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c6c19332 MR |
1 | /* |
2 | * Core driver for TI TPS6586x PMIC family | |
3 | * | |
4 | * Copyright (c) 2010 CompuLab Ltd. | |
5 | * Mike Rapoport <mike@compulab.co.il> | |
6 | * | |
7 | * Based on da903x.c. | |
8 | * Copyright (C) 2008 Compulab, Ltd. | |
9 | * Mike Rapoport <mike@compulab.co.il> | |
10 | * Copyright (C) 2006-2008 Marvell International Ltd. | |
11 | * Eric Miao <eric.miao@marvell.com> | |
12 | * | |
13 | * This program is free software; you can redistribute it and/or modify | |
14 | * it under the terms of the GNU General Public License version 2 as | |
15 | * published by the Free Software Foundation. | |
16 | */ | |
17 | ||
18 | #include <linux/kernel.h> | |
19 | #include <linux/module.h> | |
20 | #include <linux/mutex.h> | |
21 | #include <linux/slab.h> | |
22 | #include <linux/gpio.h> | |
23 | #include <linux/i2c.h> | |
24 | ||
25 | #include <linux/mfd/core.h> | |
26 | #include <linux/mfd/tps6586x.h> | |
27 | ||
28 | /* GPIO control registers */ | |
29 | #define TPS6586X_GPIOSET1 0x5d | |
30 | #define TPS6586X_GPIOSET2 0x5e | |
31 | ||
32 | /* device id */ | |
33 | #define TPS6586X_VERSIONCRC 0xcd | |
34 | #define TPS658621A_VERSIONCRC 0x15 | |
35 | ||
36 | struct tps6586x { | |
37 | struct mutex lock; | |
38 | struct device *dev; | |
39 | struct i2c_client *client; | |
40 | ||
41 | struct gpio_chip gpio; | |
42 | }; | |
43 | ||
44 | static inline int __tps6586x_read(struct i2c_client *client, | |
45 | int reg, uint8_t *val) | |
46 | { | |
47 | int ret; | |
48 | ||
49 | ret = i2c_smbus_read_byte_data(client, reg); | |
50 | if (ret < 0) { | |
51 | dev_err(&client->dev, "failed reading at 0x%02x\n", reg); | |
52 | return ret; | |
53 | } | |
54 | ||
55 | *val = (uint8_t)ret; | |
56 | ||
57 | return 0; | |
58 | } | |
59 | ||
60 | static inline int __tps6586x_reads(struct i2c_client *client, int reg, | |
61 | int len, uint8_t *val) | |
62 | { | |
63 | int ret; | |
64 | ||
65 | ret = i2c_smbus_read_i2c_block_data(client, reg, len, val); | |
66 | if (ret < 0) { | |
67 | dev_err(&client->dev, "failed reading from 0x%02x\n", reg); | |
68 | return ret; | |
69 | } | |
70 | ||
71 | return 0; | |
72 | } | |
73 | ||
74 | static inline int __tps6586x_write(struct i2c_client *client, | |
75 | int reg, uint8_t val) | |
76 | { | |
77 | int ret; | |
78 | ||
79 | ret = i2c_smbus_write_byte_data(client, reg, val); | |
80 | if (ret < 0) { | |
81 | dev_err(&client->dev, "failed writing 0x%02x to 0x%02x\n", | |
82 | val, reg); | |
83 | return ret; | |
84 | } | |
85 | ||
86 | return 0; | |
87 | } | |
88 | ||
89 | static inline int __tps6586x_writes(struct i2c_client *client, int reg, | |
90 | int len, uint8_t *val) | |
91 | { | |
92 | int ret; | |
93 | ||
94 | ret = i2c_smbus_write_i2c_block_data(client, reg, len, val); | |
95 | if (ret < 0) { | |
96 | dev_err(&client->dev, "failed writings to 0x%02x\n", reg); | |
97 | return ret; | |
98 | } | |
99 | ||
100 | return 0; | |
101 | } | |
102 | ||
103 | int tps6586x_write(struct device *dev, int reg, uint8_t val) | |
104 | { | |
105 | return __tps6586x_write(to_i2c_client(dev), reg, val); | |
106 | } | |
107 | EXPORT_SYMBOL_GPL(tps6586x_write); | |
108 | ||
109 | int tps6586x_writes(struct device *dev, int reg, int len, uint8_t *val) | |
110 | { | |
111 | return __tps6586x_writes(to_i2c_client(dev), reg, len, val); | |
112 | } | |
113 | EXPORT_SYMBOL_GPL(tps6586x_writes); | |
114 | ||
115 | int tps6586x_read(struct device *dev, int reg, uint8_t *val) | |
116 | { | |
117 | return __tps6586x_read(to_i2c_client(dev), reg, val); | |
118 | } | |
119 | EXPORT_SYMBOL_GPL(tps6586x_read); | |
120 | ||
121 | int tps6586x_reads(struct device *dev, int reg, int len, uint8_t *val) | |
122 | { | |
123 | return __tps6586x_reads(to_i2c_client(dev), reg, len, val); | |
124 | } | |
125 | EXPORT_SYMBOL_GPL(tps6586x_reads); | |
126 | ||
127 | int tps6586x_set_bits(struct device *dev, int reg, uint8_t bit_mask) | |
128 | { | |
129 | struct tps6586x *tps6586x = dev_get_drvdata(dev); | |
130 | uint8_t reg_val; | |
131 | int ret = 0; | |
132 | ||
133 | mutex_lock(&tps6586x->lock); | |
134 | ||
135 | ret = __tps6586x_read(to_i2c_client(dev), reg, ®_val); | |
136 | if (ret) | |
137 | goto out; | |
138 | ||
139 | if ((reg_val & bit_mask) == 0) { | |
140 | reg_val |= bit_mask; | |
141 | ret = __tps6586x_write(to_i2c_client(dev), reg, reg_val); | |
142 | } | |
143 | out: | |
144 | mutex_unlock(&tps6586x->lock); | |
145 | return ret; | |
146 | } | |
147 | EXPORT_SYMBOL_GPL(tps6586x_set_bits); | |
148 | ||
149 | int tps6586x_clr_bits(struct device *dev, int reg, uint8_t bit_mask) | |
150 | { | |
151 | struct tps6586x *tps6586x = dev_get_drvdata(dev); | |
152 | uint8_t reg_val; | |
153 | int ret = 0; | |
154 | ||
155 | mutex_lock(&tps6586x->lock); | |
156 | ||
157 | ret = __tps6586x_read(to_i2c_client(dev), reg, ®_val); | |
158 | if (ret) | |
159 | goto out; | |
160 | ||
161 | if (reg_val & bit_mask) { | |
162 | reg_val &= ~bit_mask; | |
163 | ret = __tps6586x_write(to_i2c_client(dev), reg, reg_val); | |
164 | } | |
165 | out: | |
166 | mutex_unlock(&tps6586x->lock); | |
167 | return ret; | |
168 | } | |
169 | EXPORT_SYMBOL_GPL(tps6586x_clr_bits); | |
170 | ||
171 | int tps6586x_update(struct device *dev, int reg, uint8_t val, uint8_t mask) | |
172 | { | |
173 | struct tps6586x *tps6586x = dev_get_drvdata(dev); | |
174 | uint8_t reg_val; | |
175 | int ret = 0; | |
176 | ||
177 | mutex_lock(&tps6586x->lock); | |
178 | ||
179 | ret = __tps6586x_read(tps6586x->client, reg, ®_val); | |
180 | if (ret) | |
181 | goto out; | |
182 | ||
183 | if ((reg_val & mask) != val) { | |
184 | reg_val = (reg_val & ~mask) | val; | |
185 | ret = __tps6586x_write(tps6586x->client, reg, reg_val); | |
186 | } | |
187 | out: | |
188 | mutex_unlock(&tps6586x->lock); | |
189 | return ret; | |
190 | } | |
191 | EXPORT_SYMBOL_GPL(tps6586x_update); | |
192 | ||
193 | static int tps6586x_gpio_get(struct gpio_chip *gc, unsigned offset) | |
194 | { | |
195 | struct tps6586x *tps6586x = container_of(gc, struct tps6586x, gpio); | |
196 | uint8_t val; | |
197 | int ret; | |
198 | ||
199 | ret = __tps6586x_read(tps6586x->client, TPS6586X_GPIOSET2, &val); | |
200 | if (ret) | |
201 | return ret; | |
202 | ||
203 | return !!(val & (1 << offset)); | |
204 | } | |
205 | ||
206 | ||
207 | static void tps6586x_gpio_set(struct gpio_chip *chip, unsigned offset, | |
208 | int value) | |
209 | { | |
210 | struct tps6586x *tps6586x = container_of(chip, struct tps6586x, gpio); | |
211 | ||
212 | __tps6586x_write(tps6586x->client, TPS6586X_GPIOSET2, | |
213 | value << offset); | |
214 | } | |
215 | ||
216 | static int tps6586x_gpio_output(struct gpio_chip *gc, unsigned offset, | |
217 | int value) | |
218 | { | |
219 | struct tps6586x *tps6586x = container_of(gc, struct tps6586x, gpio); | |
220 | uint8_t val, mask; | |
221 | ||
222 | tps6586x_gpio_set(gc, offset, value); | |
223 | ||
224 | val = 0x1 << (offset * 2); | |
225 | mask = 0x3 << (offset * 2); | |
226 | ||
227 | return tps6586x_update(tps6586x->dev, TPS6586X_GPIOSET1, val, mask); | |
228 | } | |
229 | ||
230 | static void tps6586x_gpio_init(struct tps6586x *tps6586x, int gpio_base) | |
231 | { | |
232 | int ret; | |
233 | ||
234 | if (!gpio_base) | |
235 | return; | |
236 | ||
237 | tps6586x->gpio.owner = THIS_MODULE; | |
238 | tps6586x->gpio.label = tps6586x->client->name; | |
239 | tps6586x->gpio.dev = tps6586x->dev; | |
240 | tps6586x->gpio.base = gpio_base; | |
241 | tps6586x->gpio.ngpio = 4; | |
242 | tps6586x->gpio.can_sleep = 1; | |
243 | ||
244 | /* FIXME: add handling of GPIOs as dedicated inputs */ | |
245 | tps6586x->gpio.direction_output = tps6586x_gpio_output; | |
246 | tps6586x->gpio.set = tps6586x_gpio_set; | |
247 | tps6586x->gpio.get = tps6586x_gpio_get; | |
248 | ||
249 | ret = gpiochip_add(&tps6586x->gpio); | |
250 | if (ret) | |
251 | dev_warn(tps6586x->dev, "GPIO registration failed: %d\n", ret); | |
252 | } | |
253 | ||
254 | static int __remove_subdev(struct device *dev, void *unused) | |
255 | { | |
256 | platform_device_unregister(to_platform_device(dev)); | |
257 | return 0; | |
258 | } | |
259 | ||
260 | static int tps6586x_remove_subdevs(struct tps6586x *tps6586x) | |
261 | { | |
262 | return device_for_each_child(tps6586x->dev, NULL, __remove_subdev); | |
263 | } | |
264 | ||
265 | static int __devinit tps6586x_add_subdevs(struct tps6586x *tps6586x, | |
266 | struct tps6586x_platform_data *pdata) | |
267 | { | |
268 | struct tps6586x_subdev_info *subdev; | |
269 | struct platform_device *pdev; | |
270 | int i, ret = 0; | |
271 | ||
272 | for (i = 0; i < pdata->num_subdevs; i++) { | |
273 | subdev = &pdata->subdevs[i]; | |
274 | ||
275 | pdev = platform_device_alloc(subdev->name, subdev->id); | |
276 | ||
277 | pdev->dev.parent = tps6586x->dev; | |
278 | pdev->dev.platform_data = subdev->platform_data; | |
279 | ||
280 | ret = platform_device_add(pdev); | |
281 | if (ret) | |
282 | goto failed; | |
283 | } | |
284 | return 0; | |
285 | ||
286 | failed: | |
287 | tps6586x_remove_subdevs(tps6586x); | |
288 | return ret; | |
289 | } | |
290 | ||
291 | static int __devinit tps6586x_i2c_probe(struct i2c_client *client, | |
292 | const struct i2c_device_id *id) | |
293 | { | |
294 | struct tps6586x_platform_data *pdata = client->dev.platform_data; | |
295 | struct tps6586x *tps6586x; | |
296 | int ret; | |
297 | ||
298 | if (!pdata) { | |
299 | dev_err(&client->dev, "tps6586x requires platform data\n"); | |
300 | return -ENOTSUPP; | |
301 | } | |
302 | ||
303 | ret = i2c_smbus_read_byte_data(client, TPS6586X_VERSIONCRC); | |
304 | if (ret < 0) { | |
305 | dev_err(&client->dev, "Chip ID read failed: %d\n", ret); | |
306 | return -EIO; | |
307 | } | |
308 | ||
309 | if (ret != TPS658621A_VERSIONCRC) { | |
310 | dev_err(&client->dev, "Unsupported chip ID: %x\n", ret); | |
311 | return -ENODEV; | |
312 | } | |
313 | ||
314 | tps6586x = kzalloc(sizeof(struct tps6586x), GFP_KERNEL); | |
315 | if (tps6586x == NULL) | |
316 | return -ENOMEM; | |
317 | ||
318 | tps6586x->client = client; | |
319 | tps6586x->dev = &client->dev; | |
320 | i2c_set_clientdata(client, tps6586x); | |
321 | ||
322 | mutex_init(&tps6586x->lock); | |
323 | ||
324 | ret = tps6586x_add_subdevs(tps6586x, pdata); | |
325 | if (ret) { | |
326 | dev_err(&client->dev, "add devices failed: %d\n", ret); | |
327 | goto err_add_devs; | |
328 | } | |
329 | ||
330 | tps6586x_gpio_init(tps6586x, pdata->gpio_base); | |
331 | ||
332 | return 0; | |
333 | ||
334 | err_add_devs: | |
335 | kfree(tps6586x); | |
336 | return ret; | |
337 | } | |
338 | ||
339 | static int __devexit tps6586x_i2c_remove(struct i2c_client *client) | |
340 | { | |
341 | return 0; | |
342 | } | |
343 | ||
344 | static const struct i2c_device_id tps6586x_id_table[] = { | |
345 | { "tps6586x", 0 }, | |
346 | { }, | |
347 | }; | |
348 | MODULE_DEVICE_TABLE(i2c, tps6586x_id_table); | |
349 | ||
350 | static struct i2c_driver tps6586x_driver = { | |
351 | .driver = { | |
352 | .name = "tps6586x", | |
353 | .owner = THIS_MODULE, | |
354 | }, | |
355 | .probe = tps6586x_i2c_probe, | |
356 | .remove = __devexit_p(tps6586x_i2c_remove), | |
357 | .id_table = tps6586x_id_table, | |
358 | }; | |
359 | ||
360 | static int __init tps6586x_init(void) | |
361 | { | |
362 | return i2c_add_driver(&tps6586x_driver); | |
363 | } | |
364 | subsys_initcall(tps6586x_init); | |
365 | ||
366 | static void __exit tps6586x_exit(void) | |
367 | { | |
368 | i2c_del_driver(&tps6586x_driver); | |
369 | } | |
370 | module_exit(tps6586x_exit); | |
371 | ||
372 | MODULE_DESCRIPTION("TPS6586X core driver"); | |
373 | MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>"); | |
374 | MODULE_LICENSE("GPL"); | |
375 |