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11#define pr_fmt(fmt) "generic 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/pinctrl.h>
21#include <linux/pinctrl/pinconf.h>
22#include <linux/pinctrl/pinconf-generic.h>
23#include <linux/of.h>
24#include "core.h"
25#include "pinconf.h"
26#include "pinctrl-utils.h"
27
28#ifdef CONFIG_DEBUG_FS
29static const struct pin_config_item conf_items[] = {
30 PCONFDUMP(PIN_CONFIG_BIAS_BUS_HOLD, "input bias bus hold", NULL, false),
31 PCONFDUMP(PIN_CONFIG_BIAS_DISABLE, "input bias disabled", NULL, false),
32 PCONFDUMP(PIN_CONFIG_BIAS_HIGH_IMPEDANCE, "input bias high impedance", NULL, false),
33 PCONFDUMP(PIN_CONFIG_BIAS_PULL_DOWN, "input bias pull down", "ohms", true),
34 PCONFDUMP(PIN_CONFIG_BIAS_PULL_PIN_DEFAULT,
35 "input bias pull to pin specific state", "ohms", true),
36 PCONFDUMP(PIN_CONFIG_BIAS_PULL_UP, "input bias pull up", "ohms", true),
37 PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_DRAIN, "output drive open drain", NULL, false),
38 PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_SOURCE, "output drive open source", NULL, false),
39 PCONFDUMP(PIN_CONFIG_DRIVE_PUSH_PULL, "output drive push pull", NULL, false),
40 PCONFDUMP(PIN_CONFIG_DRIVE_STRENGTH, "output drive strength", "mA", true),
41 PCONFDUMP(PIN_CONFIG_DRIVE_STRENGTH_UA, "output drive strength", "uA", true),
42 PCONFDUMP(PIN_CONFIG_INPUT_DEBOUNCE, "input debounce", "usec", true),
43 PCONFDUMP(PIN_CONFIG_INPUT_ENABLE, "input enabled", NULL, false),
44 PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT, "input schmitt trigger", NULL, false),
45 PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT_ENABLE, "input schmitt enabled", NULL, false),
46 PCONFDUMP(PIN_CONFIG_MODE_LOW_POWER, "pin low power", "mode", true),
47 PCONFDUMP(PIN_CONFIG_OUTPUT_ENABLE, "output enabled", NULL, false),
48 PCONFDUMP(PIN_CONFIG_OUTPUT, "pin output", "level", true),
49 PCONFDUMP(PIN_CONFIG_OUTPUT_IMPEDANCE_OHMS, "output impedance", "ohms", true),
50 PCONFDUMP(PIN_CONFIG_POWER_SOURCE, "pin power source", "selector", true),
51 PCONFDUMP(PIN_CONFIG_SLEEP_HARDWARE_STATE, "sleep hardware state", NULL, false),
52 PCONFDUMP(PIN_CONFIG_SLEW_RATE, "slew rate", NULL, true),
53 PCONFDUMP(PIN_CONFIG_SKEW_DELAY, "skew delay", NULL, true),
54};
55
56static void pinconf_generic_dump_one(struct pinctrl_dev *pctldev,
57 struct seq_file *s, const char *gname,
58 unsigned pin,
59 const struct pin_config_item *items,
60 int nitems, int *print_sep)
61{
62 int i;
63
64 for (i = 0; i < nitems; i++) {
65 unsigned long config;
66 int ret;
67
68
69 config = pinconf_to_config_packed(items[i].param, 0);
70 if (gname)
71 ret = pin_config_group_get(dev_name(pctldev->dev),
72 gname, &config);
73 else
74 ret = pin_config_get_for_pin(pctldev, pin, &config);
75
76 if (ret == -EINVAL || ret == -ENOTSUPP)
77 continue;
78 if (ret) {
79 seq_printf(s, "ERROR READING CONFIG SETTING %d ", i);
80 continue;
81 }
82
83 if (*print_sep)
84 seq_puts(s, ", ");
85 *print_sep = 1;
86 seq_puts(s, items[i].display);
87
88 if (items[i].has_arg) {
89 seq_printf(s, " (%u",
90 pinconf_to_config_argument(config));
91 if (items[i].format)
92 seq_printf(s, " %s)", items[i].format);
93 else
94 seq_puts(s, ")");
95 }
96 }
97}
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110void pinconf_generic_dump_pins(struct pinctrl_dev *pctldev, struct seq_file *s,
111 const char *gname, unsigned pin)
112{
113 const struct pinconf_ops *ops = pctldev->desc->confops;
114 int print_sep = 0;
115
116 if (!ops->is_generic)
117 return;
118
119
120 pinconf_generic_dump_one(pctldev, s, gname, pin, conf_items,
121 ARRAY_SIZE(conf_items), &print_sep);
122
123 if (pctldev->desc->num_custom_params &&
124 pctldev->desc->custom_conf_items)
125 pinconf_generic_dump_one(pctldev, s, gname, pin,
126 pctldev->desc->custom_conf_items,
127 pctldev->desc->num_custom_params,
128 &print_sep);
129}
130
131void pinconf_generic_dump_config(struct pinctrl_dev *pctldev,
132 struct seq_file *s, unsigned long config)
133{
134 int i;
135
136 for (i = 0; i < ARRAY_SIZE(conf_items); i++) {
137 if (pinconf_to_config_param(config) != conf_items[i].param)
138 continue;
139 seq_printf(s, "%s: 0x%x", conf_items[i].display,
140 pinconf_to_config_argument(config));
141 }
142
143 if (!pctldev->desc->num_custom_params ||
144 !pctldev->desc->custom_conf_items)
145 return;
146
147 for (i = 0; i < pctldev->desc->num_custom_params; i++) {
148 if (pinconf_to_config_param(config) !=
149 pctldev->desc->custom_conf_items[i].param)
150 continue;
151 seq_printf(s, "%s: 0x%x",
152 pctldev->desc->custom_conf_items[i].display,
153 pinconf_to_config_argument(config));
154 }
155}
156EXPORT_SYMBOL_GPL(pinconf_generic_dump_config);
157#endif
158
159#ifdef CONFIG_OF
160static const struct pinconf_generic_params dt_params[] = {
161 { "bias-bus-hold", PIN_CONFIG_BIAS_BUS_HOLD, 0 },
162 { "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 },
163 { "bias-high-impedance", PIN_CONFIG_BIAS_HIGH_IMPEDANCE, 0 },
164 { "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP, 1 },
165 { "bias-pull-pin-default", PIN_CONFIG_BIAS_PULL_PIN_DEFAULT, 1 },
166 { "bias-pull-down", PIN_CONFIG_BIAS_PULL_DOWN, 1 },
167 { "drive-open-drain", PIN_CONFIG_DRIVE_OPEN_DRAIN, 0 },
168 { "drive-open-source", PIN_CONFIG_DRIVE_OPEN_SOURCE, 0 },
169 { "drive-push-pull", PIN_CONFIG_DRIVE_PUSH_PULL, 0 },
170 { "drive-strength", PIN_CONFIG_DRIVE_STRENGTH, 0 },
171 { "drive-strength-microamp", PIN_CONFIG_DRIVE_STRENGTH_UA, 0 },
172 { "input-debounce", PIN_CONFIG_INPUT_DEBOUNCE, 0 },
173 { "input-disable", PIN_CONFIG_INPUT_ENABLE, 0 },
174 { "input-enable", PIN_CONFIG_INPUT_ENABLE, 1 },
175 { "input-schmitt", PIN_CONFIG_INPUT_SCHMITT, 0 },
176 { "input-schmitt-disable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 0 },
177 { "input-schmitt-enable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 1 },
178 { "low-power-disable", PIN_CONFIG_MODE_LOW_POWER, 0 },
179 { "low-power-enable", PIN_CONFIG_MODE_LOW_POWER, 1 },
180 { "output-disable", PIN_CONFIG_OUTPUT_ENABLE, 0 },
181 { "output-enable", PIN_CONFIG_OUTPUT_ENABLE, 1 },
182 { "output-high", PIN_CONFIG_OUTPUT, 1, },
183 { "output-impedance-ohms", PIN_CONFIG_OUTPUT_IMPEDANCE_OHMS, 0 },
184 { "output-low", PIN_CONFIG_OUTPUT, 0, },
185 { "power-source", PIN_CONFIG_POWER_SOURCE, 0 },
186 { "sleep-hardware-state", PIN_CONFIG_SLEEP_HARDWARE_STATE, 0 },
187 { "slew-rate", PIN_CONFIG_SLEW_RATE, 0 },
188 { "skew-delay", PIN_CONFIG_SKEW_DELAY, 0 },
189};
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204static void parse_dt_cfg(struct device_node *np,
205 const struct pinconf_generic_params *params,
206 unsigned int count, unsigned long *cfg,
207 unsigned int *ncfg)
208{
209 int i;
210
211 for (i = 0; i < count; i++) {
212 u32 val;
213 int ret;
214 const struct pinconf_generic_params *par = ¶ms[i];
215
216 ret = of_property_read_u32(np, par->property, &val);
217
218
219 if (ret == -EINVAL)
220 continue;
221
222
223 if (ret)
224 val = par->default_value;
225
226 pr_debug("found %s with value %u\n", par->property, val);
227 cfg[*ncfg] = pinconf_to_config_packed(par->param, val);
228 (*ncfg)++;
229 }
230}
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240
241int pinconf_generic_parse_dt_config(struct device_node *np,
242 struct pinctrl_dev *pctldev,
243 unsigned long **configs,
244 unsigned int *nconfigs)
245{
246 unsigned long *cfg;
247 unsigned int max_cfg, ncfg = 0;
248 int ret;
249
250 if (!np)
251 return -EINVAL;
252
253
254 max_cfg = ARRAY_SIZE(dt_params);
255 if (pctldev)
256 max_cfg += pctldev->desc->num_custom_params;
257 cfg = kcalloc(max_cfg, sizeof(*cfg), GFP_KERNEL);
258 if (!cfg)
259 return -ENOMEM;
260
261 parse_dt_cfg(np, dt_params, ARRAY_SIZE(dt_params), cfg, &ncfg);
262 if (pctldev && pctldev->desc->num_custom_params &&
263 pctldev->desc->custom_params)
264 parse_dt_cfg(np, pctldev->desc->custom_params,
265 pctldev->desc->num_custom_params, cfg, &ncfg);
266
267 ret = 0;
268
269
270 if (ncfg == 0) {
271 *configs = NULL;
272 *nconfigs = 0;
273 goto out;
274 }
275
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279
280 *configs = kmemdup(cfg, ncfg * sizeof(unsigned long), GFP_KERNEL);
281 if (!*configs) {
282 ret = -ENOMEM;
283 goto out;
284 }
285
286 *nconfigs = ncfg;
287
288out:
289 kfree(cfg);
290 return ret;
291}
292EXPORT_SYMBOL_GPL(pinconf_generic_parse_dt_config);
293
294int pinconf_generic_dt_subnode_to_map(struct pinctrl_dev *pctldev,
295 struct device_node *np, struct pinctrl_map **map,
296 unsigned *reserved_maps, unsigned *num_maps,
297 enum pinctrl_map_type type)
298{
299 int ret;
300 const char *function;
301 struct device *dev = pctldev->dev;
302 unsigned long *configs = NULL;
303 unsigned num_configs = 0;
304 unsigned reserve, strings_count;
305 struct property *prop;
306 const char *group;
307 const char *subnode_target_type = "pins";
308
309 ret = of_property_count_strings(np, "pins");
310 if (ret < 0) {
311 ret = of_property_count_strings(np, "groups");
312 if (ret < 0)
313
314 return 0;
315 if (type == PIN_MAP_TYPE_INVALID)
316 type = PIN_MAP_TYPE_CONFIGS_GROUP;
317 subnode_target_type = "groups";
318 } else {
319 if (type == PIN_MAP_TYPE_INVALID)
320 type = PIN_MAP_TYPE_CONFIGS_PIN;
321 }
322 strings_count = ret;
323
324 ret = of_property_read_string(np, "function", &function);
325 if (ret < 0) {
326
327 if (ret != -EINVAL)
328 dev_err(dev, "%pOF: could not parse property function\n",
329 np);
330 function = NULL;
331 }
332
333 ret = pinconf_generic_parse_dt_config(np, pctldev, &configs,
334 &num_configs);
335 if (ret < 0) {
336 dev_err(dev, "%pOF: could not parse node property\n", np);
337 return ret;
338 }
339
340 reserve = 0;
341 if (function != NULL)
342 reserve++;
343 if (num_configs)
344 reserve++;
345
346 reserve *= strings_count;
347
348 ret = pinctrl_utils_reserve_map(pctldev, map, reserved_maps,
349 num_maps, reserve);
350 if (ret < 0)
351 goto exit;
352
353 of_property_for_each_string(np, subnode_target_type, prop, group) {
354 if (function) {
355 ret = pinctrl_utils_add_map_mux(pctldev, map,
356 reserved_maps, num_maps, group,
357 function);
358 if (ret < 0)
359 goto exit;
360 }
361
362 if (num_configs) {
363 ret = pinctrl_utils_add_map_configs(pctldev, map,
364 reserved_maps, num_maps, group, configs,
365 num_configs, type);
366 if (ret < 0)
367 goto exit;
368 }
369 }
370 ret = 0;
371
372exit:
373 kfree(configs);
374 return ret;
375}
376EXPORT_SYMBOL_GPL(pinconf_generic_dt_subnode_to_map);
377
378int pinconf_generic_dt_node_to_map(struct pinctrl_dev *pctldev,
379 struct device_node *np_config, struct pinctrl_map **map,
380 unsigned *num_maps, enum pinctrl_map_type type)
381{
382 unsigned reserved_maps;
383 struct device_node *np;
384 int ret;
385
386 reserved_maps = 0;
387 *map = NULL;
388 *num_maps = 0;
389
390 ret = pinconf_generic_dt_subnode_to_map(pctldev, np_config, map,
391 &reserved_maps, num_maps, type);
392 if (ret < 0)
393 goto exit;
394
395 for_each_available_child_of_node(np_config, np) {
396 ret = pinconf_generic_dt_subnode_to_map(pctldev, np, map,
397 &reserved_maps, num_maps, type);
398 if (ret < 0)
399 goto exit;
400 }
401 return 0;
402
403exit:
404 pinctrl_utils_free_map(pctldev, *map, *num_maps);
405 return ret;
406}
407EXPORT_SYMBOL_GPL(pinconf_generic_dt_node_to_map);
408
409void pinconf_generic_dt_free_map(struct pinctrl_dev *pctldev,
410 struct pinctrl_map *map,
411 unsigned num_maps)
412{
413 pinctrl_utils_free_map(pctldev, map, num_maps);
414}
415EXPORT_SYMBOL_GPL(pinconf_generic_dt_free_map);
416
417#endif
418
