aboutsummaryrefslogtreecommitdiff
path: root/drivers/input/touchscreen/wm9713.c
diff options
context:
space:
mode:
authorLibravatar Linus Torvalds <torvalds@linux-foundation.org>2023-02-21 18:24:12 -0800
committerLibravatar Linus Torvalds <torvalds@linux-foundation.org>2023-02-21 18:24:12 -0800
commit5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 (patch)
treecc5c2d0a898769fd59549594fedb3ee6f84e59a0 /drivers/input/touchscreen/wm9713.c
downloadlinux-5b7c4cabbb65f5c469464da6c5f614cbd7f730f2.tar.gz
linux-5b7c4cabbb65f5c469464da6c5f614cbd7f730f2.zip
Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-nextgrafted
Pull networking updates from Jakub Kicinski: "Core: - Add dedicated kmem_cache for typical/small skb->head, avoid having to access struct page at kfree time, and improve memory use. - Introduce sysctl to set default RPS configuration for new netdevs. - Define Netlink protocol specification format which can be used to describe messages used by each family and auto-generate parsers. Add tools for generating kernel data structures and uAPI headers. - Expose all net/core sysctls inside netns. - Remove 4s sleep in netpoll if carrier is instantly detected on boot. - Add configurable limit of MDB entries per port, and port-vlan. - Continue populating drop reasons throughout the stack. - Retire a handful of legacy Qdiscs and classifiers. Protocols: - Support IPv4 big TCP (TSO frames larger than 64kB). - Add IP_LOCAL_PORT_RANGE socket option, to control local port range on socket by socket basis. - Track and report in procfs number of MPTCP sockets used. - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path manager. - IPv6: don't check net.ipv6.route.max_size and rely on garbage collection to free memory (similarly to IPv4). - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986). - ICMP: add per-rate limit counters. - Add support for user scanning requests in ieee802154. - Remove static WEP support. - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate reporting. - WiFi 7 EHT channel puncturing support (client & AP). BPF: - Add a rbtree data structure following the "next-gen data structure" precedent set by recently added linked list, that is, by using kfunc + kptr instead of adding a new BPF map type. - Expose XDP hints via kfuncs with initial support for RX hash and timestamp metadata. - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to better support decap on GRE tunnel devices not operating in collect metadata. - Improve x86 JIT's codegen for PROBE_MEM runtime error checks. - Remove the need for trace_printk_lock for bpf_trace_printk and bpf_trace_vprintk helpers. - Extend libbpf's bpf_tracing.h support for tracing arguments of kprobes/uprobes and syscall as a special case. - Significantly reduce the search time for module symbols by livepatch and BPF. - Enable cpumasks to be used as kptrs, which is useful for tracing programs tracking which tasks end up running on which CPUs in different time intervals. - Add support for BPF trampoline on s390x and riscv64. - Add capability to export the XDP features supported by the NIC. - Add __bpf_kfunc tag for marking kernel functions as kfuncs. - Add cgroup.memory=nobpf kernel parameter option to disable BPF memory accounting for container environments. Netfilter: - Remove the CLUSTERIP target. It has been marked as obsolete for years, and we still have WARN splats wrt races of the out-of-band /proc interface installed by this target. - Add 'destroy' commands to nf_tables. They are identical to the existing 'delete' commands, but do not return an error if the referenced object (set, chain, rule...) did not exist. Driver API: - Improve cpumask_local_spread() locality to help NICs set the right IRQ affinity on AMD platforms. - Separate C22 and C45 MDIO bus transactions more clearly. - Introduce new DCB table to control DSCP rewrite on egress. - Support configuration of Physical Layer Collision Avoidance (PLCA) Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of shared medium Ethernet. - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing preemption of low priority frames by high priority frames. - Add support for controlling MACSec offload using netlink SET. - Rework devlink instance refcounts to allow registration and de-registration under the instance lock. Split the code into multiple files, drop some of the unnecessarily granular locks and factor out common parts of netlink operation handling. - Add TX frame aggregation parameters (for USB drivers). - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning messages with notifications for debug. - Allow offloading of UDP NEW connections via act_ct. - Add support for per action HW stats in TC. - Support hardware miss to TC action (continue processing in SW from a specific point in the action chain). - Warn if old Wireless Extension user space interface is used with modern cfg80211/mac80211 drivers. Do not support Wireless Extensions for Wi-Fi 7 devices at all. Everyone should switch to using nl80211 interface instead. - Improve the CAN bit timing configuration. Use extack to return error messages directly to user space, update the SJW handling, including the definition of a new default value that will benefit CAN-FD controllers, by increasing their oscillator tolerance. New hardware / drivers: - Ethernet: - nVidia BlueField-3 support (control traffic driver) - Ethernet support for imx93 SoCs - Motorcomm yt8531 gigabit Ethernet PHY - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA) - Microchip LAN8841 PHY (incl. cable diagnostics and PTP) - Amlogic gxl MDIO mux - WiFi: - RealTek RTL8188EU (rtl8xxxu) - Qualcomm Wi-Fi 7 devices (ath12k) - CAN: - Renesas R-Car V4H Drivers: - Bluetooth: - Set Per Platform Antenna Gain (PPAG) for Intel controllers. - Ethernet NICs: - Intel (1G, igc): - support TSN / Qbv / packet scheduling features of i226 model - Intel (100G, ice): - use GNSS subsystem instead of TTY - multi-buffer XDP support - extend support for GPIO pins to E823 devices - nVidia/Mellanox: - update the shared buffer configuration on PFC commands - implement PTP adjphase function for HW offset control - TC support for Geneve and GRE with VF tunnel offload - more efficient crypto key management method - multi-port eswitch support - Netronome/Corigine: - add DCB IEEE support - support IPsec offloading for NFP3800 - Freescale/NXP (enetc): - support XDP_REDIRECT for XDP non-linear buffers - improve reconfig, avoid link flap and waiting for idle - support MAC Merge layer - Other NICs: - sfc/ef100: add basic devlink support for ef100 - ionic: rx_push mode operation (writing descriptors via MMIO) - bnxt: use the auxiliary bus abstraction for RDMA - r8169: disable ASPM and reset bus in case of tx timeout - cpsw: support QSGMII mode for J721e CPSW9G - cpts: support pulse-per-second output - ngbe: add an mdio bus driver - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing - r8152: handle devices with FW with NCM support - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation - virtio-net: support multi buffer XDP - virtio/vsock: replace virtio_vsock_pkt with sk_buff - tsnep: XDP support - Ethernet high-speed switches: - nVidia/Mellanox (mlxsw): - add support for latency TLV (in FW control messages) - Microchip (sparx5): - separate explicit and implicit traffic forwarding rules, make the implicit rules always active - add support for egress DSCP rewrite - IS0 VCAP support (Ingress Classification) - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS etc.) - ES2 VCAP support (Egress Access Control) - support for Per-Stream Filtering and Policing (802.1Q, 8.6.5.1) - Ethernet embedded switches: - Marvell (mv88e6xxx): - add MAB (port auth) offload support - enable PTP receive for mv88e6390 - NXP (ocelot): - support MAC Merge layer - support for the the vsc7512 internal copper phys - Microchip: - lan9303: convert to PHYLINK - lan966x: support TC flower filter statistics - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x - lan937x: support Credit Based Shaper configuration - ksz9477: support Energy Efficient Ethernet - other: - qca8k: convert to regmap read/write API, use bulk operations - rswitch: Improve TX timestamp accuracy - Intel WiFi (iwlwifi): - EHT (Wi-Fi 7) rate reporting - STEP equalizer support: transfer some STEP (connection to radio on platforms with integrated wifi) related parameters from the BIOS to the firmware. - Qualcomm 802.11ax WiFi (ath11k): - IPQ5018 support - Fine Timing Measurement (FTM) responder role support - channel 177 support - MediaTek WiFi (mt76): - per-PHY LED support - mt7996: EHT (Wi-Fi 7) support - Wireless Ethernet Dispatch (WED) reset support - switch to using page pool allocator - RealTek WiFi (rtw89): - support new version of Bluetooth co-existance - Mobile: - rmnet: support TX aggregation" * tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits) page_pool: add a comment explaining the fragment counter usage net: ethtool: fix __ethtool_dev_mm_supported() implementation ethtool: pse-pd: Fix double word in comments xsk: add linux/vmalloc.h to xsk.c sefltests: netdevsim: wait for devlink instance after netns removal selftest: fib_tests: Always cleanup before exit net/mlx5e: Align IPsec ASO result memory to be as required by hardware net/mlx5e: TC, Set CT miss to the specific ct action instance net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG net/mlx5: Refactor tc miss handling to a single function net/mlx5: Kconfig: Make tc offload depend on tc skb extension net/sched: flower: Support hardware miss to tc action net/sched: flower: Move filter handle initialization earlier net/sched: cls_api: Support hardware miss to tc action net/sched: Rename user cookie and act cookie sfc: fix builds without CONFIG_RTC_LIB sfc: clean up some inconsistent indentings net/mlx4_en: Introduce flexible array to silence overflow warning net: lan966x: Fix possible deadlock inside PTP net/ulp: Remove redundant ->clone() test in inet_clone_ulp(). ...
Diffstat (limited to 'drivers/input/touchscreen/wm9713.c')
-rw-r--r--drivers/input/touchscreen/wm9713.c476
1 files changed, 476 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/wm9713.c b/drivers/input/touchscreen/wm9713.c
new file mode 100644
index 000000000..a67fbe304
--- /dev/null
+++ b/drivers/input/touchscreen/wm9713.c
@@ -0,0 +1,476 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * wm9713.c -- Codec touch driver for Wolfson WM9713 AC97 Codec.
+ *
+ * Copyright 2003, 2004, 2005, 2006, 2007, 2008 Wolfson Microelectronics PLC.
+ * Author: Liam Girdwood <lrg@slimlogic.co.uk>
+ * Parts Copyright : Ian Molton <spyro@f2s.com>
+ * Andrew Zabolotny <zap@homelink.ru>
+ * Russell King <rmk@arm.linux.org.uk>
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/kernel.h>
+#include <linux/input.h>
+#include <linux/delay.h>
+#include <linux/bitops.h>
+#include <linux/wm97xx.h>
+
+#define TS_NAME "wm97xx"
+#define WM9713_VERSION "1.00"
+#define DEFAULT_PRESSURE 0xb0c0
+
+/*
+ * Module parameters
+ */
+
+/*
+ * Set internal pull up for pen detect.
+ *
+ * Pull up is in the range 1.02k (least sensitive) to 64k (most sensitive)
+ * i.e. pull up resistance = 64k Ohms / rpu.
+ *
+ * Adjust this value if you are having problems with pen detect not
+ * detecting any down event.
+ */
+static int rpu = 8;
+module_param(rpu, int, 0);
+MODULE_PARM_DESC(rpu, "Set internal pull up resistor for pen detect.");
+
+/*
+ * Set current used for pressure measurement.
+ *
+ * Set pil = 2 to use 400uA
+ * pil = 1 to use 200uA and
+ * pil = 0 to disable pressure measurement.
+ *
+ * This is used to increase the range of values returned by the adc
+ * when measureing touchpanel pressure.
+ */
+static int pil;
+module_param(pil, int, 0);
+MODULE_PARM_DESC(pil, "Set current used for pressure measurement.");
+
+/*
+ * Set threshold for pressure measurement.
+ *
+ * Pen down pressure below threshold is ignored.
+ */
+static int pressure = DEFAULT_PRESSURE & 0xfff;
+module_param(pressure, int, 0);
+MODULE_PARM_DESC(pressure, "Set threshold for pressure measurement.");
+
+/*
+ * Set adc sample delay.
+ *
+ * For accurate touchpanel measurements, some settling time may be
+ * required between the switch matrix applying a voltage across the
+ * touchpanel plate and the ADC sampling the signal.
+ *
+ * This delay can be set by setting delay = n, where n is the array
+ * position of the delay in the array delay_table below.
+ * Long delays > 1ms are supported for completeness, but are not
+ * recommended.
+ */
+static int delay = 4;
+module_param(delay, int, 0);
+MODULE_PARM_DESC(delay, "Set adc sample delay.");
+
+/*
+ * Set five_wire = 1 to use a 5 wire touchscreen.
+ *
+ * NOTE: Five wire mode does not allow for readback of pressure.
+ */
+static int five_wire;
+module_param(five_wire, int, 0);
+MODULE_PARM_DESC(five_wire, "Set to '1' to use 5-wire touchscreen.");
+
+/*
+ * Set adc mask function.
+ *
+ * Sources of glitch noise, such as signals driving an LCD display, may feed
+ * through to the touch screen plates and affect measurement accuracy. In
+ * order to minimise this, a signal may be applied to the MASK pin to delay or
+ * synchronise the sampling.
+ *
+ * 0 = No delay or sync
+ * 1 = High on pin stops conversions
+ * 2 = Edge triggered, edge on pin delays conversion by delay param (above)
+ * 3 = Edge triggered, edge on pin starts conversion after delay param
+ */
+static int mask;
+module_param(mask, int, 0);
+MODULE_PARM_DESC(mask, "Set adc mask function.");
+
+/*
+ * Coordinate Polling Enable.
+ *
+ * Set to 1 to enable coordinate polling. e.g. x,y[,p] is sampled together
+ * for every poll.
+ */
+static int coord;
+module_param(coord, int, 0);
+MODULE_PARM_DESC(coord, "Polling coordinate mode");
+
+/*
+ * ADC sample delay times in uS
+ */
+static const int delay_table[] = {
+ 21, /* 1 AC97 Link frames */
+ 42, /* 2 */
+ 84, /* 4 */
+ 167, /* 8 */
+ 333, /* 16 */
+ 667, /* 32 */
+ 1000, /* 48 */
+ 1333, /* 64 */
+ 2000, /* 96 */
+ 2667, /* 128 */
+ 3333, /* 160 */
+ 4000, /* 192 */
+ 4667, /* 224 */
+ 5333, /* 256 */
+ 6000, /* 288 */
+ 0 /* No delay, switch matrix always on */
+};
+
+/*
+ * Delay after issuing a POLL command.
+ *
+ * The delay is 3 AC97 link frames + the touchpanel settling delay
+ */
+static inline void poll_delay(int d)
+{
+ udelay(3 * AC97_LINK_FRAME + delay_table[d]);
+}
+
+/*
+ * set up the physical settings of the WM9713
+ */
+static void wm9713_phy_init(struct wm97xx *wm)
+{
+ u16 dig1 = 0, dig2, dig3;
+
+ /* default values */
+ dig2 = WM97XX_DELAY(4) | WM97XX_SLT(5);
+ dig3 = WM9712_RPU(1);
+
+ /* rpu */
+ if (rpu) {
+ dig3 &= 0xffc0;
+ dig3 |= WM9712_RPU(rpu);
+ dev_info(wm->dev, "setting pen detect pull-up to %d Ohms\n",
+ 64000 / rpu);
+ }
+
+ /* Five wire panel? */
+ if (five_wire) {
+ dig3 |= WM9713_45W;
+ dev_info(wm->dev, "setting 5-wire touchscreen mode.");
+
+ if (pil) {
+ dev_warn(wm->dev,
+ "Pressure measurement not supported in 5 "
+ "wire mode, disabling\n");
+ pil = 0;
+ }
+ }
+
+ /* touchpanel pressure */
+ if (pil == 2) {
+ dig3 |= WM9712_PIL;
+ dev_info(wm->dev,
+ "setting pressure measurement current to 400uA.");
+ } else if (pil)
+ dev_info(wm->dev,
+ "setting pressure measurement current to 200uA.");
+ if (!pil)
+ pressure = 0;
+
+ /* sample settling delay */
+ if (delay < 0 || delay > 15) {
+ dev_info(wm->dev, "supplied delay out of range.");
+ delay = 4;
+ dev_info(wm->dev, "setting adc sample delay to %d u Secs.",
+ delay_table[delay]);
+ }
+ dig2 &= 0xff0f;
+ dig2 |= WM97XX_DELAY(delay);
+
+ /* mask */
+ dig3 |= ((mask & 0x3) << 4);
+ if (coord)
+ dig3 |= WM9713_WAIT;
+
+ wm->misc = wm97xx_reg_read(wm, 0x5a);
+
+ wm97xx_reg_write(wm, AC97_WM9713_DIG1, dig1);
+ wm97xx_reg_write(wm, AC97_WM9713_DIG2, dig2);
+ wm97xx_reg_write(wm, AC97_WM9713_DIG3, dig3);
+ wm97xx_reg_write(wm, AC97_GPIO_STICKY, 0x0);
+}
+
+static void wm9713_dig_enable(struct wm97xx *wm, int enable)
+{
+ u16 val;
+
+ if (enable) {
+ val = wm97xx_reg_read(wm, AC97_EXTENDED_MID);
+ wm97xx_reg_write(wm, AC97_EXTENDED_MID, val & 0x7fff);
+ wm97xx_reg_write(wm, AC97_WM9713_DIG3, wm->dig[2] |
+ WM97XX_PRP_DET_DIG);
+ wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD); /* dummy read */
+ } else {
+ wm97xx_reg_write(wm, AC97_WM9713_DIG3, wm->dig[2] &
+ ~WM97XX_PRP_DET_DIG);
+ val = wm97xx_reg_read(wm, AC97_EXTENDED_MID);
+ wm97xx_reg_write(wm, AC97_EXTENDED_MID, val | 0x8000);
+ }
+}
+
+static void wm9713_dig_restore(struct wm97xx *wm)
+{
+ wm97xx_reg_write(wm, AC97_WM9713_DIG1, wm->dig_save[0]);
+ wm97xx_reg_write(wm, AC97_WM9713_DIG2, wm->dig_save[1]);
+ wm97xx_reg_write(wm, AC97_WM9713_DIG3, wm->dig_save[2]);
+}
+
+static void wm9713_aux_prepare(struct wm97xx *wm)
+{
+ memcpy(wm->dig_save, wm->dig, sizeof(wm->dig));
+ wm97xx_reg_write(wm, AC97_WM9713_DIG1, 0);
+ wm97xx_reg_write(wm, AC97_WM9713_DIG2, 0);
+ wm97xx_reg_write(wm, AC97_WM9713_DIG3, WM97XX_PRP_DET_DIG);
+}
+
+static inline int is_pden(struct wm97xx *wm)
+{
+ return wm->dig[2] & WM9713_PDEN;
+}
+
+/*
+ * Read a sample from the WM9713 adc in polling mode.
+ */
+static int wm9713_poll_sample(struct wm97xx *wm, int adcsel, int *sample)
+{
+ u16 dig1;
+ int timeout = 5 * delay;
+ bool wants_pen = adcsel & WM97XX_PEN_DOWN;
+
+ if (wants_pen && !wm->pen_probably_down) {
+ u16 data = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
+ if (!(data & WM97XX_PEN_DOWN))
+ return RC_PENUP;
+ wm->pen_probably_down = 1;
+ }
+
+ /* set up digitiser */
+ dig1 = wm97xx_reg_read(wm, AC97_WM9713_DIG1);
+ dig1 &= ~WM9713_ADCSEL_MASK;
+ /* WM97XX_ADCSEL_* channels need to be converted to WM9713 format */
+ dig1 |= 1 << ((adcsel & WM97XX_ADCSEL_MASK) >> 12);
+
+ if (wm->mach_ops && wm->mach_ops->pre_sample)
+ wm->mach_ops->pre_sample(adcsel);
+ wm97xx_reg_write(wm, AC97_WM9713_DIG1, dig1 | WM9713_POLL);
+
+ /* wait 3 AC97 time slots + delay for conversion */
+ poll_delay(delay);
+
+ /* wait for POLL to go low */
+ while ((wm97xx_reg_read(wm, AC97_WM9713_DIG1) & WM9713_POLL) &&
+ timeout) {
+ udelay(AC97_LINK_FRAME);
+ timeout--;
+ }
+
+ if (timeout <= 0) {
+ /* If PDEN is set, we can get a timeout when pen goes up */
+ if (is_pden(wm))
+ wm->pen_probably_down = 0;
+ else
+ dev_dbg(wm->dev, "adc sample timeout");
+ return RC_PENUP;
+ }
+
+ *sample = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
+ if (wm->mach_ops && wm->mach_ops->post_sample)
+ wm->mach_ops->post_sample(adcsel);
+
+ /* check we have correct sample */
+ if ((*sample ^ adcsel) & WM97XX_ADCSEL_MASK) {
+ dev_dbg(wm->dev, "adc wrong sample, wanted %x got %x",
+ adcsel & WM97XX_ADCSEL_MASK,
+ *sample & WM97XX_ADCSEL_MASK);
+ return RC_PENUP;
+ }
+
+ if (wants_pen && !(*sample & WM97XX_PEN_DOWN)) {
+ wm->pen_probably_down = 0;
+ return RC_PENUP;
+ }
+
+ return RC_VALID;
+}
+
+/*
+ * Read a coordinate from the WM9713 adc in polling mode.
+ */
+static int wm9713_poll_coord(struct wm97xx *wm, struct wm97xx_data *data)
+{
+ u16 dig1;
+ int timeout = 5 * delay;
+
+ if (!wm->pen_probably_down) {
+ u16 val = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
+ if (!(val & WM97XX_PEN_DOWN))
+ return RC_PENUP;
+ wm->pen_probably_down = 1;
+ }
+
+ /* set up digitiser */
+ dig1 = wm97xx_reg_read(wm, AC97_WM9713_DIG1);
+ dig1 &= ~WM9713_ADCSEL_MASK;
+ if (pil)
+ dig1 |= WM9713_ADCSEL_PRES;
+
+ if (wm->mach_ops && wm->mach_ops->pre_sample)
+ wm->mach_ops->pre_sample(WM97XX_ADCSEL_X | WM97XX_ADCSEL_Y);
+ wm97xx_reg_write(wm, AC97_WM9713_DIG1,
+ dig1 | WM9713_POLL | WM9713_COO);
+
+ /* wait 3 AC97 time slots + delay for conversion */
+ poll_delay(delay);
+ data->x = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
+ /* wait for POLL to go low */
+ while ((wm97xx_reg_read(wm, AC97_WM9713_DIG1) & WM9713_POLL)
+ && timeout) {
+ udelay(AC97_LINK_FRAME);
+ timeout--;
+ }
+
+ if (timeout <= 0) {
+ /* If PDEN is set, we can get a timeout when pen goes up */
+ if (is_pden(wm))
+ wm->pen_probably_down = 0;
+ else
+ dev_dbg(wm->dev, "adc sample timeout");
+ return RC_PENUP;
+ }
+
+ /* read back data */
+ data->y = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
+ if (pil)
+ data->p = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
+ else
+ data->p = DEFAULT_PRESSURE;
+
+ if (wm->mach_ops && wm->mach_ops->post_sample)
+ wm->mach_ops->post_sample(WM97XX_ADCSEL_X | WM97XX_ADCSEL_Y);
+
+ /* check we have correct sample */
+ if (!(data->x & WM97XX_ADCSEL_X) || !(data->y & WM97XX_ADCSEL_Y))
+ goto err;
+ if (pil && !(data->p & WM97XX_ADCSEL_PRES))
+ goto err;
+
+ if (!(data->x & WM97XX_PEN_DOWN) || !(data->y & WM97XX_PEN_DOWN)) {
+ wm->pen_probably_down = 0;
+ return RC_PENUP;
+ }
+ return RC_VALID;
+err:
+ return 0;
+}
+
+/*
+ * Sample the WM9713 touchscreen in polling mode
+ */
+static int wm9713_poll_touch(struct wm97xx *wm, struct wm97xx_data *data)
+{
+ int rc;
+
+ if (coord) {
+ rc = wm9713_poll_coord(wm, data);
+ if (rc != RC_VALID)
+ return rc;
+ } else {
+ rc = wm9713_poll_sample(wm, WM97XX_ADCSEL_X | WM97XX_PEN_DOWN, &data->x);
+ if (rc != RC_VALID)
+ return rc;
+ rc = wm9713_poll_sample(wm, WM97XX_ADCSEL_Y | WM97XX_PEN_DOWN, &data->y);
+ if (rc != RC_VALID)
+ return rc;
+ if (pil) {
+ rc = wm9713_poll_sample(wm, WM97XX_ADCSEL_PRES | WM97XX_PEN_DOWN,
+ &data->p);
+ if (rc != RC_VALID)
+ return rc;
+ } else
+ data->p = DEFAULT_PRESSURE;
+ }
+ return RC_VALID;
+}
+
+/*
+ * Enable WM9713 continuous mode, i.e. touch data is streamed across
+ * an AC97 slot
+ */
+static int wm9713_acc_enable(struct wm97xx *wm, int enable)
+{
+ u16 dig1, dig2, dig3;
+ int ret = 0;
+
+ dig1 = wm->dig[0];
+ dig2 = wm->dig[1];
+ dig3 = wm->dig[2];
+
+ if (enable) {
+ /* continuous mode */
+ if (wm->mach_ops->acc_startup &&
+ (ret = wm->mach_ops->acc_startup(wm)) < 0)
+ return ret;
+
+ dig1 &= ~WM9713_ADCSEL_MASK;
+ dig1 |= WM9713_CTC | WM9713_COO | WM9713_ADCSEL_X |
+ WM9713_ADCSEL_Y;
+ if (pil)
+ dig1 |= WM9713_ADCSEL_PRES;
+ dig2 &= ~(WM97XX_DELAY_MASK | WM97XX_SLT_MASK |
+ WM97XX_CM_RATE_MASK);
+ dig2 |= WM97XX_SLEN | WM97XX_DELAY(delay) |
+ WM97XX_SLT(wm->acc_slot) | WM97XX_RATE(wm->acc_rate);
+ dig3 |= WM9713_PDEN;
+ } else {
+ dig1 &= ~(WM9713_CTC | WM9713_COO);
+ dig2 &= ~WM97XX_SLEN;
+ dig3 &= ~WM9713_PDEN;
+ if (wm->mach_ops->acc_shutdown)
+ wm->mach_ops->acc_shutdown(wm);
+ }
+
+ wm97xx_reg_write(wm, AC97_WM9713_DIG1, dig1);
+ wm97xx_reg_write(wm, AC97_WM9713_DIG2, dig2);
+ wm97xx_reg_write(wm, AC97_WM9713_DIG3, dig3);
+
+ return ret;
+}
+
+struct wm97xx_codec_drv wm9713_codec = {
+ .id = WM9713_ID2,
+ .name = "wm9713",
+ .poll_sample = wm9713_poll_sample,
+ .poll_touch = wm9713_poll_touch,
+ .acc_enable = wm9713_acc_enable,
+ .phy_init = wm9713_phy_init,
+ .dig_enable = wm9713_dig_enable,
+ .dig_restore = wm9713_dig_restore,
+ .aux_prepare = wm9713_aux_prepare,
+};
+EXPORT_SYMBOL_GPL(wm9713_codec);
+
+/* Module information */
+MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>");
+MODULE_DESCRIPTION("WM9713 Touch Screen Driver");
+MODULE_LICENSE("GPL");