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Re: Yet another direct config proposal for i2c busses
I had only positive feedback on the proposal so far.
Attached is a updated version of the MI parts.
I did a bit of cleanup and added a way to pass device dependend "cookies"
trough to the i2c devices - I need this in a machine specific driver, and it
seems to be the simplest way to do this (actually I haven't found any other
sensible way). For machines using OpenFirmware this would be the OF node of
the i2c device, for others it could be a pointer to some ACPI table entry or
whatever.
I intend to commit this sometime later next week, it is blocking the addition
of a few drivers urgently needed to make some machines usefull.
Martin
Index: dev/ofw/openfirm.h
===================================================================
RCS file: /cvsroot/src/sys/dev/ofw/openfirm.h,v
retrieving revision 1.27
diff -c -u -p -r1.27 openfirm.h
--- dev/ofw/openfirm.h 11 Nov 2009 16:56:52 -0000 1.27
+++ dev/ofw/openfirm.h 21 Feb 2010 13:25:53 -0000
@@ -115,4 +115,6 @@ boolean_t of_to_dataprop(prop_dictionary
int *of_network_decode_media(int, int *, int *);
char *of_get_mode_string(char *, int);
+void of_enter_i2c_devs(prop_dictionary_t, int);
+
#endif /*_OPENFIRM_H_*/
Index: dev/ofw/ofw_subr.c
===================================================================
RCS file: /cvsroot/src/sys/dev/ofw/ofw_subr.c,v
retrieving revision 1.16
diff -c -u -p -r1.16 ofw_subr.c
--- dev/ofw/ofw_subr.c 21 Jan 2010 15:56:08 -0000 1.16
+++ dev/ofw/ofw_subr.c 21 Feb 2010 13:25:53 -0000
@@ -325,3 +325,60 @@ of_get_mode_string(char *buffer, int len
strncpy(buffer, pos + 2, len);
return buffer;
}
+
+/*
+ * Iterate over the subtree of a i2c controller node.
+ * Add all sub-devices into an array as part of the controller's
+ * device properties.
+ * This is used by the i2c bus attach code to do direct configuration.
+ */
+void
+of_enter_i2c_devs(prop_dictionary_t props, int ofnode)
+{
+ int node, len;
+ char name[32];
+ uint64_t r64;
+ uint64_t r32;
+ uint8_t smr[24];
+ prop_array_t array;
+ prop_dictionary_t dev;
+
+ array = prop_array_create();
+
+ for (node = OF_child(ofnode); node; node = OF_peer(node)) {
+ if (OF_getprop(node, "name", name, sizeof(name)) <= 0)
+ continue;
+ len = OF_getproplen(node, "reg");
+ if (len == sizeof(r64)) {
+ if (OF_getprop(node, "reg", &r64, sizeof(r64))
+ != sizeof(r64))
+ continue;
+ r32 = r64;
+ } else if (len == sizeof(r32)) {
+ if (OF_getprop(node, "reg", &r32, sizeof(r32))
+ != sizeof(r32))
+ continue;
+ } else if (len == 24) {
+ if (OF_getprop(node, "reg", smr, sizeof(smr))
+ != sizeof(smr))
+ continue;
+ /* smbus reg property */
+ r32 = smr[7];
+ } else {
+ panic("unexpected \"reg\" size %d for \"%s\", "
+ "parent %x, node %x",
+ len, name, ofnode, node);
+ }
+
+ dev = prop_dictionary_create();
+ prop_dictionary_set_cstring(dev, "name", name);
+ prop_dictionary_set_uint32(dev, "addr", r32 >> 1);
+ prop_dictionary_set_uint64(dev, "cookie", node);
+ of_to_dataprop(dev, node, "compatible", "compatible");
+ prop_array_add(array, dev);
+ prop_object_release(dev);
+ }
+
+ prop_dictionary_set(props, "i2c-child-devices", array);
+ prop_object_release(array);
+}
Index: dev/i2c/i2cvar.h
===================================================================
RCS file: /cvsroot/src/sys/dev/i2c/i2cvar.h,v
retrieving revision 1.6
diff -c -u -p -r1.6 i2cvar.h
--- dev/i2c/i2cvar.h 9 Jul 2007 21:00:33 -0000 1.6
+++ dev/i2c/i2cvar.h 21 Feb 2010 13:25:53 -0000
@@ -118,12 +118,29 @@ struct i2c_attach_args {
i2c_addr_t ia_addr; /* address of device */
int ia_size; /* size (for EEPROMs) */
int ia_type; /* bus type */
+ /* only set if using direct config */
+ const char * ia_name; /* name of the device */
+ int ia_ncompat; /* number of pointers in the
+ ia_compat array */
+ const char ** ia_compat; /* chip names */
+ /*
+ * The following is of limited usefullness and should only be used
+ * in rare cases where we realy know what we are doing. Example:
+ * a machine depended i2c driver (located in sys/arch/$arch/dev)
+ * needing to access some firmware properties.
+ * Depending on the firmware in use, an identifier for the device
+ * may be present. Example: on OpenFirmware machines the device
+ * tree OF node - if available. This info is hard to transport
+ * down to MD drivers through the MI i2c bus otherwise.
+ */
+ uintptr_t ia_cookie; /* OF node in openfirmware machines */
};
/*
* API presented to i2c controllers.
*/
int iicbus_print(void *, const char *);
+int iic_compat_match(struct i2c_attach_args*, const char **);
#ifdef _I2C_PRIVATE
/*
Index: dev/i2c/i2c.c
===================================================================
RCS file: /cvsroot/src/sys/dev/i2c/i2c.c,v
retrieving revision 1.23
diff -c -u -p -r1.23 i2c.c
--- dev/i2c/i2c.c 3 Feb 2009 16:41:31 -0000 1.23
+++ dev/i2c/i2c.c 21 Feb 2010 13:25:53 -0000
@@ -59,6 +59,8 @@ struct iic_softc {
};
static void iic_smbus_intr_thread(void *);
+static void iic_fill_compat(struct i2c_attach_args*, const char*,
+ size_t, char **);
int
iicbus_print(void *aux, const char *pnp)
@@ -71,6 +73,20 @@ iicbus_print(void *aux, const char *pnp)
}
static int
+iic_print_direct(void *aux, const char *pnp)
+{
+ struct i2c_attach_args *ia = aux;
+
+ if (pnp != NULL)
+ aprint_normal("%s at %s addr 0x%02x", ia->ia_name, pnp,
+ ia->ia_addr);
+ else
+ aprint_normal(" addr 0x%02x", ia->ia_addr);
+
+ return UNCONF;
+}
+
+static int
iic_print(void *aux, const char *pnp)
{
struct i2c_attach_args *ia = aux;
@@ -110,6 +126,8 @@ iic_attach(device_t parent, device_t sel
{
struct iic_softc *sc = device_private(self);
struct i2cbus_attach_args *iba = aux;
+ prop_array_t child_devices;
+ char *buf;
i2c_tag_t ic;
int rv;
@@ -196,11 +214,65 @@ iic_attach(device_t parent, device_t sel
if (!pmf_device_register(self, NULL, NULL))
aprint_error_dev(self, "couldn't establish power handler\n");
- /*
- * Attach all i2c devices described in the kernel
- * configuration file.
- */
- config_search_ia(iic_search, self, "iic", NULL);
+ child_devices = prop_dictionary_get(device_properties(parent),
+ "i2c-child-devices");
+ if (child_devices) {
+ unsigned int i, count;
+ prop_dictionary_t dev;
+ prop_data_t cdata;
+ uint32_t addr, size;
+ uint64_t cookie;
+ const char *name;
+ struct i2c_attach_args ia;
+ int loc[2];
+
+ memset(loc, 0, sizeof loc);
+ count = prop_array_count(child_devices);
+ for (i = 0; i < count; i++) {
+ dev = prop_array_get(child_devices, i);
+ if (!dev) continue;
+ if (!prop_dictionary_get_cstring_nocopy(
+ dev, "name", &name))
+ continue;
+ if (!prop_dictionary_get_uint32(dev, "addr", &addr))
+ continue;
+ if (!prop_dictionary_get_uint64(dev, "cookie", &cookie))
+ cookie = 0;
+ loc[0] = addr;
+ if (prop_dictionary_get_uint32(dev, "size", &size))
+ loc[1] = size;
+ else
+ loc[1] = -1;
+
+ memset(&ia, 0, sizeof ia);
+ ia.ia_addr = addr;
+ ia.ia_type = sc->sc_type;
+ ia.ia_tag = ic;
+ ia.ia_name = name;
+ ia.ia_cookie = cookie;
+
+ buf = NULL;
+ cdata = prop_dictionary_get(dev, "compatible");
+ if (cdata)
+ iic_fill_compat(&ia,
+ prop_data_data_nocopy(cdata),
+ prop_data_size(cdata), &buf);
+
+ config_found_sm_loc(self, "iic", loc, &ia,
+ iic_print_direct, NULL);
+
+ if (ia.ia_compat)
+ free(ia.ia_compat, M_TEMP);
+ if (buf)
+ free(buf, M_TEMP);
+ }
+ } else {
+ /*
+ * Attach all i2c devices described in the kernel
+ * configuration file.
+ */
+ config_search_ia(iic_search, self, "iic", NULL);
+ }
}
static void
@@ -303,5 +375,55 @@ iic_smbus_intr(i2c_tag_t ic)
return 1;
}
+static void
+iic_fill_compat(struct i2c_attach_args *ia, const char *compat, size_t len,
+ char **buffer)
+{
+ int count, i;
+ const char *c, *start, **ptr;
+
+ *buffer = NULL;
+ for (i = count = 0, c = compat; i < len; i++, c++)
+ if (*c == 0)
+ count++;
+ count += 2;
+ ptr = malloc(sizeof(char*)*count, M_TEMP, M_WAITOK);
+ if (!ptr) return;
+
+ for (i = count = 0, start = c = compat; i < len; i++, c++) {
+ if (*c == 0) {
+ ptr[count++] = start;
+ start = c+1;
+ }
+ }
+ if (start < compat+len) {
+ /* last string not 0 terminated */
+ size_t l = c-start;
+ *buffer = malloc(l+1, M_TEMP, M_WAITOK);
+ memcpy(*buffer, start, l);
+ (*buffer)[l] = 0;
+ ptr[count++] = *buffer;
+ }
+ ptr[count] = NULL;
+
+ ia->ia_compat = ptr;
+ ia->ia_ncompat = count;
+}
+
+int
+iic_compat_match(struct i2c_attach_args *ia, const char ** compats)
+{
+ int i;
+
+ for (; compats && *compats; compats++) {
+ for (i = 0; i < ia->ia_ncompat; i++) {
+ if (strcmp(*compats, ia->ia_compat[i]) == 0)
+ return 1;
+ }
+ }
+ return 0;
+}
+
+
CFATTACH_DECL_NEW(iic, sizeof(struct iic_softc),
iic_match, iic_attach, NULL, NULL);
Index: dev/i2c/spdmem.c
===================================================================
RCS file: /cvsroot/src/sys/dev/i2c/spdmem.c,v
retrieving revision 1.15
diff -c -u -p -r1.15 spdmem.c
--- dev/i2c/spdmem.c 9 May 2009 17:32:27 -0000 1.15
+++ dev/i2c/spdmem.c 21 Feb 2010 13:25:53 -0000
@@ -154,6 +154,7 @@ static uint16_t spdcrc16 (struct spdmem_
}
return (crc & 0xFFFF);
}
+
static int
spdmem_match(device_t parent, cfdata_t match, void *aux)
{
@@ -164,8 +165,17 @@ spdmem_match(device_t parent, cfdata_t m
int spd_len, spd_crc_cover;
uint16_t crc_calc, crc_spd;
- if ((ia->ia_addr & SPDMEM_ADDRMASK) != SPDMEM_ADDR)
- return 0;
+ if (ia->ia_name) {
+ /* add other names as we find more firmware variations */
+ if (strcmp(ia->ia_name, "dimm-spd"))
+ return 0;
+ }
+
+ /* only do this lame test when not using direct config */
+ if (ia->ia_name == NULL) {
+ if ((ia->ia_addr & SPDMEM_ADDRMASK) != SPDMEM_ADDR)
+ return 0;
+ }
sc.sc_tag = ia->ia_tag;
sc.sc_addr = ia->ia_addr;
Index: dev/i2c/adm1021.c
===================================================================
RCS file: /cvsroot/src/sys/dev/i2c/adm1021.c,v
retrieving revision 1.3
diff -c -u -p -r1.3 adm1021.c
--- dev/i2c/adm1021.c 5 Jun 2009 12:42:43 -0000 1.3
+++ dev/i2c/adm1021.c 21 Feb 2010 13:25:53 -0000
@@ -62,18 +62,35 @@ void admtemp_refresh(struct sysmon_envsy
CFATTACH_DECL_NEW(admtemp, sizeof(struct admtemp_softc),
admtemp_match, admtemp_attach, NULL, NULL);
+static const char * admtemp_compats[] = {
+ "i2c-max1617",
+ NULL
+};
int
admtemp_match(device_t parent, cfdata_t match, void *aux)
{
struct i2c_attach_args *ia = aux;
- if (((ia->ia_addr >= 0x18) && (ia->ia_addr <= 0x1a)) ||
- ((ia->ia_addr >= 0x29) && (ia->ia_addr <= 0x2b)) ||
- ((ia->ia_addr >= 0x4c) && (ia->ia_addr <= 0x4e)))
- return (1);
+ if (ia->ia_name == NULL) {
+ /*
+ * Indirect config - not much we can do!
+ * Check typical addresses.
+ */
+ if (((ia->ia_addr >= 0x18) && (ia->ia_addr <= 0x1a)) ||
+ ((ia->ia_addr >= 0x29) && (ia->ia_addr <= 0x2b)) ||
+ ((ia->ia_addr >= 0x4c) && (ia->ia_addr <= 0x4e)))
+ return (1);
+ } else {
+ /*
+ * Direct config - match via the list of compatible
+ * hardware.
+ */
+ if (iic_compat_match(ia, admtemp_compats))
+ return 1;
+ }
- return (0);
+ return 0;
}
Index: dev/i2c/lm75.c
===================================================================
RCS file: /cvsroot/src/sys/dev/i2c/lm75.c,v
retrieving revision 1.20
diff -c -u -p -r1.20 lm75.c
--- dev/i2c/lm75.c 9 Jan 2009 17:20:31 -0000 1.20
+++ dev/i2c/lm75.c 21 Feb 2010 13:25:53 -0000
@@ -71,6 +71,16 @@ static uint32_t lmtemp_decode_lm75(const
static uint32_t lmtemp_decode_ds75(const uint8_t *);
static uint32_t lmtemp_decode_lm77(const uint8_t *);
+
+static const char * lmtemp_compats[] = {
+ "i2c-lm75",
+ /*
+ * see XXX in _attach() below: add code once non-lm75 matches are
+ * added here!
+ */
+ NULL
+};
+
enum {
lmtemp_lm75 = 0,
lmtemp_ds75,
@@ -100,15 +110,28 @@ lmtemp_match(device_t parent, cfdata_t c
struct i2c_attach_args *ia = aux;
int i;
- for (i = 0; lmtemptbl[i].lmtemp_type != -1 ; i++)
- if (lmtemptbl[i].lmtemp_type == cf->cf_flags)
- break;
- if (lmtemptbl[i].lmtemp_type == -1)
- return 0;
-
- if ((ia->ia_addr & lmtemptbl[i].lmtemp_addrmask) ==
- lmtemptbl[i].lmtemp_addr)
- return 1;
+ if (ia->ia_name == NULL) {
+ /*
+ * Indirect config - not much we can do!
+ */
+ for (i = 0; lmtemptbl[i].lmtemp_type != -1 ; i++)
+ if (lmtemptbl[i].lmtemp_type == cf->cf_flags)
+ break;
+ if (lmtemptbl[i].lmtemp_type == -1)
+ return 0;
+
+ if ((ia->ia_addr & lmtemptbl[i].lmtemp_addrmask) ==
+ lmtemptbl[i].lmtemp_addr)
+ return 1;
+ } else {
+ /*
+ * Direct config - match via the list of compatible
+ * hardware.
+ */
+ if (iic_compat_match(ia, lmtemp_compats))
+ return 1;
+ }
+
return 0;
}
@@ -120,16 +143,27 @@ lmtemp_attach(device_t parent, device_t
struct i2c_attach_args *ia = aux;
int i;
- for (i = 0; lmtemptbl[i].lmtemp_type != -1 ; i++)
- if (lmtemptbl[i].lmtemp_type ==
- device_cfdata(self)->cf_flags)
- break;
+ if (ia->ia_name == NULL) {
+ for (i = 0; lmtemptbl[i].lmtemp_type != -1 ; i++)
+ if (lmtemptbl[i].lmtemp_type ==
+ device_cfdata(self)->cf_flags)
+ break;
+ } else {
+ /* XXX - add code when adding other direct matches! */
+ i = 0;
+ }
sc->sc_tag = ia->ia_tag;
sc->sc_address = ia->ia_addr;
aprint_naive(": Temperature Sensor\n");
- aprint_normal(": %s Temperature Sensor\n", lmtemptbl[i].lmtemp_name);
+ if (ia->ia_name) {
+ aprint_normal(": %s %s Temperature Sensor\n", ia->ia_name,
+ lmtemptbl[i].lmtemp_name);
+ } else {
+ aprint_normal(": %s Temperature Sensor\n",
+ lmtemptbl[i].lmtemp_name);
+ }
/* Set the configuration of the LM75 to defaults. */
iic_acquire_bus(sc->sc_tag, I2C_F_POLL);
@@ -143,7 +177,8 @@ lmtemp_attach(device_t parent, device_t
sc->sc_sme = sysmon_envsys_create();
/* Initialize sensor data. */
sc->sc_sensor.units = ENVSYS_STEMP;
- (void)strlcpy(sc->sc_sensor.desc, device_xname(self),
+ (void)strlcpy(sc->sc_sensor.desc,
+ ia->ia_name? ia->ia_name : device_xname(self),
sizeof(sc->sc_sensor.desc));
if (sysmon_envsys_sensor_attach(sc->sc_sme, &sc->sc_sensor)) {
sysmon_envsys_destroy(sc->sc_sme);
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