1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3
4 bt8xx GPIO abuser
5
6 Copyright (C) 2008 Michael Buesch <m@bues.ch>
7
8 Please do _only_ contact the people listed _above_ with issues related to this driver.
9 All the other people listed below are not related to this driver. Their names
10 are only here, because this driver is derived from the bt848 driver.
11
12
13 Derived from the bt848 driver:
14
15 Copyright (C) 1996,97,98 Ralph Metzler
16 & Marcus Metzler
17 (c) 1999-2002 Gerd Knorr
18
19 some v4l2 code lines are taken from Justin's bttv2 driver which is
20 (c) 2000 Justin Schoeman
21
22 V4L1 removal from:
23 (c) 2005-2006 Nickolay V. Shmyrev
24
25 Fixes to be fully V4L2 compliant by
26 (c) 2006 Mauro Carvalho Chehab
27
28 Cropping and overscan support
29 Copyright (C) 2005, 2006 Michael H. Schimek
30 Sponsored by OPQ Systems AB
31
32 */
33
34 #include <linux/module.h>
35 #include <linux/pci.h>
36 #include <linux/spinlock.h>
37 #include <linux/gpio/driver.h>
38 #include <linux/slab.h>
39
40 /* Steal the hardware definitions from the bttv driver. */
41 #include "../media/pci/bt8xx/bt848.h"
42
43
44 #define BT8XXGPIO_NR_GPIOS 24 /* We have 24 GPIO pins */
45
46
47 struct bt8xxgpio {
48 spinlock_t lock;
49
50 void __iomem *mmio;
51 struct pci_dev *pdev;
52 struct gpio_chip gpio;
53
54 #ifdef CONFIG_PM
55 u32 saved_outen;
56 u32 saved_data;
57 #endif
58 };
59
60 #define bgwrite(dat, adr) writel((dat), bg->mmio+(adr))
61 #define bgread(adr) readl(bg->mmio+(adr))
62
63
64 static int modparam_gpiobase = -1/* dynamic */;
65 module_param_named(gpiobase, modparam_gpiobase, int, 0444);
66 MODULE_PARM_DESC(gpiobase, "The GPIO number base. -1 means dynamic, which is the default.");
67
68
bt8xxgpio_gpio_direction_input(struct gpio_chip * gpio,unsigned nr)69 static int bt8xxgpio_gpio_direction_input(struct gpio_chip *gpio, unsigned nr)
70 {
71 struct bt8xxgpio *bg = gpiochip_get_data(gpio);
72 unsigned long flags;
73 u32 outen, data;
74
75 spin_lock_irqsave(&bg->lock, flags);
76
77 data = bgread(BT848_GPIO_DATA);
78 data &= ~(1 << nr);
79 bgwrite(data, BT848_GPIO_DATA);
80
81 outen = bgread(BT848_GPIO_OUT_EN);
82 outen &= ~(1 << nr);
83 bgwrite(outen, BT848_GPIO_OUT_EN);
84
85 spin_unlock_irqrestore(&bg->lock, flags);
86
87 return 0;
88 }
89
bt8xxgpio_gpio_get(struct gpio_chip * gpio,unsigned nr)90 static int bt8xxgpio_gpio_get(struct gpio_chip *gpio, unsigned nr)
91 {
92 struct bt8xxgpio *bg = gpiochip_get_data(gpio);
93 unsigned long flags;
94 u32 val;
95
96 spin_lock_irqsave(&bg->lock, flags);
97 val = bgread(BT848_GPIO_DATA);
98 spin_unlock_irqrestore(&bg->lock, flags);
99
100 return !!(val & (1 << nr));
101 }
102
bt8xxgpio_gpio_direction_output(struct gpio_chip * gpio,unsigned nr,int val)103 static int bt8xxgpio_gpio_direction_output(struct gpio_chip *gpio,
104 unsigned nr, int val)
105 {
106 struct bt8xxgpio *bg = gpiochip_get_data(gpio);
107 unsigned long flags;
108 u32 outen, data;
109
110 spin_lock_irqsave(&bg->lock, flags);
111
112 outen = bgread(BT848_GPIO_OUT_EN);
113 outen |= (1 << nr);
114 bgwrite(outen, BT848_GPIO_OUT_EN);
115
116 data = bgread(BT848_GPIO_DATA);
117 if (val)
118 data |= (1 << nr);
119 else
120 data &= ~(1 << nr);
121 bgwrite(data, BT848_GPIO_DATA);
122
123 spin_unlock_irqrestore(&bg->lock, flags);
124
125 return 0;
126 }
127
bt8xxgpio_gpio_set(struct gpio_chip * gpio,unsigned nr,int val)128 static void bt8xxgpio_gpio_set(struct gpio_chip *gpio,
129 unsigned nr, int val)
130 {
131 struct bt8xxgpio *bg = gpiochip_get_data(gpio);
132 unsigned long flags;
133 u32 data;
134
135 spin_lock_irqsave(&bg->lock, flags);
136
137 data = bgread(BT848_GPIO_DATA);
138 if (val)
139 data |= (1 << nr);
140 else
141 data &= ~(1 << nr);
142 bgwrite(data, BT848_GPIO_DATA);
143
144 spin_unlock_irqrestore(&bg->lock, flags);
145 }
146
bt8xxgpio_gpio_setup(struct bt8xxgpio * bg)147 static void bt8xxgpio_gpio_setup(struct bt8xxgpio *bg)
148 {
149 struct gpio_chip *c = &bg->gpio;
150
151 c->label = dev_name(&bg->pdev->dev);
152 c->owner = THIS_MODULE;
153 c->direction_input = bt8xxgpio_gpio_direction_input;
154 c->get = bt8xxgpio_gpio_get;
155 c->direction_output = bt8xxgpio_gpio_direction_output;
156 c->set = bt8xxgpio_gpio_set;
157 c->dbg_show = NULL;
158 c->base = modparam_gpiobase;
159 c->ngpio = BT8XXGPIO_NR_GPIOS;
160 c->can_sleep = false;
161 }
162
bt8xxgpio_probe(struct pci_dev * dev,const struct pci_device_id * pci_id)163 static int bt8xxgpio_probe(struct pci_dev *dev,
164 const struct pci_device_id *pci_id)
165 {
166 struct bt8xxgpio *bg;
167 int err;
168
169 bg = devm_kzalloc(&dev->dev, sizeof(struct bt8xxgpio), GFP_KERNEL);
170 if (!bg)
171 return -ENOMEM;
172
173 bg->pdev = dev;
174 spin_lock_init(&bg->lock);
175
176 err = pci_enable_device(dev);
177 if (err) {
178 dev_err(&dev->dev, "can't enable device.\n");
179 return err;
180 }
181 if (!devm_request_mem_region(&dev->dev, pci_resource_start(dev, 0),
182 pci_resource_len(dev, 0),
183 "bt8xxgpio")) {
184 dev_warn(&dev->dev, "can't request iomem (0x%llx).\n",
185 (unsigned long long)pci_resource_start(dev, 0));
186 err = -EBUSY;
187 goto err_disable;
188 }
189 pci_set_master(dev);
190 pci_set_drvdata(dev, bg);
191
192 bg->mmio = devm_ioremap(&dev->dev, pci_resource_start(dev, 0), 0x1000);
193 if (!bg->mmio) {
194 dev_err(&dev->dev, "ioremap() failed\n");
195 err = -EIO;
196 goto err_disable;
197 }
198
199 /* Disable interrupts */
200 bgwrite(0, BT848_INT_MASK);
201
202 /* gpio init */
203 bgwrite(0, BT848_GPIO_DMA_CTL);
204 bgwrite(0, BT848_GPIO_REG_INP);
205 bgwrite(0, BT848_GPIO_OUT_EN);
206
207 bt8xxgpio_gpio_setup(bg);
208 err = gpiochip_add_data(&bg->gpio, bg);
209 if (err) {
210 dev_err(&dev->dev, "failed to register GPIOs\n");
211 goto err_disable;
212 }
213
214 return 0;
215
216 err_disable:
217 pci_disable_device(dev);
218
219 return err;
220 }
221
bt8xxgpio_remove(struct pci_dev * pdev)222 static void bt8xxgpio_remove(struct pci_dev *pdev)
223 {
224 struct bt8xxgpio *bg = pci_get_drvdata(pdev);
225
226 gpiochip_remove(&bg->gpio);
227
228 bgwrite(0, BT848_INT_MASK);
229 bgwrite(~0x0, BT848_INT_STAT);
230 bgwrite(0x0, BT848_GPIO_OUT_EN);
231
232 pci_disable_device(pdev);
233 }
234
235 #ifdef CONFIG_PM
bt8xxgpio_suspend(struct pci_dev * pdev,pm_message_t state)236 static int bt8xxgpio_suspend(struct pci_dev *pdev, pm_message_t state)
237 {
238 struct bt8xxgpio *bg = pci_get_drvdata(pdev);
239 unsigned long flags;
240
241 spin_lock_irqsave(&bg->lock, flags);
242
243 bg->saved_outen = bgread(BT848_GPIO_OUT_EN);
244 bg->saved_data = bgread(BT848_GPIO_DATA);
245
246 bgwrite(0, BT848_INT_MASK);
247 bgwrite(~0x0, BT848_INT_STAT);
248 bgwrite(0x0, BT848_GPIO_OUT_EN);
249
250 spin_unlock_irqrestore(&bg->lock, flags);
251
252 pci_save_state(pdev);
253 pci_disable_device(pdev);
254 pci_set_power_state(pdev, pci_choose_state(pdev, state));
255
256 return 0;
257 }
258
bt8xxgpio_resume(struct pci_dev * pdev)259 static int bt8xxgpio_resume(struct pci_dev *pdev)
260 {
261 struct bt8xxgpio *bg = pci_get_drvdata(pdev);
262 unsigned long flags;
263 int err;
264
265 pci_set_power_state(pdev, PCI_D0);
266 err = pci_enable_device(pdev);
267 if (err)
268 return err;
269 pci_restore_state(pdev);
270
271 spin_lock_irqsave(&bg->lock, flags);
272
273 bgwrite(0, BT848_INT_MASK);
274 bgwrite(0, BT848_GPIO_DMA_CTL);
275 bgwrite(0, BT848_GPIO_REG_INP);
276 bgwrite(bg->saved_outen, BT848_GPIO_OUT_EN);
277 bgwrite(bg->saved_data & bg->saved_outen,
278 BT848_GPIO_DATA);
279
280 spin_unlock_irqrestore(&bg->lock, flags);
281
282 return 0;
283 }
284 #else
285 #define bt8xxgpio_suspend NULL
286 #define bt8xxgpio_resume NULL
287 #endif /* CONFIG_PM */
288
289 static const struct pci_device_id bt8xxgpio_pci_tbl[] = {
290 { PCI_DEVICE(PCI_VENDOR_ID_BROOKTREE, PCI_DEVICE_ID_BT848) },
291 { PCI_DEVICE(PCI_VENDOR_ID_BROOKTREE, PCI_DEVICE_ID_BT849) },
292 { PCI_DEVICE(PCI_VENDOR_ID_BROOKTREE, PCI_DEVICE_ID_BT878) },
293 { PCI_DEVICE(PCI_VENDOR_ID_BROOKTREE, PCI_DEVICE_ID_BT879) },
294 { 0, },
295 };
296 MODULE_DEVICE_TABLE(pci, bt8xxgpio_pci_tbl);
297
298 static struct pci_driver bt8xxgpio_pci_driver = {
299 .name = "bt8xxgpio",
300 .id_table = bt8xxgpio_pci_tbl,
301 .probe = bt8xxgpio_probe,
302 .remove = bt8xxgpio_remove,
303 .suspend = bt8xxgpio_suspend,
304 .resume = bt8xxgpio_resume,
305 };
306
307 module_pci_driver(bt8xxgpio_pci_driver);
308
309 MODULE_LICENSE("GPL");
310 MODULE_AUTHOR("Michael Buesch");
311 MODULE_DESCRIPTION("Abuse a BT8xx framegrabber card as generic GPIO card");
312