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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 | ||
30 | enum rfkill_gpio_clk_state { | |
31 | UNSPECIFIED = 0, | |
32 | PWR_ENABLED, | |
33 | PWR_DISABLED | |
34 | }; | |
35 | ||
36 | #define PWR_CLK_SET(_RF, _EN) \ | |
37 | ((_RF)->pwr_clk_enabled = (!(_EN) ? PWR_ENABLED : PWR_DISABLED)) | |
38 | #define PWR_CLK_ENABLED(_RF) ((_RF)->pwr_clk_enabled == PWR_ENABLED) | |
39 | #define PWR_CLK_DISABLED(_RF) ((_RF)->pwr_clk_enabled != PWR_ENABLED) | |
40 | ||
41 | struct rfkill_gpio_data { | |
42 | struct rfkill_gpio_platform_data *pdata; | |
43 | struct rfkill *rfkill_dev; | |
44 | char *reset_name; | |
45 | char *shutdown_name; | |
46 | enum rfkill_gpio_clk_state pwr_clk_enabled; | |
47 | struct clk *pwr_clk; | |
48 | }; | |
49 | ||
50 | static int rfkill_gpio_set_power(void *data, bool blocked) | |
51 | { | |
52 | struct rfkill_gpio_data *rfkill = data; | |
53 | ||
54 | if (blocked) { | |
55 | if (gpio_is_valid(rfkill->pdata->shutdown_gpio)) | |
56 | gpio_direction_output(rfkill->pdata->shutdown_gpio, 0); | |
57 | if (gpio_is_valid(rfkill->pdata->reset_gpio)) | |
58 | gpio_direction_output(rfkill->pdata->reset_gpio, 0); | |
59 | if (rfkill->pwr_clk && PWR_CLK_ENABLED(rfkill)) | |
60 | clk_disable(rfkill->pwr_clk); | |
61 | } else { | |
62 | if (rfkill->pwr_clk && PWR_CLK_DISABLED(rfkill)) | |
63 | clk_enable(rfkill->pwr_clk); | |
64 | if (gpio_is_valid(rfkill->pdata->reset_gpio)) | |
65 | gpio_direction_output(rfkill->pdata->reset_gpio, 1); | |
66 | if (gpio_is_valid(rfkill->pdata->shutdown_gpio)) | |
67 | gpio_direction_output(rfkill->pdata->shutdown_gpio, 1); | |
68 | } | |
69 | ||
70 | if (rfkill->pwr_clk) | |
71 | PWR_CLK_SET(rfkill, blocked); | |
72 | ||
73 | return 0; | |
74 | } | |
75 | ||
76 | static const struct rfkill_ops rfkill_gpio_ops = { | |
77 | .set_block = rfkill_gpio_set_power, | |
78 | }; | |
79 | ||
80 | static int rfkill_gpio_probe(struct platform_device *pdev) | |
81 | { | |
82 | struct rfkill_gpio_data *rfkill; | |
83 | struct rfkill_gpio_platform_data *pdata = pdev->dev.platform_data; | |
84 | int ret = 0; | |
85 | int len = 0; | |
86 | ||
87 | if (!pdata) { | |
88 | pr_warn("%s: No platform data specified\n", __func__); | |
89 | return -EINVAL; | |
90 | } | |
91 | ||
92 | /* make sure at-least one of the GPIO is defined and that | |
93 | * a name is specified for this instance */ | |
94 | if (!pdata->name || (!gpio_is_valid(pdata->reset_gpio) && | |
95 | !gpio_is_valid(pdata->shutdown_gpio))) { | |
96 | pr_warn("%s: invalid platform data\n", __func__); | |
97 | return -EINVAL; | |
98 | } | |
99 | ||
100 | rfkill = kzalloc(sizeof(*rfkill), GFP_KERNEL); | |
101 | if (!rfkill) | |
102 | return -ENOMEM; | |
103 | ||
e209c5a7 SL |
104 | if (pdata->gpio_runtime_setup) { |
105 | ret = pdata->gpio_runtime_setup(pdev); | |
106 | if (ret) { | |
107 | pr_warn("%s: can't set up gpio\n", __func__); | |
841f1d92 | 108 | goto fail_alloc; |
e209c5a7 SL |
109 | } |
110 | } | |
111 | ||
7176ba23 RK |
112 | rfkill->pdata = pdata; |
113 | ||
114 | len = strlen(pdata->name); | |
115 | rfkill->reset_name = kzalloc(len + 7, GFP_KERNEL); | |
116 | if (!rfkill->reset_name) { | |
117 | ret = -ENOMEM; | |
118 | goto fail_alloc; | |
119 | } | |
120 | ||
121 | rfkill->shutdown_name = kzalloc(len + 10, GFP_KERNEL); | |
122 | if (!rfkill->shutdown_name) { | |
123 | ret = -ENOMEM; | |
124 | goto fail_reset_name; | |
125 | } | |
126 | ||
127 | snprintf(rfkill->reset_name, len + 6 , "%s_reset", pdata->name); | |
128 | snprintf(rfkill->shutdown_name, len + 9, "%s_shutdown", pdata->name); | |
129 | ||
130 | if (pdata->power_clk_name) { | |
131 | rfkill->pwr_clk = clk_get(&pdev->dev, pdata->power_clk_name); | |
132 | if (IS_ERR(rfkill->pwr_clk)) { | |
133 | pr_warn("%s: can't find pwr_clk.\n", __func__); | |
06f95e66 | 134 | ret = PTR_ERR(rfkill->pwr_clk); |
7176ba23 RK |
135 | goto fail_shutdown_name; |
136 | } | |
137 | } | |
138 | ||
139 | if (gpio_is_valid(pdata->reset_gpio)) { | |
140 | ret = gpio_request(pdata->reset_gpio, rfkill->reset_name); | |
141 | if (ret) { | |
142 | pr_warn("%s: failed to get reset gpio.\n", __func__); | |
143 | goto fail_clock; | |
144 | } | |
145 | } | |
146 | ||
147 | if (gpio_is_valid(pdata->shutdown_gpio)) { | |
148 | ret = gpio_request(pdata->shutdown_gpio, rfkill->shutdown_name); | |
149 | if (ret) { | |
150 | pr_warn("%s: failed to get shutdown gpio.\n", __func__); | |
151 | goto fail_reset; | |
152 | } | |
153 | } | |
154 | ||
155 | rfkill->rfkill_dev = rfkill_alloc(pdata->name, &pdev->dev, pdata->type, | |
06f95e66 WY |
156 | &rfkill_gpio_ops, rfkill); |
157 | if (!rfkill->rfkill_dev) { | |
158 | ret = -ENOMEM; | |
7176ba23 | 159 | goto fail_shutdown; |
06f95e66 | 160 | } |
7176ba23 RK |
161 | |
162 | ret = rfkill_register(rfkill->rfkill_dev); | |
163 | if (ret < 0) | |
164 | goto fail_rfkill; | |
165 | ||
166 | platform_set_drvdata(pdev, rfkill); | |
167 | ||
168 | dev_info(&pdev->dev, "%s device registered.\n", pdata->name); | |
169 | ||
170 | return 0; | |
171 | ||
172 | fail_rfkill: | |
173 | rfkill_destroy(rfkill->rfkill_dev); | |
174 | fail_shutdown: | |
175 | if (gpio_is_valid(pdata->shutdown_gpio)) | |
176 | gpio_free(pdata->shutdown_gpio); | |
177 | fail_reset: | |
178 | if (gpio_is_valid(pdata->reset_gpio)) | |
179 | gpio_free(pdata->reset_gpio); | |
180 | fail_clock: | |
181 | if (rfkill->pwr_clk) | |
182 | clk_put(rfkill->pwr_clk); | |
183 | fail_shutdown_name: | |
184 | kfree(rfkill->shutdown_name); | |
185 | fail_reset_name: | |
186 | kfree(rfkill->reset_name); | |
187 | fail_alloc: | |
188 | kfree(rfkill); | |
189 | ||
190 | return ret; | |
191 | } | |
192 | ||
193 | static int rfkill_gpio_remove(struct platform_device *pdev) | |
194 | { | |
195 | struct rfkill_gpio_data *rfkill = platform_get_drvdata(pdev); | |
e209c5a7 | 196 | struct rfkill_gpio_platform_data *pdata = pdev->dev.platform_data; |
7176ba23 | 197 | |
e209c5a7 SL |
198 | if (pdata->gpio_runtime_close) |
199 | pdata->gpio_runtime_close(pdev); | |
7176ba23 RK |
200 | rfkill_unregister(rfkill->rfkill_dev); |
201 | rfkill_destroy(rfkill->rfkill_dev); | |
202 | if (gpio_is_valid(rfkill->pdata->shutdown_gpio)) | |
203 | gpio_free(rfkill->pdata->shutdown_gpio); | |
204 | if (gpio_is_valid(rfkill->pdata->reset_gpio)) | |
205 | gpio_free(rfkill->pdata->reset_gpio); | |
206 | if (rfkill->pwr_clk && PWR_CLK_ENABLED(rfkill)) | |
207 | clk_disable(rfkill->pwr_clk); | |
208 | if (rfkill->pwr_clk) | |
209 | clk_put(rfkill->pwr_clk); | |
210 | kfree(rfkill->shutdown_name); | |
211 | kfree(rfkill->reset_name); | |
212 | kfree(rfkill); | |
213 | ||
214 | return 0; | |
215 | } | |
216 | ||
217 | static struct platform_driver rfkill_gpio_driver = { | |
218 | .probe = rfkill_gpio_probe, | |
9e2b29d0 | 219 | .remove = rfkill_gpio_remove, |
7176ba23 RK |
220 | .driver = { |
221 | .name = "rfkill_gpio", | |
222 | .owner = THIS_MODULE, | |
223 | }, | |
224 | }; | |
225 | ||
98ef55f6 | 226 | module_platform_driver(rfkill_gpio_driver); |
7176ba23 RK |
227 | |
228 | MODULE_DESCRIPTION("gpio rfkill"); | |
229 | MODULE_AUTHOR("NVIDIA"); | |
230 | MODULE_LICENSE("GPL"); |