Commit | Line | Data |
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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) { | |
32 | dev_err(&pctldev->dev, "cannot get pin configuration, missing " | |
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 | |
42 | * @pctldev: pin controller device for this pin | |
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 | */ | |
48 | int pin_config_get(struct pinctrl_dev *pctldev, const char *name, | |
49 | unsigned long *config) | |
50 | { | |
51 | int pin; | |
52 | ||
53 | pin = pin_get_from_name(pctldev, name); | |
54 | if (pin < 0) | |
55 | return pin; | |
56 | ||
57 | return pin_config_get_for_pin(pctldev, pin, config); | |
58 | } | |
59 | EXPORT_SYMBOL(pin_config_get); | |
60 | ||
61 | int pin_config_set_for_pin(struct pinctrl_dev *pctldev, unsigned pin, | |
62 | unsigned long config) | |
63 | { | |
64 | const struct pinconf_ops *ops = pctldev->desc->confops; | |
65 | int ret; | |
66 | ||
67 | if (!ops || !ops->pin_config_set) { | |
68 | dev_err(&pctldev->dev, "cannot configure pin, missing " | |
69 | "config function in driver\n"); | |
70 | return -EINVAL; | |
71 | } | |
72 | ||
73 | ret = ops->pin_config_set(pctldev, pin, config); | |
74 | if (ret) { | |
75 | dev_err(&pctldev->dev, | |
76 | "unable to set pin configuration on pin %d\n", pin); | |
77 | return ret; | |
78 | } | |
79 | ||
80 | return 0; | |
81 | } | |
82 | ||
83 | /** | |
84 | * pin_config_set() - set the configuration of a single pin parameter | |
85 | * @pctldev: pin controller device for this pin | |
86 | * @name: name of the pin to set the config for | |
87 | * @config: the config in this argument will contain the desired pin state, it | |
88 | * can be used directly by drivers as a numeral, or it can be dereferenced | |
89 | * to any struct. | |
90 | */ | |
91 | int pin_config_set(struct pinctrl_dev *pctldev, const char *name, | |
92 | unsigned long config) | |
93 | { | |
94 | int pin; | |
95 | ||
96 | pin = pin_get_from_name(pctldev, name); | |
97 | if (pin < 0) | |
98 | return pin; | |
99 | ||
100 | return pin_config_set_for_pin(pctldev, pin, config); | |
101 | } | |
102 | EXPORT_SYMBOL(pin_config_set); | |
103 | ||
104 | int pin_config_group_get(struct pinctrl_dev *pctldev, const char *pin_group, | |
105 | unsigned long *config) | |
106 | { | |
107 | const struct pinconf_ops *ops = pctldev->desc->confops; | |
108 | int selector; | |
109 | ||
110 | if (!ops || !ops->pin_config_group_get) { | |
111 | dev_err(&pctldev->dev, "cannot get configuration for pin " | |
112 | "group, missing group config get function in " | |
113 | "driver\n"); | |
114 | return -EINVAL; | |
115 | } | |
116 | ||
117 | selector = pinctrl_get_group_selector(pctldev, pin_group); | |
118 | if (selector < 0) | |
119 | return selector; | |
120 | ||
121 | return ops->pin_config_group_get(pctldev, selector, config); | |
122 | } | |
123 | EXPORT_SYMBOL(pin_config_group_get); | |
124 | ||
125 | ||
126 | int pin_config_group_set(struct pinctrl_dev *pctldev, const char *pin_group, | |
127 | unsigned long config) | |
128 | { | |
129 | const struct pinctrl_ops *pctlops = pctldev->desc->pctlops; | |
130 | const struct pinconf_ops *ops = pctldev->desc->confops; | |
131 | int selector; | |
132 | const unsigned *pins; | |
133 | unsigned num_pins; | |
134 | int ret; | |
135 | int i; | |
136 | ||
137 | if (!ops || (!ops->pin_config_group_set && !ops->pin_config_set)) { | |
138 | dev_err(&pctldev->dev, "cannot configure pin group, missing " | |
139 | "config function in driver\n"); | |
140 | return -EINVAL; | |
141 | } | |
142 | ||
143 | selector = pinctrl_get_group_selector(pctldev, pin_group); | |
144 | if (selector < 0) | |
145 | return selector; | |
146 | ||
147 | ret = pctlops->get_group_pins(pctldev, selector, &pins, &num_pins); | |
148 | if (ret) { | |
149 | dev_err(&pctldev->dev, "cannot configure pin group, error " | |
150 | "getting pins\n"); | |
151 | return ret; | |
152 | } | |
153 | ||
154 | /* | |
155 | * If the pin controller supports handling entire groups we use that | |
156 | * capability. | |
157 | */ | |
158 | if (ops->pin_config_group_set) { | |
159 | ret = ops->pin_config_group_set(pctldev, selector, config); | |
160 | /* | |
161 | * If the pin controller prefer that a certain group be handled | |
162 | * pin-by-pin as well, it returns -EAGAIN. | |
163 | */ | |
164 | if (ret != -EAGAIN) | |
165 | return ret; | |
166 | } | |
167 | ||
168 | /* | |
169 | * If the controller cannot handle entire groups, we configure each pin | |
170 | * individually. | |
171 | */ | |
172 | if (!ops->pin_config_set) | |
173 | return 0; | |
174 | ||
175 | for (i = 0; i < num_pins; i++) { | |
176 | ret = ops->pin_config_set(pctldev, pins[i], config); | |
177 | if (ret < 0) | |
178 | return ret; | |
179 | } | |
180 | ||
181 | return 0; | |
182 | } | |
183 | EXPORT_SYMBOL(pin_config_group_set); | |
184 | ||
185 | int pinconf_check_ops(const struct pinconf_ops *ops) | |
186 | { | |
187 | /* We must be able to read out pin status */ | |
188 | if (!ops->pin_config_get && !ops->pin_config_group_get) | |
189 | return -EINVAL; | |
190 | /* We have to be able to config the pins in SOME way */ | |
191 | if (!ops->pin_config_set && !ops->pin_config_group_set) | |
192 | return -EINVAL; | |
193 | return 0; | |
194 | } | |
195 | ||
196 | #ifdef CONFIG_DEBUG_FS | |
197 | ||
198 | static void pinconf_dump_pin(struct pinctrl_dev *pctldev, | |
199 | struct seq_file *s, int pin) | |
200 | { | |
201 | const struct pinconf_ops *ops = pctldev->desc->confops; | |
202 | ||
203 | if (ops && ops->pin_config_dbg_show) | |
204 | ops->pin_config_dbg_show(pctldev, s, pin); | |
205 | } | |
206 | ||
207 | static int pinconf_pins_show(struct seq_file *s, void *what) | |
208 | { | |
209 | struct pinctrl_dev *pctldev = s->private; | |
210 | unsigned pin; | |
211 | ||
212 | seq_puts(s, "Pin config settings per pin\n"); | |
213 | seq_puts(s, "Format: pin (name): pinmux setting array\n"); | |
214 | ||
215 | /* The highest pin number need to be included in the loop, thus <= */ | |
216 | for (pin = 0; pin <= pctldev->desc->maxpin; pin++) { | |
217 | struct pin_desc *desc; | |
218 | ||
219 | desc = pin_desc_get(pctldev, pin); | |
220 | /* Pin space may be sparse */ | |
221 | if (desc == NULL) | |
222 | continue; | |
223 | ||
224 | seq_printf(s, "pin %d (%s):", pin, | |
225 | desc->name ? desc->name : "unnamed"); | |
226 | ||
227 | pinconf_dump_pin(pctldev, s, pin); | |
228 | ||
229 | seq_printf(s, "\n"); | |
230 | } | |
231 | ||
232 | return 0; | |
233 | } | |
234 | ||
235 | static void pinconf_dump_group(struct pinctrl_dev *pctldev, | |
236 | struct seq_file *s, unsigned selector, | |
237 | const char *gname) | |
238 | { | |
239 | const struct pinconf_ops *ops = pctldev->desc->confops; | |
240 | ||
241 | if (ops && ops->pin_config_group_dbg_show) | |
242 | ops->pin_config_group_dbg_show(pctldev, s, selector); | |
243 | } | |
244 | ||
245 | static int pinconf_groups_show(struct seq_file *s, void *what) | |
246 | { | |
247 | struct pinctrl_dev *pctldev = s->private; | |
248 | const struct pinctrl_ops *pctlops = pctldev->desc->pctlops; | |
249 | const struct pinconf_ops *ops = pctldev->desc->confops; | |
250 | unsigned selector = 0; | |
251 | ||
252 | if (!ops || !ops->pin_config_group_get) | |
253 | return 0; | |
254 | ||
255 | seq_puts(s, "Pin config settings per pin group\n"); | |
256 | seq_puts(s, "Format: group (name): pinmux setting array\n"); | |
257 | ||
258 | while (pctlops->list_groups(pctldev, selector) >= 0) { | |
259 | const char *gname = pctlops->get_group_name(pctldev, selector); | |
260 | ||
261 | seq_printf(s, "%u (%s):", selector, gname); | |
262 | pinconf_dump_group(pctldev, s, selector, gname); | |
263 | selector++; | |
264 | } | |
265 | ||
266 | return 0; | |
267 | } | |
268 | ||
269 | static int pinconf_pins_open(struct inode *inode, struct file *file) | |
270 | { | |
271 | return single_open(file, pinconf_pins_show, inode->i_private); | |
272 | } | |
273 | ||
274 | static int pinconf_groups_open(struct inode *inode, struct file *file) | |
275 | { | |
276 | return single_open(file, pinconf_groups_show, inode->i_private); | |
277 | } | |
278 | ||
279 | static const struct file_operations pinconf_pins_ops = { | |
280 | .open = pinconf_pins_open, | |
281 | .read = seq_read, | |
282 | .llseek = seq_lseek, | |
283 | .release = single_release, | |
284 | }; | |
285 | ||
286 | static const struct file_operations pinconf_groups_ops = { | |
287 | .open = pinconf_groups_open, | |
288 | .read = seq_read, | |
289 | .llseek = seq_lseek, | |
290 | .release = single_release, | |
291 | }; | |
292 | ||
293 | void pinconf_init_device_debugfs(struct dentry *devroot, | |
294 | struct pinctrl_dev *pctldev) | |
295 | { | |
296 | debugfs_create_file("pinconf-pins", S_IFREG | S_IRUGO, | |
297 | devroot, pctldev, &pinconf_pins_ops); | |
298 | debugfs_create_file("pinconf-groups", S_IFREG | S_IRUGO, | |
299 | devroot, pctldev, &pinconf_groups_ops); | |
300 | } | |
301 | ||
302 | #endif |