This patch allows platform configurations to share information about
the NTC thermistor device attached to ADC port of S3C.
A platform configuration is required to initialize the ADC port for NTC
thermistor by calling "s3c_adc_ntc_init(portnum);" before registering
the NTC thermistor device. Then, registering a platform device,
s3c_device_adc_ntc_thermistor, enables NTC thermistor for the
platform.
The platform data is configured for Exynos4-Nuri, S5PC110-Aquila, and
S5PC110-Goni. However, if a board happens to have different platform
data setting, we will need to provide different platform data either
by providing a function to update the platform data or by providing
another platform data entry.
Signed-off-by: MyungJoo Ham <myungjoo.ham@xxxxxxxxxxx>
Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
---
arch/arm/plat-samsung/dev-adc.c | 57 +++++++++++++++++++++++++++++
arch/arm/plat-samsung/include/plat/devs.h | 1 +
2 files changed, 58 insertions(+), 0 deletions(-)
diff --git a/arch/arm/plat-samsung/dev-adc.c b/arch/arm/plat-samsung/dev-adc.c
index 9d903d4..622972c 100644
--- a/arch/arm/plat-samsung/dev-adc.c
+++ b/arch/arm/plat-samsung/dev-adc.c
@@ -9,9 +9,11 @@
* published by the Free Software Foundation.
*/
+#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/platform_device.h>
+#include <linux/platform_data/ntc_thermistor.h>
#include <mach/irqs.h>
#include <mach/map.h>
@@ -44,3 +46,58 @@ struct platform_device s3c_device_adc = {
.num_resources = ARRAY_SIZE(s3c_adc_resource),
.resource = s3c_adc_resource,
};
+
+/* NTC Thermistor. Attached to S3C-ADC in some Samsung SoC Devices */
+struct platform_device s3c_device_adc_ntc_thermistor;
+static int ntc_adc_num = -EINVAL; /* Uninitialized */
+static struct s3c_adc_client *ntc_adc;
+
+int __init s3c_adc_ntc_init(int port)
+{
+ int err = 0;
+
+ if (port < 0 || port > 9)
+ return -EINVAL;
+ ntc_adc_num = port;
+
+ ntc_adc = s3c_adc_register(&s3c_device_adc_ntc_thermistor, NULL, NULL,
+ 0);
+ if (IS_ERR(ntc_adc)) {
+ err = PTR_ERR(ntc_adc);
+ ntc_adc = NULL;
+ return err;
+ }
+
+ return 0;
+}
+
+static int read_thermistor_uV(void)
+{
+ int val;
+ s64 converted;
+
+ WARN(ntc_adc == NULL || ntc_adc_num < 0,
+ "S3C NTC-ADC is not initialized for %s.\n", __func__);
+
+ val = s3c_adc_read(ntc_adc, ntc_adc_num);
+
+ converted = 3300000LL * (s64) val;
+ converted >>= 12;
+
+ return converted;
+}
+
+static struct ntc_thermistor_platform_data ntc_adc_pdata = {
+ .read_uV = read_thermistor_uV,
+ .pullup_uV = 3300000, /* voltage of vdd for ADC */
+ .pullup_ohm = 100000,
+ .pulldown_ohm = 100000,
+ .connect = NTC_CONNECTED_GROUND,
+};
+
+struct platform_device s3c_device_adc_ntc_thermistor = {
+ .name = "ncp15wb473",
+ .dev = {
+ .platform_data = &ntc_adc_pdata,
+ },
+};
diff --git a/arch/arm/plat-samsung/include/plat/devs.h b/arch/arm/plat-samsung/include/plat/devs.h
index 3c87779..f83b1da 100644
--- a/arch/arm/plat-samsung/include/plat/devs.h
+++ b/arch/arm/plat-samsung/include/plat/devs.h
@@ -61,6 +61,7 @@ extern struct platform_device s3c_device_i2c6;
extern struct platform_device s3c_device_i2c7;
extern struct platform_device s3c_device_rtc;
extern struct platform_device s3c_device_adc;
+extern struct platform_device s3c_device_adc_ntc_thermistor;
extern struct platform_device s3c_device_sdi;
extern struct platform_device s3c_device_iis;
extern struct platform_device s3c_device_hwmon;
--
1.7.4.1
--
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