[PATCH 2/2] rtc: ds1685: remove sysfs access to control registers
From: Alexandre Belloni
Date: Mon Jun 18 2018 - 04:52:24 EST
Access to the control registers is mostly not needed and can cause runtime
issues (like missed interrupts). Remove this debugging interface.
Signed-off-by: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxx>
---
drivers/rtc/Kconfig | 12 --
drivers/rtc/rtc-ds1685.c | 369 ---------------------------------------
2 files changed, 381 deletions(-)
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 7e647e8d0ef3..9320f56986f4 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -1016,18 +1016,6 @@ config RTC_DRV_DS17885
endchoice
-config RTC_DS1685_SYSFS_REGS
- bool "SysFS access to RTC register bits"
- depends on RTC_DRV_DS1685_FAMILY && SYSFS
- help
- Enable this to provide access to the RTC control register bits
- in /sys. Some of the bits are read-write, others are read-only.
-
- Keep in mind that reading Control C's bits automatically clears
- all pending IRQ flags - this can cause lost interrupts.
-
- If you know that you need access to these bits, choose Y, Else N.
-
config RTC_DRV_DS1742
tristate "Maxim/Dallas DS1742/1743"
depends on HAS_IOMEM
diff --git a/drivers/rtc/rtc-ds1685.c b/drivers/rtc/rtc-ds1685.c
index 28dbe2ba52c8..2bad1f50414f 100644
--- a/drivers/rtc/rtc-ds1685.c
+++ b/drivers/rtc/rtc-ds1685.c
@@ -1127,341 +1127,6 @@ ds1685_rtc_sysfs_misc_grp = {
.attrs = ds1685_rtc_sysfs_misc_attrs,
};
-#ifdef CONFIG_RTC_DS1685_SYSFS_REGS
-/**
- * struct ds1685_rtc_ctrl_regs.
- * @name: char pointer for the bit name.
- * @reg: control register the bit is in.
- * @bit: the bit's offset in the register.
- */
-struct ds1685_rtc_ctrl_regs {
- const char *name;
- const u8 reg;
- const u8 bit;
-};
-
-/*
- * Ctrl register bit lookup table.
- */
-static const struct ds1685_rtc_ctrl_regs
-ds1685_ctrl_regs_table[] = {
- { "uip", RTC_CTRL_A, RTC_CTRL_A_UIP },
- { "dv2", RTC_CTRL_A, RTC_CTRL_A_DV2 },
- { "dv1", RTC_CTRL_A, RTC_CTRL_A_DV1 },
- { "dv0", RTC_CTRL_A, RTC_CTRL_A_DV0 },
- { "rs3", RTC_CTRL_A, RTC_CTRL_A_RS3 },
- { "rs2", RTC_CTRL_A, RTC_CTRL_A_RS2 },
- { "rs1", RTC_CTRL_A, RTC_CTRL_A_RS1 },
- { "rs0", RTC_CTRL_A, RTC_CTRL_A_RS0 },
- { "set", RTC_CTRL_B, RTC_CTRL_B_SET },
- { "pie", RTC_CTRL_B, RTC_CTRL_B_PIE },
- { "aie", RTC_CTRL_B, RTC_CTRL_B_AIE },
- { "uie", RTC_CTRL_B, RTC_CTRL_B_UIE },
- { "sqwe", RTC_CTRL_B, RTC_CTRL_B_SQWE },
- { "dm", RTC_CTRL_B, RTC_CTRL_B_DM },
- { "2412", RTC_CTRL_B, RTC_CTRL_B_2412 },
- { "dse", RTC_CTRL_B, RTC_CTRL_B_DSE },
- { "irqf", RTC_CTRL_C, RTC_CTRL_C_IRQF },
- { "pf", RTC_CTRL_C, RTC_CTRL_C_PF },
- { "af", RTC_CTRL_C, RTC_CTRL_C_AF },
- { "uf", RTC_CTRL_C, RTC_CTRL_C_UF },
- { "vrt", RTC_CTRL_D, RTC_CTRL_D_VRT },
- { "vrt2", RTC_EXT_CTRL_4A, RTC_CTRL_4A_VRT2 },
- { "incr", RTC_EXT_CTRL_4A, RTC_CTRL_4A_INCR },
- { "pab", RTC_EXT_CTRL_4A, RTC_CTRL_4A_PAB },
- { "rf", RTC_EXT_CTRL_4A, RTC_CTRL_4A_RF },
- { "wf", RTC_EXT_CTRL_4A, RTC_CTRL_4A_WF },
- { "kf", RTC_EXT_CTRL_4A, RTC_CTRL_4A_KF },
-#if !defined(CONFIG_RTC_DRV_DS1685) && !defined(CONFIG_RTC_DRV_DS1689)
- { "bme", RTC_EXT_CTRL_4A, RTC_CTRL_4A_BME },
-#endif
- { "abe", RTC_EXT_CTRL_4B, RTC_CTRL_4B_ABE },
- { "e32k", RTC_EXT_CTRL_4B, RTC_CTRL_4B_E32K },
- { "cs", RTC_EXT_CTRL_4B, RTC_CTRL_4B_CS },
- { "rce", RTC_EXT_CTRL_4B, RTC_CTRL_4B_RCE },
- { "prs", RTC_EXT_CTRL_4B, RTC_CTRL_4B_PRS },
- { "rie", RTC_EXT_CTRL_4B, RTC_CTRL_4B_RIE },
- { "wie", RTC_EXT_CTRL_4B, RTC_CTRL_4B_WIE },
- { "kse", RTC_EXT_CTRL_4B, RTC_CTRL_4B_KSE },
- { NULL, 0, 0 },
-};
-
-/**
- * ds1685_rtc_sysfs_ctrl_regs_lookup - ctrl register bit lookup function.
- * @name: ctrl register bit to look up in ds1685_ctrl_regs_table.
- */
-static const struct ds1685_rtc_ctrl_regs*
-ds1685_rtc_sysfs_ctrl_regs_lookup(const char *name)
-{
- const struct ds1685_rtc_ctrl_regs *p = ds1685_ctrl_regs_table;
-
- for (; p->name != NULL; ++p)
- if (strcmp(p->name, name) == 0)
- return p;
-
- return NULL;
-}
-
-/**
- * ds1685_rtc_sysfs_ctrl_regs_show - reads a ctrl register bit via sysfs.
- * @dev: pointer to device structure.
- * @attr: pointer to device_attribute structure.
- * @buf: pointer to char array to hold the output.
- */
-static ssize_t
-ds1685_rtc_sysfs_ctrl_regs_show(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- u8 tmp;
- struct ds1685_priv *rtc = dev_get_drvdata(dev);
- const struct ds1685_rtc_ctrl_regs *reg_info =
- ds1685_rtc_sysfs_ctrl_regs_lookup(attr->attr.name);
-
- /* Make sure we actually matched something. */
- if (!reg_info)
- return -EINVAL;
-
- /* No spinlock during a read -- mutex is already held. */
- ds1685_rtc_switch_to_bank1(rtc);
- tmp = rtc->read(rtc, reg_info->reg) & reg_info->bit;
- ds1685_rtc_switch_to_bank0(rtc);
-
- return sprintf(buf, "%d\n", (tmp ? 1 : 0));
-}
-
-/**
- * ds1685_rtc_sysfs_ctrl_regs_store - writes a ctrl register bit via sysfs.
- * @dev: pointer to device structure.
- * @attr: pointer to device_attribute structure.
- * @buf: pointer to char array to hold the output.
- * @count: number of bytes written.
- */
-static ssize_t
-ds1685_rtc_sysfs_ctrl_regs_store(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t count)
-{
- struct ds1685_priv *rtc = dev_get_drvdata(dev);
- u8 reg = 0, bit = 0, tmp;
- unsigned long flags;
- long int val = 0;
- const struct ds1685_rtc_ctrl_regs *reg_info =
- ds1685_rtc_sysfs_ctrl_regs_lookup(attr->attr.name);
-
- /* We only accept numbers. */
- if (kstrtol(buf, 10, &val) < 0)
- return -EINVAL;
-
- /* bits are binary, 0 or 1 only. */
- if ((val != 0) && (val != 1))
- return -ERANGE;
-
- /* Make sure we actually matched something. */
- if (!reg_info)
- return -EINVAL;
-
- reg = reg_info->reg;
- bit = reg_info->bit;
-
- /* Safe to spinlock during a write. */
- ds1685_rtc_begin_ctrl_access(rtc, &flags);
- tmp = rtc->read(rtc, reg);
- rtc->write(rtc, reg, (val ? (tmp | bit) : (tmp & ~(bit))));
- ds1685_rtc_end_ctrl_access(rtc, flags);
-
- return count;
-}
-
-/**
- * DS1685_RTC_SYSFS_CTRL_REG_RO - device_attribute for read-only register bit.
- * @bit: bit to read.
- */
-#define DS1685_RTC_SYSFS_CTRL_REG_RO(bit) \
- static DEVICE_ATTR(bit, S_IRUGO, \
- ds1685_rtc_sysfs_ctrl_regs_show, NULL)
-
-/**
- * DS1685_RTC_SYSFS_CTRL_REG_RW - device_attribute for read-write register bit.
- * @bit: bit to read or write.
- */
-#define DS1685_RTC_SYSFS_CTRL_REG_RW(bit) \
- static DEVICE_ATTR(bit, S_IRUGO | S_IWUSR, \
- ds1685_rtc_sysfs_ctrl_regs_show, \
- ds1685_rtc_sysfs_ctrl_regs_store)
-
-/*
- * Control Register A bits.
- */
-DS1685_RTC_SYSFS_CTRL_REG_RO(uip);
-DS1685_RTC_SYSFS_CTRL_REG_RW(dv2);
-DS1685_RTC_SYSFS_CTRL_REG_RW(dv1);
-DS1685_RTC_SYSFS_CTRL_REG_RO(dv0);
-DS1685_RTC_SYSFS_CTRL_REG_RW(rs3);
-DS1685_RTC_SYSFS_CTRL_REG_RW(rs2);
-DS1685_RTC_SYSFS_CTRL_REG_RW(rs1);
-DS1685_RTC_SYSFS_CTRL_REG_RW(rs0);
-
-static struct attribute*
-ds1685_rtc_sysfs_ctrla_attrs[] = {
- &dev_attr_uip.attr,
- &dev_attr_dv2.attr,
- &dev_attr_dv1.attr,
- &dev_attr_dv0.attr,
- &dev_attr_rs3.attr,
- &dev_attr_rs2.attr,
- &dev_attr_rs1.attr,
- &dev_attr_rs0.attr,
- NULL,
-};
-
-static const struct attribute_group
-ds1685_rtc_sysfs_ctrla_grp = {
- .name = "ctrla",
- .attrs = ds1685_rtc_sysfs_ctrla_attrs,
-};
-
-
-/*
- * Control Register B bits.
- */
-DS1685_RTC_SYSFS_CTRL_REG_RO(set);
-DS1685_RTC_SYSFS_CTRL_REG_RW(pie);
-DS1685_RTC_SYSFS_CTRL_REG_RW(aie);
-DS1685_RTC_SYSFS_CTRL_REG_RW(uie);
-DS1685_RTC_SYSFS_CTRL_REG_RW(sqwe);
-DS1685_RTC_SYSFS_CTRL_REG_RO(dm);
-DS1685_RTC_SYSFS_CTRL_REG_RO(2412);
-DS1685_RTC_SYSFS_CTRL_REG_RO(dse);
-
-static struct attribute*
-ds1685_rtc_sysfs_ctrlb_attrs[] = {
- &dev_attr_set.attr,
- &dev_attr_pie.attr,
- &dev_attr_aie.attr,
- &dev_attr_uie.attr,
- &dev_attr_sqwe.attr,
- &dev_attr_dm.attr,
- &dev_attr_2412.attr,
- &dev_attr_dse.attr,
- NULL,
-};
-
-static const struct attribute_group
-ds1685_rtc_sysfs_ctrlb_grp = {
- .name = "ctrlb",
- .attrs = ds1685_rtc_sysfs_ctrlb_attrs,
-};
-
-/*
- * Control Register C bits.
- *
- * Reading Control C clears these bits! Reading them individually can
- * possibly cause an interrupt to be missed. Use the /proc interface
- * to see all the bits in this register simultaneously.
- */
-DS1685_RTC_SYSFS_CTRL_REG_RO(irqf);
-DS1685_RTC_SYSFS_CTRL_REG_RO(pf);
-DS1685_RTC_SYSFS_CTRL_REG_RO(af);
-DS1685_RTC_SYSFS_CTRL_REG_RO(uf);
-
-static struct attribute*
-ds1685_rtc_sysfs_ctrlc_attrs[] = {
- &dev_attr_irqf.attr,
- &dev_attr_pf.attr,
- &dev_attr_af.attr,
- &dev_attr_uf.attr,
- NULL,
-};
-
-static const struct attribute_group
-ds1685_rtc_sysfs_ctrlc_grp = {
- .name = "ctrlc",
- .attrs = ds1685_rtc_sysfs_ctrlc_attrs,
-};
-
-/*
- * Control Register D bits.
- */
-DS1685_RTC_SYSFS_CTRL_REG_RO(vrt);
-
-static struct attribute*
-ds1685_rtc_sysfs_ctrld_attrs[] = {
- &dev_attr_vrt.attr,
- NULL,
-};
-
-static const struct attribute_group
-ds1685_rtc_sysfs_ctrld_grp = {
- .name = "ctrld",
- .attrs = ds1685_rtc_sysfs_ctrld_attrs,
-};
-
-/*
- * Control Register 4A bits.
- */
-DS1685_RTC_SYSFS_CTRL_REG_RO(vrt2);
-DS1685_RTC_SYSFS_CTRL_REG_RO(incr);
-DS1685_RTC_SYSFS_CTRL_REG_RW(pab);
-DS1685_RTC_SYSFS_CTRL_REG_RW(rf);
-DS1685_RTC_SYSFS_CTRL_REG_RW(wf);
-DS1685_RTC_SYSFS_CTRL_REG_RW(kf);
-#if !defined(CONFIG_RTC_DRV_DS1685) && !defined(CONFIG_RTC_DRV_DS1689)
-DS1685_RTC_SYSFS_CTRL_REG_RO(bme);
-#endif
-
-static struct attribute*
-ds1685_rtc_sysfs_ctrl4a_attrs[] = {
- &dev_attr_vrt2.attr,
- &dev_attr_incr.attr,
- &dev_attr_pab.attr,
- &dev_attr_rf.attr,
- &dev_attr_wf.attr,
- &dev_attr_kf.attr,
-#if !defined(CONFIG_RTC_DRV_DS1685) && !defined(CONFIG_RTC_DRV_DS1689)
- &dev_attr_bme.attr,
-#endif
- NULL,
-};
-
-static const struct attribute_group
-ds1685_rtc_sysfs_ctrl4a_grp = {
- .name = "ctrl4a",
- .attrs = ds1685_rtc_sysfs_ctrl4a_attrs,
-};
-
-/*
- * Control Register 4B bits.
- */
-DS1685_RTC_SYSFS_CTRL_REG_RW(abe);
-DS1685_RTC_SYSFS_CTRL_REG_RW(e32k);
-DS1685_RTC_SYSFS_CTRL_REG_RO(cs);
-DS1685_RTC_SYSFS_CTRL_REG_RW(rce);
-DS1685_RTC_SYSFS_CTRL_REG_RW(prs);
-DS1685_RTC_SYSFS_CTRL_REG_RW(rie);
-DS1685_RTC_SYSFS_CTRL_REG_RW(wie);
-DS1685_RTC_SYSFS_CTRL_REG_RW(kse);
-
-static struct attribute*
-ds1685_rtc_sysfs_ctrl4b_attrs[] = {
- &dev_attr_abe.attr,
- &dev_attr_e32k.attr,
- &dev_attr_cs.attr,
- &dev_attr_rce.attr,
- &dev_attr_prs.attr,
- &dev_attr_rie.attr,
- &dev_attr_wie.attr,
- &dev_attr_kse.attr,
- NULL,
-};
-
-static const struct attribute_group
-ds1685_rtc_sysfs_ctrl4b_grp = {
- .name = "ctrl4b",
- .attrs = ds1685_rtc_sysfs_ctrl4b_attrs,
-};
-#endif /* CONFIG_RTC_DS1685_SYSFS_REGS */
-
-
/**
* ds1685_rtc_sysfs_register - register sysfs files.
* @dev: pointer to device structure.
@@ -1480,31 +1145,6 @@ ds1685_rtc_sysfs_register(struct device *dev)
if (ret)
return ret;
-#ifdef CONFIG_RTC_DS1685_SYSFS_REGS
- ret = sysfs_create_group(&dev->kobj, &ds1685_rtc_sysfs_ctrla_grp);
- if (ret)
- return ret;
-
- ret = sysfs_create_group(&dev->kobj, &ds1685_rtc_sysfs_ctrlb_grp);
- if (ret)
- return ret;
-
- ret = sysfs_create_group(&dev->kobj, &ds1685_rtc_sysfs_ctrlc_grp);
- if (ret)
- return ret;
-
- ret = sysfs_create_group(&dev->kobj, &ds1685_rtc_sysfs_ctrld_grp);
- if (ret)
- return ret;
-
- ret = sysfs_create_group(&dev->kobj, &ds1685_rtc_sysfs_ctrl4a_grp);
- if (ret)
- return ret;
-
- ret = sysfs_create_group(&dev->kobj, &ds1685_rtc_sysfs_ctrl4b_grp);
- if (ret)
- return ret;
-#endif
return 0;
}
@@ -1518,15 +1158,6 @@ ds1685_rtc_sysfs_unregister(struct device *dev)
sysfs_remove_bin_file(&dev->kobj, &ds1685_rtc_sysfs_nvram_attr);
sysfs_remove_group(&dev->kobj, &ds1685_rtc_sysfs_misc_grp);
-#ifdef CONFIG_RTC_DS1685_SYSFS_REGS
- sysfs_remove_group(&dev->kobj, &ds1685_rtc_sysfs_ctrla_grp);
- sysfs_remove_group(&dev->kobj, &ds1685_rtc_sysfs_ctrlb_grp);
- sysfs_remove_group(&dev->kobj, &ds1685_rtc_sysfs_ctrlc_grp);
- sysfs_remove_group(&dev->kobj, &ds1685_rtc_sysfs_ctrld_grp);
- sysfs_remove_group(&dev->kobj, &ds1685_rtc_sysfs_ctrl4a_grp);
- sysfs_remove_group(&dev->kobj, &ds1685_rtc_sysfs_ctrl4b_grp);
-#endif
-
return 0;
}
#endif /* CONFIG_SYSFS */
--
2.17.1