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Russell King05c45ca2005-09-11 10:26:31 +01001/*
2 * linux/drivers/mfd/ucb1x00-core.c
3 *
4 * Copyright (C) 2001 Russell King, All Rights Reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License.
9 *
10 * The UCB1x00 core driver provides basic services for handling IO,
11 * the ADC, interrupts, and accessing registers. It is designed
12 * such that everything goes through this layer, thereby providing
13 * a consistent locking methodology, as well as allowing the drivers
14 * to be used on other non-MCP-enabled hardware platforms.
15 *
16 * Note that all locks are private to this file. Nothing else may
17 * touch them.
18 */
Russell King05c45ca2005-09-11 10:26:31 +010019#include <linux/module.h>
20#include <linux/kernel.h>
Alexey Dobriyand43c36d2009-10-07 17:09:06 +040021#include <linux/sched.h>
Russell King05c45ca2005-09-11 10:26:31 +010022#include <linux/slab.h>
23#include <linux/init.h>
24#include <linux/errno.h>
25#include <linux/interrupt.h>
Russell Kinga3364402012-01-21 14:58:28 +000026#include <linux/irq.h>
Russell King05c45ca2005-09-11 10:26:31 +010027#include <linux/device.h>
Arjan van de Vena621aae2006-01-12 18:43:35 +000028#include <linux/mutex.h>
Thomas Kunzec8602ed2009-02-10 14:54:57 +010029#include <linux/mfd/ucb1x00.h>
Russell King5a09b712012-01-21 16:36:30 +000030#include <linux/pm.h>
Thomas Kunze9ca3dc82009-02-10 14:50:56 +010031#include <linux/gpio.h>
Russell King05c45ca2005-09-11 10:26:31 +010032
Arjan van de Vena621aae2006-01-12 18:43:35 +000033static DEFINE_MUTEX(ucb1x00_mutex);
Russell King05c45ca2005-09-11 10:26:31 +010034static LIST_HEAD(ucb1x00_drivers);
35static LIST_HEAD(ucb1x00_devices);
36
37/**
38 * ucb1x00_io_set_dir - set IO direction
39 * @ucb: UCB1x00 structure describing chip
40 * @in: bitfield of IO pins to be set as inputs
41 * @out: bitfield of IO pins to be set as outputs
42 *
43 * Set the IO direction of the ten general purpose IO pins on
44 * the UCB1x00 chip. The @in bitfield has priority over the
45 * @out bitfield, in that if you specify a pin as both input
46 * and output, it will end up as an input.
47 *
48 * ucb1x00_enable must have been called to enable the comms
49 * before using this function.
50 *
51 * This function takes a spinlock, disabling interrupts.
52 */
53void ucb1x00_io_set_dir(struct ucb1x00 *ucb, unsigned int in, unsigned int out)
54{
55 unsigned long flags;
56
57 spin_lock_irqsave(&ucb->io_lock, flags);
58 ucb->io_dir |= out;
59 ucb->io_dir &= ~in;
60
61 ucb1x00_reg_write(ucb, UCB_IO_DIR, ucb->io_dir);
62 spin_unlock_irqrestore(&ucb->io_lock, flags);
63}
64
65/**
66 * ucb1x00_io_write - set or clear IO outputs
67 * @ucb: UCB1x00 structure describing chip
68 * @set: bitfield of IO pins to set to logic '1'
69 * @clear: bitfield of IO pins to set to logic '0'
70 *
71 * Set the IO output state of the specified IO pins. The value
72 * is retained if the pins are subsequently configured as inputs.
73 * The @clear bitfield has priority over the @set bitfield -
74 * outputs will be cleared.
75 *
76 * ucb1x00_enable must have been called to enable the comms
77 * before using this function.
78 *
79 * This function takes a spinlock, disabling interrupts.
80 */
81void ucb1x00_io_write(struct ucb1x00 *ucb, unsigned int set, unsigned int clear)
82{
83 unsigned long flags;
84
85 spin_lock_irqsave(&ucb->io_lock, flags);
86 ucb->io_out |= set;
87 ucb->io_out &= ~clear;
88
89 ucb1x00_reg_write(ucb, UCB_IO_DATA, ucb->io_out);
90 spin_unlock_irqrestore(&ucb->io_lock, flags);
91}
92
93/**
94 * ucb1x00_io_read - read the current state of the IO pins
95 * @ucb: UCB1x00 structure describing chip
96 *
97 * Return a bitfield describing the logic state of the ten
98 * general purpose IO pins.
99 *
100 * ucb1x00_enable must have been called to enable the comms
101 * before using this function.
102 *
Russell Kingcae15472012-01-21 09:33:38 +0000103 * This function does not take any mutexes or spinlocks.
Russell King05c45ca2005-09-11 10:26:31 +0100104 */
105unsigned int ucb1x00_io_read(struct ucb1x00 *ucb)
106{
107 return ucb1x00_reg_read(ucb, UCB_IO_DATA);
108}
109
Thomas Kunze9ca3dc82009-02-10 14:50:56 +0100110static void ucb1x00_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
111{
112 struct ucb1x00 *ucb = container_of(chip, struct ucb1x00, gpio);
113 unsigned long flags;
114
115 spin_lock_irqsave(&ucb->io_lock, flags);
116 if (value)
117 ucb->io_out |= 1 << offset;
118 else
119 ucb->io_out &= ~(1 << offset);
120
Russell Kinged442b62012-01-21 18:13:20 +0000121 ucb1x00_enable(ucb);
Thomas Kunze9ca3dc82009-02-10 14:50:56 +0100122 ucb1x00_reg_write(ucb, UCB_IO_DATA, ucb->io_out);
Russell Kinged442b62012-01-21 18:13:20 +0000123 ucb1x00_disable(ucb);
Thomas Kunze9ca3dc82009-02-10 14:50:56 +0100124 spin_unlock_irqrestore(&ucb->io_lock, flags);
125}
126
127static int ucb1x00_gpio_get(struct gpio_chip *chip, unsigned offset)
128{
129 struct ucb1x00 *ucb = container_of(chip, struct ucb1x00, gpio);
Russell Kinged442b62012-01-21 18:13:20 +0000130 unsigned val;
131
132 ucb1x00_enable(ucb);
133 val = ucb1x00_reg_read(ucb, UCB_IO_DATA);
134 ucb1x00_disable(ucb);
135
Linus Walleij0c7f3f92015-12-22 15:48:33 +0100136 return !!(val & (1 << offset));
Thomas Kunze9ca3dc82009-02-10 14:50:56 +0100137}
138
139static int ucb1x00_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
140{
141 struct ucb1x00 *ucb = container_of(chip, struct ucb1x00, gpio);
142 unsigned long flags;
143
144 spin_lock_irqsave(&ucb->io_lock, flags);
145 ucb->io_dir &= ~(1 << offset);
Russell Kinged442b62012-01-21 18:13:20 +0000146 ucb1x00_enable(ucb);
Thomas Kunze9ca3dc82009-02-10 14:50:56 +0100147 ucb1x00_reg_write(ucb, UCB_IO_DIR, ucb->io_dir);
Russell Kinged442b62012-01-21 18:13:20 +0000148 ucb1x00_disable(ucb);
Thomas Kunze9ca3dc82009-02-10 14:50:56 +0100149 spin_unlock_irqrestore(&ucb->io_lock, flags);
150
151 return 0;
152}
153
154static int ucb1x00_gpio_direction_output(struct gpio_chip *chip, unsigned offset
155 , int value)
156{
157 struct ucb1x00 *ucb = container_of(chip, struct ucb1x00, gpio);
158 unsigned long flags;
Russell Kingc23bb602012-01-21 18:21:50 +0000159 unsigned old, mask = 1 << offset;
Thomas Kunze9ca3dc82009-02-10 14:50:56 +0100160
161 spin_lock_irqsave(&ucb->io_lock, flags);
Russell Kingc23bb602012-01-21 18:21:50 +0000162 old = ucb->io_out;
Thomas Kunze9ca3dc82009-02-10 14:50:56 +0100163 if (value)
Russell Kingc23bb602012-01-21 18:21:50 +0000164 ucb->io_out |= mask;
Thomas Kunze9ca3dc82009-02-10 14:50:56 +0100165 else
Russell Kingc23bb602012-01-21 18:21:50 +0000166 ucb->io_out &= ~mask;
167
Russell Kinged442b62012-01-21 18:13:20 +0000168 ucb1x00_enable(ucb);
Russell Kingc23bb602012-01-21 18:21:50 +0000169 if (old != ucb->io_out)
170 ucb1x00_reg_write(ucb, UCB_IO_DATA, ucb->io_out);
171
172 if (!(ucb->io_dir & mask)) {
173 ucb->io_dir |= mask;
174 ucb1x00_reg_write(ucb, UCB_IO_DIR, ucb->io_dir);
175 }
Russell Kinged442b62012-01-21 18:13:20 +0000176 ucb1x00_disable(ucb);
Thomas Kunze9ca3dc82009-02-10 14:50:56 +0100177 spin_unlock_irqrestore(&ucb->io_lock, flags);
178
179 return 0;
180}
181
Russell Kinga3364402012-01-21 14:58:28 +0000182static int ucb1x00_to_irq(struct gpio_chip *chip, unsigned offset)
183{
184 struct ucb1x00 *ucb = container_of(chip, struct ucb1x00, gpio);
185
186 return ucb->irq_base > 0 ? ucb->irq_base + offset : -ENXIO;
187}
188
Russell King05c45ca2005-09-11 10:26:31 +0100189/*
190 * UCB1300 data sheet says we must:
191 * 1. enable ADC => 5us (including reference startup time)
192 * 2. select input => 51*tsibclk => 4.3us
193 * 3. start conversion => 102*tsibclk => 8.5us
194 * (tsibclk = 1/11981000)
195 * Period between SIB 128-bit frames = 10.7us
196 */
197
198/**
199 * ucb1x00_adc_enable - enable the ADC converter
200 * @ucb: UCB1x00 structure describing chip
201 *
202 * Enable the ucb1x00 and ADC converter on the UCB1x00 for use.
203 * Any code wishing to use the ADC converter must call this
204 * function prior to using it.
205 *
Russell Kingcae15472012-01-21 09:33:38 +0000206 * This function takes the ADC mutex to prevent two or more
Russell King05c45ca2005-09-11 10:26:31 +0100207 * concurrent uses, and therefore may sleep. As a result, it
208 * can only be called from process context, not interrupt
209 * context.
210 *
211 * You should release the ADC as soon as possible using
212 * ucb1x00_adc_disable.
213 */
214void ucb1x00_adc_enable(struct ucb1x00 *ucb)
215{
Russell Kingcae15472012-01-21 09:33:38 +0000216 mutex_lock(&ucb->adc_mutex);
Russell King05c45ca2005-09-11 10:26:31 +0100217
218 ucb->adc_cr |= UCB_ADC_ENA;
219
220 ucb1x00_enable(ucb);
221 ucb1x00_reg_write(ucb, UCB_ADC_CR, ucb->adc_cr);
222}
223
224/**
225 * ucb1x00_adc_read - read the specified ADC channel
226 * @ucb: UCB1x00 structure describing chip
227 * @adc_channel: ADC channel mask
228 * @sync: wait for syncronisation pulse.
229 *
230 * Start an ADC conversion and wait for the result. Note that
231 * synchronised ADC conversions (via the ADCSYNC pin) must wait
232 * until the trigger is asserted and the conversion is finished.
233 *
234 * This function currently spins waiting for the conversion to
235 * complete (2 frames max without sync).
236 *
237 * If called for a synchronised ADC conversion, it may sleep
Russell Kingcae15472012-01-21 09:33:38 +0000238 * with the ADC mutex held.
Russell King05c45ca2005-09-11 10:26:31 +0100239 */
240unsigned int ucb1x00_adc_read(struct ucb1x00 *ucb, int adc_channel, int sync)
241{
242 unsigned int val;
243
244 if (sync)
245 adc_channel |= UCB_ADC_SYNC_ENA;
246
247 ucb1x00_reg_write(ucb, UCB_ADC_CR, ucb->adc_cr | adc_channel);
248 ucb1x00_reg_write(ucb, UCB_ADC_CR, ucb->adc_cr | adc_channel | UCB_ADC_START);
249
250 for (;;) {
251 val = ucb1x00_reg_read(ucb, UCB_ADC_DATA);
252 if (val & UCB_ADC_DAT_VAL)
253 break;
254 /* yield to other processes */
255 set_current_state(TASK_INTERRUPTIBLE);
256 schedule_timeout(1);
257 }
258
259 return UCB_ADC_DAT(val);
260}
261
262/**
263 * ucb1x00_adc_disable - disable the ADC converter
264 * @ucb: UCB1x00 structure describing chip
265 *
Russell Kingcae15472012-01-21 09:33:38 +0000266 * Disable the ADC converter and release the ADC mutex.
Russell King05c45ca2005-09-11 10:26:31 +0100267 */
268void ucb1x00_adc_disable(struct ucb1x00 *ucb)
269{
270 ucb->adc_cr &= ~UCB_ADC_ENA;
271 ucb1x00_reg_write(ucb, UCB_ADC_CR, ucb->adc_cr);
272 ucb1x00_disable(ucb);
273
Russell Kingcae15472012-01-21 09:33:38 +0000274 mutex_unlock(&ucb->adc_mutex);
Russell King05c45ca2005-09-11 10:26:31 +0100275}
276
277/*
278 * UCB1x00 Interrupt handling.
279 *
280 * The UCB1x00 can generate interrupts when the SIBCLK is stopped.
281 * Since we need to read an internal register, we must re-enable
282 * SIBCLK to talk to the chip. We leave the clock running until
283 * we have finished processing all interrupts from the chip.
284 */
Thomas Gleixnerbd0b9ac2015-09-14 10:42:37 +0200285static void ucb1x00_irq(struct irq_desc *desc)
Russell King05c45ca2005-09-11 10:26:31 +0100286{
Russell Kinga3364402012-01-21 14:58:28 +0000287 struct ucb1x00 *ucb = irq_desc_get_handler_data(desc);
Russell King05c45ca2005-09-11 10:26:31 +0100288 unsigned int isr, i;
289
290 ucb1x00_enable(ucb);
291 isr = ucb1x00_reg_read(ucb, UCB_IE_STATUS);
292 ucb1x00_reg_write(ucb, UCB_IE_CLEAR, isr);
293 ucb1x00_reg_write(ucb, UCB_IE_CLEAR, 0);
294
Thomas Gleixner0d674d92015-07-13 20:44:57 +0000295 for (i = 0; i < 16 && isr; i++, isr >>= 1)
Russell Kinga3364402012-01-21 14:58:28 +0000296 if (isr & 1)
297 generic_handle_irq(ucb->irq_base + i);
Russell King05c45ca2005-09-11 10:26:31 +0100298 ucb1x00_disable(ucb);
Russell King05c45ca2005-09-11 10:26:31 +0100299}
300
Russell Kinga3364402012-01-21 14:58:28 +0000301static void ucb1x00_irq_update(struct ucb1x00 *ucb, unsigned mask)
Russell King05c45ca2005-09-11 10:26:31 +0100302{
Russell Kinga3364402012-01-21 14:58:28 +0000303 ucb1x00_enable(ucb);
304 if (ucb->irq_ris_enbl & mask)
305 ucb1x00_reg_write(ucb, UCB_IE_RIS, ucb->irq_ris_enbl &
306 ucb->irq_mask);
307 if (ucb->irq_fal_enbl & mask)
308 ucb1x00_reg_write(ucb, UCB_IE_FAL, ucb->irq_fal_enbl &
309 ucb->irq_mask);
310 ucb1x00_disable(ucb);
Russell King05c45ca2005-09-11 10:26:31 +0100311}
312
Russell Kinga3364402012-01-21 14:58:28 +0000313static void ucb1x00_irq_noop(struct irq_data *data)
Russell King05c45ca2005-09-11 10:26:31 +0100314{
Russell King05c45ca2005-09-11 10:26:31 +0100315}
316
Russell Kinga3364402012-01-21 14:58:28 +0000317static void ucb1x00_irq_mask(struct irq_data *data)
Russell King05c45ca2005-09-11 10:26:31 +0100318{
Russell Kinga3364402012-01-21 14:58:28 +0000319 struct ucb1x00 *ucb = irq_data_get_irq_chip_data(data);
320 unsigned mask = 1 << (data->irq - ucb->irq_base);
Russell King05c45ca2005-09-11 10:26:31 +0100321
Russell Kinga3364402012-01-21 14:58:28 +0000322 raw_spin_lock(&ucb->irq_lock);
323 ucb->irq_mask &= ~mask;
324 ucb1x00_irq_update(ucb, mask);
325 raw_spin_unlock(&ucb->irq_lock);
Russell King05c45ca2005-09-11 10:26:31 +0100326}
327
Russell Kinga3364402012-01-21 14:58:28 +0000328static void ucb1x00_irq_unmask(struct irq_data *data)
Russell King05c45ca2005-09-11 10:26:31 +0100329{
Russell Kinga3364402012-01-21 14:58:28 +0000330 struct ucb1x00 *ucb = irq_data_get_irq_chip_data(data);
331 unsigned mask = 1 << (data->irq - ucb->irq_base);
Russell King05c45ca2005-09-11 10:26:31 +0100332
Russell Kinga3364402012-01-21 14:58:28 +0000333 raw_spin_lock(&ucb->irq_lock);
334 ucb->irq_mask |= mask;
335 ucb1x00_irq_update(ucb, mask);
336 raw_spin_unlock(&ucb->irq_lock);
Russell King05c45ca2005-09-11 10:26:31 +0100337}
338
Russell Kinga3364402012-01-21 14:58:28 +0000339static int ucb1x00_irq_set_type(struct irq_data *data, unsigned int type)
340{
341 struct ucb1x00 *ucb = irq_data_get_irq_chip_data(data);
342 unsigned mask = 1 << (data->irq - ucb->irq_base);
343
344 raw_spin_lock(&ucb->irq_lock);
345 if (type & IRQ_TYPE_EDGE_RISING)
346 ucb->irq_ris_enbl |= mask;
347 else
348 ucb->irq_ris_enbl &= ~mask;
349
350 if (type & IRQ_TYPE_EDGE_FALLING)
351 ucb->irq_fal_enbl |= mask;
352 else
353 ucb->irq_fal_enbl &= ~mask;
354 if (ucb->irq_mask & mask) {
355 ucb1x00_reg_write(ucb, UCB_IE_RIS, ucb->irq_ris_enbl &
356 ucb->irq_mask);
357 ucb1x00_reg_write(ucb, UCB_IE_FAL, ucb->irq_fal_enbl &
358 ucb->irq_mask);
359 }
360 raw_spin_unlock(&ucb->irq_lock);
361
362 return 0;
363}
364
Russell King33237612012-01-22 20:05:24 +0000365static int ucb1x00_irq_set_wake(struct irq_data *data, unsigned int on)
366{
367 struct ucb1x00 *ucb = irq_data_get_irq_chip_data(data);
368 struct ucb1x00_plat_data *pdata = ucb->mcp->attached_device.platform_data;
369 unsigned mask = 1 << (data->irq - ucb->irq_base);
370
371 if (!pdata || !pdata->can_wakeup)
372 return -EINVAL;
373
374 raw_spin_lock(&ucb->irq_lock);
375 if (on)
376 ucb->irq_wake |= mask;
377 else
378 ucb->irq_wake &= ~mask;
379 raw_spin_unlock(&ucb->irq_lock);
380
381 return 0;
382}
383
Russell Kinga3364402012-01-21 14:58:28 +0000384static struct irq_chip ucb1x00_irqchip = {
385 .name = "ucb1x00",
386 .irq_ack = ucb1x00_irq_noop,
387 .irq_mask = ucb1x00_irq_mask,
388 .irq_unmask = ucb1x00_irq_unmask,
389 .irq_set_type = ucb1x00_irq_set_type,
Russell King33237612012-01-22 20:05:24 +0000390 .irq_set_wake = ucb1x00_irq_set_wake,
Russell Kinga3364402012-01-21 14:58:28 +0000391};
392
Russell King05c45ca2005-09-11 10:26:31 +0100393static int ucb1x00_add_dev(struct ucb1x00 *ucb, struct ucb1x00_driver *drv)
394{
395 struct ucb1x00_dev *dev;
Lee Jones02a0bf62013-07-19 14:19:58 +0100396 int ret;
Russell King05c45ca2005-09-11 10:26:31 +0100397
398 dev = kmalloc(sizeof(struct ucb1x00_dev), GFP_KERNEL);
Lee Jones02a0bf62013-07-19 14:19:58 +0100399 if (!dev)
400 return -ENOMEM;
Russell King05c45ca2005-09-11 10:26:31 +0100401
Lee Jones02a0bf62013-07-19 14:19:58 +0100402 dev->ucb = ucb;
403 dev->drv = drv;
Russell King05c45ca2005-09-11 10:26:31 +0100404
Lee Jones02a0bf62013-07-19 14:19:58 +0100405 ret = drv->add(dev);
406 if (ret) {
407 kfree(dev);
408 return ret;
Russell King05c45ca2005-09-11 10:26:31 +0100409 }
Lee Jones02a0bf62013-07-19 14:19:58 +0100410
411 list_add_tail(&dev->dev_node, &ucb->devs);
412 list_add_tail(&dev->drv_node, &drv->devs);
413
Russell King05c45ca2005-09-11 10:26:31 +0100414 return ret;
415}
416
417static void ucb1x00_remove_dev(struct ucb1x00_dev *dev)
418{
419 dev->drv->remove(dev);
420 list_del(&dev->dev_node);
421 list_del(&dev->drv_node);
422 kfree(dev);
423}
424
425/*
426 * Try to probe our interrupt, rather than relying on lots of
427 * hard-coded machine dependencies. For reference, the expected
428 * IRQ mappings are:
429 *
430 * Machine Default IRQ
431 * adsbitsy IRQ_GPCIN4
432 * cerf IRQ_GPIO_UCB1200_IRQ
433 * flexanet IRQ_GPIO_GUI
434 * freebird IRQ_GPIO_FREEBIRD_UCB1300_IRQ
435 * graphicsclient ADS_EXT_IRQ(8)
436 * graphicsmaster ADS_EXT_IRQ(8)
437 * lart LART_IRQ_UCB1200
438 * omnimeter IRQ_GPIO23
439 * pfs168 IRQ_GPIO_UCB1300_IRQ
440 * simpad IRQ_GPIO_UCB1300_IRQ
441 * shannon SHANNON_IRQ_GPIO_IRQ_CODEC
442 * yopy IRQ_GPIO_UCB1200_IRQ
443 */
444static int ucb1x00_detect_irq(struct ucb1x00 *ucb)
445{
446 unsigned long mask;
447
448 mask = probe_irq_on();
Ingo Molnarcfc73652006-06-26 15:26:13 +0100449 if (!mask) {
450 probe_irq_off(mask);
Russell King05c45ca2005-09-11 10:26:31 +0100451 return NO_IRQ;
Ingo Molnarcfc73652006-06-26 15:26:13 +0100452 }
Russell King05c45ca2005-09-11 10:26:31 +0100453
454 /*
455 * Enable the ADC interrupt.
456 */
457 ucb1x00_reg_write(ucb, UCB_IE_RIS, UCB_IE_ADC);
458 ucb1x00_reg_write(ucb, UCB_IE_FAL, UCB_IE_ADC);
459 ucb1x00_reg_write(ucb, UCB_IE_CLEAR, 0xffff);
460 ucb1x00_reg_write(ucb, UCB_IE_CLEAR, 0);
461
462 /*
463 * Cause an ADC interrupt.
464 */
465 ucb1x00_reg_write(ucb, UCB_ADC_CR, UCB_ADC_ENA);
466 ucb1x00_reg_write(ucb, UCB_ADC_CR, UCB_ADC_ENA | UCB_ADC_START);
467
468 /*
469 * Wait for the conversion to complete.
470 */
471 while ((ucb1x00_reg_read(ucb, UCB_ADC_DATA) & UCB_ADC_DAT_VAL) == 0);
472 ucb1x00_reg_write(ucb, UCB_ADC_CR, 0);
473
474 /*
475 * Disable and clear interrupt.
476 */
477 ucb1x00_reg_write(ucb, UCB_IE_RIS, 0);
478 ucb1x00_reg_write(ucb, UCB_IE_FAL, 0);
479 ucb1x00_reg_write(ucb, UCB_IE_CLEAR, 0xffff);
480 ucb1x00_reg_write(ucb, UCB_IE_CLEAR, 0);
481
482 /*
483 * Read triggered interrupt.
484 */
485 return probe_irq_off(mask);
486}
487
Tony Jones0c554452007-09-25 02:03:03 +0200488static void ucb1x00_release(struct device *dev)
Nicolas Pitre585f5452005-10-10 18:22:17 +0100489{
490 struct ucb1x00 *ucb = classdev_to_ucb1x00(dev);
491 kfree(ucb);
492}
493
494static struct class ucb1x00_class = {
495 .name = "ucb1x00",
Tony Jones0c554452007-09-25 02:03:03 +0200496 .dev_release = ucb1x00_release,
Nicolas Pitre585f5452005-10-10 18:22:17 +0100497};
498
Russell King05c45ca2005-09-11 10:26:31 +0100499static int ucb1x00_probe(struct mcp *mcp)
500{
Russell King2f7510c2012-01-22 19:02:25 +0000501 struct ucb1x00_plat_data *pdata = mcp->attached_device.platform_data;
Russell King05c45ca2005-09-11 10:26:31 +0100502 struct ucb1x00_driver *drv;
Russell King2f7510c2012-01-22 19:02:25 +0000503 struct ucb1x00 *ucb;
Russell Kinga3364402012-01-21 14:58:28 +0000504 unsigned id, i, irq_base;
Russell King05c45ca2005-09-11 10:26:31 +0100505 int ret = -ENODEV;
506
Russell King2f7510c2012-01-22 19:02:25 +0000507 /* Tell the platform to deassert the UCB1x00 reset */
508 if (pdata && pdata->reset)
509 pdata->reset(UCB_RST_PROBE);
510
Russell King05c45ca2005-09-11 10:26:31 +0100511 mcp_enable(mcp);
512 id = mcp_reg_read(mcp, UCB_ID);
Russell King2b4d9d22012-01-21 18:24:17 +0000513 mcp_disable(mcp);
Russell King05c45ca2005-09-11 10:26:31 +0100514
Russell King65f2e752012-01-20 17:38:58 +0000515 if (id != UCB_ID_1200 && id != UCB_ID_1300 && id != UCB_ID_TC35143) {
516 printk(KERN_WARNING "UCB1x00 ID not found: %04x\n", id);
Russell King2b4d9d22012-01-21 18:24:17 +0000517 goto out;
Russell King05c45ca2005-09-11 10:26:31 +0100518 }
519
Yoann Padioleaudd00cc42007-07-19 01:49:03 -0700520 ucb = kzalloc(sizeof(struct ucb1x00), GFP_KERNEL);
Russell King05c45ca2005-09-11 10:26:31 +0100521 ret = -ENOMEM;
522 if (!ucb)
Russell King2b4d9d22012-01-21 18:24:17 +0000523 goto out;
Russell King05c45ca2005-09-11 10:26:31 +0100524
Russell Kingf5ae5872012-01-21 14:45:17 +0000525 device_initialize(&ucb->dev);
Tony Jones0c554452007-09-25 02:03:03 +0200526 ucb->dev.class = &ucb1x00_class;
527 ucb->dev.parent = &mcp->attached_device;
Russell King65f2e752012-01-20 17:38:58 +0000528 dev_set_name(&ucb->dev, "ucb1x00");
Russell King05c45ca2005-09-11 10:26:31 +0100529
Russell Kinga3364402012-01-21 14:58:28 +0000530 raw_spin_lock_init(&ucb->irq_lock);
Russell King05c45ca2005-09-11 10:26:31 +0100531 spin_lock_init(&ucb->io_lock);
Russell Kingcae15472012-01-21 09:33:38 +0000532 mutex_init(&ucb->adc_mutex);
Russell King05c45ca2005-09-11 10:26:31 +0100533
Russell King65f2e752012-01-20 17:38:58 +0000534 ucb->id = id;
Russell King05c45ca2005-09-11 10:26:31 +0100535 ucb->mcp = mcp;
Russell Kingf5ae5872012-01-21 14:45:17 +0000536
537 ret = device_add(&ucb->dev);
538 if (ret)
539 goto err_dev_add;
540
Russell King2b4d9d22012-01-21 18:24:17 +0000541 ucb1x00_enable(ucb);
Russell King05c45ca2005-09-11 10:26:31 +0100542 ucb->irq = ucb1x00_detect_irq(ucb);
Russell King2b4d9d22012-01-21 18:24:17 +0000543 ucb1x00_disable(ucb);
Russell King05c45ca2005-09-11 10:26:31 +0100544 if (ucb->irq == NO_IRQ) {
Russell Kingf5ae5872012-01-21 14:45:17 +0000545 dev_err(&ucb->dev, "IRQ probe failed\n");
Russell King05c45ca2005-09-11 10:26:31 +0100546 ret = -ENODEV;
Russell Kingf5ae5872012-01-21 14:45:17 +0000547 goto err_no_irq;
Russell King05c45ca2005-09-11 10:26:31 +0100548 }
549
Thomas Kunze9ca3dc82009-02-10 14:50:56 +0100550 ucb->gpio.base = -1;
Russell Kinga3364402012-01-21 14:58:28 +0000551 irq_base = pdata ? pdata->irq_base : 0;
552 ucb->irq_base = irq_alloc_descs(-1, irq_base, 16, -1);
553 if (ucb->irq_base < 0) {
554 dev_err(&ucb->dev, "unable to allocate 16 irqs: %d\n",
555 ucb->irq_base);
Wei Yongjun18fefda2013-09-11 19:20:37 +0800556 ret = ucb->irq_base;
Russell Kinga3364402012-01-21 14:58:28 +0000557 goto err_irq_alloc;
558 }
559
560 for (i = 0; i < 16; i++) {
561 unsigned irq = ucb->irq_base + i;
562
563 irq_set_chip_and_handler(irq, &ucb1x00_irqchip, handle_edge_irq);
564 irq_set_chip_data(irq, ucb);
Rob Herring9bd09f32015-07-27 15:55:20 -0500565 irq_clear_status_flags(irq, IRQ_NOREQUEST);
Russell Kinga3364402012-01-21 14:58:28 +0000566 }
567
568 irq_set_irq_type(ucb->irq, IRQ_TYPE_EDGE_RISING);
Russell King056c0ac2015-06-16 23:06:25 +0100569 irq_set_chained_handler_and_data(ucb->irq, ucb1x00_irq, ucb);
Russell Kinga3364402012-01-21 14:58:28 +0000570
Russell Kingabe06082012-01-20 22:13:52 +0000571 if (pdata && pdata->gpio_base) {
Thomas Kunze9ca3dc82009-02-10 14:50:56 +0100572 ucb->gpio.label = dev_name(&ucb->dev);
Linus Walleij58383c72015-11-04 09:56:26 +0100573 ucb->gpio.parent = &ucb->dev;
Russell King7655b2a2012-01-21 14:47:00 +0000574 ucb->gpio.owner = THIS_MODULE;
Russell Kingabe06082012-01-20 22:13:52 +0000575 ucb->gpio.base = pdata->gpio_base;
Thomas Kunze9ca3dc82009-02-10 14:50:56 +0100576 ucb->gpio.ngpio = 10;
577 ucb->gpio.set = ucb1x00_gpio_set;
578 ucb->gpio.get = ucb1x00_gpio_get;
579 ucb->gpio.direction_input = ucb1x00_gpio_direction_input;
580 ucb->gpio.direction_output = ucb1x00_gpio_direction_output;
Russell Kinga3364402012-01-21 14:58:28 +0000581 ucb->gpio.to_irq = ucb1x00_to_irq;
Thomas Kunze9ca3dc82009-02-10 14:50:56 +0100582 ret = gpiochip_add(&ucb->gpio);
583 if (ret)
Russell Kingf5ae5872012-01-21 14:45:17 +0000584 goto err_gpio_add;
Thomas Kunze9ca3dc82009-02-10 14:50:56 +0100585 } else
586 dev_info(&ucb->dev, "gpio_base not set so no gpiolib support");
587
Russell King05c45ca2005-09-11 10:26:31 +0100588 mcp_set_drvdata(mcp, ucb);
589
Russell King33237612012-01-22 20:05:24 +0000590 if (pdata)
591 device_set_wakeup_capable(&ucb->dev, pdata->can_wakeup);
592
Russell King05c45ca2005-09-11 10:26:31 +0100593 INIT_LIST_HEAD(&ucb->devs);
Arjan van de Vena621aae2006-01-12 18:43:35 +0000594 mutex_lock(&ucb1x00_mutex);
Russell King65b539b2012-01-21 15:35:01 +0000595 list_add_tail(&ucb->node, &ucb1x00_devices);
Russell King05c45ca2005-09-11 10:26:31 +0100596 list_for_each_entry(drv, &ucb1x00_drivers, node) {
597 ucb1x00_add_dev(ucb, drv);
598 }
Arjan van de Vena621aae2006-01-12 18:43:35 +0000599 mutex_unlock(&ucb1x00_mutex);
Thomas Kunze9ca3dc82009-02-10 14:50:56 +0100600
Russell King2f7510c2012-01-22 19:02:25 +0000601 return ret;
Russell King05c45ca2005-09-11 10:26:31 +0100602
Russell Kingf5ae5872012-01-21 14:45:17 +0000603 err_gpio_add:
Russell Kinga3364402012-01-21 14:58:28 +0000604 irq_set_chained_handler(ucb->irq, NULL);
605 err_irq_alloc:
606 if (ucb->irq_base > 0)
607 irq_free_descs(ucb->irq_base, 16);
Russell Kingf5ae5872012-01-21 14:45:17 +0000608 err_no_irq:
609 device_del(&ucb->dev);
610 err_dev_add:
611 put_device(&ucb->dev);
Russell King05c45ca2005-09-11 10:26:31 +0100612 out:
Russell King2f7510c2012-01-22 19:02:25 +0000613 if (pdata && pdata->reset)
614 pdata->reset(UCB_RST_PROBE_FAIL);
Russell King05c45ca2005-09-11 10:26:31 +0100615 return ret;
616}
617
618static void ucb1x00_remove(struct mcp *mcp)
619{
Russell King2f7510c2012-01-22 19:02:25 +0000620 struct ucb1x00_plat_data *pdata = mcp->attached_device.platform_data;
Russell King05c45ca2005-09-11 10:26:31 +0100621 struct ucb1x00 *ucb = mcp_get_drvdata(mcp);
622 struct list_head *l, *n;
623
Arjan van de Vena621aae2006-01-12 18:43:35 +0000624 mutex_lock(&ucb1x00_mutex);
Russell King05c45ca2005-09-11 10:26:31 +0100625 list_del(&ucb->node);
626 list_for_each_safe(l, n, &ucb->devs) {
627 struct ucb1x00_dev *dev = list_entry(l, struct ucb1x00_dev, dev_node);
628 ucb1x00_remove_dev(dev);
629 }
Arjan van de Vena621aae2006-01-12 18:43:35 +0000630 mutex_unlock(&ucb1x00_mutex);
Russell King05c45ca2005-09-11 10:26:31 +0100631
abdoulaye berthe88d5e522014-07-12 22:30:14 +0200632 if (ucb->gpio.base != -1)
633 gpiochip_remove(&ucb->gpio);
Thomas Kunze9ca3dc82009-02-10 14:50:56 +0100634
Russell Kinga3364402012-01-21 14:58:28 +0000635 irq_set_chained_handler(ucb->irq, NULL);
636 irq_free_descs(ucb->irq_base, 16);
Tony Jones0c554452007-09-25 02:03:03 +0200637 device_unregister(&ucb->dev);
Russell King2f7510c2012-01-22 19:02:25 +0000638
639 if (pdata && pdata->reset)
640 pdata->reset(UCB_RST_REMOVE);
Russell King05c45ca2005-09-11 10:26:31 +0100641}
642
Russell King05c45ca2005-09-11 10:26:31 +0100643int ucb1x00_register_driver(struct ucb1x00_driver *drv)
644{
645 struct ucb1x00 *ucb;
646
647 INIT_LIST_HEAD(&drv->devs);
Arjan van de Vena621aae2006-01-12 18:43:35 +0000648 mutex_lock(&ucb1x00_mutex);
Russell King65b539b2012-01-21 15:35:01 +0000649 list_add_tail(&drv->node, &ucb1x00_drivers);
Russell King05c45ca2005-09-11 10:26:31 +0100650 list_for_each_entry(ucb, &ucb1x00_devices, node) {
651 ucb1x00_add_dev(ucb, drv);
652 }
Arjan van de Vena621aae2006-01-12 18:43:35 +0000653 mutex_unlock(&ucb1x00_mutex);
Russell King05c45ca2005-09-11 10:26:31 +0100654 return 0;
655}
656
657void ucb1x00_unregister_driver(struct ucb1x00_driver *drv)
658{
659 struct list_head *n, *l;
660
Arjan van de Vena621aae2006-01-12 18:43:35 +0000661 mutex_lock(&ucb1x00_mutex);
Russell King05c45ca2005-09-11 10:26:31 +0100662 list_del(&drv->node);
663 list_for_each_safe(l, n, &drv->devs) {
664 struct ucb1x00_dev *dev = list_entry(l, struct ucb1x00_dev, drv_node);
665 ucb1x00_remove_dev(dev);
666 }
Arjan van de Vena621aae2006-01-12 18:43:35 +0000667 mutex_unlock(&ucb1x00_mutex);
Russell King05c45ca2005-09-11 10:26:31 +0100668}
669
Jingoo Han99247132013-08-02 14:45:25 +0900670#ifdef CONFIG_PM_SLEEP
Russell King5a09b712012-01-21 16:36:30 +0000671static int ucb1x00_suspend(struct device *dev)
Russell King05c45ca2005-09-11 10:26:31 +0100672{
Jingoo Han334a41c2013-07-30 17:10:05 +0900673 struct ucb1x00_plat_data *pdata = dev_get_platdata(dev);
Russell King5a09b712012-01-21 16:36:30 +0000674 struct ucb1x00 *ucb = dev_get_drvdata(dev);
675 struct ucb1x00_dev *udev;
Russell King05c45ca2005-09-11 10:26:31 +0100676
Arjan van de Vena621aae2006-01-12 18:43:35 +0000677 mutex_lock(&ucb1x00_mutex);
Russell King5a09b712012-01-21 16:36:30 +0000678 list_for_each_entry(udev, &ucb->devs, dev_node) {
679 if (udev->drv->suspend)
680 udev->drv->suspend(udev);
Russell King05c45ca2005-09-11 10:26:31 +0100681 }
Arjan van de Vena621aae2006-01-12 18:43:35 +0000682 mutex_unlock(&ucb1x00_mutex);
Russell King33237612012-01-22 20:05:24 +0000683
684 if (ucb->irq_wake) {
685 unsigned long flags;
686
687 raw_spin_lock_irqsave(&ucb->irq_lock, flags);
688 ucb1x00_enable(ucb);
689 ucb1x00_reg_write(ucb, UCB_IE_RIS, ucb->irq_ris_enbl &
690 ucb->irq_wake);
691 ucb1x00_reg_write(ucb, UCB_IE_FAL, ucb->irq_fal_enbl &
692 ucb->irq_wake);
693 ucb1x00_disable(ucb);
694 raw_spin_unlock_irqrestore(&ucb->irq_lock, flags);
695
696 enable_irq_wake(ucb->irq);
697 } else if (pdata && pdata->reset)
698 pdata->reset(UCB_RST_SUSPEND);
699
Russell King05c45ca2005-09-11 10:26:31 +0100700 return 0;
701}
702
Russell King5a09b712012-01-21 16:36:30 +0000703static int ucb1x00_resume(struct device *dev)
Russell King05c45ca2005-09-11 10:26:31 +0100704{
Jingoo Han334a41c2013-07-30 17:10:05 +0900705 struct ucb1x00_plat_data *pdata = dev_get_platdata(dev);
Russell King5a09b712012-01-21 16:36:30 +0000706 struct ucb1x00 *ucb = dev_get_drvdata(dev);
707 struct ucb1x00_dev *udev;
Russell King05c45ca2005-09-11 10:26:31 +0100708
Russell King33237612012-01-22 20:05:24 +0000709 if (!ucb->irq_wake && pdata && pdata->reset)
710 pdata->reset(UCB_RST_RESUME);
711
Russell Kinged442b62012-01-21 18:13:20 +0000712 ucb1x00_enable(ucb);
Russell King2e95e512012-01-21 18:15:24 +0000713 ucb1x00_reg_write(ucb, UCB_IO_DATA, ucb->io_out);
Thomas Kunze9ca3dc82009-02-10 14:50:56 +0100714 ucb1x00_reg_write(ucb, UCB_IO_DIR, ucb->io_dir);
Russell King33237612012-01-22 20:05:24 +0000715
716 if (ucb->irq_wake) {
717 unsigned long flags;
718
719 raw_spin_lock_irqsave(&ucb->irq_lock, flags);
720 ucb1x00_reg_write(ucb, UCB_IE_RIS, ucb->irq_ris_enbl &
721 ucb->irq_mask);
722 ucb1x00_reg_write(ucb, UCB_IE_FAL, ucb->irq_fal_enbl &
723 ucb->irq_mask);
724 raw_spin_unlock_irqrestore(&ucb->irq_lock, flags);
725
726 disable_irq_wake(ucb->irq);
727 }
Russell Kinged442b62012-01-21 18:13:20 +0000728 ucb1x00_disable(ucb);
Russell King33237612012-01-22 20:05:24 +0000729
Arjan van de Vena621aae2006-01-12 18:43:35 +0000730 mutex_lock(&ucb1x00_mutex);
Russell King5a09b712012-01-21 16:36:30 +0000731 list_for_each_entry(udev, &ucb->devs, dev_node) {
732 if (udev->drv->resume)
733 udev->drv->resume(udev);
Russell King05c45ca2005-09-11 10:26:31 +0100734 }
Arjan van de Vena621aae2006-01-12 18:43:35 +0000735 mutex_unlock(&ucb1x00_mutex);
Russell King05c45ca2005-09-11 10:26:31 +0100736 return 0;
737}
Jingoo Han99247132013-08-02 14:45:25 +0900738#endif
Russell King05c45ca2005-09-11 10:26:31 +0100739
Jingoo Han507c1332014-02-27 20:39:18 +0900740static SIMPLE_DEV_PM_OPS(ucb1x00_pm_ops, ucb1x00_suspend, ucb1x00_resume);
Russell King5a09b712012-01-21 16:36:30 +0000741
Russell King05c45ca2005-09-11 10:26:31 +0100742static struct mcp_driver ucb1x00_driver = {
743 .drv = {
744 .name = "ucb1x00",
Russell Kingddb1e042012-01-21 16:33:38 +0000745 .owner = THIS_MODULE,
Russell King5a09b712012-01-21 16:36:30 +0000746 .pm = &ucb1x00_pm_ops,
Russell King05c45ca2005-09-11 10:26:31 +0100747 },
748 .probe = ucb1x00_probe,
749 .remove = ucb1x00_remove,
Russell King05c45ca2005-09-11 10:26:31 +0100750};
751
752static int __init ucb1x00_init(void)
753{
754 int ret = class_register(&ucb1x00_class);
755 if (ret == 0) {
756 ret = mcp_driver_register(&ucb1x00_driver);
757 if (ret)
758 class_unregister(&ucb1x00_class);
759 }
760 return ret;
761}
762
763static void __exit ucb1x00_exit(void)
764{
765 mcp_driver_unregister(&ucb1x00_driver);
766 class_unregister(&ucb1x00_class);
767}
768
769module_init(ucb1x00_init);
770module_exit(ucb1x00_exit);
771
Russell King05c45ca2005-09-11 10:26:31 +0100772EXPORT_SYMBOL(ucb1x00_io_set_dir);
773EXPORT_SYMBOL(ucb1x00_io_write);
774EXPORT_SYMBOL(ucb1x00_io_read);
775
776EXPORT_SYMBOL(ucb1x00_adc_enable);
777EXPORT_SYMBOL(ucb1x00_adc_read);
778EXPORT_SYMBOL(ucb1x00_adc_disable);
779
Russell King05c45ca2005-09-11 10:26:31 +0100780EXPORT_SYMBOL(ucb1x00_register_driver);
781EXPORT_SYMBOL(ucb1x00_unregister_driver);
782
Russell Kingddb1e042012-01-21 16:33:38 +0000783MODULE_ALIAS("mcp:ucb1x00");
Russell King05c45ca2005-09-11 10:26:31 +0100784MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
785MODULE_DESCRIPTION("UCB1x00 core driver");
786MODULE_LICENSE("GPL");