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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 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; | |
262c91ee HK |
39 | struct clk *clk; |
40 | ||
41 | bool clk_enabled; | |
7176ba23 RK |
42 | }; |
43 | ||
44 | static int rfkill_gpio_set_power(void *data, bool blocked) | |
45 | { | |
46 | struct rfkill_gpio_data *rfkill = data; | |
47 | ||
771bb3dd LP |
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); | |
7176ba23 | 56 | |
fa5c107c | 57 | rfkill->clk_enabled = !blocked; |
7176ba23 RK |
58 | |
59 | return 0; | |
60 | } | |
61 | ||
62 | static const struct rfkill_ops rfkill_gpio_ops = { | |
63 | .set_block = rfkill_gpio_set_power, | |
64 | }; | |
65 | ||
ef91ffaa HK |
66 | static int rfkill_gpio_acpi_probe(struct device *dev, |
67 | struct rfkill_gpio_data *rfkill) | |
68 | { | |
69 | const struct acpi_device_id *id; | |
70 | ||
71 | id = acpi_match_device(dev->driver->acpi_match_table, dev); | |
72 | if (!id) | |
73 | return -ENODEV; | |
74 | ||
75 | rfkill->name = dev_name(dev); | |
76 | rfkill->type = (unsigned)id->driver_data; | |
ef91ffaa HK |
77 | |
78 | return 0; | |
79 | } | |
80 | ||
7176ba23 RK |
81 | static int rfkill_gpio_probe(struct platform_device *pdev) |
82 | { | |
7176ba23 | 83 | struct rfkill_gpio_platform_data *pdata = pdev->dev.platform_data; |
262c91ee | 84 | struct rfkill_gpio_data *rfkill; |
2111cad6 HK |
85 | struct gpio_desc *gpio; |
86 | int ret; | |
7176ba23 | 87 | |
262c91ee HK |
88 | rfkill = devm_kzalloc(&pdev->dev, sizeof(*rfkill), GFP_KERNEL); |
89 | if (!rfkill) | |
90 | return -ENOMEM; | |
91 | ||
ef91ffaa HK |
92 | if (ACPI_HANDLE(&pdev->dev)) { |
93 | ret = rfkill_gpio_acpi_probe(&pdev->dev, rfkill); | |
94 | if (ret) | |
95 | return ret; | |
96 | } else if (pdata) { | |
262c91ee HK |
97 | rfkill->name = pdata->name; |
98 | rfkill->type = pdata->type; | |
262c91ee HK |
99 | } else { |
100 | return -ENODEV; | |
7176ba23 RK |
101 | } |
102 | ||
848ef586 | 103 | rfkill->clk = devm_clk_get(&pdev->dev, NULL); |
7176ba23 | 104 | |
781d4e0f | 105 | gpio = devm_gpiod_get_index(&pdev->dev, "reset", 0); |
2111cad6 HK |
106 | if (!IS_ERR(gpio)) { |
107 | ret = gpiod_direction_output(gpio, 0); | |
108 | if (ret) | |
5e7ca393 | 109 | return ret; |
2111cad6 HK |
110 | rfkill->reset_gpio = gpio; |
111 | } | |
112 | ||
781d4e0f | 113 | gpio = devm_gpiod_get_index(&pdev->dev, "shutdown", 1); |
2111cad6 HK |
114 | if (!IS_ERR(gpio)) { |
115 | ret = gpiod_direction_output(gpio, 0); | |
116 | if (ret) | |
117 | return ret; | |
118 | rfkill->shutdown_gpio = gpio; | |
7176ba23 RK |
119 | } |
120 | ||
2111cad6 HK |
121 | /* Make sure at-least one of the GPIO is defined and that |
122 | * a name is specified for this instance | |
123 | */ | |
124 | if ((!rfkill->reset_gpio && !rfkill->shutdown_gpio) || !rfkill->name) { | |
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) | |
5e7ca393 | 137 | return ret; |
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; | |
7176ba23 RK |
144 | } |
145 | ||
146 | static int rfkill_gpio_remove(struct platform_device *pdev) | |
147 | { | |
148 | struct rfkill_gpio_data *rfkill = platform_get_drvdata(pdev); | |
149 | ||
150 | rfkill_unregister(rfkill->rfkill_dev); | |
151 | rfkill_destroy(rfkill->rfkill_dev); | |
7176ba23 RK |
152 | |
153 | return 0; | |
154 | } | |
155 | ||
41d09df1 | 156 | #ifdef CONFIG_ACPI |
ef91ffaa | 157 | static const struct acpi_device_id rfkill_acpi_match[] = { |
41d09df1 HK |
158 | { "BCM2E1A", RFKILL_TYPE_BLUETOOTH }, |
159 | { "BCM2E39", RFKILL_TYPE_BLUETOOTH }, | |
160 | { "BCM2E3D", RFKILL_TYPE_BLUETOOTH }, | |
fb70118c | 161 | { "BCM2E64", RFKILL_TYPE_BLUETOOTH }, |
ef91ffaa | 162 | { "BCM4752", RFKILL_TYPE_GPS }, |
04f1b47c | 163 | { "LNV4752", RFKILL_TYPE_GPS }, |
ef91ffaa HK |
164 | { }, |
165 | }; | |
dda3b191 | 166 | MODULE_DEVICE_TABLE(acpi, rfkill_acpi_match); |
41d09df1 | 167 | #endif |
ef91ffaa | 168 | |
7176ba23 RK |
169 | static struct platform_driver rfkill_gpio_driver = { |
170 | .probe = rfkill_gpio_probe, | |
9e2b29d0 | 171 | .remove = rfkill_gpio_remove, |
7176ba23 | 172 | .driver = { |
262c91ee HK |
173 | .name = "rfkill_gpio", |
174 | .owner = THIS_MODULE, | |
ef91ffaa | 175 | .acpi_match_table = ACPI_PTR(rfkill_acpi_match), |
7176ba23 RK |
176 | }, |
177 | }; | |
178 | ||
98ef55f6 | 179 | module_platform_driver(rfkill_gpio_driver); |
7176ba23 RK |
180 | |
181 | MODULE_DESCRIPTION("gpio rfkill"); | |
182 | MODULE_AUTHOR("NVIDIA"); | |
183 | MODULE_LICENSE("GPL"); |