Initial import

1 files changed, 256 insertions, 0 deletions

diff --git a/drivers/mfd/pcf50633-adc.c b/drivers/mfd/pcf50633-adc.c
new file mode 100644
index 000000000..c1984b0d1
--- /dev/null
+++ b/drivers/mfd/pcf50633-adc.c
@@ -0,0 +1,256 @@
+/* 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/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 pcf50633_adc_probe(struct platform_device *pdev)
+{
+	struct pcf50633_adc *adc;
+
+	adc = devm_kzalloc(&pdev->dev, 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 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);
+
+	return 0;
+}
+
+static struct platform_driver pcf50633_adc_driver = {
+	.driver = {
+		.name = "pcf50633-adc",
+	},
+	.probe = pcf50633_adc_probe,
+	.remove = 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");
+