1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 4 bttv-gpio.c -- gpio sub drivers 5 6 sysfs-based sub driver interface for bttv 7 mainly intended for gpio access 8 9 10 Copyright (C) 1996,97,98 Ralph Metzler (rjkm@thp.uni-koeln.de) 11 & Marcus Metzler (mocm@thp.uni-koeln.de) 12 (c) 1999-2003 Gerd Knorr <kraxel@bytesex.org> 13 14 15 */ 16 17 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 18 19 #include <linux/module.h> 20 #include <linux/init.h> 21 #include <linux/delay.h> 22 #include <linux/device.h> 23 #include <linux/slab.h> 24 #include <asm/io.h> 25 26 #include "bttvp.h" 27 28 /* ----------------------------------------------------------------------- */ 29 /* internal: the bttv "bus" */ 30 31 static int bttv_sub_bus_match(struct device *dev, struct device_driver *drv) 32 { 33 struct bttv_sub_driver *sub = to_bttv_sub_drv(drv); 34 int len = strlen(sub->wanted); 35 36 if (0 == strncmp(dev_name(dev), sub->wanted, len)) 37 return 1; 38 return 0; 39 } 40 41 static int bttv_sub_probe(struct device *dev) 42 { 43 struct bttv_sub_device *sdev = to_bttv_sub_dev(dev); 44 struct bttv_sub_driver *sub = to_bttv_sub_drv(dev->driver); 45 46 return sub->probe ? sub->probe(sdev) : -ENODEV; 47 } 48 49 static void bttv_sub_remove(struct device *dev) 50 { 51 struct bttv_sub_device *sdev = to_bttv_sub_dev(dev); 52 struct bttv_sub_driver *sub = to_bttv_sub_drv(dev->driver); 53 54 if (sub->remove) 55 sub->remove(sdev); 56 } 57 58 struct bus_type bttv_sub_bus_type = { 59 .name = "bttv-sub", 60 .match = &bttv_sub_bus_match, 61 .probe = bttv_sub_probe, 62 .remove = bttv_sub_remove, 63 }; 64 65 static void release_sub_device(struct device *dev) 66 { 67 struct bttv_sub_device *sub = to_bttv_sub_dev(dev); 68 kfree(sub); 69 } 70 71 int bttv_sub_add_device(struct bttv_core *core, char *name) 72 { 73 struct bttv_sub_device *sub; 74 int err; 75 76 sub = kzalloc(sizeof(*sub),GFP_KERNEL); 77 if (NULL == sub) 78 return -ENOMEM; 79 80 sub->core = core; 81 sub->dev.parent = &core->pci->dev; 82 sub->dev.bus = &bttv_sub_bus_type; 83 sub->dev.release = release_sub_device; 84 dev_set_name(&sub->dev, "%s%d", name, core->nr); 85 86 err = device_register(&sub->dev); 87 if (0 != err) { 88 put_device(&sub->dev); 89 return err; 90 } 91 pr_info("%d: add subdevice \"%s\"\n", core->nr, dev_name(&sub->dev)); 92 list_add_tail(&sub->list,&core->subs); 93 return 0; 94 } 95 96 int bttv_sub_del_devices(struct bttv_core *core) 97 { 98 struct bttv_sub_device *sub, *save; 99 100 list_for_each_entry_safe(sub, save, &core->subs, list) { 101 list_del(&sub->list); 102 device_unregister(&sub->dev); 103 } 104 return 0; 105 } 106 107 /* ----------------------------------------------------------------------- */ 108 /* external: sub-driver register/unregister */ 109 110 int bttv_sub_register(struct bttv_sub_driver *sub, char *wanted) 111 { 112 sub->drv.bus = &bttv_sub_bus_type; 113 snprintf(sub->wanted,sizeof(sub->wanted),"%s",wanted); 114 return driver_register(&sub->drv); 115 } 116 EXPORT_SYMBOL(bttv_sub_register); 117 118 int bttv_sub_unregister(struct bttv_sub_driver *sub) 119 { 120 driver_unregister(&sub->drv); 121 return 0; 122 } 123 EXPORT_SYMBOL(bttv_sub_unregister); 124 125 /* ----------------------------------------------------------------------- */ 126 /* external: gpio access functions */ 127 128 void bttv_gpio_inout(struct bttv_core *core, u32 mask, u32 outbits) 129 { 130 struct bttv *btv = container_of(core, struct bttv, c); 131 unsigned long flags; 132 u32 data; 133 134 spin_lock_irqsave(&btv->gpio_lock,flags); 135 data = btread(BT848_GPIO_OUT_EN); 136 data = data & ~mask; 137 data = data | (mask & outbits); 138 btwrite(data,BT848_GPIO_OUT_EN); 139 spin_unlock_irqrestore(&btv->gpio_lock,flags); 140 } 141 142 u32 bttv_gpio_read(struct bttv_core *core) 143 { 144 struct bttv *btv = container_of(core, struct bttv, c); 145 u32 value; 146 147 value = btread(BT848_GPIO_DATA); 148 return value; 149 } 150 151 void bttv_gpio_write(struct bttv_core *core, u32 value) 152 { 153 struct bttv *btv = container_of(core, struct bttv, c); 154 155 btwrite(value,BT848_GPIO_DATA); 156 } 157 158 void bttv_gpio_bits(struct bttv_core *core, u32 mask, u32 bits) 159 { 160 struct bttv *btv = container_of(core, struct bttv, c); 161 unsigned long flags; 162 u32 data; 163 164 spin_lock_irqsave(&btv->gpio_lock,flags); 165 data = btread(BT848_GPIO_DATA); 166 data = data & ~mask; 167 data = data | (mask & bits); 168 btwrite(data,BT848_GPIO_DATA); 169 spin_unlock_irqrestore(&btv->gpio_lock,flags); 170 } 171