From b797a5551979da22b0a35632198ffc8a330d9537 Mon Sep 17 00:00:00 2001 From: Mark Brown Date: Mon, 24 Nov 2008 20:22:58 +0100 Subject: 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: Mark Brown Signed-off-by: Samuel Ortiz --- drivers/mfd/wm8350-core.c | 54 ++++++++++++++++++++++++++++------------- include/linux/mfd/wm8350/core.h | 6 +++++ 2 files changed, 43 insertions(+), 17 deletions(-) diff --git a/drivers/mfd/wm8350-core.c b/drivers/mfd/wm8350-core.c index 764bf15ea68..2188d759cbd 100644 --- a/drivers/mfd/wm8350-core.c +++ b/drivers/mfd/wm8350-core.c @@ -1227,52 +1227,72 @@ int wm8350_device_init(struct wm8350 *wm8350, int irq, struct wm8350_platform_data *pdata) { 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 */ wm8350->read_dev(wm8350, WM8350_RESET_ID, sizeof(id1), &id1); 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); id2 = be16_to_cpu(id2); + mask_rev = be16_to_cpu(mask_rev); - if (id1 == 0x6143) { - switch ((id2 & WM8350_CHIP_REV_MASK) >> 12) { + if (id1 != 0x6143) { + 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: - dev_info(wm8350->dev, "Found Rev E device\n"); + dev_info(wm8350->dev, "WM8350 Rev E\n"); break; case WM8350_REV_F: - dev_info(wm8350->dev, "Found Rev F device\n"); + dev_info(wm8350->dev, "WM8350 Rev F\n"); break; 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; break; 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; break; default: /* For safety we refuse to run on unknown hardware */ - dev_info(wm8350->dev, "Found unknown rev %x\n", - (id2 & WM8350_CHIP_REV_MASK) >> 12); + dev_err(wm8350->dev, "Unknown WM8350 CHIP_REV\n"); ret = -ENODEV; goto err; } - } else { - dev_info(wm8350->dev, "Device with ID %x is not a WM8350\n", - id1); + break; + + default: + dev_err(wm8350->dev, "Unknown MASK_REV\n"); ret = -ENODEV; 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); 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; } diff --git a/include/linux/mfd/wm8350/core.h b/include/linux/mfd/wm8350/core.h index 3c9735663f3..2a7abeebe77 100644 --- a/include/linux/mfd/wm8350/core.h +++ b/include/linux/mfd/wm8350/core.h @@ -29,6 +29,7 @@ */ #define WM8350_RESET_ID 0x00 #define WM8350_ID 0x01 +#define WM8350_REVISION 0x02 #define WM8350_SYSTEM_CONTROL_1 0x03 #define WM8350_SYSTEM_CONTROL_2 0x04 #define WM8350_SYSTEM_HIBERNATE 0x05 @@ -79,6 +80,11 @@ #define WM8350_CONF_STS_MASK 0x0C00 #define WM8350_CUST_ID_MASK 0x00FF +/* + * R2 (0x02) - Revision + */ +#define WM8350_MASK_REV_MASK 0x00FF + /* * R3 (0x03) - System Control 1 */ -- cgit v1.2.3