]>
Commit | Line | Data |
---|---|---|
9e60fdcf | 1 | /* |
f5e8ff48 | 2 | * pca953x.c - 4/8/16 bit I/O ports |
9e60fdcf | 3 | * |
4 | * Copyright (C) 2005 Ben Gardner <bgardner@wabtec.com> | |
5 | * Copyright (C) 2007 Marvell International Ltd. | |
6 | * | |
7 | * Derived from drivers/i2c/chips/pca9539.c | |
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; version 2 of the License. | |
12 | */ | |
13 | ||
14 | #include <linux/module.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/i2c.h> | |
d1c057e3 | 17 | #include <linux/i2c/pca953x.h> |
1965d303 NC |
18 | #ifdef CONFIG_OF_GPIO |
19 | #include <linux/of_platform.h> | |
20 | #include <linux/of_gpio.h> | |
21 | #endif | |
9e60fdcf | 22 | |
23 | #include <asm/gpio.h> | |
24 | ||
f5e8ff48 GL |
25 | #define PCA953X_INPUT 0 |
26 | #define PCA953X_OUTPUT 1 | |
27 | #define PCA953X_INVERT 2 | |
28 | #define PCA953X_DIRECTION 3 | |
9e60fdcf | 29 | |
3760f736 | 30 | static const struct i2c_device_id pca953x_id[] = { |
f5e8ff48 GL |
31 | { "pca9534", 8, }, |
32 | { "pca9535", 16, }, | |
33 | { "pca9536", 4, }, | |
34 | { "pca9537", 4, }, | |
35 | { "pca9538", 8, }, | |
36 | { "pca9539", 16, }, | |
69292b34 | 37 | { "pca9554", 8, }, |
f39e5781 | 38 | { "pca9555", 16, }, |
10dfb54c | 39 | { "pca9556", 8, }, |
f39e5781 | 40 | { "pca9557", 8, }, |
ab5dc372 | 41 | |
7059d4b0 | 42 | { "max7310", 8, }, |
61e0671c | 43 | { "max7315", 8, }, |
ab5dc372 DB |
44 | { "pca6107", 8, }, |
45 | { "tca6408", 8, }, | |
46 | { "tca6416", 16, }, | |
47 | /* NYET: { "tca6424", 24, }, */ | |
3760f736 | 48 | { } |
f5e8ff48 | 49 | }; |
3760f736 | 50 | MODULE_DEVICE_TABLE(i2c, pca953x_id); |
9e60fdcf | 51 | |
f3dc3630 | 52 | struct pca953x_chip { |
9e60fdcf | 53 | unsigned gpio_start; |
54 | uint16_t reg_output; | |
55 | uint16_t reg_direction; | |
56 | ||
57 | struct i2c_client *client; | |
1965d303 | 58 | struct pca953x_platform_data *dyn_pdata; |
9e60fdcf | 59 | struct gpio_chip gpio_chip; |
77906a54 | 60 | char **names; |
9e60fdcf | 61 | }; |
62 | ||
f3dc3630 | 63 | static int pca953x_write_reg(struct pca953x_chip *chip, int reg, uint16_t val) |
9e60fdcf | 64 | { |
f5e8ff48 GL |
65 | int ret; |
66 | ||
67 | if (chip->gpio_chip.ngpio <= 8) | |
68 | ret = i2c_smbus_write_byte_data(chip->client, reg, val); | |
9e60fdcf | 69 | else |
f5e8ff48 GL |
70 | ret = i2c_smbus_write_word_data(chip->client, reg << 1, val); |
71 | ||
72 | if (ret < 0) { | |
73 | dev_err(&chip->client->dev, "failed writing register\n"); | |
ab5dc372 | 74 | return ret; |
f5e8ff48 GL |
75 | } |
76 | ||
77 | return 0; | |
9e60fdcf | 78 | } |
79 | ||
f3dc3630 | 80 | static int pca953x_read_reg(struct pca953x_chip *chip, int reg, uint16_t *val) |
9e60fdcf | 81 | { |
82 | int ret; | |
83 | ||
f5e8ff48 GL |
84 | if (chip->gpio_chip.ngpio <= 8) |
85 | ret = i2c_smbus_read_byte_data(chip->client, reg); | |
86 | else | |
87 | ret = i2c_smbus_read_word_data(chip->client, reg << 1); | |
88 | ||
9e60fdcf | 89 | if (ret < 0) { |
90 | dev_err(&chip->client->dev, "failed reading register\n"); | |
ab5dc372 | 91 | return ret; |
9e60fdcf | 92 | } |
93 | ||
94 | *val = (uint16_t)ret; | |
95 | return 0; | |
96 | } | |
97 | ||
f3dc3630 | 98 | static int pca953x_gpio_direction_input(struct gpio_chip *gc, unsigned off) |
9e60fdcf | 99 | { |
f3dc3630 | 100 | struct pca953x_chip *chip; |
9e60fdcf | 101 | uint16_t reg_val; |
102 | int ret; | |
103 | ||
f3dc3630 | 104 | chip = container_of(gc, struct pca953x_chip, gpio_chip); |
9e60fdcf | 105 | |
106 | reg_val = chip->reg_direction | (1u << off); | |
f3dc3630 | 107 | ret = pca953x_write_reg(chip, PCA953X_DIRECTION, reg_val); |
9e60fdcf | 108 | if (ret) |
109 | return ret; | |
110 | ||
111 | chip->reg_direction = reg_val; | |
112 | return 0; | |
113 | } | |
114 | ||
f3dc3630 | 115 | static int pca953x_gpio_direction_output(struct gpio_chip *gc, |
9e60fdcf | 116 | unsigned off, int val) |
117 | { | |
f3dc3630 | 118 | struct pca953x_chip *chip; |
9e60fdcf | 119 | uint16_t reg_val; |
120 | int ret; | |
121 | ||
f3dc3630 | 122 | chip = container_of(gc, struct pca953x_chip, gpio_chip); |
9e60fdcf | 123 | |
124 | /* set output level */ | |
125 | if (val) | |
126 | reg_val = chip->reg_output | (1u << off); | |
127 | else | |
128 | reg_val = chip->reg_output & ~(1u << off); | |
129 | ||
f3dc3630 | 130 | ret = pca953x_write_reg(chip, PCA953X_OUTPUT, reg_val); |
9e60fdcf | 131 | if (ret) |
132 | return ret; | |
133 | ||
134 | chip->reg_output = reg_val; | |
135 | ||
136 | /* then direction */ | |
137 | reg_val = chip->reg_direction & ~(1u << off); | |
f3dc3630 | 138 | ret = pca953x_write_reg(chip, PCA953X_DIRECTION, reg_val); |
9e60fdcf | 139 | if (ret) |
140 | return ret; | |
141 | ||
142 | chip->reg_direction = reg_val; | |
143 | return 0; | |
144 | } | |
145 | ||
f3dc3630 | 146 | static int pca953x_gpio_get_value(struct gpio_chip *gc, unsigned off) |
9e60fdcf | 147 | { |
f3dc3630 | 148 | struct pca953x_chip *chip; |
9e60fdcf | 149 | uint16_t reg_val; |
150 | int ret; | |
151 | ||
f3dc3630 | 152 | chip = container_of(gc, struct pca953x_chip, gpio_chip); |
9e60fdcf | 153 | |
f3dc3630 | 154 | ret = pca953x_read_reg(chip, PCA953X_INPUT, ®_val); |
9e60fdcf | 155 | if (ret < 0) { |
156 | /* NOTE: diagnostic already emitted; that's all we should | |
157 | * do unless gpio_*_value_cansleep() calls become different | |
158 | * from their nonsleeping siblings (and report faults). | |
159 | */ | |
160 | return 0; | |
161 | } | |
162 | ||
163 | return (reg_val & (1u << off)) ? 1 : 0; | |
164 | } | |
165 | ||
f3dc3630 | 166 | static void pca953x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val) |
9e60fdcf | 167 | { |
f3dc3630 | 168 | struct pca953x_chip *chip; |
9e60fdcf | 169 | uint16_t reg_val; |
170 | int ret; | |
171 | ||
f3dc3630 | 172 | chip = container_of(gc, struct pca953x_chip, gpio_chip); |
9e60fdcf | 173 | |
174 | if (val) | |
175 | reg_val = chip->reg_output | (1u << off); | |
176 | else | |
177 | reg_val = chip->reg_output & ~(1u << off); | |
178 | ||
f3dc3630 | 179 | ret = pca953x_write_reg(chip, PCA953X_OUTPUT, reg_val); |
9e60fdcf | 180 | if (ret) |
181 | return; | |
182 | ||
183 | chip->reg_output = reg_val; | |
184 | } | |
185 | ||
f5e8ff48 | 186 | static void pca953x_setup_gpio(struct pca953x_chip *chip, int gpios) |
9e60fdcf | 187 | { |
188 | struct gpio_chip *gc; | |
189 | ||
190 | gc = &chip->gpio_chip; | |
191 | ||
f3dc3630 GL |
192 | gc->direction_input = pca953x_gpio_direction_input; |
193 | gc->direction_output = pca953x_gpio_direction_output; | |
194 | gc->get = pca953x_gpio_get_value; | |
195 | gc->set = pca953x_gpio_set_value; | |
84207805 | 196 | gc->can_sleep = 1; |
9e60fdcf | 197 | |
198 | gc->base = chip->gpio_start; | |
f5e8ff48 GL |
199 | gc->ngpio = gpios; |
200 | gc->label = chip->client->name; | |
d8f388d8 | 201 | gc->dev = &chip->client->dev; |
d72cbed0 | 202 | gc->owner = THIS_MODULE; |
77906a54 | 203 | gc->names = chip->names; |
9e60fdcf | 204 | } |
205 | ||
1965d303 NC |
206 | /* |
207 | * Handlers for alternative sources of platform_data | |
208 | */ | |
209 | #ifdef CONFIG_OF_GPIO | |
210 | /* | |
211 | * Translate OpenFirmware node properties into platform_data | |
212 | */ | |
213 | static struct pca953x_platform_data * | |
214 | pca953x_get_alt_pdata(struct i2c_client *client) | |
215 | { | |
216 | struct pca953x_platform_data *pdata; | |
217 | struct device_node *node; | |
218 | const uint16_t *val; | |
219 | ||
220 | node = dev_archdata_get_node(&client->dev.archdata); | |
221 | if (node == NULL) | |
222 | return NULL; | |
223 | ||
224 | pdata = kzalloc(sizeof(struct pca953x_platform_data), GFP_KERNEL); | |
225 | if (pdata == NULL) { | |
226 | dev_err(&client->dev, "Unable to allocate platform_data\n"); | |
227 | return NULL; | |
228 | } | |
229 | ||
230 | pdata->gpio_base = -1; | |
231 | val = of_get_property(node, "linux,gpio-base", NULL); | |
232 | if (val) { | |
233 | if (*val < 0) | |
234 | dev_warn(&client->dev, | |
235 | "invalid gpio-base in device tree\n"); | |
236 | else | |
237 | pdata->gpio_base = *val; | |
238 | } | |
239 | ||
240 | val = of_get_property(node, "polarity", NULL); | |
241 | if (val) | |
242 | pdata->invert = *val; | |
243 | ||
244 | return pdata; | |
245 | } | |
246 | #else | |
247 | static struct pca953x_platform_data * | |
248 | pca953x_get_alt_pdata(struct i2c_client *client) | |
249 | { | |
250 | return NULL; | |
251 | } | |
252 | #endif | |
253 | ||
d2653e92 | 254 | static int __devinit pca953x_probe(struct i2c_client *client, |
3760f736 | 255 | const struct i2c_device_id *id) |
9e60fdcf | 256 | { |
f3dc3630 GL |
257 | struct pca953x_platform_data *pdata; |
258 | struct pca953x_chip *chip; | |
f39e5781 | 259 | int ret; |
9e60fdcf | 260 | |
1965d303 NC |
261 | chip = kzalloc(sizeof(struct pca953x_chip), GFP_KERNEL); |
262 | if (chip == NULL) | |
263 | return -ENOMEM; | |
264 | ||
9e60fdcf | 265 | pdata = client->dev.platform_data; |
a342d215 | 266 | if (pdata == NULL) { |
1965d303 NC |
267 | pdata = pca953x_get_alt_pdata(client); |
268 | /* | |
269 | * Unlike normal platform_data, this is allocated | |
270 | * dynamically and must be freed in the driver | |
271 | */ | |
272 | chip->dyn_pdata = pdata; | |
a342d215 | 273 | } |
9e60fdcf | 274 | |
1965d303 NC |
275 | if (pdata == NULL) { |
276 | dev_dbg(&client->dev, "no platform data\n"); | |
277 | ret = -EINVAL; | |
278 | goto out_failed; | |
279 | } | |
9e60fdcf | 280 | |
281 | chip->client = client; | |
282 | ||
283 | chip->gpio_start = pdata->gpio_base; | |
284 | ||
77906a54 DS |
285 | chip->names = pdata->names; |
286 | ||
9e60fdcf | 287 | /* initialize cached registers from their original values. |
288 | * we can't share this chip with another i2c master. | |
289 | */ | |
f5e8ff48 GL |
290 | pca953x_setup_gpio(chip, id->driver_data); |
291 | ||
f3dc3630 | 292 | ret = pca953x_read_reg(chip, PCA953X_OUTPUT, &chip->reg_output); |
9e60fdcf | 293 | if (ret) |
294 | goto out_failed; | |
295 | ||
f3dc3630 | 296 | ret = pca953x_read_reg(chip, PCA953X_DIRECTION, &chip->reg_direction); |
9e60fdcf | 297 | if (ret) |
298 | goto out_failed; | |
299 | ||
300 | /* set platform specific polarity inversion */ | |
f3dc3630 | 301 | ret = pca953x_write_reg(chip, PCA953X_INVERT, pdata->invert); |
9e60fdcf | 302 | if (ret) |
303 | goto out_failed; | |
304 | ||
f5e8ff48 GL |
305 | |
306 | ret = gpiochip_add(&chip->gpio_chip); | |
9e60fdcf | 307 | if (ret) |
308 | goto out_failed; | |
309 | ||
310 | if (pdata->setup) { | |
311 | ret = pdata->setup(client, chip->gpio_chip.base, | |
312 | chip->gpio_chip.ngpio, pdata->context); | |
313 | if (ret < 0) | |
314 | dev_warn(&client->dev, "setup failed, %d\n", ret); | |
315 | } | |
316 | ||
317 | i2c_set_clientdata(client, chip); | |
318 | return 0; | |
319 | ||
320 | out_failed: | |
1965d303 | 321 | kfree(chip->dyn_pdata); |
9e60fdcf | 322 | kfree(chip); |
323 | return ret; | |
324 | } | |
325 | ||
f3dc3630 | 326 | static int pca953x_remove(struct i2c_client *client) |
9e60fdcf | 327 | { |
f3dc3630 GL |
328 | struct pca953x_platform_data *pdata = client->dev.platform_data; |
329 | struct pca953x_chip *chip = i2c_get_clientdata(client); | |
9e60fdcf | 330 | int ret = 0; |
331 | ||
332 | if (pdata->teardown) { | |
333 | ret = pdata->teardown(client, chip->gpio_chip.base, | |
334 | chip->gpio_chip.ngpio, pdata->context); | |
335 | if (ret < 0) { | |
336 | dev_err(&client->dev, "%s failed, %d\n", | |
337 | "teardown", ret); | |
338 | return ret; | |
339 | } | |
340 | } | |
341 | ||
342 | ret = gpiochip_remove(&chip->gpio_chip); | |
343 | if (ret) { | |
344 | dev_err(&client->dev, "%s failed, %d\n", | |
345 | "gpiochip_remove()", ret); | |
346 | return ret; | |
347 | } | |
348 | ||
1965d303 | 349 | kfree(chip->dyn_pdata); |
9e60fdcf | 350 | kfree(chip); |
351 | return 0; | |
352 | } | |
353 | ||
f3dc3630 | 354 | static struct i2c_driver pca953x_driver = { |
9e60fdcf | 355 | .driver = { |
f3dc3630 | 356 | .name = "pca953x", |
9e60fdcf | 357 | }, |
f3dc3630 GL |
358 | .probe = pca953x_probe, |
359 | .remove = pca953x_remove, | |
3760f736 | 360 | .id_table = pca953x_id, |
9e60fdcf | 361 | }; |
362 | ||
f3dc3630 | 363 | static int __init pca953x_init(void) |
9e60fdcf | 364 | { |
f3dc3630 | 365 | return i2c_add_driver(&pca953x_driver); |
9e60fdcf | 366 | } |
2f8d1197 DB |
367 | /* register after i2c postcore initcall and before |
368 | * subsys initcalls that may rely on these GPIOs | |
369 | */ | |
370 | subsys_initcall(pca953x_init); | |
9e60fdcf | 371 | |
f3dc3630 | 372 | static void __exit pca953x_exit(void) |
9e60fdcf | 373 | { |
f3dc3630 | 374 | i2c_del_driver(&pca953x_driver); |
9e60fdcf | 375 | } |
f3dc3630 | 376 | module_exit(pca953x_exit); |
9e60fdcf | 377 | |
378 | MODULE_AUTHOR("eric miao <eric.miao@marvell.com>"); | |
f3dc3630 | 379 | MODULE_DESCRIPTION("GPIO expander driver for PCA953x"); |
9e60fdcf | 380 | MODULE_LICENSE("GPL"); |