Commit | Line | Data |
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16216333 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
7176ba23 RK |
2 | /* |
3 | * Copyright (c) 2011, NVIDIA Corporation. | |
7176ba23 RK |
4 | */ |
5 | ||
7176ba23 RK |
6 | #include <linux/init.h> |
7 | #include <linux/kernel.h> | |
8 | #include <linux/module.h> | |
f623f75a | 9 | #include <linux/mod_devicetable.h> |
7176ba23 | 10 | #include <linux/rfkill.h> |
75c7124e | 11 | #include <linux/of.h> |
7176ba23 RK |
12 | #include <linux/platform_device.h> |
13 | #include <linux/clk.h> | |
14 | #include <linux/slab.h> | |
ef91ffaa | 15 | #include <linux/acpi.h> |
2111cad6 | 16 | #include <linux/gpio/consumer.h> |
7176ba23 | 17 | |
7176ba23 | 18 | struct rfkill_gpio_data { |
262c91ee HK |
19 | const char *name; |
20 | enum rfkill_type type; | |
2111cad6 HK |
21 | struct gpio_desc *reset_gpio; |
22 | struct gpio_desc *shutdown_gpio; | |
262c91ee HK |
23 | |
24 | struct rfkill *rfkill_dev; | |
262c91ee HK |
25 | struct clk *clk; |
26 | ||
27 | bool clk_enabled; | |
7176ba23 RK |
28 | }; |
29 | ||
30 | static int rfkill_gpio_set_power(void *data, bool blocked) | |
31 | { | |
32 | struct rfkill_gpio_data *rfkill = data; | |
33 | ||
771bb3dd LP |
34 | if (!blocked && !IS_ERR(rfkill->clk) && !rfkill->clk_enabled) |
35 | clk_enable(rfkill->clk); | |
36 | ||
37 | gpiod_set_value_cansleep(rfkill->shutdown_gpio, !blocked); | |
38 | gpiod_set_value_cansleep(rfkill->reset_gpio, !blocked); | |
39 | ||
40 | if (blocked && !IS_ERR(rfkill->clk) && rfkill->clk_enabled) | |
41 | clk_disable(rfkill->clk); | |
7176ba23 | 42 | |
fa5c107c | 43 | rfkill->clk_enabled = !blocked; |
7176ba23 RK |
44 | |
45 | return 0; | |
46 | } | |
47 | ||
48 | static const struct rfkill_ops rfkill_gpio_ops = { | |
49 | .set_block = rfkill_gpio_set_power, | |
50 | }; | |
51 | ||
72daceb9 MW |
52 | static const struct acpi_gpio_params reset_gpios = { 0, 0, false }; |
53 | static const struct acpi_gpio_params shutdown_gpios = { 1, 0, false }; | |
54 | ||
55 | static const struct acpi_gpio_mapping acpi_rfkill_default_gpios[] = { | |
56 | { "reset-gpios", &reset_gpios, 1 }, | |
57 | { "shutdown-gpios", &shutdown_gpios, 1 }, | |
58 | { }, | |
59 | }; | |
60 | ||
ef91ffaa HK |
61 | static int rfkill_gpio_acpi_probe(struct device *dev, |
62 | struct rfkill_gpio_data *rfkill) | |
63 | { | |
64 | const struct acpi_device_id *id; | |
65 | ||
66 | id = acpi_match_device(dev->driver->acpi_match_table, dev); | |
67 | if (!id) | |
68 | return -ENODEV; | |
69 | ||
ef91ffaa | 70 | rfkill->type = (unsigned)id->driver_data; |
ef91ffaa | 71 | |
4524667b | 72 | return devm_acpi_dev_add_driver_gpios(dev, acpi_rfkill_default_gpios); |
ef91ffaa HK |
73 | } |
74 | ||
7176ba23 RK |
75 | static int rfkill_gpio_probe(struct platform_device *pdev) |
76 | { | |
262c91ee | 77 | struct rfkill_gpio_data *rfkill; |
2111cad6 | 78 | struct gpio_desc *gpio; |
d64c732d PZ |
79 | const char *name_property; |
80 | const char *type_property; | |
7d5e9737 | 81 | const char *type_name; |
2111cad6 | 82 | int ret; |
7176ba23 | 83 | |
262c91ee HK |
84 | rfkill = devm_kzalloc(&pdev->dev, sizeof(*rfkill), GFP_KERNEL); |
85 | if (!rfkill) | |
86 | return -ENOMEM; | |
87 | ||
d64c732d PZ |
88 | if (dev_of_node(&pdev->dev)) { |
89 | name_property = "label"; | |
90 | type_property = "radio-type"; | |
91 | } else { | |
92 | name_property = "name"; | |
93 | type_property = "type"; | |
94 | } | |
95 | device_property_read_string(&pdev->dev, name_property, &rfkill->name); | |
96 | device_property_read_string(&pdev->dev, type_property, &type_name); | |
7d5e9737 HK |
97 | |
98 | if (!rfkill->name) | |
99 | rfkill->name = dev_name(&pdev->dev); | |
100 | ||
101 | rfkill->type = rfkill_find_type(type_name); | |
102 | ||
ef91ffaa HK |
103 | if (ACPI_HANDLE(&pdev->dev)) { |
104 | ret = rfkill_gpio_acpi_probe(&pdev->dev, rfkill); | |
105 | if (ret) | |
106 | return ret; | |
7176ba23 RK |
107 | } |
108 | ||
848ef586 | 109 | rfkill->clk = devm_clk_get(&pdev->dev, NULL); |
7176ba23 | 110 | |
b2f750c3 | 111 | gpio = devm_gpiod_get_optional(&pdev->dev, "reset", GPIOD_ASIS); |
f7959e9c UKK |
112 | if (IS_ERR(gpio)) |
113 | return PTR_ERR(gpio); | |
2111cad6 | 114 | |
f7959e9c UKK |
115 | rfkill->reset_gpio = gpio; |
116 | ||
b2f750c3 | 117 | gpio = devm_gpiod_get_optional(&pdev->dev, "shutdown", GPIOD_ASIS); |
f7959e9c UKK |
118 | if (IS_ERR(gpio)) |
119 | return PTR_ERR(gpio); | |
120 | ||
121 | rfkill->shutdown_gpio = gpio; | |
7176ba23 | 122 | |
7d5e9737 HK |
123 | /* Make sure at-least one GPIO is defined for this instance */ |
124 | if (!rfkill->reset_gpio && !rfkill->shutdown_gpio) { | |
2111cad6 HK |
125 | dev_err(&pdev->dev, "invalid platform data\n"); |
126 | return -EINVAL; | |
127 | } | |
128 | ||
262c91ee HK |
129 | rfkill->rfkill_dev = rfkill_alloc(rfkill->name, &pdev->dev, |
130 | rfkill->type, &rfkill_gpio_ops, | |
131 | rfkill); | |
5e7ca393 HK |
132 | if (!rfkill->rfkill_dev) |
133 | return -ENOMEM; | |
7176ba23 RK |
134 | |
135 | ret = rfkill_register(rfkill->rfkill_dev); | |
136 | if (ret < 0) | |
4bf01ca2 | 137 | goto err_destroy; |
7176ba23 RK |
138 | |
139 | platform_set_drvdata(pdev, rfkill); | |
140 | ||
262c91ee | 141 | dev_info(&pdev->dev, "%s device registered.\n", rfkill->name); |
7176ba23 RK |
142 | |
143 | return 0; | |
4bf01ca2 JH |
144 | |
145 | err_destroy: | |
146 | rfkill_destroy(rfkill->rfkill_dev); | |
147 | ||
148 | return ret; | |
7176ba23 RK |
149 | } |
150 | ||
151 | static int rfkill_gpio_remove(struct platform_device *pdev) | |
152 | { | |
153 | struct rfkill_gpio_data *rfkill = platform_get_drvdata(pdev); | |
154 | ||
155 | rfkill_unregister(rfkill->rfkill_dev); | |
156 | rfkill_destroy(rfkill->rfkill_dev); | |
7176ba23 RK |
157 | |
158 | return 0; | |
159 | } | |
160 | ||
41d09df1 | 161 | #ifdef CONFIG_ACPI |
ef91ffaa HK |
162 | static const struct acpi_device_id rfkill_acpi_match[] = { |
163 | { "BCM4752", RFKILL_TYPE_GPS }, | |
04f1b47c | 164 | { "LNV4752", RFKILL_TYPE_GPS }, |
ef91ffaa HK |
165 | { }, |
166 | }; | |
dda3b191 | 167 | MODULE_DEVICE_TABLE(acpi, rfkill_acpi_match); |
41d09df1 | 168 | #endif |
ef91ffaa | 169 | |
d64c732d PZ |
170 | static const struct of_device_id rfkill_of_match[] __maybe_unused = { |
171 | { .compatible = "rfkill-gpio", }, | |
172 | { }, | |
173 | }; | |
174 | MODULE_DEVICE_TABLE(of, rfkill_of_match); | |
175 | ||
7176ba23 RK |
176 | static struct platform_driver rfkill_gpio_driver = { |
177 | .probe = rfkill_gpio_probe, | |
9e2b29d0 | 178 | .remove = rfkill_gpio_remove, |
7176ba23 | 179 | .driver = { |
262c91ee | 180 | .name = "rfkill_gpio", |
ef91ffaa | 181 | .acpi_match_table = ACPI_PTR(rfkill_acpi_match), |
d64c732d | 182 | .of_match_table = of_match_ptr(rfkill_of_match), |
7176ba23 RK |
183 | }, |
184 | }; | |
185 | ||
98ef55f6 | 186 | module_platform_driver(rfkill_gpio_driver); |
7176ba23 RK |
187 | |
188 | MODULE_DESCRIPTION("gpio rfkill"); | |
189 | MODULE_AUTHOR("NVIDIA"); | |
190 | MODULE_LICENSE("GPL"); |