1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
|
/* Copyright (c) 2015-2016, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/gpio.h>
#include <linux/of_gpio.h>
#include <linux/platform_device.h>
#include "msm-audio-pinctrl.h"
/*
* pinctrl -- handle to query pinctrl apis
* cdc lines -- stores pinctrl handles for pinctrl states
* active_set -- maintain the overall pinctrl state
*/
struct cdc_pinctrl_info {
struct pinctrl *pinctrl;
struct pinctrl_state **cdc_lines;
int active_set;
};
/*
* gpiosets -- stores all gpiosets mentioned in dtsi file
* gpiosets_comb_names -- stores all possible gpioset combinations
* gpioset_state -- maintains counter for each gpioset
* gpiosets_max -- maintain the total supported gpiosets
* gpiosets_comb_max -- maintain the total gpiosets combinations
*/
struct cdc_gpioset_info {
char **gpiosets;
char **gpiosets_comb_names;
uint8_t *gpioset_state;
int gpiosets_max;
int gpiosets_comb_max;
};
static struct cdc_pinctrl_info pinctrl_info[MAX_PINCTRL_CLIENT];
static struct cdc_gpioset_info gpioset_info[MAX_PINCTRL_CLIENT];
/* Finds the index for the gpio set in the dtsi file */
int msm_get_gpioset_index(enum pinctrl_client client, char *keyword)
{
int i;
for (i = 0; i < gpioset_info[client].gpiosets_max; i++) {
if (!(strcmp(gpioset_info[client].gpiosets[i], keyword)))
break;
}
/* Checking if the keyword is present in dtsi or not */
if (i != gpioset_info[client].gpiosets_max)
return i;
else
return -EINVAL;
}
/*
* This function reads the following from dtsi file
* 1. All gpio sets
* 2. All combinations of gpio sets
* 3. Pinctrl handles to gpio sets
*
* Returns error if there is
* 1. Problem reading from dtsi file
* 2. Memory allocation failure
*/
int msm_gpioset_initialize(enum pinctrl_client client,
struct device *dev)
{
struct pinctrl *pinctrl;
const char *gpioset_names = "qcom,msm-gpios";
const char *gpioset_combinations = "qcom,pinctrl-names";
const char *gpioset_names_str = NULL;
const char *gpioset_comb_str = NULL;
int num_strings = 0;
int ret = 0;
int i = 0;
pr_debug("%s\n", __func__);
pinctrl = devm_pinctrl_get(dev);
if (IS_ERR(pinctrl)) {
pr_err("%s: Unable to get pinctrl handle\n",
__func__);
return -EINVAL;
}
pinctrl_info[client].pinctrl = pinctrl;
/* Reading of gpio sets */
num_strings = of_property_count_strings(dev->of_node,
gpioset_names);
if (num_strings < 0) {
dev_err(dev,
"%s: missing %s in dt node or length is incorrect\n",
__func__, gpioset_names);
goto err;
}
gpioset_info[client].gpiosets_max = num_strings;
gpioset_info[client].gpiosets = devm_kzalloc(dev,
gpioset_info[client].gpiosets_max *
sizeof(char *), GFP_KERNEL);
if (!gpioset_info[client].gpiosets) {
dev_err(dev, "Can't allocate memory for gpio set names\n");
ret = -ENOMEM;
goto err;
}
for (i = 0; i < num_strings; i++) {
ret = of_property_read_string_index(dev->of_node,
gpioset_names, i, &gpioset_names_str);
gpioset_info[client].gpiosets[i] = devm_kzalloc(dev,
(strlen(gpioset_names_str) + 1), GFP_KERNEL);
if (!gpioset_info[client].gpiosets[i]) {
dev_err(dev, "%s: Can't allocate gpiosets[%d] data\n",
__func__, i);
ret = -ENOMEM;
goto err;
}
strlcpy(gpioset_info[client].gpiosets[i],
gpioset_names_str, strlen(gpioset_names_str)+1);
gpioset_names_str = NULL;
}
num_strings = 0;
/* Allocating memory for gpio set counter */
gpioset_info[client].gpioset_state = devm_kzalloc(dev,
gpioset_info[client].gpiosets_max *
sizeof(uint8_t), GFP_KERNEL);
if (!gpioset_info[client].gpioset_state) {
dev_err(dev, "Can't allocate memory for gpio set counter\n");
ret = -ENOMEM;
goto err;
}
/* Reading of all combinations of gpio sets */
num_strings = of_property_count_strings(dev->of_node,
gpioset_combinations);
if (num_strings < 0) {
dev_err(dev,
"%s: missing %s in dt node or length is incorrect\n",
__func__, gpioset_combinations);
goto err;
}
gpioset_info[client].gpiosets_comb_max = num_strings;
gpioset_info[client].gpiosets_comb_names = devm_kzalloc(dev,
num_strings * sizeof(char *), GFP_KERNEL);
if (!gpioset_info[client].gpiosets_comb_names) {
ret = -ENOMEM;
goto err;
}
for (i = 0; i < gpioset_info[client].gpiosets_comb_max; i++) {
ret = of_property_read_string_index(dev->of_node,
gpioset_combinations, i, &gpioset_comb_str);
gpioset_info[client].gpiosets_comb_names[i] = devm_kzalloc(dev,
(strlen(gpioset_comb_str) + 1), GFP_KERNEL);
if (!gpioset_info[client].gpiosets_comb_names[i]) {
ret = -ENOMEM;
goto err;
}
strlcpy(gpioset_info[client].gpiosets_comb_names[i],
gpioset_comb_str,
strlen(gpioset_comb_str)+1);
pr_debug("%s: GPIO configuration %s\n",
__func__,
gpioset_info[client].gpiosets_comb_names[i]);
gpioset_comb_str = NULL;
}
/* Allocating memory for handles to pinctrl states */
pinctrl_info[client].cdc_lines = devm_kzalloc(dev,
num_strings * sizeof(char *), GFP_KERNEL);
if (!pinctrl_info[client].cdc_lines) {
ret = -ENOMEM;
goto err;
}
/* Get pinctrl handles for gpio sets in dtsi file */
for (i = 0; i < num_strings; i++) {
pinctrl_info[client].cdc_lines[i] = pinctrl_lookup_state(
pinctrl,
(const char *)gpioset_info[client].
gpiosets_comb_names[i]);
if (IS_ERR(pinctrl_info[client].cdc_lines[i]))
pr_err("%s: Unable to get pinctrl handle for %s\n",
__func__, gpioset_info[client].
gpiosets_comb_names[i]);
}
goto success;
err:
/* Free up memory allocated for gpio set combinations */
for (i = 0; i < gpioset_info[client].gpiosets_max; i++) {
if (gpioset_info[client].gpiosets[i] != NULL) {
devm_kfree(dev, gpioset_info[client].gpiosets[i]);
gpioset_info[client].gpiosets[i] = NULL;
}
}
if (gpioset_info[client].gpiosets != NULL) {
devm_kfree(dev, gpioset_info[client].gpiosets);
gpioset_info[client].gpiosets = NULL;
}
/* Free up memory allocated for gpio set combinations */
for (i = 0; i < gpioset_info[client].gpiosets_comb_max; i++) {
if (gpioset_info[client].gpiosets_comb_names[i] != NULL) {
devm_kfree(dev,
gpioset_info[client].gpiosets_comb_names[i]);
gpioset_info[client].gpiosets_comb_names[i] = NULL;
}
}
if (gpioset_info[client].gpiosets_comb_names != NULL) {
devm_kfree(dev, gpioset_info[client].gpiosets_comb_names);
gpioset_info[client].gpiosets_comb_names = NULL;
}
/* Free up memory allocated for handles to pinctrl states */
if (pinctrl_info[client].cdc_lines != NULL) {
devm_kfree(dev, pinctrl_info[client].cdc_lines);
pinctrl_info[client].cdc_lines = NULL;
}
/* Free up memory allocated for counter of gpio sets */
if (gpioset_info[client].gpioset_state != NULL) {
devm_kfree(dev, gpioset_info[client].gpioset_state);
gpioset_info[client].gpioset_state = NULL;
}
success:
return ret;
}
int msm_gpioset_activate(enum pinctrl_client client, char *keyword)
{
int ret = 0;
int gp_set = 0;
int active_set = 0;
gp_set = msm_get_gpioset_index(client, keyword);
if (gp_set < 0) {
pr_err("%s: gpio set name does not exist\n",
__func__);
return gp_set;
}
if (!gpioset_info[client].gpioset_state[gp_set]) {
/*
* If pinctrl pointer is not valid,
* no need to proceed further
*/
active_set = pinctrl_info[client].active_set;
if (IS_ERR(pinctrl_info[client].cdc_lines[active_set]))
return 0;
pinctrl_info[client].active_set |= (1 << gp_set);
active_set = pinctrl_info[client].active_set;
pr_debug("%s: pinctrl.active_set: %d\n", __func__, active_set);
/* Select the appropriate pinctrl state */
ret = pinctrl_select_state(pinctrl_info[client].pinctrl,
pinctrl_info[client].cdc_lines[active_set]);
}
gpioset_info[client].gpioset_state[gp_set]++;
return ret;
}
int msm_gpioset_suspend(enum pinctrl_client client, char *keyword)
{
int ret = 0;
int gp_set = 0;
int active_set = 0;
gp_set = msm_get_gpioset_index(client, keyword);
if (gp_set < 0) {
pr_err("%s: gpio set name does not exist\n",
__func__);
return gp_set;
}
if (1 == gpioset_info[client].gpioset_state[gp_set]) {
pinctrl_info[client].active_set &= ~(1 << gp_set);
/*
* If pinctrl pointer is not valid,
* no need to proceed further
*/
active_set = pinctrl_info[client].active_set;
if (IS_ERR(pinctrl_info[client].cdc_lines[active_set]))
return -EINVAL;
pr_debug("%s: pinctrl.active_set: %d\n", __func__,
pinctrl_info[client].active_set);
/* Select the appropriate pinctrl state */
ret = pinctrl_select_state(pinctrl_info[client].pinctrl,
pinctrl_info[client].cdc_lines[pinctrl_info[client].
active_set]);
}
if (!(gpioset_info[client].gpioset_state[gp_set])) {
pr_err("%s: Invalid call to de activate gpios: %d\n", __func__,
gpioset_info[client].gpioset_state[gp_set]);
return -EINVAL;
}
gpioset_info[client].gpioset_state[gp_set]--;
return ret;
}
|
