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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 | #include <linux/acpi.h> | |
28 | #include <linux/gpio/consumer.h> | |
29 | ||
30 | #include <linux/rfkill-gpio.h> | |
31 | ||
32 | struct rfkill_gpio_data { | |
33 | const char *name; | |
34 | enum rfkill_type type; | |
35 | struct gpio_desc *reset_gpio; | |
36 | struct gpio_desc *shutdown_gpio; | |
37 | ||
38 | struct rfkill *rfkill_dev; | |
39 | struct clk *clk; | |
40 | ||
41 | bool clk_enabled; | |
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 && !IS_ERR(rfkill->clk) && !rfkill->clk_enabled) | |
49 | clk_enable(rfkill->clk); | |
50 | ||
51 | gpiod_set_value_cansleep(rfkill->shutdown_gpio, !blocked); | |
52 | gpiod_set_value_cansleep(rfkill->reset_gpio, !blocked); | |
53 | ||
54 | if (blocked && !IS_ERR(rfkill->clk) && rfkill->clk_enabled) | |
55 | clk_disable(rfkill->clk); | |
56 | ||
57 | rfkill->clk_enabled = !blocked; | |
58 | ||
59 | return 0; | |
60 | } | |
61 | ||
62 | static const struct rfkill_ops rfkill_gpio_ops = { | |
63 | .set_block = rfkill_gpio_set_power, | |
64 | }; | |
65 | ||
66 | static const struct acpi_gpio_params reset_gpios = { 0, 0, false }; | |
67 | static const struct acpi_gpio_params shutdown_gpios = { 1, 0, false }; | |
68 | ||
69 | static const struct acpi_gpio_mapping acpi_rfkill_default_gpios[] = { | |
70 | { "reset-gpios", &reset_gpios, 1 }, | |
71 | { "shutdown-gpios", &shutdown_gpios, 1 }, | |
72 | { }, | |
73 | }; | |
74 | ||
75 | static int rfkill_gpio_acpi_probe(struct device *dev, | |
76 | struct rfkill_gpio_data *rfkill) | |
77 | { | |
78 | const struct acpi_device_id *id; | |
79 | ||
80 | id = acpi_match_device(dev->driver->acpi_match_table, dev); | |
81 | if (!id) | |
82 | return -ENODEV; | |
83 | ||
84 | rfkill->name = dev_name(dev); | |
85 | rfkill->type = (unsigned)id->driver_data; | |
86 | ||
87 | return acpi_dev_add_driver_gpios(ACPI_COMPANION(dev), | |
88 | acpi_rfkill_default_gpios); | |
89 | } | |
90 | ||
91 | static int rfkill_gpio_probe(struct platform_device *pdev) | |
92 | { | |
93 | struct rfkill_gpio_platform_data *pdata = pdev->dev.platform_data; | |
94 | struct rfkill_gpio_data *rfkill; | |
95 | struct gpio_desc *gpio; | |
96 | int ret; | |
97 | ||
98 | rfkill = devm_kzalloc(&pdev->dev, sizeof(*rfkill), GFP_KERNEL); | |
99 | if (!rfkill) | |
100 | return -ENOMEM; | |
101 | ||
102 | if (ACPI_HANDLE(&pdev->dev)) { | |
103 | ret = rfkill_gpio_acpi_probe(&pdev->dev, rfkill); | |
104 | if (ret) | |
105 | return ret; | |
106 | } else if (pdata) { | |
107 | rfkill->name = pdata->name; | |
108 | rfkill->type = pdata->type; | |
109 | } else { | |
110 | return -ENODEV; | |
111 | } | |
112 | ||
113 | rfkill->clk = devm_clk_get(&pdev->dev, NULL); | |
114 | ||
115 | gpio = devm_gpiod_get_optional(&pdev->dev, "reset", GPIOD_OUT_LOW); | |
116 | if (IS_ERR(gpio)) | |
117 | return PTR_ERR(gpio); | |
118 | ||
119 | rfkill->reset_gpio = gpio; | |
120 | ||
121 | gpio = devm_gpiod_get_optional(&pdev->dev, "shutdown", GPIOD_OUT_LOW); | |
122 | if (IS_ERR(gpio)) | |
123 | return PTR_ERR(gpio); | |
124 | ||
125 | rfkill->shutdown_gpio = gpio; | |
126 | ||
127 | /* Make sure at-least one of the GPIO is defined and that | |
128 | * a name is specified for this instance | |
129 | */ | |
130 | if ((!rfkill->reset_gpio && !rfkill->shutdown_gpio) || !rfkill->name) { | |
131 | dev_err(&pdev->dev, "invalid platform data\n"); | |
132 | return -EINVAL; | |
133 | } | |
134 | ||
135 | rfkill->rfkill_dev = rfkill_alloc(rfkill->name, &pdev->dev, | |
136 | rfkill->type, &rfkill_gpio_ops, | |
137 | rfkill); | |
138 | if (!rfkill->rfkill_dev) | |
139 | return -ENOMEM; | |
140 | ||
141 | ret = rfkill_register(rfkill->rfkill_dev); | |
142 | if (ret < 0) | |
143 | return ret; | |
144 | ||
145 | platform_set_drvdata(pdev, rfkill); | |
146 | ||
147 | dev_info(&pdev->dev, "%s device registered.\n", rfkill->name); | |
148 | ||
149 | return 0; | |
150 | } | |
151 | ||
152 | static int rfkill_gpio_remove(struct platform_device *pdev) | |
153 | { | |
154 | struct rfkill_gpio_data *rfkill = platform_get_drvdata(pdev); | |
155 | ||
156 | rfkill_unregister(rfkill->rfkill_dev); | |
157 | rfkill_destroy(rfkill->rfkill_dev); | |
158 | ||
159 | acpi_dev_remove_driver_gpios(ACPI_COMPANION(&pdev->dev)); | |
160 | ||
161 | return 0; | |
162 | } | |
163 | ||
164 | #ifdef CONFIG_ACPI | |
165 | static const struct acpi_device_id rfkill_acpi_match[] = { | |
166 | { "BCM4752", RFKILL_TYPE_GPS }, | |
167 | { "LNV4752", RFKILL_TYPE_GPS }, | |
168 | { }, | |
169 | }; | |
170 | MODULE_DEVICE_TABLE(acpi, rfkill_acpi_match); | |
171 | #endif | |
172 | ||
173 | static struct platform_driver rfkill_gpio_driver = { | |
174 | .probe = rfkill_gpio_probe, | |
175 | .remove = rfkill_gpio_remove, | |
176 | .driver = { | |
177 | .name = "rfkill_gpio", | |
178 | .acpi_match_table = ACPI_PTR(rfkill_acpi_match), | |
179 | }, | |
180 | }; | |
181 | ||
182 | module_platform_driver(rfkill_gpio_driver); | |
183 | ||
184 | MODULE_DESCRIPTION("gpio rfkill"); | |
185 | MODULE_AUTHOR("NVIDIA"); | |
186 | MODULE_LICENSE("GPL"); |