diff options
Diffstat (limited to 'drivers/regulator/dbx500-prcmu.c')
| -rw-r--r-- | drivers/regulator/dbx500-prcmu.c | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/drivers/regulator/dbx500-prcmu.c b/drivers/regulator/dbx500-prcmu.c new file mode 100644 index 000000000..a45c1e1ac --- /dev/null +++ b/drivers/regulator/dbx500-prcmu.c @@ -0,0 +1,155 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) ST-Ericsson SA 2010 + * + * Authors: Sundar Iyer <sundar.iyer@stericsson.com> for ST-Ericsson + * Bengt Jonsson <bengt.g.jonsson@stericsson.com> for ST-Ericsson + * + * UX500 common part of Power domain regulators + */ + +#include <linux/kernel.h> +#include <linux/err.h> +#include <linux/regulator/driver.h> +#include <linux/debugfs.h> +#include <linux/seq_file.h> +#include <linux/slab.h> +#include <linux/module.h> + +#include "dbx500-prcmu.h" + +/* + * power state reference count + */ +static int power_state_active_cnt; /* will initialize to zero */ +static DEFINE_SPINLOCK(power_state_active_lock); + +void power_state_active_enable(void) +{ + unsigned long flags; + + spin_lock_irqsave(&power_state_active_lock, flags); + power_state_active_cnt++; + spin_unlock_irqrestore(&power_state_active_lock, flags); +} + +int power_state_active_disable(void) +{ + int ret = 0; + unsigned long flags; + + spin_lock_irqsave(&power_state_active_lock, flags); + if (power_state_active_cnt <= 0) { + pr_err("power state: unbalanced enable/disable calls\n"); + ret = -EINVAL; + goto out; + } + + power_state_active_cnt--; +out: + spin_unlock_irqrestore(&power_state_active_lock, flags); + return ret; +} + +#ifdef CONFIG_REGULATOR_DEBUG + +static int power_state_active_get(void) +{ + unsigned long flags; + int cnt; + + spin_lock_irqsave(&power_state_active_lock, flags); + cnt = power_state_active_cnt; + spin_unlock_irqrestore(&power_state_active_lock, flags); + + return cnt; +} + +static struct ux500_regulator_debug { + struct dentry *dir; + struct dbx500_regulator_info *regulator_array; + int num_regulators; + u8 *state_before_suspend; + u8 *state_after_suspend; +} rdebug; + +static int ux500_regulator_power_state_cnt_show(struct seq_file *s, void *p) +{ + /* print power state count */ + seq_printf(s, "ux500-regulator power state count: %i\n", + power_state_active_get()); + + return 0; +} +DEFINE_SHOW_ATTRIBUTE(ux500_regulator_power_state_cnt); + +static int ux500_regulator_status_show(struct seq_file *s, void *p) +{ + int i; + + /* print dump header */ + seq_puts(s, "ux500-regulator status:\n"); + seq_printf(s, "%31s : %8s : %8s\n", "current", "before", "after"); + + for (i = 0; i < rdebug.num_regulators; i++) { + struct dbx500_regulator_info *info; + /* Access per-regulator data */ + info = &rdebug.regulator_array[i]; + + /* print status */ + seq_printf(s, "%20s : %8s : %8s : %8s\n", + info->desc.name, + info->is_enabled ? "enabled" : "disabled", + rdebug.state_before_suspend[i] ? "enabled" : "disabled", + rdebug.state_after_suspend[i] ? "enabled" : "disabled"); + } + + return 0; +} +DEFINE_SHOW_ATTRIBUTE(ux500_regulator_status); + +int +ux500_regulator_debug_init(struct platform_device *pdev, + struct dbx500_regulator_info *regulator_info, + int num_regulators) +{ + /* create directory */ + rdebug.dir = debugfs_create_dir("ux500-regulator", NULL); + + /* create "status" file */ + debugfs_create_file("status", 0444, rdebug.dir, &pdev->dev, + &ux500_regulator_status_fops); + + /* create "power-state-count" file */ + debugfs_create_file("power-state-count", 0444, rdebug.dir, + &pdev->dev, &ux500_regulator_power_state_cnt_fops); + + rdebug.regulator_array = regulator_info; + rdebug.num_regulators = num_regulators; + + rdebug.state_before_suspend = kzalloc(num_regulators, GFP_KERNEL); + if (!rdebug.state_before_suspend) + goto exit_destroy_power_state; + + rdebug.state_after_suspend = kzalloc(num_regulators, GFP_KERNEL); + if (!rdebug.state_after_suspend) + goto exit_free; + + return 0; + +exit_free: + kfree(rdebug.state_before_suspend); +exit_destroy_power_state: + debugfs_remove_recursive(rdebug.dir); + return -ENOMEM; +} + +int ux500_regulator_debug_exit(void) +{ + debugfs_remove_recursive(rdebug.dir); + kfree(rdebug.state_after_suspend); + kfree(rdebug.state_before_suspend); + + return 0; +} +#endif |