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authorMark Brown <broonie@opensource.wolfsonmicro.com>2013-04-02 01:03:06 +0400
committerMark Brown <broonie@opensource.wolfsonmicro.com>2013-04-02 14:53:51 +0400
commit6fed4d869a11fdbb4c6a5e444dfb2c22f92c3e46 (patch)
tree53c3e4ec22ae7a35c0a209ba4c2300b8743a07cd /drivers/extcon
parent84eaa13616b6e7d001b7f7b909228087779b677b (diff)
downloadlinux-6fed4d869a11fdbb4c6a5e444dfb2c22f92c3e46.tar.xz
extcon: arizona: Allow configuration of button detection
The Arizona button detection circuit is configurable, allowing the system integrator to program a range of thresholds for the buttons supported on the accessory but currently the driver uses the default button ranges and does not provide any flexibility in how this is exposed to the application layer. Provide platform data allowing the user to control this and to map the buttons to keys in the input subsystem. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'drivers/extcon')
-rw-r--r--drivers/extcon/extcon-arizona.c164
1 files changed, 125 insertions, 39 deletions
diff --git a/drivers/extcon/extcon-arizona.c b/drivers/extcon/extcon-arizona.c
index 4bb0e9ae405d..e2339629126a 100644
--- a/drivers/extcon/extcon-arizona.c
+++ b/drivers/extcon/extcon-arizona.c
@@ -33,7 +33,7 @@
#include <linux/mfd/arizona/pdata.h>
#include <linux/mfd/arizona/registers.h>
-#define ARIZONA_NUM_BUTTONS 6
+#define ARIZONA_MAX_MICD_RANGE 8
#define ARIZONA_ACCDET_MODE_MIC 0
#define ARIZONA_ACCDET_MODE_HPL 1
@@ -50,6 +50,9 @@ struct arizona_extcon_info {
const struct arizona_micd_config *micd_modes;
int micd_num_modes;
+ const struct arizona_micd_range *micd_ranges;
+ int num_micd_ranges;
+
bool micd_reva;
bool micd_clamp;
@@ -71,20 +74,25 @@ struct arizona_extcon_info {
};
static const struct arizona_micd_config micd_default_modes[] = {
- { 0, 2 << ARIZONA_MICD_BIAS_SRC_SHIFT, 1 },
{ ARIZONA_ACCDET_SRC, 1 << ARIZONA_MICD_BIAS_SRC_SHIFT, 0 },
+ { 0, 2 << ARIZONA_MICD_BIAS_SRC_SHIFT, 1 },
};
-static struct {
- u16 status;
- int report;
-} arizona_lvl_to_key[ARIZONA_NUM_BUTTONS] = {
- { 0x1, BTN_0 },
- { 0x2, BTN_1 },
- { 0x4, BTN_2 },
- { 0x8, BTN_3 },
- { 0x10, BTN_4 },
- { 0x20, BTN_5 },
+static const struct arizona_micd_range micd_default_ranges[] = {
+ { .max = 11, .key = BTN_0 },
+ { .max = 28, .key = BTN_1 },
+ { .max = 54, .key = BTN_2 },
+ { .max = 100, .key = BTN_3 },
+ { .max = 186, .key = BTN_4 },
+ { .max = 430, .key = BTN_5 },
+};
+
+static const int arizona_micd_levels[] = {
+ 3, 6, 8, 11, 13, 16, 18, 21, 23, 26, 28, 31, 34, 36, 39, 41, 44, 46,
+ 49, 52, 54, 57, 60, 62, 65, 67, 70, 73, 75, 78, 81, 83, 89, 94, 100,
+ 105, 111, 116, 122, 127, 139, 150, 161, 173, 186, 196, 209, 220, 245,
+ 270, 295, 321, 348, 375, 402, 430, 489, 550, 614, 681, 752, 903, 1071,
+ 1257,
};
#define ARIZONA_CABLE_MECHANICAL 0
@@ -153,7 +161,7 @@ static void arizona_extcon_set_mode(struct arizona_extcon_info *info, int mode)
{
struct arizona *arizona = info->arizona;
- mode %= info->num_micd_modes;
+ mode %= info->micd_num_modes;
if (arizona->pdata.micd_pol_gpio > 0)
gpio_set_value_cansleep(arizona->pdata.micd_pol_gpio,
@@ -728,7 +736,7 @@ static irqreturn_t arizona_micdet(int irq, void *data)
struct arizona_extcon_info *info = data;
struct arizona *arizona = info->arizona;
unsigned int val, lvl;
- int ret, i;
+ int ret, i, key;
mutex_lock(&info->lock);
@@ -815,12 +823,13 @@ static irqreturn_t arizona_micdet(int irq, void *data)
lvl = val & ARIZONA_MICD_LVL_MASK;
lvl >>= ARIZONA_MICD_LVL_SHIFT;
- for (i = 0; i < ARIZONA_NUM_BUTTONS; i++)
- if (lvl & arizona_lvl_to_key[i].status)
- input_report_key(info->input,
- arizona_lvl_to_key[i].report,
- 1);
- input_sync(info->input);
+ WARN_ON(!lvl);
+ WARN_ON(ffs(lvl) - 1 >= info->num_micd_ranges);
+ if (lvl && ffs(lvl) - 1 < info->num_micd_ranges) {
+ key = info->micd_ranges[ffs(lvl) - 1].key;
+ input_report_key(info->input, key, 1);
+ input_sync(info->input);
+ }
} else if (info->detecting) {
dev_dbg(arizona->dev, "Headphone detected\n");
@@ -834,9 +843,9 @@ static irqreturn_t arizona_micdet(int irq, void *data)
}
} else {
dev_dbg(arizona->dev, "Mic button released\n");
- for (i = 0; i < ARIZONA_NUM_BUTTONS; i++)
+ for (i = 0; i < info->num_micd_ranges; i++)
input_report_key(info->input,
- arizona_lvl_to_key[i].report, 0);
+ info->micd_ranges[i].key, 0);
input_sync(info->input);
arizona_extcon_pulse_micbias(info);
}
@@ -923,9 +932,9 @@ static irqreturn_t arizona_jackdet(int irq, void *data)
info->mic = false;
info->hpdet_done = false;
- for (i = 0; i < ARIZONA_NUM_BUTTONS; i++)
+ for (i = 0; i < info->num_micd_ranges; i++)
input_report_key(info->input,
- arizona_lvl_to_key[i].report, 0);
+ info->micd_ranges[i].key, 0);
input_sync(info->input);
ret = extcon_update_state(&info->edev, 0xffffffff, 0);
@@ -954,13 +963,33 @@ static irqreturn_t arizona_jackdet(int irq, void *data)
return IRQ_HANDLED;
}
+/* Map a level onto a slot in the register bank */
+static void arizona_micd_set_level(struct arizona *arizona, int index,
+ unsigned int level)
+{
+ int reg;
+ unsigned int mask;
+
+ reg = ARIZONA_MIC_DETECT_LEVEL_4 - (index / 2);
+
+ if (!(index % 2)) {
+ mask = 0x3f00;
+ level <<= 8;
+ } else {
+ mask = 0x3f;
+ }
+
+ /* Program the level itself */
+ regmap_update_bits(arizona->regmap, reg, mask, level);
+}
+
static int arizona_extcon_probe(struct platform_device *pdev)
{
struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
struct arizona_pdata *pdata;
struct arizona_extcon_info *info;
int jack_irq_fall, jack_irq_rise;
- int ret, mode, i;
+ int ret, mode, i, j;
if (!arizona->dapm || !arizona->dapm->card)
return -EPROBE_DEFER;
@@ -1013,6 +1042,17 @@ static int arizona_extcon_probe(struct platform_device *pdev)
goto err;
}
+ info->input = devm_input_allocate_device(&pdev->dev);
+ if (!info->input) {
+ dev_err(arizona->dev, "Can't allocate input dev\n");
+ ret = -ENOMEM;
+ goto err_register;
+ }
+
+ info->input->name = "Headset";
+ info->input->phys = "arizona/extcon";
+ info->input->dev.parent = &pdev->dev;
+
if (pdata->num_micd_configs) {
info->micd_modes = pdata->micd_configs;
info->micd_num_modes = pdata->num_micd_configs;
@@ -1068,6 +1108,66 @@ static int arizona_extcon_probe(struct platform_device *pdev)
arizona->pdata.micd_dbtime
<< ARIZONA_MICD_DBTIME_SHIFT);
+ BUILD_BUG_ON(ARRAY_SIZE(arizona_micd_levels) != 0x40);
+
+ if (arizona->pdata.num_micd_ranges) {
+ info->micd_ranges = pdata->micd_ranges;
+ info->num_micd_ranges = pdata->num_micd_ranges;
+ } else {
+ info->micd_ranges = micd_default_ranges;
+ info->num_micd_ranges = ARRAY_SIZE(micd_default_ranges);
+ }
+
+ if (arizona->pdata.num_micd_ranges > ARIZONA_MAX_MICD_RANGE) {
+ dev_err(arizona->dev, "Too many MICD ranges: %d\n",
+ arizona->pdata.num_micd_ranges);
+ }
+
+ if (info->num_micd_ranges > 1) {
+ for (i = 1; i < info->num_micd_ranges; i++) {
+ if (info->micd_ranges[i - 1].max >
+ info->micd_ranges[i].max) {
+ dev_err(arizona->dev,
+ "MICD ranges must be sorted\n");
+ ret = -EINVAL;
+ goto err_input;
+ }
+ }
+ }
+
+ /* Disable all buttons by default */
+ regmap_update_bits(arizona->regmap, ARIZONA_MIC_DETECT_2,
+ ARIZONA_MICD_LVL_SEL_MASK, 0x81);
+
+ /* Set up all the buttons the user specified */
+ for (i = 0; i < info->num_micd_ranges; i++) {
+ for (j = 0; j < ARRAY_SIZE(arizona_micd_levels); j++)
+ if (arizona_micd_levels[j] >= info->micd_ranges[i].max)
+ break;
+
+ if (j == ARRAY_SIZE(arizona_micd_levels)) {
+ dev_err(arizona->dev, "Unsupported MICD level %d\n",
+ info->micd_ranges[i].max);
+ ret = -EINVAL;
+ goto err_input;
+ }
+
+ dev_dbg(arizona->dev, "%d ohms for MICD threshold %d\n",
+ arizona_micd_levels[j], i);
+
+ arizona_micd_set_level(arizona, i, j);
+ input_set_capability(info->input, EV_KEY,
+ info->micd_ranges[i].key);
+
+ /* Enable reporting of that range */
+ regmap_update_bits(arizona->regmap, ARIZONA_MIC_DETECT_2,
+ 1 << i, 1 << i);
+ }
+
+ /* Set all the remaining keys to a maximum */
+ for (; i < ARIZONA_MAX_MICD_RANGE; i++)
+ arizona_micd_set_level(arizona, i, 0x3f);
+
/*
* If we have a clamp use it, activating in conjunction with
* GPIO5 if that is connected for jack detect operation.
@@ -1095,20 +1195,6 @@ static int arizona_extcon_probe(struct platform_device *pdev)
arizona_extcon_set_mode(info, 0);
- info->input = devm_input_allocate_device(&pdev->dev);
- if (!info->input) {
- dev_err(arizona->dev, "Can't allocate input dev\n");
- ret = -ENOMEM;
- goto err_register;
- }
-
- for (i = 0; i < ARIZONA_NUM_BUTTONS; i++)
- input_set_capability(info->input, EV_KEY,
- arizona_lvl_to_key[i].report);
- info->input->name = "Headset";
- info->input->phys = "arizona/extcon";
- info->input->dev.parent = &pdev->dev;
-
pm_runtime_enable(&pdev->dev);
pm_runtime_idle(&pdev->dev);
pm_runtime_get_sync(&pdev->dev);