mfd: PCF50633 adc driver

This patch adds basic support for the PCF50633 ADC. The subtractive mode
is not supported yet.

Since we don't have adc subsystem, it currently lives in drivers/mfd.

Signed-off-by: Balaji Rao <balajirrao@openmoko.org>
Cc: Andy Green <andy@openmoko.com>
Acked-by: Jonathan Cameron <jonathan.cameron@gmail.com>
Signed-off-by: Samuel Ortiz <sameo@openedhand.com>

1 files changed, 277 insertions, 0 deletions

diff --git a/drivers/mfd/pcf50633-adc.c b/drivers/mfd/pcf50633-adc.c
new file mode 100644
index 000000000000..c2d05becfa97
--- /dev/null
+++ b/drivers/mfd/pcf50633-adc.c
@@ -0,0 +1,277 @@
+/* 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/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;
+        int result;
+        void (*callback)(struct pcf50633 *, void *, int);
+        void *callback_param;
+
+        /* Used in case of sync requests */
+        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;
+
+        mutex_lock(&adc->queue_mutex);
+
+        head = adc->queue_head;
+
+        if (!adc->queue[head]) {
+                mutex_unlock(&adc->queue_mutex);
+                return;
+        }
+        mutex_unlock(&adc->queue_mutex);
+
+        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);
+                return -EBUSY;
+        }
+
+        adc->queue[tail] = req;
+        adc->queue_tail = (tail + 1) & (PCF50633_MAX_ADC_FIFO_DEPTH - 1);
+
+        mutex_unlock(&adc->queue_mutex);
+
+        trigger_next_adc_job_if_any(pcf);
+
+        return 0;
+}
+
+static void
+pcf50633_adc_sync_read_callback(struct pcf50633 *pcf, void *param, int result)
+{
+        struct pcf50633_adc_request *req = param;
+
+        req->result = result;
+        complete(&req->completion);
+}
+
+int pcf50633_adc_sync_read(struct pcf50633 *pcf, int mux, int avg)
+{
+        struct pcf50633_adc_request *req;
+
+        /* req is freed when the result is ready, in interrupt handler */
+        req = kzalloc(sizeof(*req), GFP_KERNEL);
+        if (!req)
+                return -ENOMEM;
+
+        req->mux = mux;
+        req->avg = avg;
+        req->callback =  pcf50633_adc_sync_read_callback;
+        req->callback_param = req;
+
+        init_completion(&req->completion);
+        adc_enqueue_request(pcf, req);
+        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;
+
+        adc_enqueue_request(pcf, req);
+
+        return 0;
+}
+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;
+
+        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);
+
+        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 pcf50633_adc_probe(struct platform_device *pdev)
+{
+        struct pcf50633_subdev_pdata *pdata = pdev->dev.platform_data;
+        struct pcf50633_adc *adc;
+
+        adc = kzalloc(sizeof(*adc), GFP_KERNEL);
+        if (!adc)
+                return -ENOMEM;
+
+        adc->pcf = pdata->pcf;
+        platform_set_drvdata(pdev, adc);
+
+        pcf50633_register_irq(pdata->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),
+};
+
+static int __init pcf50633_adc_init(void)
+{
+        return platform_driver_register(&pcf50633_adc_driver);
+}
+module_init(pcf50633_adc_init);
+
+static void __exit pcf50633_adc_exit(void)
+{
+        platform_driver_unregister(&pcf50633_adc_driver);
+}
+module_exit(pcf50633_adc_exit);
+
+MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
+MODULE_DESCRIPTION("PCF50633 adc driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:pcf50633-adc");
+