Rhyland Klein | 7176ba2 | 2011-05-16 14:41:48 -0700 | [diff] [blame] | 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> |
Heikki Krogerus | ef91ffa | 2013-10-16 13:53:43 +0300 | [diff] [blame] | 27 | #include <linux/acpi.h> |
Heikki Krogerus | 2111cad | 2013-11-26 12:05:46 +0200 | [diff] [blame] | 28 | #include <linux/gpio/consumer.h> |
Rhyland Klein | 7176ba2 | 2011-05-16 14:41:48 -0700 | [diff] [blame] | 29 | |
| 30 | #include <linux/rfkill-gpio.h> |
| 31 | |
Rhyland Klein | 7176ba2 | 2011-05-16 14:41:48 -0700 | [diff] [blame] | 32 | struct rfkill_gpio_data { |
Heikki Krogerus | 262c91e | 2013-10-16 13:53:42 +0300 | [diff] [blame] | 33 | const char *name; |
| 34 | enum rfkill_type type; |
Heikki Krogerus | 2111cad | 2013-11-26 12:05:46 +0200 | [diff] [blame] | 35 | struct gpio_desc *reset_gpio; |
| 36 | struct gpio_desc *shutdown_gpio; |
Heikki Krogerus | 262c91e | 2013-10-16 13:53:42 +0300 | [diff] [blame] | 37 | |
| 38 | struct rfkill *rfkill_dev; |
| 39 | char *reset_name; |
| 40 | char *shutdown_name; |
| 41 | struct clk *clk; |
| 42 | |
| 43 | bool clk_enabled; |
Rhyland Klein | 7176ba2 | 2011-05-16 14:41:48 -0700 | [diff] [blame] | 44 | }; |
| 45 | |
| 46 | static int rfkill_gpio_set_power(void *data, bool blocked) |
| 47 | { |
| 48 | struct rfkill_gpio_data *rfkill = data; |
| 49 | |
| 50 | if (blocked) { |
Heikki Krogerus | 2111cad | 2013-11-26 12:05:46 +0200 | [diff] [blame] | 51 | gpiod_set_value(rfkill->shutdown_gpio, 0); |
| 52 | gpiod_set_value(rfkill->reset_gpio, 0); |
Heikki Krogerus | f02ae59 | 2013-10-16 13:53:40 +0300 | [diff] [blame] | 53 | if (!IS_ERR(rfkill->clk) && rfkill->clk_enabled) |
| 54 | clk_disable(rfkill->clk); |
Rhyland Klein | 7176ba2 | 2011-05-16 14:41:48 -0700 | [diff] [blame] | 55 | } else { |
Heikki Krogerus | f02ae59 | 2013-10-16 13:53:40 +0300 | [diff] [blame] | 56 | if (!IS_ERR(rfkill->clk) && !rfkill->clk_enabled) |
| 57 | clk_enable(rfkill->clk); |
Heikki Krogerus | 2111cad | 2013-11-26 12:05:46 +0200 | [diff] [blame] | 58 | gpiod_set_value(rfkill->reset_gpio, 1); |
| 59 | gpiod_set_value(rfkill->shutdown_gpio, 1); |
Rhyland Klein | 7176ba2 | 2011-05-16 14:41:48 -0700 | [diff] [blame] | 60 | } |
| 61 | |
Heikki Krogerus | f02ae59 | 2013-10-16 13:53:40 +0300 | [diff] [blame] | 62 | rfkill->clk_enabled = blocked; |
Rhyland Klein | 7176ba2 | 2011-05-16 14:41:48 -0700 | [diff] [blame] | 63 | |
| 64 | return 0; |
| 65 | } |
| 66 | |
| 67 | static const struct rfkill_ops rfkill_gpio_ops = { |
| 68 | .set_block = rfkill_gpio_set_power, |
| 69 | }; |
| 70 | |
Heikki Krogerus | ef91ffa | 2013-10-16 13:53:43 +0300 | [diff] [blame] | 71 | static 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; |
Heikki Krogerus | ef91ffa | 2013-10-16 13:53:43 +0300 | [diff] [blame] | 82 | |
| 83 | return 0; |
| 84 | } |
| 85 | |
Rhyland Klein | 7176ba2 | 2011-05-16 14:41:48 -0700 | [diff] [blame] | 86 | static int rfkill_gpio_probe(struct platform_device *pdev) |
| 87 | { |
Rhyland Klein | 7176ba2 | 2011-05-16 14:41:48 -0700 | [diff] [blame] | 88 | struct rfkill_gpio_platform_data *pdata = pdev->dev.platform_data; |
Heikki Krogerus | 262c91e | 2013-10-16 13:53:42 +0300 | [diff] [blame] | 89 | struct rfkill_gpio_data *rfkill; |
Heikki Krogerus | 2111cad | 2013-11-26 12:05:46 +0200 | [diff] [blame] | 90 | struct gpio_desc *gpio; |
| 91 | int ret; |
| 92 | int len; |
Rhyland Klein | 7176ba2 | 2011-05-16 14:41:48 -0700 | [diff] [blame] | 93 | |
Heikki Krogerus | 5e7ca39 | 2013-10-16 13:53:39 +0300 | [diff] [blame] | 94 | rfkill = devm_kzalloc(&pdev->dev, sizeof(*rfkill), GFP_KERNEL); |
Rhyland Klein | 7176ba2 | 2011-05-16 14:41:48 -0700 | [diff] [blame] | 95 | if (!rfkill) |
| 96 | return -ENOMEM; |
| 97 | |
Heikki Krogerus | ef91ffa | 2013-10-16 13:53:43 +0300 | [diff] [blame] | 98 | if (ACPI_HANDLE(&pdev->dev)) { |
| 99 | ret = rfkill_gpio_acpi_probe(&pdev->dev, rfkill); |
| 100 | if (ret) |
| 101 | return ret; |
| 102 | } else if (pdata) { |
Heikki Krogerus | 262c91e | 2013-10-16 13:53:42 +0300 | [diff] [blame] | 103 | rfkill->name = pdata->name; |
| 104 | rfkill->type = pdata->type; |
Heikki Krogerus | 262c91e | 2013-10-16 13:53:42 +0300 | [diff] [blame] | 105 | } else { |
| 106 | return -ENODEV; |
| 107 | } |
| 108 | |
Heikki Krogerus | 262c91e | 2013-10-16 13:53:42 +0300 | [diff] [blame] | 109 | len = strlen(rfkill->name); |
Heikki Krogerus | 5e7ca39 | 2013-10-16 13:53:39 +0300 | [diff] [blame] | 110 | rfkill->reset_name = devm_kzalloc(&pdev->dev, len + 7, GFP_KERNEL); |
| 111 | if (!rfkill->reset_name) |
| 112 | return -ENOMEM; |
Rhyland Klein | 7176ba2 | 2011-05-16 14:41:48 -0700 | [diff] [blame] | 113 | |
Heikki Krogerus | 5e7ca39 | 2013-10-16 13:53:39 +0300 | [diff] [blame] | 114 | rfkill->shutdown_name = devm_kzalloc(&pdev->dev, len + 10, GFP_KERNEL); |
| 115 | if (!rfkill->shutdown_name) |
| 116 | return -ENOMEM; |
Rhyland Klein | 7176ba2 | 2011-05-16 14:41:48 -0700 | [diff] [blame] | 117 | |
Heikki Krogerus | 262c91e | 2013-10-16 13:53:42 +0300 | [diff] [blame] | 118 | snprintf(rfkill->reset_name, len + 6 , "%s_reset", rfkill->name); |
| 119 | snprintf(rfkill->shutdown_name, len + 9, "%s_shutdown", rfkill->name); |
Rhyland Klein | 7176ba2 | 2011-05-16 14:41:48 -0700 | [diff] [blame] | 120 | |
Heikki Krogerus | 848ef58 | 2014-04-01 17:02:53 +0300 | [diff] [blame] | 121 | rfkill->clk = devm_clk_get(&pdev->dev, NULL); |
Rhyland Klein | 7176ba2 | 2011-05-16 14:41:48 -0700 | [diff] [blame] | 122 | |
Heikki Krogerus | 2111cad | 2013-11-26 12:05:46 +0200 | [diff] [blame] | 123 | gpio = devm_gpiod_get_index(&pdev->dev, rfkill->reset_name, 0); |
| 124 | if (!IS_ERR(gpio)) { |
| 125 | ret = gpiod_direction_output(gpio, 0); |
| 126 | if (ret) |
Heikki Krogerus | 5e7ca39 | 2013-10-16 13:53:39 +0300 | [diff] [blame] | 127 | return ret; |
Heikki Krogerus | 2111cad | 2013-11-26 12:05:46 +0200 | [diff] [blame] | 128 | rfkill->reset_gpio = gpio; |
Rhyland Klein | 7176ba2 | 2011-05-16 14:41:48 -0700 | [diff] [blame] | 129 | } |
| 130 | |
Heikki Krogerus | 2111cad | 2013-11-26 12:05:46 +0200 | [diff] [blame] | 131 | gpio = devm_gpiod_get_index(&pdev->dev, rfkill->shutdown_name, 1); |
| 132 | if (!IS_ERR(gpio)) { |
| 133 | ret = gpiod_direction_output(gpio, 0); |
| 134 | if (ret) |
| 135 | return ret; |
| 136 | rfkill->shutdown_gpio = gpio; |
| 137 | } |
| 138 | |
| 139 | /* Make sure at-least one of the GPIO is defined and that |
| 140 | * a name is specified for this instance |
| 141 | */ |
| 142 | if ((!rfkill->reset_gpio && !rfkill->shutdown_gpio) || !rfkill->name) { |
| 143 | dev_err(&pdev->dev, "invalid platform data\n"); |
| 144 | return -EINVAL; |
| 145 | } |
| 146 | |
Heikki Krogerus | 262c91e | 2013-10-16 13:53:42 +0300 | [diff] [blame] | 147 | rfkill->rfkill_dev = rfkill_alloc(rfkill->name, &pdev->dev, |
| 148 | rfkill->type, &rfkill_gpio_ops, |
| 149 | rfkill); |
Heikki Krogerus | 5e7ca39 | 2013-10-16 13:53:39 +0300 | [diff] [blame] | 150 | if (!rfkill->rfkill_dev) |
| 151 | return -ENOMEM; |
Rhyland Klein | 7176ba2 | 2011-05-16 14:41:48 -0700 | [diff] [blame] | 152 | |
| 153 | ret = rfkill_register(rfkill->rfkill_dev); |
| 154 | if (ret < 0) |
Heikki Krogerus | 5e7ca39 | 2013-10-16 13:53:39 +0300 | [diff] [blame] | 155 | return ret; |
Rhyland Klein | 7176ba2 | 2011-05-16 14:41:48 -0700 | [diff] [blame] | 156 | |
| 157 | platform_set_drvdata(pdev, rfkill); |
| 158 | |
Heikki Krogerus | 262c91e | 2013-10-16 13:53:42 +0300 | [diff] [blame] | 159 | dev_info(&pdev->dev, "%s device registered.\n", rfkill->name); |
Rhyland Klein | 7176ba2 | 2011-05-16 14:41:48 -0700 | [diff] [blame] | 160 | |
| 161 | return 0; |
Rhyland Klein | 7176ba2 | 2011-05-16 14:41:48 -0700 | [diff] [blame] | 162 | } |
| 163 | |
| 164 | static int rfkill_gpio_remove(struct platform_device *pdev) |
| 165 | { |
| 166 | struct rfkill_gpio_data *rfkill = platform_get_drvdata(pdev); |
| 167 | |
Rhyland Klein | 7176ba2 | 2011-05-16 14:41:48 -0700 | [diff] [blame] | 168 | rfkill_unregister(rfkill->rfkill_dev); |
| 169 | rfkill_destroy(rfkill->rfkill_dev); |
Rhyland Klein | 7176ba2 | 2011-05-16 14:41:48 -0700 | [diff] [blame] | 170 | |
| 171 | return 0; |
| 172 | } |
| 173 | |
Heikki Krogerus | 41d09df | 2014-04-01 17:02:55 +0300 | [diff] [blame^] | 174 | #ifdef CONFIG_ACPI |
Heikki Krogerus | ef91ffa | 2013-10-16 13:53:43 +0300 | [diff] [blame] | 175 | static const struct acpi_device_id rfkill_acpi_match[] = { |
Heikki Krogerus | 41d09df | 2014-04-01 17:02:55 +0300 | [diff] [blame^] | 176 | { "BCM2E1A", RFKILL_TYPE_BLUETOOTH }, |
| 177 | { "BCM2E39", RFKILL_TYPE_BLUETOOTH }, |
| 178 | { "BCM2E3D", RFKILL_TYPE_BLUETOOTH }, |
Heikki Krogerus | ef91ffa | 2013-10-16 13:53:43 +0300 | [diff] [blame] | 179 | { "BCM4752", RFKILL_TYPE_GPS }, |
Heikki Krogerus | 04f1b47 | 2014-04-01 17:02:54 +0300 | [diff] [blame] | 180 | { "LNV4752", RFKILL_TYPE_GPS }, |
Heikki Krogerus | ef91ffa | 2013-10-16 13:53:43 +0300 | [diff] [blame] | 181 | { }, |
| 182 | }; |
Heikki Krogerus | 41d09df | 2014-04-01 17:02:55 +0300 | [diff] [blame^] | 183 | #endif |
Heikki Krogerus | ef91ffa | 2013-10-16 13:53:43 +0300 | [diff] [blame] | 184 | |
Rhyland Klein | 7176ba2 | 2011-05-16 14:41:48 -0700 | [diff] [blame] | 185 | static struct platform_driver rfkill_gpio_driver = { |
| 186 | .probe = rfkill_gpio_probe, |
Bill Pemberton | 9e2b29d | 2012-12-03 09:56:26 -0500 | [diff] [blame] | 187 | .remove = rfkill_gpio_remove, |
Rhyland Klein | 7176ba2 | 2011-05-16 14:41:48 -0700 | [diff] [blame] | 188 | .driver = { |
Heikki Krogerus | 262c91e | 2013-10-16 13:53:42 +0300 | [diff] [blame] | 189 | .name = "rfkill_gpio", |
| 190 | .owner = THIS_MODULE, |
Heikki Krogerus | ef91ffa | 2013-10-16 13:53:43 +0300 | [diff] [blame] | 191 | .acpi_match_table = ACPI_PTR(rfkill_acpi_match), |
Rhyland Klein | 7176ba2 | 2011-05-16 14:41:48 -0700 | [diff] [blame] | 192 | }, |
| 193 | }; |
| 194 | |
Axel Lin | 98ef55f6 | 2011-11-28 17:15:04 +0800 | [diff] [blame] | 195 | module_platform_driver(rfkill_gpio_driver); |
Rhyland Klein | 7176ba2 | 2011-05-16 14:41:48 -0700 | [diff] [blame] | 196 | |
| 197 | MODULE_DESCRIPTION("gpio rfkill"); |
| 198 | MODULE_AUTHOR("NVIDIA"); |
| 199 | MODULE_LICENSE("GPL"); |