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Rhyland Klein7176ba22011-05-16 14:41:48 -07001/*
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>
Heikki Krogerusef91ffa2013-10-16 13:53:43 +030027#include <linux/acpi.h>
Heikki Krogerus2111cad2013-11-26 12:05:46 +020028#include <linux/gpio/consumer.h>
Rhyland Klein7176ba22011-05-16 14:41:48 -070029
Rhyland Klein7176ba22011-05-16 14:41:48 -070030struct rfkill_gpio_data {
Heikki Krogerus262c91e2013-10-16 13:53:42 +030031 const char *name;
32 enum rfkill_type type;
Heikki Krogerus2111cad2013-11-26 12:05:46 +020033 struct gpio_desc *reset_gpio;
34 struct gpio_desc *shutdown_gpio;
Heikki Krogerus262c91e2013-10-16 13:53:42 +030035
36 struct rfkill *rfkill_dev;
Heikki Krogerus262c91e2013-10-16 13:53:42 +030037 struct clk *clk;
38
39 bool clk_enabled;
Rhyland Klein7176ba22011-05-16 14:41:48 -070040};
41
42static int rfkill_gpio_set_power(void *data, bool blocked)
43{
44 struct rfkill_gpio_data *rfkill = data;
45
Loic Poulain771bb3d2014-05-07 11:38:11 +020046 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);
Rhyland Klein7176ba22011-05-16 14:41:48 -070054
Loic Poulainfa5c1072014-09-16 14:53:58 +020055 rfkill->clk_enabled = !blocked;
Rhyland Klein7176ba22011-05-16 14:41:48 -070056
57 return 0;
58}
59
60static const struct rfkill_ops rfkill_gpio_ops = {
61 .set_block = rfkill_gpio_set_power,
62};
63
Mika Westerberg72daceb2014-10-27 12:15:14 +020064static const struct acpi_gpio_params reset_gpios = { 0, 0, false };
65static const struct acpi_gpio_params shutdown_gpios = { 1, 0, false };
66
67static const struct acpi_gpio_mapping acpi_rfkill_default_gpios[] = {
68 { "reset-gpios", &reset_gpios, 1 },
69 { "shutdown-gpios", &shutdown_gpios, 1 },
70 { },
71};
72
Heikki Krogerusef91ffa2013-10-16 13:53:43 +030073static 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
Heikki Krogerusef91ffa2013-10-16 13:53:43 +030082 rfkill->type = (unsigned)id->driver_data;
Heikki Krogerusef91ffa2013-10-16 13:53:43 +030083
Mika Westerberg72daceb2014-10-27 12:15:14 +020084 return acpi_dev_add_driver_gpios(ACPI_COMPANION(dev),
85 acpi_rfkill_default_gpios);
Heikki Krogerusef91ffa2013-10-16 13:53:43 +030086}
87
Rhyland Klein7176ba22011-05-16 14:41:48 -070088static int rfkill_gpio_probe(struct platform_device *pdev)
89{
Heikki Krogerus262c91e2013-10-16 13:53:42 +030090 struct rfkill_gpio_data *rfkill;
Heikki Krogerus2111cad2013-11-26 12:05:46 +020091 struct gpio_desc *gpio;
Heikki Krogerus7d5e9732016-01-25 12:03:47 +030092 const char *type_name;
Heikki Krogerus2111cad2013-11-26 12:05:46 +020093 int ret;
Rhyland Klein7176ba22011-05-16 14:41:48 -070094
Heikki Krogerus5e7ca392013-10-16 13:53:39 +030095 rfkill = devm_kzalloc(&pdev->dev, sizeof(*rfkill), GFP_KERNEL);
Rhyland Klein7176ba22011-05-16 14:41:48 -070096 if (!rfkill)
97 return -ENOMEM;
98
Heikki Krogerus7d5e9732016-01-25 12:03:47 +030099 device_property_read_string(&pdev->dev, "name", &rfkill->name);
100 device_property_read_string(&pdev->dev, "type", &type_name);
101
102 if (!rfkill->name)
103 rfkill->name = dev_name(&pdev->dev);
104
105 rfkill->type = rfkill_find_type(type_name);
106
Heikki Krogerusef91ffa2013-10-16 13:53:43 +0300107 if (ACPI_HANDLE(&pdev->dev)) {
108 ret = rfkill_gpio_acpi_probe(&pdev->dev, rfkill);
109 if (ret)
110 return ret;
Heikki Krogerus262c91e2013-10-16 13:53:42 +0300111 }
112
Heikki Krogerus848ef582014-04-01 17:02:53 +0300113 rfkill->clk = devm_clk_get(&pdev->dev, NULL);
Rhyland Klein7176ba22011-05-16 14:41:48 -0700114
Uwe Kleine-Königf7959e92015-05-28 11:46:12 +0200115 gpio = devm_gpiod_get_optional(&pdev->dev, "reset", GPIOD_OUT_LOW);
116 if (IS_ERR(gpio))
117 return PTR_ERR(gpio);
Rhyland Klein7176ba22011-05-16 14:41:48 -0700118
Uwe Kleine-Königf7959e92015-05-28 11:46:12 +0200119 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;
Heikki Krogerus2111cad2013-11-26 12:05:46 +0200126
Heikki Krogerus7d5e9732016-01-25 12:03:47 +0300127 /* Make sure at-least one GPIO is defined for this instance */
128 if (!rfkill->reset_gpio && !rfkill->shutdown_gpio) {
Heikki Krogerus2111cad2013-11-26 12:05:46 +0200129 dev_err(&pdev->dev, "invalid platform data\n");
130 return -EINVAL;
131 }
132
Heikki Krogerus262c91e2013-10-16 13:53:42 +0300133 rfkill->rfkill_dev = rfkill_alloc(rfkill->name, &pdev->dev,
134 rfkill->type, &rfkill_gpio_ops,
135 rfkill);
Heikki Krogerus5e7ca392013-10-16 13:53:39 +0300136 if (!rfkill->rfkill_dev)
137 return -ENOMEM;
Rhyland Klein7176ba22011-05-16 14:41:48 -0700138
139 ret = rfkill_register(rfkill->rfkill_dev);
140 if (ret < 0)
Heikki Krogerus5e7ca392013-10-16 13:53:39 +0300141 return ret;
Rhyland Klein7176ba22011-05-16 14:41:48 -0700142
143 platform_set_drvdata(pdev, rfkill);
144
Heikki Krogerus262c91e2013-10-16 13:53:42 +0300145 dev_info(&pdev->dev, "%s device registered.\n", rfkill->name);
Rhyland Klein7176ba22011-05-16 14:41:48 -0700146
147 return 0;
Rhyland Klein7176ba22011-05-16 14:41:48 -0700148}
149
150static int rfkill_gpio_remove(struct platform_device *pdev)
151{
152 struct rfkill_gpio_data *rfkill = platform_get_drvdata(pdev);
153
Rhyland Klein7176ba22011-05-16 14:41:48 -0700154 rfkill_unregister(rfkill->rfkill_dev);
155 rfkill_destroy(rfkill->rfkill_dev);
Rhyland Klein7176ba22011-05-16 14:41:48 -0700156
Mika Westerberg72daceb2014-10-27 12:15:14 +0200157 acpi_dev_remove_driver_gpios(ACPI_COMPANION(&pdev->dev));
158
Rhyland Klein7176ba22011-05-16 14:41:48 -0700159 return 0;
160}
161
Heikki Krogerus41d09df2014-04-01 17:02:55 +0300162#ifdef CONFIG_ACPI
Heikki Krogerusef91ffa2013-10-16 13:53:43 +0300163static const struct acpi_device_id rfkill_acpi_match[] = {
164 { "BCM4752", RFKILL_TYPE_GPS },
Heikki Krogerus04f1b472014-04-01 17:02:54 +0300165 { "LNV4752", RFKILL_TYPE_GPS },
Heikki Krogerusef91ffa2013-10-16 13:53:43 +0300166 { },
167};
Marcel Holtmanndda3b192014-09-12 21:49:28 +0200168MODULE_DEVICE_TABLE(acpi, rfkill_acpi_match);
Heikki Krogerus41d09df2014-04-01 17:02:55 +0300169#endif
Heikki Krogerusef91ffa2013-10-16 13:53:43 +0300170
Rhyland Klein7176ba22011-05-16 14:41:48 -0700171static struct platform_driver rfkill_gpio_driver = {
172 .probe = rfkill_gpio_probe,
Bill Pemberton9e2b29d2012-12-03 09:56:26 -0500173 .remove = rfkill_gpio_remove,
Rhyland Klein7176ba22011-05-16 14:41:48 -0700174 .driver = {
Heikki Krogerus262c91e2013-10-16 13:53:42 +0300175 .name = "rfkill_gpio",
Heikki Krogerusef91ffa2013-10-16 13:53:43 +0300176 .acpi_match_table = ACPI_PTR(rfkill_acpi_match),
Rhyland Klein7176ba22011-05-16 14:41:48 -0700177 },
178};
179
Axel Lin98ef55f62011-11-28 17:15:04 +0800180module_platform_driver(rfkill_gpio_driver);
Rhyland Klein7176ba22011-05-16 14:41:48 -0700181
182MODULE_DESCRIPTION("gpio rfkill");
183MODULE_AUTHOR("NVIDIA");
184MODULE_LICENSE("GPL");