Commit 14fa56917d73d823538151b0429d98211fa439c1
Committed by
Samuel Ortiz
1 parent
516eca2726
Exists in
master
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39 other branches
mfd: add U300 AB3100 core support
This adds a core driver for the AB3100 mixed-signal circuit found in the ST-Ericsson U300 series platforms. This driver is a singleton proxy for all accesses to the AB3100 sub-drivers which will be merged on top of this one, RTC, regulators, battery and system power control, vibrator, LEDs, and an ALSA codec. Signed-off-by: Linus Walleij <linus.walleij@stericsson.com> Reviewed-by: Mike Rapoport <mike@compulab.co.il> Reviewed-by: Ben Dooks <ben-linux@fluff.org> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Showing 4 changed files with 1110 additions and 1 deletions Side-by-side Diff
drivers/mfd/Kconfig
... | ... | @@ -241,6 +241,20 @@ |
241 | 241 | Say yes here if you want to include support GPIO for pins on |
242 | 242 | the PCF50633 chip. |
243 | 243 | |
244 | +config AB3100_CORE | |
245 | + tristate "ST-Ericsson AB3100 Mixed Signal Circuit core functions" | |
246 | + depends on I2C | |
247 | + default y if ARCH_U300 | |
248 | + help | |
249 | + Select this to enable the AB3100 Mixed Signal IC core | |
250 | + functionality. This connects to a AB3100 on the I2C bus | |
251 | + and expose a number of symbols needed for dependent devices | |
252 | + to read and write registers and subscribe to events from | |
253 | + this multi-functional IC. This is needed to use other features | |
254 | + of the AB3100 such as battery-backed RTC, charging control, | |
255 | + LEDs, vibrator, system power and temperature, power management | |
256 | + and ALSA sound. | |
257 | + | |
244 | 258 | endmenu |
245 | 259 | |
246 | 260 | menu "Multimedia Capabilities Port drivers" |
drivers/mfd/Makefile
drivers/mfd/ab3100-core.c
1 | +/* | |
2 | + * Copyright (C) 2007-2009 ST-Ericsson | |
3 | + * License terms: GNU General Public License (GPL) version 2 | |
4 | + * Low-level core for exclusive access to the AB3100 IC on the I2C bus | |
5 | + * and some basic chip-configuration. | |
6 | + * Author: Linus Walleij <linus.walleij@stericsson.com> | |
7 | + */ | |
8 | + | |
9 | +#include <linux/i2c.h> | |
10 | +#include <linux/mutex.h> | |
11 | +#include <linux/list.h> | |
12 | +#include <linux/notifier.h> | |
13 | +#include <linux/err.h> | |
14 | +#include <linux/platform_device.h> | |
15 | +#include <linux/device.h> | |
16 | +#include <linux/interrupt.h> | |
17 | +#include <linux/workqueue.h> | |
18 | +#include <linux/debugfs.h> | |
19 | +#include <linux/seq_file.h> | |
20 | +#include <linux/uaccess.h> | |
21 | +#include <linux/mfd/ab3100.h> | |
22 | + | |
23 | +/* These are the only registers inside AB3100 used in this main file */ | |
24 | + | |
25 | +/* Interrupt event registers */ | |
26 | +#define AB3100_EVENTA1 0x21 | |
27 | +#define AB3100_EVENTA2 0x22 | |
28 | +#define AB3100_EVENTA3 0x23 | |
29 | + | |
30 | +/* AB3100 DAC converter registers */ | |
31 | +#define AB3100_DIS 0x00 | |
32 | +#define AB3100_D0C 0x01 | |
33 | +#define AB3100_D1C 0x02 | |
34 | +#define AB3100_D2C 0x03 | |
35 | +#define AB3100_D3C 0x04 | |
36 | + | |
37 | +/* Chip ID register */ | |
38 | +#define AB3100_CID 0x20 | |
39 | + | |
40 | +/* AB3100 interrupt registers */ | |
41 | +#define AB3100_IMRA1 0x24 | |
42 | +#define AB3100_IMRA2 0x25 | |
43 | +#define AB3100_IMRA3 0x26 | |
44 | +#define AB3100_IMRB1 0x2B | |
45 | +#define AB3100_IMRB2 0x2C | |
46 | +#define AB3100_IMRB3 0x2D | |
47 | + | |
48 | +/* System Power Monitoring and control registers */ | |
49 | +#define AB3100_MCA 0x2E | |
50 | +#define AB3100_MCB 0x2F | |
51 | + | |
52 | +/* SIM power up */ | |
53 | +#define AB3100_SUP 0x50 | |
54 | + | |
55 | +/* | |
56 | + * I2C communication | |
57 | + * | |
58 | + * The AB3100 is usually assigned address 0x48 (7-bit) | |
59 | + * The chip is defined in the platform i2c_board_data section. | |
60 | + */ | |
61 | +static unsigned short normal_i2c[] = { 0x48, I2C_CLIENT_END }; | |
62 | +I2C_CLIENT_INSMOD_1(ab3100); | |
63 | + | |
64 | +u8 ab3100_get_chip_type(struct ab3100 *ab3100) | |
65 | +{ | |
66 | + u8 chip = ABUNKNOWN; | |
67 | + | |
68 | + switch (ab3100->chip_id & 0xf0) { | |
69 | + case 0xa0: | |
70 | + chip = AB3000; | |
71 | + break; | |
72 | + case 0xc0: | |
73 | + chip = AB3100; | |
74 | + break; | |
75 | + } | |
76 | + return chip; | |
77 | +} | |
78 | +EXPORT_SYMBOL(ab3100_get_chip_type); | |
79 | + | |
80 | +int ab3100_set_register(struct ab3100 *ab3100, u8 reg, u8 regval) | |
81 | +{ | |
82 | + u8 regandval[2] = {reg, regval}; | |
83 | + int err; | |
84 | + | |
85 | + err = mutex_lock_interruptible(&ab3100->access_mutex); | |
86 | + if (err) | |
87 | + return err; | |
88 | + | |
89 | + /* | |
90 | + * A two-byte write message with the first byte containing the register | |
91 | + * number and the second byte containing the value to be written | |
92 | + * effectively sets a register in the AB3100. | |
93 | + */ | |
94 | + err = i2c_master_send(ab3100->i2c_client, regandval, 2); | |
95 | + if (err < 0) { | |
96 | + dev_err(ab3100->dev, | |
97 | + "write error (write register): %d\n", | |
98 | + err); | |
99 | + } else if (err != 2) { | |
100 | + dev_err(ab3100->dev, | |
101 | + "write error (write register) " | |
102 | + "%d bytes transferred (expected 2)\n", | |
103 | + err); | |
104 | + err = -EIO; | |
105 | + } else { | |
106 | + /* All is well */ | |
107 | + err = 0; | |
108 | + } | |
109 | + mutex_unlock(&ab3100->access_mutex); | |
110 | + return 0; | |
111 | +} | |
112 | +EXPORT_SYMBOL(ab3100_set_register); | |
113 | + | |
114 | +/* | |
115 | + * The test registers exist at an I2C bus address up one | |
116 | + * from the ordinary base. They are not supposed to be used | |
117 | + * in production code, but sometimes you have to do that | |
118 | + * anyway. It's currently only used from this file so declare | |
119 | + * it static and do not export. | |
120 | + */ | |
121 | +static int ab3100_set_test_register(struct ab3100 *ab3100, | |
122 | + u8 reg, u8 regval) | |
123 | +{ | |
124 | + u8 regandval[2] = {reg, regval}; | |
125 | + int err; | |
126 | + | |
127 | + err = mutex_lock_interruptible(&ab3100->access_mutex); | |
128 | + if (err) | |
129 | + return err; | |
130 | + | |
131 | + err = i2c_master_send(ab3100->testreg_client, regandval, 2); | |
132 | + if (err < 0) { | |
133 | + dev_err(ab3100->dev, | |
134 | + "write error (write test register): %d\n", | |
135 | + err); | |
136 | + } else if (err != 2) { | |
137 | + dev_err(ab3100->dev, | |
138 | + "write error (write test register) " | |
139 | + "%d bytes transferred (expected 2)\n", | |
140 | + err); | |
141 | + err = -EIO; | |
142 | + } else { | |
143 | + /* All is well */ | |
144 | + err = 0; | |
145 | + } | |
146 | + mutex_unlock(&ab3100->access_mutex); | |
147 | + | |
148 | + return err; | |
149 | +} | |
150 | + | |
151 | +int ab3100_get_register(struct ab3100 *ab3100, u8 reg, u8 *regval) | |
152 | +{ | |
153 | + int err; | |
154 | + | |
155 | + err = mutex_lock_interruptible(&ab3100->access_mutex); | |
156 | + if (err) | |
157 | + return err; | |
158 | + | |
159 | + /* | |
160 | + * AB3100 require an I2C "stop" command between each message, else | |
161 | + * it will not work. The only way of achieveing this with the | |
162 | + * message transport layer is to send the read and write messages | |
163 | + * separately. | |
164 | + */ | |
165 | + err = i2c_master_send(ab3100->i2c_client, ®, 1); | |
166 | + if (err < 0) { | |
167 | + dev_err(ab3100->dev, | |
168 | + "write error (send register address): %d\n", | |
169 | + err); | |
170 | + goto get_reg_out_unlock; | |
171 | + } else if (err != 1) { | |
172 | + dev_err(ab3100->dev, | |
173 | + "write error (send register address) " | |
174 | + "%d bytes transferred (expected 1)\n", | |
175 | + err); | |
176 | + err = -EIO; | |
177 | + goto get_reg_out_unlock; | |
178 | + } else { | |
179 | + /* All is well */ | |
180 | + err = 0; | |
181 | + } | |
182 | + | |
183 | + err = i2c_master_recv(ab3100->i2c_client, regval, 1); | |
184 | + if (err < 0) { | |
185 | + dev_err(ab3100->dev, | |
186 | + "write error (read register): %d\n", | |
187 | + err); | |
188 | + goto get_reg_out_unlock; | |
189 | + } else if (err != 1) { | |
190 | + dev_err(ab3100->dev, | |
191 | + "write error (read register) " | |
192 | + "%d bytes transferred (expected 1)\n", | |
193 | + err); | |
194 | + err = -EIO; | |
195 | + goto get_reg_out_unlock; | |
196 | + } else { | |
197 | + /* All is well */ | |
198 | + err = 0; | |
199 | + } | |
200 | + | |
201 | + get_reg_out_unlock: | |
202 | + mutex_unlock(&ab3100->access_mutex); | |
203 | + return err; | |
204 | +} | |
205 | +EXPORT_SYMBOL(ab3100_get_register); | |
206 | + | |
207 | +int ab3100_get_register_page(struct ab3100 *ab3100, | |
208 | + u8 first_reg, u8 *regvals, u8 numregs) | |
209 | +{ | |
210 | + int err; | |
211 | + | |
212 | + if (ab3100->chip_id == 0xa0 || | |
213 | + ab3100->chip_id == 0xa1) | |
214 | + /* These don't support paged reads */ | |
215 | + return -EIO; | |
216 | + | |
217 | + err = mutex_lock_interruptible(&ab3100->access_mutex); | |
218 | + if (err) | |
219 | + return err; | |
220 | + | |
221 | + /* | |
222 | + * Paged read also require an I2C "stop" command. | |
223 | + */ | |
224 | + err = i2c_master_send(ab3100->i2c_client, &first_reg, 1); | |
225 | + if (err < 0) { | |
226 | + dev_err(ab3100->dev, | |
227 | + "write error (send first register address): %d\n", | |
228 | + err); | |
229 | + goto get_reg_page_out_unlock; | |
230 | + } else if (err != 1) { | |
231 | + dev_err(ab3100->dev, | |
232 | + "write error (send first register address) " | |
233 | + "%d bytes transferred (expected 1)\n", | |
234 | + err); | |
235 | + err = -EIO; | |
236 | + goto get_reg_page_out_unlock; | |
237 | + } | |
238 | + | |
239 | + err = i2c_master_recv(ab3100->i2c_client, regvals, numregs); | |
240 | + if (err < 0) { | |
241 | + dev_err(ab3100->dev, | |
242 | + "write error (read register page): %d\n", | |
243 | + err); | |
244 | + goto get_reg_page_out_unlock; | |
245 | + } else if (err != numregs) { | |
246 | + dev_err(ab3100->dev, | |
247 | + "write error (read register page) " | |
248 | + "%d bytes transferred (expected %d)\n", | |
249 | + err, numregs); | |
250 | + err = -EIO; | |
251 | + goto get_reg_page_out_unlock; | |
252 | + } | |
253 | + | |
254 | + /* All is well */ | |
255 | + err = 0; | |
256 | + | |
257 | + get_reg_page_out_unlock: | |
258 | + mutex_unlock(&ab3100->access_mutex); | |
259 | + return err; | |
260 | +} | |
261 | +EXPORT_SYMBOL(ab3100_get_register_page); | |
262 | + | |
263 | +int ab3100_mask_and_set_register(struct ab3100 *ab3100, | |
264 | + u8 reg, u8 andmask, u8 ormask) | |
265 | +{ | |
266 | + u8 regandval[2] = {reg, 0}; | |
267 | + int err; | |
268 | + | |
269 | + err = mutex_lock_interruptible(&ab3100->access_mutex); | |
270 | + if (err) | |
271 | + return err; | |
272 | + | |
273 | + /* First read out the target register */ | |
274 | + err = i2c_master_send(ab3100->i2c_client, ®, 1); | |
275 | + if (err < 0) { | |
276 | + dev_err(ab3100->dev, | |
277 | + "write error (maskset send address): %d\n", | |
278 | + err); | |
279 | + goto get_maskset_unlock; | |
280 | + } else if (err != 1) { | |
281 | + dev_err(ab3100->dev, | |
282 | + "write error (maskset send address) " | |
283 | + "%d bytes transferred (expected 1)\n", | |
284 | + err); | |
285 | + err = -EIO; | |
286 | + goto get_maskset_unlock; | |
287 | + } | |
288 | + | |
289 | + err = i2c_master_recv(ab3100->i2c_client, ®andval[1], 1); | |
290 | + if (err < 0) { | |
291 | + dev_err(ab3100->dev, | |
292 | + "write error (maskset read register): %d\n", | |
293 | + err); | |
294 | + goto get_maskset_unlock; | |
295 | + } else if (err != 1) { | |
296 | + dev_err(ab3100->dev, | |
297 | + "write error (maskset read register) " | |
298 | + "%d bytes transferred (expected 1)\n", | |
299 | + err); | |
300 | + err = -EIO; | |
301 | + goto get_maskset_unlock; | |
302 | + } | |
303 | + | |
304 | + /* Modify the register */ | |
305 | + regandval[1] &= andmask; | |
306 | + regandval[1] |= ormask; | |
307 | + | |
308 | + /* Write the register */ | |
309 | + err = i2c_master_send(ab3100->i2c_client, regandval, 2); | |
310 | + if (err < 0) { | |
311 | + dev_err(ab3100->dev, | |
312 | + "write error (write register): %d\n", | |
313 | + err); | |
314 | + goto get_maskset_unlock; | |
315 | + } else if (err != 2) { | |
316 | + dev_err(ab3100->dev, | |
317 | + "write error (write register) " | |
318 | + "%d bytes transferred (expected 2)\n", | |
319 | + err); | |
320 | + err = -EIO; | |
321 | + goto get_maskset_unlock; | |
322 | + } | |
323 | + | |
324 | + /* All is well */ | |
325 | + err = 0; | |
326 | + | |
327 | + get_maskset_unlock: | |
328 | + mutex_unlock(&ab3100->access_mutex); | |
329 | + return err; | |
330 | +} | |
331 | +EXPORT_SYMBOL(ab3100_mask_and_set_register); | |
332 | + | |
333 | +/* | |
334 | + * Register a simple callback for handling any AB3100 events. | |
335 | + */ | |
336 | +int ab3100_event_register(struct ab3100 *ab3100, | |
337 | + struct notifier_block *nb) | |
338 | +{ | |
339 | + return blocking_notifier_chain_register(&ab3100->event_subscribers, | |
340 | + nb); | |
341 | +} | |
342 | +EXPORT_SYMBOL(ab3100_event_register); | |
343 | + | |
344 | +/* | |
345 | + * Remove a previously registered callback. | |
346 | + */ | |
347 | +int ab3100_event_unregister(struct ab3100 *ab3100, | |
348 | + struct notifier_block *nb) | |
349 | +{ | |
350 | + return blocking_notifier_chain_unregister(&ab3100->event_subscribers, | |
351 | + nb); | |
352 | +} | |
353 | +EXPORT_SYMBOL(ab3100_event_unregister); | |
354 | + | |
355 | + | |
356 | +int ab3100_event_registers_startup_state_get(struct ab3100 *ab3100, | |
357 | + u32 *fatevent) | |
358 | +{ | |
359 | + if (!ab3100->startup_events_read) | |
360 | + return -EAGAIN; /* Try again later */ | |
361 | + *fatevent = ab3100->startup_events; | |
362 | + return 0; | |
363 | +} | |
364 | +EXPORT_SYMBOL(ab3100_event_registers_startup_state_get); | |
365 | + | |
366 | +/* Interrupt handling worker */ | |
367 | +static void ab3100_work(struct work_struct *work) | |
368 | +{ | |
369 | + struct ab3100 *ab3100 = container_of(work, struct ab3100, work); | |
370 | + u8 event_regs[3]; | |
371 | + u32 fatevent; | |
372 | + int err; | |
373 | + | |
374 | + err = ab3100_get_register_page(ab3100, AB3100_EVENTA1, | |
375 | + event_regs, 3); | |
376 | + if (err) | |
377 | + goto err_event_wq; | |
378 | + | |
379 | + fatevent = (event_regs[0] << 16) | | |
380 | + (event_regs[1] << 8) | | |
381 | + event_regs[2]; | |
382 | + | |
383 | + if (!ab3100->startup_events_read) { | |
384 | + ab3100->startup_events = fatevent; | |
385 | + ab3100->startup_events_read = true; | |
386 | + } | |
387 | + /* | |
388 | + * The notified parties will have to mask out the events | |
389 | + * they're interested in and react to them. They will be | |
390 | + * notified on all events, then they use the fatevent value | |
391 | + * to determine if they're interested. | |
392 | + */ | |
393 | + blocking_notifier_call_chain(&ab3100->event_subscribers, | |
394 | + fatevent, NULL); | |
395 | + | |
396 | + dev_dbg(ab3100->dev, | |
397 | + "IRQ Event: 0x%08x\n", fatevent); | |
398 | + | |
399 | + /* By now the IRQ should be acked and deasserted so enable it again */ | |
400 | + enable_irq(ab3100->i2c_client->irq); | |
401 | + return; | |
402 | + | |
403 | + err_event_wq: | |
404 | + dev_dbg(ab3100->dev, | |
405 | + "error in event workqueue\n"); | |
406 | + /* Enable the IRQ anyway, what choice do we have? */ | |
407 | + enable_irq(ab3100->i2c_client->irq); | |
408 | + return; | |
409 | +} | |
410 | + | |
411 | +static irqreturn_t ab3100_irq_handler(int irq, void *data) | |
412 | +{ | |
413 | + struct ab3100 *ab3100 = data; | |
414 | + /* | |
415 | + * Disable the IRQ and dispatch a worker to handle the | |
416 | + * event. Since the chip resides on I2C this is slow | |
417 | + * stuff and we will re-enable the interrupts once th | |
418 | + * worker has finished. | |
419 | + */ | |
420 | + disable_irq(ab3100->i2c_client->irq); | |
421 | + schedule_work(&ab3100->work); | |
422 | + return IRQ_HANDLED; | |
423 | +} | |
424 | + | |
425 | +#ifdef CONFIG_DEBUG_FS | |
426 | +/* | |
427 | + * Some debugfs entries only exposed if we're using debug | |
428 | + */ | |
429 | +static int ab3100_registers_print(struct seq_file *s, void *p) | |
430 | +{ | |
431 | + struct ab3100 *ab3100 = s->private; | |
432 | + u8 value; | |
433 | + u8 reg; | |
434 | + | |
435 | + seq_printf(s, "AB3100 registers:\n"); | |
436 | + | |
437 | + for (reg = 0; reg < 0xff; reg++) { | |
438 | + ab3100_get_register(ab3100, reg, &value); | |
439 | + seq_printf(s, "[0x%x]: 0x%x\n", reg, value); | |
440 | + } | |
441 | + return 0; | |
442 | +} | |
443 | + | |
444 | +static int ab3100_registers_open(struct inode *inode, struct file *file) | |
445 | +{ | |
446 | + return single_open(file, ab3100_registers_print, inode->i_private); | |
447 | +} | |
448 | + | |
449 | +static const struct file_operations ab3100_registers_fops = { | |
450 | + .open = ab3100_registers_open, | |
451 | + .read = seq_read, | |
452 | + .llseek = seq_lseek, | |
453 | + .release = single_release, | |
454 | + .owner = THIS_MODULE, | |
455 | +}; | |
456 | + | |
457 | +struct ab3100_get_set_reg_priv { | |
458 | + struct ab3100 *ab3100; | |
459 | + bool mode; | |
460 | +}; | |
461 | + | |
462 | +static int ab3100_get_set_reg_open_file(struct inode *inode, struct file *file) | |
463 | +{ | |
464 | + file->private_data = inode->i_private; | |
465 | + return 0; | |
466 | +} | |
467 | + | |
468 | +static int ab3100_get_set_reg(struct file *file, | |
469 | + const char __user *user_buf, | |
470 | + size_t count, loff_t *ppos) | |
471 | +{ | |
472 | + struct ab3100_get_set_reg_priv *priv = file->private_data; | |
473 | + struct ab3100 *ab3100 = priv->ab3100; | |
474 | + char buf[32]; | |
475 | + int buf_size; | |
476 | + int regp; | |
477 | + unsigned long user_reg; | |
478 | + int err; | |
479 | + int i = 0; | |
480 | + | |
481 | + /* Get userspace string and assure termination */ | |
482 | + buf_size = min(count, (sizeof(buf)-1)); | |
483 | + if (copy_from_user(buf, user_buf, buf_size)) | |
484 | + return -EFAULT; | |
485 | + buf[buf_size] = 0; | |
486 | + | |
487 | + /* | |
488 | + * The idea is here to parse a string which is either | |
489 | + * "0xnn" for reading a register, or "0xaa 0xbb" for | |
490 | + * writing 0xbb to the register 0xaa. First move past | |
491 | + * whitespace and then begin to parse the register. | |
492 | + */ | |
493 | + while ((i < buf_size) && (buf[i] == ' ')) | |
494 | + i++; | |
495 | + regp = i; | |
496 | + | |
497 | + /* | |
498 | + * Advance pointer to end of string then terminate | |
499 | + * the register string. This is needed to satisfy | |
500 | + * the strict_strtoul() function. | |
501 | + */ | |
502 | + while ((i < buf_size) && (buf[i] != ' ')) | |
503 | + i++; | |
504 | + buf[i] = '\0'; | |
505 | + | |
506 | + err = strict_strtoul(&buf[regp], 16, &user_reg); | |
507 | + if (err) | |
508 | + return err; | |
509 | + if (user_reg > 0xff) | |
510 | + return -EINVAL; | |
511 | + | |
512 | + /* Either we read or we write a register here */ | |
513 | + if (!priv->mode) { | |
514 | + /* Reading */ | |
515 | + u8 reg = (u8) user_reg; | |
516 | + u8 regvalue; | |
517 | + | |
518 | + ab3100_get_register(ab3100, reg, ®value); | |
519 | + | |
520 | + dev_info(ab3100->dev, | |
521 | + "debug read AB3100 reg[0x%02x]: 0x%02x\n", | |
522 | + reg, regvalue); | |
523 | + } else { | |
524 | + int valp; | |
525 | + unsigned long user_value; | |
526 | + u8 reg = (u8) user_reg; | |
527 | + u8 value; | |
528 | + u8 regvalue; | |
529 | + | |
530 | + /* | |
531 | + * Writing, we need some value to write to | |
532 | + * the register so keep parsing the string | |
533 | + * from userspace. | |
534 | + */ | |
535 | + i++; | |
536 | + while ((i < buf_size) && (buf[i] == ' ')) | |
537 | + i++; | |
538 | + valp = i; | |
539 | + while ((i < buf_size) && (buf[i] != ' ')) | |
540 | + i++; | |
541 | + buf[i] = '\0'; | |
542 | + | |
543 | + err = strict_strtoul(&buf[valp], 16, &user_value); | |
544 | + if (err) | |
545 | + return err; | |
546 | + if (user_reg > 0xff) | |
547 | + return -EINVAL; | |
548 | + | |
549 | + value = (u8) user_value; | |
550 | + ab3100_set_register(ab3100, reg, value); | |
551 | + ab3100_get_register(ab3100, reg, ®value); | |
552 | + | |
553 | + dev_info(ab3100->dev, | |
554 | + "debug write reg[0x%02x] with 0x%02x, " | |
555 | + "after readback: 0x%02x\n", | |
556 | + reg, value, regvalue); | |
557 | + } | |
558 | + return buf_size; | |
559 | +} | |
560 | + | |
561 | +static const struct file_operations ab3100_get_set_reg_fops = { | |
562 | + .open = ab3100_get_set_reg_open_file, | |
563 | + .write = ab3100_get_set_reg, | |
564 | +}; | |
565 | + | |
566 | +static struct dentry *ab3100_dir; | |
567 | +static struct dentry *ab3100_reg_file; | |
568 | +static struct ab3100_get_set_reg_priv ab3100_get_priv; | |
569 | +static struct dentry *ab3100_get_reg_file; | |
570 | +static struct ab3100_get_set_reg_priv ab3100_set_priv; | |
571 | +static struct dentry *ab3100_set_reg_file; | |
572 | + | |
573 | +static void ab3100_setup_debugfs(struct ab3100 *ab3100) | |
574 | +{ | |
575 | + int err; | |
576 | + | |
577 | + ab3100_dir = debugfs_create_dir("ab3100", NULL); | |
578 | + if (!ab3100_dir) | |
579 | + goto exit_no_debugfs; | |
580 | + | |
581 | + ab3100_reg_file = debugfs_create_file("registers", | |
582 | + S_IRUGO, ab3100_dir, ab3100, | |
583 | + &ab3100_registers_fops); | |
584 | + if (!ab3100_reg_file) { | |
585 | + err = -ENOMEM; | |
586 | + goto exit_destroy_dir; | |
587 | + } | |
588 | + | |
589 | + ab3100_get_priv.ab3100 = ab3100; | |
590 | + ab3100_get_priv.mode = false; | |
591 | + ab3100_get_reg_file = debugfs_create_file("get_reg", | |
592 | + S_IWUGO, ab3100_dir, &ab3100_get_priv, | |
593 | + &ab3100_get_set_reg_fops); | |
594 | + if (!ab3100_get_reg_file) { | |
595 | + err = -ENOMEM; | |
596 | + goto exit_destroy_reg; | |
597 | + } | |
598 | + | |
599 | + ab3100_set_priv.ab3100 = ab3100; | |
600 | + ab3100_set_priv.mode = true; | |
601 | + ab3100_set_reg_file = debugfs_create_file("set_reg", | |
602 | + S_IWUGO, ab3100_dir, &ab3100_set_priv, | |
603 | + &ab3100_get_set_reg_fops); | |
604 | + if (!ab3100_set_reg_file) { | |
605 | + err = -ENOMEM; | |
606 | + goto exit_destroy_get_reg; | |
607 | + } | |
608 | + return; | |
609 | + | |
610 | + exit_destroy_get_reg: | |
611 | + debugfs_remove(ab3100_get_reg_file); | |
612 | + exit_destroy_reg: | |
613 | + debugfs_remove(ab3100_reg_file); | |
614 | + exit_destroy_dir: | |
615 | + debugfs_remove(ab3100_dir); | |
616 | + exit_no_debugfs: | |
617 | + return; | |
618 | +} | |
619 | +static inline void ab3100_remove_debugfs(void) | |
620 | +{ | |
621 | + debugfs_remove(ab3100_set_reg_file); | |
622 | + debugfs_remove(ab3100_get_reg_file); | |
623 | + debugfs_remove(ab3100_reg_file); | |
624 | + debugfs_remove(ab3100_dir); | |
625 | +} | |
626 | +#else | |
627 | +static inline void ab3100_setup_debugfs(struct ab3100 *ab3100) | |
628 | +{ | |
629 | +} | |
630 | +static inline void ab3100_remove_debugfs(void) | |
631 | +{ | |
632 | +} | |
633 | +#endif | |
634 | + | |
635 | +/* | |
636 | + * Basic set-up, datastructure creation/destruction and I2C interface. | |
637 | + * This sets up a default config in the AB3100 chip so that it | |
638 | + * will work as expected. | |
639 | + */ | |
640 | + | |
641 | +struct ab3100_init_setting { | |
642 | + u8 abreg; | |
643 | + u8 setting; | |
644 | +}; | |
645 | + | |
646 | +static const struct ab3100_init_setting __initdata | |
647 | +ab3100_init_settings[] = { | |
648 | + { | |
649 | + .abreg = AB3100_MCA, | |
650 | + .setting = 0x01 | |
651 | + }, { | |
652 | + .abreg = AB3100_MCB, | |
653 | + .setting = 0x30 | |
654 | + }, { | |
655 | + .abreg = AB3100_IMRA1, | |
656 | + .setting = 0x00 | |
657 | + }, { | |
658 | + .abreg = AB3100_IMRA2, | |
659 | + .setting = 0xFF | |
660 | + }, { | |
661 | + .abreg = AB3100_IMRA3, | |
662 | + .setting = 0x01 | |
663 | + }, { | |
664 | + .abreg = AB3100_IMRB1, | |
665 | + .setting = 0xFF | |
666 | + }, { | |
667 | + .abreg = AB3100_IMRB2, | |
668 | + .setting = 0xFF | |
669 | + }, { | |
670 | + .abreg = AB3100_IMRB3, | |
671 | + .setting = 0xFF | |
672 | + }, { | |
673 | + .abreg = AB3100_SUP, | |
674 | + .setting = 0x00 | |
675 | + }, { | |
676 | + .abreg = AB3100_DIS, | |
677 | + .setting = 0xF0 | |
678 | + }, { | |
679 | + .abreg = AB3100_D0C, | |
680 | + .setting = 0x00 | |
681 | + }, { | |
682 | + .abreg = AB3100_D1C, | |
683 | + .setting = 0x00 | |
684 | + }, { | |
685 | + .abreg = AB3100_D2C, | |
686 | + .setting = 0x00 | |
687 | + }, { | |
688 | + .abreg = AB3100_D3C, | |
689 | + .setting = 0x00 | |
690 | + }, | |
691 | +}; | |
692 | + | |
693 | +static int __init ab3100_setup(struct ab3100 *ab3100) | |
694 | +{ | |
695 | + int err = 0; | |
696 | + int i; | |
697 | + | |
698 | + for (i = 0; i < ARRAY_SIZE(ab3100_init_settings); i++) { | |
699 | + err = ab3100_set_register(ab3100, | |
700 | + ab3100_init_settings[i].abreg, | |
701 | + ab3100_init_settings[i].setting); | |
702 | + if (err) | |
703 | + goto exit_no_setup; | |
704 | + } | |
705 | + | |
706 | + /* | |
707 | + * Special trick to make the AB3100 use the 32kHz clock (RTC) | |
708 | + * bit 3 in test registe 0x02 is a special, undocumented test | |
709 | + * register bit that only exist in AB3100 P1E | |
710 | + */ | |
711 | + if (ab3100->chip_id == 0xc4) { | |
712 | + dev_warn(ab3100->dev, | |
713 | + "AB3100 P1E variant detected, " | |
714 | + "forcing chip to 32KHz\n"); | |
715 | + err = ab3100_set_test_register(ab3100, 0x02, 0x08); | |
716 | + } | |
717 | + | |
718 | + exit_no_setup: | |
719 | + return err; | |
720 | +} | |
721 | + | |
722 | +/* | |
723 | + * Here we define all the platform devices that appear | |
724 | + * as children of the AB3100. These are regular platform | |
725 | + * devices with the IORESOURCE_IO .start and .end set | |
726 | + * to correspond to the internal AB3100 register range | |
727 | + * mapping to the corresponding subdevice. | |
728 | + */ | |
729 | + | |
730 | +#define AB3100_DEVICE(devname, devid) \ | |
731 | +static struct platform_device ab3100_##devname##_device = { \ | |
732 | + .name = devid, \ | |
733 | + .id = -1, \ | |
734 | +} | |
735 | + | |
736 | +/* | |
737 | + * This lists all the subdevices and corresponding register | |
738 | + * ranges. | |
739 | + */ | |
740 | +AB3100_DEVICE(dac, "ab3100-dac"); | |
741 | +AB3100_DEVICE(leds, "ab3100-leds"); | |
742 | +AB3100_DEVICE(power, "ab3100-power"); | |
743 | +AB3100_DEVICE(regulators, "ab3100-regulators"); | |
744 | +AB3100_DEVICE(sim, "ab3100-sim"); | |
745 | +AB3100_DEVICE(uart, "ab3100-uart"); | |
746 | +AB3100_DEVICE(rtc, "ab3100-rtc"); | |
747 | +AB3100_DEVICE(charger, "ab3100-charger"); | |
748 | +AB3100_DEVICE(boost, "ab3100-boost"); | |
749 | +AB3100_DEVICE(adc, "ab3100-adc"); | |
750 | +AB3100_DEVICE(fuelgauge, "ab3100-fuelgauge"); | |
751 | +AB3100_DEVICE(vibrator, "ab3100-vibrator"); | |
752 | +AB3100_DEVICE(otp, "ab3100-otp"); | |
753 | +AB3100_DEVICE(codec, "ab3100-codec"); | |
754 | + | |
755 | +static struct platform_device * | |
756 | +ab3100_platform_devs[] = { | |
757 | + &ab3100_dac_device, | |
758 | + &ab3100_leds_device, | |
759 | + &ab3100_power_device, | |
760 | + &ab3100_regulators_device, | |
761 | + &ab3100_sim_device, | |
762 | + &ab3100_uart_device, | |
763 | + &ab3100_rtc_device, | |
764 | + &ab3100_charger_device, | |
765 | + &ab3100_boost_device, | |
766 | + &ab3100_adc_device, | |
767 | + &ab3100_fuelgauge_device, | |
768 | + &ab3100_vibrator_device, | |
769 | + &ab3100_otp_device, | |
770 | + &ab3100_codec_device, | |
771 | +}; | |
772 | + | |
773 | +struct ab_family_id { | |
774 | + u8 id; | |
775 | + char *name; | |
776 | +}; | |
777 | + | |
778 | +static const struct ab_family_id ids[] __initdata = { | |
779 | + /* AB3100 */ | |
780 | + { | |
781 | + .id = 0xc0, | |
782 | + .name = "P1A" | |
783 | + }, { | |
784 | + .id = 0xc1, | |
785 | + .name = "P1B" | |
786 | + }, { | |
787 | + .id = 0xc2, | |
788 | + .name = "P1C" | |
789 | + }, { | |
790 | + .id = 0xc3, | |
791 | + .name = "P1D" | |
792 | + }, { | |
793 | + .id = 0xc4, | |
794 | + .name = "P1E" | |
795 | + }, { | |
796 | + .id = 0xc5, | |
797 | + .name = "P1F/R1A" | |
798 | + }, { | |
799 | + .id = 0xc6, | |
800 | + .name = "P1G/R1A" | |
801 | + }, { | |
802 | + .id = 0xc7, | |
803 | + .name = "P2A/R2A" | |
804 | + }, { | |
805 | + .id = 0xc8, | |
806 | + .name = "P2B/R2B" | |
807 | + }, | |
808 | + /* AB3000 variants, not supported */ | |
809 | + { | |
810 | + .id = 0xa0 | |
811 | + }, { | |
812 | + .id = 0xa1 | |
813 | + }, { | |
814 | + .id = 0xa2 | |
815 | + }, { | |
816 | + .id = 0xa3 | |
817 | + }, { | |
818 | + .id = 0xa4 | |
819 | + }, { | |
820 | + .id = 0xa5 | |
821 | + }, { | |
822 | + .id = 0xa6 | |
823 | + }, { | |
824 | + .id = 0xa7 | |
825 | + }, | |
826 | + /* Terminator */ | |
827 | + { | |
828 | + .id = 0x00, | |
829 | + }, | |
830 | +}; | |
831 | + | |
832 | +static int __init ab3100_probe(struct i2c_client *client, | |
833 | + const struct i2c_device_id *id) | |
834 | +{ | |
835 | + struct ab3100 *ab3100; | |
836 | + int err; | |
837 | + int i; | |
838 | + | |
839 | + ab3100 = kzalloc(sizeof(struct ab3100), GFP_KERNEL); | |
840 | + if (!ab3100) { | |
841 | + dev_err(&client->dev, "could not allocate AB3100 device\n"); | |
842 | + return -ENOMEM; | |
843 | + } | |
844 | + | |
845 | + /* Initialize data structure */ | |
846 | + mutex_init(&ab3100->access_mutex); | |
847 | + BLOCKING_INIT_NOTIFIER_HEAD(&ab3100->event_subscribers); | |
848 | + | |
849 | + ab3100->i2c_client = client; | |
850 | + ab3100->dev = &ab3100->i2c_client->dev; | |
851 | + | |
852 | + i2c_set_clientdata(client, ab3100); | |
853 | + | |
854 | + /* Read chip ID register */ | |
855 | + err = ab3100_get_register(ab3100, AB3100_CID, | |
856 | + &ab3100->chip_id); | |
857 | + if (err) { | |
858 | + dev_err(&client->dev, | |
859 | + "could not communicate with the AB3100 analog " | |
860 | + "baseband chip\n"); | |
861 | + goto exit_no_detect; | |
862 | + } | |
863 | + | |
864 | + for (i = 0; ids[i].id != 0x0; i++) { | |
865 | + if (ids[i].id == ab3100->chip_id) { | |
866 | + if (ids[i].name != NULL) { | |
867 | + snprintf(&ab3100->chip_name[0], | |
868 | + sizeof(ab3100->chip_name) - 1, | |
869 | + "AB3100 %s", | |
870 | + ids[i].name); | |
871 | + break; | |
872 | + } else { | |
873 | + dev_err(&client->dev, | |
874 | + "AB3000 is not supported\n"); | |
875 | + goto exit_no_detect; | |
876 | + } | |
877 | + } | |
878 | + } | |
879 | + | |
880 | + if (ids[i].id == 0x0) { | |
881 | + dev_err(&client->dev, "unknown analog baseband chip id: 0x%x\n", | |
882 | + ab3100->chip_id); | |
883 | + dev_err(&client->dev, "accepting it anyway. Please update " | |
884 | + "the driver.\n"); | |
885 | + goto exit_no_detect; | |
886 | + } | |
887 | + | |
888 | + dev_info(&client->dev, "Detected chip: %s\n", | |
889 | + &ab3100->chip_name[0]); | |
890 | + | |
891 | + /* Attach a second dummy i2c_client to the test register address */ | |
892 | + ab3100->testreg_client = i2c_new_dummy(client->adapter, | |
893 | + client->addr + 1); | |
894 | + if (!ab3100->testreg_client) { | |
895 | + err = -ENOMEM; | |
896 | + goto exit_no_testreg_client; | |
897 | + } | |
898 | + | |
899 | + strlcpy(ab3100->testreg_client->name, id->name, | |
900 | + sizeof(ab3100->testreg_client->name)); | |
901 | + | |
902 | + err = ab3100_setup(ab3100); | |
903 | + if (err) | |
904 | + goto exit_no_setup; | |
905 | + | |
906 | + INIT_WORK(&ab3100->work, ab3100_work); | |
907 | + | |
908 | + /* This real unpredictable IRQ is of course sampled for entropy */ | |
909 | + err = request_irq(client->irq, ab3100_irq_handler, | |
910 | + IRQF_DISABLED | IRQF_SAMPLE_RANDOM, | |
911 | + "AB3100 IRQ", ab3100); | |
912 | + if (err) | |
913 | + goto exit_no_irq; | |
914 | + | |
915 | + /* Set parent and a pointer back to the container in device data */ | |
916 | + for (i = 0; i < ARRAY_SIZE(ab3100_platform_devs); i++) { | |
917 | + ab3100_platform_devs[i]->dev.parent = | |
918 | + &client->dev; | |
919 | + platform_set_drvdata(ab3100_platform_devs[i], ab3100); | |
920 | + } | |
921 | + | |
922 | + /* Register the platform devices */ | |
923 | + platform_add_devices(ab3100_platform_devs, | |
924 | + ARRAY_SIZE(ab3100_platform_devs)); | |
925 | + | |
926 | + ab3100_setup_debugfs(ab3100); | |
927 | + | |
928 | + return 0; | |
929 | + | |
930 | + exit_no_irq: | |
931 | + exit_no_setup: | |
932 | + i2c_unregister_device(ab3100->testreg_client); | |
933 | + exit_no_testreg_client: | |
934 | + exit_no_detect: | |
935 | + kfree(ab3100); | |
936 | + return err; | |
937 | +} | |
938 | + | |
939 | +static int __exit ab3100_remove(struct i2c_client *client) | |
940 | +{ | |
941 | + struct ab3100 *ab3100 = i2c_get_clientdata(client); | |
942 | + int i; | |
943 | + | |
944 | + /* Unregister subdevices */ | |
945 | + for (i = 0; i < ARRAY_SIZE(ab3100_platform_devs); i++) | |
946 | + platform_device_unregister(ab3100_platform_devs[i]); | |
947 | + | |
948 | + ab3100_remove_debugfs(); | |
949 | + i2c_unregister_device(ab3100->testreg_client); | |
950 | + | |
951 | + /* | |
952 | + * At this point, all subscribers should have unregistered | |
953 | + * their notifiers so deactivate IRQ | |
954 | + */ | |
955 | + free_irq(client->irq, ab3100); | |
956 | + kfree(ab3100); | |
957 | + return 0; | |
958 | +} | |
959 | + | |
960 | +static const struct i2c_device_id ab3100_id[] = { | |
961 | + { "ab3100", ab3100 }, | |
962 | + { } | |
963 | +}; | |
964 | +MODULE_DEVICE_TABLE(i2c, ab3100_id); | |
965 | + | |
966 | +static struct i2c_driver ab3100_driver = { | |
967 | + .driver = { | |
968 | + .name = "ab3100", | |
969 | + .owner = THIS_MODULE, | |
970 | + }, | |
971 | + .id_table = ab3100_id, | |
972 | + .probe = ab3100_probe, | |
973 | + .remove = __exit_p(ab3100_remove), | |
974 | +}; | |
975 | + | |
976 | +static int __init ab3100_i2c_init(void) | |
977 | +{ | |
978 | + return i2c_add_driver(&ab3100_driver); | |
979 | +} | |
980 | + | |
981 | +static void __exit ab3100_i2c_exit(void) | |
982 | +{ | |
983 | + i2c_del_driver(&ab3100_driver); | |
984 | +} | |
985 | + | |
986 | +subsys_initcall(ab3100_i2c_init); | |
987 | +module_exit(ab3100_i2c_exit); | |
988 | + | |
989 | +MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>"); | |
990 | +MODULE_DESCRIPTION("AB3100 core driver"); | |
991 | +MODULE_LICENSE("GPL"); |
include/linux/mfd/ab3100.h
1 | +/* | |
2 | + * Copyright (C) 2007-2009 ST-Ericsson AB | |
3 | + * License terms: GNU General Public License (GPL) version 2 | |
4 | + * AB3100 core access functions | |
5 | + * Author: Linus Walleij <linus.walleij@stericsson.com> | |
6 | + */ | |
7 | + | |
8 | +#include <linux/device.h> | |
9 | + | |
10 | +#ifndef MFD_AB3100_H | |
11 | +#define MFD_AB3100_H | |
12 | + | |
13 | +#define ABUNKNOWN 0 | |
14 | +#define AB3000 1 | |
15 | +#define AB3100 2 | |
16 | + | |
17 | +/* | |
18 | + * AB3100, EVENTA1, A2 and A3 event register flags | |
19 | + * these are catenated into a single 32-bit flag in the code | |
20 | + * for event notification broadcasts. | |
21 | + */ | |
22 | +#define AB3100_EVENTA1_ONSWA (0x01<<16) | |
23 | +#define AB3100_EVENTA1_ONSWB (0x02<<16) | |
24 | +#define AB3100_EVENTA1_ONSWC (0x04<<16) | |
25 | +#define AB3100_EVENTA1_DCIO (0x08<<16) | |
26 | +#define AB3100_EVENTA1_OVER_TEMP (0x10<<16) | |
27 | +#define AB3100_EVENTA1_SIM_OFF (0x20<<16) | |
28 | +#define AB3100_EVENTA1_VBUS (0x40<<16) | |
29 | +#define AB3100_EVENTA1_VSET_USB (0x80<<16) | |
30 | + | |
31 | +#define AB3100_EVENTA2_READY_TX (0x01<<8) | |
32 | +#define AB3100_EVENTA2_READY_RX (0x02<<8) | |
33 | +#define AB3100_EVENTA2_OVERRUN_ERROR (0x04<<8) | |
34 | +#define AB3100_EVENTA2_FRAMING_ERROR (0x08<<8) | |
35 | +#define AB3100_EVENTA2_CHARG_OVERCURRENT (0x10<<8) | |
36 | +#define AB3100_EVENTA2_MIDR (0x20<<8) | |
37 | +#define AB3100_EVENTA2_BATTERY_REM (0x40<<8) | |
38 | +#define AB3100_EVENTA2_ALARM (0x80<<8) | |
39 | + | |
40 | +#define AB3100_EVENTA3_ADC_TRIG5 (0x01) | |
41 | +#define AB3100_EVENTA3_ADC_TRIG4 (0x02) | |
42 | +#define AB3100_EVENTA3_ADC_TRIG3 (0x04) | |
43 | +#define AB3100_EVENTA3_ADC_TRIG2 (0x08) | |
44 | +#define AB3100_EVENTA3_ADC_TRIGVBAT (0x10) | |
45 | +#define AB3100_EVENTA3_ADC_TRIGVTX (0x20) | |
46 | +#define AB3100_EVENTA3_ADC_TRIG1 (0x40) | |
47 | +#define AB3100_EVENTA3_ADC_TRIG0 (0x80) | |
48 | + | |
49 | +/* AB3100, STR register flags */ | |
50 | +#define AB3100_STR_ONSWA (0x01) | |
51 | +#define AB3100_STR_ONSWB (0x02) | |
52 | +#define AB3100_STR_ONSWC (0x04) | |
53 | +#define AB3100_STR_DCIO (0x08) | |
54 | +#define AB3100_STR_BOOT_MODE (0x10) | |
55 | +#define AB3100_STR_SIM_OFF (0x20) | |
56 | +#define AB3100_STR_BATT_REMOVAL (0x40) | |
57 | +#define AB3100_STR_VBUS (0x80) | |
58 | + | |
59 | +/** | |
60 | + * struct ab3100 | |
61 | + * @access_mutex: lock out concurrent accesses to the AB3100 registers | |
62 | + * @dev: pointer to the containing device | |
63 | + * @i2c_client: I2C client for this chip | |
64 | + * @testreg_client: secondary client for test registers | |
65 | + * @chip_name: name of this chip variant | |
66 | + * @chip_id: 8 bit chip ID for this chip variant | |
67 | + * @work: an event handling worker | |
68 | + * @event_subscribers: event subscribers are listed here | |
69 | + * @startup_events: a copy of the first reading of the event registers | |
70 | + * @startup_events_read: whether the first events have been read | |
71 | + * | |
72 | + * This struct is PRIVATE and devices using it should NOT | |
73 | + * access ANY fields. It is used as a token for calling the | |
74 | + * AB3100 functions. | |
75 | + */ | |
76 | +struct ab3100 { | |
77 | + struct mutex access_mutex; | |
78 | + struct device *dev; | |
79 | + struct i2c_client *i2c_client; | |
80 | + struct i2c_client *testreg_client; | |
81 | + char chip_name[32]; | |
82 | + u8 chip_id; | |
83 | + struct work_struct work; | |
84 | + struct blocking_notifier_head event_subscribers; | |
85 | + u32 startup_events; | |
86 | + bool startup_events_read; | |
87 | +}; | |
88 | + | |
89 | +int ab3100_set_register(struct ab3100 *ab3100, u8 reg, u8 regval); | |
90 | +int ab3100_get_register(struct ab3100 *ab3100, u8 reg, u8 *regval); | |
91 | +int ab3100_get_register_page(struct ab3100 *ab3100, | |
92 | + u8 first_reg, u8 *regvals, u8 numregs); | |
93 | +int ab3100_mask_and_set_register(struct ab3100 *ab3100, | |
94 | + u8 reg, u8 andmask, u8 ormask); | |
95 | +u8 ab3100_get_chip_type(struct ab3100 *ab3100); | |
96 | +int ab3100_event_register(struct ab3100 *ab3100, | |
97 | + struct notifier_block *nb); | |
98 | +int ab3100_event_unregister(struct ab3100 *ab3100, | |
99 | + struct notifier_block *nb); | |
100 | +int ab3100_event_registers_startup_state_get(struct ab3100 *ab3100, | |
101 | + u32 *fatevent); | |
102 | + | |
103 | +#endif |