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Subject[PATCH V3 2/7] mfd: PCF50633 adc driver
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Date
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>
Cc: Samuel Ortiz <sameo@openedhand.com>
Acked-by: Jonathan Cameron <jonathan.cameron@gmail.com>
---
drivers/mfd/Kconfig | 7 +
drivers/mfd/Makefile | 1
drivers/mfd/pcf50633-adc.c | 277 ++++++++++++++++++++++++++++++++++++++
include/linux/mfd/pcf50633/adc.h | 72 ++++++++++
4 files changed, 357 insertions(+), 0 deletions(-)
create mode 100644 drivers/mfd/pcf50633-adc.c
create mode 100644 include/linux/mfd/pcf50633/adc.h
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 73f4aeb..3af4cd1 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -162,6 +162,13 @@ config MFD_PCF50633
facilities, and registers devices for the various functions
so that function-specific drivers can bind to them.

+config PCF50633_ADC
+ tristate "Support for NXP PCF50633 ADC"
+ depends on MFD_PCF50633
+ help
+ Say yes here if you want to include support for ADC in the
+ NXP PCF50633 chip.
+
endmenu

menu "Multimedia Capabilities Port drivers"
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 6a4add8..7a12b09 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -34,3 +34,4 @@ obj-$(CONFIG_UCB1400_CORE) += ucb1400_core.o
obj-$(CONFIG_PMIC_DA903X) += da903x.o

obj-$(CONFIG_MFD_PCF50633) += pcf50633-core.o
+obj-$(CONFIG_PCF50633_ADC) += pcf50633-adc.o
diff --git a/drivers/mfd/pcf50633-adc.c b/drivers/mfd/pcf50633-adc.c
new file mode 100644
index 0000000..c2d05be
--- /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");
+
diff --git a/include/linux/mfd/pcf50633/adc.h b/include/linux/mfd/pcf50633/adc.h
new file mode 100644
index 0000000..56669b4
--- /dev/null
+++ b/include/linux/mfd/pcf50633/adc.h
@@ -0,0 +1,72 @@
+/*
+ * adc.h -- Driver for NXP PCF50633 ADC
+ *
+ * (C) 2006-2008 by Openmoko, Inc.
+ * All rights reserved.
+ *
+ * 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.
+ */
+
+#ifndef __LINUX_MFD_PCF50633_ADC_H
+#define __LINUX_MFD_PCF50633_ADC_H
+
+#include <linux/mfd/pcf50633/core.h>
+#include <linux/platform_device.h>
+
+/* ADC Registers */
+#define PCF50633_REG_ADCC3 0x52
+#define PCF50633_REG_ADCC2 0x53
+#define PCF50633_REG_ADCC1 0x54
+#define PCF50633_REG_ADCS1 0x55
+#define PCF50633_REG_ADCS2 0x56
+#define PCF50633_REG_ADCS3 0x57
+
+#define PCF50633_ADCC1_ADCSTART 0x01
+#define PCF50633_ADCC1_RES_10BIT 0x02
+#define PCF50633_ADCC1_AVERAGE_NO 0x00
+#define PCF50633_ADCC1_AVERAGE_4 0x04
+#define PCF50633_ADCC1_AVERAGE_8 0x08
+#define PCF50633_ADCC1_AVERAGE_16 0x0c
+#define PCF50633_ADCC1_MUX_BATSNS_RES 0x00
+#define PCF50633_ADCC1_MUX_BATSNS_SUBTR 0x10
+#define PCF50633_ADCC1_MUX_ADCIN2_RES 0x20
+#define PCF50633_ADCC1_MUX_ADCIN2_SUBTR 0x30
+#define PCF50633_ADCC1_MUX_BATTEMP 0x60
+#define PCF50633_ADCC1_MUX_ADCIN1 0x70
+#define PCF50633_ADCC1_AVERAGE_MASK 0x0c
+#define PCF50633_ADCC1_ADCMUX_MASK 0xf0
+
+#define PCF50633_ADCC2_RATIO_NONE 0x00
+#define PCF50633_ADCC2_RATIO_BATTEMP 0x01
+#define PCF50633_ADCC2_RATIO_ADCIN1 0x02
+#define PCF50633_ADCC2_RATIO_BOTH 0x03
+#define PCF50633_ADCC2_RATIOSETTL_100US 0x04
+
+#define PCF50633_ADCC3_ACCSW_EN 0x01
+#define PCF50633_ADCC3_NTCSW_EN 0x04
+#define PCF50633_ADCC3_RES_DIV_TWO 0x10
+#define PCF50633_ADCC3_RES_DIV_THREE 0x00
+
+#define PCF50633_ADCS3_REF_NTCSW 0x00
+#define PCF50633_ADCS3_REF_ACCSW 0x10
+#define PCF50633_ADCS3_REF_2V0 0x20
+#define PCF50633_ADCS3_REF_VISA 0x30
+#define PCF50633_ADCS3_REF_2V0_2 0x70
+#define PCF50633_ADCS3_ADCRDY 0x80
+
+#define PCF50633_ADCS3_ADCDAT1L_MASK 0x03
+#define PCF50633_ADCS3_ADCDAT2L_MASK 0x0c
+#define PCF50633_ADCS3_ADCDAT2L_SHIFT 2
+#define PCF50633_ASCS3_REF_MASK 0x70
+
+extern int
+pcf50633_adc_async_read(struct pcf50633 *pcf, int mux, int avg,
+ void (*callback)(struct pcf50633 *, void *, int),
+ void *callback_param);
+extern int
+pcf50633_adc_sync_read(struct pcf50633 *pcf, int mux, int avg);
+
+#endif /* __LINUX_PCF50633_ADC_H */


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