Commit b797a555 authored by Mark Brown's avatar Mark Brown Committed by Samuel Ortiz

mfd: Refactor WM8350 chip identification

Since the WM8350 driver was originally written the semantics for the
identification registers of the chip have been clarified, allowing
us to do an exact match on all the fields. This avoids mistakenly
running on unsupported hardware.

Also change to using the datasheet names more consistently for
legibility and fix a printk() that should be dev_err().
Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: default avatarSamuel Ortiz <sameo@openedhand.com>
parent d756f4a4
...@@ -1227,52 +1227,72 @@ int wm8350_device_init(struct wm8350 *wm8350, int irq, ...@@ -1227,52 +1227,72 @@ int wm8350_device_init(struct wm8350 *wm8350, int irq,
struct wm8350_platform_data *pdata) struct wm8350_platform_data *pdata)
{ {
int ret = -EINVAL; int ret = -EINVAL;
u16 id1, id2, mask, mode; u16 id1, id2, mask_rev;
u16 cust_id, mode, chip_rev;
/* get WM8350 revision and config mode */ /* get WM8350 revision and config mode */
wm8350->read_dev(wm8350, WM8350_RESET_ID, sizeof(id1), &id1); wm8350->read_dev(wm8350, WM8350_RESET_ID, sizeof(id1), &id1);
wm8350->read_dev(wm8350, WM8350_ID, sizeof(id2), &id2); wm8350->read_dev(wm8350, WM8350_ID, sizeof(id2), &id2);
wm8350->read_dev(wm8350, WM8350_REVISION, sizeof(mask_rev), &mask_rev);
id1 = be16_to_cpu(id1); id1 = be16_to_cpu(id1);
id2 = be16_to_cpu(id2); id2 = be16_to_cpu(id2);
mask_rev = be16_to_cpu(mask_rev);
if (id1 == 0x6143) { if (id1 != 0x6143) {
switch ((id2 & WM8350_CHIP_REV_MASK) >> 12) { dev_err(wm8350->dev,
"Device with ID %x is not a WM8350\n", id1);
ret = -ENODEV;
goto err;
}
mode = id2 & WM8350_CONF_STS_MASK >> 10;
cust_id = id2 & WM8350_CUST_ID_MASK;
chip_rev = (id2 & WM8350_CHIP_REV_MASK) >> 12;
dev_info(wm8350->dev,
"CONF_STS %d, CUST_ID %d, MASK_REV %d, CHIP_REV %d\n",
mode, cust_id, mask_rev, chip_rev);
if (cust_id != 0) {
dev_err(wm8350->dev, "Unsupported CUST_ID\n");
ret = -ENODEV;
goto err;
}
switch (mask_rev) {
case 0:
switch (chip_rev) {
case WM8350_REV_E: case WM8350_REV_E:
dev_info(wm8350->dev, "Found Rev E device\n"); dev_info(wm8350->dev, "WM8350 Rev E\n");
break; break;
case WM8350_REV_F: case WM8350_REV_F:
dev_info(wm8350->dev, "Found Rev F device\n"); dev_info(wm8350->dev, "WM8350 Rev F\n");
break; break;
case WM8350_REV_G: case WM8350_REV_G:
dev_info(wm8350->dev, "Found Rev G device\n"); dev_info(wm8350->dev, "WM8350 Rev G\n");
wm8350->power.rev_g_coeff = 1; wm8350->power.rev_g_coeff = 1;
break; break;
case WM8350_REV_H: case WM8350_REV_H:
dev_info(wm8350->dev, "Found Rev H device\n"); dev_info(wm8350->dev, "WM8350 Rev H\n");
wm8350->power.rev_g_coeff = 1; wm8350->power.rev_g_coeff = 1;
break; break;
default: default:
/* For safety we refuse to run on unknown hardware */ /* For safety we refuse to run on unknown hardware */
dev_info(wm8350->dev, "Found unknown rev %x\n", dev_err(wm8350->dev, "Unknown WM8350 CHIP_REV\n");
(id2 & WM8350_CHIP_REV_MASK) >> 12);
ret = -ENODEV; ret = -ENODEV;
goto err; goto err;
} }
} else { break;
dev_info(wm8350->dev, "Device with ID %x is not a WM8350\n",
id1); default:
dev_err(wm8350->dev, "Unknown MASK_REV\n");
ret = -ENODEV; ret = -ENODEV;
goto err; goto err;
} }
mode = id2 & WM8350_CONF_STS_MASK >> 10;
mask = id2 & WM8350_CUST_ID_MASK;
dev_info(wm8350->dev, "Config mode %d, ROM mask %d\n", mode, mask);
ret = wm8350_create_cache(wm8350, mode); ret = wm8350_create_cache(wm8350, mode);
if (ret < 0) { if (ret < 0) {
printk(KERN_ERR "wm8350: failed to create register cache\n"); dev_err(wm8350->dev, "Failed to create register cache\n");
return ret; return ret;
} }
......
...@@ -29,6 +29,7 @@ ...@@ -29,6 +29,7 @@
*/ */
#define WM8350_RESET_ID 0x00 #define WM8350_RESET_ID 0x00
#define WM8350_ID 0x01 #define WM8350_ID 0x01
#define WM8350_REVISION 0x02
#define WM8350_SYSTEM_CONTROL_1 0x03 #define WM8350_SYSTEM_CONTROL_1 0x03
#define WM8350_SYSTEM_CONTROL_2 0x04 #define WM8350_SYSTEM_CONTROL_2 0x04
#define WM8350_SYSTEM_HIBERNATE 0x05 #define WM8350_SYSTEM_HIBERNATE 0x05
...@@ -79,6 +80,11 @@ ...@@ -79,6 +80,11 @@
#define WM8350_CONF_STS_MASK 0x0C00 #define WM8350_CONF_STS_MASK 0x0C00
#define WM8350_CUST_ID_MASK 0x00FF #define WM8350_CUST_ID_MASK 0x00FF
/*
* R2 (0x02) - Revision
*/
#define WM8350_MASK_REV_MASK 0x00FF
/* /*
* R3 (0x03) - System Control 1 * R3 (0x03) - System Control 1
*/ */
......
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