Platform: OLPC: move debugfs support from x86 EC driver
There's nothing about the debugfs interface for the EC driver that is architecture-specific, so move it into the arch-independent driver. The code is mostly unchanged with the exception of renamed variables, coding style changes, and API updates. Signed-off-by: Andres Salomon <dilinger@queued.net> Acked-by: Paul Fox <pgf@laptop.org> Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Andres Salomon
parent
85f90cf6ca
commit
6cca83d498
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@ -19,7 +19,6 @@
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#include <linux/platform_device.h>
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#include <linux/of.h>
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#include <linux/syscore_ops.h>
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#include <linux/debugfs.h>
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#include <linux/mutex.h>
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#include <linux/olpc-ec.h>
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@ -31,15 +30,6 @@
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struct olpc_platform_t olpc_platform_info;
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EXPORT_SYMBOL_GPL(olpc_platform_info);
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/* debugfs interface to EC commands */
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#define EC_MAX_CMD_ARGS (5 + 1) /* cmd byte + 5 args */
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#define EC_MAX_CMD_REPLY (8)
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static struct dentry *ec_debugfs_dir;
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static DEFINE_MUTEX(ec_debugfs_cmd_lock);
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static unsigned char ec_debugfs_resp[EC_MAX_CMD_REPLY];
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static unsigned int ec_debugfs_resp_bytes;
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/* EC event mask to be applied during suspend (defining wakeup sources). */
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static u16 ec_wakeup_mask;
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@ -273,91 +263,6 @@ int olpc_ec_sci_query(u16 *sci_value)
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}
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EXPORT_SYMBOL_GPL(olpc_ec_sci_query);
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static ssize_t ec_debugfs_cmd_write(struct file *file, const char __user *buf,
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size_t size, loff_t *ppos)
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{
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int i, m;
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unsigned char ec_cmd[EC_MAX_CMD_ARGS];
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unsigned int ec_cmd_int[EC_MAX_CMD_ARGS];
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char cmdbuf[64];
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int ec_cmd_bytes;
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mutex_lock(&ec_debugfs_cmd_lock);
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size = simple_write_to_buffer(cmdbuf, sizeof(cmdbuf), ppos, buf, size);
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m = sscanf(cmdbuf, "%x:%u %x %x %x %x %x", &ec_cmd_int[0],
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&ec_debugfs_resp_bytes,
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&ec_cmd_int[1], &ec_cmd_int[2], &ec_cmd_int[3],
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&ec_cmd_int[4], &ec_cmd_int[5]);
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if (m < 2 || ec_debugfs_resp_bytes > EC_MAX_CMD_REPLY) {
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/* reset to prevent overflow on read */
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ec_debugfs_resp_bytes = 0;
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printk(KERN_DEBUG "olpc-ec: bad ec cmd: "
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"cmd:response-count [arg1 [arg2 ...]]\n");
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size = -EINVAL;
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goto out;
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}
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/* convert scanf'd ints to char */
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ec_cmd_bytes = m - 2;
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for (i = 0; i <= ec_cmd_bytes; i++)
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ec_cmd[i] = ec_cmd_int[i];
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printk(KERN_DEBUG "olpc-ec: debugfs cmd 0x%02x with %d args "
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"%02x %02x %02x %02x %02x, want %d returns\n",
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ec_cmd[0], ec_cmd_bytes, ec_cmd[1], ec_cmd[2], ec_cmd[3],
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ec_cmd[4], ec_cmd[5], ec_debugfs_resp_bytes);
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olpc_ec_cmd(ec_cmd[0], (ec_cmd_bytes == 0) ? NULL : &ec_cmd[1],
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ec_cmd_bytes, ec_debugfs_resp, ec_debugfs_resp_bytes);
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printk(KERN_DEBUG "olpc-ec: response "
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"%02x %02x %02x %02x %02x %02x %02x %02x (%d bytes expected)\n",
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ec_debugfs_resp[0], ec_debugfs_resp[1], ec_debugfs_resp[2],
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ec_debugfs_resp[3], ec_debugfs_resp[4], ec_debugfs_resp[5],
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ec_debugfs_resp[6], ec_debugfs_resp[7], ec_debugfs_resp_bytes);
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out:
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mutex_unlock(&ec_debugfs_cmd_lock);
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return size;
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}
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static ssize_t ec_debugfs_cmd_read(struct file *file, char __user *buf,
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size_t size, loff_t *ppos)
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{
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unsigned int i, r;
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char *rp;
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char respbuf[64];
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mutex_lock(&ec_debugfs_cmd_lock);
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rp = respbuf;
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rp += sprintf(rp, "%02x", ec_debugfs_resp[0]);
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for (i = 1; i < ec_debugfs_resp_bytes; i++)
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rp += sprintf(rp, ", %02x", ec_debugfs_resp[i]);
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mutex_unlock(&ec_debugfs_cmd_lock);
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rp += sprintf(rp, "\n");
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r = rp - respbuf;
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return simple_read_from_buffer(buf, size, ppos, respbuf, r);
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}
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static const struct file_operations ec_debugfs_genops = {
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.write = ec_debugfs_cmd_write,
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.read = ec_debugfs_cmd_read,
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};
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static void setup_debugfs(void)
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{
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ec_debugfs_dir = debugfs_create_dir("olpc-ec", 0);
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if (ec_debugfs_dir == ERR_PTR(-ENODEV))
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return;
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debugfs_create_file("cmd", 0600, ec_debugfs_dir, NULL,
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&ec_debugfs_genops);
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}
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static int olpc_ec_suspend(struct platform_device *pdev)
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{
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return olpc_ec_mask_write(ec_wakeup_mask);
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@ -470,8 +375,6 @@ static int __init olpc_init(void)
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return r;
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}
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setup_debugfs();
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return 0;
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}
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@ -6,6 +6,7 @@
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* Licensed under the GPL v2 or later.
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*/
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#include <linux/completion.h>
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#include <linux/debugfs.h>
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#include <linux/spinlock.h>
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#include <linux/mutex.h>
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#include <linux/platform_device.h>
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@ -31,6 +32,8 @@ struct ec_cmd_desc {
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struct olpc_ec_priv {
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struct olpc_ec_driver *drv;
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struct dentry *dbgfs_dir;
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/*
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* Running an EC command while suspending means we don't always finish
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* the command before the machine suspends. This means that the EC
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@ -144,6 +147,114 @@ int olpc_ec_cmd(u8 cmd, u8 *inbuf, size_t inlen, u8 *outbuf, size_t outlen)
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}
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EXPORT_SYMBOL_GPL(olpc_ec_cmd);
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#ifdef CONFIG_DEBUG_FS
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/*
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* debugfs support for "generic commands", to allow sending
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* arbitrary EC commands from userspace.
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*/
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#define EC_MAX_CMD_ARGS (5 + 1) /* cmd byte + 5 args */
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#define EC_MAX_CMD_REPLY (8)
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static DEFINE_MUTEX(ec_dbgfs_lock);
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static unsigned char ec_dbgfs_resp[EC_MAX_CMD_REPLY];
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static unsigned int ec_dbgfs_resp_bytes;
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static ssize_t ec_dbgfs_cmd_write(struct file *file, const char __user *buf,
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size_t size, loff_t *ppos)
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{
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int i, m;
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unsigned char ec_cmd[EC_MAX_CMD_ARGS];
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unsigned int ec_cmd_int[EC_MAX_CMD_ARGS];
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char cmdbuf[64];
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int ec_cmd_bytes;
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mutex_lock(&ec_dbgfs_lock);
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size = simple_write_to_buffer(cmdbuf, sizeof(cmdbuf), ppos, buf, size);
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m = sscanf(cmdbuf, "%x:%u %x %x %x %x %x", &ec_cmd_int[0],
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&ec_dbgfs_resp_bytes, &ec_cmd_int[1], &ec_cmd_int[2],
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&ec_cmd_int[3], &ec_cmd_int[4], &ec_cmd_int[5]);
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if (m < 2 || ec_dbgfs_resp_bytes > EC_MAX_CMD_REPLY) {
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/* reset to prevent overflow on read */
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ec_dbgfs_resp_bytes = 0;
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pr_debug("olpc-ec: bad ec cmd: cmd:response-count [arg1 [arg2 ...]]\n");
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size = -EINVAL;
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goto out;
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}
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/* convert scanf'd ints to char */
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ec_cmd_bytes = m - 2;
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for (i = 0; i <= ec_cmd_bytes; i++)
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ec_cmd[i] = ec_cmd_int[i];
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pr_debug("olpc-ec: debugfs cmd 0x%02x with %d args %02x %02x %02x %02x %02x, want %d returns\n",
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ec_cmd[0], ec_cmd_bytes, ec_cmd[1], ec_cmd[2],
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ec_cmd[3], ec_cmd[4], ec_cmd[5], ec_dbgfs_resp_bytes);
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olpc_ec_cmd(ec_cmd[0], (ec_cmd_bytes == 0) ? NULL : &ec_cmd[1],
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ec_cmd_bytes, ec_dbgfs_resp, ec_dbgfs_resp_bytes);
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pr_debug("olpc-ec: response %02x %02x %02x %02x %02x %02x %02x %02x (%d bytes expected)\n",
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ec_dbgfs_resp[0], ec_dbgfs_resp[1], ec_dbgfs_resp[2],
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ec_dbgfs_resp[3], ec_dbgfs_resp[4], ec_dbgfs_resp[5],
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ec_dbgfs_resp[6], ec_dbgfs_resp[7],
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ec_dbgfs_resp_bytes);
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out:
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mutex_unlock(&ec_dbgfs_lock);
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return size;
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}
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static ssize_t ec_dbgfs_cmd_read(struct file *file, char __user *buf,
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size_t size, loff_t *ppos)
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{
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unsigned int i, r;
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char *rp;
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char respbuf[64];
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mutex_lock(&ec_dbgfs_lock);
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rp = respbuf;
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rp += sprintf(rp, "%02x", ec_dbgfs_resp[0]);
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for (i = 1; i < ec_dbgfs_resp_bytes; i++)
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rp += sprintf(rp, ", %02x", ec_dbgfs_resp[i]);
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mutex_unlock(&ec_dbgfs_lock);
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rp += sprintf(rp, "\n");
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r = rp - respbuf;
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return simple_read_from_buffer(buf, size, ppos, respbuf, r);
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}
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static const struct file_operations ec_dbgfs_ops = {
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.write = ec_dbgfs_cmd_write,
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.read = ec_dbgfs_cmd_read,
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};
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static struct dentry *olpc_ec_setup_debugfs(void)
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{
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struct dentry *dbgfs_dir;
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dbgfs_dir = debugfs_create_dir("olpc-ec", NULL);
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if (IS_ERR_OR_NULL(dbgfs_dir))
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return NULL;
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debugfs_create_file("cmd", 0600, dbgfs_dir, NULL, &ec_dbgfs_ops);
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return dbgfs_dir;
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}
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#else
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static struct dentry *olpc_ec_setup_debugfs(void)
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{
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return NULL;
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}
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#endif /* CONFIG_DEBUG_FS */
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static int olpc_ec_probe(struct platform_device *pdev)
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{
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struct olpc_ec_priv *ec;
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@ -160,6 +271,12 @@ static int olpc_ec_probe(struct platform_device *pdev)
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platform_set_drvdata(pdev, ec);
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err = ec_driver->probe ? ec_driver->probe(pdev) : 0;
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if (err) {
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ec_priv = NULL;
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kfree(ec);
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} else {
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ec->dbgfs_dir = olpc_ec_setup_debugfs();
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}
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return err;
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}
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