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path: root/drivers/regulator/twl-regulator.c
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Diffstat (limited to 'drivers/regulator/twl-regulator.c')
-rw-r--r--drivers/regulator/twl-regulator.c630
1 files changed, 630 insertions, 0 deletions
diff --git a/drivers/regulator/twl-regulator.c b/drivers/regulator/twl-regulator.c
new file mode 100644
index 000000000000..7e674859bd59
--- /dev/null
+++ b/drivers/regulator/twl-regulator.c
@@ -0,0 +1,630 @@
+/*
+ * twl-regulator.c -- support regulators in twl4030/twl6030 family chips
+ *
+ * Copyright (C) 2008 David Brownell
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/i2c/twl.h>
+
+
+/*
+ * The TWL4030/TW5030/TPS659x0/TWL6030 family chips include power management, a
+ * USB OTG transceiver, an RTC, ADC, PWM, and lots more. Some versions
+ * include an audio codec, battery charger, and more voltage regulators.
+ * These chips are often used in OMAP-based systems.
+ *
+ * This driver implements software-based resource control for various
+ * voltage regulators. This is usually augmented with state machine
+ * based control.
+ */
+
+struct twlreg_info {
+ /* start of regulator's PM_RECEIVER control register bank */
+ u8 base;
+
+ /* twl resource ID, for resource control state machine */
+ u8 id;
+
+ /* voltage in mV = table[VSEL]; table_len must be a power-of-two */
+ u8 table_len;
+ const u16 *table;
+
+ /* regulator specific turn-on delay */
+ u16 delay;
+
+ /* State REMAP default configuration */
+ u8 remap;
+
+ /* chip constraints on regulator behavior */
+ u16 min_mV;
+
+ /* used by regulator core */
+ struct regulator_desc desc;
+};
+
+
+/* LDO control registers ... offset is from the base of its register bank.
+ * The first three registers of all power resource banks help hardware to
+ * manage the various resource groups.
+ */
+/* Common offset in TWL4030/6030 */
+#define VREG_GRP 0
+/* TWL4030 register offsets */
+#define VREG_TYPE 1
+#define VREG_REMAP 2
+#define VREG_DEDICATED 3 /* LDO control */
+/* TWL6030 register offsets */
+#define VREG_TRANS 1
+#define VREG_STATE 2
+#define VREG_VOLTAGE 3
+/* TWL6030 Misc register offsets */
+#define VREG_BC_ALL 1
+#define VREG_BC_REF 2
+#define VREG_BC_PROC 3
+#define VREG_BC_CLK_RST 4
+
+static inline int
+twlreg_read(struct twlreg_info *info, unsigned slave_subgp, unsigned offset)
+{
+ u8 value;
+ int status;
+
+ status = twl_i2c_read_u8(slave_subgp,
+ &value, info->base + offset);
+ return (status < 0) ? status : value;
+}
+
+static inline int
+twlreg_write(struct twlreg_info *info, unsigned slave_subgp, unsigned offset,
+ u8 value)
+{
+ return twl_i2c_write_u8(slave_subgp,
+ value, info->base + offset);
+}
+
+/*----------------------------------------------------------------------*/
+
+/* generic power resource operations, which work on all regulators */
+
+static int twlreg_grp(struct regulator_dev *rdev)
+{
+ return twlreg_read(rdev_get_drvdata(rdev), TWL_MODULE_PM_RECEIVER,
+ VREG_GRP);
+}
+
+/*
+ * Enable/disable regulators by joining/leaving the P1 (processor) group.
+ * We assume nobody else is updating the DEV_GRP registers.
+ */
+/* definition for 4030 family */
+#define P3_GRP_4030 BIT(7) /* "peripherals" */
+#define P2_GRP_4030 BIT(6) /* secondary processor, modem, etc */
+#define P1_GRP_4030 BIT(5) /* CPU/Linux */
+/* definition for 6030 family */
+#define P3_GRP_6030 BIT(2) /* secondary processor, modem, etc */
+#define P2_GRP_6030 BIT(1) /* "peripherals" */
+#define P1_GRP_6030 BIT(0) /* CPU/Linux */
+
+static int twlreg_is_enabled(struct regulator_dev *rdev)
+{
+ int state = twlreg_grp(rdev);
+
+ if (state < 0)
+ return state;
+
+ if (twl_class_is_4030())
+ state &= P1_GRP_4030;
+ else
+ state &= P1_GRP_6030;
+ return state;
+}
+
+static int twlreg_enable(struct regulator_dev *rdev)
+{
+ struct twlreg_info *info = rdev_get_drvdata(rdev);
+ int grp;
+ int ret;
+
+ grp = twlreg_read(info, TWL_MODULE_PM_RECEIVER, VREG_GRP);
+ if (grp < 0)
+ return grp;
+
+ if (twl_class_is_4030())
+ grp |= P1_GRP_4030;
+ else
+ grp |= P1_GRP_6030;
+
+ ret = twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_GRP, grp);
+
+ udelay(info->delay);
+
+ return ret;
+}
+
+static int twlreg_disable(struct regulator_dev *rdev)
+{
+ struct twlreg_info *info = rdev_get_drvdata(rdev);
+ int grp;
+
+ grp = twlreg_read(info, TWL_MODULE_PM_RECEIVER, VREG_GRP);
+ if (grp < 0)
+ return grp;
+
+ if (twl_class_is_4030())
+ grp &= ~(P1_GRP_4030 | P2_GRP_4030 | P3_GRP_4030);
+ else
+ grp &= ~(P1_GRP_6030 | P2_GRP_6030 | P3_GRP_6030);
+
+ return twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_GRP, grp);
+}
+
+static int twlreg_get_status(struct regulator_dev *rdev)
+{
+ int state = twlreg_grp(rdev);
+
+ if (twl_class_is_6030())
+ return 0; /* FIXME return for 6030 regulator */
+
+ if (state < 0)
+ return state;
+ state &= 0x0f;
+
+ /* assume state != WARM_RESET; we'd not be running... */
+ if (!state)
+ return REGULATOR_STATUS_OFF;
+ return (state & BIT(3))
+ ? REGULATOR_STATUS_NORMAL
+ : REGULATOR_STATUS_STANDBY;
+}
+
+static int twlreg_set_mode(struct regulator_dev *rdev, unsigned mode)
+{
+ struct twlreg_info *info = rdev_get_drvdata(rdev);
+ unsigned message;
+ int status;
+
+ if (twl_class_is_6030())
+ return 0; /* FIXME return for 6030 regulator */
+
+ /* We can only set the mode through state machine commands... */
+ switch (mode) {
+ case REGULATOR_MODE_NORMAL:
+ message = MSG_SINGULAR(DEV_GRP_P1, info->id, RES_STATE_ACTIVE);
+ break;
+ case REGULATOR_MODE_STANDBY:
+ message = MSG_SINGULAR(DEV_GRP_P1, info->id, RES_STATE_SLEEP);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ /* Ensure the resource is associated with some group */
+ status = twlreg_grp(rdev);
+ if (status < 0)
+ return status;
+ if (!(status & (P3_GRP_4030 | P2_GRP_4030 | P1_GRP_4030)))
+ return -EACCES;
+
+ status = twl_i2c_write_u8(TWL_MODULE_PM_MASTER,
+ message >> 8, 0x15 /* PB_WORD_MSB */ );
+ if (status >= 0)
+ return status;
+
+ return twl_i2c_write_u8(TWL_MODULE_PM_MASTER,
+ message, 0x16 /* PB_WORD_LSB */ );
+}
+
+/*----------------------------------------------------------------------*/
+
+/*
+ * Support for adjustable-voltage LDOs uses a four bit (or less) voltage
+ * select field in its control register. We use tables indexed by VSEL
+ * to record voltages in milliVolts. (Accuracy is about three percent.)
+ *
+ * Note that VSEL values for VAUX2 changed in twl5030 and newer silicon;
+ * currently handled by listing two slightly different VAUX2 regulators,
+ * only one of which will be configured.
+ *
+ * VSEL values documented as "TI cannot support these values" are flagged
+ * in these tables as UNSUP() values; we normally won't assign them.
+ *
+ * VAUX3 at 3V is incorrectly listed in some TI manuals as unsupported.
+ * TI are revising the twl5030/tps659x0 specs to support that 3.0V setting.
+ */
+#ifdef CONFIG_TWL4030_ALLOW_UNSUPPORTED
+#define UNSUP_MASK 0x0000
+#else
+#define UNSUP_MASK 0x8000
+#endif
+
+#define UNSUP(x) (UNSUP_MASK | (x))
+#define IS_UNSUP(x) (UNSUP_MASK & (x))
+#define LDO_MV(x) (~UNSUP_MASK & (x))
+
+
+static const u16 VAUX1_VSEL_table[] = {
+ UNSUP(1500), UNSUP(1800), 2500, 2800,
+ 3000, 3000, 3000, 3000,
+};
+static const u16 VAUX2_4030_VSEL_table[] = {
+ UNSUP(1000), UNSUP(1000), UNSUP(1200), 1300,
+ 1500, 1800, UNSUP(1850), 2500,
+ UNSUP(2600), 2800, UNSUP(2850), UNSUP(3000),
+ UNSUP(3150), UNSUP(3150), UNSUP(3150), UNSUP(3150),
+};
+static const u16 VAUX2_VSEL_table[] = {
+ 1700, 1700, 1900, 1300,
+ 1500, 1800, 2000, 2500,
+ 2100, 2800, 2200, 2300,
+ 2400, 2400, 2400, 2400,
+};
+static const u16 VAUX3_VSEL_table[] = {
+ 1500, 1800, 2500, 2800,
+ 3000, 3000, 3000, 3000,
+};
+static const u16 VAUX4_VSEL_table[] = {
+ 700, 1000, 1200, UNSUP(1300),
+ 1500, 1800, UNSUP(1850), 2500,
+ UNSUP(2600), 2800, UNSUP(2850), UNSUP(3000),
+ UNSUP(3150), UNSUP(3150), UNSUP(3150), UNSUP(3150),
+};
+static const u16 VMMC1_VSEL_table[] = {
+ 1850, 2850, 3000, 3150,
+};
+static const u16 VMMC2_VSEL_table[] = {
+ UNSUP(1000), UNSUP(1000), UNSUP(1200), UNSUP(1300),
+ UNSUP(1500), UNSUP(1800), 1850, UNSUP(2500),
+ 2600, 2800, 2850, 3000,
+ 3150, 3150, 3150, 3150,
+};
+static const u16 VPLL1_VSEL_table[] = {
+ 1000, 1200, 1300, 1800,
+ UNSUP(2800), UNSUP(3000), UNSUP(3000), UNSUP(3000),
+};
+static const u16 VPLL2_VSEL_table[] = {
+ 700, 1000, 1200, 1300,
+ UNSUP(1500), 1800, UNSUP(1850), UNSUP(2500),
+ UNSUP(2600), UNSUP(2800), UNSUP(2850), UNSUP(3000),
+ UNSUP(3150), UNSUP(3150), UNSUP(3150), UNSUP(3150),
+};
+static const u16 VSIM_VSEL_table[] = {
+ UNSUP(1000), UNSUP(1200), UNSUP(1300), 1800,
+ 2800, 3000, 3000, 3000,
+};
+static const u16 VDAC_VSEL_table[] = {
+ 1200, 1300, 1800, 1800,
+};
+static const u16 VDD1_VSEL_table[] = {
+ 800, 1450,
+};
+static const u16 VDD2_VSEL_table[] = {
+ 800, 1450, 1500,
+};
+static const u16 VIO_VSEL_table[] = {
+ 1800, 1850,
+};
+static const u16 VINTANA2_VSEL_table[] = {
+ 2500, 2750,
+};
+static const u16 VAUX1_6030_VSEL_table[] = {
+ 1000, 1300, 1800, 2500,
+ 2800, 2900, 3000, 3000,
+};
+static const u16 VAUX2_6030_VSEL_table[] = {
+ 1200, 1800, 2500, 2750,
+ 2800, 2800, 2800, 2800,
+};
+static const u16 VAUX3_6030_VSEL_table[] = {
+ 1000, 1200, 1300, 1800,
+ 2500, 2800, 3000, 3000,
+};
+static const u16 VMMC_VSEL_table[] = {
+ 1200, 1800, 2800, 2900,
+ 3000, 3000, 3000, 3000,
+};
+static const u16 VPP_VSEL_table[] = {
+ 1800, 1900, 2000, 2100,
+ 2200, 2300, 2400, 2500,
+};
+static const u16 VUSIM_VSEL_table[] = {
+ 1200, 1800, 2500, 2900,
+};
+
+static int twlldo_list_voltage(struct regulator_dev *rdev, unsigned index)
+{
+ struct twlreg_info *info = rdev_get_drvdata(rdev);
+ int mV = info->table[index];
+
+ return IS_UNSUP(mV) ? 0 : (LDO_MV(mV) * 1000);
+}
+
+static int
+twlldo_set_voltage(struct regulator_dev *rdev, int min_uV, int max_uV)
+{
+ struct twlreg_info *info = rdev_get_drvdata(rdev);
+ int vsel;
+
+ for (vsel = 0; vsel < info->table_len; vsel++) {
+ int mV = info->table[vsel];
+ int uV;
+
+ if (IS_UNSUP(mV))
+ continue;
+ uV = LDO_MV(mV) * 1000;
+
+ /* REVISIT for VAUX2, first match may not be best/lowest */
+
+ /* use the first in-range value */
+ if (min_uV <= uV && uV <= max_uV)
+ return twlreg_write(info, TWL_MODULE_PM_RECEIVER,
+ VREG_VOLTAGE, vsel);
+ }
+
+ return -EDOM;
+}
+
+static int twlldo_get_voltage(struct regulator_dev *rdev)
+{
+ struct twlreg_info *info = rdev_get_drvdata(rdev);
+ int vsel = twlreg_read(info, TWL_MODULE_PM_RECEIVER,
+ VREG_VOLTAGE);
+
+ if (vsel < 0)
+ return vsel;
+
+ vsel &= info->table_len - 1;
+ return LDO_MV(info->table[vsel]) * 1000;
+}
+
+static struct regulator_ops twlldo_ops = {
+ .list_voltage = twlldo_list_voltage,
+
+ .set_voltage = twlldo_set_voltage,
+ .get_voltage = twlldo_get_voltage,
+
+ .enable = twlreg_enable,
+ .disable = twlreg_disable,
+ .is_enabled = twlreg_is_enabled,
+
+ .set_mode = twlreg_set_mode,
+
+ .get_status = twlreg_get_status,
+};
+
+/*----------------------------------------------------------------------*/
+
+/*
+ * Fixed voltage LDOs don't have a VSEL field to update.
+ */
+static int twlfixed_list_voltage(struct regulator_dev *rdev, unsigned index)
+{
+ struct twlreg_info *info = rdev_get_drvdata(rdev);
+
+ return info->min_mV * 1000;
+}
+
+static int twlfixed_get_voltage(struct regulator_dev *rdev)
+{
+ struct twlreg_info *info = rdev_get_drvdata(rdev);
+
+ return info->min_mV * 1000;
+}
+
+static struct regulator_ops twlfixed_ops = {
+ .list_voltage = twlfixed_list_voltage,
+
+ .get_voltage = twlfixed_get_voltage,
+
+ .enable = twlreg_enable,
+ .disable = twlreg_disable,
+ .is_enabled = twlreg_is_enabled,
+
+ .set_mode = twlreg_set_mode,
+
+ .get_status = twlreg_get_status,
+};
+
+/*----------------------------------------------------------------------*/
+
+#define TWL4030_ADJUSTABLE_LDO(label, offset, num, turnon_delay, remap_conf) \
+ TWL_ADJUSTABLE_LDO(label, offset, num, turnon_delay, \
+ remap_conf, TWL4030)
+#define TWL4030_FIXED_LDO(label, offset, mVolts, num, turnon_delay, \
+ remap_conf) \
+ TWL_FIXED_LDO(label, offset, mVolts, num, turnon_delay, \
+ remap_conf, TWL4030)
+#define TWL6030_ADJUSTABLE_LDO(label, offset, num, turnon_delay, \
+ remap_conf) \
+ TWL_ADJUSTABLE_LDO(label, offset, num, turnon_delay, \
+ remap_conf, TWL6030)
+#define TWL6030_FIXED_LDO(label, offset, mVolts, num, turnon_delay, \
+ remap_conf) \
+ TWL_FIXED_LDO(label, offset, mVolts, num, turnon_delay, \
+ remap_conf, TWL6030)
+
+#define TWL_ADJUSTABLE_LDO(label, offset, num, turnon_delay, remap_conf, \
+ family) { \
+ .base = offset, \
+ .id = num, \
+ .table_len = ARRAY_SIZE(label##_VSEL_table), \
+ .table = label##_VSEL_table, \
+ .delay = turnon_delay, \
+ .remap = remap_conf, \
+ .desc = { \
+ .name = #label, \
+ .id = family##_REG_##label, \
+ .n_voltages = ARRAY_SIZE(label##_VSEL_table), \
+ .ops = &twlldo_ops, \
+ .type = REGULATOR_VOLTAGE, \
+ .owner = THIS_MODULE, \
+ }, \
+ }
+
+#define TWL_FIXED_LDO(label, offset, mVolts, num, turnon_delay, remap_conf, \
+ family) { \
+ .base = offset, \
+ .id = num, \
+ .min_mV = mVolts, \
+ .delay = turnon_delay, \
+ .remap = remap_conf, \
+ .desc = { \
+ .name = #label, \
+ .id = family##_REG_##label, \
+ .n_voltages = 1, \
+ .ops = &twlfixed_ops, \
+ .type = REGULATOR_VOLTAGE, \
+ .owner = THIS_MODULE, \
+ }, \
+ }
+
+/*
+ * We list regulators here if systems need some level of
+ * software control over them after boot.
+ */
+static struct twlreg_info twl_regs[] = {
+ TWL4030_ADJUSTABLE_LDO(VAUX1, 0x17, 1, 100, 0x08),
+ TWL4030_ADJUSTABLE_LDO(VAUX2_4030, 0x1b, 2, 100, 0x08),
+ TWL4030_ADJUSTABLE_LDO(VAUX2, 0x1b, 2, 100, 0x08),
+ TWL4030_ADJUSTABLE_LDO(VAUX3, 0x1f, 3, 100, 0x08),
+ TWL4030_ADJUSTABLE_LDO(VAUX4, 0x23, 4, 100, 0x08),
+ TWL4030_ADJUSTABLE_LDO(VMMC1, 0x27, 5, 100, 0x08),
+ TWL4030_ADJUSTABLE_LDO(VMMC2, 0x2b, 6, 100, 0x08),
+ TWL4030_ADJUSTABLE_LDO(VPLL1, 0x2f, 7, 100, 0x00),
+ TWL4030_ADJUSTABLE_LDO(VPLL2, 0x33, 8, 100, 0x08),
+ TWL4030_ADJUSTABLE_LDO(VSIM, 0x37, 9, 100, 0x00),
+ TWL4030_ADJUSTABLE_LDO(VDAC, 0x3b, 10, 100, 0x08),
+ TWL4030_FIXED_LDO(VINTANA1, 0x3f, 1500, 11, 100, 0x08),
+ TWL4030_ADJUSTABLE_LDO(VINTANA2, 0x43, 12, 100, 0x08),
+ TWL4030_FIXED_LDO(VINTDIG, 0x47, 1500, 13, 100, 0x08),
+ TWL4030_ADJUSTABLE_LDO(VIO, 0x4b, 14, 1000, 0x08),
+ TWL4030_ADJUSTABLE_LDO(VDD1, 0x55, 15, 1000, 0x08),
+ TWL4030_ADJUSTABLE_LDO(VDD2, 0x63, 16, 1000, 0x08),
+ TWL4030_FIXED_LDO(VUSB1V5, 0x71, 1500, 17, 100, 0x08),
+ TWL4030_FIXED_LDO(VUSB1V8, 0x74, 1800, 18, 100, 0x08),
+ TWL4030_FIXED_LDO(VUSB3V1, 0x77, 3100, 19, 150, 0x08),
+ /* VUSBCP is managed *only* by the USB subchip */
+
+ /* 6030 REG with base as PMC Slave Misc : 0x0030 */
+ /* Turnon-delay and remap configuration values for 6030 are not
+ verified since the specification is not public */
+ TWL6030_ADJUSTABLE_LDO(VAUX1_6030, 0x54, 1, 0, 0x08),
+ TWL6030_ADJUSTABLE_LDO(VAUX2_6030, 0x58, 2, 0, 0x08),
+ TWL6030_ADJUSTABLE_LDO(VAUX3_6030, 0x5c, 3, 0, 0x08),
+ TWL6030_ADJUSTABLE_LDO(VMMC, 0x68, 4, 0, 0x08),
+ TWL6030_ADJUSTABLE_LDO(VPP, 0x6c, 5, 0, 0x08),
+ TWL6030_ADJUSTABLE_LDO(VUSIM, 0x74, 7, 0, 0x08),
+ TWL6030_FIXED_LDO(VANA, 0x50, 2100, 15, 0, 0x08),
+ TWL6030_FIXED_LDO(VCXIO, 0x60, 1800, 16, 0, 0x08),
+ TWL6030_FIXED_LDO(VDAC, 0x64, 1800, 17, 0, 0x08),
+ TWL6030_FIXED_LDO(VUSB, 0x70, 3300, 18, 0, 0x08)
+};
+
+static int twlreg_probe(struct platform_device *pdev)
+{
+ int i;
+ struct twlreg_info *info;
+ struct regulator_init_data *initdata;
+ struct regulation_constraints *c;
+ struct regulator_dev *rdev;
+
+ for (i = 0, info = NULL; i < ARRAY_SIZE(twl_regs); i++) {
+ if (twl_regs[i].desc.id != pdev->id)
+ continue;
+ info = twl_regs + i;
+ break;
+ }
+ if (!info)
+ return -ENODEV;
+
+ initdata = pdev->dev.platform_data;
+ if (!initdata)
+ return -EINVAL;
+
+ /* Constrain board-specific capabilities according to what
+ * this driver and the chip itself can actually do.
+ */
+ c = &initdata->constraints;
+ c->valid_modes_mask &= REGULATOR_MODE_NORMAL | REGULATOR_MODE_STANDBY;
+ c->valid_ops_mask &= REGULATOR_CHANGE_VOLTAGE
+ | REGULATOR_CHANGE_MODE
+ | REGULATOR_CHANGE_STATUS;
+ switch (pdev->id) {
+ case TWL4030_REG_VIO:
+ case TWL4030_REG_VDD1:
+ case TWL4030_REG_VDD2:
+ case TWL4030_REG_VPLL1:
+ case TWL4030_REG_VINTANA1:
+ case TWL4030_REG_VINTANA2:
+ case TWL4030_REG_VINTDIG:
+ c->always_on = true;
+ break;
+ default:
+ break;
+ }
+
+ rdev = regulator_register(&info->desc, &pdev->dev, initdata, info);
+ if (IS_ERR(rdev)) {
+ dev_err(&pdev->dev, "can't register %s, %ld\n",
+ info->desc.name, PTR_ERR(rdev));
+ return PTR_ERR(rdev);
+ }
+ platform_set_drvdata(pdev, rdev);
+
+ twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_REMAP,
+ info->remap);
+
+ /* NOTE: many regulators support short-circuit IRQs (presentable
+ * as REGULATOR_OVER_CURRENT notifications?) configured via:
+ * - SC_CONFIG
+ * - SC_DETECT1 (vintana2, vmmc1/2, vaux1/2/3/4)
+ * - SC_DETECT2 (vusb, vdac, vio, vdd1/2, vpll2)
+ * - IT_CONFIG
+ */
+
+ return 0;
+}
+
+static int __devexit twlreg_remove(struct platform_device *pdev)
+{
+ regulator_unregister(platform_get_drvdata(pdev));
+ return 0;
+}
+
+MODULE_ALIAS("platform:twl_reg");
+
+static struct platform_driver twlreg_driver = {
+ .probe = twlreg_probe,
+ .remove = __devexit_p(twlreg_remove),
+ /* NOTE: short name, to work around driver model truncation of
+ * "twl_regulator.12" (and friends) to "twl_regulator.1".
+ */
+ .driver.name = "twl_reg",
+ .driver.owner = THIS_MODULE,
+};
+
+static int __init twlreg_init(void)
+{
+ return platform_driver_register(&twlreg_driver);
+}
+subsys_initcall(twlreg_init);
+
+static void __exit twlreg_exit(void)
+{
+ platform_driver_unregister(&twlreg_driver);
+}
+module_exit(twlreg_exit)
+
+MODULE_DESCRIPTION("TWL regulator driver");
+MODULE_LICENSE("GPL");