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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", NULL, false),
34 PCONFDUMP(PIN_CONFIG_BIAS_PULL_PIN_DEFAULT,
35 "input bias pull to pin specific state", NULL, false),
36 PCONFDUMP(PIN_CONFIG_BIAS_PULL_UP, "input bias pull up", NULL, false),
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_LOW_POWER_MODE, "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_POWER_SOURCE, "pin power source", "selector", true),
50 PCONFDUMP(PIN_CONFIG_SLEEP_HARDWARE_STATE, "sleep hardware state", NULL, false),
51 PCONFDUMP(PIN_CONFIG_SLEW_RATE, "slew rate", NULL, true),
52 PCONFDUMP(PIN_CONFIG_SKEW_DELAY, "skew delay", NULL, true),
53};
54
55static void pinconf_generic_dump_one(struct pinctrl_dev *pctldev,
56 struct seq_file *s, const char *gname,
57 unsigned pin,
58 const struct pin_config_item *items,
59 int nitems, int *print_sep)
60{
61 int i;
62
63 for (i = 0; i < nitems; i++) {
64 unsigned long config;
65 int ret;
66
67
68 config = pinconf_to_config_packed(items[i].param, 0);
69 if (gname)
70 ret = pin_config_group_get(dev_name(pctldev->dev),
71 gname, &config);
72 else
73 ret = pin_config_get_for_pin(pctldev, pin, &config);
74
75 if (ret == -EINVAL || ret == -ENOTSUPP)
76 continue;
77 if (ret) {
78 seq_printf(s, "ERROR READING CONFIG SETTING %d ", i);
79 continue;
80 }
81
82 if (*print_sep)
83 seq_puts(s, ", ");
84 *print_sep = 1;
85 seq_puts(s, items[i].display);
86
87 if (items[i].has_arg) {
88 seq_printf(s, " (%u",
89 pinconf_to_config_argument(config));
90 if (items[i].format)
91 seq_printf(s, " %s)", items[i].format);
92 else
93 seq_puts(s, ")");
94 }
95 }
96}
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108
109void pinconf_generic_dump_pins(struct pinctrl_dev *pctldev, struct seq_file *s,
110 const char *gname, unsigned pin)
111{
112 const struct pinconf_ops *ops = pctldev->desc->confops;
113 int print_sep = 0;
114
115 if (!ops->is_generic)
116 return;
117
118
119 pinconf_generic_dump_one(pctldev, s, gname, pin, conf_items,
120 ARRAY_SIZE(conf_items), &print_sep);
121
122 if (pctldev->desc->num_custom_params &&
123 pctldev->desc->custom_conf_items)
124 pinconf_generic_dump_one(pctldev, s, gname, pin,
125 pctldev->desc->custom_conf_items,
126 pctldev->desc->num_custom_params,
127 &print_sep);
128}
129
130void pinconf_generic_dump_config(struct pinctrl_dev *pctldev,
131 struct seq_file *s, unsigned long config)
132{
133 int i;
134
135 for (i = 0; i < ARRAY_SIZE(conf_items); i++) {
136 if (pinconf_to_config_param(config) != conf_items[i].param)
137 continue;
138 seq_printf(s, "%s: 0x%x", conf_items[i].display,
139 pinconf_to_config_argument(config));
140 }
141
142 if (!pctldev->desc->num_custom_params ||
143 !pctldev->desc->custom_conf_items)
144 return;
145
146 for (i = 0; i < pctldev->desc->num_custom_params; i++) {
147 if (pinconf_to_config_param(config) !=
148 pctldev->desc->custom_conf_items[i].param)
149 continue;
150 seq_printf(s, "%s: 0x%x",
151 pctldev->desc->custom_conf_items[i].display,
152 pinconf_to_config_argument(config));
153 }
154}
155EXPORT_SYMBOL_GPL(pinconf_generic_dump_config);
156#endif
157
158#ifdef CONFIG_OF
159static const struct pinconf_generic_params dt_params[] = {
160 { "bias-bus-hold", PIN_CONFIG_BIAS_BUS_HOLD, 0 },
161 { "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 },
162 { "bias-high-impedance", PIN_CONFIG_BIAS_HIGH_IMPEDANCE, 0 },
163 { "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP, 1 },
164 { "bias-pull-pin-default", PIN_CONFIG_BIAS_PULL_PIN_DEFAULT, 1 },
165 { "bias-pull-down", PIN_CONFIG_BIAS_PULL_DOWN, 1 },
166 { "drive-open-drain", PIN_CONFIG_DRIVE_OPEN_DRAIN, 0 },
167 { "drive-open-source", PIN_CONFIG_DRIVE_OPEN_SOURCE, 0 },
168 { "drive-push-pull", PIN_CONFIG_DRIVE_PUSH_PULL, 0 },
169 { "drive-strength", PIN_CONFIG_DRIVE_STRENGTH, 0 },
170 { "drive-strength-microamp", PIN_CONFIG_DRIVE_STRENGTH_UA, 0 },
171 { "input-debounce", PIN_CONFIG_INPUT_DEBOUNCE, 0 },
172 { "input-disable", PIN_CONFIG_INPUT_ENABLE, 0 },
173 { "input-enable", PIN_CONFIG_INPUT_ENABLE, 1 },
174 { "input-schmitt", PIN_CONFIG_INPUT_SCHMITT, 0 },
175 { "input-schmitt-disable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 0 },
176 { "input-schmitt-enable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 1 },
177 { "low-power-disable", PIN_CONFIG_LOW_POWER_MODE, 0 },
178 { "low-power-enable", PIN_CONFIG_LOW_POWER_MODE, 1 },
179 { "output-disable", PIN_CONFIG_OUTPUT_ENABLE, 0 },
180 { "output-enable", PIN_CONFIG_OUTPUT_ENABLE, 1 },
181 { "output-high", PIN_CONFIG_OUTPUT, 1, },
182 { "output-low", PIN_CONFIG_OUTPUT, 0, },
183 { "power-source", PIN_CONFIG_POWER_SOURCE, 0 },
184 { "sleep-hardware-state", PIN_CONFIG_SLEEP_HARDWARE_STATE, 0 },
185 { "slew-rate", PIN_CONFIG_SLEW_RATE, 0 },
186 { "skew-delay", PIN_CONFIG_SKEW_DELAY, 0 },
187};
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201
202static void parse_dt_cfg(struct device_node *np,
203 const struct pinconf_generic_params *params,
204 unsigned int count, unsigned long *cfg,
205 unsigned int *ncfg)
206{
207 int i;
208
209 for (i = 0; i < count; i++) {
210 u32 val;
211 int ret;
212 const struct pinconf_generic_params *par = ¶ms[i];
213
214 ret = of_property_read_u32(np, par->property, &val);
215
216
217 if (ret == -EINVAL)
218 continue;
219
220
221 if (ret)
222 val = par->default_value;
223
224 pr_debug("found %s with value %u\n", par->property, val);
225 cfg[*ncfg] = pinconf_to_config_packed(par->param, val);
226 (*ncfg)++;
227 }
228}
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236
237
238int pinconf_generic_parse_dt_config(struct device_node *np,
239 struct pinctrl_dev *pctldev,
240 unsigned long **configs,
241 unsigned int *nconfigs)
242{
243 unsigned long *cfg;
244 unsigned int max_cfg, ncfg = 0;
245 int ret;
246
247 if (!np)
248 return -EINVAL;
249
250
251 max_cfg = ARRAY_SIZE(dt_params);
252 if (pctldev)
253 max_cfg += pctldev->desc->num_custom_params;
254 cfg = kcalloc(max_cfg, sizeof(*cfg), GFP_KERNEL);
255 if (!cfg)
256 return -ENOMEM;
257
258 parse_dt_cfg(np, dt_params, ARRAY_SIZE(dt_params), cfg, &ncfg);
259 if (pctldev && pctldev->desc->num_custom_params &&
260 pctldev->desc->custom_params)
261 parse_dt_cfg(np, pctldev->desc->custom_params,
262 pctldev->desc->num_custom_params, cfg, &ncfg);
263
264 ret = 0;
265
266
267 if (ncfg == 0) {
268 *configs = NULL;
269 *nconfigs = 0;
270 goto out;
271 }
272
273
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276
277 *configs = kmemdup(cfg, ncfg * sizeof(unsigned long), GFP_KERNEL);
278 if (!*configs) {
279 ret = -ENOMEM;
280 goto out;
281 }
282
283 *nconfigs = ncfg;
284
285out:
286 kfree(cfg);
287 return ret;
288}
289EXPORT_SYMBOL_GPL(pinconf_generic_parse_dt_config);
290
291int pinconf_generic_dt_subnode_to_map(struct pinctrl_dev *pctldev,
292 struct device_node *np, struct pinctrl_map **map,
293 unsigned *reserved_maps, unsigned *num_maps,
294 enum pinctrl_map_type type)
295{
296 int ret;
297 const char *function;
298 struct device *dev = pctldev->dev;
299 unsigned long *configs = NULL;
300 unsigned num_configs = 0;
301 unsigned reserve, strings_count;
302 struct property *prop;
303 const char *group;
304 const char *subnode_target_type = "pins";
305
306 ret = of_property_count_strings(np, "pins");
307 if (ret < 0) {
308 ret = of_property_count_strings(np, "groups");
309 if (ret < 0)
310
311 return 0;
312 if (type == PIN_MAP_TYPE_INVALID)
313 type = PIN_MAP_TYPE_CONFIGS_GROUP;
314 subnode_target_type = "groups";
315 } else {
316 if (type == PIN_MAP_TYPE_INVALID)
317 type = PIN_MAP_TYPE_CONFIGS_PIN;
318 }
319 strings_count = ret;
320
321 ret = of_property_read_string(np, "function", &function);
322 if (ret < 0) {
323
324 if (ret != -EINVAL)
325 dev_err(dev, "%pOF: could not parse property function\n",
326 np);
327 function = NULL;
328 }
329
330 ret = pinconf_generic_parse_dt_config(np, pctldev, &configs,
331 &num_configs);
332 if (ret < 0) {
333 dev_err(dev, "%pOF: could not parse node property\n", np);
334 return ret;
335 }
336
337 reserve = 0;
338 if (function != NULL)
339 reserve++;
340 if (num_configs)
341 reserve++;
342
343 reserve *= strings_count;
344
345 ret = pinctrl_utils_reserve_map(pctldev, map, reserved_maps,
346 num_maps, reserve);
347 if (ret < 0)
348 goto exit;
349
350 of_property_for_each_string(np, subnode_target_type, prop, group) {
351 if (function) {
352 ret = pinctrl_utils_add_map_mux(pctldev, map,
353 reserved_maps, num_maps, group,
354 function);
355 if (ret < 0)
356 goto exit;
357 }
358
359 if (num_configs) {
360 ret = pinctrl_utils_add_map_configs(pctldev, map,
361 reserved_maps, num_maps, group, configs,
362 num_configs, type);
363 if (ret < 0)
364 goto exit;
365 }
366 }
367 ret = 0;
368
369exit:
370 kfree(configs);
371 return ret;
372}
373EXPORT_SYMBOL_GPL(pinconf_generic_dt_subnode_to_map);
374
375int pinconf_generic_dt_node_to_map(struct pinctrl_dev *pctldev,
376 struct device_node *np_config, struct pinctrl_map **map,
377 unsigned *num_maps, enum pinctrl_map_type type)
378{
379 unsigned reserved_maps;
380 struct device_node *np;
381 int ret;
382
383 reserved_maps = 0;
384 *map = NULL;
385 *num_maps = 0;
386
387 ret = pinconf_generic_dt_subnode_to_map(pctldev, np_config, map,
388 &reserved_maps, num_maps, type);
389 if (ret < 0)
390 goto exit;
391
392 for_each_available_child_of_node(np_config, np) {
393 ret = pinconf_generic_dt_subnode_to_map(pctldev, np, map,
394 &reserved_maps, num_maps, type);
395 if (ret < 0)
396 goto exit;
397 }
398 return 0;
399
400exit:
401 pinctrl_utils_free_map(pctldev, *map, *num_maps);
402 return ret;
403}
404EXPORT_SYMBOL_GPL(pinconf_generic_dt_node_to_map);
405
406void pinconf_generic_dt_free_map(struct pinctrl_dev *pctldev,
407 struct pinctrl_map *map,
408 unsigned num_maps)
409{
410 pinctrl_utils_free_map(pctldev, map, num_maps);
411}
412EXPORT_SYMBOL_GPL(pinconf_generic_dt_free_map);
413
414#endif
415
