[PATCH] Move ADC driver from S3C24xx to S3C and adjust it for the S3C64xx.
Maurus Cuelenaere
mcuelenaere at gmail.com
Mon Oct 5 15:33:56 EDT 2009
Hi,
this is a try at generalizing the ADC driver for S3C24xx and S3C64xx.
I've used this as a base to port over Openmoko's touchscreen driver, and now
I'd want this to get integrated into mainline.
Comments/criticism/.. welcome.
Regards,
Maurus Cuelenaere
This moves the ADC driver from plat-s3c24xx to plat-s3c and adds support for
the S3C64xx.
Signed-off-by: Maurus Cuelenaere <mcuelenaere at gmail.com>
---
arch/arm/mach-s3c6400/include/mach/map.h | 1 +
arch/arm/plat-s3c/Kconfig | 9 +
arch/arm/plat-s3c/Makefile | 4 +
arch/arm/plat-s3c/adc.c | 447 +++++++++++++++++++++++++++++
arch/arm/plat-s3c/include/plat/adc.h | 6 +-
arch/arm/plat-s3c/include/plat/regs-adc.h | 2 +
arch/arm/plat-s3c24xx/Kconfig | 7 -
arch/arm/plat-s3c24xx/Makefile | 1 -
arch/arm/plat-s3c24xx/adc.c | 434 ----------------------------
arch/arm/plat-s3c24xx/devs.c | 14 +-
arch/arm/plat-s3c64xx/Makefile | 4 +
arch/arm/plat-s3c64xx/dev-adc.c | 51 ++++
12 files changed, 533 insertions(+), 447 deletions(-)
create mode 100644 arch/arm/plat-s3c/adc.c
delete mode 100644 arch/arm/plat-s3c24xx/adc.c
create mode 100644 arch/arm/plat-s3c64xx/dev-adc.c
diff --git a/arch/arm/mach-s3c6400/include/mach/map.h
b/arch/arm/mach-s3c6400/include/mach/map.h
index fc8b223..b66bfaf 100644
--- a/arch/arm/mach-s3c6400/include/mach/map.h
+++ b/arch/arm/mach-s3c6400/include/mach/map.h
@@ -42,6 +42,7 @@
#define S3C64XX_PA_FB (0x77100000)
#define S3C64XX_PA_USB_HSOTG (0x7C000000)
#define S3C64XX_PA_WATCHDOG (0x7E004000)
+#define S3C64XX_PA_ADC (0x7E00B000)
#define S3C64XX_PA_SYSCON (0x7E00F000)
#define S3C64XX_PA_AC97 (0x7F001000)
#define S3C64XX_PA_IIS0 (0x7F002000)
diff --git a/arch/arm/plat-s3c/Kconfig b/arch/arm/plat-s3c/Kconfig
index 8931c5f..82ed66d 100644
--- a/arch/arm/plat-s3c/Kconfig
+++ b/arch/arm/plat-s3c/Kconfig
@@ -166,6 +166,15 @@ config S3C_DMA
help
Internal configuration for S3C DMA core
+# ADC
+
+config S3C_ADC
+ bool "ADC common driver support"
+ help
+ Core support for the ADC block found in the S3C SoC systems
+ for drivers such as the touchscreen and hwmon to use to share
+ this resource.
+
# device definitions to compile in
config S3C_DEV_HSMMC
diff --git a/arch/arm/plat-s3c/Makefile b/arch/arm/plat-s3c/Makefile
index 3c09109..788056a 100644
--- a/arch/arm/plat-s3c/Makefile
+++ b/arch/arm/plat-s3c/Makefile
@@ -22,6 +22,10 @@ obj-y += gpio-config.o
obj-$(CONFIG_S3C_DMA) += dma.o
+# ADC support
+
+obj-$(CONFIG_S3C_ADC) += adc.o
+
# PM support
obj-$(CONFIG_PM) += pm.o
diff --git a/arch/arm/plat-s3c/adc.c b/arch/arm/plat-s3c/adc.c
new file mode 100644
index 0000000..2436850
--- /dev/null
+++ b/arch/arm/plat-s3c/adc.c
@@ -0,0 +1,447 @@
+/* arch/arm/plat-s3c/adc.c
+ *
+ * Copyright (c) 2008 Simtec Electronics
+ * http://armlinux.simtec.co.uk/
+ * Ben Dooks <ben at simtec.co.uk>, <ben-linux at fluff.org>
+ *
+ * S3C ADC device core
+ *
+ * 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.
+*/
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/list.h>
+#include <linux/err.h>
+#include <linux/clk.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+
+#include <plat/regs-adc.h>
+#include <plat/adc.h>
+
+/* This driver is designed to control the usage of the ADC block between
+ * the touchscreen and any other drivers that may need to use it, such as
+ * the hwmon driver.
+ *
+ * Priority will be given to the touchscreen driver, but as this itself is
+ * rate limited it should not starve other requests which are processed in
+ * order that they are received.
+ *
+ * Each user registers to get a client block which uniquely identifies it
+ * and stores information such as the necessary functions to callback when
+ * action is required.
+ */
+
+struct s3c_adc_client {
+ struct platform_device *pdev;
+ struct list_head pend;
+ wait_queue_head_t *wait;
+
+ unsigned int nr_samples;
+ int result;
+ unsigned char is_ts;
+ unsigned char channel;
+
+ void (*select_cb)(struct s3c_adc_client *c, unsigned selected);
+ void (*convert_cb)(struct s3c_adc_client *c,
+ unsigned val1, unsigned val2,
+ unsigned *samples_left);
+};
+
+struct adc_device {
+ struct platform_device *pdev;
+ struct platform_device *owner;
+ struct clk *clk;
+ struct s3c_adc_client *cur;
+ struct s3c_adc_client *ts_pend;
+ void __iomem *regs;
+
+ unsigned int prescale;
+
+ int irq;
+ struct s3c_adc_platdata* pd;
+};
+
+static struct adc_device *adc_dev;
+
+static LIST_HEAD(adc_pending);
+
+#define adc_dbg(_adc, msg...) dev_dbg(&(_adc)->pdev->dev, msg)
+
+static inline void s3c_adc_convert(struct adc_device *adc)
+{
+ unsigned con = readl(adc->regs + S3C2410_ADCCON);
+
+ con |= S3C2410_ADCCON_ENABLE_START;
+ writel(con, adc->regs + S3C2410_ADCCON);
+}
+
+static inline void s3c_adc_select(struct adc_device *adc,
+ struct s3c_adc_client *client)
+{
+ unsigned con = readl(adc->regs + S3C2410_ADCCON);
+
+ client->select_cb(client, 1);
+
+ con &= ~S3C2410_ADCCON_MUXMASK;
+ con &= ~S3C2410_ADCCON_STDBM;
+ con &= ~S3C2410_ADCCON_STARTMASK;
+
+ if (!client->is_ts)
+ con |= S3C2410_ADCCON_SELMUX(client->channel);
+
+ writel(con, adc->regs + S3C2410_ADCCON);
+}
+
+static void s3c_adc_dbgshow(struct adc_device *adc)
+{
+ adc_dbg(adc, "CON=%08x, TSC=%08x, DLY=%08x\n",
+ readl(adc->regs + S3C2410_ADCCON),
+ readl(adc->regs + S3C2410_ADCTSC),
+ readl(adc->regs + S3C2410_ADCDLY));
+}
+
+static void s3c_adc_try(struct adc_device *adc)
+{
+ struct s3c_adc_client *next = adc->ts_pend;
+
+ if (!next && !list_empty(&adc_pending)) {
+ next = list_first_entry(&adc_pending,
+ struct s3c_adc_client, pend);
+ list_del(&next->pend);
+ } else
+ adc->ts_pend = NULL;
+
+ if (next) {
+ adc_dbg(adc, "new client is %p\n", next);
+ adc->cur = next;
+ s3c_adc_select(adc, next);
+ s3c_adc_convert(adc);
+ s3c_adc_dbgshow(adc);
+ }
+}
+
+int s3c_adc_start(struct s3c_adc_client *client,
+ unsigned int channel, unsigned int nr_samples)
+{
+ struct adc_device *adc = adc_dev;
+ unsigned long flags;
+
+ if (!adc) {
+ printk(KERN_ERR "%s: failed to find adc\n", __func__);
+ return -EINVAL;
+ }
+
+ if (client->is_ts && adc->ts_pend)
+ return -EAGAIN;
+
+ local_irq_save(flags);
+
+ client->channel = channel;
+ client->nr_samples = nr_samples;
+
+ if (client->is_ts)
+ adc->ts_pend = client;
+ else
+ list_add_tail(&client->pend, &adc_pending);
+
+ if (!adc->cur)
+ s3c_adc_try(adc);
+ local_irq_restore(flags);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(s3c_adc_start);
+
+static void s3c_convert_done(struct s3c_adc_client *client,
+ unsigned v, unsigned u, unsigned *left)
+{
+ client->result = v;
+ wake_up(client->wait);
+}
+
+int s3c_adc_read(struct s3c_adc_client *client, unsigned int ch)
+{
+ DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wake);
+ int ret;
+
+ client->convert_cb = s3c_convert_done;
+ client->wait = &wake;
+ client->result = -1;
+
+ ret = s3c_adc_start(client, ch, 1);
+ if (ret < 0)
+ goto err;
+
+ ret = wait_event_timeout(wake, client->result >= 0, HZ / 2);
+ if (client->result < 0) {
+ ret = -ETIMEDOUT;
+ goto err;
+ }
+
+ client->convert_cb = NULL;
+ return client->result;
+
+err:
+ return ret;
+}
+EXPORT_SYMBOL_GPL(s3c_adc_convert);
+
+static void s3c_adc_default_select(struct s3c_adc_client *client,
+ unsigned select)
+{
+}
+
+struct s3c_adc_client *s3c_adc_register(struct platform_device *pdev,
+ void (*select)(struct s3c_adc_client *client,
+ unsigned int selected),
+ void (*conv)(struct s3c_adc_client *client,
+ unsigned d0, unsigned d1,
+ unsigned *samples_left),
+ unsigned int is_ts)
+{
+ struct s3c_adc_client *client;
+
+ WARN_ON(!pdev);
+
+ if (!select)
+ select = s3c_adc_default_select;
+
+ if (!pdev)
+ return ERR_PTR(-EINVAL);
+
+ client = kzalloc(sizeof(struct s3c_adc_client), GFP_KERNEL);
+ if (!client) {
+ dev_err(&pdev->dev, "no memory for adc client\n");
+ return ERR_PTR(-ENOMEM);
+ }
+
+ client->pdev = pdev;
+ client->is_ts = is_ts;
+ client->select_cb = select;
+ client->convert_cb = conv;
+
+ return client;
+}
+EXPORT_SYMBOL_GPL(s3c_adc_register);
+
+void s3c_adc_release(struct s3c_adc_client *client)
+{
+ /* We should really check that nothing is in progress. */
+ if (adc_dev->cur == client)
+ adc_dev->cur = NULL;
+ if (adc_dev->ts_pend == client)
+ adc_dev->ts_pend = NULL;
+ else {
+ struct list_head *p, *n;
+ struct s3c_adc_client *tmp;
+
+ list_for_each_safe(p, n, &adc_pending) {
+ tmp = list_entry(p, struct s3c_adc_client, pend);
+ if (tmp == client)
+ list_del(&tmp->pend);
+ }
+ }
+
+ if (adc_dev->cur == NULL)
+ s3c_adc_try(adc_dev);
+ kfree(client);
+}
+EXPORT_SYMBOL_GPL(s3c_adc_release);
+
+static irqreturn_t s3c_adc_irq(int irq, void *pw)
+{
+ struct adc_device *adc = pw;
+ struct s3c_adc_client *client = adc->cur;
+ unsigned long flags;
+ unsigned data0, data1;
+
+ if (!client) {
+ dev_warn(&adc->pdev->dev, "%s: no adc pending\n", __func__);
+ goto exit;
+ }
+
+ data0 = readl(adc->regs + S3C2410_ADCDAT0);
+ data1 = readl(adc->regs + S3C2410_ADCDAT1);
+ adc_dbg(adc, "read %d: 0x%04x, 0x%04x\n", client->nr_samples, data0, data1);
+
+ client->nr_samples--;
+
+ if (client->convert_cb)
+ (client->convert_cb)(client, data0 & 0x3ff, data1 & 0x3ff,
+ &client->nr_samples);
+
+ if (client->nr_samples > 0) {
+ /* fire another conversion for this */
+
+ client->select_cb(client, 1);
+ s3c_adc_convert(adc);
+ } else {
+ local_irq_save(flags);
+ (client->select_cb)(client, 0);
+ adc->cur = NULL;
+
+ s3c_adc_try(adc);
+ local_irq_restore(flags);
+ }
+
+exit:
+ if(adc->pd->adc_type == 1)
+ writel(0, adc->regs + S3C6410_ADCCLRI);
+
+ return IRQ_HANDLED;
+}
+
+static int s3c_adc_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct s3c_adc_platdata *pd;
+ struct adc_device *adc;
+ struct resource *regs;
+ int ret;
+
+ pd = pdev->dev.platform_data;
+ if (!pd) {
+ dev_err(dev, "no platform data specified\n");
+ return -EINVAL;
+ }
+
+ adc = kzalloc(sizeof(struct adc_device), GFP_KERNEL);
+ if (adc == NULL) {
+ dev_err(dev, "failed to allocate adc_device\n");
+ return -ENOMEM;
+ }
+
+ adc->pdev = pdev;
+ adc->pd = pd;
+ adc->prescale = S3C2410_ADCCON_PRSCVL(49);
+
+ adc->irq = platform_get_irq(pdev, 1);
+ if (adc->irq <= 0) {
+ dev_err(dev, "failed to get adc irq\n");
+ ret = -ENOENT;
+ goto err_alloc;
+ }
+
+ ret = request_irq(adc->irq, s3c_adc_irq, 0, dev_name(dev), adc);
+ if (ret < 0) {
+ dev_err(dev, "failed to attach adc irq\n");
+ goto err_alloc;
+ }
+
+ adc->clk = clk_get(dev, "adc");
+ if (IS_ERR(adc->clk)) {
+ dev_err(dev, "failed to get adc clock\n");
+ ret = PTR_ERR(adc->clk);
+ goto err_irq;
+ }
+
+ regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!regs) {
+ dev_err(dev, "failed to find registers\n");
+ ret = -ENXIO;
+ goto err_clk;
+ }
+
+ adc->regs = ioremap(regs->start, resource_size(regs));
+ if (!adc->regs) {
+ dev_err(dev, "failed to map registers\n");
+ ret = -ENXIO;
+ goto err_clk;
+ }
+
+ clk_enable(adc->clk);
+
+ writel(adc->prescale | S3C2410_ADCCON_PRSCEN,
+ adc->regs + S3C2410_ADCCON);
+
+ dev_info(dev, "attached adc driver\n");
+
+ platform_set_drvdata(pdev, adc);
+ adc_dev = adc;
+
+ return 0;
+
+ err_clk:
+ clk_put(adc->clk);
+
+ err_irq:
+ free_irq(adc->irq, adc);
+
+ err_alloc:
+ kfree(adc);
+ return ret;
+}
+
+static int s3c_adc_remove(struct platform_device *pdev)
+{
+ struct adc_device *adc = platform_get_drvdata(pdev);
+
+ iounmap(adc->regs);
+ free_irq(adc->irq, adc);
+ clk_disable(adc->clk);
+ clk_put(adc->clk);
+ kfree(adc);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static int s3c_adc_suspend(struct platform_device *pdev, pm_message_t state)
+{
+ struct adc_device *adc = platform_get_drvdata(pdev);
+ u32 con;
+
+ con = readl(adc->regs + S3C2410_ADCCON);
+ con |= S3C2410_ADCCON_STDBM;
+ writel(con, adc->regs + S3C2410_ADCCON);
+
+ clk_disable(adc->clk);
+
+ return 0;
+}
+
+static int s3c_adc_resume(struct platform_device *pdev)
+{
+ struct adc_device *adc = platform_get_drvdata(pdev);
+
+ clk_enable(adc->clk);
+
+ writel(adc->prescale | S3C2410_ADCCON_PRSCEN,
+ adc->regs + S3C2410_ADCCON);
+
+ return 0;
+}
+
+#else
+#define s3c_adc_suspend NULL
+#define s3c_adc_resume NULL
+#endif
+
+static struct platform_driver s3c_adc_driver = {
+ .driver = {
+ .name = "s3c-adc",
+ .owner = THIS_MODULE,
+ },
+ .probe = s3c_adc_probe,
+ .remove = __devexit_p(s3c_adc_remove),
+ .suspend = s3c_adc_suspend,
+ .resume = s3c_adc_resume,
+};
+
+static int __init adc_init(void)
+{
+ int ret;
+
+ ret = platform_driver_register(&s3c_adc_driver);
+ if (ret)
+ printk(KERN_ERR "%s: failed to add adc driver\n", __func__);
+
+ return ret;
+}
+
+arch_initcall(adc_init);
diff --git a/arch/arm/plat-s3c/include/plat/adc.h
b/arch/arm/plat-s3c/include/plat/adc.h
index 5f3b1cd..a8c9f27 100644
--- a/arch/arm/plat-s3c/include/plat/adc.h
+++ b/arch/arm/plat-s3c/include/plat/adc.h
@@ -4,7 +4,7 @@
* http://armlinux.simnte.co.uk/
* Ben Dooks <ben at simtec.co.uk>
*
- * S3C24XX ADC driver information
+ * S3C ADC driver information
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
@@ -14,6 +14,10 @@
#ifndef __ASM_PLAT_ADC_H
#define __ASM_PLAT_ADC_H __FILE__
+struct s3c_adc_platdata {
+ int adc_type;
+};
+
struct s3c_adc_client;
extern int s3c_adc_start(struct s3c_adc_client *client,
diff --git a/arch/arm/plat-s3c/include/plat/regs-adc.h
b/arch/arm/plat-s3c/include/plat/regs-adc.h
index 4323ccc..933ba79 100644
--- a/arch/arm/plat-s3c/include/plat/regs-adc.h
+++ b/arch/arm/plat-s3c/include/plat/regs-adc.h
@@ -19,6 +19,8 @@
#define S3C2410_ADCDLY S3C2410_ADCREG(0x08)
#define S3C2410_ADCDAT0 S3C2410_ADCREG(0x0C)
#define S3C2410_ADCDAT1 S3C2410_ADCREG(0x10)
+#define S3C6410_ADCCLRI S3C2410_ADCREG(0x18)
+#define S3C6410_ADCCIDU S3C2410_ADCREG(0x20)
/* ADCCON Register Bits */
diff --git a/arch/arm/plat-s3c24xx/Kconfig b/arch/arm/plat-s3c24xx/Kconfig
index 9c7aca4..c402ed9 100644
--- a/arch/arm/plat-s3c24xx/Kconfig
+++ b/arch/arm/plat-s3c24xx/Kconfig
@@ -119,13 +119,6 @@ config S3C2410_DMA_DEBUG
Enable debugging output for the DMA code. This option sends info
to the kernel log, at priority KERN_DEBUG.
-config S3C24XX_ADC
- bool "ADC common driver support"
- help
- Core support for the ADC block found in the S3C24XX SoC systems
- for drivers such as the touchscreen and hwmon to use to share
- this resource.
-
# SPI default pin configuration code
config S3C24XX_SPI_BUS0_GPE11_GPE12_GPE13
diff --git a/arch/arm/plat-s3c24xx/Makefile b/arch/arm/plat-s3c24xx/Makefile
index 7780d2d..a2cb87b 100644
--- a/arch/arm/plat-s3c24xx/Makefile
+++ b/arch/arm/plat-s3c24xx/Makefile
@@ -38,7 +38,6 @@ obj-$(CONFIG_PM) += irq-pm.o
obj-$(CONFIG_PM) += sleep.o
obj-$(CONFIG_S3C2410_CLOCK) += s3c2410-clock.o
obj-$(CONFIG_S3C2410_DMA) += dma.o
-obj-$(CONFIG_S3C24XX_ADC) += adc.o
obj-$(CONFIG_S3C2410_IOTIMING) += s3c2410-iotiming.o
obj-$(CONFIG_S3C2412_IOTIMING) += s3c2412-iotiming.o
obj-$(CONFIG_S3C2410_CPUFREQ_UTILS) += s3c2410-cpufreq-utils.o
diff --git a/arch/arm/plat-s3c24xx/adc.c b/arch/arm/plat-s3c24xx/adc.c
deleted file mode 100644
index 11117a7..0000000
--- a/arch/arm/plat-s3c24xx/adc.c
+++ /dev/null
@@ -1,434 +0,0 @@
-/* arch/arm/plat-s3c24xx/adc.c
- *
- * Copyright (c) 2008 Simtec Electronics
- * http://armlinux.simtec.co.uk/
- * Ben Dooks <ben at simtec.co.uk>, <ben-linux at fluff.org>
- *
- * S3C24XX ADC device core
- *
- * 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.
-*/
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/platform_device.h>
-#include <linux/list.h>
-#include <linux/err.h>
-#include <linux/clk.h>
-#include <linux/interrupt.h>
-#include <linux/io.h>
-
-#include <plat/regs-adc.h>
-#include <plat/adc.h>
-
-/* This driver is designed to control the usage of the ADC block between
- * the touchscreen and any other drivers that may need to use it, such as
- * the hwmon driver.
- *
- * Priority will be given to the touchscreen driver, but as this itself is
- * rate limited it should not starve other requests which are processed in
- * order that they are received.
- *
- * Each user registers to get a client block which uniquely identifies it
- * and stores information such as the necessary functions to callback when
- * action is required.
- */
-
-struct s3c_adc_client {
- struct platform_device *pdev;
- struct list_head pend;
- wait_queue_head_t *wait;
-
- unsigned int nr_samples;
- int result;
- unsigned char is_ts;
- unsigned char channel;
-
- void (*select_cb)(struct s3c_adc_client *c, unsigned selected);
- void (*convert_cb)(struct s3c_adc_client *c,
- unsigned val1, unsigned val2,
- unsigned *samples_left);
-};
-
-struct adc_device {
- struct platform_device *pdev;
- struct platform_device *owner;
- struct clk *clk;
- struct s3c_adc_client *cur;
- struct s3c_adc_client *ts_pend;
- void __iomem *regs;
-
- unsigned int prescale;
-
- int irq;
-};
-
-static struct adc_device *adc_dev;
-
-static LIST_HEAD(adc_pending);
-
-#define adc_dbg(_adc, msg...) dev_dbg(&(_adc)->pdev->dev, msg)
-
-static inline void s3c_adc_convert(struct adc_device *adc)
-{
- unsigned con = readl(adc->regs + S3C2410_ADCCON);
-
- con |= S3C2410_ADCCON_ENABLE_START;
- writel(con, adc->regs + S3C2410_ADCCON);
-}
-
-static inline void s3c_adc_select(struct adc_device *adc,
- struct s3c_adc_client *client)
-{
- unsigned con = readl(adc->regs + S3C2410_ADCCON);
-
- client->select_cb(client, 1);
-
- con &= ~S3C2410_ADCCON_MUXMASK;
- con &= ~S3C2410_ADCCON_STDBM;
- con &= ~S3C2410_ADCCON_STARTMASK;
-
- if (!client->is_ts)
- con |= S3C2410_ADCCON_SELMUX(client->channel);
-
- writel(con, adc->regs + S3C2410_ADCCON);
-}
-
-static void s3c_adc_dbgshow(struct adc_device *adc)
-{
- adc_dbg(adc, "CON=%08x, TSC=%08x, DLY=%08x\n",
- readl(adc->regs + S3C2410_ADCCON),
- readl(adc->regs + S3C2410_ADCTSC),
- readl(adc->regs + S3C2410_ADCDLY));
-}
-
-static void s3c_adc_try(struct adc_device *adc)
-{
- struct s3c_adc_client *next = adc->ts_pend;
-
- if (!next && !list_empty(&adc_pending)) {
- next = list_first_entry(&adc_pending,
- struct s3c_adc_client, pend);
- list_del(&next->pend);
- } else
- adc->ts_pend = NULL;
-
- if (next) {
- adc_dbg(adc, "new client is %p\n", next);
- adc->cur = next;
- s3c_adc_select(adc, next);
- s3c_adc_convert(adc);
- s3c_adc_dbgshow(adc);
- }
-}
-
-int s3c_adc_start(struct s3c_adc_client *client,
- unsigned int channel, unsigned int nr_samples)
-{
- struct adc_device *adc = adc_dev;
- unsigned long flags;
-
- if (!adc) {
- printk(KERN_ERR "%s: failed to find adc\n", __func__);
- return -EINVAL;
- }
-
- if (client->is_ts && adc->ts_pend)
- return -EAGAIN;
-
- local_irq_save(flags);
-
- client->channel = channel;
- client->nr_samples = nr_samples;
-
- if (client->is_ts)
- adc->ts_pend = client;
- else
- list_add_tail(&client->pend, &adc_pending);
-
- if (!adc->cur)
- s3c_adc_try(adc);
- local_irq_restore(flags);
-
- return 0;
-}
-EXPORT_SYMBOL_GPL(s3c_adc_start);
-
-static void s3c_convert_done(struct s3c_adc_client *client,
- unsigned v, unsigned u, unsigned *left)
-{
- client->result = v;
- wake_up(client->wait);
-}
-
-int s3c_adc_read(struct s3c_adc_client *client, unsigned int ch)
-{
- DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wake);
- int ret;
-
- client->convert_cb = s3c_convert_done;
- client->wait = &wake;
- client->result = -1;
-
- ret = s3c_adc_start(client, ch, 1);
- if (ret < 0)
- goto err;
-
- ret = wait_event_timeout(wake, client->result >= 0, HZ / 2);
- if (client->result < 0) {
- ret = -ETIMEDOUT;
- goto err;
- }
-
- client->convert_cb = NULL;
- return client->result;
-
-err:
- return ret;
-}
-EXPORT_SYMBOL_GPL(s3c_adc_convert);
-
-static void s3c_adc_default_select(struct s3c_adc_client *client,
- unsigned select)
-{
-}
-
-struct s3c_adc_client *s3c_adc_register(struct platform_device *pdev,
- void (*select)(struct s3c_adc_client *client,
- unsigned int selected),
- void (*conv)(struct s3c_adc_client *client,
- unsigned d0, unsigned d1,
- unsigned *samples_left),
- unsigned int is_ts)
-{
- struct s3c_adc_client *client;
-
- WARN_ON(!pdev);
-
- if (!select)
- select = s3c_adc_default_select;
-
- if (!pdev)
- return ERR_PTR(-EINVAL);
-
- client = kzalloc(sizeof(struct s3c_adc_client), GFP_KERNEL);
- if (!client) {
- dev_err(&pdev->dev, "no memory for adc client\n");
- return ERR_PTR(-ENOMEM);
- }
-
- client->pdev = pdev;
- client->is_ts = is_ts;
- client->select_cb = select;
- client->convert_cb = conv;
-
- return client;
-}
-EXPORT_SYMBOL_GPL(s3c_adc_register);
-
-void s3c_adc_release(struct s3c_adc_client *client)
-{
- /* We should really check that nothing is in progress. */
- if (adc_dev->cur == client)
- adc_dev->cur = NULL;
- if (adc_dev->ts_pend == client)
- adc_dev->ts_pend = NULL;
- else {
- struct list_head *p, *n;
- struct s3c_adc_client *tmp;
-
- list_for_each_safe(p, n, &adc_pending) {
- tmp = list_entry(p, struct s3c_adc_client, pend);
- if (tmp == client)
- list_del(&tmp->pend);
- }
- }
-
- if (adc_dev->cur == NULL)
- s3c_adc_try(adc_dev);
- kfree(client);
-}
-EXPORT_SYMBOL_GPL(s3c_adc_release);
-
-static irqreturn_t s3c_adc_irq(int irq, void *pw)
-{
- struct adc_device *adc = pw;
- struct s3c_adc_client *client = adc->cur;
- unsigned long flags;
- unsigned data0, data1;
-
- if (!client) {
- dev_warn(&adc->pdev->dev, "%s: no adc pending\n", __func__);
- return IRQ_HANDLED;
- }
-
- data0 = readl(adc->regs + S3C2410_ADCDAT0);
- data1 = readl(adc->regs + S3C2410_ADCDAT1);
- adc_dbg(adc, "read %d: 0x%04x, 0x%04x\n", client->nr_samples, data0, data1);
-
- client->nr_samples--;
-
- if (client->convert_cb)
- (client->convert_cb)(client, data0 & 0x3ff, data1 & 0x3ff,
- &client->nr_samples);
-
- if (client->nr_samples > 0) {
- /* fire another conversion for this */
-
- client->select_cb(client, 1);
- s3c_adc_convert(adc);
- } else {
- local_irq_save(flags);
- (client->select_cb)(client, 0);
- adc->cur = NULL;
-
- s3c_adc_try(adc);
- local_irq_restore(flags);
- }
-
- return IRQ_HANDLED;
-}
-
-static int s3c_adc_probe(struct platform_device *pdev)
-{
- struct device *dev = &pdev->dev;
- struct adc_device *adc;
- struct resource *regs;
- int ret;
-
- adc = kzalloc(sizeof(struct adc_device), GFP_KERNEL);
- if (adc == NULL) {
- dev_err(dev, "failed to allocate adc_device\n");
- return -ENOMEM;
- }
-
- adc->pdev = pdev;
- adc->prescale = S3C2410_ADCCON_PRSCVL(49);
-
- adc->irq = platform_get_irq(pdev, 1);
- if (adc->irq <= 0) {
- dev_err(dev, "failed to get adc irq\n");
- ret = -ENOENT;
- goto err_alloc;
- }
-
- ret = request_irq(adc->irq, s3c_adc_irq, 0, dev_name(dev), adc);
- if (ret < 0) {
- dev_err(dev, "failed to attach adc irq\n");
- goto err_alloc;
- }
-
- adc->clk = clk_get(dev, "adc");
- if (IS_ERR(adc->clk)) {
- dev_err(dev, "failed to get adc clock\n");
- ret = PTR_ERR(adc->clk);
- goto err_irq;
- }
-
- regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!regs) {
- dev_err(dev, "failed to find registers\n");
- ret = -ENXIO;
- goto err_clk;
- }
-
- adc->regs = ioremap(regs->start, resource_size(regs));
- if (!adc->regs) {
- dev_err(dev, "failed to map registers\n");
- ret = -ENXIO;
- goto err_clk;
- }
-
- clk_enable(adc->clk);
-
- writel(adc->prescale | S3C2410_ADCCON_PRSCEN,
- adc->regs + S3C2410_ADCCON);
-
- dev_info(dev, "attached adc driver\n");
-
- platform_set_drvdata(pdev, adc);
- adc_dev = adc;
-
- return 0;
-
- err_clk:
- clk_put(adc->clk);
-
- err_irq:
- free_irq(adc->irq, adc);
-
- err_alloc:
- kfree(adc);
- return ret;
-}
-
-static int s3c_adc_remove(struct platform_device *pdev)
-{
- struct adc_device *adc = platform_get_drvdata(pdev);
-
- iounmap(adc->regs);
- free_irq(adc->irq, adc);
- clk_disable(adc->clk);
- clk_put(adc->clk);
- kfree(adc);
-
- return 0;
-}
-
-#ifdef CONFIG_PM
-static int s3c_adc_suspend(struct platform_device *pdev, pm_message_t state)
-{
- struct adc_device *adc = platform_get_drvdata(pdev);
- u32 con;
-
- con = readl(adc->regs + S3C2410_ADCCON);
- con |= S3C2410_ADCCON_STDBM;
- writel(con, adc->regs + S3C2410_ADCCON);
-
- clk_disable(adc->clk);
-
- return 0;
-}
-
-static int s3c_adc_resume(struct platform_device *pdev)
-{
- struct adc_device *adc = platform_get_drvdata(pdev);
-
- clk_enable(adc->clk);
-
- writel(adc->prescale | S3C2410_ADCCON_PRSCEN,
- adc->regs + S3C2410_ADCCON);
-
- return 0;
-}
-
-#else
-#define s3c_adc_suspend NULL
-#define s3c_adc_resume NULL
-#endif
-
-static struct platform_driver s3c_adc_driver = {
- .driver = {
- .name = "s3c24xx-adc",
- .owner = THIS_MODULE,
- },
- .probe = s3c_adc_probe,
- .remove = __devexit_p(s3c_adc_remove),
- .suspend = s3c_adc_suspend,
- .resume = s3c_adc_resume,
-};
-
-static int __init adc_init(void)
-{
- int ret;
-
- ret = platform_driver_register(&s3c_adc_driver);
- if (ret)
- printk(KERN_ERR "%s: failed to add adc driver\n", __func__);
-
- return ret;
-}
-
-arch_initcall(adc_init);
diff --git a/arch/arm/plat-s3c24xx/devs.c b/arch/arm/plat-s3c24xx/devs.c
index f52a92c..1b131e3 100644
--- a/arch/arm/plat-s3c24xx/devs.c
+++ b/arch/arm/plat-s3c24xx/devs.c
@@ -33,6 +33,7 @@
#include <plat/regs-serial.h>
#include <plat/udc.h>
+#include <plat/adc.h>
#include <plat/devs.h>
#include <plat/cpu.h>
#include <plat/regs-spi.h>
@@ -321,11 +322,16 @@ static struct resource s3c_adc_resource[] = {
};
+static struct s3c_adc_platdata s3c_adc_pdata = {
+ .adc_type = 0,
+};
+
struct platform_device s3c_device_adc = {
- .name = "s3c24xx-adc",
- .id = -1,
- .num_resources = ARRAY_SIZE(s3c_adc_resource),
- .resource = s3c_adc_resource,
+ .name = "s3c-adc",
+ .id = -1,
+ .num_resources = ARRAY_SIZE(s3c_adc_resource),
+ .resource = s3c_adc_resource,
+ .dev.platform_data = &s3c_adc_pdata,
};
/* HWMON */
diff --git a/arch/arm/plat-s3c64xx/Makefile b/arch/arm/plat-s3c64xx/Makefile
index b85b435..8060017 100644
--- a/arch/arm/plat-s3c64xx/Makefile
+++ b/arch/arm/plat-s3c64xx/Makefile
@@ -35,6 +35,10 @@ obj-$(CONFIG_PM) += irq-pm.o
obj-$(CONFIG_S3C64XX_DMA) += dma.o
+# ADC support
+
+obj-$(CONFIG_S3C_ADC) += dev-adc.o
+
# Device setup
obj-$(CONFIG_S3C64XX_SETUP_I2C0) += setup-i2c0.o
diff --git a/arch/arm/plat-s3c64xx/dev-adc.c b/arch/arm/plat-s3c64xx/dev-adc.c
new file mode 100644
index 0000000..5861ab3
--- /dev/null
+++ b/arch/arm/plat-s3c64xx/dev-adc.c
@@ -0,0 +1,51 @@
+/* linux/arch/arm/plat-s3c64xx/dev-adc.c
+ *
+ * Copyright 2009 Maurus Cuelenaere
+ *
+ * S3C64xx series device definition for ADC device
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/platform_device.h>
+
+#include <mach/irqs.h>
+#include <mach/map.h>
+
+#include <plat/adc.h>
+#include <plat/devs.h>
+#include <plat/cpu.h>
+
+static struct resource s3c_adc_resource[] = {
+ [0] = {
+ .start = S3C64XX_PA_ADC,
+ .end = S3C64XX_PA_ADC + SZ_256 - 1,
+ .flags = IORESOURCE_MEM,
+ },
+ [1] = {
+ .start = IRQ_TC,
+ .end = IRQ_TC,
+ .flags = IORESOURCE_IRQ,
+ },
+ [2] = {
+ .start = IRQ_ADC,
+ .end = IRQ_ADC,
+ .flags = IORESOURCE_IRQ,
+ },
+};
+
+static struct s3c_adc_platdata s3c_adc_pdata = {
+ .adc_type = 1,
+};
+
+struct platform_device s3c_device_adc = {
+ .name = "s3c-adc",
+ .id = -1,
+ .num_resources = ARRAY_SIZE(s3c_adc_resource),
+ .resource = s3c_adc_resource,
+ .dev.platform_data = &s3c_adc_pdata,
+};
--
1.6.3.3
More information about the linux-arm-kernel
mailing list