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Commit cdef0aa6 authored by Patrick Lai's avatar Patrick Lai Committed by Phani Kumar Uppalapati
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mfd: wcd9xxx-core: add debugfs entry to dump slimslave registers 



Currently, there is a debugfs entry defined for peeking one register
at a time. Add another debugfs entry to dump all SLIMBUS slave
register.

Change-Id: Iddf056d68afd3699d9d8d8eef83bd98d03e61fac
Signed-off-by: default avatarPatrick Lai <plai@codeaurora.org>
Signed-off-by: default avatarPhani Kumar Uppalapati <phaniu@codeaurora.org>
parent 0580b551

drivers/mfd/wcd9xxx-core.c

+49 −4
Original line number Diff line number Diff line 
/* Copyright (c) 2011-2014, The Linux Foundation. All rights reserved.

/* Copyright (c) 2011-2015, The Linux Foundation. All rights reserved.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 and
@@ -903,6 +903,7 @@ static struct dentry *debugfs_wcd9xxx_dent; 
static struct dentry *debugfs_peek;

static struct dentry *debugfs_poke;

static struct dentry *debugfs_power_state;

static struct dentry *debugfs_reg_dump;



static unsigned char read_data;
@@ -936,14 +937,54 @@ static int get_parameters(char *buf, long int *param1, int num_of_par) 
	return 0;

}



static ssize_t wcd9xxx_slimslave_reg_show(char __user *ubuf, size_t count,

					  loff_t *ppos)

{

	int i, reg_val, len;

	ssize_t total = 0;

	char tmp_buf[20]; /* each line is 12 bytes but 20 for margin of error */



	for (i = (int) *ppos / 12; i <= SLIM_MAX_REG_ADDR; i++) {

		reg_val = wcd9xxx_interface_reg_read(debugCodec, i);

		len = snprintf(tmp_buf, 25, "0x%.3x: 0x%.2x\n", i, reg_val);



		if ((total + len) >= count - 1)

			break;

		if (copy_to_user((ubuf + total), tmp_buf, len)) {

			pr_err("%s: fail to copy reg dump\n", __func__);

			total = -EFAULT;

			goto copy_err;

		}

		*ppos += len;

		total += len;

	}



copy_err:

	return total;

}



static ssize_t codec_debug_read(struct file *file, char __user *ubuf,

				size_t count, loff_t *ppos)

{

	char lbuf[8];

	char *access_str = file->private_data;

	ssize_t ret_cnt;



	if (*ppos < 0 || !count)

		return -EINVAL;



	if (!strcmp(access_str, "slimslave_peek")) {

		snprintf(lbuf, sizeof(lbuf), "0x%x\n", read_data);

	return simple_read_from_buffer(ubuf, count, ppos, lbuf,

		ret_cnt = simple_read_from_buffer(ubuf, count, ppos, lbuf,

					       strnlen(lbuf, 7));

	} else if (!strcmp(access_str, "slimslave_reg_dump")) {

		ret_cnt = wcd9xxx_slimslave_reg_show(ubuf, count, ppos);

	} else {

		pr_err("%s: %s not permitted to read\n", __func__, access_str);

		ret_cnt = -EPERM;

	}



	return ret_cnt;

}



/*
@@ -2070,6 +2111,10 @@ static int wcd9xxx_slim_probe(struct slim_device *slim) 
		debugfs_power_state = debugfs_create_file("power_state",

		S_IFREG | S_IRUGO, debugfs_wcd9xxx_dent,

		(void *) "power_state", &codec_debug_ops);



		debugfs_reg_dump = debugfs_create_file("slimslave_reg_dump",

		S_IFREG | S_IRUGO, debugfs_wcd9xxx_dent,

		(void *) "slimslave_reg_dump", &codec_debug_ops);

	}

#endif

include/linux/mfd/wcd9xxx/wcd9xxx-slimslave.h

+3 −1
Original line number Diff line number Diff line 
/* Copyright (c) 2012-2014, The Linux Foundation. All rights reserved.

/* Copyright (c) 2012-2015, The Linux Foundation. All rights reserved.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 and
@@ -39,6 +39,8 @@ 


#define SLIM_MAX_RX_PORTS TAIKO_SB_PGD_MAX_NUMBER_OF_RX_SLAVE_DEV_PORTS



#define SLIM_MAX_REG_ADDR (0x180 + 4 * (SLIM_MAX_RX_PORTS))



#define TABLA_SB_PGD_RX_PORT_MULTI_CHANNEL_0_START_PORT_ID \

	TABLA_SB_PGD_OFFSET_OF_RX_SLAVE_DEV_PORTS

#define TAIKO_SB_PGD_RX_PORT_MULTI_CHANNEL_0_START_PORT_ID \