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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
30struct rfkill_gpio_data {
31 const char *name;
32 enum rfkill_type type;
33 struct gpio_desc *reset_gpio;
34 struct gpio_desc *shutdown_gpio;
35
36 struct rfkill *rfkill_dev;
37 struct clk *clk;
38
39 bool clk_enabled;
40};
41
42static int rfkill_gpio_set_power(void *data, bool blocked)
43{
44 struct rfkill_gpio_data *rfkill = data;
45
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);
54
55 rfkill->clk_enabled = !blocked;
56
57 return 0;
58}
59
60static const struct rfkill_ops rfkill_gpio_ops = {
61 .set_block = rfkill_gpio_set_power,
62};
63
64static 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
73static 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
82 rfkill->type = (unsigned)id->driver_data;
83
84 return acpi_dev_add_driver_gpios(ACPI_COMPANION(dev),
85 acpi_rfkill_default_gpios);
86}
87
88static int rfkill_gpio_probe(struct platform_device *pdev)
89{
90 struct rfkill_gpio_data *rfkill;
91 struct gpio_desc *gpio;
92 const char *type_name;
93 int ret;
94
95 rfkill = devm_kzalloc(&pdev->dev, sizeof(*rfkill), GFP_KERNEL);
96 if (!rfkill)
97 return -ENOMEM;
98
99 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
107 if (ACPI_HANDLE(&pdev->dev)) {
108 ret = rfkill_gpio_acpi_probe(&pdev->dev, rfkill);
109 if (ret)
110 return ret;
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 GPIO is defined for this instance */
128 if (!rfkill->reset_gpio && !rfkill->shutdown_gpio) {
129 dev_err(&pdev->dev, "invalid platform data\n");
130 return -EINVAL;
131 }
132
133 rfkill->rfkill_dev = rfkill_alloc(rfkill->name, &pdev->dev,
134 rfkill->type, &rfkill_gpio_ops,
135 rfkill);
136 if (!rfkill->rfkill_dev)
137 return -ENOMEM;
138
139 ret = rfkill_register(rfkill->rfkill_dev);
140 if (ret < 0)
141 return ret;
142
143 platform_set_drvdata(pdev, rfkill);
144
145 dev_info(&pdev->dev, "%s device registered.\n", rfkill->name);
146
147 return 0;
148}
149
150static int rfkill_gpio_remove(struct platform_device *pdev)
151{
152 struct rfkill_gpio_data *rfkill = platform_get_drvdata(pdev);
153
154 rfkill_unregister(rfkill->rfkill_dev);
155 rfkill_destroy(rfkill->rfkill_dev);
156
157 acpi_dev_remove_driver_gpios(ACPI_COMPANION(&pdev->dev));
158
159 return 0;
160}
161
162#ifdef CONFIG_ACPI
163static const struct acpi_device_id rfkill_acpi_match[] = {
164 { "BCM4752", RFKILL_TYPE_GPS },
165 { "LNV4752", RFKILL_TYPE_GPS },
166 { },
167};
168MODULE_DEVICE_TABLE(acpi, rfkill_acpi_match);
169#endif
170
171static struct platform_driver rfkill_gpio_driver = {
172 .probe = rfkill_gpio_probe,
173 .remove = rfkill_gpio_remove,
174 .driver = {
175 .name = "rfkill_gpio",
176 .acpi_match_table = ACPI_PTR(rfkill_acpi_match),
177 },
178};
179
180module_platform_driver(rfkill_gpio_driver);
181
182MODULE_DESCRIPTION("gpio rfkill");
183MODULE_AUTHOR("NVIDIA");
184MODULE_LICENSE("GPL");
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
32struct 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 char *reset_name;
40 char *shutdown_name;
41 struct clk *clk;
42
43 bool clk_enabled;
44};
45
46static int rfkill_gpio_set_power(void *data, bool blocked)
47{
48 struct rfkill_gpio_data *rfkill = data;
49
50 if (blocked) {
51 gpiod_set_value(rfkill->shutdown_gpio, 0);
52 gpiod_set_value(rfkill->reset_gpio, 0);
53 if (!IS_ERR(rfkill->clk) && rfkill->clk_enabled)
54 clk_disable(rfkill->clk);
55 } else {
56 if (!IS_ERR(rfkill->clk) && !rfkill->clk_enabled)
57 clk_enable(rfkill->clk);
58 gpiod_set_value(rfkill->reset_gpio, 1);
59 gpiod_set_value(rfkill->shutdown_gpio, 1);
60 }
61
62 rfkill->clk_enabled = blocked;
63
64 return 0;
65}
66
67static const struct rfkill_ops rfkill_gpio_ops = {
68 .set_block = rfkill_gpio_set_power,
69};
70
71static int rfkill_gpio_acpi_probe(struct device *dev,
72 struct rfkill_gpio_data *rfkill)
73{
74 const struct acpi_device_id *id;
75
76 id = acpi_match_device(dev->driver->acpi_match_table, dev);
77 if (!id)
78 return -ENODEV;
79
80 rfkill->name = dev_name(dev);
81 rfkill->type = (unsigned)id->driver_data;
82
83 return 0;
84}
85
86static int rfkill_gpio_probe(struct platform_device *pdev)
87{
88 struct rfkill_gpio_platform_data *pdata = pdev->dev.platform_data;
89 struct rfkill_gpio_data *rfkill;
90 const char *clk_name = NULL;
91 struct gpio_desc *gpio;
92 int ret;
93 int len;
94
95 rfkill = devm_kzalloc(&pdev->dev, sizeof(*rfkill), GFP_KERNEL);
96 if (!rfkill)
97 return -ENOMEM;
98
99 if (ACPI_HANDLE(&pdev->dev)) {
100 ret = rfkill_gpio_acpi_probe(&pdev->dev, rfkill);
101 if (ret)
102 return ret;
103 } else if (pdata) {
104 clk_name = pdata->power_clk_name;
105 rfkill->name = pdata->name;
106 rfkill->type = pdata->type;
107 } else {
108 return -ENODEV;
109 }
110
111 len = strlen(rfkill->name);
112 rfkill->reset_name = devm_kzalloc(&pdev->dev, len + 7, GFP_KERNEL);
113 if (!rfkill->reset_name)
114 return -ENOMEM;
115
116 rfkill->shutdown_name = devm_kzalloc(&pdev->dev, len + 10, GFP_KERNEL);
117 if (!rfkill->shutdown_name)
118 return -ENOMEM;
119
120 snprintf(rfkill->reset_name, len + 6 , "%s_reset", rfkill->name);
121 snprintf(rfkill->shutdown_name, len + 9, "%s_shutdown", rfkill->name);
122
123 rfkill->clk = devm_clk_get(&pdev->dev, clk_name);
124
125 gpio = devm_gpiod_get_index(&pdev->dev, rfkill->reset_name, 0);
126 if (!IS_ERR(gpio)) {
127 ret = gpiod_direction_output(gpio, 0);
128 if (ret)
129 return ret;
130 rfkill->reset_gpio = gpio;
131 }
132
133 gpio = devm_gpiod_get_index(&pdev->dev, rfkill->shutdown_name, 1);
134 if (!IS_ERR(gpio)) {
135 ret = gpiod_direction_output(gpio, 0);
136 if (ret)
137 return ret;
138 rfkill->shutdown_gpio = gpio;
139 }
140
141 /* Make sure at-least one of the GPIO is defined and that
142 * a name is specified for this instance
143 */
144 if ((!rfkill->reset_gpio && !rfkill->shutdown_gpio) || !rfkill->name) {
145 dev_err(&pdev->dev, "invalid platform data\n");
146 return -EINVAL;
147 }
148
149 if (pdata && pdata->gpio_runtime_setup) {
150 ret = pdata->gpio_runtime_setup(pdev);
151 if (ret) {
152 dev_err(&pdev->dev, "can't set up gpio\n");
153 return ret;
154 }
155 }
156
157 rfkill->rfkill_dev = rfkill_alloc(rfkill->name, &pdev->dev,
158 rfkill->type, &rfkill_gpio_ops,
159 rfkill);
160 if (!rfkill->rfkill_dev)
161 return -ENOMEM;
162
163 ret = rfkill_register(rfkill->rfkill_dev);
164 if (ret < 0)
165 return ret;
166
167 platform_set_drvdata(pdev, rfkill);
168
169 dev_info(&pdev->dev, "%s device registered.\n", rfkill->name);
170
171 return 0;
172}
173
174static int rfkill_gpio_remove(struct platform_device *pdev)
175{
176 struct rfkill_gpio_data *rfkill = platform_get_drvdata(pdev);
177 struct rfkill_gpio_platform_data *pdata = pdev->dev.platform_data;
178
179 if (pdata && pdata->gpio_runtime_close)
180 pdata->gpio_runtime_close(pdev);
181 rfkill_unregister(rfkill->rfkill_dev);
182 rfkill_destroy(rfkill->rfkill_dev);
183
184 return 0;
185}
186
187static const struct acpi_device_id rfkill_acpi_match[] = {
188 { "BCM4752", RFKILL_TYPE_GPS },
189 { },
190};
191
192static struct platform_driver rfkill_gpio_driver = {
193 .probe = rfkill_gpio_probe,
194 .remove = rfkill_gpio_remove,
195 .driver = {
196 .name = "rfkill_gpio",
197 .owner = THIS_MODULE,
198 .acpi_match_table = ACPI_PTR(rfkill_acpi_match),
199 },
200};
201
202module_platform_driver(rfkill_gpio_driver);
203
204MODULE_DESCRIPTION("gpio rfkill");
205MODULE_AUTHOR("NVIDIA");
206MODULE_LICENSE("GPL");