Add support for the LOCK_UNLOCK command. This command can lock,
unlock, set password, clear password and force erase SD and
MMC cards.
Signed-off-by: Al Cooper <alcoop...@gmail.com>
---
drivers/mmc/core/mmc_ops.c | 112 +++++++++++++++++++++++++++++++++++++++++++++
drivers/mmc/core/mmc_ops.h | 13 ++++++
include/linux/mmc/card.h | 5 ++
3 files changed, 130 insertions(+)
diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c
index 837fc73..26e37a1 100644
--- a/drivers/mmc/core/mmc_ops.c
+++ b/drivers/mmc/core/mmc_ops.c
@@ -13,6 +13,8 @@
#include <linux/export.h>
#include <linux/types.h>
#include <linux/scatterlist.h>
+#include <linux/key.h>
+#include <linux/err.h>
#include <linux/mmc/host.h>
#include <linux/mmc/card.h>
@@ -606,3 +608,113 @@ int mmc_send_hpi_cmd(struct mmc_card *card, u32 *status)
return 0;
}
+
+#ifdef CONFIG_MMC_LOCK
+/**
+ * mmc_lock_unlock - send LOCK_UNLOCK command to a specific card.
+ * @card: card to which the LOCK_UNLOCK command should be sent
+ * @key: key containing the MMC password
+ * @mode: LOCK_UNLOCK mode
+ *
+ */
+int mmc_lock_unlock(struct mmc_card *card, struct mmc_password *password,
+ int mode)
+{
+ struct mmc_request mrq;
+ struct mmc_command cmd;
+ struct mmc_data data;
+ struct scatterlist sg;
+ unsigned long erase_timeout;
+ int err, data_size;
+ u8 *data_buf;
+
+ data_size = 4;
+ if (!(mode & MMC_LOCK_MODE_ERASE))
+ data_size = 2 + password->length;
+
+ data_buf = kzalloc(data_size, GFP_KERNEL);
+ if (!data_buf)
+ return -ENOMEM;
+ data_buf[0] |= mode;
+ if (!(mode & MMC_LOCK_MODE_ERASE)) {
+ data_buf[1] = password->length;
+ memcpy(data_buf + 2, password->password, password->length);
+ }
+
+ memset(&cmd, 0, sizeof(struct mmc_command));
+ cmd.opcode = MMC_SET_BLOCKLEN;
+ cmd.arg = data_size;
+ cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
+ err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
+ if (err)
+ goto out;
+
+ memset(&cmd, 0, sizeof(struct mmc_command));
+ cmd.opcode = MMC_LOCK_UNLOCK;
+ cmd.arg = 0;
+ cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
+
+ memset(&data, 0, sizeof(struct mmc_data));
+ mmc_set_data_timeout(&data, card);
+ data.blksz = data_size;
+ data.blocks = 1;
+ data.flags = MMC_DATA_WRITE;
+ data.sg = &sg;
+ data.sg_len = 1;
+
+ memset(&mrq, 0, sizeof(struct mmc_request));
+ mrq.cmd = &cmd;
+ mrq.data = &data;
+
+ sg_init_one(&sg, data_buf, data_size);
+ mmc_wait_for_req(card->host, &mrq);
+ if (cmd.error) {
+ err = cmd.error;
+ goto out;
+ }
+ if (data.error) {
+ err = data.error;
+ goto out;
+ }
+
+ memset(&cmd, 0, sizeof(struct mmc_command));
+ cmd.opcode = MMC_SEND_STATUS;
+ cmd.arg = card->rca << 16;
+ cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
+
+ /* set timeout for forced erase operation to 3 min. (see MMC spec) */
+ erase_timeout = jiffies + 180 * HZ;
+ do {
+ /*
+ * we cannot use "retries" here because the
+ * R1_LOCK_UNLOCK_FAILED bit is cleared by subsequent reads to
+ * the status register, hiding the error condition
+ */
+ err = mmc_wait_for_cmd(card->host, &cmd, 0);
+ if (err)
+ break;
+ /* the other modes don't need timeout checking */
+ if (!(mode & MMC_LOCK_MODE_ERASE))
+ continue;
+ if (time_after(jiffies, erase_timeout) &&
+ !(cmd.resp[0] & R1_READY_FOR_DATA)) {
+ dev_err(&card->dev, "forced erase timed out\n");
+ err = -ETIMEDOUT;
+ break;
+ }
+ } while (!(cmd.resp[0] & R1_READY_FOR_DATA));
+ if (cmd.resp[0] & R1_LOCK_UNLOCK_FAILED) {
+ dev_dbg(&card->dev, "LOCK_UNLOCK operation failed\n");
+ err = -EIO;
+ }
+ if (cmd.resp[0] & R1_CARD_IS_LOCKED)
+ mmc_card_set_locked(card);
+ else
+ mmc_card_clear_locked(card);
+
+out:
+ kfree(data_buf);
+
+ return err;
+}
+#endif /* CONFIG_MMC_LOCK */
diff --git a/drivers/mmc/core/mmc_ops.h b/drivers/mmc/core/mmc_ops.h
index 80ae9f4..5fe50e0 100644
--- a/drivers/mmc/core/mmc_ops.h
+++ b/drivers/mmc/core/mmc_ops.h
@@ -12,6 +12,15 @@
#ifndef _MMC_MMC_OPS_H
#define _MMC_MMC_OPS_H
+/*
+ * MMC_LOCK_UNLOCK modes
+ */
+#define MMC_LOCK_MODE_ERASE (1<<3)
+#define MMC_LOCK_MODE_LOCK (1<<2)
+#define MMC_LOCK_MODE_UNLOCK (0<<2)
+#define MMC_LOCK_MODE_CLR_PWD (1<<1)
+#define MMC_LOCK_MODE_SET_PWD (1<<0)
+
int mmc_select_card(struct mmc_card *card);
int mmc_deselect_cards(struct mmc_host *host);
int mmc_go_idle(struct mmc_host *host);
@@ -26,6 +35,10 @@ int mmc_spi_read_ocr(struct mmc_host *host, int highcap, u32
*ocrp);
int mmc_spi_set_crc(struct mmc_host *host, int use_crc);
int mmc_bus_test(struct mmc_card *card, u8 bus_width);
int mmc_send_hpi_cmd(struct mmc_card *card, u32 *status);
+#ifdef CONFIG_MMC_LOCK
+int mmc_lock_unlock(struct mmc_card *card, struct mmc_password *password,
+ int mode);
+#endif
#endif
diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
index 842de3e..af92c44 100644
--- a/include/linux/mmc/card.h
+++ b/include/linux/mmc/card.h
@@ -257,6 +257,7 @@ struct mmc_card {
#define MMC_CARD_REMOVED (1<<7) /* card has been removed */
#define MMC_STATE_HIGHSPEED_200 (1<<8) /* card is in HS200
mode */
#define MMC_STATE_DOING_BKOPS (1<<10) /* card is doing BKOPS */
+#define MMC_STATE_LOCKED (1<<11) /* card is currently locked */
unsigned int quirks; /* card quirks */
#define MMC_QUIRK_LENIENT_FN0 (1<<0) /* allow SDIO FN0 writes
outside of the VS CCCR range */
#define MMC_QUIRK_BLKSZ_FOR_BYTE_MODE (1<<1) /* use func->cur_blksize */
@@ -424,6 +425,8 @@ static inline void __maybe_unused remove_quirk(struct
mmc_card *card, int data)
#define mmc_card_ext_capacity(c) ((c)->state & MMC_CARD_SDXC)
#define mmc_card_removed(c) ((c) && ((c)->state & MMC_CARD_REMOVED))
#define mmc_card_doing_bkops(c) ((c)->state & MMC_STATE_DOING_BKOPS)
+#define mmc_card_locked(c) ((c)->state & MMC_STATE_LOCKED)
+#define mmc_card_lockable(c) ((c)->csd.cmdclass & CCC_LOCK_CARD)
#define mmc_card_set_present(c) ((c)->state |= MMC_STATE_PRESENT)
#define mmc_card_set_readonly(c) ((c)->state |= MMC_STATE_READONLY)
@@ -437,6 +440,8 @@ static inline void __maybe_unused remove_quirk(struct
mmc_card *card, int data)
#define mmc_card_set_removed(c) ((c)->state |= MMC_CARD_REMOVED)
#define mmc_card_set_doing_bkops(c) ((c)->state |= MMC_STATE_DOING_BKOPS)
#define mmc_card_clr_doing_bkops(c) ((c)->state &= ~MMC_STATE_DOING_BKOPS)
+#define mmc_card_set_locked(c) ((c)->state |= MMC_STATE_LOCKED)
+#define mmc_card_clear_locked(c) ((c)->state &= ~MMC_STATE_LOCKED)
/*
* Quirk add/remove for MMC products.
--
1.8.1.3
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