Commit | Line | Data |
---|---|---|
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> | |
ef91ffaa | 27 | #include <linux/acpi.h> |
2111cad6 | 28 | #include <linux/gpio/consumer.h> |
7176ba23 RK |
29 | |
30 | #include <linux/rfkill-gpio.h> | |
31 | ||
7176ba23 | 32 | struct rfkill_gpio_data { |
262c91ee HK |
33 | const char *name; |
34 | enum rfkill_type type; | |
2111cad6 HK |
35 | struct gpio_desc *reset_gpio; |
36 | struct gpio_desc *shutdown_gpio; | |
262c91ee HK |
37 | |
38 | struct rfkill *rfkill_dev; | |
39 | char *reset_name; | |
40 | char *shutdown_name; | |
41 | struct clk *clk; | |
42 | ||
43 | bool clk_enabled; | |
7176ba23 RK |
44 | }; |
45 | ||
46 | static int rfkill_gpio_set_power(void *data, bool blocked) | |
47 | { | |
48 | struct rfkill_gpio_data *rfkill = data; | |
49 | ||
50 | if (blocked) { | |
2111cad6 HK |
51 | gpiod_set_value(rfkill->shutdown_gpio, 0); |
52 | gpiod_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); | |
2111cad6 HK |
58 | gpiod_set_value(rfkill->reset_gpio, 1); |
59 | gpiod_set_value(rfkill->shutdown_gpio, 1); | |
7176ba23 RK |
60 | } |
61 | ||
f02ae59b | 62 | rfkill->clk_enabled = blocked; |
7176ba23 RK |
63 | |
64 | return 0; | |
65 | } | |
66 | ||
67 | static const struct rfkill_ops rfkill_gpio_ops = { | |
68 | .set_block = rfkill_gpio_set_power, | |
69 | }; | |
70 | ||
ef91ffaa HK |
71 | static int rfkill_gpio_acpi_probe(struct device *dev, |
72 | struct rfkill_gpio_data *rfkill) | |
73 | { | |
74 | const struct acpi_device_id *id; | |
75 | ||
76 | id = acpi_match_device(dev->driver->acpi_match_table, dev); | |
77 | if (!id) | |
78 | return -ENODEV; | |
79 | ||
80 | rfkill->name = dev_name(dev); | |
81 | rfkill->type = (unsigned)id->driver_data; | |
ef91ffaa HK |
82 | |
83 | return 0; | |
84 | } | |
85 | ||
7176ba23 RK |
86 | static int rfkill_gpio_probe(struct platform_device *pdev) |
87 | { | |
7176ba23 | 88 | struct rfkill_gpio_platform_data *pdata = pdev->dev.platform_data; |
262c91ee HK |
89 | struct rfkill_gpio_data *rfkill; |
90 | const char *clk_name = NULL; | |
2111cad6 HK |
91 | struct gpio_desc *gpio; |
92 | int ret; | |
93 | int len; | |
7176ba23 | 94 | |
262c91ee HK |
95 | rfkill = devm_kzalloc(&pdev->dev, sizeof(*rfkill), GFP_KERNEL); |
96 | if (!rfkill) | |
97 | return -ENOMEM; | |
98 | ||
ef91ffaa HK |
99 | if (ACPI_HANDLE(&pdev->dev)) { |
100 | ret = rfkill_gpio_acpi_probe(&pdev->dev, rfkill); | |
101 | if (ret) | |
102 | return ret; | |
103 | } else if (pdata) { | |
262c91ee HK |
104 | clk_name = pdata->power_clk_name; |
105 | rfkill->name = pdata->name; | |
106 | rfkill->type = pdata->type; | |
262c91ee HK |
107 | } else { |
108 | return -ENODEV; | |
7176ba23 RK |
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 | |
2111cad6 HK |
125 | gpio = devm_gpiod_get_index(&pdev->dev, rfkill->reset_name, 0); |
126 | if (!IS_ERR(gpio)) { | |
127 | ret = gpiod_direction_output(gpio, 0); | |
128 | if (ret) | |
5e7ca393 | 129 | return ret; |
2111cad6 HK |
130 | rfkill->reset_gpio = gpio; |
131 | } | |
132 | ||
133 | gpio = devm_gpiod_get_index(&pdev->dev, rfkill->shutdown_name, 1); | |
134 | if (!IS_ERR(gpio)) { | |
135 | ret = gpiod_direction_output(gpio, 0); | |
136 | if (ret) | |
137 | return ret; | |
138 | rfkill->shutdown_gpio = gpio; | |
7176ba23 RK |
139 | } |
140 | ||
2111cad6 HK |
141 | /* Make sure at-least one of the GPIO is defined and that |
142 | * a name is specified for this instance | |
143 | */ | |
144 | if ((!rfkill->reset_gpio && !rfkill->shutdown_gpio) || !rfkill->name) { | |
145 | dev_err(&pdev->dev, "invalid platform data\n"); | |
146 | return -EINVAL; | |
147 | } | |
148 | ||
149 | if (pdata && pdata->gpio_runtime_setup) { | |
150 | ret = pdata->gpio_runtime_setup(pdev); | |
7176ba23 | 151 | if (ret) { |
2111cad6 | 152 | dev_err(&pdev->dev, "can't set up gpio\n"); |
5e7ca393 | 153 | return ret; |
7176ba23 RK |
154 | } |
155 | } | |
156 | ||
262c91ee HK |
157 | rfkill->rfkill_dev = rfkill_alloc(rfkill->name, &pdev->dev, |
158 | rfkill->type, &rfkill_gpio_ops, | |
159 | rfkill); | |
5e7ca393 HK |
160 | if (!rfkill->rfkill_dev) |
161 | return -ENOMEM; | |
7176ba23 RK |
162 | |
163 | ret = rfkill_register(rfkill->rfkill_dev); | |
164 | if (ret < 0) | |
5e7ca393 | 165 | return ret; |
7176ba23 RK |
166 | |
167 | platform_set_drvdata(pdev, rfkill); | |
168 | ||
262c91ee | 169 | dev_info(&pdev->dev, "%s device registered.\n", rfkill->name); |
7176ba23 RK |
170 | |
171 | return 0; | |
7176ba23 RK |
172 | } |
173 | ||
174 | static int rfkill_gpio_remove(struct platform_device *pdev) | |
175 | { | |
176 | struct rfkill_gpio_data *rfkill = platform_get_drvdata(pdev); | |
e209c5a7 | 177 | struct rfkill_gpio_platform_data *pdata = pdev->dev.platform_data; |
7176ba23 | 178 | |
262c91ee | 179 | if (pdata && pdata->gpio_runtime_close) |
e209c5a7 | 180 | pdata->gpio_runtime_close(pdev); |
7176ba23 RK |
181 | rfkill_unregister(rfkill->rfkill_dev); |
182 | rfkill_destroy(rfkill->rfkill_dev); | |
7176ba23 RK |
183 | |
184 | return 0; | |
185 | } | |
186 | ||
ef91ffaa HK |
187 | static const struct acpi_device_id rfkill_acpi_match[] = { |
188 | { "BCM4752", RFKILL_TYPE_GPS }, | |
189 | { }, | |
190 | }; | |
191 | ||
7176ba23 RK |
192 | static struct platform_driver rfkill_gpio_driver = { |
193 | .probe = rfkill_gpio_probe, | |
9e2b29d0 | 194 | .remove = rfkill_gpio_remove, |
7176ba23 | 195 | .driver = { |
262c91ee HK |
196 | .name = "rfkill_gpio", |
197 | .owner = THIS_MODULE, | |
ef91ffaa | 198 | .acpi_match_table = ACPI_PTR(rfkill_acpi_match), |
7176ba23 RK |
199 | }, |
200 | }; | |
201 | ||
98ef55f6 | 202 | module_platform_driver(rfkill_gpio_driver); |
7176ba23 RK |
203 | |
204 | MODULE_DESCRIPTION("gpio rfkill"); | |
205 | MODULE_AUTHOR("NVIDIA"); | |
206 | MODULE_LICENSE("GPL"); |