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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/acpi_gpio.h>
29
30#include <linux/rfkill-gpio.h>
31
32struct rfkill_gpio_data {
33 const char *name;
34 enum rfkill_type type;
35 int reset_gpio;
36 int 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 if (gpio_is_valid(rfkill->shutdown_gpio))
52 gpio_set_value(rfkill->shutdown_gpio, 0);
53 if (gpio_is_valid(rfkill->reset_gpio))
54 gpio_set_value(rfkill->reset_gpio, 0);
55 if (!IS_ERR(rfkill->clk) && rfkill->clk_enabled)
56 clk_disable(rfkill->clk);
57 } else {
58 if (!IS_ERR(rfkill->clk) && !rfkill->clk_enabled)
59 clk_enable(rfkill->clk);
60 if (gpio_is_valid(rfkill->reset_gpio))
61 gpio_set_value(rfkill->reset_gpio, 1);
62 if (gpio_is_valid(rfkill->shutdown_gpio))
63 gpio_set_value(rfkill->shutdown_gpio, 1);
64 }
65
66 rfkill->clk_enabled = blocked;
67
68 return 0;
69}
70
71static const struct rfkill_ops rfkill_gpio_ops = {
72 .set_block = rfkill_gpio_set_power,
73};
74
75static int rfkill_gpio_acpi_probe(struct device *dev,
76 struct rfkill_gpio_data *rfkill)
77{
78 const struct acpi_device_id *id;
79
80 id = acpi_match_device(dev->driver->acpi_match_table, dev);
81 if (!id)
82 return -ENODEV;
83
84 rfkill->name = dev_name(dev);
85 rfkill->type = (unsigned)id->driver_data;
86 rfkill->reset_gpio = acpi_get_gpio_by_index(dev, 0, NULL);
87 rfkill->shutdown_gpio = acpi_get_gpio_by_index(dev, 1, NULL);
88
89 return 0;
90}
91
92static int rfkill_gpio_probe(struct platform_device *pdev)
93{
94 struct rfkill_gpio_platform_data *pdata = pdev->dev.platform_data;
95 struct rfkill_gpio_data *rfkill;
96 const char *clk_name = NULL;
97 int ret = 0;
98 int len = 0;
99
100 rfkill = devm_kzalloc(&pdev->dev, sizeof(*rfkill), GFP_KERNEL);
101 if (!rfkill)
102 return -ENOMEM;
103
104 if (ACPI_HANDLE(&pdev->dev)) {
105 ret = rfkill_gpio_acpi_probe(&pdev->dev, rfkill);
106 if (ret)
107 return ret;
108 } else if (pdata) {
109 clk_name = pdata->power_clk_name;
110 rfkill->name = pdata->name;
111 rfkill->type = pdata->type;
112 rfkill->reset_gpio = pdata->reset_gpio;
113 rfkill->shutdown_gpio = pdata->shutdown_gpio;
114 } else {
115 return -ENODEV;
116 }
117
118
119
120 if ((!gpio_is_valid(rfkill->reset_gpio) &&
121 !gpio_is_valid(rfkill->shutdown_gpio)) || !rfkill->name) {
122 pr_warn("%s: invalid platform data\n", __func__);
123 return -EINVAL;
124 }
125
126 if (pdata && pdata->gpio_runtime_setup) {
127 ret = pdata->gpio_runtime_setup(pdev);
128 if (ret) {
129 pr_warn("%s: can't set up gpio\n", __func__);
130 return ret;
131 }
132 }
133
134 len = strlen(rfkill->name);
135 rfkill->reset_name = devm_kzalloc(&pdev->dev, len + 7, GFP_KERNEL);
136 if (!rfkill->reset_name)
137 return -ENOMEM;
138
139 rfkill->shutdown_name = devm_kzalloc(&pdev->dev, len + 10, GFP_KERNEL);
140 if (!rfkill->shutdown_name)
141 return -ENOMEM;
142
143 snprintf(rfkill->reset_name, len + 6 , "%s_reset", rfkill->name);
144 snprintf(rfkill->shutdown_name, len + 9, "%s_shutdown", rfkill->name);
145
146 rfkill->clk = devm_clk_get(&pdev->dev, clk_name);
147
148 if (gpio_is_valid(rfkill->reset_gpio)) {
149 ret = devm_gpio_request_one(&pdev->dev, rfkill->reset_gpio,
150 0, rfkill->reset_name);
151 if (ret) {
152 pr_warn("%s: failed to get reset gpio.\n", __func__);
153 return ret;
154 }
155 }
156
157 if (gpio_is_valid(rfkill->shutdown_gpio)) {
158 ret = devm_gpio_request_one(&pdev->dev, rfkill->shutdown_gpio,
159 0, rfkill->shutdown_name);
160 if (ret) {
161 pr_warn("%s: failed to get shutdown gpio.\n", __func__);
162 return ret;
163 }
164 }
165
166 rfkill->rfkill_dev = rfkill_alloc(rfkill->name, &pdev->dev,
167 rfkill->type, &rfkill_gpio_ops,
168 rfkill);
169 if (!rfkill->rfkill_dev)
170 return -ENOMEM;
171
172 ret = rfkill_register(rfkill->rfkill_dev);
173 if (ret < 0)
174 return ret;
175
176 platform_set_drvdata(pdev, rfkill);
177
178 dev_info(&pdev->dev, "%s device registered.\n", rfkill->name);
179
180 return 0;
181}
182
183static int rfkill_gpio_remove(struct platform_device *pdev)
184{
185 struct rfkill_gpio_data *rfkill = platform_get_drvdata(pdev);
186 struct rfkill_gpio_platform_data *pdata = pdev->dev.platform_data;
187
188 if (pdata && pdata->gpio_runtime_close)
189 pdata->gpio_runtime_close(pdev);
190 rfkill_unregister(rfkill->rfkill_dev);
191 rfkill_destroy(rfkill->rfkill_dev);
192
193 return 0;
194}
195
196static const struct acpi_device_id rfkill_acpi_match[] = {
197 { "BCM4752", RFKILL_TYPE_GPS },
198 { },
199};
200
201static struct platform_driver rfkill_gpio_driver = {
202 .probe = rfkill_gpio_probe,
203 .remove = rfkill_gpio_remove,
204 .driver = {
205 .name = "rfkill_gpio",
206 .owner = THIS_MODULE,
207 .acpi_match_table = ACPI_PTR(rfkill_acpi_match),
208 },
209};
210
211module_platform_driver(rfkill_gpio_driver);
212
213MODULE_DESCRIPTION("gpio rfkill");
214MODULE_AUTHOR("NVIDIA");
215MODULE_LICENSE("GPL");
216
