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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> | |
ef91ffaa | 27 | #include <linux/acpi.h> |
2111cad6 | 28 | #include <linux/gpio/consumer.h> |
7176ba23 | 29 | |
7176ba23 | 30 | struct rfkill_gpio_data { |
262c91ee HK |
31 | const char *name; |
32 | enum rfkill_type type; | |
2111cad6 HK |
33 | struct gpio_desc *reset_gpio; |
34 | struct gpio_desc *shutdown_gpio; | |
262c91ee HK |
35 | |
36 | struct rfkill *rfkill_dev; | |
262c91ee HK |
37 | struct clk *clk; |
38 | ||
39 | bool clk_enabled; | |
7176ba23 RK |
40 | }; |
41 | ||
42 | static int rfkill_gpio_set_power(void *data, bool blocked) | |
43 | { | |
44 | struct rfkill_gpio_data *rfkill = data; | |
45 | ||
771bb3dd LP |
46 | if (!blocked && !IS_ERR(rfkill->clk) && !rfkill->clk_enabled) |
47 | clk_enable(rfkill->clk); | |
48 | ||
49 | gpiod_set_value_cansleep(rfkill->shutdown_gpio, !blocked); | |
50 | gpiod_set_value_cansleep(rfkill->reset_gpio, !blocked); | |
51 | ||
52 | if (blocked && !IS_ERR(rfkill->clk) && rfkill->clk_enabled) | |
53 | clk_disable(rfkill->clk); | |
7176ba23 | 54 | |
fa5c107c | 55 | rfkill->clk_enabled = !blocked; |
7176ba23 RK |
56 | |
57 | return 0; | |
58 | } | |
59 | ||
60 | static const struct rfkill_ops rfkill_gpio_ops = { | |
61 | .set_block = rfkill_gpio_set_power, | |
62 | }; | |
63 | ||
72daceb9 MW |
64 | static const struct acpi_gpio_params reset_gpios = { 0, 0, false }; |
65 | static const struct acpi_gpio_params shutdown_gpios = { 1, 0, false }; | |
66 | ||
67 | static const struct acpi_gpio_mapping acpi_rfkill_default_gpios[] = { | |
68 | { "reset-gpios", &reset_gpios, 1 }, | |
69 | { "shutdown-gpios", &shutdown_gpios, 1 }, | |
70 | { }, | |
71 | }; | |
72 | ||
ef91ffaa HK |
73 | static int rfkill_gpio_acpi_probe(struct device *dev, |
74 | struct rfkill_gpio_data *rfkill) | |
75 | { | |
76 | const struct acpi_device_id *id; | |
77 | ||
78 | id = acpi_match_device(dev->driver->acpi_match_table, dev); | |
79 | if (!id) | |
80 | return -ENODEV; | |
81 | ||
ef91ffaa | 82 | rfkill->type = (unsigned)id->driver_data; |
ef91ffaa | 83 | |
4524667b | 84 | return devm_acpi_dev_add_driver_gpios(dev, acpi_rfkill_default_gpios); |
ef91ffaa HK |
85 | } |
86 | ||
7176ba23 RK |
87 | static int rfkill_gpio_probe(struct platform_device *pdev) |
88 | { | |
262c91ee | 89 | struct rfkill_gpio_data *rfkill; |
2111cad6 | 90 | struct gpio_desc *gpio; |
7d5e9737 | 91 | const char *type_name; |
2111cad6 | 92 | int ret; |
7176ba23 | 93 | |
262c91ee HK |
94 | rfkill = devm_kzalloc(&pdev->dev, sizeof(*rfkill), GFP_KERNEL); |
95 | if (!rfkill) | |
96 | return -ENOMEM; | |
97 | ||
7d5e9737 HK |
98 | device_property_read_string(&pdev->dev, "name", &rfkill->name); |
99 | device_property_read_string(&pdev->dev, "type", &type_name); | |
100 | ||
101 | if (!rfkill->name) | |
102 | rfkill->name = dev_name(&pdev->dev); | |
103 | ||
104 | rfkill->type = rfkill_find_type(type_name); | |
105 | ||
ef91ffaa HK |
106 | if (ACPI_HANDLE(&pdev->dev)) { |
107 | ret = rfkill_gpio_acpi_probe(&pdev->dev, rfkill); | |
108 | if (ret) | |
109 | return ret; | |
7176ba23 RK |
110 | } |
111 | ||
848ef586 | 112 | rfkill->clk = devm_clk_get(&pdev->dev, NULL); |
7176ba23 | 113 | |
f7959e9c UKK |
114 | gpio = devm_gpiod_get_optional(&pdev->dev, "reset", GPIOD_OUT_LOW); |
115 | if (IS_ERR(gpio)) | |
116 | return PTR_ERR(gpio); | |
2111cad6 | 117 | |
f7959e9c UKK |
118 | rfkill->reset_gpio = gpio; |
119 | ||
120 | gpio = devm_gpiod_get_optional(&pdev->dev, "shutdown", GPIOD_OUT_LOW); | |
121 | if (IS_ERR(gpio)) | |
122 | return PTR_ERR(gpio); | |
123 | ||
124 | rfkill->shutdown_gpio = gpio; | |
7176ba23 | 125 | |
7d5e9737 HK |
126 | /* Make sure at-least one GPIO is defined for this instance */ |
127 | if (!rfkill->reset_gpio && !rfkill->shutdown_gpio) { | |
2111cad6 HK |
128 | dev_err(&pdev->dev, "invalid platform data\n"); |
129 | return -EINVAL; | |
130 | } | |
131 | ||
262c91ee HK |
132 | rfkill->rfkill_dev = rfkill_alloc(rfkill->name, &pdev->dev, |
133 | rfkill->type, &rfkill_gpio_ops, | |
134 | rfkill); | |
5e7ca393 HK |
135 | if (!rfkill->rfkill_dev) |
136 | return -ENOMEM; | |
7176ba23 RK |
137 | |
138 | ret = rfkill_register(rfkill->rfkill_dev); | |
139 | if (ret < 0) | |
5e7ca393 | 140 | return ret; |
7176ba23 RK |
141 | |
142 | platform_set_drvdata(pdev, rfkill); | |
143 | ||
262c91ee | 144 | dev_info(&pdev->dev, "%s device registered.\n", rfkill->name); |
7176ba23 RK |
145 | |
146 | return 0; | |
7176ba23 RK |
147 | } |
148 | ||
149 | static int rfkill_gpio_remove(struct platform_device *pdev) | |
150 | { | |
151 | struct rfkill_gpio_data *rfkill = platform_get_drvdata(pdev); | |
152 | ||
153 | rfkill_unregister(rfkill->rfkill_dev); | |
154 | rfkill_destroy(rfkill->rfkill_dev); | |
7176ba23 RK |
155 | |
156 | return 0; | |
157 | } | |
158 | ||
41d09df1 | 159 | #ifdef CONFIG_ACPI |
ef91ffaa HK |
160 | static const struct acpi_device_id rfkill_acpi_match[] = { |
161 | { "BCM4752", RFKILL_TYPE_GPS }, | |
04f1b47c | 162 | { "LNV4752", RFKILL_TYPE_GPS }, |
ef91ffaa HK |
163 | { }, |
164 | }; | |
dda3b191 | 165 | MODULE_DEVICE_TABLE(acpi, rfkill_acpi_match); |
41d09df1 | 166 | #endif |
ef91ffaa | 167 | |
7176ba23 RK |
168 | static struct platform_driver rfkill_gpio_driver = { |
169 | .probe = rfkill_gpio_probe, | |
9e2b29d0 | 170 | .remove = rfkill_gpio_remove, |
7176ba23 | 171 | .driver = { |
262c91ee | 172 | .name = "rfkill_gpio", |
ef91ffaa | 173 | .acpi_match_table = ACPI_PTR(rfkill_acpi_match), |
7176ba23 RK |
174 | }, |
175 | }; | |
176 | ||
98ef55f6 | 177 | module_platform_driver(rfkill_gpio_driver); |
7176ba23 RK |
178 | |
179 | MODULE_DESCRIPTION("gpio rfkill"); | |
180 | MODULE_AUTHOR("NVIDIA"); | |
181 | MODULE_LICENSE("GPL"); |