// SPDX-License-Identifier: GPL-2.0-or-later
/*
- * Chassis LCD/LED driver for HP-PARISC workstations
+ * Chassis LCD/LED driver for HP-PARISC workstations
*
- * (c) Copyright 2000 Red Hat Software
- * (c) Copyright 2000 Helge Deller <hdeller@redhat.com>
- * (c) Copyright 2001-2009 Helge Deller <deller@gmx.de>
- * (c) Copyright 2001 Randolph Chung <tausq@debian.org>
+ * (c) Copyright 2000 Red Hat Software
+ * (c) Copyright 2000 Helge Deller <hdeller@redhat.com>
+ * (c) Copyright 2001 Randolph Chung <tausq@debian.org>
+ * (c) Copyright 2000-2023 Helge Deller <deller@gmx.de>
*
- * TODO:
- * - speed-up calculations with inlined assembler
- * - interface to write to second row of LCD from /proc (if technically possible)
+ * The control of the LEDs and LCDs on PARISC machines has to be done
+ * completely in software.
*
- * Changes:
- * - Audit copy_from_user in led_proc_write.
- * Daniele Bellucci <bellucda@tiscali.it>
- * - Switch from using a tasklet to a work queue, so the led_LCD_driver
- * can sleep.
- * David Pye <dmp@davidmpye.dyndns.org>
+ * The LEDs can be configured at runtime in /sys/class/leds/
*/
#include <linux/module.h>
-#include <linux/stddef.h> /* for offsetof() */
#include <linux/init.h>
#include <linux/types.h>
#include <linux/ioport.h>
#include <linux/utsname.h>
#include <linux/capability.h>
#include <linux/delay.h>
-#include <linux/netdevice.h>
-#include <linux/inetdevice.h>
-#include <linux/in.h>
-#include <linux/interrupt.h>
-#include <linux/kernel_stat.h>
#include <linux/reboot.h>
-#include <linux/proc_fs.h>
-#include <linux/seq_file.h>
-#include <linux/ctype.h>
-#include <linux/blkdev.h>
-#include <linux/workqueue.h>
-#include <linux/rcupdate.h>
+#include <linux/uaccess.h>
+#include <linux/leds.h>
+#include <linux/platform_device.h>
+
#include <asm/io.h>
#include <asm/processor.h>
#include <asm/hardware.h>
#include <asm/param.h> /* HZ */
#include <asm/led.h>
#include <asm/pdc.h>
-#include <linux/uaccess.h>
-
-/* The control of the LEDs and LCDs on PARISC-machines have to be done
- completely in software. The necessary calculations are done in a work queue
- task which is scheduled regularly, and since the calculations may consume a
- relatively large amount of CPU time, some of the calculations can be
- turned off with the following variables (controlled via procfs) */
-static int led_type __read_mostly = -1;
-static unsigned char lastleds; /* LED state from most recent update */
-static unsigned int led_heartbeat __read_mostly = 1;
-static unsigned int led_diskio __read_mostly;
-static unsigned int led_lanrxtx __read_mostly;
-static char lcd_text[32] __read_mostly;
-static char lcd_text_default[32] __read_mostly;
-static int lcd_no_led_support __read_mostly = 0; /* KittyHawk doesn't support LED on its LCD */
+#define LED_HAS_LCD 1
+#define LED_HAS_LED 2
-
-static struct workqueue_struct *led_wq;
-static void led_work_func(struct work_struct *);
-static DECLARE_DELAYED_WORK(led_task, led_work_func);
-
-#if 0
-#define DPRINTK(x) printk x
-#else
-#define DPRINTK(x)
-#endif
+static unsigned char led_type; /* bitmask of LED_HAS_XXX */
+static unsigned char lastleds; /* LED state from most recent update */
+static unsigned char lcd_new_text;
+static unsigned char lcd_text[20];
+static unsigned char lcd_text_default[20];
+static unsigned char lcd_no_led_support; /* KittyHawk doesn't support LED on its LCD */
struct lcd_block {
unsigned char command; /* stores the command byte */
};
/* Structure returned by PDC_RETURN_CHASSIS_INFO */
-/* NOTE: we use unsigned long:16 two times, since the following member
+/* NOTE: we use unsigned long:16 two times, since the following member
lcd_cmd_reg_addr needs to be 64bit aligned on 64bit PA2.0-machines */
struct pdc_chassis_lcd_info_ret_block {
unsigned long model:16; /* DISPLAY_MODEL_XXXX */
/* LCD_CMD and LCD_DATA for KittyHawk machines */
-#define KITTYHAWK_LCD_CMD F_EXTEND(0xf0190000UL) /* 64bit-ready */
-#define KITTYHAWK_LCD_DATA (KITTYHAWK_LCD_CMD+1)
+#define KITTYHAWK_LCD_CMD F_EXTEND(0xf0190000UL)
+#define KITTYHAWK_LCD_DATA (KITTYHAWK_LCD_CMD + 1)
-/* lcd_info is pre-initialized to the values needed to program KittyHawk LCD's
+/* lcd_info is pre-initialized to the values needed to program KittyHawk LCD's
* HP seems to have used Sharp/Hitachi HD44780 LCDs most of the time. */
static struct pdc_chassis_lcd_info_ret_block
-lcd_info __attribute__((aligned(8))) __read_mostly =
+lcd_info __attribute__((aligned(8))) =
{
- .model = DISPLAY_MODEL_LCD,
+ .model = DISPLAY_MODEL_NONE,
.lcd_width = 16,
.lcd_cmd_reg_addr = KITTYHAWK_LCD_CMD,
.lcd_data_reg_addr = KITTYHAWK_LCD_DATA,
.reset_cmd2 = 0xc0,
};
-
/* direct access to some of the lcd_info variables */
-#define LCD_CMD_REG lcd_info.lcd_cmd_reg_addr
-#define LCD_DATA_REG lcd_info.lcd_data_reg_addr
+#define LCD_CMD_REG lcd_info.lcd_cmd_reg_addr
+#define LCD_DATA_REG lcd_info.lcd_data_reg_addr
#define LED_DATA_REG lcd_info.lcd_cmd_reg_addr /* LASI & ASP only */
-#define LED_HASLCD 1
-#define LED_NOLCD 0
-
-/* The workqueue must be created at init-time */
-static int start_task(void)
-{
- /* Display the default text now */
- if (led_type == LED_HASLCD) lcd_print( lcd_text_default );
-
- /* KittyHawk has no LED support on its LCD */
- if (lcd_no_led_support) return 0;
-
- /* Create the work queue and queue the LED task */
- led_wq = create_singlethread_workqueue("led_wq");
- if (!led_wq)
- return -ENOMEM;
-
- queue_delayed_work(led_wq, &led_task, 0);
-
- return 0;
-}
-
-device_initcall(start_task);
-
/* ptr to LCD/LED-specific function */
-static void (*led_func_ptr) (unsigned char) __read_mostly;
-
-#ifdef CONFIG_PROC_FS
-static int led_proc_show(struct seq_file *m, void *v)
-{
- switch ((long)m->private)
- {
- case LED_NOLCD:
- seq_printf(m, "Heartbeat: %d\n", led_heartbeat);
- seq_printf(m, "Disk IO: %d\n", led_diskio);
- seq_printf(m, "LAN Rx/Tx: %d\n", led_lanrxtx);
- break;
- case LED_HASLCD:
- seq_printf(m, "%s\n", lcd_text);
- break;
- default:
- return 0;
- }
- return 0;
-}
-
-static int led_proc_open(struct inode *inode, struct file *file)
-{
- return single_open(file, led_proc_show, pde_data(inode));
-}
+static void (*led_func_ptr) (unsigned char);
-static ssize_t led_proc_write(struct file *file, const char __user *buf,
- size_t count, loff_t *pos)
+static void lcd_print_now(void)
{
- void *data = pde_data(file_inode(file));
- char *cur, lbuf[32];
- int d;
-
- if (!capable(CAP_SYS_ADMIN))
- return -EACCES;
-
- if (count >= sizeof(lbuf))
- count = sizeof(lbuf)-1;
-
- if (copy_from_user(lbuf, buf, count))
- return -EFAULT;
- lbuf[count] = 0;
-
- cur = lbuf;
-
- switch ((long)data)
- {
- case LED_NOLCD:
- d = *cur++ - '0';
- if (d != 0 && d != 1) goto parse_error;
- led_heartbeat = d;
-
- if (*cur++ != ' ') goto parse_error;
+ int i;
+ char *str = lcd_text;
- d = *cur++ - '0';
- if (d != 0 && d != 1) goto parse_error;
- led_diskio = d;
+ if (lcd_info.model != DISPLAY_MODEL_LCD)
+ return;
- if (*cur++ != ' ') goto parse_error;
+ if (!lcd_new_text)
+ return;
+ lcd_new_text = 0;
- d = *cur++ - '0';
- if (d != 0 && d != 1) goto parse_error;
- led_lanrxtx = d;
+ /* Set LCD Cursor to 1st character */
+ gsc_writeb(lcd_info.reset_cmd1, LCD_CMD_REG);
+ udelay(lcd_info.min_cmd_delay);
- break;
- case LED_HASLCD:
- if (*cur && cur[strlen(cur)-1] == '\n')
- cur[strlen(cur)-1] = 0;
- if (*cur == 0)
- cur = lcd_text_default;
- lcd_print(cur);
- break;
- default:
- return 0;
+ /* Print the string */
+ for (i = 0; i < lcd_info.lcd_width; i++) {
+ gsc_writeb(*str ? *str++ : ' ', LCD_DATA_REG);
+ udelay(lcd_info.min_cmd_delay);
}
-
- return count;
-
-parse_error:
- if ((long)data == LED_NOLCD)
- printk(KERN_CRIT "Parse error: expect \"n n n\" (n == 0 or 1) for heartbeat,\ndisk io and lan tx/rx indicators\n");
- return -EINVAL;
}
-static const struct proc_ops led_proc_ops = {
- .proc_open = led_proc_open,
- .proc_read = seq_read,
- .proc_lseek = seq_lseek,
- .proc_release = single_release,
- .proc_write = led_proc_write,
-};
-
-static int __init led_create_procfs(void)
+/**
+ * lcd_print()
+ *
+ * @str: string to show on the LCD. If NULL, print current string again.
+ *
+ * Displays the given string on the LCD-Display of newer machines.
+ */
+void lcd_print(const char *str)
{
- struct proc_dir_entry *proc_pdc_root = NULL;
- struct proc_dir_entry *ent;
-
- if (led_type == -1) return -1;
-
- proc_pdc_root = proc_mkdir("pdc", NULL);
- if (!proc_pdc_root) return -1;
-
- if (!lcd_no_led_support)
- {
- ent = proc_create_data("led", 0644, proc_pdc_root,
- &led_proc_ops, (void *)LED_NOLCD); /* LED */
- if (!ent) return -1;
- }
-
- if (led_type == LED_HASLCD)
- {
- ent = proc_create_data("lcd", 0644, proc_pdc_root,
- &led_proc_ops, (void *)LED_HASLCD); /* LCD */
- if (!ent) return -1;
- }
+ /* copy display string to buffer for procfs */
+ if (str)
+ strscpy(lcd_text, str, sizeof(lcd_text));
+ lcd_new_text = 1;
- return 0;
+ /* print now if LCD without any LEDs */
+ if (led_type == LED_HAS_LCD)
+ lcd_print_now();
}
-#endif
-/*
- **
- ** led_ASP_driver()
- **
- */
#define LED_DATA 0x01 /* data to shift (0:on 1:off) */
#define LED_STROBE 0x02 /* strobe to clock data */
+
+/**
+ * led_ASP_driver() - LED driver for the ASP controller chip
+ *
+ * @leds: bitmap representing the LED status
+ */
static void led_ASP_driver(unsigned char leds)
{
int i;
}
}
-
-/*
- **
- ** led_LASI_driver()
- **
+/**
+ * led_LASI_driver() - LED driver for the LASI controller chip
+ *
+ * @leds: bitmap representing the LED status
*/
static void led_LASI_driver(unsigned char leds)
{
gsc_writeb( leds, LED_DATA_REG );
}
-
-/*
- **
- ** led_LCD_driver()
- **
+/**
+ * led_LCD_driver() - LED & LCD driver for LCD chips
+ *
+ * @leds: bitmap representing the LED status
*/
static void led_LCD_driver(unsigned char leds)
{
- static int i;
- static unsigned char mask[4] = { LED_HEARTBEAT, LED_DISK_IO,
+ static const unsigned char mask[4] = {
+ LED_HEARTBEAT, LED_DISK_IO,
LED_LAN_RCV, LED_LAN_TX };
-
- static struct lcd_block * blockp[4] = {
+
+ static struct lcd_block * const blockp[4] = {
&lcd_info.heartbeat,
&lcd_info.disk_io,
&lcd_info.lan_rcv,
&lcd_info.lan_tx
};
+ static unsigned char latest_leds;
+ int i;
- /* Convert min_cmd_delay to milliseconds */
- unsigned int msec_cmd_delay = 1 + (lcd_info.min_cmd_delay / 1000);
-
- for (i=0; i<4; ++i)
- {
- if ((leds & mask[i]) != (lastleds & mask[i]))
- {
- gsc_writeb( blockp[i]->command, LCD_CMD_REG );
- msleep(msec_cmd_delay);
-
- gsc_writeb( leds & mask[i] ? blockp[i]->on :
- blockp[i]->off, LCD_DATA_REG );
- msleep(msec_cmd_delay);
- }
+ for (i = 0; i < 4; ++i) {
+ if ((leds & mask[i]) == (latest_leds & mask[i]))
+ continue;
+
+ gsc_writeb( blockp[i]->command, LCD_CMD_REG );
+ udelay(lcd_info.min_cmd_delay);
+
+ gsc_writeb( leds & mask[i] ? blockp[i]->on :
+ blockp[i]->off, LCD_DATA_REG );
+ udelay(lcd_info.min_cmd_delay);
}
+ latest_leds = leds;
+
+ lcd_print_now();
}
-/*
- **
- ** led_get_net_activity()
- **
- ** calculate if there was TX- or RX-throughput on the network interfaces
- ** (analog to dev_get_info() from net/core/dev.c)
- **
+/**
+ * lcd_system_halt()
+ *
+ * @nb: pointer to the notifier_block structure
+ * @event: the event (SYS_RESTART, SYS_HALT or SYS_POWER_OFF)
+ * @buf: pointer to a buffer (not used)
+ *
+ * Called by the reboot notifier chain at shutdown. Stops all
+ * LED/LCD activities.
*/
-static __inline__ int led_get_net_activity(void)
-{
-#ifndef CONFIG_NET
- return 0;
-#else
- static u64 rx_total_last, tx_total_last;
- u64 rx_total, tx_total;
- struct net_device *dev;
- int retval;
-
- rx_total = tx_total = 0;
-
- /* we are running as a workqueue task, so we can use an RCU lookup */
- rcu_read_lock();
- for_each_netdev_rcu(&init_net, dev) {
- const struct rtnl_link_stats64 *stats;
- struct rtnl_link_stats64 temp;
- struct in_device *in_dev = __in_dev_get_rcu(dev);
- if (!in_dev || !in_dev->ifa_list)
- continue;
- if (ipv4_is_loopback(in_dev->ifa_list->ifa_local))
- continue;
- stats = dev_get_stats(dev, &temp);
- rx_total += stats->rx_packets;
- tx_total += stats->tx_packets;
- }
- rcu_read_unlock();
-
- retval = 0;
+static int lcd_system_halt(struct notifier_block *nb, unsigned long event, void *buf)
+{
+ const char *txt;
- if (rx_total != rx_total_last) {
- rx_total_last = rx_total;
- retval |= LED_LAN_RCV;
+ switch (event) {
+ case SYS_RESTART: txt = "SYSTEM RESTART";
+ break;
+ case SYS_HALT: txt = "SYSTEM HALT";
+ break;
+ case SYS_POWER_OFF: txt = "SYSTEM POWER OFF";
+ break;
+ default: return NOTIFY_DONE;
}
- if (tx_total != tx_total_last) {
- tx_total_last = tx_total;
- retval |= LED_LAN_TX;
- }
+ lcd_print(txt);
- return retval;
-#endif
+ return NOTIFY_OK;
}
+static struct notifier_block lcd_system_halt_notifier = {
+ .notifier_call = lcd_system_halt,
+};
-/*
- **
- ** led_get_diskio_activity()
- **
- ** calculate if there was disk-io in the system
- **
- */
-static __inline__ int led_get_diskio_activity(void)
-{
- static unsigned long last_pgpgin, last_pgpgout;
- unsigned long events[NR_VM_EVENT_ITEMS];
- int changed;
-
- all_vm_events(events);
-
- /* Just use a very simple calculation here. Do not care about overflow,
- since we only want to know if there was activity or not. */
- changed = (events[PGPGIN] != last_pgpgin) ||
- (events[PGPGOUT] != last_pgpgout);
- last_pgpgin = events[PGPGIN];
- last_pgpgout = events[PGPGOUT];
-
- return (changed ? LED_DISK_IO : 0);
-}
-
+static void set_led(struct led_classdev *led_cdev, enum led_brightness brightness);
+struct hppa_led {
+ struct led_classdev led_cdev;
+ unsigned char led_bit;
+};
+#define to_hppa_led(d) container_of(d, struct hppa_led, led_cdev)
-/*
- ** led_work_func()
- **
- ** manages when and which chassis LCD/LED gets updated
+typedef void (*set_handler)(struct led_classdev *, enum led_brightness);
+struct led_type {
+ const char *name;
+ set_handler handler;
+ const char *default_trigger;
+};
- TODO:
- - display load average (older machines like 715/64 have 4 "free" LED's for that)
- - optimizations
- */
+#define NUM_LEDS_PER_BOARD 8
+struct hppa_drvdata {
+ struct hppa_led leds[NUM_LEDS_PER_BOARD];
+};
-#define HEARTBEAT_LEN (HZ*10/100)
-#define HEARTBEAT_2ND_RANGE_START (HZ*28/100)
-#define HEARTBEAT_2ND_RANGE_END (HEARTBEAT_2ND_RANGE_START + HEARTBEAT_LEN)
+static void set_led(struct led_classdev *led_cdev, enum led_brightness brightness)
+{
+ struct hppa_led *p = to_hppa_led(led_cdev);
+ unsigned char led_bit = p->led_bit;
-#define LED_UPDATE_INTERVAL (1 + (HZ*19/1000))
+ if (brightness == LED_OFF)
+ lastleds &= ~led_bit;
+ else
+ lastleds |= led_bit;
-static void led_work_func (struct work_struct *unused)
-{
- static unsigned long last_jiffies;
- static unsigned long count_HZ; /* counter in range 0..HZ */
- unsigned char currentleds = 0; /* stores current value of the LEDs */
+ if (led_func_ptr)
+ led_func_ptr(lastleds);
+}
- /* exit if not initialized */
- if (!led_func_ptr)
- return;
- /* increment the heartbeat timekeeper */
- count_HZ += jiffies - last_jiffies;
- last_jiffies = jiffies;
- if (count_HZ >= HZ)
- count_HZ = 0;
+static int hppa_led_generic_probe(struct platform_device *pdev,
+ struct led_type *types)
+{
+ struct hppa_drvdata *p;
+ int i, err;
- if (likely(led_heartbeat))
- {
- /* flash heartbeat-LED like a real heart
- * (2 x short then a long delay)
- */
- if (count_HZ < HEARTBEAT_LEN ||
- (count_HZ >= HEARTBEAT_2ND_RANGE_START &&
- count_HZ < HEARTBEAT_2ND_RANGE_END))
- currentleds |= LED_HEARTBEAT;
- }
+ p = devm_kzalloc(&pdev->dev, sizeof(*p), GFP_KERNEL);
+ if (!p)
+ return -ENOMEM;
- if (likely(led_lanrxtx)) currentleds |= led_get_net_activity();
- if (likely(led_diskio)) currentleds |= led_get_diskio_activity();
-
- /* blink LEDs if we got an Oops (HPMC) */
- if (unlikely(oops_in_progress)) {
- if (boot_cpu_data.cpu_type >= pcxl2) {
- /* newer machines don't have loadavg. LEDs, so we
- * let all LEDs blink twice per second instead */
- currentleds = (count_HZ <= (HZ/2)) ? 0 : 0xff;
- } else {
- /* old machines: blink loadavg. LEDs twice per second */
- if (count_HZ <= (HZ/2))
- currentleds &= ~(LED4|LED5|LED6|LED7);
- else
- currentleds |= (LED4|LED5|LED6|LED7);
+ for (i = 0; i < NUM_LEDS_PER_BOARD; i++) {
+ struct led_classdev *lp = &p->leds[i].led_cdev;
+
+ p->leds[i].led_bit = BIT(i);
+ lp->name = types[i].name;
+ lp->brightness = LED_FULL;
+ lp->brightness_set = types[i].handler;
+ lp->default_trigger = types[i].default_trigger;
+ err = led_classdev_register(&pdev->dev, lp);
+ if (err) {
+ dev_err(&pdev->dev, "Could not register %s LED\n",
+ lp->name);
+ for (i--; i >= 0; i--)
+ led_classdev_unregister(&p->leds[i].led_cdev);
+ return err;
}
}
- if (currentleds != lastleds)
- {
- led_func_ptr(currentleds); /* Update the LCD/LEDs */
- lastleds = currentleds;
- }
+ platform_set_drvdata(pdev, p);
- queue_delayed_work(led_wq, &led_task, LED_UPDATE_INTERVAL);
+ return 0;
}
-/*
- ** led_halt()
- **
- ** called by the reboot notifier chain at shutdown and stops all
- ** LED/LCD activities.
- **
- */
+static int platform_led_remove(struct platform_device *pdev)
+{
+ struct hppa_drvdata *p = platform_get_drvdata(pdev);
+ int i;
-static int led_halt(struct notifier_block *, unsigned long, void *);
+ for (i = 0; i < NUM_LEDS_PER_BOARD; i++)
+ led_classdev_unregister(&p->leds[i].led_cdev);
-static struct notifier_block led_notifier = {
- .notifier_call = led_halt,
+ return 0;
+}
+
+static struct led_type mainboard_led_types[NUM_LEDS_PER_BOARD] = {
+ {
+ .name = "platform-lan-tx",
+ .handler = set_led,
+ .default_trigger = "tx",
+ },
+ {
+ .name = "platform-lan-rx",
+ .handler = set_led,
+ .default_trigger = "rx",
+ },
+ {
+ .name = "platform-disk",
+ .handler = set_led,
+ .default_trigger = "disk-activity",
+ },
+ {
+ .name = "platform-heartbeat",
+ .handler = set_led,
+ .default_trigger = "heartbeat",
+ },
+ {
+ .name = "platform-LED4",
+ .handler = set_led,
+ .default_trigger = "panic",
+ },
+ {
+ .name = "platform-LED5",
+ .handler = set_led,
+ .default_trigger = "panic",
+ },
+ {
+ .name = "platform-LED6",
+ .handler = set_led,
+ .default_trigger = "panic",
+ },
+ {
+ .name = "platform-LED7",
+ .handler = set_led,
+ .default_trigger = "panic",
+ },
};
-static int notifier_disabled = 0;
-static int led_halt(struct notifier_block *nb, unsigned long event, void *buf)
+static int platform_led_probe(struct platform_device *pdev)
{
- char *txt;
+ return hppa_led_generic_probe(pdev, mainboard_led_types);
+}
- if (notifier_disabled)
- return NOTIFY_OK;
+MODULE_ALIAS("platform:platform-leds");
- notifier_disabled = 1;
- switch (event) {
- case SYS_RESTART: txt = "SYSTEM RESTART";
- break;
- case SYS_HALT: txt = "SYSTEM HALT";
- break;
- case SYS_POWER_OFF: txt = "SYSTEM POWER OFF";
- break;
- default: return NOTIFY_DONE;
- }
-
- /* Cancel the work item and delete the queue */
- if (led_wq) {
- cancel_delayed_work_sync(&led_task);
- destroy_workqueue(led_wq);
- led_wq = NULL;
- }
-
- if (lcd_info.model == DISPLAY_MODEL_LCD)
- lcd_print(txt);
- else
- if (led_func_ptr)
- led_func_ptr(0xff); /* turn all LEDs ON */
-
- return NOTIFY_OK;
-}
+static struct platform_driver hppa_mainboard_led_driver = {
+ .probe = platform_led_probe,
+ .remove = platform_led_remove,
+ .driver = {
+ .name = "platform-leds",
+ },
+};
-/*
- ** register_led_driver()
- **
- ** registers an external LED or LCD for usage by this driver.
- ** currently only LCD-, LASI- and ASP-style LCD/LED's are supported.
- **
- */
+static struct platform_driver * const drivers[] = {
+ &hppa_mainboard_led_driver,
+};
+
+static struct platform_device platform_leds = {
+ .name = "platform-leds",
+};
+/**
+ * register_led_driver()
+ *
+ * @model: model type, one of the DISPLAY_MODEL_XXXX values
+ * @cmd_reg: physical address of cmd register for the LED/LCD
+ * @data_reg: physical address of data register for the LED/LCD
+ *
+ * Registers a chassis LED or LCD which should be driven by this driver.
+ * Only PDC-based, LASI- or ASP-style LEDs and LCDs are supported.
+ */
int __init register_led_driver(int model, unsigned long cmd_reg, unsigned long data_reg)
{
- static int initialized;
-
- if (initialized || !data_reg)
+ if (led_func_ptr || !data_reg)
return 1;
-
+
+ /* No LEDs when running in QEMU */
+ if (running_on_qemu)
+ return 1;
+
lcd_info.model = model; /* store the values */
LCD_CMD_REG = (cmd_reg == LED_CMD_REG_NONE) ? 0 : cmd_reg;
switch (lcd_info.model) {
case DISPLAY_MODEL_LCD:
LCD_DATA_REG = data_reg;
- printk(KERN_INFO "LCD display at %lx,%lx registered\n",
+ pr_info("led: LCD display at %#lx and %#lx\n",
LCD_CMD_REG , LCD_DATA_REG);
led_func_ptr = led_LCD_driver;
- led_type = LED_HASLCD;
+ if (lcd_no_led_support)
+ led_type = LED_HAS_LCD;
+ else
+ led_type = LED_HAS_LCD | LED_HAS_LED;
break;
case DISPLAY_MODEL_LASI:
- /* Skip to register LED in QEMU */
- if (running_on_qemu)
- return 1;
LED_DATA_REG = data_reg;
led_func_ptr = led_LASI_driver;
- printk(KERN_INFO "LED display at %lx registered\n", LED_DATA_REG);
- led_type = LED_NOLCD;
+ pr_info("led: LED display at %#lx\n", LED_DATA_REG);
+ led_type = LED_HAS_LED;
break;
case DISPLAY_MODEL_OLD_ASP:
LED_DATA_REG = data_reg;
led_func_ptr = led_ASP_driver;
- printk(KERN_INFO "LED (ASP-style) display at %lx registered\n",
+ pr_info("led: LED (ASP-style) display at %#lx\n",
LED_DATA_REG);
- led_type = LED_NOLCD;
+ led_type = LED_HAS_LED;
break;
default:
- printk(KERN_ERR "%s: Wrong LCD/LED model %d !\n",
- __func__, lcd_info.model);
+ pr_err("led: Unknown LCD/LED model type %d\n", lcd_info.model);
return 1;
}
-
- /* mark the LCD/LED driver now as initialized and
- * register to the reboot notifier chain */
- initialized++;
- register_reboot_notifier(&led_notifier);
-
- /* Ensure the work is queued */
- if (led_wq) {
- queue_delayed_work(led_wq, &led_task, 0);
- }
- return 0;
-}
+ platform_register_drivers(drivers, ARRAY_SIZE(drivers));
-/*
- ** register_led_regions()
- **
- ** register_led_regions() registers the LCD/LED regions for /procfs.
- ** At bootup - where the initialisation of the LCD/LED normally happens -
- ** not all internal structures of request_region() are properly set up,
- ** so that we delay the led-registration until after busdevices_init()
- ** has been executed.
- **
- */
-
-static int __init register_led_regions(void)
-{
- switch (lcd_info.model) {
- case DISPLAY_MODEL_LCD:
- request_mem_region((unsigned long)LCD_CMD_REG, 1, "lcd_cmd");
- request_mem_region((unsigned long)LCD_DATA_REG, 1, "lcd_data");
- break;
- case DISPLAY_MODEL_LASI:
- case DISPLAY_MODEL_OLD_ASP:
- request_mem_region((unsigned long)LED_DATA_REG, 1, "led_data");
- break;
- }
- return 0;
-}
-late_initcall(register_led_regions);
-
-
-/*
- **
- ** lcd_print()
- **
- ** Displays the given string on the LCD-Display of newer machines.
- ** lcd_print() disables/enables the timer-based led work queue to
- ** avoid a race condition while writing the CMD/DATA register pair.
- **
- */
-int lcd_print( const char *str )
-{
- int i;
-
- if (!led_func_ptr || lcd_info.model != DISPLAY_MODEL_LCD)
- return 0;
-
- /* temporarily disable the led work task */
- if (led_wq)
- cancel_delayed_work_sync(&led_task);
-
- /* copy display string to buffer for procfs */
- strscpy(lcd_text, str, sizeof(lcd_text));
-
- /* Set LCD Cursor to 1st character */
- gsc_writeb(lcd_info.reset_cmd1, LCD_CMD_REG);
- udelay(lcd_info.min_cmd_delay);
-
- /* Print the string */
- for (i=0; i < lcd_info.lcd_width; i++) {
- if (str && *str)
- gsc_writeb(*str++, LCD_DATA_REG);
- else
- gsc_writeb(' ', LCD_DATA_REG);
- udelay(lcd_info.min_cmd_delay);
- }
-
- /* re-queue the work */
- if (led_wq) {
- queue_delayed_work(led_wq, &led_task, 0);
- }
-
- return lcd_info.lcd_width;
+ return register_reboot_notifier(&lcd_system_halt_notifier);
}
-/*
- ** led_init()
- **
- ** led_init() is called very early in the bootup-process from setup.c
- ** and asks the PDC for an usable chassis LCD or LED.
- ** If the PDC doesn't return any info, then the LED
- ** is detected by lasi.c or asp.c and registered with the
- ** above functions lasi_led_init() or asp_led_init().
- ** KittyHawk machines have often a buggy PDC, so that
- ** we explicitly check for those machines here.
+/**
+ * early_led_init()
+ *
+ * early_led_init() is called early in the bootup-process and asks the
+ * PDC for an usable chassis LCD or LED. If the PDC doesn't return any
+ * info, then a LED might be detected by the LASI or ASP drivers later.
+ * KittyHawk machines have often a buggy PDC, so that we explicitly check
+ * for those machines here.
*/
-
-int __init led_init(void)
+static int __init early_led_init(void)
{
struct pdc_chassis_info chassis_info;
int ret;
snprintf(lcd_text_default, sizeof(lcd_text_default),
"Linux %s", init_utsname()->release);
+ strcpy(lcd_text, lcd_text_default);
+ lcd_new_text = 1;
/* Work around the buggy PDC of KittyHawk-machines */
switch (CPU_HVERSION) {
case 0x582: /* KittyHawk DC3 100 (K400) */
case 0x583: /* KittyHawk DC3 120 (K410) */
case 0x58B: /* KittyHawk DC2 100 (K200) */
- printk(KERN_INFO "%s: KittyHawk-Machine (hversion 0x%x) found, "
- "LED detection skipped.\n", __FILE__, CPU_HVERSION);
+ pr_info("LCD on KittyHawk-Machine found.\n");
+ lcd_info.model = DISPLAY_MODEL_LCD;
+ /* KittyHawk has no LED support on its LCD, so skip LED detection */
lcd_no_led_support = 1;
goto found; /* use the preinitialized values of lcd_info */
}
/* initialize the struct, so that we can check for valid return values */
- lcd_info.model = DISPLAY_MODEL_NONE;
chassis_info.actcnt = chassis_info.maxcnt = 0;
ret = pdc_chassis_info(&chassis_info, &lcd_info, sizeof(lcd_info));
- if (ret == PDC_OK) {
- DPRINTK((KERN_INFO "%s: chassis info: model=%d (%s), "
- "lcd_width=%d, cmd_delay=%u,\n"
- "%s: sizecnt=%d, actcnt=%ld, maxcnt=%ld\n",
- __FILE__, lcd_info.model,
- (lcd_info.model==DISPLAY_MODEL_LCD) ? "LCD" :
- (lcd_info.model==DISPLAY_MODEL_LASI) ? "LED" : "unknown",
- lcd_info.lcd_width, lcd_info.min_cmd_delay,
- __FILE__, sizeof(lcd_info),
- chassis_info.actcnt, chassis_info.maxcnt));
- DPRINTK((KERN_INFO "%s: cmd=%p, data=%p, reset1=%x, reset2=%x, act_enable=%d\n",
- __FILE__, lcd_info.lcd_cmd_reg_addr,
- lcd_info.lcd_data_reg_addr, lcd_info.reset_cmd1,
- lcd_info.reset_cmd2, lcd_info.act_enable ));
-
- /* check the results. Some machines have a buggy PDC */
- if (chassis_info.actcnt <= 0 || chassis_info.actcnt != chassis_info.maxcnt)
- goto not_found;
+ if (ret != PDC_OK) {
+not_found:
+ lcd_info.model = DISPLAY_MODEL_NONE;
+ return 1;
+ }
- switch (lcd_info.model) {
- case DISPLAY_MODEL_LCD: /* LCD display */
- if (chassis_info.actcnt <
- offsetof(struct pdc_chassis_lcd_info_ret_block, _pad)-1)
- goto not_found;
- if (!lcd_info.act_enable) {
- DPRINTK((KERN_INFO "PDC prohibited usage of the LCD.\n"));
- goto not_found;
- }
- break;
-
- case DISPLAY_MODEL_NONE: /* no LED or LCD available */
- printk(KERN_INFO "PDC reported no LCD or LED.\n");
+ /* check the results. Some machines have a buggy PDC */
+ if (chassis_info.actcnt <= 0 || chassis_info.actcnt != chassis_info.maxcnt)
+ goto not_found;
+
+ switch (lcd_info.model) {
+ case DISPLAY_MODEL_LCD: /* LCD display */
+ if (chassis_info.actcnt <
+ offsetof(struct pdc_chassis_lcd_info_ret_block, _pad)-1)
goto not_found;
+ if (!lcd_info.act_enable) {
+ /* PDC tells LCD should not be used. */
+ goto not_found;
+ }
+ break;
- case DISPLAY_MODEL_LASI: /* Lasi style 8 bit LED display */
- if (chassis_info.actcnt != 8 && chassis_info.actcnt != 32)
- goto not_found;
- break;
+ case DISPLAY_MODEL_NONE: /* no LED or LCD available */
+ goto not_found;
- default:
- printk(KERN_WARNING "PDC reported unknown LCD/LED model %d\n",
- lcd_info.model);
+ case DISPLAY_MODEL_LASI: /* Lasi style 8 bit LED display */
+ if (chassis_info.actcnt != 8 && chassis_info.actcnt != 32)
goto not_found;
- } /* switch() */
-
-found:
- /* register the LCD/LED driver */
- register_led_driver(lcd_info.model, LCD_CMD_REG, LCD_DATA_REG);
- return 0;
+ break;
- } else { /* if() */
- DPRINTK((KERN_INFO "pdc_chassis_info call failed with retval = %d\n", ret));
+ default:
+ pr_warn("PDC reported unknown LCD/LED model %d\n",
+ lcd_info.model);
+ goto not_found;
}
-not_found:
- lcd_info.model = DISPLAY_MODEL_NONE;
- return 1;
+found:
+ /* register the LCD/LED driver */
+ return register_led_driver(lcd_info.model, LCD_CMD_REG, LCD_DATA_REG);
}
+arch_initcall(early_led_init);
-static void __exit led_exit(void)
+/**
+ * register_led_regions()
+ *
+ * Register_led_regions() registers the LCD/LED regions for /procfs.
+ * At bootup - where the initialisation of the LCD/LED often happens
+ * not all internal structures of request_region() are properly set up,
+ * so that we delay the led-registration until after busdevices_init()
+ * has been executed.
+ */
+static void __init register_led_regions(void)
{
- unregister_reboot_notifier(&led_notifier);
- return;
+ switch (lcd_info.model) {
+ case DISPLAY_MODEL_LCD:
+ request_mem_region((unsigned long)LCD_CMD_REG, 1, "lcd_cmd");
+ request_mem_region((unsigned long)LCD_DATA_REG, 1, "lcd_data");
+ break;
+ case DISPLAY_MODEL_LASI:
+ case DISPLAY_MODEL_OLD_ASP:
+ request_mem_region((unsigned long)LED_DATA_REG, 1, "led_data");
+ break;
+ }
}
-#ifdef CONFIG_PROC_FS
-module_init(led_create_procfs)
-#endif
+static int __init startup_leds(void)
+{
+ if (platform_device_register(&platform_leds))
+ printk(KERN_INFO "LED: failed to register LEDs\n");
+ register_led_regions();
+ return 0;
+}
+device_initcall(startup_leds);
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