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authorBen Dooks <ben-linux@fluff.org>2008-07-25 04:46:01 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-25 13:53:30 -0400
commit42cd2366fb9b58cdfc1855be32b31a78e40b2079 (patch)
tree58f335a86f7c2f127509642499d1fd2a27d21ff9 /drivers/mfd
parent60e540d617b40eb3d37f1dd99c97af588ff9b70b (diff)
sm501: gpio I2C support
Add support for adding the GPIO based I2C resources. Signed-off-by: Ben Dooks <ben-linux@fluff.org> Cc: Arnaud Patard <apatard@mandriva.com> Cc: David Brownell <david-b@pacbell.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/mfd')
-rw-r--r--drivers/mfd/sm501.c76
1 files changed, 75 insertions, 1 deletions
diff --git a/drivers/mfd/sm501.c b/drivers/mfd/sm501.c
index c3e5a48f6148..107215b28805 100644
--- a/drivers/mfd/sm501.c
+++ b/drivers/mfd/sm501.c
@@ -20,6 +20,7 @@
20#include <linux/platform_device.h> 20#include <linux/platform_device.h>
21#include <linux/pci.h> 21#include <linux/pci.h>
22#include <linux/gpio.h> 22#include <linux/gpio.h>
23#include <linux/i2c-gpio.h>
23 24
24#include <linux/sm501.h> 25#include <linux/sm501.h>
25#include <linux/sm501-regs.h> 26#include <linux/sm501-regs.h>
@@ -1086,6 +1087,11 @@ static void sm501_gpio_remove(struct sm501_devdata *sm)
1086 dev_err(sm->dev, "cannot remove high chip, cannot tidy up\n"); 1087 dev_err(sm->dev, "cannot remove high chip, cannot tidy up\n");
1087} 1088}
1088 1089
1090static int sm501_gpio_pin2nr(struct sm501_devdata *sm, unsigned int pin)
1091{
1092 struct sm501_gpio *gpio = &sm->gpio;
1093 return pin + (pin < 32) ? gpio->low.gpio.base : gpio->high.gpio.base;
1094}
1089#else 1095#else
1090static int sm501_register_gpio(struct sm501_devdata *sm) 1096static int sm501_register_gpio(struct sm501_devdata *sm)
1091{ 1097{
@@ -1095,8 +1101,66 @@ static int sm501_register_gpio(struct sm501_devdata *sm)
1095static void sm501_gpio_remove(struct sm501_devdata *sm) 1101static void sm501_gpio_remove(struct sm501_devdata *sm)
1096{ 1102{
1097} 1103}
1104
1105static int sm501_gpio_pin2nr(struct sm501_devdata *sm, unsigned int pin)
1106{
1107 return -1;
1108}
1098#endif 1109#endif
1099 1110
1111static int sm501_register_gpio_i2c_instance(struct sm501_devdata *sm,
1112 struct sm501_platdata_gpio_i2c *iic)
1113{
1114 struct i2c_gpio_platform_data *icd;
1115 struct platform_device *pdev;
1116
1117 pdev = sm501_create_subdev(sm, "i2c-gpio", 0,
1118 sizeof(struct i2c_gpio_platform_data));
1119 if (!pdev)
1120 return -ENOMEM;
1121
1122 icd = pdev->dev.platform_data;
1123
1124 /* We keep the pin_sda and pin_scl fields relative in case the
1125 * same platform data is passed to >1 SM501.
1126 */
1127
1128 icd->sda_pin = sm501_gpio_pin2nr(sm, iic->pin_sda);
1129 icd->scl_pin = sm501_gpio_pin2nr(sm, iic->pin_scl);
1130 icd->timeout = iic->timeout;
1131 icd->udelay = iic->udelay;
1132
1133 /* note, we can't use either of the pin numbers, as the i2c-gpio
1134 * driver uses the platform.id field to generate the bus number
1135 * to register with the i2c core; The i2c core doesn't have enough
1136 * entries to deal with anything we currently use.
1137 */
1138
1139 pdev->id = iic->bus_num;
1140
1141 dev_info(sm->dev, "registering i2c-%d: sda=%d (%d), scl=%d (%d)\n",
1142 iic->bus_num,
1143 icd->sda_pin, iic->pin_sda, icd->scl_pin, iic->pin_scl);
1144
1145 return sm501_register_device(sm, pdev);
1146}
1147
1148static int sm501_register_gpio_i2c(struct sm501_devdata *sm,
1149 struct sm501_platdata *pdata)
1150{
1151 struct sm501_platdata_gpio_i2c *iic = pdata->gpio_i2c;
1152 int index;
1153 int ret;
1154
1155 for (index = 0; index < pdata->gpio_i2c_nr; index++, iic++) {
1156 ret = sm501_register_gpio_i2c_instance(sm, iic);
1157 if (ret < 0)
1158 return ret;
1159 }
1160
1161 return 0;
1162}
1163
1100/* sm501_dbg_regs 1164/* sm501_dbg_regs
1101 * 1165 *
1102 * Debug attribute to attach to parent device to show core registers 1166 * Debug attribute to attach to parent device to show core registers
@@ -1204,6 +1268,7 @@ static unsigned int sm501_mem_local[] = {
1204static int sm501_init_dev(struct sm501_devdata *sm) 1268static int sm501_init_dev(struct sm501_devdata *sm)
1205{ 1269{
1206 struct sm501_initdata *idata; 1270 struct sm501_initdata *idata;
1271 struct sm501_platdata *pdata;
1207 resource_size_t mem_avail; 1272 resource_size_t mem_avail;
1208 unsigned long dramctrl; 1273 unsigned long dramctrl;
1209 unsigned long devid; 1274 unsigned long devid;
@@ -1242,7 +1307,9 @@ static int sm501_init_dev(struct sm501_devdata *sm)
1242 1307
1243 /* check to see if we have some device initialisation */ 1308 /* check to see if we have some device initialisation */
1244 1309
1245 idata = sm->platdata ? sm->platdata->init : NULL; 1310 pdata = sm->platdata;
1311 idata = pdata ? pdata->init : NULL;
1312
1246 if (idata) { 1313 if (idata) {
1247 sm501_init_regs(sm, idata); 1314 sm501_init_regs(sm, idata);
1248 1315
@@ -1254,6 +1321,13 @@ static int sm501_init_dev(struct sm501_devdata *sm)
1254 sm501_register_gpio(sm); 1321 sm501_register_gpio(sm);
1255 } 1322 }
1256 1323
1324 if (pdata->gpio_i2c != NULL && pdata->gpio_i2c_nr > 0) {
1325 if (!sm->gpio.registered)
1326 dev_err(sm->dev, "no gpio registered for i2c gpio.\n");
1327 else
1328 sm501_register_gpio_i2c(sm, pdata);
1329 }
1330
1257 ret = sm501_check_clocks(sm); 1331 ret = sm501_check_clocks(sm);
1258 if (ret) { 1332 if (ret) {
1259 dev_err(sm->dev, "M1X and M clocks sourced from different " 1333 dev_err(sm->dev, "M1X and M clocks sourced from different "