1
2
3
4
5
6
7
8
9
10
11#include <linux/ioport.h>
12#include <linux/module.h>
13#include <linux/kernel.h>
14#include <linux/init.h>
15#include <linux/platform_device.h>
16#include <linux/gpio/driver.h>
17#include <linux/bitops.h>
18#include <linux/io.h>
19
20#define DRV_NAME "gpio-sch311x"
21
22#define SCH311X_GPIO_CONF_DIR BIT(0)
23#define SCH311X_GPIO_CONF_INVERT BIT(1)
24#define SCH311X_GPIO_CONF_OPEN_DRAIN BIT(7)
25
26#define SIO_CONFIG_KEY_ENTER 0x55
27#define SIO_CONFIG_KEY_EXIT 0xaa
28
29#define GP1 0x4b
30
31static int sch311x_ioports[] = { 0x2e, 0x4e, 0x162e, 0x164e };
32
33static struct platform_device *sch311x_gpio_pdev;
34
35struct sch311x_pdev_data {
36 unsigned short runtime_reg;
37};
38
39struct sch311x_gpio_block {
40 struct gpio_chip chip;
41 unsigned short data_reg;
42 unsigned short *config_regs;
43 unsigned short runtime_reg;
44 spinlock_t lock;
45};
46
47struct sch311x_gpio_priv {
48 struct sch311x_gpio_block blocks[6];
49};
50
51struct sch311x_gpio_block_def {
52 unsigned short data_reg;
53 unsigned short config_regs[8];
54 unsigned short base;
55};
56
57
58
59static struct sch311x_gpio_block_def sch311x_gpio_blocks[] = {
60 {
61 .data_reg = 0x4b,
62 .config_regs = {0x23, 0x24, 0x25, 0x26, 0x27, 0x29, 0x2a, 0x2b},
63 .base = 10,
64 },
65 {
66 .data_reg = 0x4c,
67 .config_regs = {0x00, 0x2c, 0x2d, 0x00, 0x00, 0x00, 0x00, 0x32},
68 .base = 20,
69 },
70 {
71 .data_reg = 0x4d,
72 .config_regs = {0x33, 0x34, 0x35, 0x36, 0x37, 0x00, 0x39, 0x3a},
73 .base = 30,
74 },
75 {
76 .data_reg = 0x4e,
77 .config_regs = {0x3b, 0x00, 0x3d, 0x00, 0x6e, 0x6f, 0x72, 0x73},
78 .base = 40,
79 },
80 {
81 .data_reg = 0x4f,
82 .config_regs = {0x3f, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46},
83 .base = 50,
84 },
85 {
86 .data_reg = 0x50,
87 .config_regs = {0x47, 0x48, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59},
88 .base = 60,
89 },
90};
91
92
93
94
95
96static inline int sch311x_sio_enter(int sio_config_port)
97{
98
99 if (!request_muxed_region(sio_config_port, 2, DRV_NAME)) {
100 pr_err(DRV_NAME "I/O address 0x%04x already in use\n",
101 sio_config_port);
102 return -EBUSY;
103 }
104
105 outb(SIO_CONFIG_KEY_ENTER, sio_config_port);
106 return 0;
107}
108
109static inline void sch311x_sio_exit(int sio_config_port)
110{
111 outb(SIO_CONFIG_KEY_EXIT, sio_config_port);
112 release_region(sio_config_port, 2);
113}
114
115static inline int sch311x_sio_inb(int sio_config_port, int reg)
116{
117 outb(reg, sio_config_port);
118 return inb(sio_config_port + 1);
119}
120
121static inline void sch311x_sio_outb(int sio_config_port, int reg, int val)
122{
123 outb(reg, sio_config_port);
124 outb(val, sio_config_port + 1);
125}
126
127
128
129
130
131
132static int sch311x_gpio_request(struct gpio_chip *chip, unsigned offset)
133{
134 struct sch311x_gpio_block *block = gpiochip_get_data(chip);
135
136 if (block->config_regs[offset] == 0)
137 return -ENODEV;
138
139 if (!request_region(block->runtime_reg + block->config_regs[offset],
140 1, DRV_NAME)) {
141 dev_err(chip->parent, "Failed to request region 0x%04x.\n",
142 block->runtime_reg + block->config_regs[offset]);
143 return -EBUSY;
144 }
145 return 0;
146}
147
148static void sch311x_gpio_free(struct gpio_chip *chip, unsigned offset)
149{
150 struct sch311x_gpio_block *block = gpiochip_get_data(chip);
151
152 if (block->config_regs[offset] == 0)
153 return;
154
155 release_region(block->runtime_reg + block->config_regs[offset], 1);
156}
157
158static int sch311x_gpio_get(struct gpio_chip *chip, unsigned offset)
159{
160 struct sch311x_gpio_block *block = gpiochip_get_data(chip);
161 u8 data;
162
163 spin_lock(&block->lock);
164 data = inb(block->runtime_reg + block->data_reg);
165 spin_unlock(&block->lock);
166
167 return !!(data & BIT(offset));
168}
169
170static void __sch311x_gpio_set(struct sch311x_gpio_block *block,
171 unsigned offset, int value)
172{
173 u8 data = inb(block->runtime_reg + block->data_reg);
174 if (value)
175 data |= BIT(offset);
176 else
177 data &= ~BIT(offset);
178 outb(data, block->runtime_reg + block->data_reg);
179}
180
181static void sch311x_gpio_set(struct gpio_chip *chip, unsigned offset,
182 int value)
183{
184 struct sch311x_gpio_block *block = gpiochip_get_data(chip);
185
186 spin_lock(&block->lock);
187 __sch311x_gpio_set(block, offset, value);
188 spin_unlock(&block->lock);
189}
190
191static int sch311x_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
192{
193 struct sch311x_gpio_block *block = gpiochip_get_data(chip);
194 u8 data;
195
196 spin_lock(&block->lock);
197 data = inb(block->runtime_reg + block->config_regs[offset]);
198 data |= SCH311X_GPIO_CONF_DIR;
199 outb(data, block->runtime_reg + block->config_regs[offset]);
200 spin_unlock(&block->lock);
201
202 return 0;
203}
204
205static int sch311x_gpio_direction_out(struct gpio_chip *chip, unsigned offset,
206 int value)
207{
208 struct sch311x_gpio_block *block = gpiochip_get_data(chip);
209 u8 data;
210
211 spin_lock(&block->lock);
212
213 data = inb(block->runtime_reg + block->config_regs[offset]);
214 data &= ~SCH311X_GPIO_CONF_DIR;
215 outb(data, block->runtime_reg + block->config_regs[offset]);
216 __sch311x_gpio_set(block, offset, value);
217
218 spin_unlock(&block->lock);
219 return 0;
220}
221
222static int sch311x_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
223{
224 struct sch311x_gpio_block *block = gpiochip_get_data(chip);
225 u8 data;
226
227 spin_lock(&block->lock);
228 data = inb(block->runtime_reg + block->config_regs[offset]);
229 spin_unlock(&block->lock);
230
231 if (data & SCH311X_GPIO_CONF_DIR)
232 return GPIO_LINE_DIRECTION_IN;
233
234 return GPIO_LINE_DIRECTION_OUT;
235}
236
237static int sch311x_gpio_set_config(struct gpio_chip *chip, unsigned offset,
238 unsigned long config)
239{
240 struct sch311x_gpio_block *block = gpiochip_get_data(chip);
241 enum pin_config_param param = pinconf_to_config_param(config);
242 u8 data;
243
244 switch (param) {
245 case PIN_CONFIG_DRIVE_OPEN_DRAIN:
246 spin_lock(&block->lock);
247 data = inb(block->runtime_reg + block->config_regs[offset]);
248 data |= SCH311X_GPIO_CONF_OPEN_DRAIN;
249 outb(data, block->runtime_reg + block->config_regs[offset]);
250 spin_unlock(&block->lock);
251 return 0;
252 case PIN_CONFIG_DRIVE_PUSH_PULL:
253 spin_lock(&block->lock);
254 data = inb(block->runtime_reg + block->config_regs[offset]);
255 data &= ~SCH311X_GPIO_CONF_OPEN_DRAIN;
256 outb(data, block->runtime_reg + block->config_regs[offset]);
257 spin_unlock(&block->lock);
258 return 0;
259 default:
260 break;
261 }
262 return -ENOTSUPP;
263}
264
265static int sch311x_gpio_probe(struct platform_device *pdev)
266{
267 struct sch311x_pdev_data *pdata = dev_get_platdata(&pdev->dev);
268 struct sch311x_gpio_priv *priv;
269 struct sch311x_gpio_block *block;
270 int err, i;
271
272
273 if (!devm_request_region(&pdev->dev, pdata->runtime_reg + GP1, 6,
274 DRV_NAME)) {
275 dev_err(&pdev->dev, "Failed to request region 0x%04x-0x%04x.\n",
276 pdata->runtime_reg + GP1, pdata->runtime_reg + GP1 + 5);
277 return -EBUSY;
278 }
279
280 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
281 if (!priv)
282 return -ENOMEM;
283
284 platform_set_drvdata(pdev, priv);
285
286 for (i = 0; i < ARRAY_SIZE(priv->blocks); i++) {
287 block = &priv->blocks[i];
288
289 spin_lock_init(&block->lock);
290
291 block->chip.label = DRV_NAME;
292 block->chip.owner = THIS_MODULE;
293 block->chip.request = sch311x_gpio_request;
294 block->chip.free = sch311x_gpio_free;
295 block->chip.direction_input = sch311x_gpio_direction_in;
296 block->chip.direction_output = sch311x_gpio_direction_out;
297 block->chip.get_direction = sch311x_gpio_get_direction;
298 block->chip.set_config = sch311x_gpio_set_config;
299 block->chip.get = sch311x_gpio_get;
300 block->chip.set = sch311x_gpio_set;
301 block->chip.ngpio = 8;
302 block->chip.parent = &pdev->dev;
303 block->chip.base = sch311x_gpio_blocks[i].base;
304 block->config_regs = sch311x_gpio_blocks[i].config_regs;
305 block->data_reg = sch311x_gpio_blocks[i].data_reg;
306 block->runtime_reg = pdata->runtime_reg;
307
308 err = gpiochip_add_data(&block->chip, block);
309 if (err < 0) {
310 dev_err(&pdev->dev,
311 "Could not register gpiochip, %d\n", err);
312 goto exit_err;
313 }
314 dev_info(&pdev->dev,
315 "SMSC SCH311x GPIO block %d registered.\n", i);
316 }
317
318 return 0;
319
320exit_err:
321
322 for (--i; i >= 0; i--)
323 gpiochip_remove(&priv->blocks[i].chip);
324 return err;
325}
326
327static int sch311x_gpio_remove(struct platform_device *pdev)
328{
329 struct sch311x_gpio_priv *priv = platform_get_drvdata(pdev);
330 int i;
331
332 for (i = 0; i < ARRAY_SIZE(priv->blocks); i++) {
333 gpiochip_remove(&priv->blocks[i].chip);
334 dev_info(&pdev->dev,
335 "SMSC SCH311x GPIO block %d unregistered.\n", i);
336 }
337 return 0;
338}
339
340static struct platform_driver sch311x_gpio_driver = {
341 .driver.name = DRV_NAME,
342 .probe = sch311x_gpio_probe,
343 .remove = sch311x_gpio_remove,
344};
345
346
347
348
349
350
351static int __init sch311x_detect(int sio_config_port, unsigned short *addr)
352{
353 int err = 0, reg;
354 unsigned short base_addr;
355 u8 dev_id;
356
357 err = sch311x_sio_enter(sio_config_port);
358 if (err)
359 return err;
360
361
362 reg = sch311x_sio_inb(sio_config_port, 0x20);
363 switch (reg) {
364 case 0x7c:
365 dev_id = 2;
366 break;
367 case 0x7d:
368 dev_id = 4;
369 break;
370 case 0x7f:
371 dev_id = 6;
372 break;
373 default:
374 err = -ENODEV;
375 goto exit;
376 }
377
378
379 sch311x_sio_outb(sio_config_port, 0x07, 0x0a);
380
381
382 if ((sch311x_sio_inb(sio_config_port, 0x30) & 0x01) == 0)
383 pr_info("Seems that LDN 0x0a is not active...\n");
384
385
386 base_addr = (sch311x_sio_inb(sio_config_port, 0x60) << 8) |
387 sch311x_sio_inb(sio_config_port, 0x61);
388 if (!base_addr) {
389 pr_err("Base address not set\n");
390 err = -ENODEV;
391 goto exit;
392 }
393 *addr = base_addr;
394
395 pr_info("Found an SMSC SCH311%d chip at 0x%04x\n", dev_id, base_addr);
396
397exit:
398 sch311x_sio_exit(sio_config_port);
399 return err;
400}
401
402static int __init sch311x_gpio_pdev_add(const unsigned short addr)
403{
404 struct sch311x_pdev_data pdata;
405 int err;
406
407 pdata.runtime_reg = addr;
408
409 sch311x_gpio_pdev = platform_device_alloc(DRV_NAME, -1);
410 if (!sch311x_gpio_pdev)
411 return -ENOMEM;
412
413 err = platform_device_add_data(sch311x_gpio_pdev,
414 &pdata, sizeof(pdata));
415 if (err) {
416 pr_err(DRV_NAME "Platform data allocation failed\n");
417 goto err;
418 }
419
420 err = platform_device_add(sch311x_gpio_pdev);
421 if (err) {
422 pr_err(DRV_NAME "Device addition failed\n");
423 goto err;
424 }
425 return 0;
426
427err:
428 platform_device_put(sch311x_gpio_pdev);
429 return err;
430}
431
432static int __init sch311x_gpio_init(void)
433{
434 int err, i;
435 unsigned short addr = 0;
436
437 for (i = 0; i < ARRAY_SIZE(sch311x_ioports); i++)
438 if (sch311x_detect(sch311x_ioports[i], &addr) == 0)
439 break;
440
441 if (!addr)
442 return -ENODEV;
443
444 err = platform_driver_register(&sch311x_gpio_driver);
445 if (err)
446 return err;
447
448 err = sch311x_gpio_pdev_add(addr);
449 if (err)
450 goto unreg_platform_driver;
451
452 return 0;
453
454unreg_platform_driver:
455 platform_driver_unregister(&sch311x_gpio_driver);
456 return err;
457}
458
459static void __exit sch311x_gpio_exit(void)
460{
461 platform_device_unregister(sch311x_gpio_pdev);
462 platform_driver_unregister(&sch311x_gpio_driver);
463}
464
465module_init(sch311x_gpio_init);
466module_exit(sch311x_gpio_exit);
467
468MODULE_AUTHOR("Bruno Randolf <br1@einfach.org>");
469MODULE_DESCRIPTION("SMSC SCH311x GPIO Driver");
470MODULE_LICENSE("GPL");
471MODULE_ALIAS("platform:gpio-sch311x");
472
