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1/*
2 * GPIO driver for the SMSC SCH311x Super-I/O chips
3 *
4 * Copyright (C) 2013 Bruno Randolf <br1@einfach.org>
5 *
6 * SuperIO functions and chip detection:
7 * (c) Copyright 2008 Wim Van Sebroeck <wim@iguana.be>.
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 */
14
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 { /* platform device data */
40 unsigned short runtime_reg; /* runtime register base address */
41};
42
43struct sch311x_gpio_block { /* one GPIO block runtime data */
44 struct gpio_chip chip;
45 unsigned short data_reg; /* from definition below */
46 unsigned short *config_regs; /* pointer to definition below */
47 unsigned short runtime_reg; /* runtime register */
48 spinlock_t lock; /* lock for this GPIO block */
49};
50
51struct sch311x_gpio_priv { /* driver private data */
52 struct sch311x_gpio_block blocks[6];
53};
54
55struct sch311x_gpio_block_def { /* register address definitions */
56 unsigned short data_reg;
57 unsigned short config_regs[8];
58 unsigned short base;
59};
60
61/* Note: some GPIOs are not available, these are marked with 0x00 */
62
63static struct sch311x_gpio_block_def sch311x_gpio_blocks[] = {
64 {
65 .data_reg = 0x4b, /* GP1 */
66 .config_regs = {0x23, 0x24, 0x25, 0x26, 0x27, 0x29, 0x2a, 0x2b},
67 .base = 10,
68 },
69 {
70 .data_reg = 0x4c, /* GP2 */
71 .config_regs = {0x00, 0x2c, 0x2d, 0x00, 0x00, 0x00, 0x00, 0x32},
72 .base = 20,
73 },
74 {
75 .data_reg = 0x4d, /* GP3 */
76 .config_regs = {0x33, 0x34, 0x35, 0x36, 0x37, 0x00, 0x39, 0x3a},
77 .base = 30,
78 },
79 {
80 .data_reg = 0x4e, /* GP4 */
81 .config_regs = {0x3b, 0x00, 0x3d, 0x00, 0x6e, 0x6f, 0x72, 0x73},
82 .base = 40,
83 },
84 {
85 .data_reg = 0x4f, /* GP5 */
86 .config_regs = {0x3f, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46},
87 .base = 50,
88 },
89 {
90 .data_reg = 0x50, /* GP6 */
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 * Super-IO functions
105 */
106
107static inline int sch311x_sio_enter(int sio_config_port)
108{
109 /* Don't step on other drivers' I/O space by accident. */
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 * GPIO functions
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) /* GPIO is not available */
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) /* GPIO is not available */
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 /* we can register all GPIO data registers at once */
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 /* release already registered chips */
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 err, i;
295
296 release_region(pdata->runtime_reg + GP1, 6);
297
298 for (i = 0; i < ARRAY_SIZE(priv->blocks); i++) {
299 err = gpiochip_remove(&priv->blocks[i].chip);
300 if (err)
301 return err;
302 dev_info(&pdev->dev,
303 "SMSC SCH311x GPIO block %d unregistered.\n", i);
304 }
305 return 0;
306}
307
308static struct platform_driver sch311x_gpio_driver = {
309 .driver.name = DRV_NAME,
310 .driver.owner = THIS_MODULE,
311 .probe = sch311x_gpio_probe,
312 .remove = sch311x_gpio_remove,
313};
314
315
316/*
317 * Init & exit routines
318 */
319
320static int __init sch311x_detect(int sio_config_port, unsigned short *addr)
321{
322 int err = 0, reg;
323 unsigned short base_addr;
324 unsigned char dev_id;
325
326 err = sch311x_sio_enter(sio_config_port);
327 if (err)
328 return err;
329
330 /* Check device ID. We currently know about:
331 * SCH3112 (0x7c), SCH3114 (0x7d), and SCH3116 (0x7f). */
332 reg = sch311x_sio_inb(sio_config_port, 0x20);
333 if (!(reg == 0x7c || reg == 0x7d || reg == 0x7f)) {
334 err = -ENODEV;
335 goto exit;
336 }
337 dev_id = reg == 0x7c ? 2 : reg == 0x7d ? 4 : 6;
338
339 /* Select logical device A (runtime registers) */
340 sch311x_sio_outb(sio_config_port, 0x07, 0x0a);
341
342 /* Check if Logical Device Register is currently active */
343 if ((sch311x_sio_inb(sio_config_port, 0x30) & 0x01) == 0)
344 pr_info("Seems that LDN 0x0a is not active...\n");
345
346 /* Get the base address of the runtime registers */
347 base_addr = (sch311x_sio_inb(sio_config_port, 0x60) << 8) |
348 sch311x_sio_inb(sio_config_port, 0x61);
349 if (!base_addr) {
350 pr_err("Base address not set\n");
351 err = -ENODEV;
352 goto exit;
353 }
354 *addr = base_addr;
355
356 pr_info("Found an SMSC SCH311%d chip at 0x%04x\n", dev_id, base_addr);
357
358exit:
359 sch311x_sio_exit(sio_config_port);
360 return err;
361}
362
363static int __init sch311x_gpio_pdev_add(const unsigned short addr)
364{
365 struct sch311x_pdev_data pdata;
366 int err;
367
368 pdata.runtime_reg = addr;
369
370 sch311x_gpio_pdev = platform_device_alloc(DRV_NAME, -1);
371 if (!sch311x_gpio_pdev)
372 return -ENOMEM;
373
374 err = platform_device_add_data(sch311x_gpio_pdev,
375 &pdata, sizeof(pdata));
376 if (err) {
377 pr_err(DRV_NAME "Platform data allocation failed\n");
378 goto err;
379 }
380
381 err = platform_device_add(sch311x_gpio_pdev);
382 if (err) {
383 pr_err(DRV_NAME "Device addition failed\n");
384 goto err;
385 }
386 return 0;
387
388err:
389 platform_device_put(sch311x_gpio_pdev);
390 return err;
391}
392
393static int __init sch311x_gpio_init(void)
394{
395 int err, i;
396 unsigned short addr = 0;
397
398 for (i = 0; i < ARRAY_SIZE(sch311x_ioports); i++)
399 if (sch311x_detect(sch311x_ioports[i], &addr) == 0)
400 break;
401
402 if (!addr)
403 return -ENODEV;
404
405 err = platform_driver_register(&sch311x_gpio_driver);
406 if (err)
407 return err;
408
409 err = sch311x_gpio_pdev_add(addr);
410 if (err)
411 goto unreg_platform_driver;
412
413 return 0;
414
415unreg_platform_driver:
416 platform_driver_unregister(&sch311x_gpio_driver);
417 return err;
418}
419
420static void __exit sch311x_gpio_exit(void)
421{
422 platform_device_unregister(sch311x_gpio_pdev);
423 platform_driver_unregister(&sch311x_gpio_driver);
424}
425
426module_init(sch311x_gpio_init);
427module_exit(sch311x_gpio_exit);
428
429MODULE_AUTHOR("Bruno Randolf <br1@einfach.org>");
430MODULE_DESCRIPTION("SMSC SCH311x GPIO Driver");
431MODULE_LICENSE("GPL");
432MODULE_ALIAS("platform:gpio-sch311x");
1/*
2 * GPIO driver for the SMSC SCH311x Super-I/O chips
3 *
4 * Copyright (C) 2013 Bruno Randolf <br1@einfach.org>
5 *
6 * SuperIO functions and chip detection:
7 * (c) Copyright 2008 Wim Van Sebroeck <wim@iguana.be>.
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 */
14
15#include <linux/ioport.h>
16#include <linux/module.h>
17#include <linux/kernel.h>
18#include <linux/init.h>
19#include <linux/platform_device.h>
20#include <linux/gpio.h>
21#include <linux/bitops.h>
22#include <linux/io.h>
23
24#define DRV_NAME "gpio-sch311x"
25
26#define SCH311X_GPIO_CONF_OUT 0x00
27#define SCH311X_GPIO_CONF_IN 0x01
28#define SCH311X_GPIO_CONF_INVERT 0x02
29#define SCH311X_GPIO_CONF_OPEN_DRAIN 0x80
30
31#define SIO_CONFIG_KEY_ENTER 0x55
32#define SIO_CONFIG_KEY_EXIT 0xaa
33
34#define GP1 0x4b
35
36static int sch311x_ioports[] = { 0x2e, 0x4e, 0x162e, 0x164e };
37
38static struct platform_device *sch311x_gpio_pdev;
39
40struct sch311x_pdev_data { /* platform device data */
41 unsigned short runtime_reg; /* runtime register base address */
42};
43
44struct sch311x_gpio_block { /* one GPIO block runtime data */
45 struct gpio_chip chip;
46 unsigned short data_reg; /* from definition below */
47 unsigned short *config_regs; /* pointer to definition below */
48 unsigned short runtime_reg; /* runtime register */
49 spinlock_t lock; /* lock for this GPIO block */
50};
51
52struct sch311x_gpio_priv { /* driver private data */
53 struct sch311x_gpio_block blocks[6];
54};
55
56struct sch311x_gpio_block_def { /* register address definitions */
57 unsigned short data_reg;
58 unsigned short config_regs[8];
59 unsigned short base;
60};
61
62/* Note: some GPIOs are not available, these are marked with 0x00 */
63
64static struct sch311x_gpio_block_def sch311x_gpio_blocks[] = {
65 {
66 .data_reg = 0x4b, /* GP1 */
67 .config_regs = {0x23, 0x24, 0x25, 0x26, 0x27, 0x29, 0x2a, 0x2b},
68 .base = 10,
69 },
70 {
71 .data_reg = 0x4c, /* GP2 */
72 .config_regs = {0x00, 0x2c, 0x2d, 0x00, 0x00, 0x00, 0x00, 0x32},
73 .base = 20,
74 },
75 {
76 .data_reg = 0x4d, /* GP3 */
77 .config_regs = {0x33, 0x34, 0x35, 0x36, 0x37, 0x00, 0x39, 0x3a},
78 .base = 30,
79 },
80 {
81 .data_reg = 0x4e, /* GP4 */
82 .config_regs = {0x3b, 0x00, 0x3d, 0x00, 0x6e, 0x6f, 0x72, 0x73},
83 .base = 40,
84 },
85 {
86 .data_reg = 0x4f, /* GP5 */
87 .config_regs = {0x3f, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46},
88 .base = 50,
89 },
90 {
91 .data_reg = 0x50, /* GP6 */
92 .config_regs = {0x47, 0x48, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59},
93 .base = 60,
94 },
95};
96
97/*
98 * Super-IO functions
99 */
100
101static inline int sch311x_sio_enter(int sio_config_port)
102{
103 /* Don't step on other drivers' I/O space by accident. */
104 if (!request_muxed_region(sio_config_port, 2, DRV_NAME)) {
105 pr_err(DRV_NAME "I/O address 0x%04x already in use\n",
106 sio_config_port);
107 return -EBUSY;
108 }
109
110 outb(SIO_CONFIG_KEY_ENTER, sio_config_port);
111 return 0;
112}
113
114static inline void sch311x_sio_exit(int sio_config_port)
115{
116 outb(SIO_CONFIG_KEY_EXIT, sio_config_port);
117 release_region(sio_config_port, 2);
118}
119
120static inline int sch311x_sio_inb(int sio_config_port, int reg)
121{
122 outb(reg, sio_config_port);
123 return inb(sio_config_port + 1);
124}
125
126static inline void sch311x_sio_outb(int sio_config_port, int reg, int val)
127{
128 outb(reg, sio_config_port);
129 outb(val, sio_config_port + 1);
130}
131
132
133/*
134 * GPIO functions
135 */
136
137static int sch311x_gpio_request(struct gpio_chip *chip, unsigned offset)
138{
139 struct sch311x_gpio_block *block = gpiochip_get_data(chip);
140
141 if (block->config_regs[offset] == 0) /* GPIO is not available */
142 return -ENODEV;
143
144 if (!request_region(block->runtime_reg + block->config_regs[offset],
145 1, DRV_NAME)) {
146 dev_err(chip->parent, "Failed to request region 0x%04x.\n",
147 block->runtime_reg + block->config_regs[offset]);
148 return -EBUSY;
149 }
150 return 0;
151}
152
153static void sch311x_gpio_free(struct gpio_chip *chip, unsigned offset)
154{
155 struct sch311x_gpio_block *block = gpiochip_get_data(chip);
156
157 if (block->config_regs[offset] == 0) /* GPIO is not available */
158 return;
159
160 release_region(block->runtime_reg + block->config_regs[offset], 1);
161}
162
163static int sch311x_gpio_get(struct gpio_chip *chip, unsigned offset)
164{
165 struct sch311x_gpio_block *block = gpiochip_get_data(chip);
166 unsigned char data;
167
168 spin_lock(&block->lock);
169 data = inb(block->runtime_reg + block->data_reg);
170 spin_unlock(&block->lock);
171
172 return !!(data & BIT(offset));
173}
174
175static void __sch311x_gpio_set(struct sch311x_gpio_block *block,
176 unsigned offset, int value)
177{
178 unsigned char data = inb(block->runtime_reg + block->data_reg);
179 if (value)
180 data |= BIT(offset);
181 else
182 data &= ~BIT(offset);
183 outb(data, block->runtime_reg + block->data_reg);
184}
185
186static void sch311x_gpio_set(struct gpio_chip *chip, unsigned offset,
187 int value)
188{
189 struct sch311x_gpio_block *block = gpiochip_get_data(chip);
190
191 spin_lock(&block->lock);
192 __sch311x_gpio_set(block, offset, value);
193 spin_unlock(&block->lock);
194}
195
196static int sch311x_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
197{
198 struct sch311x_gpio_block *block = gpiochip_get_data(chip);
199
200 spin_lock(&block->lock);
201 outb(SCH311X_GPIO_CONF_IN, block->runtime_reg +
202 block->config_regs[offset]);
203 spin_unlock(&block->lock);
204
205 return 0;
206}
207
208static int sch311x_gpio_direction_out(struct gpio_chip *chip, unsigned offset,
209 int value)
210{
211 struct sch311x_gpio_block *block = gpiochip_get_data(chip);
212
213 spin_lock(&block->lock);
214
215 outb(SCH311X_GPIO_CONF_OUT, block->runtime_reg +
216 block->config_regs[offset]);
217
218 __sch311x_gpio_set(block, offset, value);
219
220 spin_unlock(&block->lock);
221 return 0;
222}
223
224static int sch311x_gpio_probe(struct platform_device *pdev)
225{
226 struct sch311x_pdev_data *pdata = dev_get_platdata(&pdev->dev);
227 struct sch311x_gpio_priv *priv;
228 struct sch311x_gpio_block *block;
229 int err, i;
230
231 /* we can register all GPIO data registers at once */
232 if (!devm_request_region(&pdev->dev, pdata->runtime_reg + GP1, 6,
233 DRV_NAME)) {
234 dev_err(&pdev->dev, "Failed to request region 0x%04x-0x%04x.\n",
235 pdata->runtime_reg + GP1, pdata->runtime_reg + GP1 + 5);
236 return -EBUSY;
237 }
238
239 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
240 if (!priv)
241 return -ENOMEM;
242
243 platform_set_drvdata(pdev, priv);
244
245 for (i = 0; i < ARRAY_SIZE(priv->blocks); i++) {
246 block = &priv->blocks[i];
247
248 spin_lock_init(&block->lock);
249
250 block->chip.label = DRV_NAME;
251 block->chip.owner = THIS_MODULE;
252 block->chip.request = sch311x_gpio_request;
253 block->chip.free = sch311x_gpio_free;
254 block->chip.direction_input = sch311x_gpio_direction_in;
255 block->chip.direction_output = sch311x_gpio_direction_out;
256 block->chip.get = sch311x_gpio_get;
257 block->chip.set = sch311x_gpio_set;
258 block->chip.ngpio = 8;
259 block->chip.parent = &pdev->dev;
260 block->chip.base = sch311x_gpio_blocks[i].base;
261 block->config_regs = sch311x_gpio_blocks[i].config_regs;
262 block->data_reg = sch311x_gpio_blocks[i].data_reg;
263 block->runtime_reg = pdata->runtime_reg;
264
265 err = gpiochip_add_data(&block->chip, block);
266 if (err < 0) {
267 dev_err(&pdev->dev,
268 "Could not register gpiochip, %d\n", err);
269 goto exit_err;
270 }
271 dev_info(&pdev->dev,
272 "SMSC SCH311x GPIO block %d registered.\n", i);
273 }
274
275 return 0;
276
277exit_err:
278 /* release already registered chips */
279 for (--i; i >= 0; i--)
280 gpiochip_remove(&priv->blocks[i].chip);
281 return err;
282}
283
284static int sch311x_gpio_remove(struct platform_device *pdev)
285{
286 struct sch311x_gpio_priv *priv = platform_get_drvdata(pdev);
287 int i;
288
289 for (i = 0; i < ARRAY_SIZE(priv->blocks); i++) {
290 gpiochip_remove(&priv->blocks[i].chip);
291 dev_info(&pdev->dev,
292 "SMSC SCH311x GPIO block %d unregistered.\n", i);
293 }
294 return 0;
295}
296
297static struct platform_driver sch311x_gpio_driver = {
298 .driver.name = DRV_NAME,
299 .driver.owner = THIS_MODULE,
300 .probe = sch311x_gpio_probe,
301 .remove = sch311x_gpio_remove,
302};
303
304
305/*
306 * Init & exit routines
307 */
308
309static int __init sch311x_detect(int sio_config_port, unsigned short *addr)
310{
311 int err = 0, reg;
312 unsigned short base_addr;
313 unsigned char dev_id;
314
315 err = sch311x_sio_enter(sio_config_port);
316 if (err)
317 return err;
318
319 /* Check device ID. */
320 reg = sch311x_sio_inb(sio_config_port, 0x20);
321 switch (reg) {
322 case 0x7c: /* SCH3112 */
323 dev_id = 2;
324 break;
325 case 0x7d: /* SCH3114 */
326 dev_id = 4;
327 break;
328 case 0x7f: /* SCH3116 */
329 dev_id = 6;
330 break;
331 default:
332 err = -ENODEV;
333 goto exit;
334 }
335
336 /* Select logical device A (runtime registers) */
337 sch311x_sio_outb(sio_config_port, 0x07, 0x0a);
338
339 /* Check if Logical Device Register is currently active */
340 if ((sch311x_sio_inb(sio_config_port, 0x30) & 0x01) == 0)
341 pr_info("Seems that LDN 0x0a is not active...\n");
342
343 /* Get the base address of the runtime registers */
344 base_addr = (sch311x_sio_inb(sio_config_port, 0x60) << 8) |
345 sch311x_sio_inb(sio_config_port, 0x61);
346 if (!base_addr) {
347 pr_err("Base address not set\n");
348 err = -ENODEV;
349 goto exit;
350 }
351 *addr = base_addr;
352
353 pr_info("Found an SMSC SCH311%d chip at 0x%04x\n", dev_id, base_addr);
354
355exit:
356 sch311x_sio_exit(sio_config_port);
357 return err;
358}
359
360static int __init sch311x_gpio_pdev_add(const unsigned short addr)
361{
362 struct sch311x_pdev_data pdata;
363 int err;
364
365 pdata.runtime_reg = addr;
366
367 sch311x_gpio_pdev = platform_device_alloc(DRV_NAME, -1);
368 if (!sch311x_gpio_pdev)
369 return -ENOMEM;
370
371 err = platform_device_add_data(sch311x_gpio_pdev,
372 &pdata, sizeof(pdata));
373 if (err) {
374 pr_err(DRV_NAME "Platform data allocation failed\n");
375 goto err;
376 }
377
378 err = platform_device_add(sch311x_gpio_pdev);
379 if (err) {
380 pr_err(DRV_NAME "Device addition failed\n");
381 goto err;
382 }
383 return 0;
384
385err:
386 platform_device_put(sch311x_gpio_pdev);
387 return err;
388}
389
390static int __init sch311x_gpio_init(void)
391{
392 int err, i;
393 unsigned short addr = 0;
394
395 for (i = 0; i < ARRAY_SIZE(sch311x_ioports); i++)
396 if (sch311x_detect(sch311x_ioports[i], &addr) == 0)
397 break;
398
399 if (!addr)
400 return -ENODEV;
401
402 err = platform_driver_register(&sch311x_gpio_driver);
403 if (err)
404 return err;
405
406 err = sch311x_gpio_pdev_add(addr);
407 if (err)
408 goto unreg_platform_driver;
409
410 return 0;
411
412unreg_platform_driver:
413 platform_driver_unregister(&sch311x_gpio_driver);
414 return err;
415}
416
417static void __exit sch311x_gpio_exit(void)
418{
419 platform_device_unregister(sch311x_gpio_pdev);
420 platform_driver_unregister(&sch311x_gpio_driver);
421}
422
423module_init(sch311x_gpio_init);
424module_exit(sch311x_gpio_exit);
425
426MODULE_AUTHOR("Bruno Randolf <br1@einfach.org>");
427MODULE_DESCRIPTION("SMSC SCH311x GPIO Driver");
428MODULE_LICENSE("GPL");
429MODULE_ALIAS("platform:gpio-sch311x");