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1ad69f10 JH |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
3 | * u-blox GNSS receiver driver | |
4 | * | |
5 | * Copyright (C) 2018 Johan Hovold <johan@kernel.org> | |
6 | */ | |
7 | ||
8 | #include <linux/errno.h> | |
9 | #include <linux/gnss.h> | |
10 | #include <linux/init.h> | |
11 | #include <linux/kernel.h> | |
12 | #include <linux/module.h> | |
13 | #include <linux/of.h> | |
14 | #include <linux/regulator/consumer.h> | |
15 | #include <linux/serdev.h> | |
16 | ||
17 | #include "serial.h" | |
18 | ||
19 | struct ubx_data { | |
20 | struct regulator *v_bckp; | |
21 | struct regulator *vcc; | |
22 | }; | |
23 | ||
24 | static int ubx_set_active(struct gnss_serial *gserial) | |
25 | { | |
26 | struct ubx_data *data = gnss_serial_get_drvdata(gserial); | |
27 | int ret; | |
28 | ||
29 | ret = regulator_enable(data->vcc); | |
30 | if (ret) | |
31 | return ret; | |
32 | ||
33 | return 0; | |
34 | } | |
35 | ||
36 | static int ubx_set_standby(struct gnss_serial *gserial) | |
37 | { | |
38 | struct ubx_data *data = gnss_serial_get_drvdata(gserial); | |
39 | int ret; | |
40 | ||
41 | ret = regulator_disable(data->vcc); | |
42 | if (ret) | |
43 | return ret; | |
44 | ||
45 | return 0; | |
46 | } | |
47 | ||
48 | static int ubx_set_power(struct gnss_serial *gserial, | |
49 | enum gnss_serial_pm_state state) | |
50 | { | |
51 | switch (state) { | |
52 | case GNSS_SERIAL_ACTIVE: | |
53 | return ubx_set_active(gserial); | |
54 | case GNSS_SERIAL_OFF: | |
55 | case GNSS_SERIAL_STANDBY: | |
56 | return ubx_set_standby(gserial); | |
57 | } | |
58 | ||
59 | return -EINVAL; | |
60 | } | |
61 | ||
55570f1a | 62 | static const struct gnss_serial_ops ubx_gserial_ops = { |
1ad69f10 JH |
63 | .set_power = ubx_set_power, |
64 | }; | |
65 | ||
66 | static int ubx_probe(struct serdev_device *serdev) | |
67 | { | |
68 | struct gnss_serial *gserial; | |
69 | struct ubx_data *data; | |
70 | int ret; | |
71 | ||
72 | gserial = gnss_serial_allocate(serdev, sizeof(*data)); | |
73 | if (IS_ERR(gserial)) { | |
74 | ret = PTR_ERR(gserial); | |
75 | return ret; | |
76 | } | |
77 | ||
78 | gserial->ops = &ubx_gserial_ops; | |
79 | ||
10f14663 JH |
80 | gserial->gdev->type = GNSS_TYPE_UBX; |
81 | ||
1ad69f10 JH |
82 | data = gnss_serial_get_drvdata(gserial); |
83 | ||
84 | data->vcc = devm_regulator_get(&serdev->dev, "vcc"); | |
85 | if (IS_ERR(data->vcc)) { | |
86 | ret = PTR_ERR(data->vcc); | |
87 | goto err_free_gserial; | |
88 | } | |
89 | ||
90 | data->v_bckp = devm_regulator_get_optional(&serdev->dev, "v-bckp"); | |
91 | if (IS_ERR(data->v_bckp)) { | |
92 | ret = PTR_ERR(data->v_bckp); | |
93 | if (ret == -ENODEV) | |
94 | data->v_bckp = NULL; | |
95 | else | |
96 | goto err_free_gserial; | |
97 | } | |
98 | ||
99 | if (data->v_bckp) { | |
100 | ret = regulator_enable(data->v_bckp); | |
101 | if (ret) | |
102 | goto err_free_gserial; | |
103 | } | |
104 | ||
105 | ret = gnss_serial_register(gserial); | |
106 | if (ret) | |
107 | goto err_disable_v_bckp; | |
108 | ||
109 | return 0; | |
110 | ||
111 | err_disable_v_bckp: | |
112 | if (data->v_bckp) | |
113 | regulator_disable(data->v_bckp); | |
114 | err_free_gserial: | |
115 | gnss_serial_free(gserial); | |
116 | ||
117 | return ret; | |
118 | } | |
119 | ||
120 | static void ubx_remove(struct serdev_device *serdev) | |
121 | { | |
122 | struct gnss_serial *gserial = serdev_device_get_drvdata(serdev); | |
123 | struct ubx_data *data = gnss_serial_get_drvdata(gserial); | |
124 | ||
125 | gnss_serial_deregister(gserial); | |
126 | if (data->v_bckp) | |
127 | regulator_disable(data->v_bckp); | |
128 | gnss_serial_free(gserial); | |
b15c9015 | 129 | } |
1ad69f10 JH |
130 | |
131 | #ifdef CONFIG_OF | |
132 | static const struct of_device_id ubx_of_match[] = { | |
7cc10c5c | 133 | { .compatible = "u-blox,neo-6m" }, |
1ad69f10 JH |
134 | { .compatible = "u-blox,neo-8" }, |
135 | { .compatible = "u-blox,neo-m8" }, | |
136 | {}, | |
137 | }; | |
138 | MODULE_DEVICE_TABLE(of, ubx_of_match); | |
139 | #endif | |
140 | ||
141 | static struct serdev_device_driver ubx_driver = { | |
142 | .driver = { | |
143 | .name = "gnss-ubx", | |
144 | .of_match_table = of_match_ptr(ubx_of_match), | |
145 | .pm = &gnss_serial_pm_ops, | |
146 | }, | |
147 | .probe = ubx_probe, | |
148 | .remove = ubx_remove, | |
149 | }; | |
150 | module_serdev_device_driver(ubx_driver); | |
151 | ||
152 | MODULE_AUTHOR("Johan Hovold <johan@kernel.org>"); | |
153 | MODULE_DESCRIPTION("u-blox GNSS receiver driver"); | |
154 | MODULE_LICENSE("GPL v2"); |