69 lines
1.7 KiB
Diff
69 lines
1.7 KiB
Diff
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From 0d735a912f70dbc9a7e3d806456a597b6f0dfe97 Mon Sep 17 00:00:00 2001
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From: Ondrej Jirman <megous@megous.com>
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Date: Mon, 23 Nov 2020 02:42:46 +0100
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Subject: [PATCH 189/351] Allow to block userpsace from controlling the modem
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power driver
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For p-boot privacy switch.
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Signed-off-by: Ondrej Jirman <megous@megous.com>
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---
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drivers/misc/modem-power.c | 13 +++++++++++++
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1 file changed, 13 insertions(+)
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diff --git a/drivers/misc/modem-power.c b/drivers/misc/modem-power.c
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index 1f5bfe104463..9afa64ce0c15 100644
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--- a/drivers/misc/modem-power.c
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+++ b/drivers/misc/modem-power.c
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@@ -179,6 +179,7 @@ enum {
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/* config options */
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MPWR_F_DUMB_POWERUP,
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MPWR_F_FASTBOOT_POWERUP,
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+ MPWR_F_BLOCKED,
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/* file */
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MPWR_F_OPEN,
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MPWR_F_OVERFLOW,
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@@ -1188,6 +1189,9 @@ static ssize_t powered_store(struct device *dev,
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bool status;
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int ret;
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+ if (test_bit(MPWR_F_BLOCKED, mpwr->flags))
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+ return -EPERM;
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+
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ret = kstrtobool(buf, &status);
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if (ret)
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return ret;
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@@ -1205,6 +1209,9 @@ static ssize_t powered_blocking_store(struct device *dev,
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bool status;
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int ret;
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+ if (test_bit(MPWR_F_BLOCKED, mpwr->flags))
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+ return -EPERM;
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+
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ret = kstrtobool(buf, &status);
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if (ret)
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return ret;
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@@ -1311,6 +1318,9 @@ static ssize_t hard_reset_store(struct device *dev,
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bool val;
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int ret;
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+ if (test_bit(MPWR_F_BLOCKED, mpwr->flags))
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+ return -EPERM;
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+
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ret = kstrtobool(buf, &val);
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if (ret)
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return ret;
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@@ -1400,6 +1410,9 @@ static int mpwr_probe_generic(struct device *dev, struct mpwr_dev **mpwr_out)
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return -EINVAL;
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}
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+ if (of_property_read_bool(np, "blocked"))
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+ set_bit(MPWR_F_BLOCKED, mpwr->flags);
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+
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mpwr->status_pwrkey_multiplexed =
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of_property_read_bool(np, "status-pwrkey-multiplexed");
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--
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2.34.0
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