Loading...
Note: File does not exist in v3.1.
1/*
2 * Core driver for the generic 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
12#define pr_fmt(fmt) "generic pinconfig core: " fmt
13
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/init.h>
17#include <linux/device.h>
18#include <linux/slab.h>
19#include <linux/debugfs.h>
20#include <linux/seq_file.h>
21#include <linux/pinctrl/pinctrl.h>
22#include <linux/pinctrl/pinconf.h>
23#include <linux/pinctrl/pinconf-generic.h>
24#include <linux/of.h>
25#include "core.h"
26#include "pinconf.h"
27#include "pinctrl-utils.h"
28
29#ifdef CONFIG_DEBUG_FS
30static const struct pin_config_item conf_items[] = {
31 PCONFDUMP(PIN_CONFIG_BIAS_BUS_HOLD, "input bias bus hold", NULL, false),
32 PCONFDUMP(PIN_CONFIG_BIAS_DISABLE, "input bias disabled", NULL, false),
33 PCONFDUMP(PIN_CONFIG_BIAS_HIGH_IMPEDANCE, "input bias high impedance", NULL, false),
34 PCONFDUMP(PIN_CONFIG_BIAS_PULL_DOWN, "input bias pull down", NULL, false),
35 PCONFDUMP(PIN_CONFIG_BIAS_PULL_PIN_DEFAULT,
36 "input bias pull to pin specific state", NULL, false),
37 PCONFDUMP(PIN_CONFIG_BIAS_PULL_UP, "input bias pull up", NULL, false),
38 PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_DRAIN, "output drive open drain", NULL, false),
39 PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_SOURCE, "output drive open source", NULL, false),
40 PCONFDUMP(PIN_CONFIG_DRIVE_PUSH_PULL, "output drive push pull", NULL, false),
41 PCONFDUMP(PIN_CONFIG_DRIVE_STRENGTH, "output drive strength", "mA", 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, "pin output", "level", true),
48 PCONFDUMP(PIN_CONFIG_POWER_SOURCE, "pin power source", "selector", true),
49 PCONFDUMP(PIN_CONFIG_SLEW_RATE, "slew rate", NULL, true),
50};
51
52static void pinconf_generic_dump_one(struct pinctrl_dev *pctldev,
53 struct seq_file *s, const char *gname,
54 unsigned pin,
55 const struct pin_config_item *items,
56 int nitems, int *print_sep)
57{
58 int i;
59
60 for (i = 0; i < nitems; i++) {
61 unsigned long config;
62 int ret;
63
64 /* We want to check out this parameter */
65 config = pinconf_to_config_packed(items[i].param, 0);
66 if (gname)
67 ret = pin_config_group_get(dev_name(pctldev->dev),
68 gname, &config);
69 else
70 ret = pin_config_get_for_pin(pctldev, pin, &config);
71 /* These are legal errors */
72 if (ret == -EINVAL || ret == -ENOTSUPP)
73 continue;
74 if (ret) {
75 seq_printf(s, "ERROR READING CONFIG SETTING %d ", i);
76 continue;
77 }
78 /* comma between multiple configs */
79 if (*print_sep)
80 seq_puts(s, ", ");
81 *print_sep = 1;
82 seq_puts(s, items[i].display);
83 /* Print unit if available */
84 if (items[i].has_arg) {
85 seq_printf(s, " (%u",
86 pinconf_to_config_argument(config));
87 if (items[i].format)
88 seq_printf(s, " %s)", items[i].format);
89 else
90 seq_puts(s, ")");
91 }
92 }
93}
94
95/**
96 * pinconf_generic_dump_pins - Print information about pin or group of pins
97 * @pctldev: Pincontrol device
98 * @s: File to print to
99 * @gname: Group name specifying pins
100 * @pin: Pin number specyfying pin
101 *
102 * Print the pinconf configuration for the requested pin(s) to @s. Pins can be
103 * specified either by pin using @pin or by group using @gname. Only one needs
104 * to be specified the other can be NULL/0.
105 */
106void pinconf_generic_dump_pins(struct pinctrl_dev *pctldev, struct seq_file *s,
107 const char *gname, unsigned pin)
108{
109 const struct pinconf_ops *ops = pctldev->desc->confops;
110 int print_sep = 0;
111
112 if (!ops->is_generic)
113 return;
114
115 /* generic parameters */
116 pinconf_generic_dump_one(pctldev, s, gname, pin, conf_items,
117 ARRAY_SIZE(conf_items), &print_sep);
118 /* driver-specific parameters */
119 if (pctldev->desc->num_custom_params &&
120 pctldev->desc->custom_conf_items)
121 pinconf_generic_dump_one(pctldev, s, gname, pin,
122 pctldev->desc->custom_conf_items,
123 pctldev->desc->num_custom_params,
124 &print_sep);
125}
126
127void pinconf_generic_dump_config(struct pinctrl_dev *pctldev,
128 struct seq_file *s, unsigned long config)
129{
130 int i;
131
132 for (i = 0; i < ARRAY_SIZE(conf_items); i++) {
133 if (pinconf_to_config_param(config) != conf_items[i].param)
134 continue;
135 seq_printf(s, "%s: 0x%x", conf_items[i].display,
136 pinconf_to_config_argument(config));
137 }
138
139 if (!pctldev->desc->num_custom_params ||
140 !pctldev->desc->custom_conf_items)
141 return;
142
143 for (i = 0; i < pctldev->desc->num_custom_params; i++) {
144 if (pinconf_to_config_param(config) !=
145 pctldev->desc->custom_conf_items[i].param)
146 continue;
147 seq_printf(s, "%s: 0x%x",
148 pctldev->desc->custom_conf_items[i].display,
149 pinconf_to_config_argument(config));
150 }
151}
152EXPORT_SYMBOL_GPL(pinconf_generic_dump_config);
153#endif
154
155#ifdef CONFIG_OF
156static const struct pinconf_generic_params dt_params[] = {
157 { "bias-bus-hold", PIN_CONFIG_BIAS_BUS_HOLD, 0 },
158 { "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 },
159 { "bias-high-impedance", PIN_CONFIG_BIAS_HIGH_IMPEDANCE, 0 },
160 { "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP, 1 },
161 { "bias-pull-pin-default", PIN_CONFIG_BIAS_PULL_PIN_DEFAULT, 1 },
162 { "bias-pull-down", PIN_CONFIG_BIAS_PULL_DOWN, 1 },
163 { "drive-open-drain", PIN_CONFIG_DRIVE_OPEN_DRAIN, 0 },
164 { "drive-open-source", PIN_CONFIG_DRIVE_OPEN_SOURCE, 0 },
165 { "drive-push-pull", PIN_CONFIG_DRIVE_PUSH_PULL, 0 },
166 { "drive-strength", PIN_CONFIG_DRIVE_STRENGTH, 0 },
167 { "input-debounce", PIN_CONFIG_INPUT_DEBOUNCE, 0 },
168 { "input-disable", PIN_CONFIG_INPUT_ENABLE, 0 },
169 { "input-enable", PIN_CONFIG_INPUT_ENABLE, 1 },
170 { "input-schmitt", PIN_CONFIG_INPUT_SCHMITT, 0 },
171 { "input-schmitt-disable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 0 },
172 { "input-schmitt-enable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 1 },
173 { "low-power-disable", PIN_CONFIG_LOW_POWER_MODE, 0 },
174 { "low-power-enable", PIN_CONFIG_LOW_POWER_MODE, 1 },
175 { "output-high", PIN_CONFIG_OUTPUT, 1, },
176 { "output-low", PIN_CONFIG_OUTPUT, 0, },
177 { "power-source", PIN_CONFIG_POWER_SOURCE, 0 },
178 { "slew-rate", PIN_CONFIG_SLEW_RATE, 0 },
179};
180
181/**
182 * parse_dt_cfg() - Parse DT pinconf parameters
183 * @np: DT node
184 * @params: Array of describing generic parameters
185 * @count: Number of entries in @params
186 * @cfg: Array of parsed config options
187 * @ncfg: Number of entries in @cfg
188 *
189 * Parse the config options described in @params from @np and puts the result
190 * in @cfg. @cfg does not need to be empty, entries are added beggining at
191 * @ncfg. @ncfg is updated to reflect the number of entries after parsing. @cfg
192 * needs to have enough memory allocated to hold all possible entries.
193 */
194static void parse_dt_cfg(struct device_node *np,
195 const struct pinconf_generic_params *params,
196 unsigned int count, unsigned long *cfg,
197 unsigned int *ncfg)
198{
199 int i;
200
201 for (i = 0; i < count; i++) {
202 u32 val;
203 int ret;
204 const struct pinconf_generic_params *par = ¶ms[i];
205
206 ret = of_property_read_u32(np, par->property, &val);
207
208 /* property not found */
209 if (ret == -EINVAL)
210 continue;
211
212 /* use default value, when no value is specified */
213 if (ret)
214 val = par->default_value;
215
216 pr_debug("found %s with value %u\n", par->property, val);
217 cfg[*ncfg] = pinconf_to_config_packed(par->param, val);
218 (*ncfg)++;
219 }
220}
221
222/**
223 * pinconf_generic_parse_dt_config()
224 * parse the config properties into generic pinconfig values.
225 * @np: node containing the pinconfig properties
226 * @configs: array with nconfigs entries containing the generic pinconf values
227 * must be freed when no longer necessary.
228 * @nconfigs: umber of configurations
229 */
230int pinconf_generic_parse_dt_config(struct device_node *np,
231 struct pinctrl_dev *pctldev,
232 unsigned long **configs,
233 unsigned int *nconfigs)
234{
235 unsigned long *cfg;
236 unsigned int max_cfg, ncfg = 0;
237 int ret;
238
239 if (!np)
240 return -EINVAL;
241
242 /* allocate a temporary array big enough to hold one of each option */
243 max_cfg = ARRAY_SIZE(dt_params);
244 if (pctldev)
245 max_cfg += pctldev->desc->num_custom_params;
246 cfg = kcalloc(max_cfg, sizeof(*cfg), GFP_KERNEL);
247 if (!cfg)
248 return -ENOMEM;
249
250 parse_dt_cfg(np, dt_params, ARRAY_SIZE(dt_params), cfg, &ncfg);
251 if (pctldev && pctldev->desc->num_custom_params &&
252 pctldev->desc->custom_params)
253 parse_dt_cfg(np, pctldev->desc->custom_params,
254 pctldev->desc->num_custom_params, cfg, &ncfg);
255
256 ret = 0;
257
258 /* no configs found at all */
259 if (ncfg == 0) {
260 *configs = NULL;
261 *nconfigs = 0;
262 goto out;
263 }
264
265 /*
266 * Now limit the number of configs to the real number of
267 * found properties.
268 */
269 *configs = kmemdup(cfg, ncfg * sizeof(unsigned long), GFP_KERNEL);
270 if (!*configs) {
271 ret = -ENOMEM;
272 goto out;
273 }
274
275 *nconfigs = ncfg;
276
277out:
278 kfree(cfg);
279 return ret;
280}
281
282int pinconf_generic_dt_subnode_to_map(struct pinctrl_dev *pctldev,
283 struct device_node *np, struct pinctrl_map **map,
284 unsigned *reserved_maps, unsigned *num_maps,
285 enum pinctrl_map_type type)
286{
287 int ret;
288 const char *function;
289 struct device *dev = pctldev->dev;
290 unsigned long *configs = NULL;
291 unsigned num_configs = 0;
292 unsigned reserve, strings_count;
293 struct property *prop;
294 const char *group;
295 const char *subnode_target_type = "pins";
296
297 ret = of_property_count_strings(np, "pins");
298 if (ret < 0) {
299 ret = of_property_count_strings(np, "groups");
300 if (ret < 0)
301 /* skip this node; may contain config child nodes */
302 return 0;
303 if (type == PIN_MAP_TYPE_INVALID)
304 type = PIN_MAP_TYPE_CONFIGS_GROUP;
305 subnode_target_type = "groups";
306 } else {
307 if (type == PIN_MAP_TYPE_INVALID)
308 type = PIN_MAP_TYPE_CONFIGS_PIN;
309 }
310 strings_count = ret;
311
312 ret = of_property_read_string(np, "function", &function);
313 if (ret < 0) {
314 /* EINVAL=missing, which is fine since it's optional */
315 if (ret != -EINVAL)
316 dev_err(dev, "%s: could not parse property function\n",
317 of_node_full_name(np));
318 function = NULL;
319 }
320
321 ret = pinconf_generic_parse_dt_config(np, pctldev, &configs,
322 &num_configs);
323 if (ret < 0) {
324 dev_err(dev, "%s: could not parse node property\n",
325 of_node_full_name(np));
326 return ret;
327 }
328
329 reserve = 0;
330 if (function != NULL)
331 reserve++;
332 if (num_configs)
333 reserve++;
334
335 reserve *= strings_count;
336
337 ret = pinctrl_utils_reserve_map(pctldev, map, reserved_maps,
338 num_maps, reserve);
339 if (ret < 0)
340 goto exit;
341
342 of_property_for_each_string(np, subnode_target_type, prop, group) {
343 if (function) {
344 ret = pinctrl_utils_add_map_mux(pctldev, map,
345 reserved_maps, num_maps, group,
346 function);
347 if (ret < 0)
348 goto exit;
349 }
350
351 if (num_configs) {
352 ret = pinctrl_utils_add_map_configs(pctldev, map,
353 reserved_maps, num_maps, group, configs,
354 num_configs, type);
355 if (ret < 0)
356 goto exit;
357 }
358 }
359 ret = 0;
360
361exit:
362 kfree(configs);
363 return ret;
364}
365EXPORT_SYMBOL_GPL(pinconf_generic_dt_subnode_to_map);
366
367int pinconf_generic_dt_node_to_map(struct pinctrl_dev *pctldev,
368 struct device_node *np_config, struct pinctrl_map **map,
369 unsigned *num_maps, enum pinctrl_map_type type)
370{
371 unsigned reserved_maps;
372 struct device_node *np;
373 int ret;
374
375 reserved_maps = 0;
376 *map = NULL;
377 *num_maps = 0;
378
379 ret = pinconf_generic_dt_subnode_to_map(pctldev, np_config, map,
380 &reserved_maps, num_maps, type);
381 if (ret < 0)
382 goto exit;
383
384 for_each_available_child_of_node(np_config, np) {
385 ret = pinconf_generic_dt_subnode_to_map(pctldev, np, map,
386 &reserved_maps, num_maps, type);
387 if (ret < 0)
388 goto exit;
389 }
390 return 0;
391
392exit:
393 pinctrl_utils_free_map(pctldev, *map, *num_maps);
394 return ret;
395}
396EXPORT_SYMBOL_GPL(pinconf_generic_dt_node_to_map);
397
398void pinconf_generic_dt_free_map(struct pinctrl_dev *pctldev,
399 struct pinctrl_map *map,
400 unsigned num_maps)
401{
402 pinctrl_utils_free_map(pctldev, map, num_maps);
403}
404EXPORT_SYMBOL_GPL(pinconf_generic_dt_free_map);
405
406#endif