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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 | // SPDX-License-Identifier: GPL-2.0-or-later /* bttv-gpio.c -- gpio sub drivers sysfs-based sub driver interface for bttv mainly intended for gpio access Copyright (C) 1996,97,98 Ralph Metzler (rjkm@thp.uni-koeln.de) & Marcus Metzler (mocm@thp.uni-koeln.de) (c) 1999-2003 Gerd Knorr <kraxel@bytesex.org> */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/module.h> #include <linux/init.h> #include <linux/delay.h> #include <linux/device.h> #include <linux/slab.h> #include <asm/io.h> #include "bttvp.h" /* ----------------------------------------------------------------------- */ /* internal: the bttv "bus" */ static int bttv_sub_bus_match(struct device *dev, struct device_driver *drv) { struct bttv_sub_driver *sub = to_bttv_sub_drv(drv); int len = strlen(sub->wanted); if (0 == strncmp(dev_name(dev), sub->wanted, len)) return 1; return 0; } static int bttv_sub_probe(struct device *dev) { struct bttv_sub_device *sdev = to_bttv_sub_dev(dev); struct bttv_sub_driver *sub = to_bttv_sub_drv(dev->driver); return sub->probe ? sub->probe(sdev) : -ENODEV; } static void bttv_sub_remove(struct device *dev) { struct bttv_sub_device *sdev = to_bttv_sub_dev(dev); struct bttv_sub_driver *sub = to_bttv_sub_drv(dev->driver); if (sub->remove) sub->remove(sdev); } struct bus_type bttv_sub_bus_type = { .name = "bttv-sub", .match = &bttv_sub_bus_match, .probe = bttv_sub_probe, .remove = bttv_sub_remove, }; static void release_sub_device(struct device *dev) { struct bttv_sub_device *sub = to_bttv_sub_dev(dev); kfree(sub); } int bttv_sub_add_device(struct bttv_core *core, char *name) { struct bttv_sub_device *sub; int err; sub = kzalloc(sizeof(*sub),GFP_KERNEL); if (NULL == sub) return -ENOMEM; sub->core = core; sub->dev.parent = &core->pci->dev; sub->dev.bus = &bttv_sub_bus_type; sub->dev.release = release_sub_device; dev_set_name(&sub->dev, "%s%d", name, core->nr); err = device_register(&sub->dev); if (0 != err) { put_device(&sub->dev); return err; } pr_info("%d: add subdevice \"%s\"\n", core->nr, dev_name(&sub->dev)); list_add_tail(&sub->list,&core->subs); return 0; } int bttv_sub_del_devices(struct bttv_core *core) { struct bttv_sub_device *sub, *save; list_for_each_entry_safe(sub, save, &core->subs, list) { list_del(&sub->list); device_unregister(&sub->dev); } return 0; } /* ----------------------------------------------------------------------- */ /* external: sub-driver register/unregister */ int bttv_sub_register(struct bttv_sub_driver *sub, char *wanted) { sub->drv.bus = &bttv_sub_bus_type; snprintf(sub->wanted,sizeof(sub->wanted),"%s",wanted); return driver_register(&sub->drv); } EXPORT_SYMBOL(bttv_sub_register); int bttv_sub_unregister(struct bttv_sub_driver *sub) { driver_unregister(&sub->drv); return 0; } EXPORT_SYMBOL(bttv_sub_unregister); /* ----------------------------------------------------------------------- */ /* external: gpio access functions */ void bttv_gpio_inout(struct bttv_core *core, u32 mask, u32 outbits) { struct bttv *btv = container_of(core, struct bttv, c); unsigned long flags; u32 data; spin_lock_irqsave(&btv->gpio_lock,flags); data = btread(BT848_GPIO_OUT_EN); data = data & ~mask; data = data | (mask & outbits); btwrite(data,BT848_GPIO_OUT_EN); spin_unlock_irqrestore(&btv->gpio_lock,flags); } u32 bttv_gpio_read(struct bttv_core *core) { struct bttv *btv = container_of(core, struct bttv, c); u32 value; value = btread(BT848_GPIO_DATA); return value; } void bttv_gpio_write(struct bttv_core *core, u32 value) { struct bttv *btv = container_of(core, struct bttv, c); btwrite(value,BT848_GPIO_DATA); } void bttv_gpio_bits(struct bttv_core *core, u32 mask, u32 bits) { struct bttv *btv = container_of(core, struct bttv, c); unsigned long flags; u32 data; spin_lock_irqsave(&btv->gpio_lock,flags); data = btread(BT848_GPIO_DATA); data = data & ~mask; data = data | (mask & bits); btwrite(data,BT848_GPIO_DATA); spin_unlock_irqrestore(&btv->gpio_lock,flags); } |