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7176ba23 RK |
1 | /* |
2 | * Copyright (c) 2011, NVIDIA Corporation. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License along | |
15 | * with this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. | |
17 | */ | |
18 | ||
19 | #include <linux/gpio.h> | |
20 | #include <linux/init.h> | |
21 | #include <linux/kernel.h> | |
22 | #include <linux/module.h> | |
23 | #include <linux/rfkill.h> | |
24 | #include <linux/platform_device.h> | |
25 | #include <linux/clk.h> | |
26 | #include <linux/slab.h> | |
27 | ||
28 | #include <linux/rfkill-gpio.h> | |
29 | ||
7176ba23 | 30 | struct rfkill_gpio_data { |
262c91ee HK |
31 | const char *name; |
32 | enum rfkill_type type; | |
33 | int reset_gpio; | |
34 | int shutdown_gpio; | |
35 | ||
36 | struct rfkill *rfkill_dev; | |
37 | char *reset_name; | |
38 | char *shutdown_name; | |
39 | struct clk *clk; | |
40 | ||
41 | bool clk_enabled; | |
7176ba23 RK |
42 | }; |
43 | ||
44 | static int rfkill_gpio_set_power(void *data, bool blocked) | |
45 | { | |
46 | struct rfkill_gpio_data *rfkill = data; | |
47 | ||
48 | if (blocked) { | |
262c91ee HK |
49 | if (gpio_is_valid(rfkill->shutdown_gpio)) |
50 | gpio_set_value(rfkill->shutdown_gpio, 0); | |
51 | if (gpio_is_valid(rfkill->reset_gpio)) | |
52 | gpio_set_value(rfkill->reset_gpio, 0); | |
f02ae59b HK |
53 | if (!IS_ERR(rfkill->clk) && rfkill->clk_enabled) |
54 | clk_disable(rfkill->clk); | |
7176ba23 | 55 | } else { |
f02ae59b HK |
56 | if (!IS_ERR(rfkill->clk) && !rfkill->clk_enabled) |
57 | clk_enable(rfkill->clk); | |
262c91ee HK |
58 | if (gpio_is_valid(rfkill->reset_gpio)) |
59 | gpio_set_value(rfkill->reset_gpio, 1); | |
60 | if (gpio_is_valid(rfkill->shutdown_gpio)) | |
61 | gpio_set_value(rfkill->shutdown_gpio, 1); | |
7176ba23 RK |
62 | } |
63 | ||
f02ae59b | 64 | rfkill->clk_enabled = blocked; |
7176ba23 RK |
65 | |
66 | return 0; | |
67 | } | |
68 | ||
69 | static const struct rfkill_ops rfkill_gpio_ops = { | |
70 | .set_block = rfkill_gpio_set_power, | |
71 | }; | |
72 | ||
73 | static int rfkill_gpio_probe(struct platform_device *pdev) | |
74 | { | |
7176ba23 | 75 | struct rfkill_gpio_platform_data *pdata = pdev->dev.platform_data; |
262c91ee HK |
76 | struct rfkill_gpio_data *rfkill; |
77 | const char *clk_name = NULL; | |
7176ba23 RK |
78 | int ret = 0; |
79 | int len = 0; | |
80 | ||
262c91ee HK |
81 | rfkill = devm_kzalloc(&pdev->dev, sizeof(*rfkill), GFP_KERNEL); |
82 | if (!rfkill) | |
83 | return -ENOMEM; | |
84 | ||
85 | if (pdata) { | |
86 | clk_name = pdata->power_clk_name; | |
87 | rfkill->name = pdata->name; | |
88 | rfkill->type = pdata->type; | |
89 | rfkill->reset_gpio = pdata->reset_gpio; | |
90 | rfkill->shutdown_gpio = pdata->shutdown_gpio; | |
91 | } else { | |
92 | return -ENODEV; | |
7176ba23 RK |
93 | } |
94 | ||
95 | /* make sure at-least one of the GPIO is defined and that | |
96 | * a name is specified for this instance */ | |
262c91ee HK |
97 | if ((!gpio_is_valid(rfkill->reset_gpio) && |
98 | !gpio_is_valid(rfkill->shutdown_gpio)) || !rfkill->name) { | |
7176ba23 RK |
99 | pr_warn("%s: invalid platform data\n", __func__); |
100 | return -EINVAL; | |
101 | } | |
102 | ||
262c91ee | 103 | if (pdata && pdata->gpio_runtime_setup) { |
e209c5a7 SL |
104 | ret = pdata->gpio_runtime_setup(pdev); |
105 | if (ret) { | |
106 | pr_warn("%s: can't set up gpio\n", __func__); | |
5e7ca393 | 107 | return ret; |
e209c5a7 SL |
108 | } |
109 | } | |
110 | ||
262c91ee | 111 | len = strlen(rfkill->name); |
5e7ca393 HK |
112 | rfkill->reset_name = devm_kzalloc(&pdev->dev, len + 7, GFP_KERNEL); |
113 | if (!rfkill->reset_name) | |
114 | return -ENOMEM; | |
7176ba23 | 115 | |
5e7ca393 HK |
116 | rfkill->shutdown_name = devm_kzalloc(&pdev->dev, len + 10, GFP_KERNEL); |
117 | if (!rfkill->shutdown_name) | |
118 | return -ENOMEM; | |
7176ba23 | 119 | |
262c91ee HK |
120 | snprintf(rfkill->reset_name, len + 6 , "%s_reset", rfkill->name); |
121 | snprintf(rfkill->shutdown_name, len + 9, "%s_shutdown", rfkill->name); | |
7176ba23 | 122 | |
262c91ee | 123 | rfkill->clk = devm_clk_get(&pdev->dev, clk_name); |
7176ba23 | 124 | |
262c91ee HK |
125 | if (gpio_is_valid(rfkill->reset_gpio)) { |
126 | ret = devm_gpio_request_one(&pdev->dev, rfkill->reset_gpio, | |
0be81727 | 127 | 0, rfkill->reset_name); |
7176ba23 RK |
128 | if (ret) { |
129 | pr_warn("%s: failed to get reset gpio.\n", __func__); | |
5e7ca393 | 130 | return ret; |
7176ba23 RK |
131 | } |
132 | } | |
133 | ||
262c91ee HK |
134 | if (gpio_is_valid(rfkill->shutdown_gpio)) { |
135 | ret = devm_gpio_request_one(&pdev->dev, rfkill->shutdown_gpio, | |
0be81727 | 136 | 0, rfkill->shutdown_name); |
7176ba23 RK |
137 | if (ret) { |
138 | pr_warn("%s: failed to get shutdown gpio.\n", __func__); | |
5e7ca393 | 139 | return ret; |
7176ba23 RK |
140 | } |
141 | } | |
142 | ||
262c91ee HK |
143 | rfkill->rfkill_dev = rfkill_alloc(rfkill->name, &pdev->dev, |
144 | rfkill->type, &rfkill_gpio_ops, | |
145 | rfkill); | |
5e7ca393 HK |
146 | if (!rfkill->rfkill_dev) |
147 | return -ENOMEM; | |
7176ba23 RK |
148 | |
149 | ret = rfkill_register(rfkill->rfkill_dev); | |
150 | if (ret < 0) | |
5e7ca393 | 151 | return ret; |
7176ba23 RK |
152 | |
153 | platform_set_drvdata(pdev, rfkill); | |
154 | ||
262c91ee | 155 | dev_info(&pdev->dev, "%s device registered.\n", rfkill->name); |
7176ba23 RK |
156 | |
157 | return 0; | |
7176ba23 RK |
158 | } |
159 | ||
160 | static int rfkill_gpio_remove(struct platform_device *pdev) | |
161 | { | |
162 | struct rfkill_gpio_data *rfkill = platform_get_drvdata(pdev); | |
e209c5a7 | 163 | struct rfkill_gpio_platform_data *pdata = pdev->dev.platform_data; |
7176ba23 | 164 | |
262c91ee | 165 | if (pdata && pdata->gpio_runtime_close) |
e209c5a7 | 166 | pdata->gpio_runtime_close(pdev); |
7176ba23 RK |
167 | rfkill_unregister(rfkill->rfkill_dev); |
168 | rfkill_destroy(rfkill->rfkill_dev); | |
7176ba23 RK |
169 | |
170 | return 0; | |
171 | } | |
172 | ||
173 | static struct platform_driver rfkill_gpio_driver = { | |
174 | .probe = rfkill_gpio_probe, | |
9e2b29d0 | 175 | .remove = rfkill_gpio_remove, |
7176ba23 | 176 | .driver = { |
262c91ee HK |
177 | .name = "rfkill_gpio", |
178 | .owner = THIS_MODULE, | |
7176ba23 RK |
179 | }, |
180 | }; | |
181 | ||
98ef55f6 | 182 | module_platform_driver(rfkill_gpio_driver); |
7176ba23 RK |
183 | |
184 | MODULE_DESCRIPTION("gpio rfkill"); | |
185 | MODULE_AUTHOR("NVIDIA"); | |
186 | MODULE_LICENSE("GPL"); |