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Code

n810bm: Implement more ADC basics

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git-svn-id: svn://svn.openwrt.org/openwrt/trunk@25222 3c298f89-4303-0410-b956-a3cf2f4a3e73
This commit is contained in:
mb 2011-01-28 22:45:37 +00:00
parent 80f4d42164
commit 6570a252af
1 changed files with 211 additions and 32 deletions
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243
target/linux/omap24xx/patches-2.6.37/900-n810-battery-management.patch
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@ -12,9 +12,9 @@
Index: linux-2.6.37/drivers/cbus/Kconfig
===================================================================
--- linux-2.6.37.orig/drivers/cbus/Kconfig 2011-01-28 18:14:27.901372343 +0100
+++ linux-2.6.37/drivers/cbus/Kconfig 2011-01-28 18:14:27.952363634 +0100
@@ -94,4 +94,16 @@
--- linux-2.6.37.orig/drivers/cbus/Kconfig 2011-01-28 22:33:39.703215389 +0100
+++ linux-2.6.37/drivers/cbus/Kconfig 2011-01-28 23:41:57.094298060 +0100
@@ -94,4 +94,12 @@
to Retu/Vilma. Detection state and events are exposed through
sysfs.
@ -24,17 +24,13 @@ Index: linux-2.6.37/drivers/cbus/Kconfig
+ ---help---
+ Nokia n810 device battery management.
+
+ WARNING: This driver is based on reverse engineered information.
+ It is possibly dangerous to use this software.
+ Use this software at your own risk!
+
+ If unsure, say N.
+
endmenu
Index: linux-2.6.37/drivers/cbus/Makefile
===================================================================
--- linux-2.6.37.orig/drivers/cbus/Makefile 2011-01-28 18:14:27.891374053 +0100
+++ linux-2.6.37/drivers/cbus/Makefile 2011-01-28 18:14:27.952363634 +0100
--- linux-2.6.37.orig/drivers/cbus/Makefile 2011-01-28 22:33:39.694216931 +0100
+++ linux-2.6.37/drivers/cbus/Makefile 2011-01-28 22:33:39.754206648 +0100
@@ -12,3 +12,6 @@
obj-$(CONFIG_CBUS_TAHVO_USER) += tahvo-user.o
obj-$(CONFIG_CBUS_RETU_USER) += retu-user.o
@ -45,16 +41,16 @@ Index: linux-2.6.37/drivers/cbus/Makefile
Index: linux-2.6.37/drivers/cbus/n810bm_main.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.37/drivers/cbus/n810bm_main.c 2011-01-28 18:14:27.952363634 +0100
@@ -0,0 +1,397 @@
+++ linux-2.6.37/drivers/cbus/n810bm_main.c 2011-01-28 23:41:23.510064352 +0100
@@ -0,0 +1,562 @@
+/*
+ * Nokia n810 battery management
+ *
+ * WARNING: This driver is based on reverse engineered information.
+ * WARNING: This driver is based on unconfirmed documentation.
+ * It is possibly dangerous to use this software.
+ * Use this software at your own risk!
+ *
+ * Copyright (c) 2010 Michael Buesch <mb@bu3sch.de>
+ * Copyright (c) 2010-2011 Michael Buesch <mb@bu3sch.de>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
@ -84,10 +80,6 @@ Index: linux-2.6.37/drivers/cbus/n810bm_main.c
+#define N810BM_MIN_VOLTAGE_THRES 3300 /* Absolute minimum voltage threshold */
+
+
+/* Battery related retu ADC channels */
+#define RETU_ADC_BSI 0x01 /* Battery Size Indicator */
+#define RETU_ADC_BATTVOLT 0x08 /* Battery voltage measurement */
+
+/* RETU_ADC_BSI
+ * The battery size indicator ADC measures the resistance between
+ * the battery BSI pin and ground. This is used to detect the battery
@ -222,6 +214,42 @@ Index: linux-2.6.37/drivers/cbus/n810bm_main.c
+ return value;
+}
+
+static int adc_sanity_check(struct n810bm *bm, unsigned int channel)
+{
+ int value;
+
+ value = retu_read_adc(channel);
+ if (value < 0) {
+ dev_err(&bm->pdev->dev, "Failed to read GND ADC channel %u",
+ channel);
+ return -EIO;
+ }
+ dev_info(&bm->pdev->dev,
+ "GND ADC channel %u sanity check got value: %d",
+ channel, value);
+ if (value > 5) {
+ n810bm_emergency(bm, "GND ADC sanity check failed");
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static int n810bm_check_adc_sanity(struct n810bm *bm)
+{
+ int err;
+
+ /* Discard one conversion */
+ retu_write(bm, RETU_REG_ADCSCR, 0);
+ retu_read_adc(RETU_ADC_GND2);
+
+ err = adc_sanity_check(bm, RETU_ADC_GND2);
+ if (err)
+ return err;
+
+ return 0;
+}
+
+/* Measure the battery voltage. Returns the value in mV (or negative value on error). */
+static int n810bm_measure_batt_voltage(struct n810bm *bm)
+{
@ -239,6 +267,51 @@ Index: linux-2.6.37/drivers/cbus/n810bm_main.c
+ return mv;
+}
+
+/* Measure the charger voltage. Returns the value in mV (or negative value on error). */
+static int n810bm_measure_charger_voltage(struct n810bm *bm)
+{
+ int adc;
+ unsigned int mv;
+
+ adc = retu_adc_average(bm, RETU_ADC_CHGVOLT, 5);
+ if (adc < 0)
+ return adc;
+ //TODO convert to mV
+ mv = adc;
+
+ return mv;
+}
+
+/* Measure backup battery voltage. Returns the value in mV (or negative value on error). */
+static int n810bm_measure_backup_batt_voltage(struct n810bm *bm)
+{
+ int adc;
+ unsigned int mv;
+
+ adc = retu_adc_average(bm, RETU_ADC_BKUPVOLT, 3);
+ if (adc < 0)
+ return adc;
+ //TODO convert to mV
+ mv = adc;
+
+ return mv;
+}
+
+/* Measure the battery temperature. Returns the value in K (or negative value on error). */
+static int n810bm_measure_batt_temp(struct n810bm *bm)
+{
+ int adc;
+ unsigned int k;
+
+ adc = retu_adc_average(bm, RETU_ADC_BATTEMP, 3);
+ if (adc < 0)
+ return adc;
+ //TODO convert to K
+ k = adc;
+
+ return k;
+}
+
+/* Read the battery capacity via BSI pin. */
+static enum n810bm_capacity n810bm_read_batt_capacity(struct n810bm *bm)
+{
@ -294,7 +367,7 @@ Index: linux-2.6.37/drivers/cbus/n810bm_main.c
+
+static void n810bm_adc_irq_handler(unsigned long data)
+{
+ struct n810bm *bm = (struct n810bm *)data;
+// struct n810bm *bm = (struct n810bm *)data;
+
+ retu_ack_irq(RETU_INT_ADCS);
+ //TODO
@ -341,6 +414,69 @@ Index: linux-2.6.37/drivers/cbus/n810bm_main.c
+}
+static DEVICE_ATTR(batt_capacity, 0444, n810bm_attr_capacity_show, NULL);
+
+static ssize_t n810bm_attr_battemp_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct n810bm *bm = platform_get_drvdata(pdev);
+ ssize_t count = 0;
+ int k, err = -ENODEV;
+
+ spin_lock_irq(&bm->lock);
+ k = n810bm_measure_batt_temp(bm);
+ if (k >= 0) {
+ count = snprintf(buf, PAGE_SIZE, "%d\n", k);
+ err = 0;
+ }
+ spin_unlock_irq(&bm->lock);
+
+ return err ? err : count;
+}
+static DEVICE_ATTR(batt_temp, 0444, n810bm_attr_battemp_show, NULL);
+
+static ssize_t n810bm_attr_charger_voltage(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct n810bm *bm = platform_get_drvdata(pdev);
+ ssize_t count = 0;
+ int mv, err = -ENODEV;
+
+ spin_lock_irq(&bm->lock);
+ mv = n810bm_measure_charger_voltage(bm);
+ if (mv >= 0) {
+ count = snprintf(buf, PAGE_SIZE, "%d\n", mv);
+ err = 0;
+ }
+ spin_unlock_irq(&bm->lock);
+
+ return err ? err : count;
+}
+static DEVICE_ATTR(charger_voltage, 0444, n810bm_attr_charger_voltage, NULL);
+
+static ssize_t n810bm_attr_backup_batt_voltage(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct n810bm *bm = platform_get_drvdata(pdev);
+ ssize_t count = 0;
+ int mv, err = -ENODEV;
+
+ spin_lock_irq(&bm->lock);
+ mv = n810bm_measure_backup_batt_voltage(bm);
+ if (mv >= 0) {
+ count = snprintf(buf, PAGE_SIZE, "%d\n", mv);
+ err = 0;
+ }
+ spin_unlock_irq(&bm->lock);
+
+ return err ? err : count;
+}
+static DEVICE_ATTR(backup_batt_voltage, 0444, n810bm_attr_backup_batt_voltage, NULL);
+
+static void n810bm_hw_exit(struct n810bm *bm)
+{
+ retu_write(bm, RETU_REG_ADCSCR, 0);
@ -348,17 +484,24 @@ Index: linux-2.6.37/drivers/cbus/n810bm_main.c
+
+static int n810bm_hw_init(struct n810bm *bm)
+{
+ retu_write(bm, RETU_REG_ADCSCR, 0);
+ int err;
+
+ err = n810bm_check_adc_sanity(bm);
+ if (err)
+ goto error;
+ bm->capacity = n810bm_read_batt_capacity(bm);
+ if (bm->capacity == N810BM_CAP_UNKNOWN) {
+ dev_err(&bm->pdev->dev, "Unknown battery detected");
+ return -ENODEV;
+ err = -ENODEV;
+ goto error;
+ }
+ dev_info(&bm->pdev->dev, "Detected %u mAh battery\n",
+ (unsigned int)bm->capacity);
+
+ return 0;
+
+error:
+ return err;
+}
+
+static int __devinit n810bm_probe(struct platform_device *pdev)
@ -383,10 +526,19 @@ Index: linux-2.6.37/drivers/cbus/n810bm_main.c
+ err = device_create_file(&pdev->dev, &dev_attr_batt_capacity);
+ if (err)
+ goto err_rem_charge;
+ err = device_create_file(&pdev->dev, &dev_attr_batt_temp);
+ if (err)
+ goto err_rem_capa;
+ err = device_create_file(&pdev->dev, &dev_attr_charger_voltage);
+ if (err)
+ goto err_rem_temp;
+ err = device_create_file(&pdev->dev, &dev_attr_backup_batt_voltage);
+ if (err)
+ goto err_rem_chg;
+ err = retu_request_irq(RETU_INT_ADCS, n810bm_adc_irq_handler,
+ (unsigned long)bm, "n810bm");
+ if (err)
+ goto err_rem_capa;
+ goto err_rem_bkup;
+
+ mod_timer(&bm->check_timer, round_jiffies(jiffies + N810BM_CHECK_INTERVAL));
+
@ -394,6 +546,12 @@ Index: linux-2.6.37/drivers/cbus/n810bm_main.c
+
+ return 0;
+
+err_rem_bkup:
+ device_remove_file(&pdev->dev, &dev_attr_backup_batt_voltage);
+err_rem_chg:
+ device_remove_file(&pdev->dev, &dev_attr_charger_voltage);
+err_rem_temp:
+ device_remove_file(&pdev->dev, &dev_attr_batt_temp);
+err_rem_capa:
+ device_remove_file(&pdev->dev, &dev_attr_batt_capacity);
+err_rem_charge:
@ -412,6 +570,9 @@ Index: linux-2.6.37/drivers/cbus/n810bm_main.c
+
+ retu_free_irq(RETU_INT_ADCS);
+ del_timer_sync(&bm->check_timer);
+ device_remove_file(&pdev->dev, &dev_attr_backup_batt_voltage);
+ device_remove_file(&pdev->dev, &dev_attr_charger_voltage);
+ device_remove_file(&pdev->dev, &dev_attr_batt_temp);
+ device_remove_file(&pdev->dev, &dev_attr_batt_capacity);
+ device_remove_file(&pdev->dev, &dev_attr_batt_charge);
+ n810bm_hw_exit(bm);
@ -446,8 +607,8 @@ Index: linux-2.6.37/drivers/cbus/n810bm_main.c
+MODULE_AUTHOR("Michael Buesch");
Index: linux-2.6.37/drivers/cbus/retu.c
===================================================================
--- linux-2.6.37.orig/drivers/cbus/retu.c 2011-01-28 18:14:27.892373882 +0100
+++ linux-2.6.37/drivers/cbus/retu.c 2011-01-28 18:14:27.952363634 +0100
--- linux-2.6.37.orig/drivers/cbus/retu.c 2011-01-28 22:33:39.695216760 +0100
+++ linux-2.6.37/drivers/cbus/retu.c 2011-01-28 22:33:39.754206648 +0100
@@ -85,10 +85,10 @@
*
* This function writes a value to the specified register
@ -463,8 +624,8 @@ Index: linux-2.6.37/drivers/cbus/retu.c
void retu_set_clear_reg_bits(int reg, u16 set, u16 clear)
Index: linux-2.6.37/drivers/cbus/retu.h
===================================================================
--- linux-2.6.37.orig/drivers/cbus/retu.h 2011-01-28 18:14:27.892373882 +0100
+++ linux-2.6.37/drivers/cbus/retu.h 2011-01-28 18:14:27.953363463 +0100
--- linux-2.6.37.orig/drivers/cbus/retu.h 2011-01-28 22:33:39.695216760 +0100
+++ linux-2.6.37/drivers/cbus/retu.h 2011-01-28 22:40:55.380584650 +0100
@@ -39,6 +39,7 @@
#define RETU_REG_CC2 0x0e /* Common control register 2 */
#define RETU_REG_CTRL_CLR 0x0f /* Regulator clear register */
@ -473,9 +634,27 @@ Index: linux-2.6.37/drivers/cbus/retu.h
#define RETU_REG_STATUS 0x16 /* Status register */
#define RETU_REG_WATCHDOG 0x17 /* Watchdog register */
#define RETU_REG_AUDTXR 0x18 /* Audio Codec Tx register */
@@ -58,7 +59,7 @@
@@ -57,8 +58,25 @@
#define MAX_RETU_IRQ_HANDLERS 16
+/* ADC channels */
+#define RETU_ADC_GND 0x00 /* Ground */
+#define RETU_ADC_BSI 0x01 /* Battery Size Indicator */
+#define RETU_ADC_BATTEMP 0x02 /* Battery temperature */
+#define RETU_ADC_CHGVOLT 0x03 /* Charger voltage */
+#define RETU_ADC_HEADSET 0x04 /* Headset detection */
+#define RETU_ADC_HOOKDET 0x05 /* Hook detection */
+#define RETU_ADC_RFGP 0x06 /* RF GP */
+#define RETU_ADC_WBTX 0x07 /* Wideband Tx detection */
+#define RETU_ADC_BATTVOLT 0x08 /* Battery voltage measurement */
+#define RETU_ADC_GND2 0x09 /* Ground */
+#define RETU_ADC_LIGHTSENS 0x0A /* Light sensor */
+#define RETU_ADC_LIGHTTEMP 0x0B /* Light sensor temperature */
+#define RETU_ADC_BKUPVOLT 0x0C /* Backup battery voltage */
+#define RETU_ADC_TEMP 0x0D /* RETU temperature */
+
+
int retu_read_reg(int reg);
-void retu_write_reg(int reg, u16 val);
+int retu_write_reg(int reg, u16 val);
@ -484,8 +663,8 @@ Index: linux-2.6.37/drivers/cbus/retu.h
int retu_request_irq(int id, void *irq_handler, unsigned long arg, char *name);
Index: linux-2.6.37/arch/arm/mach-omap2/board-n8x0.c
===================================================================
--- linux-2.6.37.orig/arch/arm/mach-omap2/board-n8x0.c 2011-01-28 18:14:27.876376613 +0100
+++ linux-2.6.37/arch/arm/mach-omap2/board-n8x0.c 2011-01-28 18:14:27.953363463 +0100
--- linux-2.6.37.orig/arch/arm/mach-omap2/board-n8x0.c 2011-01-28 22:33:39.679219500 +0100
+++ linux-2.6.37/arch/arm/mach-omap2/board-n8x0.c 2011-01-28 22:33:39.754206648 +0100
@@ -907,6 +907,17 @@
ARRAY_SIZE(n8x0_gpio_switches));
}
@ -516,7 +695,7 @@ Index: linux-2.6.37/arch/arm/mach-omap2/board-n8x0.c
Index: linux-2.6.37/drivers/cbus/lipocharge.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.37/drivers/cbus/lipocharge.c 2011-01-28 18:14:27.953363463 +0100
+++ linux-2.6.37/drivers/cbus/lipocharge.c 2011-01-28 22:33:39.755206476 +0100
@@ -0,0 +1,63 @@
+/*
+ * Generic LIPO battery charger
@ -584,7 +763,7 @@ Index: linux-2.6.37/drivers/cbus/lipocharge.c
Index: linux-2.6.37/drivers/cbus/lipocharge.h
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.37/drivers/cbus/lipocharge.h 2011-01-28 18:14:27.953363463 +0100
+++ linux-2.6.37/drivers/cbus/lipocharge.h 2011-01-28 22:33:39.755206476 +0100
@@ -0,0 +1,50 @@
+#ifndef LIPOCHARGE_H_
+#define LIPOCHARGE_H_
@ -638,8 +817,8 @@ Index: linux-2.6.37/drivers/cbus/lipocharge.h
+#endif /* LIPOCHARGE_H_ */
Index: linux-2.6.37/drivers/cbus/tahvo.h
===================================================================
--- linux-2.6.37.orig/drivers/cbus/tahvo.h 2011-01-28 18:14:27.893373711 +0100
+++ linux-2.6.37/drivers/cbus/tahvo.h 2011-01-28 18:14:27.953363463 +0100
--- linux-2.6.37.orig/drivers/cbus/tahvo.h 2011-01-28 22:33:39.696216589 +0100
+++ linux-2.6.37/drivers/cbus/tahvo.h 2011-01-28 22:33:39.755206476 +0100
@@ -30,8 +30,14 @@
#define TAHVO_REG_IDR 0x01 /* Interrupt ID */
#define TAHVO_REG_IDSR 0x02 /* Interrupt status */