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70 lines
2.4 KiB
Diff
70 lines
2.4 KiB
Diff
From f96aab45a604cb0f46a6ca3aa286a821c2462fda Mon Sep 17 00:00:00 2001
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From: Andy Green <andy@openmoko.com>
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Date: Sun, 13 Jul 2008 20:30:31 +0100
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Subject: [PATCH] add-pcf50633-allow-force-charger-type.patch
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This patch adds a sysfs node:
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/sys/class/i2c-adapter/i2c-0/0-0073/force_usb_limit_dangerous
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it allows to force the charging limit regardless of the one chosen
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by pcf50633 kernel driver. As such, if you write a charging limit
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here that is not suitable for the power source, and the power source
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is not current limited on its side, it could draw more current than
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your power source can handle, burn down you house, etc.
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If you're certain that your power supply can handle it, you can use
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this on your own responsibility to make the amount drawn by the
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PMU match what you believed your power supply could handle.
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Example usage, in case where you have a dumb 500mA USB charger that
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does not have the ID resistor:
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# cat /sys/class/i2c-adapter/i2c-0/0-0073/charger_type
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host/500mA usb mode 100mA <=== dumb charger does not ennumerate us
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# echo 500 > /sys/class/i2c-adapter/i2c-0/0-0073/force_usb_limit_dangerous
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# cat /sys/class/i2c-adapter/i2c-0/0-0073/charger_type
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host/500mA usb mode 500mA
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Signed-off-by: Andy Green <andy@openmoko.com>
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---
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drivers/i2c/chips/pcf50633.c | 15 +++++++++++++++
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1 files changed, 15 insertions(+), 0 deletions(-)
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diff --git a/drivers/i2c/chips/pcf50633.c b/drivers/i2c/chips/pcf50633.c
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index a116f9f..9f98ba1 100644
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--- a/drivers/i2c/chips/pcf50633.c
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+++ b/drivers/i2c/chips/pcf50633.c
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@@ -1953,6 +1953,20 @@ static ssize_t show_charger_type(struct device *dev,
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static DEVICE_ATTR(charger_type, 0444, show_charger_type, NULL);
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+static ssize_t force_usb_limit_dangerous(struct device *dev,
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+ struct device_attribute *attr, const char *buf, size_t count)
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+{
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+ struct i2c_client *client = to_i2c_client(dev);
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+ struct pcf50633_data *pcf = i2c_get_clientdata(client);
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+ int ma = simple_strtoul(buf, NULL, 10);
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+
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+ pcf50633_usb_curlim_set(pcf, ma);
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+ return count;
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+}
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+
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+static DEVICE_ATTR(force_usb_limit_dangerous, 0600,
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+ NULL, force_usb_limit_dangerous);
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+
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/*
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* Charger adc
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*/
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@@ -2030,6 +2044,7 @@ static struct attribute *pcf_sysfs_entries[] = {
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&dev_attr_voltage_ldo6.attr,
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&dev_attr_voltage_hcldo.attr,
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&dev_attr_charger_type.attr,
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+ &dev_attr_force_usb_limit_dangerous.attr,
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&dev_attr_charger_adc.attr,
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&dev_attr_dump_regs.attr,
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NULL, /* going to add things at this point! */
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--
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1.5.6.5
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