pinconf_ops *ops; | |
ae6b4d85 LW |
119 | int selector; |
120 | ||
43699dea SW |
121 | pctldev = get_pinctrl_dev_from_dev(NULL, dev_name); |
122 | if (!pctldev) | |
123 | return -EINVAL; | |
124 | ops = pctldev->desc->confops; | |
125 | ||
ae6b4d85 | 126 | if (!ops || !ops->pin_config_group_get) { |
51cd24ee | 127 | dev_err(pctldev->dev, "cannot get configuration for pin " |
ae6b4d85 LW |
128 | "group, missing group config get function in " |
129 | "driver\n"); | |
130 | return -EINVAL; | |
131 | } | |
132 | ||
133 | selector = pinctrl_get_group_selector(pctldev, pin_group); | |
134 | if (selector < 0) | |
135 | return selector; | |
136 | ||
137 | return ops->pin_config_group_get(pctldev, selector, config); | |
138 | } | |
139 | EXPORT_SYMBOL(pin_config_group_get); | |
140 | ||
141 | ||
43699dea | 142 | int pin_config_group_set(const char *dev_name, const char *pin_group, |
ae6b4d85 LW |
143 | unsigned long config) |
144 | { | |
43699dea SW |
145 | struct pinctrl_dev *pctldev; |
146 | const struct pinconf_ops *ops; | |
147 | const struct pinctrl_ops *pctlops; | |
ae6b4d85 LW |
148 | int selector; |
149 | const unsigned *pins; | |
150 | unsigned num_pins; | |
151 | int ret; | |
152 | int i; | |
153 | ||
43699dea SW |
154 | pctldev = get_pinctrl_dev_from_dev(NULL, dev_name); |
155 | if (!pctldev) | |
156 | return -EINVAL; | |
157 | ops = pctldev->desc->confops; | |
158 | pctlops = pctldev->desc->pctlops; | |
159 | ||
ae6b4d85 | 160 | if (!ops || (!ops->pin_config_group_set && !ops->pin_config_set)) { |
51cd24ee | 161 | dev_err(pctldev->dev, "cannot configure pin group, missing " |
ae6b4d85 LW |
162 | "config function in driver\n"); |
163 | return -EINVAL; | |
164 | } | |
165 | ||
166 | selector = pinctrl_get_group_selector(pctldev, pin_group); | |
167 | if (selector < 0) | |
168 | return selector; | |
169 | ||
170 | ret = pctlops->get_group_pins(pctldev, selector, &pins, &num_pins); | |
171 | if (ret) { | |
51cd24ee | 172 | dev_err(pctldev->dev, "cannot configure pin group, error " |
ae6b4d85 LW |
173 | "getting pins\n"); |
174 | return ret; | |
175 | } | |
176 | ||
177 | /* | |
178 | * If the pin controller supports handling entire groups we use that | |
179 | * capability. | |
180 | */ | |
181 | if (ops->pin_config_group_set) { | |
182 | ret = ops->pin_config_group_set(pctldev, selector, config); | |
183 | /* | |
184 | * If the pin controller prefer that a certain group be handled | |
185 | * pin-by-pin as well, it returns -EAGAIN. | |
186 | */ | |
187 | if (ret != -EAGAIN) | |
188 | return ret; | |
189 | } | |
190 | ||
191 | /* | |
192 | * If the controller cannot handle entire groups, we configure each pin | |
193 | * individually. | |
194 | */ | |
195 | if (!ops->pin_config_set) | |
196 | return 0; | |
197 | ||
198 | for (i = 0; i < num_pins; i++) { | |
199 | ret = ops->pin_config_set(pctldev, pins[i], config); | |
200 | if (ret < 0) | |
201 | return ret; | |
202 | } | |
203 | ||
204 | return 0; | |
205 | } | |
206 | EXPORT_SYMBOL(pin_config_group_set); | |
207 | ||
b9130b77 | 208 | int pinconf_check_ops(struct pinctrl_dev *pctldev) |
ae6b4d85 | 209 | { |
b9130b77 TL |
210 | const struct pinconf_ops *ops = pctldev->desc->confops; |
211 | ||
ae6b4d85 LW |
212 | /* We must be able to read out pin status */ |
213 | if (!ops->pin_config_get && !ops->pin_config_group_get) | |
214 | return -EINVAL; | |
215 | /* We have to be able to config the pins in SOME way */ | |
216 | if (!ops->pin_config_set && !ops->pin_config_group_set) | |
217 | return -EINVAL; | |
218 | return 0; | |
219 | } | |
220 | ||
221 | #ifdef CONFIG_DEBUG_FS | |
222 | ||
223 | static void pinconf_dump_pin(struct pinctrl_dev *pctldev, | |
224 | struct seq_file *s, int pin) | |
225 | { | |
226 | const struct pinconf_ops *ops = pctldev->desc->confops; | |
227 | ||
228 | if (ops && ops->pin_config_dbg_show) | |
229 | ops->pin_config_dbg_show(pctldev, s, pin); | |
230 | } | |
231 | ||
232 | static int pinconf_pins_show(struct seq_file *s, void *what) | |
233 | { | |
234 | struct pinctrl_dev *pctldev = s->private; | |
706e8520 | 235 | unsigned i, pin; |
ae6b4d85 LW |
236 | |
237 | seq_puts(s, "Pin config settings per pin\n"); | |
238 | seq_puts(s, "Format: pin (name): pinmux setting array\n"); | |
239 | ||
706e8520 | 240 | /* The pin number can be retrived from the pin controller descriptor */ |
546edd83 | 241 | for (i = 0; i < pctldev->desc->npins; i++) { |
ae6b4d85 LW |
242 | struct pin_desc *desc; |
243 | ||
706e8520 | 244 | pin = pctldev->desc->pins[i].number; |
ae6b4d85 | 245 | desc = pin_desc_get(pctldev, pin); |
706e8520 | 246 | /* Skip if we cannot search the pin */ |
ae6b4d85 LW |
247 | if (desc == NULL) |
248 | continue; | |
249 | ||
250 | seq_printf(s, "pin %d (%s):", pin, | |
251 | desc->name ? desc->name : "unnamed"); | |
252 | ||
253 | pinconf_dump_pin(pctldev, s, pin); | |
254 | ||
255 | seq_printf(s, "\n"); | |
256 | } | |
257 | ||
258 | return 0; | |
259 | } | |
260 | ||
261 | static void pinconf_dump_group(struct pinctrl_dev *pctldev, | |
262 | struct seq_file *s, unsigned selector, | |
263 | const char *gname) | |
264 | { | |
265 | const struct pinconf_ops *ops = pctldev->desc->confops; | |
266 | ||
267 | if (ops && ops->pin_config_group_dbg_show) | |
268 | ops->pin_config_group_dbg_show(pctldev, s, selector); | |
269 | } | |
270 | ||
271 | static int pinconf_groups_show(struct seq_file *s, void *what) | |
272 | { | |
273 | struct pinctrl_dev *pctldev = s->private; | |
274 | const struct pinctrl_ops *pctlops = pctldev->desc->pctlops; | |
275 | const struct pinconf_ops *ops = pctldev->desc->confops; | |
276 | unsigned selector = 0; | |
277 | ||
278 | if (!ops || !ops->pin_config_group_get) | |
279 | return 0; | |
280 | ||
281 | seq_puts(s, "Pin config settings per pin group\n"); | |
282 | seq_puts(s, "Format: group (name): pinmux setting array\n"); | |
283 | ||
284 | while (pctlops->list_groups(pctldev, selector) >= 0) { | |
285 | const char *gname = pctlops->get_group_name(pctldev, selector); | |
286 | ||
287 | seq_printf(s, "%u (%s):", selector, gname); | |
288 | pinconf_dump_group(pctldev, s, selector, gname); | |
289 | selector++; | |
290 | } | |
291 | ||
292 | return 0; | |
293 | } | |
294 | ||
295 | static int pinconf_pins_open(struct inode *inode, struct file *file) | |
296 | { | |
297 | return single_open(file, pinconf_pins_show, inode->i_private); | |
298 | } | |
299 | ||
300 | static int pinconf_groups_open(struct inode *inode, struct file *file) | |
301 | { | |
302 | return single_open(file, pinconf_groups_show, inode->i_private); | |
303 | } | |
304 | ||
305 | static const struct file_operations pinconf_pins_ops = { | |
306 | .open = pinconf_pins_open, | |
307 | .read = seq_read, | |
308 | .llseek = seq_lseek, | |
309 | .release = single_release, | |
310 | }; | |
311 | ||
312 | static const struct file_operations pinconf_groups_ops = { | |
313 | .open = pinconf_groups_open, | |
314 | .read = seq_read, | |
315 | .llseek = seq_lseek, | |
316 | .release = single_release, | |
317 | }; | |
318 | ||
319 | void pinconf_init_device_debugfs(struct dentry *devroot, | |
320 | struct pinctrl_dev *pctldev) | |
321 | { | |
322 | debugfs_create_file("pinconf-pins", S_IFREG | S_IRUGO, | |
323 | devroot, pctldev, &pinconf_pins_ops); | |
324 | debugfs_create_file("pinconf-groups", S_IFREG | S_IRUGO, | |
325 | devroot, pctldev, &pinconf_groups_ops); | |
326 | } | |
327 | ||
328 | #endif |