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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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68d641efd8
Since platform_device_add_data copies the passed data, the allocated subdev_pdata is never freed. A simple fix would be to either free subdev_pdata or put it onto the stack. But since the pcf50633 child devices can rely on beeing children of the pcf50633 core device it's much more elegant to get access to pcf50633 core structure through that link. This allows to get completly rid of pcf5033_subdev_pdata. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Paul Fertser <fercerpav@gmail.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
277 lines
6.4 KiB
C
277 lines
6.4 KiB
C
/* NXP PCF50633 ADC Driver
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*
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* (C) 2006-2008 by Openmoko, Inc.
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* Author: Balaji Rao <balajirrao@openmoko.org>
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* All rights reserved.
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*
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* Broken down from monstrous PCF50633 driver mainly by
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* Harald Welte, Andy Green and Werner Almesberger
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* NOTE: This driver does not yet support subtractive ADC mode, which means
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* you can do only one measurement per read request.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/device.h>
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#include <linux/platform_device.h>
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#include <linux/completion.h>
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#include <linux/mfd/pcf50633/core.h>
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#include <linux/mfd/pcf50633/adc.h>
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struct pcf50633_adc_request {
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int mux;
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int avg;
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int result;
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void (*callback)(struct pcf50633 *, void *, int);
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void *callback_param;
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/* Used in case of sync requests */
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struct completion completion;
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};
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#define PCF50633_MAX_ADC_FIFO_DEPTH 8
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struct pcf50633_adc {
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struct pcf50633 *pcf;
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/* Private stuff */
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struct pcf50633_adc_request *queue[PCF50633_MAX_ADC_FIFO_DEPTH];
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int queue_head;
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int queue_tail;
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struct mutex queue_mutex;
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};
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static inline struct pcf50633_adc *__to_adc(struct pcf50633 *pcf)
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{
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return platform_get_drvdata(pcf->adc_pdev);
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}
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static void adc_setup(struct pcf50633 *pcf, int channel, int avg)
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{
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channel &= PCF50633_ADCC1_ADCMUX_MASK;
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/* kill ratiometric, but enable ACCSW biasing */
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pcf50633_reg_write(pcf, PCF50633_REG_ADCC2, 0x00);
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pcf50633_reg_write(pcf, PCF50633_REG_ADCC3, 0x01);
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/* start ADC conversion on selected channel */
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pcf50633_reg_write(pcf, PCF50633_REG_ADCC1, channel | avg |
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PCF50633_ADCC1_ADCSTART | PCF50633_ADCC1_RES_10BIT);
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}
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static void trigger_next_adc_job_if_any(struct pcf50633 *pcf)
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{
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struct pcf50633_adc *adc = __to_adc(pcf);
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int head;
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head = adc->queue_head;
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if (!adc->queue[head])
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return;
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adc_setup(pcf, adc->queue[head]->mux, adc->queue[head]->avg);
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}
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static int
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adc_enqueue_request(struct pcf50633 *pcf, struct pcf50633_adc_request *req)
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{
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struct pcf50633_adc *adc = __to_adc(pcf);
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int head, tail;
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mutex_lock(&adc->queue_mutex);
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head = adc->queue_head;
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tail = adc->queue_tail;
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if (adc->queue[tail]) {
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mutex_unlock(&adc->queue_mutex);
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dev_err(pcf->dev, "ADC queue is full, dropping request\n");
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return -EBUSY;
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}
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adc->queue[tail] = req;
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if (head == tail)
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trigger_next_adc_job_if_any(pcf);
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adc->queue_tail = (tail + 1) & (PCF50633_MAX_ADC_FIFO_DEPTH - 1);
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mutex_unlock(&adc->queue_mutex);
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return 0;
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}
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static void
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pcf50633_adc_sync_read_callback(struct pcf50633 *pcf, void *param, int result)
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{
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struct pcf50633_adc_request *req = param;
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req->result = result;
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complete(&req->completion);
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}
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int pcf50633_adc_sync_read(struct pcf50633 *pcf, int mux, int avg)
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{
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struct pcf50633_adc_request *req;
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int err;
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/* req is freed when the result is ready, in interrupt handler */
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req = kzalloc(sizeof(*req), GFP_KERNEL);
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if (!req)
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return -ENOMEM;
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req->mux = mux;
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req->avg = avg;
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req->callback = pcf50633_adc_sync_read_callback;
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req->callback_param = req;
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init_completion(&req->completion);
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err = adc_enqueue_request(pcf, req);
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if (err)
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return err;
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wait_for_completion(&req->completion);
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/* FIXME by this time req might be already freed */
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return req->result;
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}
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EXPORT_SYMBOL_GPL(pcf50633_adc_sync_read);
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int pcf50633_adc_async_read(struct pcf50633 *pcf, int mux, int avg,
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void (*callback)(struct pcf50633 *, void *, int),
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void *callback_param)
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{
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struct pcf50633_adc_request *req;
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/* req is freed when the result is ready, in interrupt handler */
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req = kmalloc(sizeof(*req), GFP_KERNEL);
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if (!req)
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return -ENOMEM;
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req->mux = mux;
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req->avg = avg;
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req->callback = callback;
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req->callback_param = callback_param;
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return adc_enqueue_request(pcf, req);
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}
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EXPORT_SYMBOL_GPL(pcf50633_adc_async_read);
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static int adc_result(struct pcf50633 *pcf)
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{
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u8 adcs1, adcs3;
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u16 result;
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adcs1 = pcf50633_reg_read(pcf, PCF50633_REG_ADCS1);
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adcs3 = pcf50633_reg_read(pcf, PCF50633_REG_ADCS3);
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result = (adcs1 << 2) | (adcs3 & PCF50633_ADCS3_ADCDAT1L_MASK);
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dev_dbg(pcf->dev, "adc result = %d\n", result);
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return result;
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}
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static void pcf50633_adc_irq(int irq, void *data)
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{
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struct pcf50633_adc *adc = data;
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struct pcf50633 *pcf = adc->pcf;
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struct pcf50633_adc_request *req;
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int head, res;
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mutex_lock(&adc->queue_mutex);
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head = adc->queue_head;
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req = adc->queue[head];
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if (WARN_ON(!req)) {
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dev_err(pcf->dev, "pcf50633-adc irq: ADC queue empty!\n");
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mutex_unlock(&adc->queue_mutex);
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return;
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}
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adc->queue[head] = NULL;
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adc->queue_head = (head + 1) &
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(PCF50633_MAX_ADC_FIFO_DEPTH - 1);
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res = adc_result(pcf);
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trigger_next_adc_job_if_any(pcf);
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mutex_unlock(&adc->queue_mutex);
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req->callback(pcf, req->callback_param, res);
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kfree(req);
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}
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static int __devinit pcf50633_adc_probe(struct platform_device *pdev)
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{
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struct pcf50633_adc *adc;
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adc = kzalloc(sizeof(*adc), GFP_KERNEL);
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if (!adc)
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return -ENOMEM;
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adc->pcf = dev_to_pcf50633(pdev->dev.parent);
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platform_set_drvdata(pdev, adc);
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pcf50633_register_irq(adc->pcf, PCF50633_IRQ_ADCRDY,
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pcf50633_adc_irq, adc);
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mutex_init(&adc->queue_mutex);
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return 0;
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}
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static int __devexit pcf50633_adc_remove(struct platform_device *pdev)
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{
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struct pcf50633_adc *adc = platform_get_drvdata(pdev);
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int i, head;
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pcf50633_free_irq(adc->pcf, PCF50633_IRQ_ADCRDY);
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mutex_lock(&adc->queue_mutex);
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head = adc->queue_head;
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if (WARN_ON(adc->queue[head]))
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dev_err(adc->pcf->dev,
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"adc driver removed with request pending\n");
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for (i = 0; i < PCF50633_MAX_ADC_FIFO_DEPTH; i++)
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kfree(adc->queue[i]);
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mutex_unlock(&adc->queue_mutex);
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kfree(adc);
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return 0;
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}
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static struct platform_driver pcf50633_adc_driver = {
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.driver = {
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.name = "pcf50633-adc",
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},
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.probe = pcf50633_adc_probe,
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.remove = __devexit_p(pcf50633_adc_remove),
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};
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static int __init pcf50633_adc_init(void)
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{
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return platform_driver_register(&pcf50633_adc_driver);
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}
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module_init(pcf50633_adc_init);
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static void __exit pcf50633_adc_exit(void)
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{
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platform_driver_unregister(&pcf50633_adc_driver);
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}
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module_exit(pcf50633_adc_exit);
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MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
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MODULE_DESCRIPTION("PCF50633 adc driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:pcf50633-adc");
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