[PATCH 14/14] mfd: remove unused iPaq micro driver
From: Arnd Bergmann
Date: Wed Sep 09 2026 - 10:03:27 EST
From: Arnd Bergmann <arnd@xxxxxxxx>
The iPaq support has been removed from the kernel, this driver is
no longer used anywhere.
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
---
drivers/mfd/Kconfig | 10 -
drivers/mfd/Makefile | 1 -
drivers/mfd/ipaq-micro.c | 442 ---------------------------------------
3 files changed, 453 deletions(-)
delete mode 100644 drivers/mfd/ipaq-micro.c
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 02e52398fcd2..6189bd7cc109 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -780,16 +780,6 @@ config MFD_INTEL_PMC_BXT
Register and P-unit access. In addition this creates devices
for iTCO watchdog and telemetry that are part of the PMC.
-config MFD_IPAQ_MICRO
- bool "Atmel Micro ASIC (iPAQ h3100/h3600/h3700) Support"
- depends on SA1100_H3600
- select MFD_CORE
- help
- Select this to get support for the Microcontroller found in
- the Compaq iPAQ handheld computers. This is an Atmel
- AT90LS8535 microcontroller flashed with a special iPAQ
- firmware using the custom protocol implemented in this driver.
-
config MFD_IQS62X
tristate "Azoteq IQS620A/621/622/624/625 core support"
depends on I2C
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index a88a13c8bab8..b56ff2e68d4a 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -218,7 +218,6 @@ obj-$(CONFIG_MFD_RETU) += retu-mfd.o
obj-$(CONFIG_MFD_AS3711) += as3711.o
obj-$(CONFIG_MFD_AS3722) += as3722.o
obj-$(CONFIG_MFD_STW481X) += stw481x.o
-obj-$(CONFIG_MFD_IPAQ_MICRO) += ipaq-micro.o
obj-$(CONFIG_MFD_IQS62X) += iqs62x.o
obj-$(CONFIG_MFD_MENF21BMC) += menf21bmc.o
obj-$(CONFIG_MFD_HI6421_PMIC) += hi6421-pmic-core.o
diff --git a/drivers/mfd/ipaq-micro.c b/drivers/mfd/ipaq-micro.c
deleted file mode 100644
index 5146a6eb0e5a..000000000000
--- a/drivers/mfd/ipaq-micro.c
+++ /dev/null
@@ -1,442 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Compaq iPAQ h3xxx Atmel microcontroller companion support
- *
- * This is an Atmel AT90LS8535 with a special flashed-in firmware that
- * implements the special protocol used by this driver.
- *
- * based on previous kernel 2.4 version by Andrew Christian
- * Author : Alessandro Gardich <gremlin@xxxxxxxxxx>
- * Author : Dmitry Artamonow <mad_soft@xxxxxxxx>
- * Author : Linus Walleij <linus.walleij@xxxxxxxxxx>
- */
-
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/interrupt.h>
-#include <linux/pm.h>
-#include <linux/delay.h>
-#include <linux/device.h>
-#include <linux/platform_device.h>
-#include <linux/io.h>
-#include <linux/mfd/core.h>
-#include <linux/mfd/ipaq-micro.h>
-#include <linux/string.h>
-#include <linux/string_choices.h>
-#include <linux/random.h>
-#include <linux/slab.h>
-#include <linux/list.h>
-
-#include <mach/hardware.h>
-
-static void ipaq_micro_trigger_tx(struct ipaq_micro *micro)
-{
- struct ipaq_micro_txdev *tx = µ->tx;
- struct ipaq_micro_msg *msg = micro->msg;
- int i, bp;
- u8 checksum;
- u32 val;
-
- bp = 0;
- tx->buf[bp++] = CHAR_SOF;
-
- checksum = ((msg->id & 0x0f) << 4) | (msg->tx_len & 0x0f);
- tx->buf[bp++] = checksum;
-
- for (i = 0; i < msg->tx_len; i++) {
- tx->buf[bp++] = msg->tx_data[i];
- checksum += msg->tx_data[i];
- }
-
- tx->buf[bp++] = checksum;
- tx->len = bp;
- tx->index = 0;
-
- /* Enable interrupt */
- val = readl(micro->base + UTCR3);
- val |= UTCR3_TIE;
- writel(val, micro->base + UTCR3);
-}
-
-int ipaq_micro_tx_msg(struct ipaq_micro *micro, struct ipaq_micro_msg *msg)
-{
- unsigned long flags;
-
- dev_dbg(micro->dev, "TX msg: %02x, %d bytes\n", msg->id, msg->tx_len);
-
- spin_lock_irqsave(µ->lock, flags);
- if (micro->msg) {
- list_add_tail(&msg->node, µ->queue);
- spin_unlock_irqrestore(µ->lock, flags);
- return 0;
- }
- micro->msg = msg;
- ipaq_micro_trigger_tx(micro);
- spin_unlock_irqrestore(µ->lock, flags);
- return 0;
-}
-EXPORT_SYMBOL(ipaq_micro_tx_msg);
-
-static void micro_rx_msg(struct ipaq_micro *micro, u8 id, int len, u8 *data)
-{
- dev_dbg(micro->dev, "RX msg: %02x, %d bytes\n", id, len);
-
- spin_lock(µ->lock);
- switch (id) {
- case MSG_VERSION:
- case MSG_EEPROM_READ:
- case MSG_EEPROM_WRITE:
- case MSG_BACKLIGHT:
- case MSG_NOTIFY_LED:
- case MSG_THERMAL_SENSOR:
- case MSG_BATTERY:
- /* Handle synchronous messages */
- if (micro->msg && micro->msg->id == id) {
- struct ipaq_micro_msg *msg = micro->msg;
-
- memcpy(msg->rx_data, data, len);
- msg->rx_len = len;
- complete(µ->msg->ack);
- if (!list_empty(µ->queue)) {
- micro->msg = list_entry(micro->queue.next,
- struct ipaq_micro_msg,
- node);
- list_del_init(µ->msg->node);
- ipaq_micro_trigger_tx(micro);
- } else
- micro->msg = NULL;
- dev_dbg(micro->dev, "OK RX message 0x%02x\n", id);
- } else {
- dev_err(micro->dev,
- "out of band RX message 0x%02x\n", id);
- if (!micro->msg)
- dev_info(micro->dev, "no message queued\n");
- else
- dev_info(micro->dev, "expected message %02x\n",
- micro->msg->id);
- }
- break;
- case MSG_KEYBOARD:
- if (micro->key)
- micro->key(micro->key_data, len, data);
- else
- dev_dbg(micro->dev, "key message ignored, no handle\n");
- break;
- case MSG_TOUCHSCREEN:
- if (micro->ts)
- micro->ts(micro->ts_data, len, data);
- else
- dev_dbg(micro->dev, "touchscreen message ignored, no handle\n");
- break;
- default:
- dev_err(micro->dev,
- "unknown msg %d [%d] %*ph\n", id, len, len, data);
- break;
- }
- spin_unlock(µ->lock);
-}
-
-static void micro_process_char(struct ipaq_micro *micro, u8 ch)
-{
- struct ipaq_micro_rxdev *rx = µ->rx;
-
- switch (rx->state) {
- case STATE_SOF: /* Looking for SOF */
- if (ch == CHAR_SOF)
- rx->state = STATE_ID; /* Next byte is the id and len */
- break;
- case STATE_ID: /* Looking for id and len byte */
- rx->id = (ch & 0xf0) >> 4;
- rx->len = (ch & 0x0f);
- rx->index = 0;
- rx->chksum = ch;
- rx->state = (rx->len > 0) ? STATE_DATA : STATE_CHKSUM;
- break;
- case STATE_DATA: /* Looking for 'len' data bytes */
- rx->chksum += ch;
- rx->buf[rx->index] = ch;
- if (++rx->index == rx->len)
- rx->state = STATE_CHKSUM;
- break;
- case STATE_CHKSUM: /* Looking for the checksum */
- if (ch == rx->chksum)
- micro_rx_msg(micro, rx->id, rx->len, rx->buf);
- rx->state = STATE_SOF;
- break;
- }
-}
-
-static void micro_rx_chars(struct ipaq_micro *micro)
-{
- u32 status, ch;
-
- while ((status = readl(micro->base + UTSR1)) & UTSR1_RNE) {
- ch = readl(micro->base + UTDR);
- if (status & UTSR1_PRE)
- dev_err(micro->dev, "rx: parity error\n");
- else if (status & UTSR1_FRE)
- dev_err(micro->dev, "rx: framing error\n");
- else if (status & UTSR1_ROR)
- dev_err(micro->dev, "rx: overrun error\n");
- micro_process_char(micro, ch);
- }
-}
-
-static void ipaq_micro_get_version(struct ipaq_micro *micro)
-{
- struct ipaq_micro_msg msg = {
- .id = MSG_VERSION,
- };
-
- ipaq_micro_tx_msg_sync(micro, &msg);
- if (msg.rx_len == 4) {
- memcpy(micro->version, msg.rx_data, 4);
- micro->version[4] = '\0';
- } else if (msg.rx_len == 9) {
- memcpy(micro->version, msg.rx_data, 4);
- micro->version[4] = '\0';
- /* Bytes 4-7 are "pack", byte 8 is "boot type" */
- } else {
- dev_err(micro->dev,
- "illegal version message %d bytes\n", msg.rx_len);
- }
-}
-
-static void ipaq_micro_eeprom_read(struct ipaq_micro *micro,
- u8 address, u8 len, u8 *data)
-{
- struct ipaq_micro_msg msg = {
- .id = MSG_EEPROM_READ,
- };
- u8 i;
-
- for (i = 0; i < len; i++) {
- msg.tx_data[0] = address + i;
- msg.tx_data[1] = 1;
- msg.tx_len = 2;
- ipaq_micro_tx_msg_sync(micro, &msg);
- memcpy(data + (i * 2), msg.rx_data, 2);
- }
-}
-
-static char *ipaq_micro_str(u8 *wchar, u8 len)
-{
- char retstr[256] = { 0 };
- u8 i;
-
- for (i = 0; i < len / 2; i++)
- retstr[i] = wchar[i * 2];
- return kstrdup(retstr, GFP_KERNEL);
-}
-
-static u16 ipaq_micro_to_u16(u8 *data)
-{
- return data[1] << 8 | data[0];
-}
-
-static void __init ipaq_micro_eeprom_dump(struct ipaq_micro *micro)
-{
- u8 dump[256];
- char *str;
-
- ipaq_micro_eeprom_read(micro, 0, 128, dump);
- str = ipaq_micro_str(dump, 10);
- if (str) {
- dev_info(micro->dev, "HW version %s\n", str);
- kfree(str);
- }
- str = ipaq_micro_str(dump+10, 40);
- if (str) {
- dev_info(micro->dev, "serial number: %s\n", str);
- /* Feed the random pool with this */
- add_device_randomness(str, strlen(str));
- kfree(str);
- }
- str = ipaq_micro_str(dump+50, 20);
- if (str) {
- dev_info(micro->dev, "module ID: %s\n", str);
- kfree(str);
- }
- str = ipaq_micro_str(dump+70, 10);
- if (str) {
- dev_info(micro->dev, "product revision: %s\n", str);
- kfree(str);
- }
- dev_info(micro->dev, "product ID: %u\n", ipaq_micro_to_u16(dump+80));
- dev_info(micro->dev, "frame rate: %u fps\n",
- ipaq_micro_to_u16(dump+82));
- dev_info(micro->dev, "page mode: %u\n", ipaq_micro_to_u16(dump+84));
- dev_info(micro->dev, "country ID: %u\n", ipaq_micro_to_u16(dump+86));
- dev_info(micro->dev, "color display: %s\n",
- str_yes_no(ipaq_micro_to_u16(dump + 88)));
- dev_info(micro->dev, "ROM size: %u MiB\n", ipaq_micro_to_u16(dump+90));
- dev_info(micro->dev, "RAM size: %u KiB\n", ipaq_micro_to_u16(dump+92));
- dev_info(micro->dev, "screen: %u x %u\n",
- ipaq_micro_to_u16(dump+94), ipaq_micro_to_u16(dump+96));
-}
-
-static void micro_tx_chars(struct ipaq_micro *micro)
-{
- struct ipaq_micro_txdev *tx = µ->tx;
- u32 val;
-
- while ((tx->index < tx->len) &&
- (readl(micro->base + UTSR1) & UTSR1_TNF)) {
- writel(tx->buf[tx->index], micro->base + UTDR);
- tx->index++;
- }
-
- /* Stop interrupts */
- val = readl(micro->base + UTCR3);
- val &= ~UTCR3_TIE;
- writel(val, micro->base + UTCR3);
-}
-
-static void micro_reset_comm(struct ipaq_micro *micro)
-{
- struct ipaq_micro_rxdev *rx = µ->rx;
- u32 val;
-
- if (micro->msg)
- complete(µ->msg->ack);
-
- /* Initialize Serial channel protocol frame */
- rx->state = STATE_SOF; /* Reset the state machine */
-
- /* Set up interrupts */
- writel(0x01, micro->sdlc + 0x0); /* Select UART mode */
-
- /* Clean up CR3 */
- writel(0x0, micro->base + UTCR3);
-
- /* Format: 8N1 */
- writel(UTCR0_8BitData | UTCR0_1StpBit, micro->base + UTCR0);
-
- /* Baud rate: 115200 */
- writel(0x0, micro->base + UTCR1);
- writel(0x1, micro->base + UTCR2);
-
- /* Clear SR0 */
- writel(0xff, micro->base + UTSR0);
-
- /* Enable RX int, disable TX int */
- writel(UTCR3_TXE | UTCR3_RXE | UTCR3_RIE, micro->base + UTCR3);
- val = readl(micro->base + UTCR3);
- val &= ~UTCR3_TIE;
- writel(val, micro->base + UTCR3);
-}
-
-static irqreturn_t micro_serial_isr(int irq, void *dev_id)
-{
- struct ipaq_micro *micro = dev_id;
- struct ipaq_micro_txdev *tx = µ->tx;
- u32 status;
-
- status = readl(micro->base + UTSR0);
- do {
- if (status & (UTSR0_RID | UTSR0_RFS)) {
- if (status & UTSR0_RID)
- /* Clear the Receiver IDLE bit */
- writel(UTSR0_RID, micro->base + UTSR0);
- micro_rx_chars(micro);
- }
-
- /* Clear break bits */
- if (status & (UTSR0_RBB | UTSR0_REB))
- writel(status & (UTSR0_RBB | UTSR0_REB),
- micro->base + UTSR0);
-
- if (status & UTSR0_TFS)
- micro_tx_chars(micro);
-
- status = readl(micro->base + UTSR0);
-
- } while (((tx->index < tx->len) && (status & UTSR0_TFS)) ||
- (status & (UTSR0_RFS | UTSR0_RID)));
-
- return IRQ_HANDLED;
-}
-
-static const struct mfd_cell micro_cells[] = {
- { .name = "ipaq-micro-backlight", },
- { .name = "ipaq-micro-battery", },
- { .name = "ipaq-micro-keys", },
- { .name = "ipaq-micro-ts", },
- { .name = "ipaq-micro-leds", },
-};
-
-static int __maybe_unused micro_resume(struct device *dev)
-{
- struct ipaq_micro *micro = dev_get_drvdata(dev);
-
- micro_reset_comm(micro);
- mdelay(10);
-
- return 0;
-}
-
-static int __init micro_probe(struct platform_device *pdev)
-{
- struct ipaq_micro *micro;
- int ret;
- int irq;
-
- micro = devm_kzalloc(&pdev->dev, sizeof(*micro), GFP_KERNEL);
- if (!micro)
- return -ENOMEM;
-
- micro->dev = &pdev->dev;
-
- micro->base = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
- if (IS_ERR(micro->base))
- return PTR_ERR(micro->base);
-
- micro->sdlc = devm_platform_ioremap_resource(pdev, 1);
- if (IS_ERR(micro->sdlc))
- return PTR_ERR(micro->sdlc);
-
- micro_reset_comm(micro);
-
- irq = platform_get_irq(pdev, 0);
- if (irq < 0)
- return -EINVAL;
- ret = devm_request_irq(&pdev->dev, irq, micro_serial_isr,
- IRQF_SHARED, "ipaq-micro",
- micro);
- if (ret) {
- dev_err(&pdev->dev, "unable to grab serial port IRQ\n");
- return ret;
- } else
- dev_info(&pdev->dev, "grabbed serial port IRQ\n");
-
- spin_lock_init(µ->lock);
- INIT_LIST_HEAD(µ->queue);
- platform_set_drvdata(pdev, micro);
-
- ret = mfd_add_devices(&pdev->dev, pdev->id, micro_cells,
- ARRAY_SIZE(micro_cells), NULL, 0, NULL);
- if (ret) {
- dev_err(&pdev->dev, "error adding MFD cells");
- return ret;
- }
-
- /* Check version */
- ipaq_micro_get_version(micro);
- dev_info(&pdev->dev, "Atmel micro ASIC version %s\n", micro->version);
- ipaq_micro_eeprom_dump(micro);
-
- return 0;
-}
-
-static const struct dev_pm_ops micro_dev_pm_ops = {
- SET_SYSTEM_SLEEP_PM_OPS(NULL, micro_resume)
-};
-
-static struct platform_driver micro_device_driver = {
- .driver = {
- .name = "ipaq-h3xxx-micro",
- .pm = µ_dev_pm_ops,
- .suppress_bind_attrs = true,
- },
-};
-builtin_platform_driver_probe(micro_device_driver, micro_probe);
--
2.53.0