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
|
/*
* gsd4t.c (SiRFstarIV)
* GPS driver for SiRFstar based chip.
*
* Copyright (C) 2011 Samsung Electronics
* Minho Ban <mhban@samsung.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
#include <linux/mutex.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/rfkill.h>
#include <linux/regulator/machine.h>
#include <asm/mach-types.h>
#include <mach/gpio.h>
#include <plat/gpio-cfg.h>
#include <mach/gsd4t.h>
struct gsd4t_data {
struct gsd4t_platform_data *pdata;
struct rfkill *rfk;
bool in_use;
/* No need below if constraints is always_on */
struct regulator *vdd_18;
struct regulator *rtc_xi;
};
static int gsd4t_set_block(void *data, bool blocked)
{
struct gsd4t_data *bd = data;
struct gsd4t_platform_data *pdata = bd->pdata;
if (!blocked) {
if (bd->in_use)
return 0;
pr_info("gsd4t on\n");
regulator_enable(bd->vdd_18);
regulator_enable(bd->rtc_xi);
/*
* CSR(SiRF) recommends,
*
* _|^^^|_100ms_|^^^^^^^^^^^^^^^ nrst
* _____________,___200ms___|^^^ onoff
*
*/
gpio_set_value(pdata->nrst, 1);
gpio_set_value(pdata->onoff, 0);
/*
* But real boot sequence should be handled by user layer
* (including download firmware) so we don't need control pins
* here actually.
*
msleep(50);
gpio_set_value(pdata->nrst, 0);
msleep(100);
gpio_set_value(pdata->nrst, 1);
msleep(200);
gpio_set_value(pdata->onoff, 1);
*/
bd->in_use = true;
} else {
if (!bd->in_use)
return 0;
pr_info("gsd4t off\n");
gpio_set_value(pdata->nrst, 0);
regulator_disable(bd->vdd_18);
regulator_disable(bd->rtc_xi);
bd->in_use = false;
}
return 0;
}
static const struct rfkill_ops gsd4t_rfkill_ops = {
.set_block = gsd4t_set_block,
};
static int __devinit gsd4t_probe(struct platform_device *dev)
{
struct gsd4t_platform_data *pdata;
struct gsd4t_data *bd;
unsigned int gpio;
int ret = 0;
pdata = dev->dev.platform_data;
if (!pdata) {
dev_err(&dev->dev, "No platform data.\n");
return -EINVAL;
}
bd = kzalloc(sizeof(struct gsd4t_data), GFP_KERNEL);
if (!bd)
return -ENOMEM;
bd->pdata = pdata;
if (gpio_is_valid(pdata->nrst)) {
gpio = pdata->nrst;
/* GPS_nRST is high */
gpio_request(gpio, "GPS_nRST");
s3c_gpio_cfgpin(gpio, S3C_GPIO_OUTPUT);
gpio_direction_output(gpio, 0);
gpio_export(gpio, 1);
gpio_export_link(&dev->dev, "reset", gpio);
} else {
dev_err(&dev->dev, "Invalid nRST pin\n");
ret = -EINVAL;
goto err_invalid_pin1;
}
if (gpio_is_valid(pdata->onoff)) {
gpio = pdata->onoff;
/* GPS_EN is low */
gpio_request(gpio, "GPS_EN");
s3c_gpio_cfgpin(gpio, S3C_GPIO_OUTPUT);
gpio_direction_output(gpio, 0);
gpio_export(gpio, 1);
gpio_export_link(&dev->dev, "onoff", gpio);
} else {
dev_err(&dev->dev, "Invalid GPS_EN pin\n");
ret = -EINVAL;
goto err_invalid_pin2;
}
/* Optional aiding pin */
if (gpio_is_valid(pdata->tsync)) {
gpio = pdata->tsync;
/* AP_AGPS_TSYNC is low */
gpio_request(gpio, "AP_AGPS_TSYNC");
s3c_gpio_cfgpin(gpio, S3C_GPIO_OUTPUT);
gpio_direction_output(gpio, 0);
gpio_export(gpio, 1);
gpio_export_link(&dev->dev, "tsync", gpio);
}
/* input UART pin need to set pull-up to prevent floating */
if (gpio_is_valid(pdata->uart_rxd))
s3c_gpio_setpull(pdata->uart_rxd, S3C_GPIO_PULL_UP);
/*
* Get regulators.
* If always_on power, can remove below.
*/
bd->rtc_xi = regulator_get(&dev->dev, "gps_clk");
if (IS_ERR_OR_NULL(bd->rtc_xi)) {
dev_err(&dev->dev, "gps_clk regulator_get error\n");
ret = -EINVAL;
goto err_regulator_1;
}
bd->vdd_18 = regulator_get(&dev->dev, "v_gps_1.8v");
if (IS_ERR_OR_NULL(bd->vdd_18)) {
dev_err(&dev->dev, "vdd_18 regulator_get error\n");
ret = -EINVAL;
goto err_regulator_2;
}
/*
* Actually, we don't need rfkill becasue most of power sequences to be
* done by user level. Just leave this to know user trggers onoff so we
* can set pins PDN mode at suspend/resume.
*/
bd->rfk = rfkill_alloc("gsd4t", &dev->dev, RFKILL_TYPE_GPS,
&gsd4t_rfkill_ops, bd);
if (!bd->rfk) {
ret = -ENOMEM;
goto err_rfk_alloc;
}
/*
* rfkill.h
* block true : off
* block false : on
*/
rfkill_init_sw_state(bd->rfk, true);
bd->in_use = false;
ret = rfkill_register(bd->rfk);
if (ret)
goto err_rfkill;
platform_set_drvdata(dev, bd);
dev_info(&dev->dev, "ready\n");
return 0;
err_rfkill:
rfkill_destroy(bd->rfk);
err_rfk_alloc:
regulator_put(bd->vdd_18);
err_regulator_2:
regulator_put(bd->rtc_xi);
err_regulator_1:
gpio_unexport(pdata->tsync);
gpio_unexport(pdata->onoff);
err_invalid_pin2:
gpio_unexport(pdata->nrst);
err_invalid_pin1:
kfree(bd);
return ret;
}
static int __devexit gsd4t_remove(struct platform_device *dev)
{
struct gsd4t_data *bd = platform_get_drvdata(dev);
struct gsd4t_platform_data *pdata = bd->pdata;
if (bd->in_use)
rfkill_init_sw_state(bd->rfk, true);
rfkill_unregister(bd->rfk);
rfkill_destroy(bd->rfk);
gpio_unexport(pdata->onoff);
gpio_unexport(pdata->nrst);
gpio_unexport(pdata->tsync);
gpio_free(pdata->onoff);
gpio_free(pdata->nrst);
regulator_put(bd->vdd_18);
regulator_put(bd->rtc_xi);
kfree(bd);
platform_set_drvdata(dev, NULL);
return 0;
}
#ifdef CONFIG_PM
static int gsd4t_suspend(struct platform_device *dev, pm_message_t stata)
{
struct gsd4t_data *bd = platform_get_drvdata(dev);
struct gsd4t_platform_data *pdata = bd->pdata;
if (bd->in_use)
s5p_gpio_set_pd_cfg(pdata->nrst, S5P_GPIO_PD_OUTPUT1);
else
s5p_gpio_set_pd_cfg(pdata->nrst, S5P_GPIO_PD_OUTPUT0);
return 0;
}
static int gsd4t_resume(struct platform_device *dev)
{
return 0;
}
#else
#define gsd4t_suspend NULL
#define gsd4t_resume NULL
#endif
static struct platform_driver gsd4t_driver = {
.probe = gsd4t_probe,
.remove = __devexit_p(gsd4t_remove),
.suspend = gsd4t_suspend,
.resume = gsd4t_resume,
.driver = {
.name = "gsd4t",
},
};
static int __init gsd4t_init(void)
{
return platform_driver_register(&gsd4t_driver);
}
static void __exit gsd4t_exit(void)
{
platform_driver_unregister(&gsd4t_driver);
}
module_init(gsd4t_init);
module_exit(gsd4t_exit);
MODULE_AUTHOR("Minho Ban <mhban@samsung.com>");
MODULE_DESCRIPTION("GSD4T GPS driver");
MODULE_LICENSE("GPL");
|
