Subject: pcf50606_rebase_changes,patch

X-Git-Url: http://git.openmoko.org/?p=kernel.git;a=commitdiff_plain;h=938eddf17625cce0307f7612a3ea2560384e2384

pcf50606_rebase_changes,patch

This patch brings into andy-tracking all changes related to pcf50606 from old
balaji-tracking.

1 files changed, 279 insertions, 0 deletions

diff --git a/drivers/mfd/pcf50606-adc.c b/drivers/mfd/pcf50606-adc.c
new file mode 100644
index 00000000000..fe0336b9753
--- /dev/null
+++ b/drivers/mfd/pcf50606-adc.c
@@ -0,0 +1,279 @@
+/* Philips PCF50606 ADC Driver
+ *
+ * (C) 2006-2008 by Openmoko, Inc.
+ * Author: Balaji Rao <balajirrao@openmoko.org>
+ * All rights reserved.
+ *
+ * Broken down from monstrous PCF50606 driver mainly by
+ * Harald Welte, Andy Green, Werner Almesberger and Matt Hsu
+ *
+ *  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/module.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/completion.h>
+
+#include <linux/mfd/pcf50606/core.h>
+#include <linux/mfd/pcf50606/adc.h>
+
+struct pcf50606_adc_request {
+	int mux;
+	int result;
+	void (*callback)(struct pcf50606 *, void *, int);
+	void *callback_param;
+
+	/* Used in case of sync requests */
+	struct completion completion;
+
+};
+
+#define PCF50606_MAX_ADC_FIFO_DEPTH 8
+
+struct pcf50606_adc {
+	struct pcf50606 *pcf;
+
+	/* Private stuff */
+	struct pcf50606_adc_request *queue[PCF50606_MAX_ADC_FIFO_DEPTH];
+	int queue_head;
+	int queue_tail;
+	struct mutex queue_mutex;
+};
+
+static inline struct pcf50606_adc *__to_adc(struct pcf50606 *pcf)
+{
+	return platform_get_drvdata(pcf->adc_pdev);
+}
+
+static void adc_setup(struct pcf50606 *pcf, int channel)
+{
+	channel &= PCF50606_ADCC2_ADCMUX_MASK;
+
+	/* start ADC conversion of selected channel */
+	pcf50606_reg_write(pcf, PCF50606_REG_ADCC2, channel |
+		    PCF50606_ADCC2_ADCSTART | PCF50606_ADCC2_RES_10BIT);
+
+}
+
+static void trigger_next_adc_job_if_any(struct pcf50606 *pcf)
+{
+	struct pcf50606_adc *adc = __to_adc(pcf);
+	int head, tail;
+
+	mutex_lock(&adc->queue_mutex);
+
+	head = adc->queue_head;
+	tail = adc->queue_tail;
+
+	if (!adc->queue[head])
+		goto out;
+
+	adc_setup(pcf, adc->queue[head]->mux);
+out:
+	mutex_unlock(&adc->queue_mutex);
+}
+
+static int
+adc_enqueue_request(struct pcf50606 *pcf, struct pcf50606_adc_request *req)
+{
+	struct pcf50606_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);
+		return -EBUSY;
+	}
+
+	adc->queue[tail] = req;
+
+	adc->queue_tail =
+		(tail + 1) & (PCF50606_MAX_ADC_FIFO_DEPTH - 1);
+
+	mutex_unlock(&adc->queue_mutex);
+
+	trigger_next_adc_job_if_any(pcf);
+
+	return 0;
+}
+
+static void
+pcf50606_adc_sync_read_callback(struct pcf50606 *pcf, void *param, int result)
+{
+	struct pcf50606_adc_request *req;
+
+	/*We know here that the passed param is an adc_request object */
+	req = (struct pcf50606_adc_request *)param;
+
+	req->result = result;
+	complete(&req->completion);
+}
+
+int pcf50606_adc_sync_read(struct pcf50606 *pcf, int mux)
+{
+
+	struct pcf50606_adc_request *req;
+	int result;
+
+	/* req is freed when the result is ready, in irq handler*/
+	req = kzalloc(sizeof(*req), GFP_KERNEL);
+	if (!req)
+		return -ENOMEM;
+
+	req->mux = mux;
+	req->callback =  pcf50606_adc_sync_read_callback;
+	req->callback_param = req;
+	init_completion(&req->completion);
+
+	adc_enqueue_request(pcf, req);
+
+	if (wait_for_completion_timeout(&req->completion, 5 * HZ) == 5 * HZ) {
+		dev_err(pcf->dev, "ADC read timed out \n");
+	}
+
+	result = req->result;
+
+	return result;
+}
+EXPORT_SYMBOL_GPL(pcf50606_adc_sync_read);
+
+int pcf50606_adc_async_read(struct pcf50606 *pcf, int mux,
+			     void (*callback)(struct pcf50606 *, void *, int),
+			     void *callback_param)
+{
+	struct pcf50606_adc_request *req;
+
+	/* req is freed when the result is ready, in pcf50606_work*/
+	req = kmalloc(sizeof(*req), GFP_KERNEL);
+	if (!req)
+		return -ENOMEM;
+
+	req->mux = mux;
+	req->callback = callback;
+	req->callback_param = callback_param;
+
+	adc_enqueue_request(pcf, req);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(pcf50606_adc_async_read);
+
+static int adc_result(struct pcf50606 *pcf)
+{
+	u16 ret = (pcf50606_reg_read(pcf, PCF50606_REG_ADCS1) << 2) |
+			(pcf50606_reg_read(pcf, PCF50606_REG_ADCS2) & 0x03);
+
+	dev_info(pcf->dev, "adc result = %d\n", ret);
+
+	return ret;
+}
+
+static void pcf50606_adc_irq(int irq, void *data)
+{
+	struct pcf50606_adc *adc = data;
+	struct pcf50606 *pcf = adc->pcf;
+	struct pcf50606_adc_request *req;
+	int head;
+
+	mutex_lock(&adc->queue_mutex);
+	head = adc->queue_head;
+
+	req = adc->queue[head];
+	if (WARN_ON(!req)) {
+		dev_err(pcf->dev, "pcf50606-adc irq: ADC queue empty!\n");
+		mutex_unlock(&adc->queue_mutex);
+		return;
+	}
+
+	adc->queue[head] = NULL;
+	adc->queue_head = (head + 1) &
+				      (PCF50606_MAX_ADC_FIFO_DEPTH - 1);
+
+	mutex_unlock(&adc->queue_mutex);
+
+	req->callback(pcf, req->callback_param, adc_result(pcf));
+	kfree(req);
+
+	trigger_next_adc_job_if_any(pcf);
+}
+
+static int __devinit pcf50606_adc_probe(struct platform_device *pdev)
+{
+	struct pcf50606_subdev_pdata *pdata = pdev->dev.platform_data;
+	struct pcf50606_adc *adc;
+
+	adc = kzalloc(sizeof(*adc), GFP_KERNEL);
+	if (!adc)
+		return -ENOMEM;
+
+	adc->pcf = pdata->pcf;
+	platform_set_drvdata(pdev, adc);
+
+	pcf50606_register_irq(pdata->pcf, PCF50606_IRQ_ADCRDY,
+					pcf50606_adc_irq, adc);
+
+	mutex_init(&adc->queue_mutex);
+
+	return 0;
+}
+
+static int __devexit pcf50606_adc_remove(struct platform_device *pdev)
+{
+	struct pcf50606_adc *adc = platform_get_drvdata(pdev);
+	int i, head;
+
+	pcf50606_free_irq(adc->pcf, PCF50606_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 < PCF50606_MAX_ADC_FIFO_DEPTH; i++)
+		kfree(adc->queue[i]);
+
+	mutex_unlock(&adc->queue_mutex);
+	kfree(adc);
+
+	return 0;
+}
+
+struct platform_driver pcf50606_adc_driver = {
+	.driver = {
+		.name = "pcf50606-adc",
+	},
+	.probe = pcf50606_adc_probe,
+	.remove = __devexit_p(pcf50606_adc_remove),
+};
+
+static int __init pcf50606_adc_init(void)
+{
+		return platform_driver_register(&pcf50606_adc_driver);
+}
+module_init(pcf50606_adc_init);
+
+static void __exit pcf50606_adc_exit(void)
+{
+		platform_driver_unregister(&pcf50606_adc_driver);
+}
+module_exit(pcf50606_adc_exit);
+
+MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
+MODULE_DESCRIPTION("PCF50606 adc driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:pcf50606-adc");
+