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15#include <linux/module.h>
16#include <linux/kernel.h>
17#include <linux/init.h>
18#include <linux/platform_device.h>
19#include <linux/gpio.h>
20#include <linux/bitops.h>
21#include <linux/io.h>
22
23#define DRV_NAME "gpio-sch311x"
24
25#define SCH311X_GPIO_CONF_OUT 0x00
26#define SCH311X_GPIO_CONF_IN 0x01
27#define SCH311X_GPIO_CONF_INVERT 0x02
28#define SCH311X_GPIO_CONF_OPEN_DRAIN 0x80
29
30#define SIO_CONFIG_KEY_ENTER 0x55
31#define SIO_CONFIG_KEY_EXIT 0xaa
32
33#define GP1 0x4b
34
35static int sch311x_ioports[] = { 0x2e, 0x4e, 0x162e, 0x164e };
36
37static struct platform_device *sch311x_gpio_pdev;
38
39struct sch311x_pdev_data {
40 unsigned short runtime_reg;
41};
42
43struct sch311x_gpio_block {
44 struct gpio_chip chip;
45 unsigned short data_reg;
46 unsigned short *config_regs;
47 unsigned short runtime_reg;
48 spinlock_t lock;
49};
50
51struct sch311x_gpio_priv {
52 struct sch311x_gpio_block blocks[6];
53};
54
55struct sch311x_gpio_block_def {
56 unsigned short data_reg;
57 unsigned short config_regs[8];
58 unsigned short base;
59};
60
61
62
63static struct sch311x_gpio_block_def sch311x_gpio_blocks[] = {
64 {
65 .data_reg = 0x4b,
66 .config_regs = {0x23, 0x24, 0x25, 0x26, 0x27, 0x29, 0x2a, 0x2b},
67 .base = 10,
68 },
69 {
70 .data_reg = 0x4c,
71 .config_regs = {0x00, 0x2c, 0x2d, 0x00, 0x00, 0x00, 0x00, 0x32},
72 .base = 20,
73 },
74 {
75 .data_reg = 0x4d,
76 .config_regs = {0x33, 0x34, 0x35, 0x36, 0x37, 0x00, 0x39, 0x3a},
77 .base = 30,
78 },
79 {
80 .data_reg = 0x4e,
81 .config_regs = {0x3b, 0x00, 0x3d, 0x00, 0x6e, 0x6f, 0x72, 0x73},
82 .base = 40,
83 },
84 {
85 .data_reg = 0x4f,
86 .config_regs = {0x3f, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46},
87 .base = 50,
88 },
89 {
90 .data_reg = 0x50,
91 .config_regs = {0x47, 0x48, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59},
92 .base = 60,
93 },
94};
95
96static inline struct sch311x_gpio_block *
97to_sch311x_gpio_block(struct gpio_chip *chip)
98{
99 return container_of(chip, struct sch311x_gpio_block, chip);
100}
101
102
103
104
105
106
107static inline int sch311x_sio_enter(int sio_config_port)
108{
109
110 if (!request_muxed_region(sio_config_port, 2, DRV_NAME)) {
111 pr_err(DRV_NAME "I/O address 0x%04x already in use\n",
112 sio_config_port);
113 return -EBUSY;
114 }
115
116 outb(SIO_CONFIG_KEY_ENTER, sio_config_port);
117 return 0;
118}
119
120static inline void sch311x_sio_exit(int sio_config_port)
121{
122 outb(SIO_CONFIG_KEY_EXIT, sio_config_port);
123 release_region(sio_config_port, 2);
124}
125
126static inline int sch311x_sio_inb(int sio_config_port, int reg)
127{
128 outb(reg, sio_config_port);
129 return inb(sio_config_port + 1);
130}
131
132static inline void sch311x_sio_outb(int sio_config_port, int reg, int val)
133{
134 outb(reg, sio_config_port);
135 outb(val, sio_config_port + 1);
136}
137
138
139
140
141
142
143static int sch311x_gpio_request(struct gpio_chip *chip, unsigned offset)
144{
145 struct sch311x_gpio_block *block = to_sch311x_gpio_block(chip);
146
147 if (block->config_regs[offset] == 0)
148 return -ENODEV;
149
150 if (!request_region(block->runtime_reg + block->config_regs[offset],
151 1, DRV_NAME)) {
152 dev_err(chip->dev, "Failed to request region 0x%04x.\n",
153 block->runtime_reg + block->config_regs[offset]);
154 return -EBUSY;
155 }
156 return 0;
157}
158
159static void sch311x_gpio_free(struct gpio_chip *chip, unsigned offset)
160{
161 struct sch311x_gpio_block *block = to_sch311x_gpio_block(chip);
162
163 if (block->config_regs[offset] == 0)
164 return;
165
166 release_region(block->runtime_reg + block->config_regs[offset], 1);
167}
168
169static int sch311x_gpio_get(struct gpio_chip *chip, unsigned offset)
170{
171 struct sch311x_gpio_block *block = to_sch311x_gpio_block(chip);
172 unsigned char data;
173
174 spin_lock(&block->lock);
175 data = inb(block->runtime_reg + block->data_reg);
176 spin_unlock(&block->lock);
177
178 return !!(data & BIT(offset));
179}
180
181static void __sch311x_gpio_set(struct sch311x_gpio_block *block,
182 unsigned offset, int value)
183{
184 unsigned char data = inb(block->runtime_reg + block->data_reg);
185 if (value)
186 data |= BIT(offset);
187 else
188 data &= ~BIT(offset);
189 outb(data, block->runtime_reg + block->data_reg);
190}
191
192static void sch311x_gpio_set(struct gpio_chip *chip, unsigned offset,
193 int value)
194{
195 struct sch311x_gpio_block *block = to_sch311x_gpio_block(chip);
196
197 spin_lock(&block->lock);
198 __sch311x_gpio_set(block, offset, value);
199 spin_unlock(&block->lock);
200}
201
202static int sch311x_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
203{
204 struct sch311x_gpio_block *block = to_sch311x_gpio_block(chip);
205
206 spin_lock(&block->lock);
207 outb(SCH311X_GPIO_CONF_IN, block->runtime_reg +
208 block->config_regs[offset]);
209 spin_unlock(&block->lock);
210
211 return 0;
212}
213
214static int sch311x_gpio_direction_out(struct gpio_chip *chip, unsigned offset,
215 int value)
216{
217 struct sch311x_gpio_block *block = to_sch311x_gpio_block(chip);
218
219 spin_lock(&block->lock);
220
221 outb(SCH311X_GPIO_CONF_OUT, block->runtime_reg +
222 block->config_regs[offset]);
223
224 __sch311x_gpio_set(block, offset, value);
225
226 spin_unlock(&block->lock);
227 return 0;
228}
229
230static int sch311x_gpio_probe(struct platform_device *pdev)
231{
232 struct sch311x_pdev_data *pdata = pdev->dev.platform_data;
233 struct sch311x_gpio_priv *priv;
234 struct sch311x_gpio_block *block;
235 int err, i;
236
237
238 if (!request_region(pdata->runtime_reg + GP1, 6, DRV_NAME)) {
239 dev_err(&pdev->dev, "Failed to request region 0x%04x-0x%04x.\n",
240 pdata->runtime_reg + GP1, pdata->runtime_reg + GP1 + 5);
241 return -EBUSY;
242 }
243
244 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
245 if (!priv)
246 return -ENOMEM;
247
248 platform_set_drvdata(pdev, priv);
249
250 for (i = 0; i < ARRAY_SIZE(priv->blocks); i++) {
251 block = &priv->blocks[i];
252
253 spin_lock_init(&block->lock);
254
255 block->chip.label = DRV_NAME;
256 block->chip.owner = THIS_MODULE;
257 block->chip.request = sch311x_gpio_request;
258 block->chip.free = sch311x_gpio_free;
259 block->chip.direction_input = sch311x_gpio_direction_in;
260 block->chip.direction_output = sch311x_gpio_direction_out;
261 block->chip.get = sch311x_gpio_get;
262 block->chip.set = sch311x_gpio_set;
263 block->chip.ngpio = 8;
264 block->chip.dev = &pdev->dev;
265 block->chip.base = sch311x_gpio_blocks[i].base;
266 block->config_regs = sch311x_gpio_blocks[i].config_regs;
267 block->data_reg = sch311x_gpio_blocks[i].data_reg;
268 block->runtime_reg = pdata->runtime_reg;
269
270 err = gpiochip_add(&block->chip);
271 if (err < 0) {
272 dev_err(&pdev->dev,
273 "Could not register gpiochip, %d\n", err);
274 goto exit_err;
275 }
276 dev_info(&pdev->dev,
277 "SMSC SCH311x GPIO block %d registered.\n", i);
278 }
279
280 return 0;
281
282exit_err:
283 release_region(pdata->runtime_reg + GP1, 6);
284
285 for (--i; i >= 0; i--)
286 gpiochip_remove(&priv->blocks[i].chip);
287 return err;
288}
289
290static int sch311x_gpio_remove(struct platform_device *pdev)
291{
292 struct sch311x_pdev_data *pdata = pdev->dev.platform_data;
293 struct sch311x_gpio_priv *priv = platform_get_drvdata(pdev);
294 int i;
295
296 release_region(pdata->runtime_reg + GP1, 6);
297
298 for (i = 0; i < ARRAY_SIZE(priv->blocks); i++) {
299 gpiochip_remove(&priv->blocks[i].chip);
300 dev_info(&pdev->dev,
301 "SMSC SCH311x GPIO block %d unregistered.\n", i);
302 }
303 return 0;
304}
305
306static struct platform_driver sch311x_gpio_driver = {
307 .driver.name = DRV_NAME,
308 .driver.owner = THIS_MODULE,
309 .probe = sch311x_gpio_probe,
310 .remove = sch311x_gpio_remove,
311};
312
313
314
315
316
317
318static int __init sch311x_detect(int sio_config_port, unsigned short *addr)
319{
320 int err = 0, reg;
321 unsigned short base_addr;
322 unsigned char dev_id;
323
324 err = sch311x_sio_enter(sio_config_port);
325 if (err)
326 return err;
327
328
329 reg = sch311x_sio_inb(sio_config_port, 0x20);
330 switch (reg) {
331 case 0x7c:
332 dev_id = 2;
333 break;
334 case 0x7d:
335 dev_id = 4;
336 break;
337 case 0x7f:
338 dev_id = 6;
339 break;
340 default:
341 err = -ENODEV;
342 goto exit;
343 }
344
345
346 sch311x_sio_outb(sio_config_port, 0x07, 0x0a);
347
348
349 if ((sch311x_sio_inb(sio_config_port, 0x30) & 0x01) == 0)
350 pr_info("Seems that LDN 0x0a is not active...\n");
351
352
353 base_addr = (sch311x_sio_inb(sio_config_port, 0x60) << 8) |
354 sch311x_sio_inb(sio_config_port, 0x61);
355 if (!base_addr) {
356 pr_err("Base address not set\n");
357 err = -ENODEV;
358 goto exit;
359 }
360 *addr = base_addr;
361
362 pr_info("Found an SMSC SCH311%d chip at 0x%04x\n", dev_id, base_addr);
363
364exit:
365 sch311x_sio_exit(sio_config_port);
366 return err;
367}
368
369static int __init sch311x_gpio_pdev_add(const unsigned short addr)
370{
371 struct sch311x_pdev_data pdata;
372 int err;
373
374 pdata.runtime_reg = addr;
375
376 sch311x_gpio_pdev = platform_device_alloc(DRV_NAME, -1);
377 if (!sch311x_gpio_pdev)
378 return -ENOMEM;
379
380 err = platform_device_add_data(sch311x_gpio_pdev,
381 &pdata, sizeof(pdata));
382 if (err) {
383 pr_err(DRV_NAME "Platform data allocation failed\n");
384 goto err;
385 }
386
387 err = platform_device_add(sch311x_gpio_pdev);
388 if (err) {
389 pr_err(DRV_NAME "Device addition failed\n");
390 goto err;
391 }
392 return 0;
393
394err:
395 platform_device_put(sch311x_gpio_pdev);
396 return err;
397}
398
399static int __init sch311x_gpio_init(void)
400{
401 int err, i;
402 unsigned short addr = 0;
403
404 for (i = 0; i < ARRAY_SIZE(sch311x_ioports); i++)
405 if (sch311x_detect(sch311x_ioports[i], &addr) == 0)
406 break;
407
408 if (!addr)
409 return -ENODEV;
410
411 err = platform_driver_register(&sch311x_gpio_driver);
412 if (err)
413 return err;
414
415 err = sch311x_gpio_pdev_add(addr);
416 if (err)
417 goto unreg_platform_driver;
418
419 return 0;
420
421unreg_platform_driver:
422 platform_driver_unregister(&sch311x_gpio_driver);
423 return err;
424}
425
426static void __exit sch311x_gpio_exit(void)
427{
428 platform_device_unregister(sch311x_gpio_pdev);
429 platform_driver_unregister(&sch311x_gpio_driver);
430}
431
432module_init(sch311x_gpio_init);
433module_exit(sch311x_gpio_exit);
434
435MODULE_AUTHOR("Bruno Randolf <br1@einfach.org>");
436MODULE_DESCRIPTION("SMSC SCH311x GPIO Driver");
437MODULE_LICENSE("GPL");
438MODULE_ALIAS("platform:gpio-sch311x");
439
