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path: root/drivers/misc/ab8500-pwm.c
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Diffstat (limited to 'drivers/misc/ab8500-pwm.c')
-rw-r--r--drivers/misc/ab8500-pwm.c211
1 files changed, 202 insertions, 9 deletions
diff --git a/drivers/misc/ab8500-pwm.c b/drivers/misc/ab8500-pwm.c
index d7a9aa14e5d..9d864e4db5a 100644
--- a/drivers/misc/ab8500-pwm.c
+++ b/drivers/misc/ab8500-pwm.c
@@ -8,10 +8,11 @@
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/pwm.h>
+#include <linux/clk.h>
#include <linux/mfd/abx500.h>
#include <linux/mfd/abx500/ab8500.h>
#include <linux/module.h>
-
+#include <linux/mfd/ab8500/pwmleds.h>
/*
* PWM Out generators
* Bank: 0x10
@@ -19,6 +20,11 @@
#define AB8500_PWM_OUT_CTRL1_REG 0x60
#define AB8500_PWM_OUT_CTRL2_REG 0x61
#define AB8500_PWM_OUT_CTRL7_REG 0x66
+#define AB8505_PWM_OUT_BLINK_CTRL1_REG 0x68
+#define AB8505_PWM_OUT_BLINK_CTRL4_REG 0x6B
+#define AB8505_PWM_OUT_BLINK_CTRL_DUTYBIT 4
+#define AB8505_PWM_OUT_BLINK_DUTYMASK (0x0F << AB8505_PWM_OUT_BLINK_CTRL_DUTYBIT)
+
/* backlight driver constants */
#define ENABLE_PWM 1
@@ -27,12 +33,73 @@
struct pwm_device {
struct device *dev;
struct list_head node;
+ struct clk *clk;
const char *label;
unsigned int pwm_id;
+ unsigned int num_pwm;
+ unsigned int blink_en;
+ struct ab8500 *parent;
+ bool clk_enabled;
};
static LIST_HEAD(pwm_list);
+int pwm_config_blink(struct pwm_device *pwm, int duty_ns, int period_ns)
+{
+ int ret;
+ unsigned int value;
+ u8 reg;
+ if ((!is_ab8505(pwm->parent)) || (!pwm->blink_en)) {
+ dev_err(pwm->dev, "setting blinking for this "
+ "device not supported\n");
+ return -EINVAL;
+ }
+ /*
+ * get the period value that is to be written to
+ * AB8500_PWM_OUT_BLINK_CTRL1 REGS[0:2]
+ */
+ value = period_ns & 0x07;
+ /*
+ * get blink duty value to be written to
+ * AB8500_PWM_OUT_BLINK_CTRL REGS[7:4]
+ */
+ value |= ((duty_ns << AB8505_PWM_OUT_BLINK_CTRL_DUTYBIT) &
+ AB8505_PWM_OUT_BLINK_DUTYMASK);
+
+ reg = AB8505_PWM_OUT_BLINK_CTRL1_REG + (pwm->pwm_id - 1);
+
+ ret = abx500_set_register_interruptible(pwm->dev, AB8500_MISC,
+ reg, (u8)value);
+ if (ret < 0)
+ dev_err(pwm->dev, "%s: Failed to config PWM blink,Error %d\n",
+ pwm->label, ret);
+ return ret;
+}
+EXPORT_SYMBOL(pwm_config_blink);
+
+int pwm_blink_ctrl(struct pwm_device *pwm , int enable)
+{
+ int ret;
+
+ if ((!is_ab8505(pwm->parent)) || (!pwm->blink_en)) {
+ dev_err(pwm->dev, "setting blinking for this "
+ "device not supported\n");
+ return -EINVAL;
+ }
+ /*
+ * Enable/disable blinking feature for corresponding PWMOUT
+ * channel depending on value of enable.
+ */
+ ret = abx500_mask_and_set_register_interruptible(pwm->dev,
+ AB8500_MISC, AB8505_PWM_OUT_BLINK_CTRL4_REG,
+ 1 << (pwm->pwm_id-1), enable << (pwm->pwm_id-1));
+ if (ret < 0)
+ dev_err(pwm->dev, "%s: Failed to control PWM blink,Error %d\n",
+ pwm->label, ret);
+ return ret;
+}
+EXPORT_SYMBOL(pwm_blink_ctrl);
+
int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
{
int ret = 0;
@@ -67,11 +134,19 @@ int pwm_enable(struct pwm_device *pwm)
{
int ret;
+ if (!pwm->clk_enabled) {
+ ret = clk_enable(pwm->clk);
+ if (ret < 0) {
+ dev_err(pwm->dev, "failed to enable clock\n");
+ return ret;
+ }
+ pwm->clk_enabled = true;
+ }
ret = abx500_mask_and_set_register_interruptible(pwm->dev,
AB8500_MISC, AB8500_PWM_OUT_CTRL7_REG,
- 1 << (pwm->pwm_id-1), ENABLE_PWM);
+ 1 << (pwm->pwm_id-1), 1 << (pwm->pwm_id-1));
if (ret < 0)
- dev_err(pwm->dev, "%s: Failed to disable PWM, Error %d\n",
+ dev_err(pwm->dev, "%s: Failed to enable PWM, Error %d\n",
pwm->label, ret);
return ret;
}
@@ -84,9 +159,27 @@ void pwm_disable(struct pwm_device *pwm)
ret = abx500_mask_and_set_register_interruptible(pwm->dev,
AB8500_MISC, AB8500_PWM_OUT_CTRL7_REG,
1 << (pwm->pwm_id-1), DISABLE_PWM);
+ /*
+ * Workaround to set PWM in disable.
+ * If enable bit is not toggled the PWM might output 50/50 duty cycle
+ * even though it should be disabled
+ */
+ ret &= abx500_mask_and_set_register_interruptible(pwm->dev,
+ AB8500_MISC, AB8500_PWM_OUT_CTRL7_REG,
+ 1 << (pwm->pwm_id-1),
+ ENABLE_PWM << (pwm->pwm_id-1));
+ ret &= abx500_mask_and_set_register_interruptible(pwm->dev,
+ AB8500_MISC, AB8500_PWM_OUT_CTRL7_REG,
+ 1 << (pwm->pwm_id-1), DISABLE_PWM);
+
if (ret < 0)
dev_err(pwm->dev, "%s: Failed to disable PWM, Error %d\n",
pwm->label, ret);
+ if (pwm->clk_enabled) {
+ clk_disable(pwm->clk);
+ pwm->clk_enabled = false;
+ }
+
return;
}
EXPORT_SYMBOL(pwm_disable);
@@ -94,7 +187,6 @@ EXPORT_SYMBOL(pwm_disable);
struct pwm_device *pwm_request(int pwm_id, const char *label)
{
struct pwm_device *pwm;
-
list_for_each_entry(pwm, &pwm_list, node) {
if (pwm->pwm_id == pwm_id) {
pwm->label = label;
@@ -113,30 +205,131 @@ void pwm_free(struct pwm_device *pwm)
}
EXPORT_SYMBOL(pwm_free);
+static ssize_t store_blink_status(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct pwm_device *pwm;
+ unsigned long val;
+
+ if (strict_strtoul(buf, 0, &val))
+ return -EINVAL;
+ list_for_each_entry(pwm, &pwm_list, node) {
+ if (pwm->pwm_id == val)
+ break;
+ else {
+ /* check if PWM ID is valid*/
+ if (val > pwm->num_pwm) {
+ dev_err(pwm->dev, "Invalid PWM ID\n");
+ return -EINVAL;
+ }
+ }
+ }
+ if ((!is_ab8505(pwm->parent)) || (!pwm->blink_en)) {
+ dev_err(pwm->dev, "setting blinking for this "
+ "device not supported\n");
+ return -EINVAL;
+ }
+ /*Disable blink functionlity */
+ pwm_blink_ctrl(pwm, 0);
+ return count;
+}
+
+static DEVICE_ATTR(disable_blink, S_IWUGO, NULL, store_blink_status);
+
+static struct attribute *pwmled_attributes[] = {
+ &dev_attr_disable_blink.attr,
+ NULL
+};
+
+static const struct attribute_group pwmled_attr_group = {
+ .attrs = pwmled_attributes,
+};
+
static int __devinit ab8500_pwm_probe(struct platform_device *pdev)
{
+ struct ab8500 *parent = dev_get_drvdata(pdev->dev.parent);
+ struct ab8500_platform_data *plat = dev_get_platdata(parent->dev);
+ struct ab8500_pwmled_platform_data *pdata;
struct pwm_device *pwm;
+ int ret = 0 , i;
+
+ /* get pwmled specific platform data */
+ if (!plat->pwmled) {
+ dev_err(&pdev->dev, "no pwm platform data supplied\n");
+ return -EINVAL;
+ }
+ pdata = plat->pwmled;
/*
* Nothing to be done in probe, this is required to get the
* device which is required for ab8500 read and write
*/
- pwm = kzalloc(sizeof(struct pwm_device), GFP_KERNEL);
+ pwm = kzalloc(((sizeof(struct pwm_device)) * pdata->num_pwm),
+ GFP_KERNEL);
if (pwm == NULL) {
dev_err(&pdev->dev, "failed to allocate memory\n");
return -ENOMEM;
}
- pwm->dev = &pdev->dev;
- pwm->pwm_id = pdev->id;
- list_add_tail(&pwm->node, &pwm_list);
+ for (i = 0; i < pdata->num_pwm; i++) {
+ pwm[i].dev = &pdev->dev;
+ pwm[i].parent = parent;
+ pwm[i].blink_en = pdata->leds[i].blink_en;
+ pwm[i].pwm_id = pdata->leds[i].pwm_id;
+ pwm[i].num_pwm = pdata->num_pwm;
+ list_add_tail(&pwm[i].node, &pwm_list);
+ }
+ for (i = 0; i < pdata->num_pwm; i++) {
+ /*Implement sysfs only if blink is enabled*/
+ if ((is_ab8505(pwm[i].parent)) && (pwm[i].blink_en)) {
+ /* sysfs implementation to disable the blink */
+ ret = sysfs_create_group(&pdev->dev.kobj,
+ &pwmled_attr_group);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to create"
+ " sysfs entries\n");
+ goto fail;
+ }
+ break;
+ }
+ }
+ pwm->clk = clk_get(pwm->dev, NULL);
+ if (IS_ERR(pwm->clk)) {
+ dev_err(pwm->dev, "clock request failed\n");
+ ret = PTR_ERR(pwm->clk);
+ goto err_clk;
+ }
platform_set_drvdata(pdev, pwm);
+ pwm->clk_enabled = false;
dev_dbg(pwm->dev, "pwm probe successful\n");
- return 0;
+ return ret;
+
+err_clk:
+ for (i = 0; i < pdata->num_pwm; i++) {
+ if ((is_ab8505(pwm[i].parent)) && (pwm[i].blink_en)) {
+ sysfs_remove_group(&pdev->dev.kobj,
+ &pwmled_attr_group);
+ break;
+ }
+ }
+fail:
+ list_del(&pwm->node);
+ kfree(pwm);
+ return ret;
}
static int __devexit ab8500_pwm_remove(struct platform_device *pdev)
{
struct pwm_device *pwm = platform_get_drvdata(pdev);
+ int i;
+
+ for (i = 0; i < pwm->num_pwm; i++) {
+ if ((is_ab8505(pwm[i].parent)) && (pwm[i].blink_en)) {
+ sysfs_remove_group(&pdev->dev.kobj,
+ &pwmled_attr_group);
+ break;
+ }
+ }
list_del(&pwm->node);
+ clk_put(pwm->clk);
dev_dbg(&pdev->dev, "pwm driver removed\n");
kfree(pwm);
return 0;
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-16 13:30:19 +0000