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author | Srikant Patnaik | 2015-01-11 12:28:04 +0530 |
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committer | Srikant Patnaik | 2015-01-11 12:28:04 +0530 |
commit | 871480933a1c28f8a9fed4c4d34d06c439a7a422 (patch) | |
tree | 8718f573808810c2a1e8cb8fb6ac469093ca2784 /ANDROID_3.4.5/drivers/mfd/pcf50633-adc.c | |
parent | 9d40ac5867b9aefe0722bc1f110b965ff294d30d (diff) | |
download | FOSSEE-netbook-kernel-source-871480933a1c28f8a9fed4c4d34d06c439a7a422.tar.gz FOSSEE-netbook-kernel-source-871480933a1c28f8a9fed4c4d34d06c439a7a422.tar.bz2 FOSSEE-netbook-kernel-source-871480933a1c28f8a9fed4c4d34d06c439a7a422.zip |
Moved, renamed, and deleted files
The original directory structure was scattered and unorganized.
Changes are basically to make it look like kernel structure.
Diffstat (limited to 'ANDROID_3.4.5/drivers/mfd/pcf50633-adc.c')
-rw-r--r-- | ANDROID_3.4.5/drivers/mfd/pcf50633-adc.c | 258 |
1 files changed, 0 insertions, 258 deletions
diff --git a/ANDROID_3.4.5/drivers/mfd/pcf50633-adc.c b/ANDROID_3.4.5/drivers/mfd/pcf50633-adc.c deleted file mode 100644 index 3927c17e..00000000 --- a/ANDROID_3.4.5/drivers/mfd/pcf50633-adc.c +++ /dev/null @@ -1,258 +0,0 @@ -/* NXP PCF50633 ADC Driver - * - * (C) 2006-2008 by Openmoko, Inc. - * Author: Balaji Rao <balajirrao@openmoko.org> - * All rights reserved. - * - * Broken down from monstrous PCF50633 driver mainly by - * Harald Welte, Andy Green and Werner Almesberger - * - * This program is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License as published by the - * Free Software Foundation; either version 2 of the License, or (at your - * option) any later version. - * - * NOTE: This driver does not yet support subtractive ADC mode, which means - * you can do only one measurement per read request. - */ - -#include <linux/kernel.h> -#include <linux/slab.h> -#include <linux/module.h> -#include <linux/init.h> -#include <linux/device.h> -#include <linux/platform_device.h> -#include <linux/completion.h> - -#include <linux/mfd/pcf50633/core.h> -#include <linux/mfd/pcf50633/adc.h> - -struct pcf50633_adc_request { - int mux; - int avg; - void (*callback)(struct pcf50633 *, void *, int); - void *callback_param; -}; - -struct pcf50633_adc_sync_request { - int result; - struct completion completion; -}; - -#define PCF50633_MAX_ADC_FIFO_DEPTH 8 - -struct pcf50633_adc { - struct pcf50633 *pcf; - - /* Private stuff */ - struct pcf50633_adc_request *queue[PCF50633_MAX_ADC_FIFO_DEPTH]; - int queue_head; - int queue_tail; - struct mutex queue_mutex; -}; - -static inline struct pcf50633_adc *__to_adc(struct pcf50633 *pcf) -{ - return platform_get_drvdata(pcf->adc_pdev); -} - -static void adc_setup(struct pcf50633 *pcf, int channel, int avg) -{ - channel &= PCF50633_ADCC1_ADCMUX_MASK; - - /* kill ratiometric, but enable ACCSW biasing */ - pcf50633_reg_write(pcf, PCF50633_REG_ADCC2, 0x00); - pcf50633_reg_write(pcf, PCF50633_REG_ADCC3, 0x01); - - /* start ADC conversion on selected channel */ - pcf50633_reg_write(pcf, PCF50633_REG_ADCC1, channel | avg | - PCF50633_ADCC1_ADCSTART | PCF50633_ADCC1_RES_10BIT); -} - -static void trigger_next_adc_job_if_any(struct pcf50633 *pcf) -{ - struct pcf50633_adc *adc = __to_adc(pcf); - int head; - - head = adc->queue_head; - - if (!adc->queue[head]) - return; - - adc_setup(pcf, adc->queue[head]->mux, adc->queue[head]->avg); -} - -static int -adc_enqueue_request(struct pcf50633 *pcf, struct pcf50633_adc_request *req) -{ - struct pcf50633_adc *adc = __to_adc(pcf); - int head, tail; - - mutex_lock(&adc->queue_mutex); - - head = adc->queue_head; - tail = adc->queue_tail; - - if (adc->queue[tail]) { - mutex_unlock(&adc->queue_mutex); - dev_err(pcf->dev, "ADC queue is full, dropping request\n"); - return -EBUSY; - } - - adc->queue[tail] = req; - if (head == tail) - trigger_next_adc_job_if_any(pcf); - adc->queue_tail = (tail + 1) & (PCF50633_MAX_ADC_FIFO_DEPTH - 1); - - mutex_unlock(&adc->queue_mutex); - - return 0; -} - -static void pcf50633_adc_sync_read_callback(struct pcf50633 *pcf, void *param, - int result) -{ - struct pcf50633_adc_sync_request *req = param; - - req->result = result; - complete(&req->completion); -} - -int pcf50633_adc_sync_read(struct pcf50633 *pcf, int mux, int avg) -{ - struct pcf50633_adc_sync_request req; - int ret; - - init_completion(&req.completion); - - ret = pcf50633_adc_async_read(pcf, mux, avg, - pcf50633_adc_sync_read_callback, &req); - if (ret) - return ret; - - wait_for_completion(&req.completion); - - return req.result; -} -EXPORT_SYMBOL_GPL(pcf50633_adc_sync_read); - -int pcf50633_adc_async_read(struct pcf50633 *pcf, int mux, int avg, - void (*callback)(struct pcf50633 *, void *, int), - void *callback_param) -{ - struct pcf50633_adc_request *req; - - /* req is freed when the result is ready, in interrupt handler */ - req = kmalloc(sizeof(*req), GFP_KERNEL); - if (!req) - return -ENOMEM; - - req->mux = mux; - req->avg = avg; - req->callback = callback; - req->callback_param = callback_param; - - return adc_enqueue_request(pcf, req); -} -EXPORT_SYMBOL_GPL(pcf50633_adc_async_read); - -static int adc_result(struct pcf50633 *pcf) -{ - u8 adcs1, adcs3; - u16 result; - - adcs1 = pcf50633_reg_read(pcf, PCF50633_REG_ADCS1); - adcs3 = pcf50633_reg_read(pcf, PCF50633_REG_ADCS3); - result = (adcs1 << 2) | (adcs3 & PCF50633_ADCS3_ADCDAT1L_MASK); - - dev_dbg(pcf->dev, "adc result = %d\n", result); - - return result; -} - -static void pcf50633_adc_irq(int irq, void *data) -{ - struct pcf50633_adc *adc = data; - struct pcf50633 *pcf = adc->pcf; - struct pcf50633_adc_request *req; - int head, res; - - mutex_lock(&adc->queue_mutex); - head = adc->queue_head; - - req = adc->queue[head]; - if (WARN_ON(!req)) { - dev_err(pcf->dev, "pcf50633-adc irq: ADC queue empty!\n"); - mutex_unlock(&adc->queue_mutex); - return; - } - adc->queue[head] = NULL; - adc->queue_head = (head + 1) & - (PCF50633_MAX_ADC_FIFO_DEPTH - 1); - - res = adc_result(pcf); - trigger_next_adc_job_if_any(pcf); - - mutex_unlock(&adc->queue_mutex); - - req->callback(pcf, req->callback_param, res); - kfree(req); -} - -static int __devinit pcf50633_adc_probe(struct platform_device *pdev) -{ - struct pcf50633_adc *adc; - - adc = kzalloc(sizeof(*adc), GFP_KERNEL); - if (!adc) - return -ENOMEM; - - adc->pcf = dev_to_pcf50633(pdev->dev.parent); - platform_set_drvdata(pdev, adc); - - pcf50633_register_irq(adc->pcf, PCF50633_IRQ_ADCRDY, - pcf50633_adc_irq, adc); - - mutex_init(&adc->queue_mutex); - - return 0; -} - -static int __devexit pcf50633_adc_remove(struct platform_device *pdev) -{ - struct pcf50633_adc *adc = platform_get_drvdata(pdev); - int i, head; - - pcf50633_free_irq(adc->pcf, PCF50633_IRQ_ADCRDY); - - mutex_lock(&adc->queue_mutex); - head = adc->queue_head; - - if (WARN_ON(adc->queue[head])) - dev_err(adc->pcf->dev, - "adc driver removed with request pending\n"); - - for (i = 0; i < PCF50633_MAX_ADC_FIFO_DEPTH; i++) - kfree(adc->queue[i]); - - mutex_unlock(&adc->queue_mutex); - kfree(adc); - - return 0; -} - -static struct platform_driver pcf50633_adc_driver = { - .driver = { - .name = "pcf50633-adc", - }, - .probe = pcf50633_adc_probe, - .remove = __devexit_p(pcf50633_adc_remove), -}; - -module_platform_driver(pcf50633_adc_driver); - -MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>"); -MODULE_DESCRIPTION("PCF50633 adc driver"); -MODULE_LICENSE("GPL"); -MODULE_ALIAS("platform:pcf50633-adc"); - |